CONTROL STRATEGY OF ACTIVE FILTER USING COORDINATION BETWEEN PROPORTIONAL–INTEGRAL MULTI-RESONANT-TYPE REPETITIVE CONTROL AND COMPOSITE OBSERVER

Abstract

This paper presents a control strategy to enhance the operation of an active filter (AF). First, the high-order harmonic components of the current are accurately extracted using a composite observer. Then, a proportional-integral multi-resonant-type repetitive control (PIMR-RC) is applied to control the current harmonics generated by the active filter to follow the current harmonics caused by the nonlinear loads. Simulation using PSIM software for the active filter was performed to verify the feasibility of the proposed control strategy.