Power quality improvement using VF-DPC-SVM controlled three-phase shunt active filter

The main focus of this paper is to present a novel and simple direct power control of shunt active power filter with constant switching frequency using space-vector modulation (DPC-SVM). Also, the AC line voltage sensors with a virtual flux (VF) estimator are replaced. This control method is applied to eliminate harmonic pollution and compensate the reactive power in the presence of nonlinear loads and unbalanced sources. The control system is resistant to the majority of line voltage disturbances using by the idea of virtual flux and phase locked loop (PLL) approach. The superior advantages of this method are simple algorithm, good dynamic response, constant switching frequency and resistant to the majority of line voltage disturbances. The simulation results, using Matlab/Simulink, are presented to show the validity of the proposed model, and to evaluate the performance of the control strategy.