Using Active Power Filter Based on a New Control Strategy to Compensate Power Quality

In this paper, a three-phase active power filter is presented to improve the power quality of a system which supplies a three-phase non-linear load. For this purpose, a three-phase voltage source inverter bridge with a DC bus capacitor is used as an active power filter. A new control strategy is proposed which is based on two popular strategies: synchronous d-q reference frame method & synchronous current detection method which have their own advantages and disadvantages. The proposed control strategy is based on both of two mentioned strategies in order to obtain a good accuracy as well as settling the current response to steady state value very quickly. A hystersis based carrierless PWM current control over the command currents of the active power filter is used to derive the gating signals. Computer simulation results are provided to verify the effectiveness of the proposed method.