Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgrid
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFLA |
Texto Completo: | http://repositorio.ufla.br/jspui/handle/1/48082 |
Resumo: | Distributed generation units participating in a microgrid may be employing different primary energy sources such as fossil fuels, renewable resources or battery systems. Given the diversity of such sources, it is natural that the operational costs will probaly vary between such units. When a microgrid is disconnected from the main electrical system, its distributed generators must be able to maintain adequate voltage and frequency levels to meet local loads. In addition, at this condition it is also necessary to coordinate the power dispatch of each generator based on their respective operational costs in order to minimize the overall islanded system operational cost. The microgrid local control in island operation can be accomplished by two methods: utilizing a central control system, which relies on communication technologies to coordinate the operation of local power sources, or by means of a distributed economic power-sharing management system, which performs sequential power dispatch of the distributed generators based on each unity operational cost, without a paralell communication system being required. The coordination of this strategy is based on the variation of grid parameters, such as voltage amplitude and frequency. This control method is known as Droop strategy and has the advantage of avoiding the use of secondary communication channels between converters, increasing system reliability, simplicity and speed response performance. In this context, this study consists of adapting a power sharing strategy based on economic aspects inherent to the primary energy source of the distributed generation units for a single-phase low-voltage microgrid, aiming system overall operational cost reduction. This strategy was implemented using finite-control-set model predictive control as local control method for the power-electronic converters, which added adequate ability to follow reference signals with dynamic adjustment, disturbance rejection and to deal with nonlinearities in the system, with performance comparable to traditional control techniques. The validation of the adapted economic strategy is performed in computer simulations using the MATLAB/Simulink software for a low-voltage microgrid with distinc loads and variable power demand over time. |
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Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgridEstratégia de compartilhamento econômico de potências utilizando controle droop para conversores paralelos em uma microrrede AC de baixa tensãoControle DroopMicrorredes ResistivasMicrorrede de baixa tensãoCompartilhamento de potênciaDroop controlResistive microgridsLow voltage microgridPower sharingTransmissão da Energia Elétrica, Distribuição da Energia ElétricaDistributed generation units participating in a microgrid may be employing different primary energy sources such as fossil fuels, renewable resources or battery systems. Given the diversity of such sources, it is natural that the operational costs will probaly vary between such units. When a microgrid is disconnected from the main electrical system, its distributed generators must be able to maintain adequate voltage and frequency levels to meet local loads. In addition, at this condition it is also necessary to coordinate the power dispatch of each generator based on their respective operational costs in order to minimize the overall islanded system operational cost. The microgrid local control in island operation can be accomplished by two methods: utilizing a central control system, which relies on communication technologies to coordinate the operation of local power sources, or by means of a distributed economic power-sharing management system, which performs sequential power dispatch of the distributed generators based on each unity operational cost, without a paralell communication system being required. The coordination of this strategy is based on the variation of grid parameters, such as voltage amplitude and frequency. This control method is known as Droop strategy and has the advantage of avoiding the use of secondary communication channels between converters, increasing system reliability, simplicity and speed response performance. In this context, this study consists of adapting a power sharing strategy based on economic aspects inherent to the primary energy source of the distributed generation units for a single-phase low-voltage microgrid, aiming system overall operational cost reduction. This strategy was implemented using finite-control-set model predictive control as local control method