A Robust Control Algorithm for the Hybrid Power Filter Operating Under Real Grid Conditions
摘要
In this paper, a control algorithm of three phase four-wired transformerless hybrid power filter (HPF) based on extended Kalman filter (EKF) with hysteresis current control is proposed to improve the performance of the HPF under real grid condition. The proposed control algorithm is designed to provide current harmonics mitigation and dc bus voltage regulation under distorted and unbalanced supply conditions. Compensating performance of a HPF controlled with traditional instantaneous reactive power control algorithm and control algorithm based a proposed Kalman filter approach with hysteresis current control is analyzed under distorted and unbalanced supply conditions using MATLAB-Simulink. The performance of the traditional control algorithm was found unsatisfactory under distorted and unbalanced supply conditions. Finally simulation results show superior performance in terms of high level of robustness and current harmonics mitigation of HPF’s efficiency under steady state conditions against grid supply imperfections for the EKF based control algorithm with hysteresis current control.