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Revista Eletrônica de Potência

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Issue: Volume 27 - Number 2
Publishing Date: junho 2022
Editor-in-Chief: Marcelo Lobo Heldwein
Editor Affiliation: Federal University of Santa Catarina
ESTIMATIVA DE IMPEDÂNCIA PARA SUPORTE DE ESTABILIDADE E QUALIDADE DE ENERGIA EM INVERSORES CONECTADOS À REDE
Hugo Matheus Teixeira Cotrim Gomes, Leandro Leysdian Oro Carralero, José Hidalgo Suárez, André Pires Nóbrega Tahim, José Renes Pinheiro, Fabiano Fragoso Costa
165-176
http://dx.doi.org/10.18618/REP.2022.2.0004
Portuguese Data

Palavras Chaves: Amortecimento ativo, Análise de Estabilidade, Controle Adaptativo, Estimação de impedância, Método de Newton-Raphson

Resumo
Este trabalho propõe um método de estimação da impedância de rede adequado a sistemas de geração distribuída conectados à rede por meio de inversores. O procedimento é baseado em variações nas potências ativa e reativa injetadas no sistema de potência pelo inversor. As variações provocam alterações nos valores de tensão e corrente no Ponto de Acoplamento Comum (PAC). Essas alterações são usadas para estimar a resistência e indutância da rede através de análise numérica de Newton-Raphson. Além disso, a estimativa da impedância é usada para adaptar uma técnica de amortecimento ativo do sistema de controle do inversor. O método proposto é verificado por meio de simulações no ambiente PSIM e experimentalmente em tempo real por meio de plataforma de testes Hardware-in-the-Loop (HIL).

English Data

Title: A GRID IMPEDANCE ESTIMATION METHOD TO SUPPORT STABILITY AND POWER QUALITY IN GRID-CONNECTED INVERTERS

Keywords: Active damping, Adaptive Control, Grid impedance estimation, Inverters, Newton-Raphson method, Stability Analysis

Abstract
This work proposes a method to estimate a grid impedance suitable for inverter-based grid-connected distributed power systems. The procedure is based on variations in active and reactive powers injected into the power system by the grid-connected inverter. The variation provokes changes in the voltage and current values at the Point of Common Coupling (PCC). The changes are used to estimate the grid resistance and inductance through a Newton-Raphson numerical analysis. Moreover, the estimated impedance is used to adapt an active damping technique of the inverter's control system. The proposed method is verified by simulations in the PSIM environment and experimentally in real-time through a Hardware-in-the-Loop (HIL) testing platform.

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