Dissertations / Theses on the topic 'Solar aided power generation'
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Sheu, Elysia J. (Elysia Ja-Zeng). "Hybrid solar-fossil fuel power generation." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/78189.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 83-92).
In this thesis, a literature review of hybrid solar-fossil fuel power generation is first given with an emphasis on system integration and evaluation. Hybrid systems are defined as those which use solar energy and fuel simultaneously, thus excluding the viable alternative of solar thermal plants which use fossil fuels as backup. The review is divided into three main sections: performance metrics, the different concentrated solar receiver technologies and their operating conditions, and the different hybridization schemes. In addition, a new linear combination metric for analysis of hybrid systems, which considers trade-off of different metrics at the fleet level, is presented. This metric is also compared to alternative metrics from multi-objective optimization. Some previous work only evaluates the hybrid cycle at a certain point in time, which can be misleading as this evaluation would not take into account certain aspects of hybrid cycle such as fluctuating solar supply. Furthermore, almost all previous work designs the hybrid solar-fossil fuel systems for a certain point in time and then evaluates the performance of the system for an entire year. By not taking into account fluctuating solar supply and selling price of electricity in the design of the system, the best possible annual performance of the hybrid cycle may not be reached. Second, an analysis of solar reforming as the integration method for the hybrid cycle is presented, in particular steam reforming of methane. Two solar reforming systems are analyzed: one with a parabolic trough and the other with a solar tower. From the analysis, it is determined that parabolic troughs are not suitable for steam reforming due to the relatively low operating temperatures. The tower reformer system is integrated with a standard combined cycle, and the design and operation of the hybrid cycle is optimized for highest work output for a fixed fuel input and solar collector area (essentially optimizing for maximum cycle efficiency). A heuristic two step procedure is used for the optimization due to the limitation of the optimizer which cannot simultaneously optimize both design and operation. From the optimization, it is determined that the tower reforming integration method is a promising integration option in that this type of hybrid cycle yields high incremental solar efficiencies and also satisfies the linear combination metric for efficiency and CO₂ emissions (i.e., the analyzed hybrid cycle has a higher efficiency for a fixed CO₂ emissions compared to a linear combination of solar only and fossil fuel only cycles).
by Elysia J. Sheu.
S.M.
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Trolove, Hamish P. "Line focus solar Stirling domestic power generation." Thesis, University of Canterbury. Mechanical Engineering, 1994. http://hdl.handle.net/10092/6468.
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This thesis has found that to generate electricity for a domestic supply, the use of a two stage line focus concentrator coupled to a Stirling engine by way of a heat pipe is very inefficient, and the end result (useful power) could be better achieved by a line focus system with a Rankine cycle heat engine, or by using photovoltaic cells. For larger systems such as that needed to supply a small community, a point focus solar Stirling engine is the most efficient system at this stage, but with the rapid improvements being made in the performance of photovoltaic cells, this may not be the case in the future.
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Amatya, Reja. "Solar thermoelectrics for small scale power generation." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/70784.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 243-253).
In the past two decades, there has been a surge in the research of new thermoelectric (TE) materials, driven party by the need for clean and sustainable power generation technology. Utilizing the Seebeck effect, the thermoelectric devices can be used as heat engines to convert heat into electricity. With no moving parts, the generators are considered highly reliable with low maintenance, which is essential for decentralized power source. With nearly 1.6 billion people living without basic electricity, the need for a small scale power generation is there. Through this work, we show that the solar thermoelectric generators (STEGs) using cheap parabolic concentrators with high ZT modules can be a viable and a costeffective alternative to solar photovoltaics for distributed power generation. The maximum conversion efficiency of 3% has been achieved for a STEG under AM 1.5G conditions with commodity thermoelectric module. The generator was able to produce a peak output power of 11 W, with an inexpensive parabolic solar concentrator which can be found in developing countries being used as solar cookers. The output power is the highest achieved value for concentrated solar thermoelectrics and it is comparable to photovoltaic modules that are deployed in these rural communities. Based on a heat transfer model developed during this work, various system parameters were analyzed for maximizing the performance. An optimized thermoelectric module design with a slight aspect ratio variation for the TE legs have been identified that can increase the efficiency by 28%. Another parameter for system improvement that has been considered is the use of novel TE material. Issues of earth-abundance, material scarcity and cost have been taken into consideration for new material. These are important considerations for a technology that can have a potential cost-effective large scale deployment. A robust, high temperature thermoelectric material characterization tool (Z-meter) has been developed with proper radiation suppression (20x below black body radiation) and low system parasitics (41.6% lower electrical contact parasitic that previous published results). We investigated novel metalsemiconductor superlattice structures ((HfZr)N/ScN) using the Z-meter setup. Low thermal conductivities (2.5-5 W/m.K) have been measured for temperature range of 300-650 K. The Seebeck coefficient of 132 [mu]V/K was measured at 830 K, which is comparable to the state-of-the-art SiGe at similar temperature.
by Reja Amatya.
Ph.D.
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Chalk, Ryan. "Solar power generation in a mining town." Thesis, Chalk, Ryan (2017) Solar power generation in a mining town. Honours thesis, Murdoch University, 2017. https://researchrepository.murdoch.edu.au/id/eprint/38686/.
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Climate change is a pertinent issue facing governments and societies around the world. The industrial revolution has resulted in a steady increase in the average global temperature. The mining and energy production industries have been significant contributors to this change prompting governments to intervene by promoting low emission technology within these sectors. This thesis reviews the energy problem in Australia and the mining sector with a focus on the energy requirements and production methods utilised in Newman WA. BHP operate the largest open cut iron ore mine in the world requiring substantial amounts of energy to maintain.
Renewable energy in the form of utility scale solar photovoltaics (PV) provides a solution to these problems by providing emission free energy which can be used to supplement the existing natural gas turbines in operation. This research presents a custom renewable solution for the Newman scenario considering the specific township network, local weather conditions and load profile. A summary of the required PV output is presented to supply slightly over 50% of the towns power requirements during the peak (summer) period, resulting in close to full coverage in the trough (winter) period. Power Factory is used to simulate the characteristics of the existing infrastructure and produces results of integrating PV. These results conclude that the problems requiring mitigation strategies unacceptable levels of harmonics and low power factor.
