The works done in this paper are shown as follows. ( 1) The switched dynamic model of shut three-phase three wire APF system is established by analyzing the main circuit of APF based on switched system theory. 本文所做的工作包括如下几点:(1)基于切换系统理论通过对APF主电路的分析,建立了并联型三相三线制APF的切换动态模型。