Revisão de Técnicas de Controle Moderno e Aplicação em um Sistema de Geração Distribuída com Filtro LCL de Conexão à Rede de Distribuição de Energia Elétrica.

Abstract

This work has its focus on the project of linear and nonlinear controllers applied to the grid-side current control of an LCL filter, in a two-stage converter used to convert the energy supplied from photovoltaic (PV) modules and injecting these in the AC distribution grid. Derived from linear theories there are the PI + Resonant and the linear quadratic regulator (LQR), and from nonlinear theories, the sliding-mode controller (SMC) and the passivity based controller (PBC). As an alternative to the conventional project methods and as a challenge to unificate the parameters calculations of the controllers, it is used a genetic algorithm (GA) for this objective. The results are obtained via simulations in MatLab/Simulink framework, where it is demonstrated the dynamical characteristics and the total harmonic distortion (THD) of the output current for each of the adopted controllers. In these simulations it is noted a high tracking capacity, considering the speed and the error between reference and output signals, by the use of nonlinear controllers, with the PBC presenting better results as the THD of the output current is considered.