Control systems analysis of industrial plants with synchronous generators during islanded operation

Trindade, Fernanda C. L.; Meira, Paulo C. M.; Freitas, Walmir; Vieira, José Carlos M.

doi:10.1109/pes.2010.5589547

Cited by 20 publications

(21 citation statements)

References 5 publications

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“…The proposed study considers a 5 MVA synchronous generator driven by a steam turbine connected to the islanded system. The steam turbine is modeled as a single-stage turbine without reheating [14].…”

Section: Dgus Based On Steam Turbinesmentioning

confidence: 99%

Control strategy for frequency regulation in islanded distribution systems with synchronous distributed generators

Vogt¹,

Oliveira

Dranka

2014

2014 IEEE PES General Meeting | Conference &Amp; Exposition

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The occurrence of islanding of distribution systems is an operational event ever more present in power systems due to the insertion and expansion of distributed generation. In this context, this paper proposes a local load shedding relay to enable the islanded operation of distribution systems with distributed synchronous generators. A supplementary control loop added to a battery energy storage system is also proposed in order to contribute to the frequency regulation in the islanded system. The supplementary control provides frequency regulation support during the transition from grid-connected operation to islanded operation, as well as during normal operation of the islanded system.

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Section: Dgus Based On Steam Turbinesmentioning

confidence: 99%

Control strategy for frequency regulation in islanded distribution systems with synchronous distributed generators

Vogt¹,

Oliveira

Dranka

2014

2014 IEEE PES General Meeting | Conference &Amp; Exposition

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“…The prime mover of the DGs is steam turbine whose similar employment could be found in . For more information on small steam turbines, refer to .…”

Section: Studied System: Scheme Description and Control System Modelsmentioning

confidence: 99%

“…Economical benefits for distributed generation (DG) owners and higher supply reliability for reduction of outage intervals have attracted industrial plants to install local generators, which are mostly synchronous machines . For the fact that successful islanded (stand‐alone) operation of DG units helps in maintaining power quality and reliability and enhances system security, stand‐alone operation has become an important topic in the research.…”

Section: Introductionmentioning

confidence: 99%

“…When working in parallel (grid‐connected), the DG control should not respond to changes in utility's frequency and voltage magnitude deviations; otherwise, instability and equipment damage may threaten the DG unit . However, in stand‐alone mode (grid‐disconnected), the DG unit should maintain frequency and voltage of the microgrid due to absence of utility support, thus emerging the need for a change in control mode of the DG.…”

Section: Introductionmentioning

confidence: 99%

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Grid reconnection detection for synchronous distributed generators in stand-alone operation

Jouybari-Moghaddam

Hosseinian

Vahidi

2013

Int. Trans. Electr. Energ. Syst.

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Summary Industrial plants/commercial facilities with synchronous generation, seek reliable and continuous operation even at the time of grid outages. Thus, islanding detection methods have been proposed in the literature that can be used to change the operating mode of the employed distributed generators from grid‐parallel to stand‐alone. Among the few solutions previously presented for switching the control mode in the reverse event of reconnecting to the grid, the method presented in this paper is unique. This grid‐reconnection detection technique is low cost, fast, and does not interact with the power quality of the island although it only uses one, locally measured, variable. The method implies processing of oscillatory modes in frequency signal and is independent of the autonomous island's boundary. The investigation also includes a discussion on similar event of merging of adjacent islands. Simulations confirm the successful discrimination between reconnection event and other switching/power quality events. Copyright © 2013 John Wiley & Sons, Ltd.

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“…Como visto, tais problemas reforçam a necessidade de desconectar todos os geradores distribuídos logo após a ocorrência do ilhamento, mas é importante citar que atualmente existem estudos e normas técnicas que ressaltam a importância da operação isolada de geradores distribuídos após a ocorrência do ilhamento como fator de aumento da confiabilidade do suprimento da energia aos consumidores da concessionária (Xu et al, 2004;Trindade et al, 2010;Salles, 2013;IEEE Std. 1547.4, 2011IEEE Std.…”

Section: Publicaçõesunclassified

Análise da influência de diferentes tipos de cargas no desempenho da proteção anti-ilhamento de geradores distribuídos

Carvalho¹

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A conexão de geradores distribuídos nas redes de subtransmissão e de distribuição de energia elétrica se mostra cada vez mais crescente devido aos inúmeros benefícios técnicos e econômicos alcançados com essa tecnologia. No entanto, há importantes implicações técnicas que precisam ser analisadas antes que um gerador distribuído seja conectado em paralelo ao sistema elétrico. Um aspecto a ser analisado, e que é comum entre as concessionárias de energia elétrica é a adequação da proteção anti-ilhamento, a qual tem a função de detectar essa condição e, automaticamente, desconectar os geradores distribuídos, dentro de um tempo pré-determinado, e assim mantê-los até que o fornecimento de energia seja restabelecido.Neste contexto, este trabalho analisará o desempenho dos relés de proteção anti-ilhamento em face de diferentes tipos de cargas que acabam afetando o tempo de detecção do ilhamento.Com isso, pretende-se obter subsídios para que os ajustes desses relés sejam calculados de forma eficiente. Os relés estudados são o relé de sub/sobrefrequência e o relé de taxa de variação da frequência, e o gerador distribuído é do tipo síncrono equipado com controle de tensão. As análises mostraram que no instante em que ocorre um ilhamento os fatores que mais influenciam no desempenho dos relés de proteção anti-ilhamento são as condições de carga e geração, tempo de detecção estabelecido, tipo do relé adotado, ajuste do mesmo e modelo de carga utilizado.Palavras-chave: geração distribuída, detecção de ilhamento, cargas estáticas, cargas dinâmicas, máquinas síncronas. The connection of distributed generators to power subtransmission and distribution networks has been increasing recently due to the technical and economic benefits that such technology can provide. However, there are important technical issues that need to be carefully analyzed before a distributed generator is connected to electrical systems. One issue to be analyzed, which is common sense among utility companies, is the anti-islanding protection, whose main goal is to detect unintentional islanding and, automatically, disconnect the distributed generators within a required time-interval. In this context, this work will analyze the performance of anti-islanding protection relays in face of different load types.With this study, one intend to get support for adjusting these relays efficiently. The relays studied in this work are the under/over frequency and the rate of change of frequency relays, and the distributed generator is a synchronous machine equipped with an automatic voltage regulator. The analyzes showed that the moment a islanding occurs the most important factors influencing the performance of relays anti-islanding protection are the conditions of load and generation, detection time set, type and relay setting adopted and load model.

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Control systems analysis of industrial plants with synchronous generators during islanded operation

Cited by 20 publications

References 5 publications

Control strategy for frequency regulation in islanded distribution systems with synchronous distributed generators

Control strategy for frequency regulation in islanded distribution systems with synchronous distributed generators

Grid reconnection detection for synchronous distributed generators in stand-alone operation

Análise da influência de diferentes tipos de cargas no desempenho da proteção anti-ilhamento de geradores distribuídos

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