Strategies are proposed to control these issues predominantly through the use of high quality, made for purpose inverters. Results show that use of inverters with harmonic filtering dramatically reduce the level of harmonic injections to an acceptable level according to Australian standards. Furthermore, the configuration of inverters to supply active and reactive power assist in mitigating low power factor problems.
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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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Omer, Siddig Adam. "Solar thermoelectric system for small scale power generation." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/7440.
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This thesis is concerned with the design and evaluation of a small scale solarthermoelectric power generation system. The system is intended for electricity generation and thermal energy supply to small scale applications in developing countries of the sunny equatorial regions. Detailed design methodologies and evaluations of both the thermoelectric device and the solar energy collector, which are parts of the combined system, are presented. In addition to experimental evaluations, three theoretical models are presented which allow the design and evaluation of both the thermoelectric module and the solar energy collector. One of the models (a unified thermoelectric device model) concerns the geometrical optimization and performance prediction of a thermoelectric module in power generation mode. The model is unified in the sense that it accounts for the effect of all the parameters that contribute to the performance of the thermoelectric module, a number of which are ignored by the available design models. The unified model is used for a comparative evaluation of five thermoelectric modules. One of these is commercially available and the others are assumed to have optimum geometry but with different design parameters (thermal and electrical contact layer properties). The model has been validated using data from an experimental investigation undertaken to evaluate the commercial thermoelectric module in power generation mode. Results showed that though the commercially available thermoelectric cooling devices can be used for electricity generation, it is appropriate to have modules optimized specifically for power generation, and to improve the contact layers of thermoelement accordingly. Attempts have also been made to produce and evaluate thermoelectric materials using a simple melt-qucnching technique which produces materials with properties similar to those of the more expensive crystalline materials.
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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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Palermo, Rick. "Analysis of solar power generation on California turkey ranches." Thesis, Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1607.
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Sheu, Elysia J. (Elysia Ja-Zeng). "A solar reforming system for use in hybrid solar-fossil fuel power generation." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/103734.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 229-241).
As demand for energy continues to rise, the concern over the increase in emissions grows, prompting much interest in using renewable energy resources such as solar energy. However, there are numerous issues with using solar energy including intermittency and the need for storage. A potential solution is the concept of hybrid solar-fossil fuel power generation. Previous work has shown that utilizing solar reforming in conventional power cycles has higher performance compared to other integration methods. In this thesis, a two level analysis of a hybrid redox redox cycle is performed. First, a system analysis of a hybrid cycle utilizing steam redox reforming is presented. Important cycle design and operation parameters such as the oxidation temperature and reformer operating pressure are identified and their effect on both the reformer and cycle performance is discussed. Simulation results show that increasing oxidation temperature can improve reformer and cycle efficiency. Also shown is that increasing the amount of reforming water leads to a higher reformer efficiency, but can be detrimental to cycle efficiency depending on how the reforming water is utilized. Next, a system analysis for a CO2 redox reforming hybrid cycle and comparison of cycle and reformer performance between a CO 2 redox reformer and steam redox reformer hybrid cycle are presented. Similar to the steam redox system, results show that increasing the oxidation temperature or the amount of reforming CO2 leads to higher reformer and cycle efficiencies. In addition, the comparison between the CO2 and steam redox reformer hybrid cycles shows that the CO2 cycle has the potential to have better overall performance.Based on the system analysis, a reformer level analysis is also performed. A novel receiver reactor concept for a solar steam redox reformer is presented, and a computational model is developed to assess its performance. The receiver-reactor consists of a dumbbell shape absorber system that has two distinct absorbers. This absorber system setup allows for the switching between reduction and oxidation steps without having to constantly change inlet streams to the reactor and is designed such that the inlet connections do not interfere with the solar window. In addition, at any point in time only one solar absorber is irradiated by the solar energy (during the reduction step). Simulation results show that the receiver-reactor strongly absorbs the solar radiation and most of the radiative heat transfer occurs in the front half of the reactor. Moreover, results show that higher conductivity absorber materials are more suitable for long term reactor operation. A sensitivity analysis is also performed for the solar steam redox reformer with respect to different performance metrics. Important parameters include channel size, inlet temperature, and reformer pressure. Moreover, a strategy for reactor design based on performance as well as integration with the power cycle is discussed.
by Elysia J. Sheu.
Ph. D.
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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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Jradi, Fadi M. "Organic light-harvesting materials for power generation." Diss., Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/54976.
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This dissertation focuses on the design, synthesis, and characterization of a variety of organic dyes, semiconducting materials, and surface redox-active modifiers of potential interest to organic-based emerging photovoltaics. A discussion of the materials’ optoelectronic properties, their ability to modify and promote electron transfer through an organic/transparent conducting-oxide interface, and finally their effect on the photovoltaic properties of devices utilizing them as light-harvesters is provided where relevant. The first two research chapters discuss mono-chromophoric asymmetric squaraine-based sensitizers and covalently linked, dual-chromophoric, porphyrin-squaraine sensitizers as light absorbers in dye-sensitized solar cells (DSSCs), in an attempt to address two problems often encountered with DSSCs utilizing this class of near infra-red sensitizers; The lack of panchromatic absorption and aggregation on the surface. Also, this dissertation discusses the design and synthesis of asymmetric perylene diimide phosphonic acid (PDI-PA) redox-active surface modifiers, and reports on the electron-transfer rates and efficiencies across the interface of an ITO electrode (widely used in organic-electronic devices) modified with these perylene diimides. Finally two series of hole-transport materials based on oligothiophenes and benzodithiophenes are reported: optoelectronic properties and preliminary performance of organic photovoltaic (OPV) devices fabricated with them is discussed.
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Dintrans, Philippe Lucien. "Solar ponds for electric power generation : cost model and feasibility study." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/44652.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1985.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.
Vita.
Bibliography: leaves 126-127.
by Philippe Lucien Dintrans.
M.S.
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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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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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Wang, Xiaoting. "Very High Efficiency Solar Cell (VHESC) sub-module measurement." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 55 p, 2008. http://proquest.umi.com/pqdweb?did=1654493881&sid=1&Fmt=2&clientId=8331&RQT=309&VName=PQD.
