Дисертації з теми "Power grid systems"
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Lim, Pei Yi. "Power management strategies for off-grid hybrid power systems." Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/2503.
Повний текст джерелаEl, Zein Musadag. "Off-grid Wind Power Systems: Planning and Decision Making." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-396057.
Повний текст джерелаAlshogeathri, Ali Mofleh Ali. "Vehicle-to-Grid (V2G) integration with the power grid using a fuzzy logic controller." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/20606.
Повний текст джерелаDepartment of Electrical and Computer Engineering
Shelli K. Starrett
This thesis introduces a Vehicle to Grid (V2G) system which coordinates the charging, and discharging among the Electric Vehicles (EVs) and two-test systems, to help with peak power shaving and voltage stability of the system. Allowing EVs to charge and discharge without any control may lead to voltage variations and disturbance to the grid, but if the charging and discharging of the EVs is done in a smart manner, they can help the power network. In this thesis, fuzzy logic controllers (FLC) are used to control the flow of power between the grid and the electric vehicles. The presented work in this thesis mainly focuses on the control architecture for a V2G station that allows for using EVs batteries to help the grid’s voltage stability. The designed controllers sustain the node voltage, and thus also achieve peak shaving. The proposed architectures are tested on 16 -generator and 6-generator test systems to examine the effectiveness of the proposed designs. Five fuzzy logic schemes are tested to illustrate the V2G system’s ability to influence system voltage stability. The major contributions of this thesis are as follows: • FLC based control tool for V2G station present at a weak bus in the system. • Investigate the effect of the station location and voltage sensitivity. • Comparison of chargers providing real power versus reactive power. • Simulation of controller and system interactions in a daily load curve cycle. Keywords: State of Charge (SOC), Electric Vehicle (EV), Fuzzy Logic Controller (FLC), Vehicle to grid (V2G), and Power System Voltage Stability.
Zabihi, Sheikhrajeh Nima. "Vehicle-to-grid (V2G) and grid conditioning systems." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3426634.
Повний текст джерелаIl termine Vehicle-to-Grid (V2G) si riferisce alla tecnologia che permette uno scambio di potenza bidirezionale tra la rete elettrica e le batterie dei veicoli elettrici di tipo plug-in (PEV). La tecnologia V2G può essere un elemento chiave della rete intelligente, che può utilizzare le batterie dei veicoli come un sistema di accumulo locale. Le batterie dei veicoli possono contribuire alla stabilità della rete e a soddisfare la domanda di energia soprattutto nelle ore di punta. Un PEV ha bisogno di un caricatore bidirezionale per implementare il V2G, e, di conseguenza, gli studi riguardo il loro progetto, la funzionalità e l'efficienza sono del massimo interesse. Questa tesi descrive lo stato dell’arte di questi caricabatteria e tratta alcuni aspetti di un convertitore bidirezionale e alcuni casi di studio relativi a questo argomento. L'obiettivo principale di questo lavoro è di sviluppare il progetto e gli algoritmi di controllo di un caricabatteria bidirezionale con capacità di caricare la batteria di un veicolo plug-in e contemporaneamente di agire come filtro attivo nei confronti della linea di alimentazione. Dopo il primo capitolo introduttivo, nel secondo capitolo viene riportata la terminologia usata in questo campo di ricerca. Vengono anche brevemente descritte diverse strategie intelligenti di ricarica, gli approcci per la realizzazione dei caricabatteria dei PEV e gli standard di ricarica. L’analisi dei vari tipi di caricabatteria viene approfondita nel terzo capitolo. Sono considerati il caricabatteria tradizionale (CBC) con front-end costituito da un raddrizzatore a diodi, il caricabatteria dotato di correttore del fattore di potenza (PFC), il caricabatteria bidirezionale (BBC), e il caricabatteria integrale (IBC). Nel capitolo quattro vengono date le definizioni della potenza elettrica in condizioni non sinusoidali assieme ad alcuni esempi delle inadeguatezze della teoria classica della potenza nel descrivere fenomeni non lineari che si verificano durante il funzionamento di un sistema di potenza. Nel quinto capitolo sono presentati i concetti di base della teoria potenza istantanea attiva e reattiva (nota anche come teoria pq) applicata alla compensazione di sistemi non sinusoidali. Vengono introdotte le definizioni della potenza reale, immaginaria e di sequenza zero e viene mostrato come questa teoria renda agevole la comprensione dei fenomeni causati da tensioni o correnti non sinusoidali. Essa è particolarmente adatta per il progetto di un caricabatteria quando esso viene visto come un condizionatore di potenza. Il capitolo sei è dedicato ai concetti di base dei filtri attivi di tipo shunt. Essi possono svolgere diversi tipi di funzioni, come