Дисертації з теми "Photovoltatic generators"
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Golder, Andrew S. Miu Karen Nan. "Photovoltaic generator modeling for large scale distribution system studies /." Philadelphia, Pa. : Drexel University, 2006. http://hdl.handle.net/1860/1220.
Повний текст джерелаThipthorp, Jeremy. "Integrating photovoltaic systems into remote diesel generator powered networks." Thesis, Thipthorp, Jeremy (2016) Integrating photovoltaic systems into remote diesel generator powered networks. Honours thesis, Murdoch University, 2016. https://researchrepository.murdoch.edu.au/id/eprint/33962/.
Повний текст джерелаElsaidi, Abdulsalam. "Photovoltaic (PV) type solar generators and their effect on distribution systems." Thesis, University of Missouri - Kansas City, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1544928.
Повний текст джерелаDistribution systems are designed to operate in radial mode (the simplest system topology) without any generation on the system, unidirectional power flow from the distribution substation to the customers via main feeder(s) and its(their) laterals within a specified range of operating points. The rapid growth of PV module installations on the distribution systems could not only offset the load but also cause a significant impact on the flow of power (active and reactive), voltage level, and fault currents, therefore; concerns about their potential impacts on the stability and operation of the power system have become one of the important issues and may create barriers to their future expansion. The most likely potential impact of the high PV penetration level is losing the voltage regulation, because it is directly related to the amount of reverse power flow. The main goal of this thesis is to approximate the maximum level of PV penetration which the system can accommodate without any impact on the voltage profile, stability, and operation.
Berasategi, Arostegi Aloña. "New optimized electrical architectures of photovoltaic generators with high conversion efficiency." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2079/.
Повний текст джерелаThis thesis focuses in the optimization of the efficiency of photovoltaic power conversion chain. In this way, different improvements have been proposed in the electrical architecture and its control algorithms in order to obtain high efficiency in a large rage of input power and long life-time of PV power conversion system. Using loss analysis, the benefits and drawbacks of parallel connection of power structures has been shown. This analysis has allowed the conception of a new optimized architecture constituted by parallelized power converters, called Multi-Phase Adaptive Converter (MPAC). The singularity of these power structures consists on the adaptation of the phases of the converter depending on the power production in real-time and looking for the most efficient configuration all time. In this way, the MPAC guarantees high conversion efficiency for all power ranges. Another control law is also implemented which guarantees a rotation of the phases to keep their working time uniform. Thus, the stress of the components of all the phases is kept homogenous, assuring a homogeneous aging of the phases. Since the global stress of the component is lower, the MPAC presents a longer life-time. The improvements in the power conversion stage are shown by experimental prototypes. Experimental tests have been done for global validation. Comparison with a classical power conversion stage shows the improvement in the global conversion efficiency
Al-Sabounchi, Ammar M. Munir. "Optimal sizing and location of photovoltaic generators on three phase radial distribution feeder." Thesis, De Montfort University, 2011. http://hdl.handle.net/2086/5225.
Повний текст джерелаMesbahi, Abdessamad. "Deterministic and Stochastic Economic Modeling of Hybrid Power Supply System with Photovoltaic Generators." Master's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/42555.
Повний текст джерелаAlotaibi, Lafi. "Commande et optimisation d'une installation multi-sources." Thesis, Reims, 2012. http://www.theses.fr/2012REIMS039.
Повний текст джерелаThis thesis addresses the control and optimization of a stand-alone photovoltaicsystem. Thus, we proposed a fuzzy logic algorithm for tracking the maximum powerpoint to overcome the disadvantages of classical methods. Then we focused onoptimizing the structure of the installation. Indeed, in conventional systems, in thecase of failure of a panel, the whole serie block becomes unusable, greatly reducingthe production capacity. To resolve this problem, we proposed a supervisor for theautomatic reconfiguration of the installation so that only the failed panels is takenoffline. Furthermore, to manage the power flow and to meet user demand, wedeveloped a fuzzy supervisor. Thus, the surplus production is systematically storedin the battery for later use in cases where demand exceeds production. In addition,the proposed structure can not draining the battery in case of need thereby greatlyextend its lifetime
Gudivada, Venkata Thulasi Prasad. "Impact of photovoltaic generators and electric vehicles on a weak low voltage distribution grid." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43810.
Повний текст джерелаManhal, Ali, and Ali Tammam M. "Solar Tent : A Photovoltaic Generator Model for a Flexible Fabric with Inbuilt Cells." Thesis, Högskolan Dalarna, Energiteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:du-30552.
Повний текст джерелаSahan, Benjamin [Verfasser]. "Wechselrichtersysteme mit Stromzwischenkreis zur Netzanbindung von Photovoltaik-Generatoren / Benjamin Sahan." Kassel : Kassel University Press, 2010. http://d-nb.info/1016850891/34.
Повний текст джерелаAhmed, Eshita. "Hybrid Renewable Energy System Using Doubly-Fed Induction Generator and Multilevel Inverter." Thesis, North Dakota State University, 2012. https://hdl.handle.net/10365/26501.
Повний текст джерелаDavenport, Bradley P. "Advanced thermophotovoltaic cells modeling, optimized for use in radioisotope thermoelectric generators (RTGS) for Mars and deep space missions." Thesis, Monterey California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1170.
Повний текст джерелаThermophotovoltaic cells are a good candidate for use in high efficiency radioisotope thermoelectric generator (RTG) power devices for deep space missions. This thesis examines the use of Silvaco Virtual Wafer Fabrication Software as a tool for designing and optimizing TPV cells for different possible spectra. It gives results for GaSb and InGaAs cells optimized to the AM0 spectrum which closely match published data as well as hypothetical cells optimized to the spectrum of a 1300K blackbody.
Ensign, United States Navy
CIOCIA, ALESSANDRO. "Optimal Power Sharing between Photovoltaic Generators, Wind Turbines, Storage and Grid to Feed Tertiary Sector Users." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2670815.
Повний текст джерелаPerera, Sam Prasanna Kurukulasuriya, and Sumith Ruwan Dharmasiri Kachchakaduge. "SMART VAR Generator to Manage Grid Voltage Stability issue of Low Frequency Switching Photovoltaic Inverters." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-20595.
Повний текст джерелаRogers, Stephen Daniel. "Permitting and interconnection of solar PV generators for the Marin Energy Authority Feed-in Tariff Program." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/756.
Повний текст джерелаKapambwe, Elias. "Economic Feasibility Photovoltaic/Diesel/Battery Hybrid Power Syatems to replace stand-alone diesel generators in off-grid remote areas of Zambia." Thesis, KTH, Kraft- och värmeteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-95517.
Повний текст джерелаBouzguenda, Mounir. "A methodology to assess the interactions of renewable energy systems dynamics with fluctuating loads." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06062008-171542/.
Повний текст джерелаAsef, Pedram. "Multi-level-objective design optimization of permanent magnet synchronous wind generator and solar photovoltaic system for an urban environment application." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/665396.
