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Bengtsson, Tobias, i Håkan Hult. "Combining Solar Energy and UPS Systems". Thesis, KTH, Tillämpad termodynamik och kylteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-148042.
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Solar Power and Uninterruptible Power Supply (UPS) are two technologies that are growing rapidly. The demand for solar energy is mainly driven by the trend towards cheaper solar cells, making it economically profitable for a larger range of applications. However, solar power has yet to reach grid parity in many geographical areas, which makes ways to reduce the cost of solar power systems important. This thesis investigates the possibility and potential economic synergies of combining solar power with UPS systems, which have been previously researched only from a purely technical point of view. This thesis instead evaluates the hypothesis that a combined solar and UPS system might save additional costs compared to regular grid-tied systems, even in a stable power grid. The primary reason is that on-line UPS systems rectifies and inverts all electricity, which means that solar energy can be delivered to the DC part of the UPS system instead of an AC grid, avoiding the installation of additional inverters in the solar power system. The study is divided into three parts. The first part is a computer simulation using MATLAB, which has an explorative method and aims to simulate a combined system before experimenting physically with it. The second part consists of experiments on a physical prototype system based on basic UPS and solar power components. The third part is an economical assessment of investment costs and energy balances, comparing two separate systems (UPS and solar power separate) to one combined (UPS & solar power). The results from the prototype system show that adding solar power to an UPS system does not interfere with the UPS functionality in any major way, however for optimal performance some additional integration may be necessary. On the contrary, the additional power terminal that the solar panels constitute, can increase system performance during certain operational conditions. The result of the economic analysis shows that a combined system has potential for both a lower investment cost due to cheaper components and increased energy savings through lower conversion losses. The conclusion from the study is that a combined solar energy and UPS system is technically feasible. Furthermore, a combined system has clear economic advantages over two separate systems. This means that a combined system might be economically profitable even in situations where a separate system is not.Solenergi och avbrottsfri kraftförsörjning (UPS) är två tekniker som växer snabbt. Efterfrågan på solenergi ökar huvudsakligen på grund av den snabba utvecklingen mot billigare solceller, vilket lett till att solenergi blivit lönsamt i en större mängd applikationer. I många områden är solenergi dock fortfarande inte kostnadsmässigt konkurrenskraftigt jämfört med traditionella energikällor, vilket gör en fortsatt sänkning av kostnaderna för solenergi till en viktig fråga för solenergiindustrin. Detta examensarbete har som syfte att undersöka om det är tekniskt möjligt att kombinera solenergi med UPS-system samt potentialen för ekonomiska synergier med denna kombination. Tidigare forskning inom området har endast undersökt denna kombination från en rent teknisk synvinkel. Detta examensarbete driver istället hypotesen att ett kombinerat solenergi- och UPS-system kan leda till större kostnadsbesparingar jämfört med ett traditionellt nätanslutet solenergisystem, även i ett stabilt elnät som i Sverige. En on-line UPS skyddar en känslig last genom att kontinuerligt likrikta och sedan åter växelrikta inkommande ström för att därmed både isolera lasten från nätet samt höja strömkvalitén. I UPS-systemet finns därmed en likströmsdel dit solpanelerna direkt kan kopplas istället för att skicka den genererade solenergin ut på elnätet. Därmed undviks inköp och installation av sol-växelriktare i solenergisystemet. Studien är uppdelad i tre delar. Första delen är en datorsimulering i MATLAB och syftar till att explorativt undersöka det kombinerade systemet för en optimerad design innan fysiska experiment utförs. Den andra delen av studien utgörs av experiment på ett fysiskt prototypsystem baserat på ett principiellt UPS- och solenergisystem. Den tredje delen av studien är en ekonomisk analys av både investeringskostnader och energibalanser som jämför ett kombinerat system (UPS & sol) med två separata system (UPS & sol separat). Resultaten från prototypsystemet visar att påkopplandet av solceller i en principiell UPS har mycket låg påverkan på UPS-systemets funktionalitet, samt att solcellerna som en extra energikälla under vissa driftförhållanden kan ha en positiv påverkan på UPS-systemet. För optimal prestanda kan dock en viss integration av systemen krävas. Resultatet från den ekonomiska analysen visar att ett kombinerat system har potential att sänka investeringskostnaden genom billigare komponenter. Ett kombinerat system kan även leda till en högre energibesparing jämfört med ett nätanslutet solenergisystem eftersom konverteringsförlusterna i UPS-systemet sjunker i det kombinerade systemet. Slutsatsen av studierna är att ett kombinerat solenergi- och UPS-system är tekniskt möjligt. Dessutom finns betydande ekonomiska synergier med ett kombinerat system. Detta innebär att ett kombinerat system kan vara lönsamt även i fall där ett separat solelsystem inte är det.
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Dorn, Lawrence Tyrone. "NPS-SCAT electrical power system". Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep_Dorn.pdf.
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Thesis (M.S. in Space Systems Operations)--Naval Postgraduate School, September 2009.Thesis Advisor(s): Newman, James H. "September 2009." Description based on title screen as viewed on November 5, 2009. Author(s) subject terms: Satellite, CubeSat, NPS-SCAT, solar cell tester, Power system, Clyde Space, Spectrolabs, improved triple junction, solar power. Includes bibliographical references (p. 83-85). Also available in print.
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Jain, Chinmay. "Design, control and implementation of grid tied solar energy conversion systems". Thesis, IIT Delhi, 2017. http://localhost:8080/xmlui/handle/12345678/7058.
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Bafana, Ramzi, i Zain Zulfiqar. "Solar Energy". Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2079.
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This thesis is about Photovoltaic (PV) cells and its stresses in various directions by calculating the power generated using solar cells under different conditions to improve its efficiency. Our research studies found that using multi-junction cells with larger substrates can increase the efficiency to some extent which in practice is limited to 43 percent. The experiment was conducted using ten solar cells each with an area of 20.9〖cm〗 ^2, where each cell gives 0.5 V and 0.4 A and a 1.25 Ω resistor was used. The cells were connected in series. Once, the PV cells were fixed horizontally and the other time tested in tilted position under same outdoor condition. The purpose of testing PV cells was to investigate the efficiency under above mentioned conditions. The data collected from the readings was used in calculation, and we have obtained from the calculations that horizontally fixed cells gave 4.8 percent efficiency whereas tilted cells gave 6.6 percent efficiency. Hence, the ratio showed that fixed cells produced 37.5 percent more power compared to horizontally fixed cells. Our other experiment consisted of testing PV cells under different temperature conditions that was done using a freezer and an oven for temperature variation and a tungsten bulb was used as a light source. The purpose of performing this experiment was to investigate how the efficiency of PV cells is affected under extreme conditions. Part of our thesis was also including studies and analysis of produced energy by the solar panel installed on the roof of “BTH” building in Karlskrona, Sweden. The data consisted of energy produced from February up to August 2014. The investigation also included finding the highest produced energy during these months. We have found that the highest energy was generated on the 1st of July which was 12.86 kWh. Furthermore, we went deep into investigation of the 1st of July to know exactly which hour of that day the highest energy was produced. The data showed that the highest produced energy was at 12:19 and 13:19 which was 2.03 kWh.Ramzi: +46723231353, +966561993488 Zain:
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ZHANG, SHAN. "Analytical system for photovoltaic and concentratingsolar power generation". Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-16174.
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Energy is the material foundation of human survival and development. Throughout human industrialization process, the fossil energy has made tremendous contributions in the progress of human civilization, economic and social development. For a long time, the development of human energy use patterns makes fossil fuels rapidly depleted and the consequences of environmental deterioration by this pattern lead to the severe challenge for mankind. Many countries start paying more attention to develop the new energy. The solar electricity production system is one of the main new energy power generations. The thesis is a guide of principle for solar power generation system. It focuses on comparisons between photovoltaic and concentrating solar power generations and analysis of their market prospects. The merits and demerits of these two systems will also be pointed out in this thesis.
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Guoan, Christopher M. "Ground-based high energy power beaming in support of spacecraft power requirements". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Jun%5FGuoan.pdf.
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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, June 2006.Thesis Advisor(s): Sherif Michaels. "June 2006." Includes bibliographical references (p. 119-124). Also available in print.
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Bialobrzeski, Robert Wetherill. "Optimization of a SEGS solar field for cost effective power output". Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/24631.
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Chen, Zhi Yuan. "Efficient power management design for energy harvesting biomedical applications". Thesis, University of Macau, 2018. http://umaclib3.umac.mo/record=b3952096.
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Broders, Adam C. "Combining of renewable energy plants to improve energy production stability". Worcester, Mass. : Worcester Polytechnic Institute, 2008. http://www.wpi.edu/Pubs/ETD/Available/etd-042908-132847/.
