A unified topology of the three-phase four-wire 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 驴-脽-0 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.
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