Повний текст джерелаEsta tesis muestra un novedoso estudio referente al diseño optimizado de forma analítica y numérica de un generador síncrono de imanes permanentes (PMSGs) para una aplicación de microgeneración eólica en un entorno urbano, donde se ha escogido una topología de rotor exterior con un estator de ranuras cerradas. Las ventajas electromagnéticas de los arrollamientos fraccionarios de doble capa, con bobinas concentradas se discuten ampliamente en la parte inicial del diseño del mismo, así como las características de distribución de la inducción, los armónicos espaciales y temporales, la fem generada, el par de cogging así como las características de salida (par, potencia generada, la eficiencia y la distribución y cálculo de las pérdidas en el hierro que son analizadas detalladamente) Posteriormente se evalúan diferentes configuraciones de estructuras de imanes con magnetización Halbach con el fin de maximizar las prestaciones del generador. Adicionalmente se analiza la distribución de temperaturas y su mejora mediante el uso de un novedoso diseño mediante el uso de ventilación natural para velocidades próximas a la nominal y superiores con el fin de disminuir la temperatura de la máquina, principalmente en el diente estatórico. El cálculo analítico se completa mediante simulaciones 2D y 3D utilizando el método de los elementos finitos así como mediante diversas experiencias que validan los modelos y aproximaciones realizadas. Posteriormente se desarrollan algoritmos de optimización aplicados a variables tales como el tipo de magnetización, la potencia de salida, la eficiencia así como la minimización de las pérdidas y el coste de los materiales empleados. En la tesis se proponen un nuevo diseño optimizado basado en una metodología multinivel usando la metodología de superficie de respuesta (D-RSM) y un algoritmo de Booth (maximizando la potencia de salida y minimizando el coste de material empleado) Adicionalmente se investiga la maximización de la eficiencia del generador trabajando conjuntamente con el circuito de salida acoplado. El algoritmo utilizado queda validado mediante la experimentación desarrollada conjuntamente con el mismo. Adicionalmente, se han realizado diversos estudios vibroacústicos trabajando a velocidad variable usando dos técnicas diferentes para reducir el ruido generado y las vibraciones producidas. Posteriormente se considera un sistema fotovoltaico orientado a aplicaciones urbanas que hemos llamado “Smart tree for small power generation” y que consiste en un poste con un generador eólico en la parte superior juntamente con uno o más paneles fotovoltaicos. Este sistema se ha modelado usando metodologías en 3D. Se ha considerado el efecto de las sombras proyectadas por los diversos elementos usando datos meteorológicos y de irradiación solar de la propia ciudad de Barcelona. Usando una metodología basada en un análisis 3D y Pareto se consigue identificar completamente el sistema fotovoltaico; para este sistema se considera la temperatura de la célula fotovoltaica y la carga conectada con el fin de generar un algoritmo de control que permita obtener el punto de trabajo de máxima potencia (MPPT) comprobándose posteriormente el funcionamiento del algoritmo para diversas situaciones de funcionamiento del sistema
La tesis desenvolupa un nou estudi per al disseny optimitzat, analític i numèric, d’un generador síncron d’imants permanents (PMSGs) per a una aplicació de microgeneració eòlica en aplicacions urbanes, on s’ha escollit una configuració amb rotor exterior i estator amb ranures tancades. Es discuteixen de forma extensa els avantatges electromagnètics dels bobinats fraccionaris de doble capa així com les característiques resultats vers la distribució de les induccions, els harmònics espacials i temporals, la fem generada, el parell de cogging i les característiques de sortida (parell, potencia, eficiència i pèrdues) Tanmateix s’afegeix l’estudi de diferents estructures Halbach per als imants permanents a fi i efecte de maximitzar les característiques del generador. Tot seguit s’analitza la distribució de temperatures i la seva reducció mitjançant la utilització d’una nova metodologia basada en la ventilació natural. Els càlculs analítics es complementen mitjançant anàlisi en 2 i 3 dimensions utilitzant elements finits i diverses experiències que validen els models i aproximacions emprades. Una vegada fixada la geometria inicial es desenvolupen algoritmes d’optimització per a diverses variables (tipus de magnetització dels imants, potencia de sortida, eficiència, minimització de pèrdues i cost dels materials) La tesi planteja una optimització multinivell emprant la metodologia de superfície de resposta i un algoritme de Booth; a més, es realitza la optimització considerant el circuit de sortida. L’algoritme resta validat per la experimentació realitzada. Finalment, s’han considerat diversos estudis vibroacústic treballant a velocitat variable, emprant dues tècniques diferents per a reduir el soroll i les vibracions desenvolupades. Per a finalitzar l’estudi es considera un sistema format per una turbina eòlica instal·lada sobre un pal de llum autònom, els panells fotovoltaics corresponents i el sistema de càrrega. Per a modelitzar l’efecte de l’ombrejat s’ha emprat un model en 3D i les dades del temps i d’irradiació solar de la ciutat de Barcelona. El model s’ha identificat completament i s’ha generat un algoritme de control que considera, a més, l’efecte de la temperatura de la cèl·lula fotovoltaica y la càrrega connectada al sistema per tal d’aconseguir el seguiment del punt de màxima potencia
Abed, James. "Design consideration, comparative evaluation and cost analysis of a Photovoltaic (PV) system and a generator for off-grid use in California." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1603751.
Повний текст джерелаTechnology improvement on solar systems has recently given the solar industry a big boost in the market especially in locations such as California where solar irradiance is abundant and fossil fuel prices are constantly on the rise. However solar power technology is not perfect and may still have some drawbacks. This project presents a theoretical evaluation and comparison between two possible off-grid systems in accordance with their cost over a fixed amount of years. A case study will be conducted to determine which of the following two off-grid systems best satisfies a given load profile in terms of cost and efficiency: a Photovoltaic (PV) system with battery back-up or an AC generator with diesel fuel engine. A cost comparison of both systems will determine whether solar energy is a good investment and can be considered as an alternative power solution for the future. A MATLAB simulation of the PV system will help visualize the battery’s charging process with respect to the load.
Dalsass, Manuel [Verfasser], Christoph J. [Akademischer Betreuer] Brabec, and Christoph J. [Gutachter] Brabec. "Quality Assessment of Large-scale Photovoltaic Generators Based on Inverter Data and Thermographic Inspections / Manuel Dalsass ; Gutachter: Christoph J. Brabec ; Betreuer: Christoph J. Brabec." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2019. http://d-nb.info/1177368676/34.
Повний текст джерелаMartins, Criciéle Castro. "Avaliação da dinâmica de nuvens e do impacto em redes de distribuição com grande participação de geração fotovoltaica." Universidade Federal de Santa Maria, 2017. http://repositorio.ufsm.br/handle/1/12935.