for the power-electronic converters, which added adequate ability to follow reference signals with dynamic adjustment, disturbance rejection and to deal with nonlinearities in the system, with performance comparable to traditional control techniques. The validation of the adapted economic strategy is performed in computer simulations using the MATLAB/Simulink software for a low-voltage microgrid with distinc loads and variable power demand over time.As unidades de geração participantes de uma microrrede podem fazer o uso de diferentes fontes primárias de energia, tais como combustíveis fósseis, recursos renováveis ou sistemas de bateria. Dada a diversidades de tais fontes, é natural que haja diferenças nos custos de operação das unidades de geração distribuída. Quando uma microrrede encontra-se desconectada do sistema elétrico principal, suas unidades geradoras devem ser capazes de manter níveis adequados de tensão e frequência para atendimento das cargas locais. Além disso, nessa condição também é necessário coordenar o fornecimento de energia de cada gerador com base em seus respectivos custos operacionais, visando minimizar o custo global de operação do sistema ilhado. O controle local de uma microrrede nessa condição pode ser realizado por dois métodos: empregando um sistema de controle central, o qual baseia-se em tecnologias de comunicação para coordenar a operação das fontes de energia, ou então através de um sistema distribuído de gestão econômica dos geradores, o qual realiza o despacho de potência sequencial dessas unidades baseado nos seus respectivos custos de operação, sem a necessidade de um sistema paralelo de comunicação. A coordenação dessa estratégia se dá através da variação de parâmetros da própria rede local, como frequência e amplitude da tensão. Esse método de controle é conhecido como estratégia Droop e apresenta como vantagem a dispensa do uso de meios de comunicação secundários entre os conversores, o que aumenta a confiabilidade, simplicidade e velocidade de atuação do sistema. Nesse contexto, esse trabalho consiste em adaptar uma estratégia de compartilhamento de potência baseada em aspectos econômicos inerentes à fonte energética primária das unidades de geração distribuídas para uma microrrede monofásica ilhada de baixa tensão, visando minimizar custos globais de operação. Essa estratégia foi implementada empregando-se o controle preditivo baseado em modelo com conjunto de dados finito como método de controle local dos conversores eletrônicos, adicionando adequada capacidade de seguir sinais de referência com ajuste dinâmico, de rejeição de distúrbios e de lidar com não-lineariades no sistema, com desempenho comparável a técnicas de controle tradicionais. A validação da estratégia econômica adaptada é realizada em simulações computacionais empregando o software MATLAB/Simulink para uma microrrede de baixa tensão com cargas distintas e com demanda de potência variável ao longo do tempo.Universidade Federal de LavrasPrograma de Pós-Graduação em Engenharia de Sistemas e AutomaçãoUFLAbrasilDepartamento de EngenhariaFerreira, Sílvia CostaFerreira, Sílvia CostaPereira, Rondinelli RodriguesPacheco, Vinicius MirandaSilva, Felipe Oliveira ePedroso, João Paulo de Carvalho2021-09-09T18:39:42Z2021-09-09T18:39:42Z2021-09-092021-07-25info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfPEDROSO, J. P. de C. Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgrid. 2021. 167 p. Dissertação (Mestrado em Engenharia e Sistemas de Automação) – Universidade Federal de Lavras, Lavras, 2021.http://repositorio.ufla.br/jspui/handle/1/48082enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLA2021-09-09T18:39:42Zoai:localhost:1/48082Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2021-09-09T18:39:42Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false |
dc.title.none.fl_str_mv |
Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgrid Estratégia de compartilhamento econômico de potências utilizando controle droop para conversores paralelos em uma microrrede AC de baixa tensão |
title |
Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgrid |
spellingShingle |
Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgrid Pedroso, João Paulo de Carvalho Controle Droop Microrredes Resistivas Microrrede de baixa tensão Compartilhamento de potência Droop control Resistive microgrids Low voltage microgrid Power sharing Transmissão da Energia Elétrica, Distribuição da Energia Elétrica |
title_short |
Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgrid |
title_full |
Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgrid |
title_fullStr |
Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgrid |
title_full_unstemmed |
Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgrid |
title_sort |
Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgrid |
author |
Pedroso, João Paulo de Carvalho |
author_facet |
Pedroso, João Paulo de Carvalho |
author_role |
author |
dc.contributor.none.fl_str_mv |
Ferreira, Sílvia Costa Ferreira, Sílvia Costa Pereira, Rondinelli Rodrigues Pacheco, Vinicius Miranda Silva, Felipe Oliveira e |
dc.contributor.author.fl_str_mv |
Pedroso, João Paulo de Carvalho |
dc.subject.por.fl_str_mv |
Controle Droop Microrredes Resistivas Microrrede de baixa tensão Compartilhamento de potência Droop control Resistive microgrids Low voltage microgrid Power sharing Transmissão da Energia Elétrica, Distribuição da Energia Elétrica |
topic |
Controle Droop Microrredes Resistivas Microrrede de baixa tensão Compartilhamento de potência Droop control Resistive microgrids Low voltage microgrid Power sharing Transmissão da Energia Elétrica, Distribuição da Energia Elétrica |
description |
Distributed generation units participating in a microgrid may be employing different primary energy sources such as fossil fuels, renewable resources or battery systems. Given the diversity of such sources, it is natural that the operational costs will probaly vary between such units. When a microgrid is disconnected from the main electrical system, its distributed generators must be able to maintain adequate voltage and frequency levels to meet local loads. In addition, at this condition it is also necessary to coordinate the power dispatch of each generator based on their respective operational costs in order to minimize the overall islanded system operational cost. The microgrid local control in island operation can be accomplished by two methods: utilizing a central control system, which relies on communication technologies to coordinate the operation of local power sources, or by means of a distributed economic power-sharing management system, which performs sequential power dispatch of the distributed generators based on each unity operational cost, without a paralell communication system being required. The coordination of this strategy is based on the variation of grid parameters, such as voltage amplitude and frequency. This control method is known as Droop strategy and has the advantage of avoiding the use of secondary communication channels between converters, increasing system reliability, simplicity and speed response performance. In this context, this study consists of adapting a power sharing strategy based on economic aspects inherent to the primary energy source of the distributed generation units for a single-phase low-voltage microgrid, aiming system overall operational cost reduction. This strategy was implemented using finite-control-set model predictive control as local control method for the power-electronic converters, which added adequate ability to follow reference signals with dynamic adjustment, disturbance rejection and to deal with nonlinearities in the system, with performance comparable to traditional control techniques. The validation of the adapted economic strategy is performed in computer simulations using the MATLAB/Simulink software for a low-voltage microgrid with distinc loads and variable power demand over time. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-09-09T18:39:42Z 2021-09-09T18:39:42Z 2021-09-09 2021-07-25 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
PEDROSO, J. P. de C. Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgrid. 2021. 167 p. Dissertação (Mestrado em Engenharia e Sistemas de Automação) – Universidade Federal de Lavras, Lavras, 2021. http://repositorio.ufla.br/jspui/handle/1/48082 |
identifier_str_mv |
PEDROSO, J. P. de C. Economic power sharing using droop strategy for parallel converters in a low-voltage AC island microgrid. 2021. 167 p. Dissertação (Mestrado em Engenharia e Sistemas de Automação) – Universidade Federal de Lavras, Lavras, 2021. |
url |
http://repositorio.ufla.br/jspui/handle/1/48082 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Lavras Programa de Pós-Graduação em Engenharia de Sistemas e Automação UFLA brasil Departamento de Engenharia |
publisher.none.fl_str_mv |
Universidade Federal de Lavras Programa de Pós-Graduação em Engenharia de Sistemas e Automação UFLA brasil Departamento de Engenharia |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFLA instname:Universidade Federal de Lavras (UFLA) instacron:UFLA |
instname_str |
Universidade Federal de Lavras (UFLA) |
instacron_str |
UFLA |
institution |
UFLA |
reponame_str |
Repositório Institucional da UFLA |
collection |
Repositório Institucional da UFLA |
repository.name.fl_str_mv |
Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA) |
repository.mail.fl_str_mv |
nivaldo@ufla.br || repositorio.biblioteca@ufla.br |
_version_ |
1807835096331321344 |