Дисертації з теми "Control system- AC and DC microgrids"
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Perez, Filipe. "Control of AC/DC Microgrids with Renewables in the Context of Smart Grids : Including Ancillary Services and Electric Mobility." Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASG011.
Повний текст джерелаMicrogrids are a very good solution for current problems raised by the constant growth of load demand and high penetration of renewable energy sources, that results in grid modernization through “Smart-Grids” concept. The impact of distributed energy sources based on power electronics is an important concern for power systems, where natural frequency regulation for the system is hindered because of inertia reduction. In this context, Direct Current (DC) grids are considered a relevant solution, since the DC nature of power electronic devices bring technological and economical advantages compared to Alternative Current (AC). The thesis proposes the design and control of a hybrid AC/DC Microgrid to integrate different renewable sources, including solar power and braking energy recovery from trains, to energy storage systems as batteries and supercapacitors and to loads like electric vehicles or another grids (either AC or DC), for reliable operation and stability. The stabilization of the Microgrid buses’ voltages and the provision of ancillary services is assured by the proposed control strategy, where a rigorous stability study is made. A low-level distributed nonlinear controller, based on “System-of-Systems” approach is developed for proper operation of the whole Microgrid. A supercapacitor is applied to deal with transients, balancing the DC bus of the Microgrid and absorbing the energy injected by intermittent and possibly strong energy sources as energy recovery from the braking of trains and subways, while the battery realizes the power flow in long term. Dynamical feedback control based on singular perturbation analysis is developed for supercapacitor and train. A Lyapunov function is built considering the interconnected devices of the Microgrid to ensure the stability of the whole system. Simulations highlight the performance of the proposed control with parametric robustness tests and a comparison with traditional linear controller. The Virtual Synchronous Machine (VSM) approach is implemented in the Microgrid for power sharing and frequency stability improvement. An adaptive virtual inertia is proposed, then the inertia constant becomes a system’s state variable that can be designed to improve frequency stability and inertial support, where stability analysis is carried out. Therefore, the VSM is the link between DC and AC side of the Microgrid, regarding the available power in DC grid, applied for ancillary services in the AC Microgrid. Simulation results show the effectiveness of the proposed adaptive inertia, where a comparison with droop and standard control techniques is conducted
Farhadi, Mustafa. "Hybrid Energy Storage Implementation in DC and AC Power System for Efficiency, Power Quality and Reliability Improvements." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2471.
Повний текст джерелаSalehi, Pour Mehr Vahid. "Development and Verification of Control and Protection Strategies in Hybrid AC/DC Power Systems for Smart Grid Applications." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/804.
Повний текст джерелаLiu, Jianzhe. "On Control and Optimization of DC Microgrids." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1512049527948171.
Повний текст джерелаLo, Franco Francesco. "Integrazione di sistemi di accumulo a batterie e impianti fotovoltaici di grande taglia per applicazioni grid-connected." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Знайти 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.
Obradovic, Danilo. "Coordinated Frequency Control Between Interconnected AC/DC Systems." Licentiate thesis, KTH, Elkraftteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280156.
Повний текст джерелаQC 20200907
multiDC - Advanced Control and Optimization Methods for AC and HVDC Grids
White, Terence H. "A three-phase hybrid dc-ac inverter system utilizing hysteresis control." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FWhite%5FTerence.pdf.
Повний текст джерелаMohamed, Samy. "Control and Optimization of Energy Storage in AC and DC Power Grids." FIU Digital Commons, 2019. https://digitalcommons.fiu.edu/etd/3967.
Повний текст джерелаShen, Li. "Model integration and control interaction analysis of AC/VSC HVDC system." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/model-integration-and-control-interaction-analysis-of-acvsc-hvdc-system(2d4bcb21-a97f-4c7f-b413-1a2a54086145).html.
Повний текст джерелаGonzalez-Torres, Juan Carlos. "Transient stability of high voltage AC-DC electric transmission systems." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS041.
