The operation of hybrid active filter for harmonic elimination

This paper presents a current harmonic elimination algorithm by using the hybrid active filter. The adopted hybrid active filter consists of one active filter and one passive filter connected in series. By controlling the equivalent output voltage of active filter, the current harmonics generated from the nonlinear load are blocked and flowed into the hybrid active filter. The harmonic current detecting approach and dc link voltage regulation are proposed to obtain equivalent voltage of the active filter. The effectiveness of the proposed topology has been verified by the computer simulation and experimental results in a laboratory prototype.