Enhancement of High-order vector control strategy for LCL Filter Based Grid-Connected PV system by Using Fuzzy Logic Controller

Abstract

This paper presents an approach of high order control strategy for the connection of a photovoltaic generator to the utility grid. A theoretical analysis, modelling, controlling and a simulation of a grid connected photovoltaic system using an output LCL filter are described in detail. The use of LCL filters in pulse width modulation voltage source converters is a standard solution for providing proper attenuation of high-order grid-current harmonics. However, these filters can cause the undesired effect of resonance. The proposed strategy is attractive since it is simple, does not depend on grid parameters and does not increase the number of sensors. The whole system is controlled using Matlab/Simulink environment. The dynamic performance of a Fuzzy logic controller is controlled in the presence of high order controller, which increases the overall efficiency of the system strategy.