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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.
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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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Washika, Tony. "Renewables Based Power generation for Kenya Pipeline Company." Thesis, KTH, Kraft- och värmeteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-131315.
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This study presents a Techno-economic assessment of a renewables based power generation project for PS 21, a Pumping Station for Kenya Pipeline Company located in Nairobi, Kenya. The load for the pumping station is 1135 kW Continuous. The assessment criteria used was levelized cost of energy. The hybrid renewable energy system software HOMER was used for assessment, and modeling was done using hourly TMY data for solar irradiance and wind. According to the results, Hybrid Solar PV-Wind- Battery renewable energy systems can supply adequate power for pumping station purposes. Optimization modeling at 2010 prices gave a levelized cost of energy of $0.2 per kWh for the most optimal solution which consisted of 2 No. 1650 kW Vestas V 82 Wind Turbines and 4070 kW of PV modules. This cost of energy just matches the purchase price from the National grid which varies between $0.14 and $0.2 per kWh, and therefore, the project is economically feasible. Mainly due to concerns of global warming, the view in the Kenyan government and society towards renewable energy is very favorable and the project is also politically and socially feasible. Sensitivity analysis demonstrated that wind energy is more viable than solar PV energy in areas of high wind speeds, with about 7.5 m/s annual average wind speeds. The results show that the levelised cost of energy may be significantly decreased in future due to the fact that the cost of PV modules is progressively reducing. Payments for CERs under CDM mechanism of the Kyoto Protocol would lower the levelised cost of energy further. The Project was found to be feasible.I was a distance student and did the presentation online via centra.
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Cortese, Ignacio. "Comparison of Utility-scale Solar Power Generation Technologies in Yunnan Province, China." Thesis, KTH, Kraft- och värmeteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217922.
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Udayakanthi, Geetha. "Design of a Wind-Solar Hybrid Power Generation System in Sri Lanka." Thesis, KTH, Kraft- och värmeteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-179398.
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Energy is critical to the economic growth and social development of any country. Indigenous energy resources need to be developed to the optimum level to minimize dependence on imported fuels, subject to resolving economic, environmental and social constraints. This led to a boost in research and development as well as investment in renewable energy industry in search of ways to meet energy demand and to reduce dependency on fossil fuels. Wind and solar energy are becoming popular owing to abundance, availability and ease of harnessing for electrical power generation. This thesis focuses on an integrated hybrid renewable energy system consisting of wind and solar energy. Sri Lanka, a small island located south of the Indian subcontinent, has been blessed with renewable energy sources. According to the national energy policy a 10% share is targeted from NCRE (Non-Conventional Renewable Energy) sources by 2015 and 20% by 2020 out of total electricity generation in Sri Lanka. This thesis provides an insight into the energy scenario and present situation of renewable energy development in Sri Lanka. According to wind and solar potential maps of Sri Lanka which were developed by NREL in 2003, many parts of the country have potential to developed economic power generation. Through these maps locations were identified where both wind and solar potential is high. A detailed study was carried out in these locations with real time field data. The focal point of this thesis is to propose and evaluate a wind-solar hybrid power generation system for a selected location. Grid tied power generation systems make use of solar PV or wind turbines to produce electricity and supply the load by connecting to grid. In this study, HOMER (Hybrid Optimization Model for Electric Renewables) computer modeling software was used to model the power system, its physical behavior and its life cycle cost. The hybrid power system was designed for Hambantota District in Southern Sri Lanka. Through the simulation process, installation of 8 numbers of 850kW wind turbines and 1MW solar PV modules were identified as most economical to supply average of 3MW load connected to grid where the simple payback period of the system was 3.4 years.
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Pappu, Venkata Ajay Kumar. "Implementing frequency regulation capability in a solar photovoltaic power plant." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2010. http://scholarsmine.mst.edu/thesis/pdf/Pappu_09007dcc807d51ca.pdf.
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Thesis (M.S.)--Missouri University of Science and Technology, 2010.Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed July 19, 2010) Includes bibliographical references (p. 88-90).
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Shaheen, Momtaz. "Analytical model of an n+-p-p+ concentrator solar cell." Virtual Press, 1988. http://liblink.bsu.edu/uhtbin/catkey/539622.
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Concentrator solar cells operate under the conditions of non-uniform illumination and varying spectral content of incident sunlight. To predict the performance of such cells, an analytical model must account for varying carrier photogeneration rates within the cell. Further, the back surface junction fabricated to reduce recombination at the back contact must be included in the analysis.Most models of n+-p-p+ cells assume uniform generation rates within individual layers. In this study, a one-dimensional n+-p-p+ concentrator solar cell is modeled for all levels of illumination of incident sunlight. The photocarrier generation rate is considered as non-uniform in each layer of the cell. An absorption model is incorporated to permit the application for various spectral mixes of incident sunlight. The model also includes the effects of finite surface recombination velocities at the surfaces. Carrier transport equations for the three layers of the cell are developed and solved for the excess carrier concentrations under the assumptions of the model. Junction current density-voltage relationships for the two junctions of the cell are derived. The use of the current density equations in the evaluation of cell performance is discussed.Department of Physics and Astronomy
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Kheder, Abdul-Sameei Yaseen. "Starting high inertia, high friction loads from limited power sources." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184455.
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At starting, electrical motors require large power and current. This may not be a problem in a large electrical system but it may be very severe for a limited power source like a solar array. If a direct approach is taken the array rating must be 5-6 times the motor rating in order to start the motor and its high inertia high friction load. Batteries have been used to store energy and supply that energy for starting. Batteries need maintenance and their low efficiency is a problem too. In this study a new type of controller has been suggested and developed for the use with D.C. motors. Computer simulation showed promising results. The controller uses the array power, which is equal to the rated power of the motor, for starting and for running condition. Experimental results showed that the theoretical results are applicable.
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Sana, Peyman. "Design, fabrication and analysis of high efficiency multicrystalline silicon solar cells." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/15039.
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Borja, Ralph, Curtis Austin, and Jeffery Phillips. "Operation Solar Eagle: a study examining photovoltaic (PV) solar power as an alternative for the rebuilding of the Iraqi electrical power generation infrastructure." Monterey, California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/10025.
