Intelligent controllers for shunt active filter to compensate current harmonics based on SRF and SCR control strategies

Abstract

This paper presents a three-phase three-wire shunt active filter based on intelligent controllers to compensate current harmonics. Shunt active filter is the best solution to eliminate harmonics drawn from nonlinear load especially for low power system, the most inverter used is the two-level voltage source. The control strategies adopted to determine the compensation currents are the synchronous reference frame (SRF) detection method and the synchronous current reference (SCR) detection method. To improve the performance of the conventional control scheme based on hysteresis controller and take advantages of intelligent techniques, fuzzy and ANN current controllers are proposed in this paper. To maintain the dc voltage capacitor constant and compensate the inverter losses a proportional integral voltage controller is used. The numerical simulation is developed and performed using MATLAB-Simulink and SimPowerSystemd Toolbox from complete structure including control and power circuits. The obtained results show the simplicity and the effectiveness of the two proposed intelligent current controllers.