Повний текст джерелаThe new policy frameworks adopted by national authorities has encouraged the large scale-integration of Renewable Energy Systems (RES) into bulk power systems. The large-scale integration of RES will have consequences on the electricity transmission system as it is conceived today, since the transmission of bulk power over long distances could lead the existing transmission systems to work close to their limits, thus decreasing their dynamic security margins. Therefore more complex transmissions systems are needed.Under this scenario, HVDC transmission systems raise as the most attractive solution for the reinforcement and improvement of existing AC networks, not only using point-to-point configurations, but also in a Multi-Terminal configuration. The introduction of HVDC transmission systems will eventually result in a hybrid high voltage AC/DC power system, which requires to be analyzed as a unique system in order to understand the interactions between the AC network and the DC grid.This thesis addresses the transient stability analysis of hybrid AC/DC electric transmission systems. More in particular, two questions sought to be investigated: What is the impact of a DC contingency on AC transient stability? How can we take advantage of the of DC transmission systems as control inputs in order to enhance AC transient stability?In the first part of this work, the mathematical models of the hybrid AC/DC grid are described as well as the necessary tools for the analysis of the system taking into account its nonlinear nature. Then, a thorough analysis of transient stability of the power system in the particular case of a DC fault and the execution of the corresponding protection strategies is done. As a complement, stability indicators and tools for sizing future MTDC grids in order to respect the constraints of existing protection strategies are proposed.The second part of the thesis addresses the control proposals for the modulation of power references of the HVDC transmission systems with the purpose of transient stability enhancement of the surrounding AC system. Firstly, we focus our study in the nonlinear control of point-to-point HVDC links in hybrid corridors. Fast power compensation, injection of damping power and injection of synchronizing power are identified as the mechanisms through which HVDC systems can improve stability margins.Finally, a control strategy for transient stability enhancement via active power injections of an MTDC grid is proposed. Using communication between the stations, the proposed decentralized control injects damping and synchronizing power between each pair of converters using only measurements at the converters level. The proposed implementation allows to fully use the available headroom of the converters by dealing with power limits in a decentralized way
Malo, Barragán Shane Leonardo. "Design and Control of an Electric Energy Conditioning System for a PEM Type Fuel Cell." Doctoral thesis, Universitat Politècnica de Catalunya, 2009. http://hdl.handle.net/10803/5957.
Повний текст джерелаModern designs are being pushed towards cleaner technologies. The experience has shown that the usual methods employed to produce electrical energy are not sustainable, especially because of environmental concerns. Usual stand-alone energy generation systems employ batteries and fuel engines. Batteries offer a cheap mean to feed the generation system but need rigorous maintenance routines, the substances used in their construction are strong pollutants, offer relatively low durability and the ratio charge time/discharge time is too high. Fuel engines extract their energy from petroleum based fuels, and as its well known, pollute their surrounding environment in several ways producing smoke, noise and heat.
Polymer electrolyte membrane type fuel cells are among the new technologies that are being considered as a good alternative to the traditional power sources used for stand-alone energy generation systems.
AIthough the basic principles of operation of the fuel cells are known since 1839, this is a technology that is far from being mature. More work needs to be done in order to make of the fuel cells systems with, high reliability, with maximum efficiency, and capable of providing electrical energy with quality comparable to the quality achieved using usual methods.
The problems when working with fuel cells can be split in two big groups of interest, the first, being the handling and control of the electrochemical variables, and the second, the handling and control of the electrical variables taking care of the limits imposed by the dynamics of the fuel cell unit. This work deals with the second group of concerns, looking at the fuel cell as a black-box dc power supply with certain current/voltage characteristics. The energy provided by the fuel cells needs to be conditioned to the levels and characteristics required by the loads to be fed. In Europe, for single-phase ac loads, the specifications are a sinusoidal output voltage with 230 V ac rms and a frequency of 50 Hz. This work presents the the analysis, design, construction, and control of the electric energy conditioning system for a polymer eIectrolyte membrane type fuel cell to act as an stand-alone dc-ac inverter to feed linear or nonlinear loads with big variations.
Los sistemas de generación de energía eléctrica "en isla" son necesarios en muchas ocasiones para alimentar cargas donde la red eléctrica no está disponible. Esto puede deberse a diversos factores como: aislamiento geográfico, necesidad de movilidad de la carga, requerimientos de corriente y voltaje que no son compatibles con las redes locales, etc. Todas estas razones hacen del diseño y construcción de sistemas autónomos de generación de energía una necesidad.
En la actualidad, los diseños de este tipo de dispositivos están tendiendo hacia tecnologías más limpias.
