Current Compound Control Strategy for Single-Phase Shunt Active Power Filter

In order to improve the accuracy of the harmonic current compensation for the single-phase shunt active power filter, a compound control strategy is proposed with the PI control and repetitive paralleling based on the stationary frame, PI control is used to guarantee the system dynamic performance, the repetitive control is to improve the output current tracking accuracy for the load harmonic current. The theoretical analysis and experimental results verify that the waveform quality is effectively improved by the strategy proposed. THD is reduced to 3.8%, which measures up to the international standards of harmonic compensation.