Повний текст джерелаThe search for a more diverse energy matrix, to decrease the fossil fuel consumption com-bined with the enhance concern of environmental impacts results in an increasing interest on the installation of distributed generators. Nevertheless, its technical impacts must be studied carefully to benefit electric energy distribution systems. Considering photovoltaic generators, the presence of clouds influences directly in the solar irradiance on Earth’s surface, what var-ies, in a significant way, the generation of energy throughout time. The continuous clouds movement above electrical grids that contain this kind of generation produces difficulty in the forecast variations of the generated power flow and voltage fluctuations on electrical grid im-pacting the consumer’s energy quality. Thus, this master dissertation proposes to rank real solar irradiance data according to satellite image processing, which counts on information referring to the different sort of clouds. The purpose is to investigate how the dynamic of clouds affects the energy production from photovoltaic generator and, consequently, the im-pact on the electrical grids that counts with it. At first, different types of clouds are ranked through image processing techniques, so that images were obtained in CPTEC. Weather Fore-casting and Climate Studies Center website using satellite GOES-13 data with 30 minutes periods. In comparison to image processing results, it is used measured data from a photovol-taic system installed on the roof of Block E from Santa Maria’s Polytechnic School to rate the shading influence, thus, the classification of measured data on: sunny, partially clouded and fully clouded days. Therefore, for the evaluation of impact of a photovoltaic systems on dif-ferent generation situations over an electric distribution grid, it was used the IEEE 34-bus feeder, through known analysis such as QuasiStatic Time-Series Analysis performed by the software Open Distribution System Simulator (OpenDSS). Different load profiles are also considered, such as constant and variating loads on weekdays and weekends. The results in each tested case are presented and is performed an analysis of information from the energetic point of view, observing the real and local generation capacity, and the quality of the energy provided by the system, in which is referred the voltage levels and operation of voltage regu-lators equipment.
A busca pela diversificação da matriz energética, diminuição na utilização de combustíveis fósseis para geração de energia elétrica, além da maior preocupação com os impactos ambientais, fazem com que se aposte cada vez mais na instalação de geradores distribuídos. Contudo, para que estes possam vir a beneficiar sistemas de distribuição de energia elétrica, seus impactos técnicos devem ser cuidadosamente estudados. Considerando geradores fotovoltaicos, a presença de nuvens influ-encia diretamente a irradiância solar que chega à superfície terrestre, variando de uma forma sig-nificativa ao longo do tempo a energia gerada. O movimento contínuo das nuvens sobre redes elétricas que contam com esse tipo de geração produz variações de difícil previsibilidade sobre o fluxo de potência gerado e flutuações de tensão na rede elétrica, acarretando em possíveis impac-tos na qualidade de energia fornecida aos consumidores. Assim, esta dissertação de mestrado pro-põe classificar dados reais de irradiância solar conforme o processamento de imagens de satélite que contam com informações referente a classificação de diferentes tipos de nuvens, com objetivo de investigar como a dinâmica de nuvens afeta a produção de energia através de geradores fo-tovoltaicos, e consequentemente redes de distribuição de energia elétrica que contam com a parti-cipação dos mesmos. Em um primeiro instante, através de técnicas de processamento de ima-gem dá-se a classificação dos diferentes tipos de nuvens, de modo que as imagens são obtidas através do site do CPTEC (Centro de Previsão do Tempo e Estudos Climáticos) com dados do satélite GOES-13 em períodos de 30 minutos. Em comparação aos resultados de processamento de imagem são utilizados dados medidos de um sistema fotovoltaico, instalado no telhado do Blo-co E do Colégio Politécnico de Santa Maria, para avaliar a influência do sombreamento, e assim classificação dos dados medidos em: dia ensolarado, parcialmente encoberto e encoberto. Logo, para a avaliação do impacto em uma rede de distribuição elétrica que conta com sistemas fotovol-taicos em diferentes situações de geração, considera-se o sistema IEEE 34 barras, a partir de aná-lises conhecidas como Quasi-Static Time-Series Analysis, realizadas pelo software Open Distri-bution System Simulator (OpenDSS). Também, são considerados diferentes perfis de carga, como por exemplo, cargas que não variam no tempo, e cargas que variam com características de dia de semana e fim de semana. Os resultados de cada caso testado são apresentados e é realizado uma análise de informações tanto do ponto de vista energético, observando-se a capacidade real e local de geração, além da qualidade de energia fornecida pelo sistema, no que se refere aos níveis de tensão e operação de equipamentos reguladores de tensão.
Almada, Janaina Barbosa. "Modeling, Control and Management of Microgrids Operation with Renewable Sources." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11122.
Повний текст джерелаNowadays, the distribution networks of electricity are the segment of the electrical power systems that has experienced more changes, due in particular to the presence of distributed generation and the technological advances in the areas of instrumentation, automation, measurement, information technology and comunication. This work aims to present the modelling, the control and the operation management of a group of small-scale energy resources connected to the low voltage, which coordinated form a microgrid. The microgrid energy resources are solar photovoltaic sources, wind energy based on double fed induction generator and hydrogen fuel cell, and a storage system with batteries. Two conceptions are developed: a single-phase microgrid and a three-phase microgrid, both operating in connected mode and isolated from the utility. Each energy resource is connected to a point of common coupling through power converters. For each converter was designed a set of control loops. The master-slave strategy was used to control the converters and to microgrid management. In master-slave configuration only the master converter is designed to be the voltage reference and others operate as a current source. For managing the steady state operation of microgrids different operating scenarios were considered, with variation of load and generation levels, as well as changes in tariff flags, for load supply with economy and sources operating at maximum efficiency. The proposed systems operate satisfactorily fulfill the requirements of utility for synchronization and disconnection. The injected currents are below the allowed distortion level. In stand-alone mode, the system voltage remains within the appropriate level of amplitude and frequency.
Atualmente, as redes de distribuiÃÃo de energia elÃtrica sÃo o segmento dos siste-mas elÃtricos de potÃncia que mais tem experimentado mudanÃas, devido, em es-pecial, à presenÃa da geraÃÃo distribuÃda e aos avanÃos tecnolÃgicos nas Ãreas de instrumentaÃÃo, automaÃÃo, mediÃÃo, tecnologia da informaÃÃo e comunicaÃÃo. Este trabalho tem por objetivo apresentar a modelagem, o controle e o gerenciamento da operaÃÃo de um conjunto de recursos energÃticos de pequeno porte, conectados à baixa tensÃo, que coordenados formam uma microrrede. Os recursos energÃticos da microrrede sÃo fontes solar fotovoltaica, eolielÃtrica com gerador de induÃÃo de dupla alimentaÃÃo e cÃlula combustÃvel a hidrogÃnio, e um sistema de armazenamento de energia a baterias. Duas concepÃÃes de microrredes sÃo desenvolvidas: microrrede monofÃsica e microrrede trifÃsica, ambas operando em modo conectado e isolado da rede elÃtrica principal. Cada recurso energÃtico à conectado a um ponto comum de conexÃo atravÃs de conversores de potÃncia. Para cada conversor foi projetado um conjunto de malhas de controle. A estratÃgia mestre-escravo foi usada para o controle dos conversores e gerenciamento da microrrede. Na configuraÃÃo mestre-escravo apenas o conversor mestre à designado para ser a referÃncia de tensÃo que os outros conversores necessitam para operarem como fonte de corrente. Para o gerenciamento da operaÃÃo das microrredes em regime permanente, foram considerados diferentes cenÃrios de operaÃÃo, com variaÃÃo de nÃveis de carga e de geraÃÃo, bem como variaÃÃo de bandeiras e postos tarifÃrios, visando atender a carga com economicidade e fontes operando em mÃxima eficiÃncia. Os sistemas propostos operam de forma satisfatÃria obedecendo aos requisitos da concessionÃria para a sincronizaÃÃo e desconexÃo. As harmÃnicas de corrente injetada estÃo abaixo do nÃvel de distorÃÃo permitido. No modo isolado, a tensÃo dos sistemas permanece dentro do nÃvel adequado de amplitude e frequÃncia.