La experiencia ha enseñado que los métodos habituales para producir energía eléctrica no son los más apropiados, especialmente por motivos medioambientales. Los sistemas autónomos de generación de energía eléctrica típicos utilizan baterías y máquinas de combustión. Las baterías ofrecen una fuente barata para alimentar el sistema de generación de energía eléctrica, pero necesitan de rigurosas rutinas de mantenimiento, algunas de las sustancias utilizadas en su construcción son altamente contaminantes, ofrecen una relativamente baja durabilidad y la razón tiempo de carga/tiempo de descarga es grande.
Por otro lado, las máquinas de combustión extraen la energía de combustibles a base de petróleo, como es bien conocido, contaminan el entorno produciendo humo, ruido y calor.
Las pilas de combustible de membrana de electrolito polimérico están entre las nuevas tecnologías que se consideran como una buena alternativa a las fuentes que se utilizan usualmente para alimenta sistemas autónomos de generación de energía. Aunque los principios básicos de operación de las pilas de combustible son conocidos desde 1839, esta es una tecnología que está aún lejos de pode considerarse madura. Aún es necesario realizar más esfuerzos con el objetivo de hacer de las pilas de combustible fuentes de energía de alta confiabilidad, de máxima eficiencia y capaces de proveer energía con niveles de calidad comparables a los alcanzados al utilizar los métodos tradicionales.
La problemática que se presenta al trabajar con pilas de combustible puede ser dividida en dos grandes grupos de interés, el primero, sería el control de las variables electroquímicas, y el segundo, el manejo control de las variables eléctricas tomando en cuenta los límites impuestos por la dinámica de la pila de combustible. Éste trabajo trata con el segundo, viendo la pila de combustible como una "caja negra" que constituye una fuente de potencia de corriente continua con ciertas características particulares de voltaje/corriente. La energía provista por la pila de combustible debe ser acondicionada a los niveles características requeridas por las cargas a ser alimentadas. En Europa, para sistemas de monofásico de corriente alterna, las especificaciones son un voltaje sinusoidal con 230 V efectivos y una frecuencia de 50 Hz. Éste trabajo presenta el análisis, diseño, construcción y control del sistema de acondicionamiento de energía eléctrica para una pila de combustible de membrana de electrolito polimérico, que actúa como un sistema autónomo de inversión de corriente continua-corriente alterna para alimentar cargas lineales o no lineales que pueden experimentar grandes variaciones.
Alves, Montanari Allan. "Enhanced instantaneous power theory for control of grid connected voltage sourced converters under unbalanced conditions." IEEE Transactions on Power Electronics, 2017. http://hdl.handle.net/1993/32184.
Повний текст джерелаMay 2017
Qoria, Taoufik. "Nouvelles lois de contrôle pour former des réseaux de transport avec 100% d’électronique de puissance." Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAE041.
Повний текст джерелаThe rapid development of intermittent renewable generation and HVDC links yields an important increase of the penetration rate of power electronic converters in the transmission systems. Today, power converters have the main function of injecting power into the main grid, while relying on synchronous machines that guaranty all system needs. This operation mode of power converters is called "Grid-following". Grid-following converters have several limitations: their inability to operate in a standalone mode, their stability issues under weak-grids and faulty conditions and their negative side effect on the system inertia.To meet these challenges, the grid-forming control is a good solution to respond to the system needs and allow a stable and safe operation of power system with high penetration rate of power electronic converters, up to a 100%. Firstly, three grid-forming control strategies are proposed to guarantee four main features: voltage control, power control, inertia emulation and frequency support. The system dynamics and robustness based on each control have been analyzed and discussed. Then, depending on the converter topology, the connection with the AC grid may require additional filters and control loops. In this thesis, two converter topologies have been considered (2-Level VSC and VSC-MMC) and the implementation associated with each one has been discussed. Finally, the questions of the grid-forming converters protection against overcurrent and their post-fault synchronization have been investigated, and then a hybrid current limitation and resynchronization algorithms have been proposed to enhance the transient stability of the system. At the end, an experimental test bench has been developed to confirm the theoretical approach
Zadeh, Ramin Agha. "Performance control of distributed generation using digital estimation of signal parameters." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/47011/1/Ramin_Agha_Zadeh_Thesis.pdf.
Повний текст джерелаPullaguram, Deepak Reddy. "Distributed control strategies for AC and DC microgrids." Thesis, 2018. http://eprint.iitd.ac.in:80//handle/2074/7925.