la compensazione delle armoniche di corrente generate da carichi non lineari impedendo la loro propagazione nella rete. L’algoritmo di compensazione basato sulle potenze definite nel riferimento αβ è molto flessibile e quindi la teoria della potenza istantanea è stata considerata come la base per lo sviluppo del sistema di controllo dei filtri attivi. Alcuni esempi di compensazione descritti nel capitolo precedente sono stati simulati e sono stati riportati i risultati. Nel capitolo sette è considerato il dimensionamento dei dispositivi di potenza che costituiscono il caricabatteria in relazione ai diversi servizi ausiliari che esso può fornire. Sono stati dimensionati in tensione e corrente gli interruttori elettronici di potenza, gli induttori di accoppiamento con la rete e gli altri componenti passivi. Nel capitolo otto viene considerato un caricabatteria che alimenta il proprio carico e contemporaneamente compensa i carichi non lineari connessi nelle vicinanze, costituiti da raddrizzatori. Queste funzionalità aggiuntive in termini di condizionamento della potenza di rete sono state quantificate al fine di determinare la capacità di un caricabatteria costituito da determinati componenti attivi e passivi di supportare la rete svolgendo la funzione di filtro attivo. Nel nono capitolo sono state dimensionate le induttanze di filtro di un caricabatteria per uno specifico caso di studio in cui era richiesta la capacità sia di ricaricare la batteria che di iniettare potenza attiva in rete, sia nel caso di connessione monofase che trifase. La conoscenza dell’ampiezza dell’ondulazione di corrente è un requisito importante per il dimensionamento delle induttanze. Perciò è stato effettuato un calcolo preciso di questa grandezza sia nel caso di un caricabatteria connesso alla rete monofase e operante secondo la tecnica di PWM, sia nel caso di connessione alla rete trifase e adozione della tecnica SVM. Nel capitolo dieci viene considerato un caso di studio riguardo il dimensionamento di un filtro LCL. IL capitolo undici contiene uno studio teorico dei regolatori risonanti. Essi risolvono il problema posto dai convenzionali regolatori PI, che quando sono impiegati per il controllo di grandezze alternate, come accade nel caso delle correnti in un convertitore dc-ac, non sono in grado di annullare l’errore a regime a causa del guadagno finito alla frequenza di funzionamento. Un regolatore risonante presenta invece un guadagno idealmente infinito alla frequenza di funzionamento e quindi garantisce un errore a regime nullo. L’efficacia dei regolatori risonanti è stata verificata per mezzo di simulazioni. Nel capitolo dodici sono riportate le normative riguardanti i connettori, le modalità di ricarica e la connessione dei caricabatteria dei PEV alla rete elettrica. Esse mirano a definire una procedura di ricarica comune a tutti i PEV e tutte le infrastrutture di ricarica, siano esse pubbliche o private.
Ropp, Michael Eugene. "Design issues for grid-connected photovoltaic systems." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/13456.
Повний текст джерелаSteel, Katherine Deaton. "Energy system development in Africa : the case of grid and off-grid power in Kenya." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43840.
Повний текст джерелаIncludes bibliographical references.
This research used a combination of a grounded theory approach and system dynamics to study the electric power system in Kenya and to model the feedback at work in the development of the system. The ethnographic study revealed the challenges faced by consumers in choosing between grid and off-grid power options. Examination of this challenge leads to the hypothesis that competition between the grid and off-grid markets is contributing to the low growth in power consumption and that there is the potential for off-grid to become the dominant option in the future. This theory guided the construction of a system dynamics model focusing on consumers' decision-making and their interaction with the operation of the system. I then used the model to explore the dynamics of the system through scenario testing. There were two key outcomes from the model. The first showed that given the parameters chosen in most cases there is a clearly dominant option, although it changes over time. This finding points to the second key outcome the model, which is that there are realistic scenarios under which off-grid generation will become the dominant supply source. This shift could be induced by either reduced overhead on photovoltaic panels or high fuel prices. The outcomes from this research have implications for future electricity planning in Kenya and elsewhere in Africa. In particular, there is a need to decouple the system from external prices or account for the extreme uncertainty in fuel prices. Given the potential shift to large-scale off grid power generation, energy planners also need to look at options for managing a decentralized power system architecture and consider how to build in options for future reintegration if a large-scale centralized generation source comes online.