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Pierce, Warrick Tait. "Solar assisted power generation (SAPG) : investigation of solar preheating of feedwater". Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80139.
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Thesis (MEng)--Stellenbosch University, 2013.ENGLISH ABSTRACT: Solar Assisted Power Generation (SAPG) can be seen as a synergy of solar and fossil plants – combining the environmental benefits of the former and the scale, efficiency and reliability of the latter. SAPG offers great potential for cost effective utilization of solar energy on utility scale and could accelerate the adoption of solar thermal energy technologies in the short and medium term, especially in countries with a significant coal base and a good solar resource such as Australia, China, United States, India and South Africa. SAPG is the replacement of bled-off steam in a Regenerative Rankine power cycle. Power plant simulations were performed using weather data for Lephalale, South Africa (Matimba power station). With an increase in the solar field outlet temperature, an increase in overall solar to electric efficiency was observed, superior to a stand-alone Solar Thermal Power Plant(s) (STPP) at similar temperatures. The performance of four solar collector technologies was compared: flat plate, evacuated tube, Linear Fresnel (LF) and Parabolic Trough (PT). This comparison was limited to the normal incidence angles of irradiation. For this application, nonconcentrating technologies are not competitive. For non-normal incidence angles, annual simulations were limited to PT and LF at final feedwater heater temperatures. The actual aperture area of around 80 000 m2 was used (50 MW thermal based on LF). On an equal aperture area basis, PT outperforms LF significantly. For the conventional North-South arrangement, LF needs to be around 53% of the specific installation cost (in $/m2 aperture area) of PT to be cost competitive. A SAPG plant at Lephalale was compared to a stand-alone Solar Thermal Power Plant STPP in a good solar resource area, namely Upington, South Africa – Parabolic Trough solar collector fields of equal size were considered for both configurations. It was found that the annual electricity generated with a SAPG plant is more than 25% greater than a stand-alone STPP. If the cost of SAPG is taken as 72% of the cost of a stand-alone STPP, this translates into SAPG being 1.8 times more cost effective than stand-alone STPP. Furthermore, SAPG performs better in high electricity demand months (South African winter – May to August). Stand-alone STPP have been adopted in South Africa and are currently being built. This was achieved by the government creating an attractive environment for Independent Power Producers (IPP). Eskom, the national power supplier, is currently investigating solar boosting at existing Eskom sites. This report argues that on a national level, SAPG, specifically solar preheating of feedwater, is a more viable solution for South Africa, with both its significant coal base and good solar resource.
AFRIKAANSE OPSOMMING: Son ondersteunde krag generasie (SOKG) kan gesien word as sinergie van sonkrag en fossiele brandstof aanlegte – dit voeg die omgewings voordele van die eersgenoemde en die grote, effektiwiteit en betroubaarheid van die laasgenoemde by mekaar. SOKG opper groot potensiaal vir koste effektiewe gebruik van son energie op nutsmaatskappyskaal en kan die aanvaarding van sontermiese energietegnologieë in die kort en medium termyn versnel, veral in lande met beduidende kool reserwes en goeie sonkrag voorkoms soos Australië, China, Verenigde State van Amerika, Indië en Suid-Afrika. SOKG impliseer die vervanging van aftap stoom in die regeneratiewe Rankine krag kringloop. Kragstasie simulasies was gedoen met die gebruik van weer data van Lephalale, Suid-Afrika (Matimba kragstasie). Met die toename van die sonveld uitlaat temperatuur kon oorhoofse son-na-elektrisiteit effektiwiteit vasgestel word, wat hoër is as die van alleenstaande sontermiese krag stasie (STKS) by soortgelyke temperature. Die effektiwiteit van vier son kollekteerder tegnologieë was vergelyk: plat plaat, vakuum buis, lineêre Fresnel (LF) en paraboliese trog (PT). Die vergelyking was beperk tot normale inval van bestraling. Vir hierdie toepassing is nie-konsentreerende tegnologie nie mededingend nie. Vir nie-normale inval hoeke was jaarlange simulasies beperk tot PT en LF by finale voedingswater temperatuur. Die werklike opening area van omtrent 80 000 m2 was gebruik (50 MW termies gebaseer op LF). By gelyke opening area, uitpresteer PT LF beduidend. Vir die gebruiklike Noord-Suid rankskikking benodig LF omtrent 53% van die spesifieke installasie kostes (in $/m2 opening area) van PT om kostes mededingend te kan wees. ‘n SOKG aanleg by Lephalale was vergelyk met alleenstaande STKS in die goeie son voorkoms gebied van Upington, Suid-Afrika – Paraboliese trog kollekteerder velde van gelyke grote was oorweeg vir al twee konfigurasies. Dit was gevind dat die jaarlikse elektrisiteit gegenereer vanaf SOKG meer as 25% is as die van alleenstaande STKS. Indien SOKG oorweeg word met 72% van die kostes van alleenstaande STKS, dan beteken dit dat SOKG 1.8 keer meer koste effektief is as alleenstade STKS. Verder, SOKG presteer beter in die hoer elektrisiteitsnavraag maande (Suid- Afrikaanse winter – May tot Augustus). Alleenstaande STKS is gekies vir Suid-Afrika en word tans gebou. Dit is bereik deur dat die regering ‘n aantreklike omgewing geskep het vir onafhanglike krag produsente. Eskom ondersoek tans SOKG by bestaande Eskom persele. Hierdie verslag beweer dat op nasionale/Eskom vlak, SOKG, besonders son voorverhitting van voedingswater, meer haalbare oplossing is vir Suid-Afrika met sy beduidende koolreserwes en goeie son voorkoms.
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Baziotopoulos, Con, i mikewood@deakin edu au. "Utilising solar energy within conventional coal fired power stations". Deakin University. School of Engineering and Technology, 2002. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20060817.145445.
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Although the thermodynamic advantages of using solar energy to replace the bled off steam in the regeneration system of Rankine cycle coal fired power stations has been proven theoretically, the practical techno/economic feasibility of the concept has yet to be confirmed relative to real power station applications. To investigate this concept further, computer modelling software THERMSOLV was specifically developed for this project at Deakin University, together with the support of the Victorian power industry and Australian Research Council (ARC). This newly developed software simulates the steam cycle to assess the techno/economic merit of the solar aided concept for various power station structures, locations and local electricity market conditions. Two case studies, one in Victoria Australia and one in Yunnan Province, China, have been carried out with the software. Chapter one of this thesis defines the aims and scope of this study. Chapter two details the literature search in the related areas for this study. The thermodynamic concept of solar aid power generation technology has been described in chapter three. In addition, thermodynamic analysis i.e. exergy/availability has been described in this chapter. The Thermosolv software developed in this study is detailed in chapter four with its structure, functions and operation manual included. In chapter five the outcomes of two case studies using the Thermosolv software are presented, with discussions and conclusions about the study in chapters 6 and 7 respectfully. The relevant recommendations are then made in chapter eight.
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Bombelli, Paolo. "Harnessing solar energy by bio-photovoltaic devices". Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610451.
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Kim, Byungyu. "Solar Energy Generation Forecasting and Power Output Optimization of Utility Scale Solar Field". DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2149.
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The optimization of photovoltaic (PV) power generation system requires an accurate system performance model capable of validating the PV system optimization design. Currently, many commercial PV system modeling programs are available, but those programs are not able to model PV systems on a distorted ground level. Furthermore, they were not designed to optimize PV systems that are already installed. To solve these types of problems, this thesis proposes an optimization method using model simulations and a MATLAB-based PV system performance model. The optimization method is particularly designed to address partial shading issues often encountered in PV system installed on distorted ground. The MATLAB-based model was validated using the data collected from the Cal Poly Gold Tree Solar Field. It was able to predict the system performance with 96.4 to 99.6 percent accuracy. The optimization method utilizes the backtracking algorithm already installed in the system and the pitch distance to control the angle of the tracker and reduces solar panels partial shading on the adjacent row to improve system output. With pitch distances reduced in the backtracking algorithm between 2.5 meters and 3 meters, the inverter with inter-row shading can expect a 10.4 percent to 28.9 percent increase in power production. The implementation and calibration of this optimization method in the field this spring was delayed due to COVID-19. The field implementation is now expected to start this summer.
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Oggioni, Niccolò. "Modelling of microgrid energy systems with concentrated solar power". Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264345.