Повний текст джерелаFernandes, Fábio André. "Desenvolvimento dos conversores de potência para o sistema de alimentação de um centro social sustentável isolado." Master's thesis, 2015. http://hdl.handle.net/1822/54584.
Повний текст джерелаA crescente motivação para a utilização de fontes de energias renováveis prende-se essencialmente com a redução das emissões de CO2 e com a melhoria da qualidade de vida da humanidade. Isto é especialmente verdade em comunidades pequenas, isoladas e autónomas, onde o acesso a fontes de energia renováveis é a única solução para satisfazer as suas necessidades energéticas. Nesta dissertação são estudados os sistemas de eletrónica de potência e os restantes constituintes de uma microrrede que permitem o funcionamento de um Centro Social Sustentável numa aldeia rural isolada, sem ligação a uma rede de energia elétrica. Estes incluem a produção de energia elétrica por fontes renováveis e por um motor-gerador (a biodiesel), um sistema de armazenamento de energia, e um conjunto de cargas locais. Especificamente, nesta dissertação é desenvolvido o sistema de alimentação da microrrede isolada. Este sistema é constituído por um conversor de potência CC-CA de três estágios que pode ser dividido num conversor CC-CC em ponte completa isolado de alta-frequência do tipo buck, controlado a MOSFETs e por um conversor CC-CA em ponte completa controlado a IGBTs. O sistema de controlo dos conversores é completamente digital e tem por base o DSC TMS320F28335 da Texas Instruments. Para validar a solução apresentada, foi desenvolvido um protótipo do sistema que engloba os dois conversores mencionados. Posteriormente, foram realizados diversos testes experimentais em ambiente laboratorial ao protótipo implementado. Este foi testado com uma tensão de entrada de 30 V que foi elevada para uma tensão constante de 160 V por intermédio do conversor CC-CC. Esta tensão retificada é posteriormente convertida para uma tensão sinusoidal de 132 V de pico a uma frequência de 50 Hz, através do inversor monofásico. Nestas condições, foi comprovado o conceito e validado o funcionamento do sistema de alimentação da microrrede isolada. Ao mesmo tempo, os resultados obtidos permitiram validar tanto o bom funcionamento do controlador proporcional-integral aplicado ao conversor CC-CC, como o controlador preditivo deadbeat aplicado ao conversor CC-CA.
The increasing motivation for the use of renewable energy sources is mainly due to the reduction of CO2 emissions and to the improvement of mankind life quality. This is particularly true in small, isolated and standalone communities, where the access to renewable energy sources may be the only solution to meet their energy needs. This master thesis aims to study the power electronic systems that allow the operation of a sustainable Social Centre in an islanded rural village without connection to a main power grid. These include the production of electricity from renewable sources and a motorgenerator set (biodiesel), an energy storage system, and a local power supply. Specifically in this work, the developed power converter needed for the microgrid power system is a three stage DC-AC converter. This power converter can be separated into a DC-DC full-bridge high-frequency isolated MOSFET-based converter and a DC-AC full-bridge IGBT-based converter. The control system is fully digital and implemented using the Texas Instruments microcontroller DSC TMS320F28335. In order to validate the presented solution was developed a prototype of the microgrid power system constituted by the converters mentioned and several experimental tests were carried out in laboratory environment. The developed prototype was tested with a 30 V DC input voltage which resulted in a constant 160 V DC voltage controlled by the DC-DC MOSFET-based converter. This rectified voltage is then converted to a sinusoidal wave with 132 V of peak at 50 Hz frequency by the single-phase inverter. Under these conditions, the concept has been proven and the proper functioning of the island microgrid power system was validated. At the same time, the obtained results allowed to validate not only the proper functioning of the proportional integral controller applied to the DC-DC converter but also the deadbeat predictive controller applied to the DC-AC converter.
Abuhilaleh, Mohammad Mahmoud Jamil. "Power Management and Control Strategies in Hybrid AC/DC Microgrids." Thesis, 2020. http://hdl.handle.net/10453/143867.
