统一电能质量调节器( UPQC) 的建模一般将串联单元与并联单元分开建模，并且将串联变压器理想化，也较少有人分析 UPQC 的串联单元与并联单元之间的相互作用． 文中采用等效的变压器模型建立集串联单元、并联单元于一体的精确数学模型，分析串联变换器与并联变换器的相互作用关系，获得 UPQC 的串联单元、并联单元之间的相互作用机理，进而提出一种基于单位功率因数检测法( UPF) 的 UPQC 协调控制方法． 仿真与实验结果表明，所提方法可使 UPQC 获得较好的补偿效果，从而验证了 UPQC 数学模型和串联并联相互作用机理的正确性．

In the modeling process of a unified power quality conditioner (UPQC),a series unit model and a pa- rallel unit model are separately constructed in general,and an idealized series transformer is applied.In addition,the interaction between the series unit and the parallel unit has been rarely analyzed.In this paper,a precise mathematical model of the UPQC is constructed by using an equivalent transformer model,which integrates the se- ries unit with the parallel unit.Then,the interaction between a series inverter and a parallel inverter is analyzed,and the corresponding interaction mechanism is obtained.Furthermore,a coordinate control method of the UPQC is proposed based on the unity power factor (UPF) detection method.Simulation and experimental results prove that the proposed method can help the UPQC achieve a better compensation effect,thus verifying the correctness of the constructed mathematical model and the obtained interaction mechanism.