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MBA Professional ReportThe purpose of this project is to examine the cost and feasibility of using photovoltaic solar power to assist in the rebuilding of the Iraqi infrastructure. The project will examine available solar equipment and technologies coupled with requirements for operation, installation and maintenance of such systems. The report begins with an analysis of the current state of the Iraqi infrastructure with special emphasis placed on identifying potential candidates for initial solar PV system installation. Next, the report addresses available commercial solar equipment and emerging technologies that enhance such systems. This section will address areas including installation, operation, maintenance, and durability. Finally, the report will conclude with a cost estimate for using solar PV systems in the rebuilding of Iraq. At the conclusion of the project, information will be available for decision makers to include as part of an operations order or to attach as an annex to an existing operations order.
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Fink, Jacob Eugene. "Fine Line Metallization of Silicon Heterojunction Solar Cells via Collimated Aerosol Beam Direct Write." Thesis, North Dakota State University, 2012. https://hdl.handle.net/10365/26656.
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Solar energy has come to the forefront as a scalable and largely underutilized renewable energy resource. The current cost of solar electricity, namely from photovoltaics, along with other logistics factors, has prevented the widespread adaptation of the technology. A key determinant of efficiency and cost for a solar cell is the current collector grid. This work presents the Collimated Aerosol Beam Direct Write (CAB-DW) system as a non-contact printing method that can achieve current collector grid finger widths of less than 10 ?m which are amenable to decreasing both resistive and optical losses. The ability to produce high aspect ratio grid fingers, and deposit optimized grid structures on high efficiency SHJ solar cells using silver nanoparticle inks is also demonstrated. A decrease in shadowing and via profile modification of the grid fingers is presented, along with a study of aging and degradation of electrical properties within silver nanoparticle inks.
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Rwezuva, Onekai Adeliade. "Solar Augmentation of Process Steam Boilers for Cogeneration." Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/33898.
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In this study, the techno-economic feasibility of converting an existing process steam plant into a combined heat and power plant, using an external solar thermal field as the additional heat source was studied. Technical feasibility entailed designing a suitable heat exchanger, which uses hot oil from the solar field to raise the steam conditions from dry saturated to superheated. The solar field was sized to heat a selected heat transfer fluid to its maximum attainable temperature. A suitable turbine-alternator was chosen which can meet the required plant power demand. For this to be a success, the processes which require process steam were analysed and a MathCAD model was created to design the heat exchanger and check turbine output using the equations adapted from various thermodynamics and power plant engineering texts, together with the Standards for the Tubular Exchanger Manufacturer's Association. The U.S. National Renewable Energy Laboratory system advisor model was used to size the suitable solar field. A financial model was developed in Excel to check the economic feasibility of the project, using discounted payback period as the economic indicator. It was found out that amongst loan interest rates, variation of system output and the electricity output, the profitability of the project was largely influenced by the electricity tariff. An optimum size for the heat exchanger of 30ft was established from the sensitivity analysis and it was concluded that the project is currently not economically viable on an independent investor financing model, unless either the electricity tariff improves or the solar thermal energy and turbine technology costs decrease.
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Stephanos, Cyril [Verfasser], and Jochen [Akademischer Betreuer] Mannhart. "Thermoelectronic Power Generation from Solar Radiation and Heat / Cyril Stephanos. Betreuer: Jochen Mannhart." Augsburg : Universität Augsburg, 2013. http://d-nb.info/107770254X/34.
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Vahland, Sören. "Analysis of Parabolic Trough Solar Energy Integration into Different Geothermal Power Generation Concepts." Thesis, KTH, Kraft- och värmeteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-129093.
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The change in climate as a consequence of anthropogenic activities is a subject ofmajor concerns. In order to reduce the amount of greenhouse gas emissions inthe atmosphere, the utilization of renewable, fossil-free power generationapplications becomes inevitable. Geothermal and solar energy play a major rolein covering the increased demand for renewable energy sources of today’s andfuture’s society. A special focus hereby lies on the Concentrating Solar Powertechnologies and different geothermal concepts. The costs for producingelectricity through Concentrating Solar Power and therefore Parabolic Trough Collectorsas well as geothermal conversion technologies are still comparatively high. Inorder to minimize these expenses and maximize the cycle’s efficiency, thepossible synergies of a hybridization of these two technologies becomeapparent. This thesis therefore investigates the thermodynamic and economicbenefits and drawbacks of this combination from a global perspective. For that,a Parabolic Trough Collector system is combined with the geothermal conversionconcepts of Direct Steam, Single and Double Flash, Organic Rankine as well asKalina Cycles. The solar integrations under investigation are Superheat,Preheat and Superheat & Reheat of the geothermal fluid. The thermodynamicanalysis focuses on the thermal and utilization efficiencies, as well as therequired Parabolic Trough Collector area. The results indicate that in the caseof the Superheat and Superheat & Reheat setup, the thermal efficiency canbe improved for all geothermal concepts in comparison to their correspondinggeothermal stand-alone case. The Preheat cases, with the major contributionfrom solar energy, are not able to improve the cycle’s thermal efficiencyrelative to the reference setup. From an exergy perspective the findings varysignificantly depending on the applied boundary conditions. Still, almost allcases were able to improve the cycle’s performance compared to the referencecase. For the economic evaluation, the capital investment costs and thelevelized costs of electricity are studied. The capital costs increasesignificantly when adding solar energy to the geothermal cycle. The levelizedelectricity costs could not be lowered for any hybridization case compared tothe reference only-geothermal configurations. The prices vary between20.04 €/MWh and 373.42 €/MWh. When conducting a sensitivity analysison the solar system price and the annual mean irradiance, the Kalina Superheatand Superheat & Reheat, as well as the Organic Rankine Preheathybridizations become cost competitive relative to the reference cases.Concluding, it is important to remark, that even if the hybridization of the ParabolicTrough and the different geothermal concepts makes sense from a thermodynamicperspective, the decisive levelized costs of electricity could not be improved.It is, however, possible that these costs can be further reduced under speciallocal conditions, making the addition of Parabolic Trough solar heat tospecific geothermal concepts favorable.
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Sun, Amy (Amy Teh-Yu). "Field fabrication of solar-thermal powered stream turbines for generation of mechanical power." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37400.