Повний текст джерелаThe future trend of the power system is to ensure reliable, flexible, affordable and efficient power supply for customers with lower emissions. Conventional AC or DC microgrid suffers from increased losses and lower efficiency due to several AC-DC and DC-AC conversions. Therefore, hybrid microgrid (HMG) is getting popular to meet the growing penetration of modern DC loads and renewable energy sources with DC outputs into the existing AC power systems. The main objective of this dissertation is to develop and implement improved power management and control strategy to improve the performance of the hybrid microgrid. The first study proposes an improved power management and control coordination strategy for an autonomous HMG. The HMG considered in this part consists of multiple AC and DC sub-microgrids (SMGs) with different voltage levels. The hierarchical coordination of power management and control strategy for the autonomous HMG is introduced and analyzed. The designed system incorporates both the primary and secondary control levels to ensure a seamless and accurate transfer of power among the SMGs. A new technique for transferring power with a focus on the secondary control level is presented. The second study proposed in this thesis is a novel approach of distributed coordination control for multiple SMGs within the HMG. The traditional control method for power flow management among AC and DC SMGs is based on the proportional power-sharing principle. The proposed method suggests a distributed control system that ensures total controllability for the parallel interlinking converters (ILCs). It overcomes the total dependency on a specific variable for power exchange. The proposed method not only enables control of the power flow between SMGs but also ensures the continuity of power transfer in the event of a single SMG failure. The third study in this work focuses on coordinating the control and power management strategy for the multiple parallel ILCs that link the AC and DC SMGs together. The proposed new approach aims to manage the power flow across the HMG while regulating the voltage and frequency for the SMGs as part of the process. The main objective of the proposed method is to keep the HMG in autonomous operation with active power proportionally shared among its ILCs and distributed sources. The presented outer control loop is a modified arrangement that could not only ensure accurate power-sharing but also suppresses the circulating current at the DC side.
Salgado, César Eduardo Marques. "Desenvolvimento dos conversores de potência para o sistema de alimentação de uma microrrede isolada baseada em energias renováveis." Master's thesis, 2018. http://hdl.handle.net/1822/60000.
Повний текст джерелаA energia elétrica tem um papel extremamente importante no desenvolvimento de uma região, bem como na melhoria da qualidade de vida do ser humano. É assim fundamental eletrificar regiões isoladas e com elevadas taxas de subdesenvolvimento. A eletrificação da grande maioria destas regiões isoladas, passa pela produção local de energia recorrendo a fontes de energia renovável, quer por razões logísticas quer ambientais. Nesta dissertação são apresentados e descritos, os sistemas de eletrónica de potência que permitem implementar uma microrrede isolada com produção a partir de fontes renováveis e capacidade de armazenamento local de energia. O foco principal deste trabalho é o desenvolvimento e validação do sistema responsável pela implementação de uma microrrede isolada monofásica com tensão alternada sinusoidal de 230 V/50 Hz. O desenvolvimento do sistema responsável pela produção e armazenamento de energia encontra-se descrito numa dissertação com o tema complementar, realizada pelo colega de laboratório João Silva. Para a realização da presente dissertação foi necessário o estudo, dimensionamento e implementação do conversor CC-CA de três estágios. Este conversor pode ser dividido num conversor CC-CC em ponte completa isolado de alta frequência do tipo buck e num conversor CC-CA em ponte completa. Para ambos os conversores foi desenvolvido um controlador digital, sendo utilizado um controlador Proporcional Integral no conversor CC-CC e um controlador Preditivo no conversor CC-CA monofásico. Depois de desenvolvido o protótipo do sistema de alimentação da mirorrede isolada, foram realizados alguns ensaios laboratoriais de modo a validar a solução apresentada. Os ensaios realizados, permitiram analisar o comportamento do sistema para três tipos de carga diferentes: carga linear puramente resistiva; carga linear predominantemente indutiva; e carga não linear do tipo retificador com filtro capacitivo. Por último, foram ainda realizados alguns ensaios ao sistema desenvolvido na presente dissertação, interligado com o sistema complementar desenvolvido pelo colega João Silva. Perante os resultados obtidos, foi possível comprovar o conceito e validar o funcionamento do sistema de alimentação da microrrede isolada.