(cont.) This research has both academic and applied contributions. On the academic side, it extends the range of engineering systems modeling to include qualitative factors found in an African environment. These factors include the addition of reliability and availability of the electric power grid and the biases in decision-making, which differ from those in industrialized countries. While the model clearly has direct application in Kenya, it was designed with flexibility to be expanded to include other countries and regions and could be a useful tool for understanding policy trade-offs in African electrification planning.
by Katherine Deaton Steel.
Ph.D.
Ramachandran, Jayaraman. "Modelling of grid connected geographically dispersed PV systems for power system studies." Thesis, Northumbria University, 2005. http://nrl.northumbria.ac.uk/3224/.
Повний текст джерелаZhou, Huafeng, and 周華鋒. "Design of grid service-based power system control centers for future electricity systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40687429.
Повний текст джерелаZhou, Huafeng. "Design of grid service-based power system control centers for future electricity systems." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B40687429.
Повний текст джерелаAndreasson, Martin. "Correlated Failures of Power Systems: Analysis of the Nordic Grid." Thesis, KTH, Reglerteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-55844.
Повний текст джерелаMnider, Abdalbaset Mohamed Husian. "Power quality improvements of single-phase grid-connected photovoltaic systems." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3967.
Повний текст джерелаDarbyshire, James. "Multi-function power electronic interface for hybrid mini-grid systems." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/2394.
Повний текст джерелаRoos, Pontus. "A Comparison of Grid-Forming and Grid-Following Control of VSCs." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-413872.
Повний текст джерелаApelfröjd, Senad. "Grid Connection of Permanent Magnet Generator Based Renewable Energy Systems." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-304659.
Повний текст джерелаWind Power
Wave Power
Marine Currnet Power
Storgärd, Per. "Grid Optimization Of Wind-Solar Hybrid Power Plants : Case Study Of Internal Grid Connections." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-319385.
Повний текст джерелаTaylor, Alyse M. "Policy recommendations to realize the objectives of the future electric grid." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/51759.
Повний текст джерелаPrichard, Martin Edward. "SINGLE PHASE MULTILEVEL INVERTER FOR GRID-TIED PHOTOVOLTAIC SYSTEMS." UKnowledge, 2015. http://uknowledge.uky.edu/ece_etds/81.
Повний текст джерелаWang, Zhongkui. "Reactive Power Control and Optimization of Large Scale Grid Connected Photovoltaic Systems in the Smart Grid." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1388764166.
Повний текст джерелаLiu, Kai, and 劉愷. "Optimal dispatch and management for smart power grid." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46336680.
Повний текст джерелаLi, Dan. "Decarbonising future power systems by demand side management in smart grid." Thesis, Durham University, 2019. http://etheses.dur.ac.uk/12988/.
Повний текст джерелаHariri, Abla. "Secure Large Scale Penetration of Electric Vehicles in the Power Grid." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3848.
Повний текст джерелаKeskin, Müge. "Smart Grids and Turkey: An Overview of the Current Power System and Smart Grid Development." Thesis, Uppsala universitet, CEMUS, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-438553.
Повний текст джерелаGjermundrød, Kjell Harald. "Flexible QoS-managed status dissemination middleware framework for the electric power grid." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Dissertations/Summer2006/k%5Fgjermundrod%5F072406.pdf.
Повний текст джерелаAthanasius, Germane Information Technology & Electrical Engineering Australian Defence Force Academy UNSW. "Robust decentralised output feedback control of interconnected grid system." Awarded by:University of New South Wales - Australian Defence Force Academy, 2008. http://handle.unsw.edu.au/1959.4/39591.
Повний текст джерелаAminou, Moussavou Anges Akim. "Modelling and analysis of microgrid control techniques for grid stabilisation." Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/1184.
