The Analysis of Hysteresis Current Control Strategy of Shunt APF Based on the Unified Topology

A unified topology of the shunt APF and its mathematic model are proposed in this paper. Based on these works, hysteresis current control strategies in a-b-c coordinates and in coordinates for the three-phase four-wire shunt APF are investigated and compared. Several conclusions are obtained and their validity are proved by simulation results. The analyses in this paper offer a significant theory basis for improving compensation capability of the three-phase four-wire active power filters with the helps of hysteresis current control strategy.