提出了一种新型三相统一电能质量控制器(UPQC)的拓扑结构及其相应控制策略。与传统UPQC相比,它特殊的拓扑设计本身就可避免交流短路和直流电容直通故障,因而无需引入变压器等隔离环节,且仍可保证串并联单元之间的能量流动。基于这种拓扑结构,文中又详细阐述其串并联单元相应的控制策略,使之能够实现传统三相UPQC的各项功能。最后给出PSCAD／EMTDC软件的仿真结果,验证了所提出的拓扑和控制策略的有效性。 Proposed a new type of three-phase unified power quality controller (UPQC) topology and the corresponding control strategy. Compared with the traditional UPQC, its special topology design can avoid AC short-circuit and DC capacitor pass-through faults. Therefore, there is no need to introduce isolation such as transformers, and can still ensure the energy flow between the series-parallel units. Based on this topology, the control strategy of the series-parallel unit is elaborated in detail in this paper so as to realize the functions of the traditional three-phase UPQC. Finally, the simulation results of PSCAD / EMTDC software are given, which verify the effectiveness of the proposed topology and control strategy.