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This master’s thesis presents the work performed during a four-month long internship at Azelio AB in Gothenburg. Energy performance models for common energy technologies in microgrid energy systems were developed and validated. The investigated technologies are traditional and bifacial PV modules, wind turbines, Li-ion battery energy storage systems and diesel generators. Subsequently, they were utilised to simulate the energy supply of two remote communities in Queensland, Australia. Azelio’s CSP technology, which combines heliostats, thermal energy storage with phase change materials and Stirling engine, was introduced as well. By means of scenarios and key performance indicators, the possibility of disconnecting such towns from the local electricity distribution network was investigated. Both technical and economic aspects were analysed. This led to the conclusion that 10 MW CSP system would be sufficient to achieve grid independence if extra backup capacity, e.g. diesel generators, or demandside control strategies, are introduced. Sensitivity analysis performed on the possibility of dividing the CSP park into two clusters, the smaller one being subject to a power threshold, was investigated as well. In terms of economic feasibility, off-grid systems resulted more expensive than maintaining the grid connection.Denna master’s uppsats presenterar alla resultat från examensarbetet hos Azelio AB i Göteborg. Energy performance models för de vanligaste energiteknologerna i microgrid energisystemen designades och validerades. De forskade energiteknologerna var traditionella och bifacial solpaneler, vindkraft, energilagring genom Liion batterier och dieselgeneratorer. Modellerna användes för att simulera energiförsörjning av olika energisystem som representerar två isolerade byar i Queensland, Australia. Azelio’s CSP teknologi, som består av heliostater, värmenergilagring med phase change material och en Stirlingmotor, introducerades också. Genom att designa olika scenarier och key perfomance indicators, möjligheten att koppla av byarna ifrån det lokala kraftnätsystemet utforskades. Båda tekniska och ekonomiska synpunkter värderades. Det beslutades att 10 MW CSP kapacitet kan vara nog mycket för att nå energisjälvständighet om ytterligare backupkapacitet, t.ex. en dieselgenerator, eller demand side control strategies introducerades. Känslighetsanalys utforskade möjligheten att dela CSP systemet i två olika delar, där den med lägre kapacitet kunde avkopplas för att undvika onödig energiförsörjning. Om ekonomiska utförbarhet, off-grid system verkade dyrare än sådana system där byarna var fortfarande kopplat till det lokala kraftnätet.
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Kamanzi, Janvier. "Thermal electric solar power conversion panel development". Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2527.
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Thesis (DTech (Engineering))--Cape Peninsula University of Technology, 2017.The world has been experiencing energy-related problems following pressuring energy demands which go along with the global economy growth. These problems can be phrased in three paradoxical statements: Firstly, in spite of a massive and costless solar energy, global unprecedented energy crisis has prevailed, resulting in skyrocketing costs. Secondly, though the sun releases a clean energy, yet conventional plants are mainly being run on unclean energy sources despite their part in the climate changes and global warming. Thirdly, while a negligible percentage of the solar energy is used for power generation purposes, it is not optimally exploited since more than its half is wasted in the form of heat which contributes to lowering efficiency of solar cells and causes their premature degradation and anticipated ageing. The research is geared at addressing the issue related to unsatisfactory efficiencies and anticipated ageing of solar modules. The methodology adopted to achieve the research aim consisted of a literature survey which in turn inspired the devising of a high-efficiency novel thermal electric solar power panel. Through an in-depth overview, the literature survey outlined the rationale of the research interest, factors affecting the performance of PVs as well as existing strategies towards addressing spotted shortcomings. While photovoltaic (PV) panels could be identified as the most reliable platform for sunlight-to-electricity conversion, they exhibit a shortcoming in terms of following the sun so as to maximize exposure to sunlight which negatively affects PVs’ efficiencies in one hand. On the other hand, the inability of solar cells to reflect the unusable heat energy present in the sunlight poses as a lifespan threat. Strategies and techniques in place to track the sun and keep PVs in nominal operational temperatures were therefore reviewed.
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Ray, Mike C. T. "Solar Data Analysis". PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1078.
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The solar industry has grown considerably in the last few years. This larger scale has introduced more problems as well as possibilities. One of those possibilities is analyzing the data coming from the sites that are now being monitored, and using the information to answer a variety of questions.
We have four questions which are of prime importance identified in this thesis:
1. Can data from customers be trusted?
2. Can we use data from existing sites to determine which sites need the most improvement?
3. Can we implement a location-based algorithm to reduce the amount of false positives for performance, or other alarms?
4. Can we improve upon the current predicted power algorithm?
We find that not only can we answer these questions definitively, but the improvements found are of significant value. Each of these items represents an important question that either directly or indirectly translates into increased revenue and engineering improvements for the solar industry as a whole.
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Wallentinsson, Måns, Clara Grönlund, Linus Rustas i Emil Forsén. "Potential solar power installations within the municipality of Uppsala". Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-359770.
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Uppsala municipality has ambitions to reduce greenhouse gas emissions by installing solar power. To do this, the municipality has set a goal to install 30 MWp of solar power by the year 2020, and today 25 MWp has yet to be installed. The objective of this study is to investigate if Uppsala municipality is able to install 25 MWp solar power on municipality owned buildings or if an additional solar park installation is required. This is done through simulations and calculations and results are visualized in QGIS, a geographical information system software. The conclusion of this study is that Uppsala municipality will need a solar park at a magnitude of 0.9 MWp and rooftop installations of 24.1 MWp to reach the goal of 30 MWp. The cost of this installation would be 296 MSEK. The GIS-layers illustrates municipality owned rooftops suitable for solar power installation and module installation proposals. A sensitivity analysis is performed were the type of module is changed, which in turn affects efficiency and module angles. The outcome of the sensitivity analysis is that the type of module and the module efficiency are important parameters that affect the result. Depending on how valuable the land area is, higher module efficiency could be advantageous. Future work could involve an investigation about which type of PV technology that best satisfies Uppsala municipality’s priorities.
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Darwish, Mazen. "Modular Hybridization of Solar Thermal Power Plants For Developing Nations". Thesis, KTH, Kraft- och värmeteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104456.
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The current energy scenario in the developing nations with abundant sun resource (e.g. southern Mediterranean countries of Europe, Middle-East & North Africa) relies mainly on fossil fuels to supply the increasing energy demand. Although this long adopted pattern ensures electricity availability on demand at all times through the least cost proven technology, it is highly unsustainable due to its drastic impacts on depletion of resources, environmental emissions and electricity prices. Solar thermal Hybrid power plants among all other renewable energy technologies have the potential of replacing the central utility model of conventional power plants, the understood integration of solar thermal technologies into existing conventional power plants shows the opportunity of combining low cost reliable power and Carbon emission reduction. A literature review on the current concentrating solar power (CSP) technologies and their suitability for integration into conventional power cycles was concluded, the best option was found be in the so called Integrated solar combined cycle systems (ISCCS); the plant is built and operated like a normal combined cycle, with a solar circuit consisting of central tower receiver and heliostat field adding heat to the bottoming Rankine cycle. A complete model of the cycle was developed in TRNSYS simulation software and Matlab environment, yearly satellite solar insolation data was used to study the effect of integrating solar power to the cycle throw-out the year. A multi objective thermo economic optimization analysis was conducted in order to identify a set of optimum design options. The optimization has shown that the efficiency of the combined cycle can be increased resulting in a Levelized electricity cost in the range of 10 -14 USDcts /Kwhe. The limit of annual solar share realized was found to be around 7 % The results of the study indicate that ISCCS offers advantages of higher efficiency, low cost reliable power and on the same time sends a green message by reducing the environmental impacts in our existing power plant systems.
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Yazıcı, Osman Can Subaşılar Bedrettin. "Theoretical modeling and designing a line-focused horizontal -receiver- solar thermal power plant/". [s.l.]: [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/enerjimuh/T000411.pdf.
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Thesis (Master)--İzmir Institute of Technology, İzmir, 2005Keywords: Solar energy plant, solar collectors, fresnel lens, spherical geometry, solar tracking system. Includes bibliographical references (leaves 113-114).
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Rudd, Timothy Robert. "BENEFITS OF NEAR-TERM CLOUD LOCATION FORECASTING FOR LARGE SOLAR PV". DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/597.
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As the ‘green’ energy movement continues to gain momentum, photovoltaic generation is becoming an increasingly popular source for new power generation. The primary focus of this paper is to demonstrate the benefits of close-to real-time cloud sensing for Photovoltaic generation. In order to benefit from this close-to real-time data, a source of cloud cover information is necessary. This paper looks into the potential of point insolation sensors to determine overhead cloud coverage. A look into design considerations and economic challenges of implementing such a monitoring system is included. The benefits of cloud location sensing are examined using computer simulations to target important time-scales and options available to plant operators. Finally, the economics of advanced forecasting options will be examined in order to determine the benefit to plant operators.
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Nithyanandam, Karthik. "Investigations on Latent Thermal Energy Storage for Concentrating Solar Power". Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23189.