Повний текст джерелаIn recent times, renewable energy-based distributed generation (DG) has captivated the industrial sector and on a global scale this has become a leading research area. Distributed generation using wind, solar energy or biomass as a source of energy can produce electricity on a small scale. Therefore, there is a strong focus on using renewable energy as a safe alternative source of energy, especially because it can in future play a dominant role in the world’s energy production and help to tackle the increase of global warming caused by fossil energy. However, a major problem facing renewable energies is that they are highly dependent on weather conditions. Since the power generated by DG, as well as consumption, depends on the weather conditions, irregularity of production and consumption leads to frequency and voltage fluctuations, and it can become difficult to determine and monitor consumer usage at any given time. Distributed generation can then be subjected to discrepancies in consumer usage and this can lead to severe overloading. As a result, microgrids powered by DG, operating in a single, stand-alone controllable system mode, face new challenges in terms of balancing a cluster of loads. Balancing a cluster of loads by making sure at all times that the entire system operates without overloading, is an essential requirement for the proper operation of a power system. The microgrid load considered in this project is the sum of sensitive and non-sensitive loads, respectively 5 kW and 100 kW, which constitute load requirement of one village; this total load required by a number of villages is called a cluster load. Depending on the input power generated by a DG-based photovoltaic (PV) system, these loads can be controlled using a logic control switch (LCS). When the power produced is less than the minimum load required by a component of a cluster, overloading occurs. The purpose of using an LCS is to ensure that a stable system is maintained under various loads and resource conditions. An LCS is used to continuously monitor and adjust load through circuit breakers. It is a good alternative to load balancing for a cluster of villages in rural area where a microgrid is operating in stand-alone mode. The focus of this research is to design a photovoltaic system with a maximum capacity of 1 MW providing power to a cluster of rural villages, and operating in stand-alone mode, and then to apply different control techniques (droop control, dq0 reference frame + proportional integral (PI) controller, and PI controller alone) at the inverter terminal of the PV system, in order to evaluate the stability of the output voltage. Another goal of the research is to develop an energy management system (EMS) algorithm to support the PV system in reducing loads. Therefore, a iii stable system under various load and resource conditions, as well as suitable control mechanisms are required to model a PV system. There is a need for the modelling of a PV array using a physical modelling block in MATLAB (SIMULINK) software. The state flow provided by SIMULINK is used in this project to develop an algorithm for load balancing. The state flow gives possibilities of modelling complex algorithms by combining graphical and tabular representations to create sequential decision logic, derived from state transition diagrams and tables, flow charts and truth tables. Furthermore, the design of a microgrid using photovoltaic DG and an energy management system, has been developed. The present work mainly consists of a stand-alone microgrid operation, where the power generated must be equal to the load power. In addition, different control methods, consisting of a dq0 reference frame + PI controller, are analysed at the invertor terminal. Subsequently an LCS algorithm is developed; this is required to maintain the system within certain limits and prevents overloading. LCS algorithms are based on a flowchart and allow switching automatically selected loads, depending on the power (solar radiation) available. In addition, a flow chart provides an easy way of using a graphical transition state and state chart to establish a set of rules for the system. The simulation results show that both droop control and a dq0 reference frame + PI controller are much better than a PI controller alone; these results also compared well with similar studies found in the literature. Also, these results are further improved with an EMS in order to maintain the output voltage of the microgrid, by switching on and off certain loads depending on the input power. The modelling of the microgrid using DG, based on photovoltaic systems with a maximum capacity of 1 MW, supports and improves the PV system by reducing loads. Moreover, droop control, and dq0 transformation + PI control present a better result than PI controller alone.
Schmitt, Andreas Joachim. "Power System Parameter Estimation for Enhanced Grid Stability Assessment in Systems with Renewable Energy Sources." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/83459.
Повний текст джерелаPh. D.
Raji, Atanda Kamoru. "Performance evaluation and improvement of grid-connected technology." Thesis, Cape Peninsula University of Technology, 2012. http://hdl.handle.net/20.500.11838/1198.