Cavazzana, Francesco. "Impedance-Based Stability Analysis in Smart Grids with Large Penetration of Renewable Energy." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3422785.
Повний текст джерелаL'ampia diffusione delle risorse di energia distribuite ha portato ad uno scenario dove la penetrazione di fonti rinnovabili è molto elevata e può significativamente influenzare la rete. La crescente complessità di questi sistemi richiede un adeguato studio della stabilità: l'approccio basato sulle impedenze ha come uno dei maggiori vantaggi la possibilità di caratterizzare i componenti separatamente, ad esempio sorgente e carico, e di stimare la stabilità ad una determinata interfaccia applicando il criterio di Nyquist al rapporto di impedenze. Questo metodo è stato largamente utilizzato nei sistemi DC, per analizzare le interazioni tra convertitori e prevedere la stabilità del sistema finale anche in caso di più convertitori parallelo, spesso utilizzando criteri per limitare le interazioni e garantire una configurazione stabile. Successivamente il metodo è stato esteso a sistemi trifase, dove la configurazione con ingressi ed uscite multiple richiede l'utilizzo del criterio generalizzato di Nyquist per analizzare la stabilità. Il primo caso presentato in questo lavoro è un grande impianto fotovoltaico connesso alla rete, dove il controllo degli inverter è fornito nel sistema di riferimento abc e, considerando un sistema bilanciato e simmetrico, l'inverter equivalente monofase è stato utilizzato in questa analisi. La stabilità è determinata seguendo il metodo basato sulle impedenze precedentemente citato, includendo anche il contributo del generatore equivalente. L'effetto di moltiplicazione di impedenza è qui formalizzato anche nel caso di inverter paralleli non uguali. L'influenza dell'impedenza di linea e della taglia dell'inverter sono considerate. Il risultato dello studio è un approccio che include un'accurata analisi di stabilità, come negli approcci basati su sistemi multi-input e multi-output, e la modularità, come negli approcci basati sulle impedenze. Inoltre, la sensibilità rispetto alla rete è stata studiata per il caso di inverter paralleli multipli, con lo scopo di analizzare come questa si modifica con un crescente numero di connessioni. Recentemente, l'interesse sulle reti ibride con generatori diesel e sistemi di accumulo di energia tramite batterie stanno ricevendo maggiore attenzione perché una ogni cinque persone vive senza accesso all'elettricità. Questa soluzione non connessa alla rete principale è quindi in grado di fornire una generazione continua ed integrare le energie rinnovabili nel sistema. La seconda parte si concentra nella modellizzazione di una rete ibrida trifase, dove il generatore diesel è controllato con controllo isocrono e gli inverter, utilizzati come interfaccia per le batterie, sono gestiti con un controllo droop con dei loop esterni addizionali per fornire l'inseguimento dei riferimenti di potenza quando connessi al generatore. Sono riportati nella tesi i risultati sperimentali del sistema con un generatore diesel a 400kVA e fino a 300kVA dalle batterie. L'analisi ha portato ad una completa riproduzione dell'interazione tra il generatore diesel e un crescente numero di inverter connessi, nel qual caso l'inerzia totale del sistema cambia. Tuttavia, in letteratura non è presente alcuna analisi di stabilità abbastanza accurata per analizzare un sistema di una tale complessità e per predire eventuali instabilità. La modularità dell'analisi di stabilità basata sulle impedenze può quindi fornire una suddivisione di questa complessità, e quindi è un approccio opportuno. In questo lavoro, l'impedenza di uscita di un inverter controllato in droop è determinata, con lo scopo di caratterizzare questo elemento largamente utilizzato in applicazioni non connesse alla rete. Dopo aver determinato il punto operativo, il modello analitico dell'impedenza di uscita è derivato riferendosi sia al controllore interno al convertitore che al sistema, includendo l'effetto dell'impedenza di disaccoppiamento e delle dinamiche interne dell'inverter. Infine, questo lavoro presenta uno strumento matematico per convertire le impedenze da un sistema di riferimento dq ad un altro. È fornito un esempio di applicazione di questo strumento di conversione nel caso dell'inverter controllato in droop, con lo scopo di provare la correttezza della trasformazione.
Obadal, Petr. "Různé způsoby využití slunečního záření pro výrobu elektrické energie." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219072.
Повний текст джерелаYin, Changjie. "Impact of diesel generator operating modes on standalone DC microgrid and control strategies implying supercapacitor." Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2411/document.
Повний текст джерелаThe intermittent and random nature of renewable sources, such as photovoltaic and wind turbine, asks for the complement of storage, such as battery and back-up energy, such as diesel generator, especially in a standalone power system. Concerning the diesel generator, it needs some time to start up and cannot immediately offer the needed power, due to its dynamic behavior. Hence, the power quality is lowered down during this period because of the shortage of power. Therefore, during the period of the diesel generator starting up, a supercapacitor is suggested to compensate the power balance because of its fast response and high power density. A power control strategy is proposed to achieve the coordination between diesel generator and supercapacitor. Both simulation and experimental results show that the proposed control strategy is able to regulate the DC bus voltage within the acceptable limits and supplying the load during the renewable power under generation or load step-increase situations. In addition, the supercapacitor can be also used to overcome the electrochemical storage limits like its state of charge and maximum current. So, this thesis proposes the real time power control for a hybrid photovoltaic-battery-supercapacitor-diesel generator DC microgrid system, aiming to meet the load power demand with reliability and stabilizing the DC bus voltage. Both simulation and experimental results show that the designed control strategy improves the DC microgrid dynamic and static performances under different operating conditions. Furthermore, in order to minimize the diesel generator energy cost, the fuel cost and fuel consumption are analysed through several experimental tests. Therefore, the optimal value of its power generation is deduced and applied in a newly proposed energy management strategy. This strategy can achieve the goal of maximizing the utilization of photovoltaic energy and taking into account the slow start-up characteristic and energy cost of diesel generator. Both simulation and experimental studies are carried out by using the real photovoltaic data to illustrate the performance and the behavior of the hybrid system. The obtained results verify the effectiveness of this strategy. Furthermore, the comparison with the previous energy management strategy, in which the diesel generator energy cost is not considered, demonstrates that the newly proposed energy management strategy can reduce the total cost of the hybrid DC power system
Abouda, Salim. "Contribution à la commande des systèmes photovoltaiques : application aux systèmes de pompages." Thesis, Reims, 2015. http://www.theses.fr/2015REIMS005/document.
