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Controle de tensão e reativos em redes de distribuição de energia elétrica

Quijano Rodezno, Darwin Alexis
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Dissertação de Mestrado Formato: 99 f. : il.
POR
Relevância na Pesquisa
45.88%
Pós-graduação em Engenharia Elétrica - FEIS; A new approach for the integrated Volt-Var control (IVVC) for medium voltage distribution networks operation is proposed here, seeking to explore the problem of energy savings and peak demand relief through the voltage reduction procedure called Conservation Voltage Reduction (CVR). Wide applications of CVR can provide significant benefits on technical, economic and environmental terms. However, in some cases, due to unexpected variation, significant voltage deviations may appear and cause undesirable voltage levels. Therefore, this paper seeks to mitigate the problem of voltage reduction application via multiobjective optimization. The proposal presented here is for the operation phase, taking into account the active power intake reduction and the voltage deviation, with a strategy based on a day ahead load forecast and considering the presence of transformers with On Load Tap Changer (OLTC), automatic voltage regulators, capacitor banks and distributed generation,. Therefore the result is a set of non-dominated optimal solutions (Pareto front), and the decision maker may decide when, where and how to apply them to meet different goals; Uma nova abordagem do controle integrado de tensão e reativos para a operação de redes de distribuição de média tensão é proposta neste trabalho...

Controle integrado de tensão e potência reativa através de aprendizado de máquina; Integrated voltage and reactive power control using machine learning

Adriano Costa Pinto
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 30/04/2015 PT
Relevância na Pesquisa
56.29%
A crescente demanda por energia elétrica, por vezes em ritmo mais acelerado que os investimentos em expansão das redes de distribuição, tem levado as distribuidoras a operarem próximo aos limites aceitáveis, o que torna toda a operação da rede mais complexa. Um dos desafios atuais é estabelecer um efetivo controle de tensão e potência reativa (Volt/var) na rede buscando melhorar o nível de operação e de eficiência energética da rede. Muitas propostas para encontrar a solução do problema partiram de uma abordagem de forma desacoplada: o controle de tensão e o controle de potência reativa foram resolvidos separadamente. Neste trabalho, porém, foram estudados métodos de solução do problema visando à segurança da operação e à otimização global dos recursos da rede de modo integrado, ou seja, considerando a dependência entre tensão e potência reativa. Na literatura, grande parte dos trabalhos reportam soluções baseadas em modelos elétricos da rede de distribuição. Os métodos estudados nessa dissertação são baseados em técnicas de aprendizado de máquina com o objetivo de construir um modelo capaz de utilizar apenas as medições de tensão e corrente provenientes dos medidores instalados ao longo da rede e obter o melhor despacho dos ajustes dos dispositivos de controle...

Volt-VAR multiobjective optimization to peak-load relief and energy efficiency in distribution networks

Padilha-Feltrin, Antonio; Quijano Rodezno, Darwin Alexis; Sanches Mantovani, José Roberto
Fonte: Ieee-inst Electrical Electronics Engineers Inc Publicador: Ieee-inst Electrical Electronics Engineers Inc
Tipo: Artigo de Revista Científica Formato: 618-626
ENG
Relevância na Pesquisa
106.33%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Processo FAPESP: 2012/03572-2; This paper addresses the integrated volt-var control for distribution network operation via multiobjective optimization. This paper seeks to explore the problem of energy savings and peak demand relief through the voltage reduction procedure. Currently, due to the emergence of the distribution smart grids, these procedures are gaining renewed interest and attention. The proposal presented here is for the operation phase, with a strategy based on an hourly load forecast for the next day/week, taking into account the active power intake reduction, and the voltage deviation. Therefore, the result is a set of nondominated optimal solutions, and then one may decide when, where, and how to apply them to meet different goals. The obtained solutions, for two typical distribution networks, describe relevant economic and technical benefits.

Battery Placement on Performance of VAR Controls

Yeh, Hen-Geul; Doan, Son H.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 24/11/2013
Relevância na Pesquisa
46.13%
Battery's role in the development of smart grid is gaining greater attention as an energy storage device that can be integrated with a Photovoltaic (PV) cell in the distribution circuit. As more PVs are connected to the system, real power injection to the distribution can cause fluctuation in the voltage. Due to the rapid fluctuation of the voltage, a more advanced volt-ampere reactive (VAR) power control scheme on a fast time scale is used to minimize the voltage deviation on the distribution. Employing both global and local dynamic VAR control schemes in our previous work, we show the effects of battery placement on the performance of VAR controls in the example of a single branch radial distribution circuit. Simulations verify that having battery placement at the rear in the distribution circuit can provide smaller voltage variations and higher energy savings than front battery placement when used with dynamic VAR control algorithms.; Comment: Proceedings of Green Energy and Systems Conference 2013, November 25, Long Beach, CA, USA

Fuzzy inference system for integrated VVC in isolated power systems

Vega-Fuentes, Eduardo; Cerezo-Sanchez, Juan Manuel; Rosario, Sonia Leon-del; Vega-Martinez, Aurelio
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 10/02/2014
Relevância na Pesquisa
56%
This paper presents a fuzzy inference system for integrated volt/var control (VVC) in distribution substations. The purpose is go forward to automation distribution applying conservation voltage reduction (CVR) in isolated power systems where control capabilities are limited. A fuzzy controller has been designed. Working as an on-line tool, it has been tested under real conditions and it has managed the operation during a whole day in a distribution substation. Within the limits of control capabilities of the system, the controller maintained successfully an acceptable voltage profile, power factor values over 0,98 and it has ostensibly improved the performance given by an optimal power flow based automation system. CVR savings during the test are evaluated and the aim to integrate it in the VVC is presented.; Comment: arXiv admin note: substantial text overlap with arXiv:1401.1632