Electric power plays an essential role in the development of an isolated rural region, as well as in improving the overall human well-being. Therefore, the electrification of isolated and underdeveloped zones is a matter of extreme importance. Due to either logistic or environmental reasons, in most of these isolated regions, the required electrification involves the local energy production through renewable energy sources. In this dissertation, the power electronics system that allows the implementation of an islanded microgrid with local production and storage of energy is presented and described in detail. The main focus of this work is the development and validation of the power electronics system to implement a single-phase islanded microgrid with 230 V/50 Hz sinusoidal voltage. The electronic system responsible for energy production and storage is being developed within the dissertation work of the classmate João Silva. In order to complete this dissertation, it was required to study, sizing and implement a three-stage DC-AC converter. This converter is composed of a high-frequency isolated buck type full-bridge DC-DC converter and of a single-phase full-bridge DC-AC converter. A digital controller was developed for both converters, namely a Proportional Integral in the case of the DC-DC converter and a Predictive Deadbeat in the case of the DC-AC converter. After the development of the islanded microgrid power system prototype, some laboratorial tests were carried out to analyze the response of the presented solution. The elaborated tests allowed the analysis of the converters toward three different loads: a purely resistive linear load; a predominantly inductive linear load; and a rectifier with capacitive filter nonlinear load. Finally, a few tests were done on the system developed in the presented dissertation combined with the complementary system developed by João Silva. Concerning the final results, it was possible to prove the concept and to validate the operation of the islanded microgrid power system.
Krishan, Ram. "Stability and optimization of ac/dc power systems." Thesis, 2018. http://localhost:8080/xmlui/handle/12345678/7707.
Повний текст джерелаShen, Sin-Ying, and 沈信穎. "Applied to the LED driver of AC to DC converter control chip design and system integration." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/12297631864333944586.
Повний текст джерела國立雲林科技大學
電子工程系
103
With the changing times and the advancement of technology, electronic products continue to developat a rapid pace. Every electronic product needs supply driver. This research designs LED lamp power management system with AC to DC power conversion mode. This researchadopt the process of TSMC 0.25 um CMOS HIGH VOLTAGE MIXED SIGNAL to complete two chips, and be off the assembly line of TSMC through CIC. The chips are (1) with level shift High-voltage converter chip (2) AC / DC voltage (current) feedback PWM controller chip. With level shift High-voltage converter chip contains huge Power Management System, which saves the costs and reduces the volume. The chip’s input voltage is designed below 60V. It can automatically adjust the load output voltage. AC / DC voltage (current) feedback PWM controller chiphas been used in the design of buck system in Flyback circuit architecture. It can use primary or secondary ring mode feedback loop to control the output voltage and current and over-voltage and over-current protection, and the frequency can be adjusted in accordance with the design requirements. In addition, this research accomplishes two system circuits which are (1) AC to DC voltage automatic tracking system and (2) Isolated AC-DC converter step-down system. AC to DC voltage automatic tracking system avoids applyingmismatched voltages tandem to different LED driving. Too much driving voltage will cause excess loss of LED or drive circuit. As a result, this research designs voltage automatic tracking system to automatically find the drive voltage to supply corresponding loads and conserve power. Isolated AC-DC converter step-down system use PT6917, PT6919 and LD7830 driving chips in the Flyback circuit architecture to design a buck system. Actuating the four-color LED lights as a goal, the current system’s output voltage is 30V, current 1A, power factor 0.97, and efficiency 89%.
Pathak, Nikhil. "Discrete data automatic generation control of multi-area hydro-thermal power system under different operating conditions with AC-DC links." Thesis, 2018. http://localhost:8080/xmlui/handle/12345678/7630.
Повний текст джерелаHuang, Wen-Lung, and 黃文隆. "Implementation of a Sinusoidal Current Injected Three-phase AC-DC Converter with Bi-direction Power Flow Control for an Elevator Traction System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/44anjw.
Повний текст джерела國立臺北科技大學
電機工程系所
97
The main purpose of this thesis focuses on implementation of a three-phase AC-DC converter with bi-directional power flow control for elevator’s traction system. The converter not only provides the power regeneration to grid when elevator breaking, but also ensures the power factor is near 1 to meet the international standards and regulations. The control strategy of this thesis is based on cascade control of current and voltage loop to force three-phase currents as sinusoidal, power factor near 1, and stable DC-link voltage. Good current command tracking and better load regulation of DC-link voltage are yielded using synchronous frame vector control. Moreover, a paralleled three-phase AC-DC converter for energy regeneration is developed to reduce power capacity of the converter and fulfill the requirements for different applications. All the control schemes are full-digitally implemented using a RISC-based MCU - Renesas SH 7137. To achieve the purpose for increasing the software execution efficiency, the proposed control strategies are all coded by assembly language. Finally, the converter was fully tested on elevator tower to show the effectiveness of proposed control scheme.
