An adaptive source current THD oriented fuzzy logic controller in hybrid power filter

This paper presents an adaptive source current THD oriented fuzzy logic controller for a 3-phase 4-wire center split hybrid power filter. The controller adaptively changes the hysteresis band in order to trace the reference total harmonic distortion - THD of the source current at the desired value, so that the switching frequency and switching losses can be minimized, thus reduces the total costs of the system. The proposed control method is workable in PI and fuzzy logic control and is verified by simulations. Moreover, the comparison between the PI and fuzzy logic control is also studied.