Повний текст джерелаThe aim of the work presented in this thesis is to contribute to the study of a photovoltaic system operating at its maximum power and energetically autonomous. The case studied in this thesis relates to the control of a chain of photovoltaic pumping in an isolated site. In this sense and for the PV system operates at its maximum power, it must include a converter associated with a MPPT algorithm. In our study, we used two MPPT algorithms, the algorithm “Perturb and Observe” (P & O), then the algorithm “Increment of Conductance” (IncCond). In some industrial applications, it is sometimes necessary to maintain the voltage delivered by the PV system constant. For this, a control system of this voltage is presented. The methods used for the simulation of this system are based on the use of a PID controller and the sliding mode control, and finally a fuzzy logic controller. This system was tested for a resistive load then for the case of a centrifugal pump driven by a permanent magnetic DC motor. Then we studied the case of a pumping chain using a three-phase induction motor as a drive motor. In order to be able to regulate the flow of water, the Direct Torque Control method “DTC” is used to control the speed of the induction motor because it is proportional with the water flow
Arnošt, Karel. "Generátorové snímače." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217705.
Повний текст джерелаLopez, Santos Oswaldo. "Contribution to the DC-AC conversion in photovoltaic systems : Module oriented converters." Thesis, Toulouse, INSA, 2015. http://www.theses.fr/2015ISAT0001/document.
Повний текст джерелаThese last years, a growing interest in power electronic systems has been motivated by the emergence of distributed renewable energy resources and their interconnection with the grid. In this context, the need of low power topologies fed by a few photovoltaic modules avoiding the use of transformers opens the study of special converters and the associated control strategies ensuring stability, reliability and high efficiency. A resulted generic device known in the commercial and scientific literature as “microinverter” or “module integrated converter” performs a plug and play product together with the PV module called an “AC module”.This work is devoted to the study of a transformer-less single-phase double-stage grid-connected microinverter. The proposed topology has a non-isolated high-gain boost type DC-DC converter and a non-isolated buck type DC-AC converter connected in cascade through a DC bus. The DC-DC converter permanently extracts the maximum power of the PV module ensuring at the same time a good performance coping with power changes introduced by the change in the environmental conditions. The DC-AC stage injects the power extracted by the DC-DC stage into the grid ensuring a high level of power quality. The research efforts focus on the involved control functions based on the sliding mode control theory, which leads to a simple implementation with a comprehensive theoretical description validated through simulation and experimental results.After giving the state-of-the-art in the first chapter, the manuscript is divided into four chapters, which are dedicated to the Maximum Power Point Tracking (MPPT), the DC-DC stage and its control, the DC-AC stage and its control and the complete microinverter. A new Extremum Seeking Control (ESC) MPPT algorithm is proposed. The single-switch quadratic boost converter is studied operating as a Loss-Free-Resistor (LFR) obtaining a high DC output voltage level with a safe operation. The full-bridge converter is controlled as a Power Source Inverter (PSI) using a simple sliding-mode based tracking law, regulating the voltage of the DC bus and then ensuring a high power quality level in the grid connection. Finally, the three building blocks are merged to obtain a sliding mode controlled microinverter constituting the main result and contribution of the work
Koval, Filip. "Efektivnost provozu fotovoltaických generátorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217629.
Повний текст джерелаBun, Long. "Détection et localisation de défauts pour un système PV." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00647189.
Повний текст джерелаZnbill, Laila. "Nízoenergetické měniče v pevné fázi pro Energy harvesting." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-449086.
Повний текст джерелаNegreiros, Terrones John William. "Despacho de reativos para regulação de tensão em redes de média tensão com geradores fotovoltaicos." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152549.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Neste trabalho, propõe-se uma metodologia baseada nas incertezas da radiação solar para prever o despacho de demanda e reativos nos sistemas de distribuição radial com geradores fotovoltaicos (GFs). O objetivo dessa metodologia é melhorar o perfil da magnitude de tensão para o dia seguinte, sujeito a certas restrições operativas do sistema elétrico de distribuição. No desenvolvimento dos algoritmos de solução são considerados geradores distribuídos que têm forte dependência das variações da fonte primária de energia (principalmente sistemas fotovoltaicos), ou seja, os limites de injeção de potência dos GFs dependem das incertezas da radiação solar. Este grupo de geradores precisa de considerações que incluam as incertezas na geração de energia. Para isso, elaboram-se cenários de radiação baseado na função de distribuição de probabilidade beta. Assim, são realizados fluxos de potência probabilísticos em múltiplos cenários. Leva-se em consideração, os objetivos a serem otimizados por meio de técnicas multiobjetivo, observando principalmente, os desvios da tensão nos nós e as perdas de potência nas linhas do sistema. A metodologia proposta foi implementada em linguagem de modelagem algébrica com o AMPL para descrever o problema de otimização e resolvido usando o solver comercial CPLEX. Os sistemas testes de 34 e 123 nós foram utilizados para avaliar os modelos matemáticos e a eficiência da técnica de solução proposta para o problema de controle dos sistemas de distribuição radiais com GFs.
This work presents a methodology based on uncertainties of solar radiation to predict demand and reactive dispatch in the radial distribution systems with photovoltaic generators (GFs). The objective is to improve the voltage magnitude profile for a day ahead, subjecting to operation constraints of distribution system. In order to evaluate the optimization criteria for distribution networks, active power balance equations have to be solved. It is considered that distributed generators have a high coherence to variations of the primary energy source (mainly photovoltaic systems), where, the power injection limits of the GFs depend on the uncertainties of the solar radiation. Uncertainties in generation are needed to be considered for this type of generator. Thus, the beta probability distribution function has been employed to include different radiation scenarios in the problem formulation. The aim of this research evolves the development of an optimization tool to predict the reactive power dispatch of GFs considering the uncertainties of solar radiation. For this purpose, the probabilistic power flow is performed under various scenarios. The Multiobjective optimization problem is formulated by including the buses (nodes) voltage deviations and the power losses of distribution lines in two different objective functions. The proposed methodology was implemented in AMPL mathematical model language and solved using the commercial CPLEX solver. The 34 and 123 nodes test systems are applied to show efficiency of presented mathematical models, i.e. control of radial distribution systems with GFs, and the proposed solution method.
Meekhun, Dariga. "Réalisation d'un système de conversion et de gestion de l'énergie d'un système photovoltaïque pour l'alimentation des réseaux de capteurs sans fil autonomes pour application aéronautique." Thesis, Toulouse, INSA, 2010. http://www.theses.fr/2010ISAT0031/document.