Yesuratnam, G. "Development Of Algorithms For Security Oriented Power System Operation." Thesis, 2007. https://etd.iisc.ac.in/handle/2005/573.
Повний текст джерелаYesuratnam, G. "Development Of Algorithms For Security Oriented Power System Operation." Thesis, 2007. http://hdl.handle.net/2005/573.
Повний текст джерелаRodrigues, Ana Maria da Cunha. "Desenvolvimento do conversor CC-CA trifásico de um sistema de advanced load-shift." Master's thesis, 2019. http://hdl.handle.net/1822/64778.
Повний текст джерелаDevido à previsível escassez e às desvantagens inerentes ao uso de combustíveis fósseis na produção de energia elétrica, tem-se vindo a apostar em fontes de energia renovável, nomeadamente a eólica e a solar fotovoltaica. Contudo, estes tipos de fontes apresentam como principais desvantagens a intermitência na produção de energia, bem como a necessidade de um equipamento de interface com a rede elétrica, que tipicamente introduz problemas de qualidade de energia elétrica (QEE). Assim, de forma a possibilitar a integração de fontes de energia renovável na rede elétrica e explorar os incentivos referentes aos períodos de menor procura de energia, surgem novas oportunidades relativamente aos sistemas de armazenamento e gestão de energia, nomeadamente, o conceito de load shifting. Neste sentido, a presente dissertação de mestrado encontra-se inserida no desenvolvimento de um sistema de load-shift com características avançadas. Este dispositivo permite a interface de um sistema de armazenamento de energia com a rede elétrica, simultaneamente com a compensação de problemas de qualidade de energia elétrica relacionados com a corrente, nomeadamente, harmónicos, desequilíbrios e potência reativa. Nesta dissertação é abordado o desenvolvimento do conversor CC-CA trifásico, responsável pela interface com a rede elétrica, absorvendo ou injetando energia elétrica, dependendo do modo de operação do sistema de armazenamento. Além disso, este conversor CC-CA permite a operação como filtro ativo paralelo (FAP) trifásico, sendo esta uma das principais contribuições para a operação do sistema. Ao longo do desenvolvimento desta dissertação, foi possível validar a topologia de conversor CC-CA trifásico com quatro braços a operar em diferentes modos, bem como o seu sistema de controlo. Estes modos envolveram um estudo teórico necessário à execução dos testes de simulação e validação experimental do desempenho do sistema implementado.
Recently, there has been a focus on renewable energy sources, namely wind and solar photovoltaic, due to the predictable scarcity and inherent drawbacks of the use of fossil fuels in the production of electric energy. However, these types of energy sources have their own shortcomings: the intermittence of energy production as well as the need for an electrical network interface device that typically introduces power quality (PQ) problems. Thus, to allow the integration of renewable energy sources in the grid and to explore the incentives for periods of lower energy demand, new opportunities arise regarding energy storage and management systems, namely the load shifting concept. In this context, the present master dissertation is focused on developing a system of load-shift with advanced characteristics. This device allows the interface of a system of energy storage with the electric network, while fixing the electrical power quality problems related to current harmonics, unbalances and reactive power. This investigation discusses the development of three-phase DC-AC converter, which is responsible for interfacing with the grid, absorbing or injecting electrical energy, depending on the mode of operation of the storage system. Additionally, one of the main contributions to the system operation is that the DC-AC converter allows operation as a three-phase shunt active filter (APF). Throughout the development of this dissertation, it was possible to validate the topology of the three-phase DC-AC converter with four legs operating in different modes, as well as its control system. These modes involved a theoretical study, which is necessary to perform the simulation tests and experimental validation of the performance of the implemented system.
Este trabalho de mestrado está enquadrado no projeto de IC&DT “Quality4Power - Enhancing the Power Quality for Industry 4.0 in the era of Microgrids”, financiado pela Fundação para a Ciência e Tecnologia, com a referência PTDC/EEI-EEE/28813/2017.
Este trabalho de mestrado está enquadrado no projeto de IC&DT “newERA4GRIDs – New Generation of Unified Power Conditioner with Advanced Control, Integrating Electric Mobility, Renewables, and Active Filtering Capabilities for the Power Grid Improvement”, financiado pela Fundação para a Ciência e Tecnologia, com a referência POCI-01-0145-FEDER-030283.