Повний текст джерелаThe confluence of the limited resources of fossil fuels (e.g. coal, oil and natural gas), environmental degradations leading to climate change, security of supplies and fossil fuels high costs have demanded a tremendous efforts on humanity to seek for a sustainable and unlimited natural energy sources. Amongst these renewable energy sources stands out solar energy because of its ubiquitousness. Solar energy is converted to DC electricity by the photovoltaic effect. Photovoltaic (PV) power systems installed in commercial and industrial buildings are a good example of distributed power generation. Here the energy consumption and production match and thus electricity taken from the grid during daytime peak hours can be reduced. This is beneficial as the transmission losses in the grid are avoided and also transmission need is reduced. The cost effectiveness of a solar energy system has hindered its wide adoption and deployment in terms of the initial capital cost even though it has a zero energy cost and very minimal operating and maintenance costs. Different governments have instituted many financial incentives for fast adoption of PV systems for both residential and commercial applications. However, all these incentives are not sustainable in the longer term forecast. For PV system to attain grid parity requires more than unsustainable approach of many governments providing time limited subsidies. The technical solution to the problem is to reduce the overall system cost through technical innovations. One such method is the adoption of transformerless inverter technology as the grid interface system. Transformerless inverter topology provides galvanic isolation through innovative inverter topology and switching strategies that eliminates problems created by not employing the service of transformer.
Johansson, Jonatan. "COUNTERMEASURES AGAINST COORDINATED CYBER-ATTACKS TOWARDS POWER GRID SYSTEMS : A systematic literature study." Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-17715.
Повний текст джерелаAnttila, Sara. "Power control strategies for renewable energy systems : The inverter's role in future power systems." Licentiate thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-421009.
Повний текст джерелаLi, Quan, and q. li@cqu edu au. "DEVELOPMENT OF HIGH FREQUENCY POWER CONVERSION TECHNOLOGIES FOR GRID INTERACTIVE PV SYSTEMS." Central Queensland University. School of Advanced Technologies & Processes, 2002. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20020807.152750.
Повний текст джерелаTongsopit, Sopitsuda. "The political economy of grid-connected distributed power generation systems in California /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2008. http://uclibs.org/PID/11984.
Повний текст джерелаBiswas, Shuchismita. "Power Grid Partitioning and Monitoring Methods for Improving Resilience." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/104684.
Повний текст джерелаDoctor of Philosophy
The modern power grid faces multiple threats, including extreme-weather events, solar storms, and potential cyber-physical attacks. Towards the larger goal of enhancing power systems resilience, this dissertation develops strategies to mitigate the impact of such extreme events. The proposed schemes broadly aim to- a) improve grid performance in the immediate aftermath of a disruptive event, and b) enhance grid monitoring to identify precursors of impending failures. To improve grid performance after a disruption, we propose a proactive islanding strategy for the bulk power grid, aimed at arresting the propagation of cascading failures. For the distribution network, a mixed-integer linear program is formulated for identifying optimal sub-networks with load and distributed generators that may be retrofitted to operate as self-adequate microgrids, if supply from the bulk power systems is lost. To address the question of enhanced monitoring, we develop model-agnostic, computationally efficient recovery algorithms for archived and streamed data from Phasor Measurement Units (PMU) with data drops and additive noise. PMUs are highly precise sensors that provide high-resolution insight into grid dynamics. We also illustrate an application where PMU data is used to identify the location of temporary line faults.
Raji, Atanda Kamoru. "Modelling and development of fuel cell off grid power converter system." Thesis, [S.l. : s.n.], 2008. http://dk.cput.ac.za/cgi/viewcontent.cgi?article=1039&context=td_cput.
Повний текст джерелаCintuglu, Mehmet Hazar. "Wide-Area Time-Synchronized Closed-Loop Control of Power Systems And Decentralized Active Distribution Networks." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/3031.
Повний текст джерелаTran, Thanh Kha. "Power Line Communication (PLC) for DC Microgrid systems." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSE1035.
Повний текст джерелаThe use of electrical wires to provide data transmission capabilities, known as Power Line Communication (PLC), has recently attracted considerable attention from the research community and industry, as well as from regulatory and standardization bodies. PLC networks boast several outstanding features that make them both a useful complement and a strong competitor for wireless networking solutions. The most obvious appeal of PLC networks is their low deployment cost when a wired electrical infrastructure is already in place. Besides, PLC networks allow communication through obstacles that commonly degrade wireless signals and deliver high data-rates simultaneously. PLC also provides a low-cost alternative that complements existing technologies with the aim of ubiquitous coverage. However, most PLC solutions are used on the AC grid. Until now, there are only a few studies on PLC for the DC grid, especially the DC microgrid. This thesis focuses on proposing an innovative and straightforward PLC solution for applications in DC energy distribution systems. This subject refers to a part of the C3μ project funded by the National Research Agency of France (ANR). This C3μ project investigates the possibility of using a DC smart microgrid architecture for distributing electricity in buildings instead of an AC one.This thesis has proposed a powerline communication solution for DC microgrid based on a new powerline physical modem on DC bus and CANopen (an open standard coming from the automotive industry). Moreover, a real DC microgrid testbed with PV, LED, and the battery has been implemented as a research tool for communication. The practical data transmission tests between PLC nodes have been carried out to evaluate the performance of our solution against the requirements set by the DC microgrid applications. The main results concerning the applicability of this concept and its limitations have also been presented
Jayam, Prabhakar Aditya. "Application of STATCOM for improved dynamic performance of wind farms in a power grid." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Jayam_Prabhakar_09007dcc804f7428.pdf.