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Thermal energy storage (TES) in a concentrating solar power (CSP) plant allows for continuous operation even during times when solar radiation is not available, thus providing a reliable output to the grid. Energy can be stored either as sensible heat or latent heat, of which latent heat storage is advantageous due to its high volumetric energy density and the high Rankine cycle efficiency owing to the isothermal operation of latent thermal energy storage (LTES) system. Storing heat in the form of latent heat of fusion of a phase change material (PCM), in addition to sensible heat, significantly increases the energy density, thus potentially reducing the storage size and cost. However, a major technical barrier to the use of latent thermal energy of PCM is the high thermal resistance to energy transfer due to the intrinsically low thermal conductivity of PCMs, which is a particularly acute constraint during the energy discharge. Secondly, for integration of TES in CSP plants, it is imperative that the cyclic exergetic efficiency be high, among other requirements, to ensure that the energy extracted from the system is at the maximum possible temperature to achieve higher cycle conversion efficiency in the power block.
The first objective is addressed through computational modeling and simulation to quantify the effectiveness of two different approaches to reduce the thermal resistance of PCM in a LTES, viz. (a) developing innovative, inexpensive and passive heat transfer devices that efficiently transfer large amount of energy between the PCM and heat transfer fluid (HTF) and (b) increase the heat transfer area of interaction between the HTF and PCM by incorporating the PCM mixture in small capsules using suitable encapsulation techniques.
The second portion of the research focuses on numerical modeling of large scale latent thermal storage systems integrated to a CSP plant with the aforementioned enhancement techniques and cascaded with more than one PCM to maximize the exergetic efficiency. Based on systematic parametric analysis on the various performance metrics of the two types of LTES, feasible operating regimes and design parameters are identified to meet the U.S. Department of Energy SunShot Initiative requirements including storage cost < $15/kWht and exergetic efficiency > 95%, for a minimum storage capacity of 14 h, in order to reduce subsidy-free levelized cost of electricity (LCE) of CSP plants from 21¢/kWh (2010 baseline) to 6¢/kWh, to be on par with the LCE associated with fossil fuel plants.Ph. D.
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D, Pepe. "New techniques for solar power forecasting and building energy management". Doctoral thesis, Università di Siena, 2019. http://hdl.handle.net/11365/1072873.
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The electrical grid can no longer be considered a unidirectional means of distributing energy from conventional plants to the final users, but a Smart Grid, where strong interaction between producers and users takes place. In this context, the importance of independent renewable generation is constantly increasing, and new tools are needed in order to reliably manage conventional power plant operation, grid balancing, real-time unit dispatching, demand constraints and energy market requirements. This dissertation is focused on two aspects of this general problem: cost-optimal management of smart buildings in a Demand-Response framework, and estimation of photovoltaic generation forecasting models.
In the first part of this thesis a novel Model Predictive Control approach for integrated management of HVAC, electrical and thermal storage, and photovoltaic generation in building is presented. The proposed methodology also considers participation of the building in a Demand-Response program, which allows the consumer to become an active player in the electricity system. The related optimization problems turn out to be computationally appealing, even uncertainty sources is also addressed by means of a two-step procedure.
The second part deals with the problem of estimating photovoltaic generation forecasting models in scenarios where measurements of meteorological variables (i.e., solar irradiance and temperature) at the plant site are not available. This scenario is relevant to electricity network operation, when a large number of photovoltaic plants are deployed in the grid. In particular, two methods have been developed. The first approach makes use of raw cloud cover data provided by a weather service combined with power generation measurements to estimate the parameters of a novel class of models. The second approach is based on a set of tests performed on the generated power time series aimed at detecting data portions that were generated under clear sky conditions. These data are then used for fit the parameters of the PVUSA
model to the theoretical clear sky irradiance. All the methods covered in this thesis have been extensively validated either using industry-standard simulation frameworks or via experiments performed on real data.
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Rallis, Evan. "Solar and Wind Energy Development in Maine: 1973-1997". Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/RallisE2003.pdf.
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Strand, Anna. "Optimization of energy dispatch in concentrated solar power systems : Design of dispatch algorithm in concentrated solar power tower system with thermal energy storage for maximized operational revenue". Thesis, KTH, Kraft- och värmeteknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264410.
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Concentrated solar power (CSP) is a fast-growing technology for electricity production. With mirrors (heliostats) irradiation of the sun is concentrated onto a receiver run through by a heat transfer fluid (HTF). The fluid by that reaches high temperatures and is used to drive a steam turbine for electricity production. A CSP power plant is most often coupled with an energy storage unit, where the HTF is stored before it is dispatched and used to generate electricity. Electricity is most often sold at an open market with a fluctuating spot-prices. It is therefore of high importance to generate and sell the electricity at the highest paid hours, increasingly important also since the governmental support mechanisms aimed to support renewable energy production is faded out since the technology is starting to be seen as mature enough to compete by itself on the market. A solar power plant thus has an operational protocol determining when energy is dispatched, and electricity is sold. These protocols are often pre-defined which means an optimal production is not achieved since irradiation and electricity selling price vary. In this master thesis, an optimization algorithm for electricity sales is designed (in MATLAB). The optimization algorithm is designed by for a given timeframe solve an optimization problem where the objective is maximized revenue from electricity sales from the solar power plant. The function takes into consideration hourly varying electricity spot price, hourly varying solar field efficiency, energy flows in the solar power plant, start-up costs (from on to off) plus conditions for the logic governing the operational modes. Two regular pre-defined protocols were designed to be able to compare performance in a solar power plant with the optimized dispatch protocol. These three operational protocols were evaluated in three different markets; one with fluctuating spot price, one regulated market of three fixed price levels and one in spot market but with zero-prices during sunny hours. It was found that the optimized dispatch protocol gave both bigger electricity production and revenue in all markets, but with biggest differences in the spot markets. To evaluate in what type of powerplant the optimizer performs best, a parametric analysis was made where size of storage and power block, the time-horizon of optimizer and the cost of start-up were varied. For size of storage and power block it was found that revenue increased with increased size, but only up to the level where the optimizer can dispatch at optimal hours. After that there is no increase in revenue. Increased time horizon gives increased revenue since it then has more information. With a 24-hour time horizon, morning price-peaks will be missed for example. To change start-up costs makes the power plant less flexible and with fewer cycles, without affect income much.Koncentrerad solkraft (CSP) är en snabbt växande teknologi för elektricitets-produktion. Med speglar (heliostater) koncentreras solstrålar på en mottagare som genomflödas av en värmetransporteringsvätska. Denna uppnår därmed höga temperaturer vilket används för att driva en ångturbin för att generera el. Ett CSP kraftverk är oftast kopplat till en energilagringstank, där värmelagringsvätskan lagras innan den används för att generera el. El säljs i de flesta fall på en öppen elmarknad, där spotpriset fluktuerar. Det är därför av stor vikt att generera elen och sälja den vid de timmar med högst elpris, vilket också är av ökande betydelse då supportmekanismerna för att finansiellt stödja förnybar energiproduktion används i allt mindre grad för denna teknologi då den börjar anses mogen att konkurrera utan. Ett solkraftverk har således ett driftsprotokoll som bestämmer när el ska genereras. Dessa protokoll är oftast förutbestämda, vilket innebär att en optimal produktion inte fås då exempelvis elspotpriset och solinstrålningen varierar. I detta examensarbete har en optimeringsalgoritm för elförsäljning designats (i MATLAB). Optimeringsscriptet är designat genom att för en given tidsperiod lösa ett optimeringsproblem där objektivet är maximerad vinst från såld elektricitet från solkraftverket. Funktionen tar hänsyn till timvist varierande elpris, timvist varierande solfältseffektivitet, energiflöden i solkraftverket, kostnader för uppstart (on till off) samt villkor för att logiskt styra de olika driftlägena. För att jämföra prestanda hos ett solkraftverk med det optimerade driftsprotokollet skapades även två traditionella förutbestämda driftprotokoll. Dessa tre driftsstrategier utvärderades i tre olika marknader, en med ett varierande el-spotpris, en i en reglerad elmarknad med tre prisnivåer och en i en marknad med spotpris men noll-pris under de soliga timmarna. Det fanns att det optimerade driftsprotokollet gav både större elproduktion och högre vinst i alla marknader, men störst skillnad fanns i de öppna spotprismarknaderna. För att undersöka i vilket slags kraftverk som protokollet levererar mest förbättring i gjordes en parametrisk analys där storlek på lagringstank och generator varierades, samt optimerarens tidshorisont och kostnad för uppstart. För lagringstank och generator fanns att vinst ökar med ökande storlek upp tills den storlek optimeraren har möjlighet att fördela produktion på dyrast timmar. Ökande storlek efter det ger inte ökad vinst. Ökande tidshorisont ger ökande vinst eftersom optimeraren då har mer information. Att ändra uppstartkostnaden gör att solkraftverket uppträder mindre flexibelt och har färre cykler, dock utan så stor påverkan på inkomst.
