【摘要】 将电力系统的三绕组变压器以及T形连线抽象为类三绕组变压器，其中高压侧连接电力系统、中压侧连接不平衡负载、低压侧连接补偿装置，提出了一种该框架下负序补偿装置的容量计算方法。根据绕组之间的连接关系，将三绕组变压器分为YYY、YYD、DDY和DYY共4种类型。为了实现高压侧三相平衡以及单位功率因数的补偿目标，根据类三绕组变压器不同端口之间的复潮流关系、补偿目标条件、负载侧有功与无功功率、补偿侧有功与无功功率得到了YYY/T形连线、YYD结构下低压侧的并联补偿功率方程，并讨论了DDY/DYY结构下串联补偿的可行性。依据所得补偿功率设计了补偿装置的容量选取办法，并进行了理想参数仿真以及MMC-STATCOM模型仿真，验证了所提方法的有效性。更多还原

【Abstract】 The three-winding transformer and T-shaped connection of the power system are abstracted as a three-winding transformer, in which the high-voltage side is connected to the power system, the medium-voltage side is connected to the unbalanced load, and the low-voltage side is connected to the compensation device. A capacity calculation method for the negative sequence compensation devices is proposed under this framework. According to the connection relationship between windings, the three-winding transformer is divided into four types of YYY, YYD, DDY and DYY. In order to achieve the compensation goal of three-phase balance and unit power factor on the high-voltage side, according to the complex power flow relationship between different ports of the three-winding transformer, the compensation target condition, the active and reactive power on the load side, the active and reactive power on the compensation side, the parallel compensation power equation of the low-voltage side under the YYY/T-shaped connection and YYD structure is obtained. The feasibility of series compensation with DDY and DYY transformers is discussed. According to the obtained compensation power, the capacity selection method of the compensation device is designed. Ideal parameter simulation and model simulation with MMC-STATCOM are used to validate the effectiveness of proposed method.更多还原