Повний текст джерелаFlight tests of a commercial aircraft consist in gathering data during flight to validate aircraft design. However they are very expensive for various reasons. One of them is that most of the sensors implemented to collect data are wired. As an example, for the sole system that monitors the vibrations onboard a large (more than 100 seats) aircraft, more than 100 sensors may be deployed. Such networks are complex to implement, mainly because of the required wiring. A wireless solution is therefore of great interest; however, such a cable-less implementation implies both wireless transmission of data together with energy autonomy.The purpose of this work is therefore to describe a design of a power generation system, focusing on photovoltaic, together with the associated management strategies for an autonomous wireless sensor network deployed for large aircraft in-flight tests. This work is a part of SACER project. The main requirements are related to the thickness of the system (less than 3,2mm in order not to disturb the aerodynamic air flow) and the output power (3 W per sensor node in order to power the sensor, data processing and transmission system). In addition, the system has to properly work at extremely high and low temperature (-50 to 100°C). Our system consists of three primary components to consider: Energy Harvesting system, Energy storage device and Energy management system.In this work, we firstly present the comparison of the performance of different photovoltaic technologies at different temperatures concerning their availability and achievable power density in aircraft applications. Secondly, we will investigate the possibility of using batteries and supercapacitor. Finally the power management system, composed by a photovoltaic panel, a power conditioning (MPPT function), supercapacitors and a DC/DC regulator, is presented
Rocha, Kamila Peres. "Planejamento de microrredes em sistemas de distribuição de energia elétrica." Universidade Federal de Juiz de Fora (UFJF), 2018. https://repositorio.ufjf.br/jspui/handle/ufjf/8079.
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O presente trabalho apresenta uma metodologia para o planejamento ótimo de microrredes em redes de distribuição de energia elétrica. Para tanto, é apresentada a formulação dos elementos propostos incluindo sua modelagem técnico-econômica. O objetivo principal é a abordagem das vantagens do sistema de compensação de energia elétrica estipulado pela resolução normativa n◦ 482/2012 da ANEEL, na busca por redução dos custos de energia em um horizonte de planejamento de longo prazo. Para isso, faz-se a utilização da meta-heurística denominada SIA com propósito de obter o dimensionamento otimizado dos elementos da microrrede. A determinação dessa técnica se deve a quantidade de combinações possíveis devido a complexidade do problema apresentado. É traçado, ainda, um comparativo com o método de busca exaustiva para análise das soluções geradas e do tempo computacional requerido para as duas metodologias propostas. O projeto aborda a implantação de fontes de energia renovável eólica e solar e gerador a diesel para análise de estudos de caso para consumidores comercial e residencial. Por último, é realizado um comparativo com resultados provenientes de um software de dimensionamento de microrredes, denominado HOMER Pro R .
The present work presents a methodology for the optimal planning of microgrids in electricitydistributionnetworks. Forthatreason, theformulationoftheproposedelements includingtheirtechnical-economicmodelingispresented. Themainobjectiveistoapproach the advantages of the net metering stipulated by ANEEL normative resolution 482/2012, in the search for reduction of energy costs in a long-term planning horizon. Therefore, the meta-heuristic called SIA is implemented with the purpose of obtaining the optimized sizing of the elements of the microgrid. The determination of this technique come from the amount of possible combinations due to the complexity of the presented problem. A comparison with the exhaustive search method for the analysis of the generated solutions and the computational time required for the two proposed methodologies is also drawn. The project addresses the deployment of wind and solar renewable energy sources and diesel generator for analysis of case studies for commercial and residential consumers. Finally, a comparison is made with results from HOMER Pro R, a microgrid software.
Abi, Sejaan Georgina. "Energy harvesting and storage in multi-stable micro-actuator systems." Electronic Thesis or Diss., Compiègne, 2022. http://www.theses.fr/2022COMP2698.
Повний текст джерелаThe principle of energy harvesting is applied in this thesis to a wireless bistable micro-actuator system, developed in the Roberval laboratory. The bistable micro-actuator is made up of an antagonistic pre-shaped double beams, two shape memory alloy (SMA) elements and a laser source. The laser beam is used as a contactless energy transfer source to actuate the SMA elements. At their turn, SMA elements are the transitional components to activate the bistable beams among its two stable positions. From this context, the aim of this thesis is to harvest different types of unused available energies in this system. To start with, optical energy is harvested using the photovoltaic effect transforming optical energy into electrical energy. Moreover, due to the environment heating, the difference in temperature is harvested using thermoelectric effect transforming this difference in temperature into a voltage difference. The overall objective is to create two different playgrounds of energy harvesting in the system. The first one relies on harvesting only the optical energy. This design will be used when the micro-actuator requires an additional electrical energy without requiring high speed of actuation. However, when the speed represents a priority comparing to the electrical energy in demand, the micro-actuator switches to operate in the second playground where optical and thermal energies are harvested while the speed of actuation of the micro-actuator is higher than the first design
Gaptia, Maï Moussa Lawan. "Gestion optimale d'énergie électrique à partir des sources d'énergies renouvelables dédiées aux sites isolés Power control for decentralized energy production system based on the renewable energies — using battery to compensate the wind/load/PV power fluctuations Three level Neutral-Point-Clamped Inverter Control Strategy using SVPWM for Multi-Source System Applications Wind turbine and Batteries with Variable Speed Diesel Generator for Micro-grid Applications." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMLH28.
Повний текст джерелаThe thesis works are part of the research work of the thematic team: Mastery of Renewable Energies and Storage Systems (MERS) of the GREAH-EA3220 laboratory. They include the dimensioning of the constituent elements of the system and the optimal management of electrical energy for a hybrid system (Variable speed Diesel, Wind, PV and Batteries) dedicated to isolated sites. Power sources supply loads through multi-level converters of power electronics. The generator set with a variable speed diesel engine is considered to be the main source of energy used to control the DC voltage at the coupling point. This type of generator is chosen to optimize fuel consumption. It is used to deliver an electrical power compatible with the engine speed which does not tolerate frequent and rapid variations. Renewable energy sources whose share of energy is sought to meet demand are managed so as to instantly extract the maximum power available from resources (sunshine, wind). These thus impose their dynamics and their intermittences at the coupling point. The battery pack is used to compensate for rapid fluctuations in energy from renewable energy sources compared to a slower evolution supported by the generator. Interactions within the resulting hybrid electrical system are managed by means of multi-level static converters (AC / DC, DC / DC and DC / AC). An electrical energy management approach based on the frequency distribution of disturbances induced at the coupling point by renewable sources. An experimental platform on a reduced scale (1/22) has been developed to experimentally validate theoretical approaches and simulations. The results of simulations obtained in the Matlab / Simulink / SimPowerSystems software environment and those from the experimental device produced and piloted by dSPACE-1104 prove the adequacy of the proposed control methods
Klusáček, Jan. "Řízení toků energie v energetickém systému s více akumulačními jednotkami." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413128.
Повний текст джерелаRamond, Adrien. "Conception et réalisation d'une nouvelle architecture multi-entrées multi-sorties pour la gestion de micro puissance dans les systèmes autonomes." Phd thesis, INSA de Toulouse, 2011. http://tel.archives-ouvertes.fr/tel-00660368.
Повний текст джерелаGraziani, Alessandro. "Methods and tools for the optimization of renewable technologies and hybrid energy systems. Metodi e strumenti per l'ottimizzazione di tecnologie rinnovabili e sistemi energetici ibridi." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3423884.