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Bame, Aaron T. "Optimization of Solar-Coal Hybridization for Low Solar Augmentation". BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/8942.
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One approach to enabling a larger penetration of renewable sources of energy is the implementation of hybrid power plants. This work presents a process to determine the preliminary optimal configuration of a concentrating solar power-coal hybrid power plant with low solar augmentation, and is demonstrated on a coal power plant in Castle Dale, UT. A representative model is developed and validated against published data for a coal power plant of a different configuration than Hunter Unit 3. The simplifications within the representative model include combining multiple feedwater heaters, combining turbines that operate across the same boundary states, and the mass-average calculation for extraction properties to the combined feedwater heaters. It is shown that the representative model can accurately and consistently simulate a coal power plant. Comparing net power generation and boiler heating estimates from the representative model to the benchmark power plant, the representative model is accurate to within +/- 1% the accepted value from the benchmark power plant. The methods for quantifying solar resource with data from the National Renewable Energy Laboratory are presented with the derivation of an algorithm to simulate a concentrating solar power field arrangement. The solar contribution to electrical power output is estimated using an exergy balance. A simplified financial model is also developed to estimate the solar marginal levelized cost of electricity and payback time using a cash-flow analysis. Estimates for solar resource, solar contribution, and financial performance are consistent with data published by the National Renewable Energy Laboratory or in archival literature. A multi-objective optimization routine is developed consisting of the representative model, the augmentation of solar energy into the solar integration model by means of feedwater heater bypass, solar contribution, levelized cost of electricity, and payback time. Because this study considered complete FWH bypass, higher solar augmentation (>3% of boiler heating) is required for a hybrid design to be considered feasible. However, for higher solar augmentation, the costs are also considerably higher and the financial benefit is insufficient to make any hybrid designs feasible unless a carbon tax is in place. A carbon tax will amplify the financial benefit of hybridization, so optimization results are provided assuming a carbon tax value equivalent to the value used in California's Emissions Trading System (16 USD sh.tn.^-1). The impact of a green energy premium price paid by consumers is also explored in the context of payback time. The resulting optimal design for the Hunter Unit 3 with a carbon tax and no premium is using parabolic trough collector technology at an augment fraction of k=9% to bypass feedwater heater 6. The resulting marginal solar levelized cost of electricity is 9.5 x 10^-4 USD kWh^-1 with an estimated payback time of 25.2 years. This process can be applied to any coal power plant for which operating data and meteorological data are available to evaluate preliminary hybridization feasibility.
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Fernandez, Randyll R. M. "A novel Photovoltaic Power Converter for military and space applications". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Sep%5FFernandez.pdf.
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Clarke, Daniel. "Stand-alone solar-pv hydrogen energy systems incorporating reverse osmosis". Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2015. https://ro.ecu.edu.au/theses/1750.
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The world’s increasing energy demand means the rate at which fossil fuels are consumed has increased resulting in greater carbon dioxide emissions. For many small (marginalised) or coastal communities, access to potable water is limited alongside good availability of renewable energy sources (solar or wind). One solution is to utilise small-scale renewably powered stand-alone energy systems to help supply power for everyday utilities and to operate desalination systems serving potable water (drinking) needs reducing diesel generator dependence. In such systems, on-site water production is essential so as to service electrolysis for hydrogen generation for Proton Exchange Membrane (PEM) fuel cells. Whilst small Reverse Osmosis (RO) units may function as a (useful) dump load, it also directly impacts the power management of stand-alone energy systems and affects operational characteristics. However, renewable energy sources are intermittent in nature, thus power generation from renewables may not be adequate to satisfy load demands. Therefore, energy storage and an effective Power Management Strategy (PMS) are vital to ensure system reliability.
This thesis utilises a combination of experiments and modelling to analyse the performance of renewably powered stand-alone energy systems consisting of photovoltaic panels, PEM electrolysers, PEM fuel cells, batteries, metal hydrides and Reverse Osmosis (RO) under various scenarios. Laboratory experiments have been done to resolve time-resolved characteristics for these system components and ascertain their impact on system performance. However, the main objective of the study is to ascertain the differences between applying (simplistic) predictive/optimisation techniques compared to intelligent tools in renewable energy systems. This is achieved through applying intelligent tools such as Neural Networks and Particle Swarm Optimisation for different aspects that govern system design and operation as well as solar irradiance prediction.
Results indicate the importance of device level transients, temporal resolution of available solar irradiance and type of external load profile (static or time-varying) as system performance is affected differently. In this regard, minute resolved simulations are utilised to account for all component transients including predicting the key input to the system, namely available solar resource which can be affected by various climatic conditions such as rainfall. System behaviour is (generally) more accurately predicted utilising Neural Network solar irradiance prediction compared to the ASHRAE clear sky model when benchmarked against measured irradiance data. Allowing Particle Swarm Optimisation (PSO) to further adjust specific control set-points within the systems PMS results in improvements in system operational characteristics compared to using simplistic rule-based design methods. In such systems, increasing energy storage capacities generally allow for more renewable energy penetration yet only affect the operational characteristics up to a threshold capacity. Additionally, simultaneously optimising system size and PMS to satisfy a multi-objective function, consisting of total Net Present Cost and CO2 emissions, yielded lower costs and carbon emissions compared to HOMER, a widely adopted sizing software tool. Further development of this thesis will allow further improvements in the development of renewably powered energy systems providing clean, reliable, cost-effective energy. All simulations are performed on a desktop PC having an Intel i3 processor using either MATLAB/Simulink or HOMER.
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Robb, David MacKenzie. "Model based predictive control with application to renewable energy systems". Thesis, University of Strathclyde, 2000. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=20379.
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In the promotion and development of renewable energy systems, control engineering is one area which can directly affect the overall system performance and economics and thus help to make renewable energies more attractive and popular. For cost effectiveness, ideally the renewable energy industry requires a control design technique which is very effective yet simple with methods that are transparent enough to allow implementation by non-control engineers. The objective of this thesis is to determine if Model Based Predictive Control (MBPC) is a suitable control technique for use by the renewable energy industry. MBPC is chosen as it uses simple and fairly transparent methods yet claims to be powerful and can deal with issues, such as non linearities and controller constraints, which are important in renewable energy systems. MBPC is applied to a solar power parabolic trough system and a variable speed wind turbine to enable the general applicability of MBPC to renewable energy systems to be tested and the possible benefits to the industry to be assessed. Also by applying the MBPC technique to these two strongly contrasting systems much experience is gained about the MBPC technique itself, and its strengths and weaknesses and ease of application are assessed. The investigation into the performance of Model Based Predictive Control and in particular its application in the renewable energy industry leads to two contrasting conclusions. For simple systems with non-demanding dynamics and having a good model of the system, MBPC provides a very good and effective solution. However for more demanding systems with complex dynamics and strong non-linearities, a basic MBPC controller, applied by a non-control engineer, cannot be recommended.
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Luce, Richard C. "Spacecraft power beaming and solar cell annealing using high-energy lasers". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FLuce.pdf.
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Thesis (M.S. in Astronautical Engineering)--Naval Postgraduate School, December 2002.Thesis advisor(s): Sherif Michael, Oscar Biblarz. Includes bibliographical references (p. 75-78). Also available online.
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Pacheco, Juliano de Pellegrin. "Otimização da energia geradas por painéis solares fotovoltaicos em sistemas isolados da rede elétrica". Universidade Tecnológica Federal do Paraná, 2009. http://repositorio.utfpr.edu.br/jspui/handle/1/905.
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Fundação AraucáriaEsta dissertação de mestrado apresenta o estudo, desenvolvimento e implementação de uma nova estrutura, composta por um conversor CC-CC bidirecional, conectada em paralelo com o sistema, para busca do ponto de máxima potência em painéis solares fotovoltaicos para aplicações isoladas da rede elétrica. Inicialmente são expostos os principais fatores que levaram à escolha do tema, assim como a problemática que motivou essa dissertação. Na seqüência é realizado um estudo sobre energia fotovoltaica, onde são mencionados os principais tipos de células fotovoltaicas e o comportamento de um módulo fotovoltaico em função da variação climática. Também são apresentados nesta dissertação os resultados do estudo, simulações, implementação e comparação entre os algoritmos de busca automática do ponto de máxima potência (MPPT) de módulos fotovoltaicos, baseados no método da Perturbação & Observação (P&O) e no método fuzzy. A seguir são mostrados os detalhes do funcionamento da nova estrutura proposta para busca do ponto de máxima potência (MPPT), onde se utiliza um conversor bidirecional (buck-boost) conectado em paralelo com o sistema, bem como o resultado das simulações da nova estrutura proposta que foram realizadas. Por fim, são apresentados os resultados experimentais dos ensaios realizados em laboratório e do comportamento de um módulo fotovoltaico real conectado à nova estrutura proposta. Os resultados experimentais comprovam a melhoria no rendimento do sistema fotovoltaico quando comparado com as soluções clássicas para a busca do ponto de máxima potência.