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Thesis (S.M.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2006.Includes bibliographical references (p. 65).
Providing adequate energy to developing countries is one of the greatest global technical challenges today. Fabrication is undergoing a revolution that parallels the digitization of computation and communications. Emerging affordable, "desktop" fabrication tools are providing the precision and repeatability necessary for regular people to design, manufacture, and install a system to convert solar thermal energy to useful work. In the spectrum of devices that use solar energy, this field-fabricated system exists in a space between crude solar cookers for heating food and complex, expensive photovoltaic cells. Computer control and high precision allows regular people to experimentally converge on a locally-appropriate design and implementation to solve the challenge of providing energy. This thesis describes a field producible, small-scale turbine that uses solar thermal energy to provide mechanical energy. I investigate a solar thermal steam-driven turbine system and build and evaluate several versions in field fabrication lab locations around the world. I consider the efficacy of deployment in rural developing areas.
by Amy Sun.
S.M.
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Luta, Doudou Nanitamo. "Modelling of hybrid solar wind integrated generation systems in an electrical distribution network." Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/1177.
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Thesis submitted in fulfilment of the requirements for the degree
Master of Technology: Electrical Engineering
in the Faculty of Engineering
at the Cape Peninsula University of Technology
2014The research in this thesis deals with the application of Model Based Systems Engineering (MBSE) practices in the modelling of power systems. More particularly, we have presented the modelling hybrid photovoltaic wind integrated in an electrical distribution network using SysML (System Modelling Language) which is a modelling language in support of MBSE. MBSE refers to a formalised practice of systems development through the application of modelling principles, methods, languages and tools to the entire lifecycle of a system. Generally speaking, the modelling of power systems is performed using software such as Matlab Simulink, DigSilent, PowerWorld etc. These software programs allow modelling of a system considering only a specific viewpoint, depending on the objective that is to be assessed. The advantage of the SysML over the above mentioned modelling languages lies from the fact that SysML includes different viewpoints of a system. These views are known as the Four Pillars of SysML. Pillar One refers to the requirements of a system and includes all the functional and non-functional requirements. Pillar Two deals with the structure representation of a system by considering all its subsystems and their different connections. Pillar Three considers the behaviour of a system and includes its activities, sequences and different states. The last Pillar includes the detailed characteristics, physical laws and constraints on the system. The main objectives of this research are the development of models which will include: the system’s requirements; the system’s structure representation in term of different entities involved and the relationship between them; the system’s behaviours in terms of activities in different cases considered and transitions from one state to another as well as the interaction between the system and all the stakeholders. Keywords: Model Based Systems Engineering (MBSE), System Modelling Language (SysML), Renewable Energy systems, Hybrid power systems, photovoltaic systems, wind power systems.
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Hagström, Emil. "Grid planning with a large amount of small scale solar power." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-199060.
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With an increasing interest for renewable power, photovoltaics (PV) have becomemore and more common in the distribution network. If a customer wants to install aPV system, or another type of distributed generation (DG), the distribution systemoperators (DSO) needs a good way to determine if it the grid can handle it or not. InSweden, a guideline to aid the DSO was published in 2011. However, this guidelineonly considers one connection without considering other DG units. This project isabout developing new guidelines for DG connections in grids with a large number ofDG units. Based on a literature study it has been concluded that one of the mostcritical issue is over-voltage, which is the main focus of this project. Two new methods have been developed; the first proposed method is based onneglecting reactance and losses in the grid, a simple linear relationship between thevoltage level, the resistance in the lines, and the installed power is obtained. Thisrelationship is then used to calculate the voltage level at critical points in the grid. Thesecond method is to find the weakest bus, with a connected DG unit. By assumingthat all power is installed at that point we get a very simple guideline; it is veryconservative but can be used before the first method. A simulation tool has been developed in order to analyze the voltage level in grids forvarious cases with connected DG units. The simulated results have proven that theproposed guidelines are, when considering voltage issues, very reliable and can beuseful. However, further work needs to be done to ensure that other problems donot occur.
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Schooley, David C. "Unit commitment and system reliability in electric utility systems with independent wind and solar generation." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/12917.
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Ropp, Michael Eugene. "Design issues for grid-connected photovoltaic systems." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/13456.
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Nakayashiki, Kenta. "Understanding of defect passivation and its effect on multicrystalline silicon solar cell performance." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19854.
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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.Committee Chair: Dr. Ajeet Rohatgi; Committee Member: Dr. Bernard Kippelen; Committee Member: Dr. Gabriel Rincon-Mora; Committee Member: Dr. Miroslav Begovic; Committee Member: Dr. W. Brent Carter.
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Krishnamurthy, Smitha. "SOLAR AND FUEL CELL CIRCUIT MODELING, ANALYSIS AND INTEGRATIONS WITH POWER CONVERSION CIRCUITS FOR DISTRIBUTED GENERATION." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3501.
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Renewable energy is considered to be one of the most promising alternatives for the growing energy demand in response to depletion of fossil fuels and undesired global warming issue. With such perspective, Solar Cells and Fuel Cells are most viable, environmentally sound, and sustainable energy sources for power generation. Solar and Fuel cells have created great interests in modern applications including distributed energy generation to provide clean energy. The purpose of this thesis was to perform a detailed analysis and modeling of Solar and Fuel cells using Cadence SPICE, and to investigate dynamic interactions between the modules and power conversion circuits. Equivalent electronic static and dynamic models for Solar and Fuel Cells, their electrical characteristics, and typical power loss mechanisms associated with them are demonstrated with simulation results. Power conversion circuits for integration with the dynamic models of these renewable low voltage sources are specifically chosen to boost and regulate the input low dc voltage from the modules. The scope of this work was to analyze and model solar and fuel cells to study their terminal characteristics, power loss mechanisms, modules and their dynamics when interfaced with power converters, which would lead to better understanding of these renewable sources in power applications.M.S.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering MSEE
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Mauger, Léo. "Generation of wind speed and solar irradiance time series for power plants with storage." Thesis, KTH, Energiteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-181923.
