Input power factor correction solutions of the voltage source active power filter

The paper presents additional solutions for input power factor correction of Voltage Source Active Power Filter (VSAPF) and method of its stability analysis. Some disadvantages were detected during investigation of this new parallel active compensator. Usage of series inductance in compensator power stage caused the input power factor deterioration. Proposed modifications let solve this problem so that the input power factor is unity. Connection of two parallel current and voltage sources with common DC element gives the ability to improve stability. Results of proposed modification are very good reactive and distortion power compensation.