This work presents the analysis, design, and implementation of a new parallel connected structure, composed by a parallel bidirectional DC-DC power convert, for maximum power point tracking of stand-alone photovoltaic power generation systems. At first, the main factors that motivated the choice the topic of this work are presented. In sequence, the main types of photovoltaic cells and the photovoltaic panel characteristics in function of the climatic variation are analyzed. The study, implementation, comparison and simulation results of algorithm of maximum power point tracking (MPPT) also are presented in this work. The algorithm of MPPT are based in the method of Perturbation and Observation (P&O) and in the fuzzy method. Following, the characteristics of the new structure proposal, composed by a parallel connection bidirectional DC-DC converter simulations results. Finally, are presented the laboratorial experimental results and the behavior or a real photovoltaic module connected to the new structure proposal.
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Cuamba, Boaventura Chongo. "Studies of the performance of photovoltaic power plant in a Southern African environment". Thesis, Northumbria University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245208.
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Bliss, Martin. "Measurement system for fast power and energy rating of photovoltaic devices". Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8336.
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This thesis presents a new type of solar simulator and new measurement methods that allow for fast power rating of photovoltaic devices and for fast performance measurements for energy rating and energy yield predictions indoors under controlled, and more realistically simulated outdoor conditions. A novel indoor measurement system for photovoltaic device characterisation based on light emitting diodes (LEDs) as the light sources is described. The solar simulator is capable of reproducing spectral changes seen in natural sunlight, with its intricacies of variable air mass and weather conditions, to a better match than previously possible. Furthermore, it allows measurements under varying light intensity and device temperature. The prototype LED-based solar simulator developed is characterised and its measurement quality is analysed. The system achieves a class BAA solar simulator classification with a class B spectral match, class A light intensity uniformity and a class A temporal stability. It is the first system of its kind that meets the standards of a solar simulator in spectral match to the standard sunlight spectrum and in terms of minimum light intensity. An uncertainty analysis shows that calibration uncertainty for crystalline silicon solar cells is 5% in maximum power with a 95.45% level of confidence. Recommendations for further versions of the solar simulator are given and show potential of reducing this uncertainty down to 2.9% across all measurement spectra (1.8% with a primary calibrated reference cell). A new method for automated power-rating of single- and multi-junction devices is developed. The method uses a unique spectral response measurement and fitting method. It eliminates the need of external measurement equipment for determining spectral response. A simulated characterisation of an amorphous silicon single- and double-junction solar cell show accuracy of better than 0.5% in maximum power. First measurements on the LED-based solar simulator show a measurement error of 4.5% in maximum power, which is due to a lack of measurement feedback of spectral output and measurement irradiance. The first three-dimensional performance matrix for use in photovoltaic energy rating is reported, utilising the LED-based solar simulator. Device characteristics are measured indoors under varying irradiance, temperature and spectrum. A measurement method is detailed and utilised on a crystalline and amorphous silicon solar cell. It allows for the first time a direct investigation of spectral effects on photovoltaic devices under controlled conditions. Results show that amorphous silicon devices are very sensitive to changes in spectrum. Thus, spectral effects should not be neglected in energy yield predictions for such devices.
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RANAWEERA, CHAMINDA. "Electric Power System of an Emergency Energy Module". Thesis, KTH, Kraft- och värmeteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-109304.
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Abstract This thesis study is on designing and analysing the “Electric Power System of an Emergency Energy Module”. KTH is running a project to create a mobile system for power supply in refugee camps and during the recovery of natural disasters. This is an independent power system comprising solar, wind and biomass based power generations and control. The design and analysis of electric power system is mainly focused on increasing the renewable energy efficiency of the system while saving excess power on the battery bank and controlling the battery discharging. The analysis of the designed electric power system is done with using actual site data of solar irradiation and wind for one week period. Further, it has been developed a program based on MS Excel for analysing the module performances at any site in the world. Keywords: Emergency Energy Module; Integration of wind and solar PVEmergency Energy Module Project
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Aljaism, Wadah A., University of Western Sydney i School of Engineering and Industrial Design. "Control method for renewable energy generators". THESIS_XXX_EID_Aljaism_W.xml, 2002. http://handle.uws.edu.au:8081/1959.7/796.
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This thesis presents a study on the design method to optimise the performance for producing green power from multiple renewable energy generators. The design method is presented through PLC (Programmable Logic Controller) theory. All the digital and analogue inputs are connected to the input cards. According to different operations conditions for each generator, the PLC will image all the inputs and outputs, from these images; a software program has been built to create a control method for multiple renewable energy generators to optimise production of green power. A control voltage will supply the output contractor from each generator via an interface relay. Three renewable generators (wind, solar, battery bank) have been used in the model system and the fourth generator is the back up diesel generator. The priority is for the wind generator due to availability of wind 24 hours a day, then solar, battery bank, and LPG or Diesel generators. Interlocking between the operations of the four contractors has been built to prevent interface between them. Change over between contractors, according to the generator's change over has also been built, so that it will delay supplying the main bus bar to prevent sudden supply to the load. Further study for controlling multiple renewable energy generators for different conditions such as controlling the multi-renewable energy generators from remote, or supplying weather forecast data from bureau of meteorology to the PLC directly as recommended.Master of Electrical Engineering (Hons)
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Ma, Anthony Winston. "Modeling and Analysis of a Photovoltaic System with a Distributed Energy Storage System". DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/727.
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As California continues to integrate more renewable energy into its electrical system, the state has experienced a corresponding rise in photovoltaic system installations. PV arrays are a unique source of power generation in that they are affected by the location of the sun, shading, and temperature changes. These characteristics make solar one of the most highly variable forms of renewable energy. In order to improve solar power’s consistency, PV systems require a supplemental source of power. The primary focus of this paper is to determine if distributed energy storage systems can be used to reduce the effect of solar intermittency. This paper examines the test data and system specifications of an experimental DESS. The benefits of using a DESS in a PV system are further studied using computer simulation modeling. This paper also shows through computer simulations how a maximum power point tracker can increase a PV array’s power output. The results of this thesis demonstrate that DESS’s are capable of smoothing out highly variable load profiles caused by intermittent solar power.
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Alsagri, Ali Sulaiman. "Thermoeconomic and Optimization Analysis of Advanced Supercritical Carbon Dioxide Power Cycles in Concentrated Solar Power Application". University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1528816504089412.
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Guerreiro, Luís. "Energy optimization of a concentrated solar power plant with thermal storage". Doctoral thesis, Universidade de Évora, 2016. http://hdl.handle.net/10174/25594.
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One of the most relevant problems to solve at a planetary scale is the access to an affordable
clean source of energy as CO2 equivalent emissions should be reduced significantly. Some
authors aim for a zero emissions target for 2050. Renewable energies will play a leading role in
this energy transition, and solar energy with storage is a promising technology exploring a
renewable and worldwide available resource.
Within the present thesis component development like a new thermal storage thermocline tank
design or having latent heat storage capability are technological developments that have been
pursued and analyzed on a system perspective basis, focusing on reducing the LCOE value of
a commercial STE plant using TRNSYS software. Material research with molten salts mixtures
and cement based materials has been performed at lab scale. A fully validation should occur
through a 13 partners pan-European H2020 project called NEWSOL which has been developed
supported on the laboratory data obtained.
Moreover, incorporation of local available material, “modern slag” from an old mine of Alentejo
region, was also studied. The material could be used as an aggregate incorporated into calcium
aluminate cement (CAC) or as filler. This would help to solve a local environmental complex
problem related to soil, air and water pollution due to heavy metals and mining activity in Mina
de São Domingos, Southeast of Portugal.
The integration of these results underlies a broad energy transition model, a proposal is
presented in this thesis, with the aim to foster development towards a sustainable usage of
resources and promote clean technologies especially in the energy sector. This model can be
locally adapted depending on the pattern of existing industries. The goal is to achieve a smooth
transition into a clean tech energy society in line with the target of achieving zero emissions for
2050; Optimização Energética de uma Central de
Concentração Solar com Armazenamento de Energia
Resumo:
Um dos problemas mais relevantes a resolver a uma escala planetária é o acesso, com um
custo moderado, a fontes limpas de energia considerando que as emissões equivalentes de
CO2 derão ser reduzidas drasticamente. Alguns autores ambicionam mesmo um objetivo de
zero emissões em 2050. As energias renováveis irão desempenhar um papel preponderante
nesta transição energética, sendo que a energia solar com armazenamento é uma tecnologia
promissora que aproveita um recurso renovável e disponível em boa parte do Planeta.
