Shunt Active Power Filter Using Average Power and RLS Self-adaptive Algorithms

摘要

Design a Shunt Active Power Filter (SAPF) based on Average Power Algorithm (APA) and Recursive Least Squares (RLS) Self-adaptive Algorithms. Its reference active current is a balanced three-phase current which has the same phase with voltage of power system source. Two components is included in the reference active current. One is the instantaneous active current that should be sent from power system to loads based on APA. The other part, calculated mainly by a filter based on RLS Algorithm, is the instantaneous active current that should be sent to SAPF to maintain the DC-link voltage invariable. Combine these two parts to get the final instantaneous reference active current value. Controlled by the PWM pulse which get by comparing between the reference compensating current and real generating current through current hysteresis regulator, the inverter compensates the reactive power and restrain the harmonics to make there is only fundamental active current in the power system. The results of simulation comparing between RLS and PI control demonstrate the availability, well performance and real-time characteristics of this SAPF.