Повний текст джерелаVita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed May 12, 2008) Includes bibliographical references (p. 64-66).
Gupta, Gunjan. "An analysis and improvement of selected features of power quality of grid-tied alternative energy systems." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2696.
Повний текст джерелаElectrical energy can be easily used and converted to other forms of energy for various applications. Technological advancement increases the dependency on electricity to a great extent. Various internal and external factors are responsible for the bad quality of power in power systems. The performance of the system is greatly affected by the presence of harmonics, as well as voltage and frequency variations, which leads to the malfunctioning of the device and decline of power quality and supply at load side. The reactive power compensation is carried out for better power quality. The literature survey is done to find the best and efficient scheme for reactive power compensation and mitigation of various power quality problems. The devices which are used to measure various power quality factors are discussed. Various mitigating schemes are surveyed in order to compensate reactive power and to improve the power quality at the distribution end. The integration of the most widely used renewable energy, wind energy in the distribution system creates technical issues like stability of the grid, harmonic distortion, voltage regulation, active and reactive power compensation etc. which are restricted to IEC and IEEE standards. One of the topics this thesis addresses is regulation in the reactive power generated along with voltage regulation by using an effective power electronics device known as a STATCOM. The main power quality factors like overvoltage and voltage flickers are mitigated by establishing STATCOMs in small wind farms. The wind farms are equipped with three wind turbines. These three wind turbines found in the wind farm can be operated together or one after another with an introduced delay. A glitch in even a little piece of a power grid can result in loss of efficiency, income and at times even life. In this manner, it is basic to outline a system which can distinguish the faults of the power system and take a faster response to recover it back to required reactive power. Two devices STATCOM and D-STATCOM are used for this purpose in this thesis. The D-STATCOM circuit and operating principle are also discussed in thesis. Different topologies of D-STATCOM discussed with their benefits and shortcomings. The voltage, current and hybrid technologies of D-STATCOM are also discussed.
Fulhu, Miraz Mohamed. "Active human intelligence for smart grid (AHISG) : feedback control of remote power systems." Thesis, University of Canterbury. Mechanical Engineering, 2014. http://hdl.handle.net/10092/9582.
Повний текст джерелаOmole, Adedamola. "Voltage Stability Impact of Grid-Tied Photovoltaic Systems Utilizing Dynamic Reactive Power Control." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3615.
Повний текст джерелаChen, Fang. "Control of DC Power Distribution Systems and Low-Voltage Grid-Interface Converter Design." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/77532.
Повний текст джерелаPh. D.
Madangombe, Taruziwa. "Integration of wind energy systems into the grid: power quality and technical requirements." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/6661.
Повний текст джерелаMcAndrew, Thomas Charles. "Weighted Networks: Applications from Power grid construction to crowd control." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/668.
Повний текст джерелаRetnanestri, Maria Immaculata Taufi Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "The I3A Framework: enhancing the sustainability of off-grid photovoltaic energy service delivery in Indonesia." Awarded by:University of New South Wales. School of Electrical Engineering and Telecommunications, 2007. http://handle.unsw.edu.au/1959.4/31442.
Повний текст джерелаAsbery, Christopher W. "SMART GRID COMMUNICATIONS." UKnowledge, 2012. http://uknowledge.uky.edu/ece_etds/10.
Повний текст джерелаGeury, Thomas. "Smart matrix converter-based grid-connected photovoltaic system for mitigating current and voltage-related power quality issues on the low-voltage grid." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/243967.
Повний текст джерелаDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Howard, Dustin F. "Modeling, simulation, and analysis of grid connected dish-stirling solar power plants." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34832.