Na presente tese foi realizado o desenvolvimento de componentes nomeadamente o design
que um novo tanque do tipo termocline, ou de novos elementos recorrendo ao calor latente,
desenvolvimentos tecnológicos que foram analizados de uma perspectiva de sistema, dando o
enfoque na redução do custo nivelado da electricidade (LCOE) para uma planta Termosolar
usando o software TRNSYS. Foi também realizada investigação em laboratório ao nível dos
materiais com várias misturas de sais fundidos inclusivé em contacto directo com materiais de
base cimenticia. Uma validação completa deverá ocorrer no projeto NEWSOL do programa
H2020 que reúne um consórcio de 13 parceiros europeus e que foi preparado e submetido
tendo por base os resultados laboratoriais obtidos.
Adicionalmente, incorporação de material disponível (escória de minério) de uma mina
abandonada da região do Alentejo foi outro dos aspectos estudados. Verificou-se que este
material poderá ser utilizado como agregado num ligante do tipo cimento de aluminato de
cálcio (CAC) ou como “filler”. Este re-aproveitamento resolveria um problema ambiental
complexo derivado do elevado conteúdo de metais pesados resultantes da actividade de
mineração e que actualamente provocam poluição do solo, água e ar na área da Mina de São
Domingos, Sudeste de Portugal.
Estes progressos deverão ser integrados num modelo de transição energética mais amplo. Na
presente tese, uma proposta concreta é apresentada, com o objectivo de incentivar o
desenvolvimento na direção de uma utilização sustentável dos recursos e a promoção de
tecnologias limpas nomeadamente no sector da energia. Este modelo poderá ser adaptado
localmente dependendo do padrão de indústrias existente. O objectivo é atingir uma transição
suave para uma sociedade de energias limpas em linha com o objectivo de atingir zero
emissões de CO2 equivalente em 2050.
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Calderón, Díaz Alejandro. "Study of solid particle materials as high temperature Thermal Energy Storage and Heat Transfer Fluid for Concentrating Solar Power". Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667863.
Pełny tekst źródłaStreszczenie:
Renewable energies have a major role in today’s energy systems development, energy security and climate change fight. Thermal Concentrating Solar Power (CSP) has the potential to get up to 11.3% of world’s electricity production with the adequate support. This type of renewable energy has proved to be price competitive and to have the advantage of integrating Thermal Energy Storage (TES). This adds the generation flexibility that other renewable energies, like wind or photovoltaics, does not have integrated.
In order to continue developing this technology, solid particle CSP has been proposed. This design uses granular solid materials as Heat Transfer Fluid (HTF) and TES material in solar towers in order to be able to achieve higher operation temperatures, than current commercial CSP. Higher temperature means more efficiency in heat-to-electricity conversion, due to the use of better power generation cycles.
The main objective of this thesis is to enhance relevance and provide theoretical and experimental background for solid particles to be used as TES material and HTF for CSP tower power plants, from the materials perspective, by using existent or new methodologies.
During this dissertation, current scientific output and relevance were studied in two separate contributions, one for CSP and the other for TES, both by using bibliometric methods. For the CSP study, additional analyses were carried out according to the harvesting technologies (parabolic trough, solar tower, Stirling dish and linear Fresnel). For the TES study, the additional analyses were performed according to the different ways to store thermal energy (sensible, latent and thermochemical). For both analyses, most productive countries, regions, authors, journals and research communities were identified. Moreover, funding impact and cooperation between countries and authors were analyzed. For developing these bibliometric analyses, a specific methodology was implemented following Bibliometrics principles. For these purposes, two existing software programs were used for a part of the analysis, while for performing the rest of the analysis a special software was developed ad-hoc for this study.
For providing background, two state-of-the-art analyses were performed in order to get current development status of solid particle CSP. The first one was oriented to the plant design itself. Several solar receivers were analyzed, as well as TES, Heat Exchanger (HEX) and conveyance systems. During the second state-of-the-art, a material driven study was carried out in order to understand the behavior expected by the particle media and to identify some of the materials proposed by the most relevant researchers in this field.
Next step of this dissertation was focused on establishing the design criteria for solid particle CSP technology, from the materials science perspective. This was achieved by finding the most relevant objectives that a power plant of this kind must comply, as well as the influence of the particle media properties and parameters.
Last part of this dissertation is related with two studies regarding the durability of some of the most promising solid particle materials from high temperature exposure effect perspective. The first study was focused on analyzing the effect of long term high temperature (900 °C) in the optical, mechanical, thermal and chemical properties and parameters of the solid particle material. The second study was focused in the effect of long term thermal cycling, in which is considered that the materials should resist several thousand charge-discharge cycles remaining with acceptable operational conditions. For achieving an accelerated thermal cycling test with realistic thermal conditions, a novel device was developed to perform the thousands of thermal cycles required. Electronic, software and hardware design was developed and implemented. Current device has performed more than 20 thousand cycles for different kind of materials, analyzing the same properties and parameters as the first study.Para continuar desarrollando la energía solar de concentración (CSP), se ha propuesto el uso de sólidos particulados. En este nuevo tipo de planta CSP de torre, se utilizan materiales sólidos granulados como Fluido de Transferencia de Calor (HTF) y material para el almacenamiento de energía térmica (TES). El objetivo principal de esta tesis es establecer la relevancia y proporcionar antecedentes, tanto teóricos como experimentales, sobre el uso de sólidos particulados para esta nueva tecnología. Durante este trabajo, la producción científica actual y la relevancia científica fueron estudiados mediante dos estudios bibliométricos, una para CSP y otra para TES. Para ambos análisis, se identificaron los países, regiones, autores, revistas, comunidades de investigación más productivos, el impacto del financiamiento y la cooperación entre países y autores. Para este fin, se utilizaron tres programas informáticos, de los cuales uno tuvo que se desarrollado a la medida. Se realizaron dos análisis del estado del arte para obtener el estado actual de desarrollo de las plantas CSP con uso de sólidos particulados. En el primero, se analizaron varios receptores solares, así como sistemas TES, intercambiadores de calor (HEX) y sistemas de transporte del material granulado. En el segundo, se llevó a cabo un estudio basado en los sólidos particulados, comprendiendo el comportamiento de estos materiales, así como recopilar los materiales potenciales. Se establecieron los criterios de diseño desde la perspectiva de los materiales, logrando encontrar los objetivos relevantes, y la influencia de las propiedades y parámetros de estos materiales. Se realizaron dos estudios sobre la durabilidad en cuanto a la exposición a altas temperaturas. El primero, se centró en analizar el efecto de la temperatura a largo plazo y su efecto en las propiedades ópticas, mecánicas, térmicas y químicas. El segundo, se centró en el efecto de los miles de ciclos térmicos esperados. Se desarrolló un nuevo dispositivo capaz de realizar los ciclos térmicos requeridos en las condiciones requeridas. Se desarrolló e implementó el diseño electrónico, de software y de hardware. Se caracterizaron las mismas propiedades analizadas en el primer estudio.
39
Murray, Daniel. "Small-Scale Solar Central Receiver System Design and Analysis". DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/793.
Pełny tekst źródłaStreszczenie:
This thesis develops an analytical model of a small-scale solar central receiver power plant located at the California Polytechnic State University in San Luis Obispo, California at 35.28° N, 120.66° W. The model is used to analyze typical energy output at any time during the year. The power plant is designed to produce an output of 100 kW electrical power, and is supplemented by the combustion of natural gas. Methodologies for determining the proper size and layout of heliostats, optimal tower height, receiver size, and turbine engine selection are developed. In this specific design, solar shares of up to 73.2% and an annual average of 44% are possible through the use of a gas-solar hybrid microturbine engine. Larger solar shares are not possible due to the limited size of land (about 0.5 acres used for this project) which limits the number of possible heliostat installations.
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Ogunmodimu, Olumide Oluwaseun. "Potential contribution of solar thermal power to electricity supply in Northern Nigeria". Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/16957.
Pełny tekst źródłaStreszczenie:
Energy is an essential requirement for a reasonable socio economic development in a country; however, its provision depends on availability of energy sources and the require d investment. Nigeria possesses abundant deposits of energy sources ranging from fossil fuel to renewable energy sources. Over the years, the level of production of energy from these sources has been considerably low. The present level of electricity supply is short of demand and the supply is not reliable. As the country is experiencing rapid growth in population, adequate energy provision is necessary for corresponding level of production and development. The need for sustainable and renewable sources of energy has emerged globally owing to environmental issues associated with the use of conventional fuel. In order to consider the possibility of harnessing the solar energy resource in northern Nigeria, this study explores the potential contribution of the adoption of Concentrated Solar Power (CSP) technology to the energy system in the far northern States of Nigeria. These States are chosen because the region lies within a high sunshine belt and thus having a daily average DNI of 6.2 KWh/m2 / day and an annual average of 2320 KWh/m2/yr. The annual average DNI in the region is a bit higher than that of the Andasol CSP plant in Spain which is 2090 KWh/m2/yr. The thesis seeks to uncover the potential for CSP in Nigeria, and determine when the cost of energy from CSP will become competitive with the cost of energy from conventional power. Using three possible economic growth scenarios (reference (7%), high (10%) and optimistic (13%) economic growth scenarios) to model future energy demand and supply from CSP and conventional gas plant. The results obtained show possible competition from potential CSP plant in Nigeria depending on the international and domestic gas market. However, continuous payment of blanket subsidy on the domestic price of natural gas in Nigeria will adversely affect potential investment in CSP market in Nigeria.
