Design of passive high pass filter for shunt active power filter application

Modern active power filters are capable to compensate high order harmonics (typically, the 25^th) dynamically. Even though, shunt active power filter maintains source current nearly sinusoidal, considerable distortion is observed in source current due the presence of high order harmonics (greater than 25^th). A passive high pass filter is used to filter out these harmonics. The design procedure of these high pass filters involves equations of more than second order; hence the parameters are selected by trial and error. In this paper, a simplified design procedure is proposed for designing a high pass filter used for shunt active power filter applications. Equations are derived from the basics and design procedure is demonstrated by considering a case study of a single phase shunt active power filter.