中文摘要：

针对目前串联注入变压器尚无相应的国家标准,进行设计时具有一定的盲目性的问题,在分析其工作原理的基础上,建立注入变压器等效电路并推导传递函数,据此分析注入变压器各个参数对统一电能质量调节器（UPQC）补偿特性的影响。以串联侧提供能量最小为前提提出注入变压器容量、变比、损耗和阻抗压降等参数的选取原则,为UPQC研究人员和变压器制造商提供了参考理论依据。通过变电成本分析和实验验证了该选取原则的可行性与合理性。

英文摘要：

In order to get rid of the blindness in series injection transformer design because of lacking of national standards,t his paper,based on the analysis of the work principle of injection transformer,establishes equivalent circuit and deduces transfer function and analyses the effect of parameters of injection transformer on the compensation characteristic of the unified power quality conditioner（UPQC） . T he selection principle of parameters including injection transformer capacity,r atio,loss and impedance voltage drop based on minimum energy provided by series side is proposed,which provides reference and theoretic basis for UPQC researchers and transformer manufacturer .F inally,product cost analysis and experimental results verify the feasibility and rationality of the principle.