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Miranda, Gilda. "Dispatch Optimizer for Concentrated Solar Power Plants". Thesis, Uppsala universitet, Byggteknik och byggd miljö, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-402436.
Pełny tekst źródłaStreszczenie:
Concentrating solar power (CSP) plant is a promising technology that exploits direct normal irradiation (DNI) from the sun to be converted into thermal energy in the solar field. One of the advantages of CSP technology is the possibility to store thermal energy in thermal energy storage (TES) for later production of electricity. The integration of thermal storage allows the CSP plant to be a dispatchable system which is defined as having a capability to schedule its operation using an innovative dispatch planning tool. Considering weather forecast and electricity price profile in the market, dispatch planning tool uses an optimization algorithm. It aims to shift the schedule of electricity delivery to the hours with high electricity price. These hours are usually reflected by the high demand periods. The implementation of dispatch optimizer can benefit the CSP plants economically from the received financial revenues. This study proposes an optimization of dispatch planning strategies for the parabolic trough CSP plant under two dispatch approaches: solar driven and storage driven. The performed simulation improves the generation of electricity which reflects to the increase of financial revenue from the electricity sale in both solar and storage driven approaches. Moreover, the optimization also proves to reduce the amount of dumped thermal energy from the solar field.
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Hiranvarodom, Somchai. "Design and analytical evaluation of stand-alone photovoltaic power systems for rural areas in Thailand". Thesis, Northumbria University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340072.
Pełny tekst źródła
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Beidalah, Chadrick J. Coudray Aaron D. "The technologies and principles needed for the powering of remote nodes in an interoperability network". Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/March/09Mar%5FBeidalah.pdf.
Pełny tekst źródłaStreszczenie:
Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, March 2009.Thesis Advisor(s): Buddenberg, Rex. "March 2009." Description based on title screen as viewed on April 24, 2009. Author(s) subject terms: Power Generation, Remote Network Node, Interoperability Network, Electric Generator, Wind Power, Solar Power, Photovoltaic, Thermoelectric, Energy Storage, Fuel Cell, Hybrid Power, Power Monitoring, Power Management. Includes bibliographical references (p. 117-120). Also available in print.
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Reese, Justin. "Averaged Model of a Three-Port Solar Power Converter". Honors in the Major Thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/987.
Pełny tekst źródłaStreszczenie:
This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.Bachelors
Engineering and Computer Science
Electrical Engineering
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Vourazelis, Dimitrios G. "Optimization in solar heating/photovoltaic systems". Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA242363.
Pełny tekst źródłaStreszczenie:
Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, December 1990.Thesis Advisor(s): Titus, Harold A. Second Reader: Michael, Sherif. "December 1990." Description based on title screen as viewed on March 30, 2010. DTIC Descriptor(s): Heat Transfer, Theory, Theses, Costs, Heating Elements, Fluid Dynamics, Photovoltaic Effect, Solar Heating, Swimming, Optimization, Installation. DTIC Identifier(s): Swimming Pools, Solar Heating, Photovoltaic Supplies, Filter Pumps, Theses. Author(s) subject terms: Optimization, Solar Heating, Photovoltaics. Includes bibliographical references (p. 57). Also available in print.
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Chien, Chih-Tao. "Carbon-based nanomaterials for solar energy harvesting and storage devices towards integrated power platform". Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708903.
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Assembe, Cedric Obiang. "Integrated solar photovoltaic and thermal system for enhanced energy efficiency". Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2387.
Pełny tekst źródłaStreszczenie:
Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2016.South Africa has raised concerns regarding the development of renewable energy sources such as wind, hydro and solar energy. Integration of a combined photovoltaic and thermal system was considered to transform simultaneous energy into electricity and heat. This was done to challenge the low energy efficiency observed when the two solar energy conversion technologies are employed separately, in order to gain higher overall energy efficiency and ensure better utilization of the solar energy. Therefore, the notion of using a combined photovoltaic and thermal system was to optimize and to improve the overall PV panel efficiency by adding conversion to thermal energy for residential and commercial needs of hot water or space heating or space cooling using appropriate technology. The PV/T model constructed using water as fluid like the one used for the experimental work, presented a marginal increase in electrical efficiency but a considerable yield on the overall PV/T efficiency, because of the simultaneous operation by coupling a PV module with a thermal collectors.
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Alpalhão, Ana Margarida Machado. "Equity research - Galp Energia SGPS SA : valuation of the power business unit". Master's thesis, Instituto Superior de Economia e Gestão, 2020. http://hdl.handle.net/10400.5/20710.
Pełny tekst źródłaStreszczenie:
Mestrado em FinançasEste projeto consiste num relatório de avaliação da empresa GALP Energia S.G.P.S., S.A., com especial foco na unidade de negócio de eletricidade e a contribuição dos seus projetos solares mais recentes para o preço-alvo de 2020YE. O relatório segue o formato recomendado pelo CFA Institute, uma vez que, grande parte do mesmo, foi submetido para o CFA Institute Research Challenge de 2020. A GALP é a principal Empresa Integrada de Petróleo em Portugal. Opera em toda a cadeia de valor do combustível fóssil, desde a extração do mesmo, o seu transporte e refinação, e por fim a comercialização dos diferentes subprodutos. Foi aplicada a abordagem de Soma das Partes para avaliar a GALP, aplicando o FCFF DCF a cada unidade de negócio, de forma a refletir todas as idiossincrasias de cada unidade. O resultado gerou um preço-alvo de 12,1€/sh. Foram também utilizados outros métodos para complementar a avaliação, como o FCFF DCF para a empresa como um todo, o FCFE DCF, o APV e o DDM. Foi ainda realizada uma análise complementar à contribuição dos projetos mais recentes da GALP em energia solar, para o preço-alvo inicial de 12,1€/sh, uma vez que o nosso relatório inicial não considerou esses projetos porque apenas foram anunciados após a conclusão do relatório inicial. Ao adicionar os investimentos mais recentes da GALP em projetos de energia solar, a minha recomendação de investimento fornece informações mais precisas e atualizadas aos investidores e às suas decisões de investimento. Este capítulo reforça a nossa recomendação de compra.
This project is an Equity Research of GALP Energia S.G.P.S., S.A., with a special focus on the value added by the power business unit's most recent solar projects to the initial 2020YE price target. The report follows the CFA Institute format, as a significant portion of it was submitted for the 2020 CFA Institute Research Challenge. Only public information released until January, 2nd 2020 was considered. GALP is the leading Portuguese Integrated Oil Company. It operates throughout the whole fossil fuel value chain, from extracting fossil fuel, to transporting and refining it, and then commercializing the different by-products. It was applied a Sum-of-the-Parts approach to value GALP, where a FCFF DCF was applied to each business unit, reflecting all the idiosyncrasies of each unit. The result yielded a final price target of 12.1€/sh. Other methods were also used to support the valuation, such as a FCFF DCF for the company as a whole, FCFE DCF, the APV and the DDM. A complementary analysis to the contribution of GALP's most recent projects in solar energy to the initial price target of 12.1€/sh was carried out, since our initial report didn't incorporate these projects, as they were announced after the initial report was concluded. By adding GALP's most recent investments in solar energy projects, I believe our investment recommendation provides more accurate and updated information to investors and to their investment decision. It is also of importance to highlight that this chapter further supports our buy recommendation.
info:eu-repo/semantics/publishedVersion
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Shao, Hui. "System design and power management for ultra low energy applications using energy harvesting techniques /". View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?ECED%202009%20SHAO.
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Hicks, Nathan Andrew. "Solar Power for Deployment in Populated Areas". DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/141.
Pełny tekst źródłaStreszczenie:
The thesis presents background on solar thermal energy and addresses the structural challenges associated with the deployment of concentrating solar power fields in urban areas. Two potential structural systems and urban locales of deployment are proposed and investigated to determine whether they have the potential to be a cost-effective renewable energy solution for urban areas. The structural issues explored in the thesis include flutter, the wind loading of open frame structures, performance-based design, and the design of flexibly mounted equipment on a building.