Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Afundamento Momentâneo de Tensão, Geração distribuída, Potência Reativa, Regulador Automático de Tensão, Sistema Fotovoltaico Conectado à Rede, Variação de Tensão de Curta Duração

Resumo
O principal objetivo desta pesquisa é propor um controle para injeção de potências ativa e reativa durante o afundamento de tensão a fim de mitigar tal evento. A estratégia empregada no controle proposto funciona em conjunto com o Regulador Automático de Tensão (AVR) em uma versão modificada, no qual atuará sobre as potências ativa e reativa injetada pelo inversor para reduzir os efeitos do afundamento de tensão. Desta forma, o controle evitará possíveis desligamentos e danos aos equipamentos conectados na rede cuja melhoria é percebida nas tensões para os consumidores conectados a ela. Os parâmetros e modificações do AVR serão alterados para uma dinâmica mais rápida, identificando assim as Variações de Tensão de Curta Duração (VTCD) e consequentemente, o controle atuará modificando as potências, ou seja, diminuindo a injeção de potência ativa e aumentando a potência reativa com base na capacidade total do inversor durante o afundamento momentâneo de tensão. Ao final, quando a falha cessar, o inversor injetará somente potência ativa. Para atingir os objetivos, foi implantado um Sistema Fotovoltaico Conectado à Rede elétrica trifásica de 75 kW, no Matlab/Simulink®, onde é avaliado em uma rede de distribuição real na cidade de Palmas, estado de Tocantins/Brasil.

Title: GRID-CONNECTED PHOTOVOLTAIC SYSTEM USING AUTOMATIC VOLTAGE REGULATOR WITH MODIFIED CONTROL DESIGNED TO MITIGATE MOMENTARY VOLTAGE DIPS

Keywords: Automatic Voltage Regulator, Distributed Generation, Grid-Connected Photovoltaic System, Momentary Voltage Dip, Reactive Power, Short-Duration Voltage Variation

Abstract
The main objective of this research is to propose an active and reactive power injection control during voltage sag, in order to mitigate such an event. The strategy employed in the proposed control works in conjunction with the Automatic Voltage Regulator (AVR) in a modified version, where it will act on the active and reactive power injected by the inverter to reduce the effects of voltage sags. In this way, the control will avoid possible shutdowns and damage to equipment connected on grid, whose improvement is perceived in the voltages for consumers connected to it. The AVR parameters and modifications will be changed to a faster dynamic, thus identifying the Short-Duration Voltage Variations (SDVV) and consequently, the control will act modifying the powers, that is, decreasing the active power injection and increasing the reactive power based on the full inverter capacity during the Momentary Voltage Dip (MVD). At the end, when the fault clears, the inverter will only inject active power. To achieve the objectives, a 75 kW three-phase Grid-Connected Photovoltaic System (GCPVS) was deployed in Matlab/Simulink®, where it is evaluated in a real distribution grid in the city of Palmas, state of Tocantins/Brazil.

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