Повний текст джерелаIl progetto delle Nazioni Unite "Sustainable energy for all" ha fissato tre obiettivi ambiziosi per favorire uno sviluppo sostenibile e limitare l'impatto del cambiamento climatico: - Accesso universale a moderni servizi elettrici. Tali servizi sono attualmente indisponibili per circa 1.3 miliardi di persone ed è previsto un aumento del 40% della domanda globale di energia elettrica entro il 2040, a causa dell'incremento della popolazione mondiale e delle economie in crescita nei paesi in via di sviluppo - Raddoppio del tasso globale di miglioramento dell'efficienza energetica - Raddoppio del contributo di fonti di tipo rinnovabile nel mix energetico globale Inoltre, lo scenario climatico proposto nel "fifth assessment report (AR5)" redatto da "International Panel on Climate Change (IPCC)" stabilisce la necessità di ridurre l'emissione di gas ad effetto serra del 40-70%, rispetto ai valori registrati nel 2010, entro il 2050 ed eliminarli in modo quasi definitivo entro la fine del secolo con lo scopo di evitare effetti climatici indesiderati. Il raggiungimento di tali obiettivi richiede e incoraggia la diffusione di fonti energetiche rinnovabili (FER) all'interno del mix energetico globale, rimpiazzando gradualmente le fonti di energia convenzionali basate su combustibili fossili, inquinanti e in via di esaurimento, che hanno ancora l'incidenza principale nel settore energetico. A seguito nel loro sviluppo tecnologico e la crescente competitività nel mercato, le FER rivestono già un ruolo fondamentale nel mix energetico di numerose Nazioni ricoprendo il 22.1% del fabbisogno globale di energia nel 2013 e mostrando un andamento in rialzo nel 2014 (REN, 2014). Tuttavia, sono ancora cruciali politiche di supporto, ingenti investimenti privati e contributi della comunità scientifica per dimostrare l'efficacia e la sostenibilità tecnica ed economica delle FER e favorire, quindi, una loro diffusione in larga scala. In questo contesto, la seguente tesi di dottorato è rivolta allo studio, progettazione e sviluppo di metodi e strumenti per l'ottimizzazione e la valorizzazione di tecnologie energetiche rinnovabili e la loro integrazione efficace con fonti di produzione di energia convenzionali alimentate da combustibili fossili e sistemi di accumulo di energia (Sistemi energetici di tipo ibrido). I contributi scientifici disponibili in letteratura e l'analisi dei diversi scenari e delle prospettive delle FER nei vari contesti nazionali ed internazionali hanno dimostrato che la loro sostenibilità economica, e quindi la loro diffusione, è strettamente legata ad una serie di parametri tecnici, economico / finanziari e geografici. Tali parametri sono stati impiegati come input in due modelli analitici sviluppati per la progettazione tecnico-economica di impianti fotovoltaici (FV) e micro turbine eoliche e applicati per lo studio della loro fattibilità economica, attraverso analisi multi-scenario, in alcuni dei maggiori Paesi Europei. I risultati ottenuti hanno mostrato come l'autoconsumo dell'energia prodotta rivesta un ruolo fondamentale nella redditività economica dei citati impianti ed, in particolare, a seguito del taglio parziale o totale dei sistemi di incentivazione e l'incertezza attorno alle politiche di supporto all'interno del panorama Europeo. Lo studio specifico del profilo di domanda elettrica delle utenze e l'impiego di sistemi di accumulo di energia sono stati identificati come strategie efficaci al fine di incrementare la quota di autoconsumo. Tali considerazioni hanno portato allo sviluppo di un modello analitico utile alla progettazione tecnico-economica un sistema energetico ibrido connesso alla rete Nazionale integrante un impianto FV e un sistema di accumulo a batterie. La redditività del sistema, valutata su un caso reale, risulta comparabile a un impianto fotovoltaico privo di batterie in caso di un gap significativo tra il costo dell'energia elettrica acquistata dalla rete e il prezzo di vendita dell'energia elettrica ceduta in rete. Tuttavia, gli elevati costi dovuti all'acquisto iniziale e alle attività di manutenzione, e l'eventuale incentivazione sulla vendita dell'energia in rete, non rendono l'investimento particolarmente attrattivo per impianti connessi alla rete. L'attenzione si è quindi rivolta all'analisi tecnico-economica di sistemi energetici ibridi non connessi alla rete, comunemente definiti in isola o off-grid, per soddisfare il fabbisogno energetico di utenti in area remote e quindi prive di allaccio a una rete elettrica. In tali sistemi, i sistemi di accumulo a batterie, oltre alla capacità di accumulo dell'energia prodotta in eccesso variabili e intermittenti FER, hanno funzioni fondamentali nella gestione del sistema stesso. L'attività è stata anche rafforzata da un'applicazione industriale per la configurazione, test e installazione di due sistemi energetici ibridi in isola impiegati per soddisfare il fabbisogno energetico di un villaggio e di un sistema di telecomunicazione situati in aree remote. In parallelo, sono state svolte due attività sperimentali applicate alla promettente, ma non ancora completamente sviluppata a livello industriale, tecnologia solare a concentrazione. La prima attività riguarda la progettazione, sviluppo e test sperimentali di un prototipo in scala ridotta di concentratore solare a lenti di Fresnel per la produzione distribuita di energia elettrica, mediante l'uso di celle fotovoltaiche multi giunzione, ed energia termica a bassa temperatura, tramite un sistema di recupero termico. La seconda attività concerne lo sviluppo e test sperimentali di un prototipo di sistema di accumulo termico per impianti termodinamici alimentati da sistemi a concentrazione solare. Il sistema di accumulo consente di compensare la natura intermittente e variabile della fonte solare incrementando le ore di funzionamento dell'impianto termodinamico con i conseguenti benefici economici. Concludendo, la presente tesi di dottorato include la descrizione di metodi e strumenti per l'ottimizzazione e valorizzazione delle FER. I risultati evidenziano le criticità e potenzialità dei sistemi studiati con lo scopo di contribuire a una loro diffusione e favorire uno sviluppo sostenibile
Chlebný, Radek. "Autonomní dům aneb život grid-off." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220159.
Повний текст джерелаMAYER, ERIC RENE. "Contribution au developpement des ecotechniques en amerique latine et au venezuela." Paris 7, 1987. http://www.theses.fr/1987PA077224.
Повний текст джерелаCroci, Lila. "Gestion de l'énergie dans un système multi-sources photovoltaïque et éolien avec stockage hybride batteries/supercondensateurs." Phd thesis, Université de Poitiers, 2013. http://tel.archives-ouvertes.fr/tel-00943296.
Повний текст джерелаHou, Po-Wen, and 侯博聞. "The Study of Low Power Photovoltaic Generators." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/57709099037750965240.
Повний текст джерела國立交通大學
光電工程研究所
84
Due to the continual development of IC technology, the low power PVG(PhotoVoltaic Generator) has become very important in the microelectronics applications. The purpose of this thesis is to study the optical penetration of different wavelengths on two kinds of biological tissues and the electric features (open voltage and short current) of PIN diodes placed inside the tissues which are casted light from outside by using LEDs of various wavelengths. The pacemaker is used as an example to illustrate the applications of photodiodes in low power photo- voltaic generators.
