Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Conversor Fonte de Tensão Trifásico, Filtro LCL, Modelagem Matemática

Resumo

Este artigo apresenta, como principal contribuição, a proposta de modelagem matemática da entrada CC do conversor fonte de tensão trifásico (CFT) com filtro LCL, conectado à rede elétrica. Considera-se na modelagem a dinâmica do LCL e do controle de corrente injetada na rede elétrica. Para o controle de corrente do conversor, utilizou-se o controlador proporcional ressonante (P-ressonante) com compensação de harmônicas e o amortecimento do LCL, é realizado através do filtro notch. Com a modelagem proposta, obtém-se um modelo não linear, que é linearizado para obter um modelo que representa com precisão a dinâmica do lado CC do CFT, em torno do ponto de operação em análise, considerando o modo de operação do CFT (retificador ou inversor). Resultados experimentais comparados com os de simulação são apresentados, comprovando a validade dos modelos matemáticos obtidos.

Title: Accurate Modeling For Analysis And Control Design Of The Dc-side Of The Grid-tie Vsc With Lcl Filter

Keywords: LCL filter, Mathematical Modeling, voltage source converter

Abstract

This paper presents a mathematical modeling of the DC input of the grid-tie three-phase voltage source converter (VSC) with LCL filter. It is considered in modeling the dynamics of LCL filter and the current control injected into the grid. For the converter current control, the resonant proportional controller is used with harmonics compensation and the damping of LCL filter is realized through the notch filter. With the proposed modeling, one obtains a non-linear model which is linearized to obtain a model that represents the dynamics of the DC side of VSC, around the analyzed operating point considering the operation mode of the VSC (rectifier or inverter). Experimental results compared with simulation are presented, proving the validity of the proposed study.

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