Direct power control concept and analysis for three phase shunt active power filter

This paper deals with the concept and analysis of direct power control (DPC) for a three phase shunt active power filter (SAPF). From the topology of the SAPF and its equivalent scheme a new predefined switching table is designed by analyzing the voltage source inverter (VSI) switching vectors effect on the total derivatives of instantaneous and reactive power. To maintain the VSI dc-bus voltage at the required level an IP controller is used to obtain the active power control. The active and reactive powers are directly controlled by selecting the optimal switching state. The main advantages of this method are that it provides a sinusoidal source current and unity power factor with no need of linear current controllers and coordinates transformations or modulators. Extensive simulation and experimental results obtained from steady and transient states have proven the excellent performance and verify the validity and effectiveness of the proposed power control scheme.