HSIEH, YA-TING, and 謝雅婷. "A Study on Power Quality Issues of Grid-Interactive Photovoltaic Generators." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/00343509740282205767.
Повний текст джерела國立雲林科技大學
電機工程系
104
This thesis discusses power quality problems steming from solar power generation units connecting to power grid. Nowadays, popularity of renewable energy has made synchronization one of the necessary technologies in the grid interface. In a single-phase PV inverter, stationary and synchronous coordinate transformation has allowed the grid voltage, frequency and phase to be tracked and synchronized. The phase-locked-loop (PLL) model is first built in the Alternative Transients Program (ATP) to observe if overvoltage happens at the point of common coupling (PCC) since a three-phase feeder may contain several single-phase PV generators. Voltage and current unbalance and impact analysis at the PCC of centralized and distributed grid-connection configurations are also studied. Finally, intentional islanding in a micro grid is simulated using the ATP taking the IEEE 929 and the UL 1741 as the standards. The intentional islanding in micro grid is simulated according to the standards to observe variations of voltage and frequency at the PCC and the capacity curve of the islanding region. Simulation results show that the voltage and frequency at the PCC go through transient fluctuations and gradually become stable when the islanding region and the grid is uncoupled, conforming to the limits set by the standards of avoiding islanding operation.
Lasich, John. "The design and optimisation of a reflective concentrator photovoltaic generator system." Thesis, 2009. https://vuir.vu.edu.au/30252/.
Повний текст джерелаBello, Mashood Mobolaji. "Spatial modeling and dynamics of a photovoltaic generator for renewable energy application." Thesis, 2006. http://hdl.handle.net/10413/10368.
Повний текст джерелаThesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2006.
Wu, Wei-Lun, and 吳瑋倫. "The Maximum Power Tracking Control for Photovoltaic Array Generators Based on T-S Fuzzy Approach." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/93702467603797440534.
Повний текст джерела中原大學
電機工程研究所
95
A micro-grid power system consisting of a photovoltaic (PV) array panel, DC/DC converter, and a battery is considered in this research. This thesis proposes a T-S fuzzy method to deal with the power tracking problem of the power generating systems. The T-S fuzzy model can represent nonlinear systems into fuzzy rules with consequent part as local linear subsystems. Then, the stability analysis is carried out using Lyapunov direct method where as the control problem is formulated into the feasibility of solving a set of linear matrix inequality (LMIs). The satisfactory performance is firstly shown by the numerical simulation result. Then, we focus on the experiment on the hardware realization. To this end, we establish an experiment environment for the solar power system, which includes an SP75 solar module, a DC/DC buck converter, an A/D DS1103 card, and a real-time interface, dSPACE. Then, the experiment is carried to verify the proposed scheme.
Yan, Bo-Yi, and 顏柏毅. "Design of a Hybrid Battery Charger System Fed by a Wind-Turbine and Photovoltaic Power Generators." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/95743789292397906721.
Повний текст джерела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
This thesis aims to develop a digital signal processor to control a solar cell and wind turbine hybrid charging system, using solar cells, a wind turbine, and a lead acid battery in order to construct a buck-boost converter. The solar cells and wind turbine serve as the system’s main power sources, and the battery to stores energy. The output power of solar cells and wind turbine have large fluctuations according to changes in weather and climate conditions, unstable power may be adjusted to the most suitable output, with a buck-boost converter. This study designed a booster using a dsPIC30F4011 digital signal controller as its core, which is controlled by the perturbation and observation methods in order to obtain an effective energy circuit, with a complete 100W charging system. Using a digital signal controller as a core, and relatively simple circuit components, this generator can be easily controlled and charged, day and night, by a simple program that reads weather conditions and makes changes to the state of the system’s circuits through a flexible application.
Hsu, Tao-an, and 徐道安. "Maximum Power Point Tracking for Photovoltaic Generations with Solar Irradiance and Temperature Estimation." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/8e8kjx.
Повний текст джерела國立中山大學
電機工程學系研究所
103
The output power of Photovoltaic Generations (PVGs) varies with solar irradiance and temperature nonlinearly. Therefore, the Maximum Power Point Tracking (MPPT) is very important to operate PVG to harvest the maximum solar energy in real time. However, it is difficult to find the maximum power point in the rapidly changing weather conditions with minimal loss. This thesis proposes a state-estimation-based MPPT for PVGs. Based on the measured voltages and currents and the characteristic output function of PVG, the proposed MPPT uses state estimation to calculate the solar irradiance and temperature directly. The operating voltage of maximum power point can also be found immediately. The proposed MPPT can effectively reduce the maximum power tracking time of conventional MPPT methods and increase the harvested powers during MPPT. Simulation and experimental results comparing the proposed MPPT to a Perturbation and Observation (P&;O) MPPT demonstrate the performance achieved by the proposed MPPT.
Lin, Bo-Chen, and 林柏辰. "ON A DC MICRO-GRID WITH PHOTOVOLTAIC SOURCE AND WIND DRIVEN PERMANENT- MAGNET SYNCHRONOUS GENERATOR." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/33477646777334923475.
Повний текст джерела國立清華大學
電機工程學系
100
This thesis presents the development and operation control of a DC microgrid with photovoltaic (PV) cell and wind permanent-magnet synchronous generator (PMSG). A single-phase three-wire (1P3W) 60Hz 220V/110V load inverter is equipped for making its operation performance test. The robust controls for the developed bidirectional 1P3W inverter are proposed to yield good AC output voltage waveforms and good line drawn current in switch mode rectifier (SMR) operation mode. The PV source is interfaced to the common DC bus of microgrid via two interleaving boost DC/DC converters. Smaller PWM ripples and rating enlargement of the established converter are preserved thanks to the interleaving approach. The maximum power point tracking (MPPT) control is also applied to extract the solar energy as effective as possible. As to the wind PMSG, it is connected to the common DC bus through a properly designed Vienna three-phase SMR. Sinusoidal armature winding currents are obtained using only three power switches. The effects of commutation shift on the generating performance of an SPMSM are also studied experimentally. The developed microgrid is supported by an energy storage system including a Li-ion battery, a supercapacitor and a flywheel. Each storage device is interfaced to the common DC bus by an one-leg bidirectional DC-DC converter. Good charging and discharging characteristics of each device are achieved through proper schematic and controller designs. And the effective use of energy storage to improve the microgrid power quality can be obtained by properly dispatching these storage devices according to their response characteristics and capacities. Moreover, the charges of these devices can be made via the plug-in a charger formed by the 1P3W inverter from mains for the occurrence of long-term renewable energy exhaustion. While the Vienna SMR is implemented employing a specific power module, all other constituted interface converters of PV source, energy storage devices and 1P3W inverter are constructed using two three-phase intelligent power modules. The digital control algorithms of all power stages are realized using digital signal processor (DSP). Some experimental results are provided to demonstrate their performances.