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Sizing renewable energy power plants with storage devices needs new resource assessment. Global amount of energy available has to be replaced by time series to depict the resource as a function of time. This paper introduces methodology to generate time series for wind speed and solar irradiance with a granularity between 10minutes and 1seconde. Ground measurements and macro-date from satellite imagery are analyzed and processed to obtain long-term site-specific time series. Because renewable energy forecasting is a growing concern, a second part of the work presents how to modify previously generated profiles in order to obtain forecasts with an expected error.
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Qin, Ji Yun. "Study on configuration and operation strategies of solar aided power generation plant." Thesis, 2017. http://hdl.handle.net/2440/113261.
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This thesis presents the outcomes of a study on the impact of configuration and operation strategies on the techno-economic performance of a Solar Aided Power Generation (SAPG) plant. An SAPG plant is a solar thermal hybrid power system. In such a power system, the solar thermal energy is used to displace the heat of the extraction steam in a regenerative Rankine cycle (RRC) power plant to preheat the feedwater to the boiler. The displaced extraction steam can, therefore, expand further in a steam turbine to generate power. The research and development of SAPG technology started in the 1990s. However, previous studies mainly focus on identifying the advantages of SAPG technology, design and optimising the design of the SAPG plants, and comparing the economic performance of SAPG performance with other power generation technologies (e.g. solar alone power generation). Few studies on the operation of SAPG plants have been undertaken before. There are, therefore, four research questions that remain to be answered: ◆ How many possible SAPG plant configurations to connect the RRC plant and the solar field are available, and what is the impact of combinations of these possible configurations and operation strategies on adjusting the displaced extraction steam’s flow rate on an SAPG plant’s technical performance? ◆ Should only concentrating solar collectors be used in SAPG plants to achieve better plant performance? ◆ What are the impacts of the operation of non-displaced feedwater heaters on the SAPG plant’s performance? ◆ How should an SAPG plant be operated under different market conditions in order to maximize the plant’s economic returns? Therefore, the aim of this research is to advance the use of SAPG technology from the design and optimisation stages to its operation stage by addressing the four research questions above. A pseudo-dynamic thermodynamic and economic model has been developed, validated and used as a tool in this study. In this model, the performance of an SAPG plant is simulated at a series of time intervals (i.e. 1 hour intervals). At each time interval, it is assumed that the SAPG plant is operated in a steady state. Furthermore, this model can simulate an SAPG plant with all its proposed configurations/structures and operation strategies/modes. In addition, a criterion that can be used to evaluate the economic profitability of an SAPG plant with different operation modes has been proposed. Based on this criterion, an optimal operation mode that can maximise plant’s economic profitability will be determined and adopted to operate the plant. The main conclusions drawn from this research are: ◆ An SAPG plant’s technical performance is dependent on the combination of the plant’s configuration and operation strategies. There are 12 such combinations identified for SAPG plants. It is found that combinations 2, 5 and 8 (detailed in Chapter 3) can enable the plant to achieve the maximum annual technical performance. ◆ Non-concentrating solar collectors can and should be used in SAPG plants as they are superior to concentrating collectors in terms of net land based solar to power efficiency and even economics in some cases. ◆ The operation of non-displaced feedwater heaters (i.e. adjusting the extraction steam flow rate to the non-displaced feedwater heaters when the solar input changes) does have an impact on an SAPG plant’s technical performance. It was found that a “constant temperature” operation of the non-displaced feedwater heaters is generally more effective than a “constant mass flow” operation that is, however, easier to manage. The only exception for this finding is in rich solar resources areas. ◆ An SAPG plant can be operated in either power boosting or fuel saving mode at any given time. Different modes would give the SAPG plant different economic benefits under given market conditions (i.e. for on-grid tariffs and fuel prices). A new criterion termed “Relative Profitability” (RP) which links the plant’s profitability with its operation mode has been proposed and developed in this study. Based on this criterion, a “mixed mode” operation has been developed: at a given time interval (e.g. 1 hour) the plant should be operated in either power boosting or fuel saving mode: whichever gives the higher RP. Through case studies, it has been demonstrated that mixed mode operation could guarantee the best economic outcomes for the SAPG plants over the single (power boosting or fuel saving) mode of operation in all kinds of market conditions. This thesis has been submitted in publication format, as it includes journal articles that have either been published or are currently under review by international, reputable journals. The four articles that have been chosen here best demonstrate the outcomes of the study and so form the main part of this thesis. Additional background information and a literature review are provided to establish the context and significance of this work.Thesis (Ph.D.) (Research by Publication) -- University of Adelaide, School of Mechanical Engineering, 2017.
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Lujara, Nelson Kakuru. "Computer aided design of systems for solar powered water pumping by photovoltaics." Thesis, 2012. http://hdl.handle.net/10210/6537.
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D.Ing.Low system efficiency is a critical problem in photovoltaic (PV) applications due to low efficiency of solar cells. Despite this shortcoming, stand-alone PV systems, have proven to be economical and reliable choices in some applications such as telecommunications, vaccine refrigeration and water pumping in remote locations. In this study, CAD algorithms for the design of PV water pumping systems have been developed with the objective of maximizing the conversion efficiency from the solar irradiation to the potential energy of water by taking into account the variations in the pumping head. The study starts by developing loss models of various sub-systems in the photovoltaic dc and ac motor drive water pumping systems. Using MathCad, these models are then used in the simulation of the system. The simulation results are verified experimentally using their equivalent circuit configurations. The efficiency of the array, the pump and the motor are found to be the most critical parameters for the performance of the systems. The efficiencies of other components, such as the inverter, have also been shown to have a significant effect. The study has shown that for operation at the maximum power point, the inclusion of a maximum power tracker is necessary in a dc motor drive system but may be eliminated in PWM inverter-fed induction motor drive systems through proper matching of the system components. The study has further shown that matching of the drive system and the load with the insolation is essential, since maximum system efficiency occurs at a specific head, which varies as the insolation changes. Prior investigation of site insolation variations is therefore a critical requirement.
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"Concentrated Solar Power Generation." Master's thesis, 2013. http://hdl.handle.net/2286/R.I.20956.