Повний текст джерелаBai, Wenshuai. "DC Microgrid optimized energy management and real-time control of power systems for grid-connected and off-grid operating modes." Thesis, Compiègne, 2021. http://www.theses.fr/2021COMP2586.
Повний текст джерелаThis thesis focus on the research of the DC microgrid following two operation models: grid-connected mode, and off-grid mode including the islanded and isolated modes. The aim of this thesis is to propose a DC microgrid combining the advantages of the grid-connected or the off-grid mode, which named full DC microgrid. ln the full DC microgrid, the renewable energy sources, storage, and public grid are included, and the back-up sources also applied to reduce the load shedding. ln the full DC microgrid, a supervisory system is proposed to manage the power. The real-time power management in the operational layer of the supervisory system can keep the power balance. ln the optimization layer of the supervisory system, the day-ahead optimization is proposed to achieve the global minimal operation cost. The simulation results show that the full DC microgrid combines both advantages of the grid-connected and the off-grid mode to minimize the operating cost. Then, the supervisory system considers the dynamic efficiency of the converter to solve the problem that the power quality of the microgrid is degraded due to the unstable DC bus voltage caused by the inaccurate power control. The simulation results show that considering the dynamic efficiency of the converter in the operational layer of the supervisory system, the fluctuation of the DC bus voltage can be reduced. Regarding the importance of the PV prediction for the day-ahead optimization, two prediction modes are studied and compared to give a robust PV prediction power. The results are that the two models almost have the same results
Whitcomb, Jacob A. "The value of power grid flexibility : applied optimization methods for bulk electricity storage and technology RD&D." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/105303.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 104-110).
As power systems adapt to include aging infrastructure, new socio-political priorities, and renewable electricity resources, grid operators look to a more flexible grid. Electricity storage flexibility is one strategy gaining interest. Clean energy advocates see benefits in terms of greater renewables integration and lower emissions; grid operators see storage as an improved security system in the face of supply and demand variability and uncertainty. However, as power systems are designed for reliable and efficient operations using available technologies, newer, better-performing technologies such as energy storage devices may not always win the market. Several market barriers to storage remain, including high storage capital costs and a lack of trusted tools for modeling and estimating the lifetime value of new capacity investments [1]. Most storage modeling strategies omit constraints that describe the technical operating boundaries of different power generating technologies, which can lead an overestimation of total operating costs for the power system [2]. I describe a mixed integer linear optimization framework for estimating the optimal control and value of energy storage in a virtual power generation system with economic, regulatory, and technical performance characteristics. The model consists of power plant commitment, dispatch, and selective capacity expansion constraints that simulate optimal investments and operations of the power generation system. A new formulation for modeling energy storage is also developed in order to improve the accuracy of round-trip efficiencies and allow for the inclusion of minimum storage output constraints. Using this model, I solve for break-even target prices for storage capital costs under a range of scenarios (storage futures scenarios). A second challenge slowing the adoption of storage is a lack of spending on performance improvements and cost-reductions. A two-factor learning curve and optimization approach is developed to solve for the optimal portfolio of research, development, demonstration, and diffusion investments (RDD&D) over multiple investment periods. Using the target capital costs from unit commitment model output as the investment model input value, innovating firms and policy planners may better identify cost targets and investment strategies for reaching target levels of storage deployment. Electricity storage becomes more valuable as net load variability increases. The impact of net load variability is tested by changing the level of renewable generation resources in the system. The current capital cost of storage-here, compressed air energy storage (CAES)-generally exceeds the target cost needed to make CAES economical when it is used to provide load following, load shifting, and operating reserve services in high-voltage power generation systems. Scenario analysis shows that when renewables generation reaches 35%, CAES becomes economical in limited quantities due to the added value from providing renewables integration and greater operating reserves. Using this framework, I identify different levels of cost reductions needed to drive improved adoption and make several RDD&D recommendations.
by Jacob Whitcomb.
S.M. in Engineering and Management
Mata, Yandiola Cristina. "Feasibility Analysis of the Use of Hybrid Solar PV-Wind Power Systems for Grid Integrated Mini-grids in India." Thesis, KTH, Kraft- och värmeteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-218023.
Повний текст джерелаMohamed, Ahmed A. S. Mr. "Bidirectional Electric Vehicles Service Integration in Smart Power Grid with Renewable Energy Resources." FIU Digital Commons, 2017. https://digitalcommons.fiu.edu/etd/3529.
Повний текст джерела