Power Quality Enhancement of a Photovoltaic Based Micro Grid System Using Optimized Fuzzy Controller with SAPF

摘要

This paper explains the mitigation of harmonics in PV based micro grid system integrated with a shunt active power filter (SAPF) and a rectifier load. The PV module is designed with MPPT technology and the SAPF is connected at the point of common coupling. The harmonics are present in various part of voltage and currents due to presence of nonlinear load and intermittent PV power generation. The harmonics in the system may cause severe harm such as component overheating, increase in installation and consumer cost, malfunctioning of equipment's, unusual tripping of circuit breakers, failure of sensors and noisy communication. To rectify all such problems appropriate filters should be designed. Here SAPF is designed to suppress the harmonic effects produced in the PV based system. Here the SAPF is designed with various standard control methods such as PI, fuzzy and Particle Swarm Optimization (PSO-fuzzy). To further upgrade the performance of SAPF, a new optimization technique known as Accelerated Particle Swarm Optimization tuned fuzzy (APSO-fuzzy) is applied to select the proper value of PI gains and fuzzy membership values. THD analysis for all the control techniques are carried out and the corresponding results are estimated. The results denotes that the APSO-fuzzy optimized shunt active filter reduces harmonics more efficiently as compared to other conventional control techniques.