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abstract: Solar power generation is the most promising technology to transfer energy consumption reliance from fossil fuel to renewable sources. Concentrated solar power generation is a method to concentrate the sunlight from a bigger area to a smaller area. The collected sunlight is converted more efficiently through two types of technologies: concentrated solar photovoltaics (CSPV) and concentrated solar thermal power (CSTP) generation. In this thesis, these two technologies were evaluated in terms of system construction, performance characteristics, design considerations, cost benefit analysis and their field experience. The two concentrated solar power generation systems were implemented with similar solar concentrators and solar tracking systems but with different energy collecting and conversion components: the CSPV system uses high efficiency multi-junction solar cell modules, while the CSTP system uses a boiler -turbine-generator setup. The performances are calibrated via the experiments and evaluation analysis.Dissertation/Thesis
M.S. Electrical Engineering 2013
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CHEN, JING YI, and 陳景意. "Benefit Evaluation of Solar Power Generation." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/39wk55.
Full textAbstract:
碩士中華科技大學
機電光工程研究所碩士班
107
Taiwans power shortage is becoming more serious. Especially in the northern region, the lack of electricity is more serious due to the busy population, economy and business district. At present, the anti-nuclear voice gradually pays attention to the nuclear safety issue. The government encourages the New Energy Policy and Energy Department to issue the latest energy sales and purchase plan on January 8, 107, the Republic of China. This paper considers the latest energy purchase price standards of the Energy Bureau divided into the north (15% of Miaoli, Yilan, and Hualien) and the south. This paper discusses the efficiency of solar power system installation and evaluation, and mainly analyzes the related instrumentation equipment and power generation of solar cell installation. This paper uses the actual amount of sunshine and temperature data of the weather station to evaluate the basis for setting up the solar energy system. It can be used as a reference for solar power generation and estimate the recovered electricity price based on the latest price of electricity purchased to evaluate the construction benefits. This paper evaluates the benefits in three scenarios: 1. The depreciation rate is not considered. 2. Consider the depreciation rate. 3. Recovery benefits of financing interest flattening. The results of the research show that the recovery in the northern region is slow. The recycling period in the southern region is early. Keywords: electricity purchase, solar photovoltaic system, depreciation rate, financing, benefit
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Chang, Chia-Hao, and 張家豪. "Solar Photovoltaic Power Generation Efficiency Analysis." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/24w75a.
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Wang, Cyun-Siang, and 王群翔. "Forecasting Solar Power Generation by Machine Learning：Case of Longjing Solar Power Plant." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/adz3e9.
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Tsai, Jie-Hao, and 蔡介豪. "Solar Power Generation System with Multi-Level Power Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/mhbk3c.
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碩士國立高雄海洋科技大學
微電子工程研究所
103
In this thesis, a variable-level solar power generation system is developed. The developed variable-level solar power generation system is composed of a solar cell array, a variable-level DC-AC power converter and a DC-DC power converter. The variable-level DC-AC power converter is configured by a dual buck power converter and a full-bridge power converter, and it contains two DC input ports and an AC input port. The variable-level DC-AC power converter converts the DC energy from two DC input ports to an AC energy injected into the utility system through its AC output port. The output current of variable-level DC-AC power converter is sinusoidal and in phase to the voltage of utility system such that the power factor is unity. One of the DC input ports of variable-level DC-AC power converter is directly connected to the solar cell array, and the other one is connected to the solar cell array through the DC-DC power converter. Accordingly, only part of output power of the solar cell array is converted through two power conversion stage. The voltage for one of the DC input ports of variable-level DC-AC power converter is directly equal to the output voltage of solar cell array. Since the output voltage of solar cell array is varied dependent on the temperature and the light intensity, the variable-level DC-AC power converter is controlled to generate an output voltage with five voltage levels or seven voltage levels. Since the developed variable-level DC-AC inverter contains only six power electronic switches, the circuit configuration is simplified. Moreover, the output filter inductor is reduced and the switching power loss is decreased due to the multi-level output voltage. A digital signal processor based prototype is developed and tested to verify the performance of the proposed new renewable solar power system.
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Chang, Chien Shih-Chun, and 張簡士俊. "Analysis of Transformerless Solar Power Generation System." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/21801579740646301804.
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碩士國立高雄海洋科技大學
微電子工程研究所
103
The grid-connected power converter is used as an interface between the solar cell array and utility grid. The grid-connected power converter converts the DC power generated from the solar cell array to an AC power injected into the utility grid. However, a parasitic capacitor is induced between the terminals of solar cell array and ground, and it will result in a leakage current while a high-frequency pulse voltage is generated by the grid-connected power converter. The leakage current will result in the problems of safety, electromagnetic interference (EMI), current distortion and extra power loss. In general, an isolation transformer is used to solve the problems of leakage current. However, the isolation transformer will result in bulky volume, high cost, and poor efficiency. Several grid-connected power converters have been developed for the transformerless solar power generation system to solve the problems of leakage current. The developed grid-connected power converters can be divided into circuit decoupling topology and common-mode voltage clamped topology. In this thesis, the transformerless solar power generation system is discussed, and computer simulation is made to verify the performance of transformerless solar power generation system.
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CHEN, YUNG-LIN, and 陳永霖. "High Efficiency Five-Level Solar Power Generation System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/27314824991061223564.
Full textAbstract:
碩士國立高雄海洋科技大學
微電子工程研究所
105
This thesis proposes a new high-efficiency solar power generation system. The proposed high-efficiency solar power generation system is composed of a solar cell array, a DC-DC power converter and a new five-level DC-AC inverter. A boost power converter is applied for the DC-DC power converter, and it is only operated when the magnitude of the grid voltage is greater than the voltage of solar cell array. The new five-level DC-AC inverter is composed of a selection switch set and a full-bridge DC-AC power converter. The selection switch set is composed of a fast diode and a power electronic switch, and it determines the DC bus of full-bridge DC-AC power converter connecting to the solar cell array or the output of the boost power converter. Accordingly, the selection switch set will generate a two-level DC voltage supplying to the full-bridge DC-AC power converter, and the two-level DC voltage is further converted to a five-level AC voltage through the full-bridge DC-AC power converter. The output current of solar power generation system is controlled to be sinusoidal and in phase with the grid voltage. Since the proposed high-efficiency solar power generation system contains only six power electronic switches, the circuit configuration is simplified. In addition, partial power from the solar cell array is converted to AC power using only the new five-level DC-AC inverter, so the power efficiency is increased. A prototype is developed to validate the performance of new high-efficiency solar power generation system.
