A joint active filter and passive filter strategy for current harmonic cancellation and power factor enhancement in three-phase power networks

Abstract

This paper presents the construction and a new control method of a hybrid parallel harmonics filter (HPHF) which is used for harmonics cancellation and reactive power compensation in three-phase electrical systems. The HPHF hardware is comprised of two primary components: harmonics tuned passive filters and active power electronics filter. HPHF control algorithm makes use of Fourier analysis to facilitate accurate selective harmonics targeting allowing cooperation between passive and active components. MATLAB/Simulink is used to theoretically design and confirm HPHF operation as well as its core functionality. The obtained results show that the active component current rating in the HPHF system is only 30% of the pure active power filter rating with the same harmonics filtering performance. This reduction in rating implies a great economic advantage of the proposed HPHF compared to the traditional APF.