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Guo, Jing-Huei, and 郭菁輝. "An Integrated Experiment System for Solar Power Generation." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/96475845844562790269.
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碩士北臺灣科學技術學院
機電整合研究所
99
The developments and usages of green energy are important national policies. The green energy applications are an important part for the education of electrical and mechanical engineering. To enhance the efficiency of the teaching of green energy applications, this thesis uses MATLAB/GUI functions to develop a human-machine interface and design the screen for use to integrate different solar power generation experiments in the same environment. Have to do this, users can execute experiments without operating MATLAB/Simulink in detail, and can reduce the barriers for solar power experiments, increase the operating convenience, and upgrade the benefits of existing solar power equipment.
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Chou, Chiawei, and 周佳緯. "Study and Implementation of Solar Power Generation System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/5597z9.
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碩士國立高雄海洋科技大學
微電子工程研究所
101
In this thesis, a new solar power generation system is proposed. The proposed new solar power generation system is composed of a solar cell array, a DC/DC power converter and a seven-level DC-AC inverter. The DC/DC power converter integrates a DC-DC boost converter and a forward converter to convert the output voltage of solar power source to two independent voltages which become the multiple relations. The seven-level DC-AC inverter is configured by a capacitor selection circuit and a full-bridge power converter connecting in cascade. The capacitor selection circuit converts the two output voltages of DC-DC power converter to a three-level DC voltage, and the full-bridge power converter further converts this three-level DC voltage to a seven-level AC voltage synchronous with the utility voltage. In this way, the new solar power generation system will be controlled to generate a sinusoidal output current injecting into the utility. The sinusoidal output current of new solar power generation system is in phase with the utility voltage so as to perform unity power factor. Since the proposed seven-level DC-AC inverter contains only six power electronic switches, the circuit configuration is simplified. Only one power electronic switch is switched in high frequency at the same time to generate the seven-level output voltage; thus reducing the switching power loss and improving the power efficiency. Moreover, the inductance of output filter inductor is also reduced due to the seven-level output voltage. A digital signal processor based prototype is developed and tested to verify the performance of the proposed new renewable solar power system.
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Li, Chun-Wei, and 李俊緯. "Forecasting Solar Power Generation by LSTM Neural Networks." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/fx994p.
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碩士大同大學
電機工程學系(所)
107
Solar photovoltaic (PV) generation has received great attention in recent years due to the promotion of green environment awareness. Accurate forecasting of solar power benefits the preparation for switching other renewable energies into the power grids when PV power becomes low. In particular, the harmful consequence from the large peak and off-peak gaps of the so-called “duck curve” for PV power can be mitigated. Motivated by the fact that the contingency reserve typically requires thirty to sixty minutes to start up, we mainly focus on the PV power prediction at the hourly level. Among numerous studies in the literature dealing with solar power forecasting via various machine learning methods, the application of long short-term memory (LSTM) on hourly PV power prediction has been recently proposed to capture both hourly patterns in a day and seasonal patterns across days. For hourly prediction, however, we argue that the contribution of seasonal factors might be marginal since the correlation of meteorological information between days is much higher than between years. In this paper, we consider the LSTM-based hourly PV power prediction with the daily factor (24 hours) instead of the seasonal factor (day and month) and improve the pattern learning by selecting the highly-effective features toward the different number of time steps. This design is to enhance the information of time-dependency between each set of training input which is crucial for hourly prediction. By using the real-world data, the experimental results show that the accuracy of hourly PV power prediction can improve from 92–95% to 94–95.5% in terms of coefficient of determination (R2) whilst using the same dataset.
49
Chen, Chun-Chuan, and 陳俊全. "Multi-input Power Converter for Solar Energy and Wind Power Generation." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/53287855677889544654.
Full textAbstract:
碩士國立高雄第一科技大學
電子工程所IC設計及綠色能源產業研發碩士專班
98
In this paper a modified-forward multi-input converter (MFMIC) for renewable energy is proposed, which can not only process solar energy but deal with wind power. The proposed converter is derived from series forward structure to step down voltage for charger systems or dc distribution applications. The MFMIC mainly contains an upper forward, a lower forward, a common output inductor, and a DSP-based system controller. The upper and lower forwards can operate separately or simultaneously to accommodate the variation of atmospheric conditions. Since the MFMIC can process power at interleaving mode, better performance can be achieved and volume is reduced. To draw maximum power from PV panel and wind turbine, perturb-and-observe method is adopted for maximum power point tracking (MPPT). The MFMIC system is constructed, designed, analyzed and simulated. Simulations and experimental results have demonstrated the feasibility of the proposed multi-input converter.
50
Chen, Yan-Ting, and 陳彥廷. "Design and Implementation of Computer Aided Teaching of Solar Energy Generation System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/42841788399851103255.
Full textAbstract:
碩士國立高雄第一科技大學
電子工程系碩士在職專班
105
The building of photovoltaic system was high risk, expensive, and hard to build. Therefore, there was a photovoltaic simulation learning system for students to learn the building process. However the learning system was still high-priced and had certain risks. The thesis used SimMAGIC eBook to set up a photovoltaic simulation learning system, which then students were able to thoroughly practice before processing the actual building of photovoltaic system hardware. As the result, students could prepare every building step, fully understand the electronic component, and develop learning interests. The thesis used 24 students as test subject and divided 24 students into 6 groups, thus 4 students were in a group. The training method was switching the tasks. When one of the groups was practicing simulation wiring and measuring training, the other 20 students used the CAI software developed in the thesis. The CAI software included three line wiring types of photovoltaic system, which were independent operation, grid-connected, and disaster prevention. The students completed CAI tasks and then went on with the actual wiring training in photovoltaic simulation learning system. Through the CAI software, the four sets of photovoltaic simulation learning systems that could only be used by four students for training at the beginning, was then able to let 24 students received training. The practicing amount increased to 20 and reduced 4 million costs for building teaching materials. Moreover, it achieved the cost reduction of 100 thousands for equipment maintenance in a year. To sum up, the effect of CAI photovoltaic system was obvious and the most important part was that it substantially increased the safety during practicing.