中文摘要：

为解决牵引变的负序问题并补偿无功功率，采用两组单相模块化多电平换流器MMC背靠背连接构造铁路功率调节器RPC，直接接入牵引网。首先，建立了单相MMC数学模型；然后通过二阶广义积分构造正交虚拟分量，将其转换到旋转坐标系下，设计双闭环控制器，并以V/v牵引变为例，定量分析并补偿有功和无功；最后，在Matlab中搭建了基于MMC—RPC向V／v牵引变提供负序治理及无功补偿的仿真系统。仿真结果证明了MMC运用到RPC的可行性以及控制策略的有效性。

英文摘要：

In order to solve the problem of negative sequence and reactive power compensation of traction, back-toback connection structure of railway static power conditioner （RPC） composed of two single-phase modular multilevel converters （MMC） is designed to access to the traction network directly. First, mathematical model of single-phase MMC is established, a virtual ac component using second order generalized integrator（SOGI） is created. Then, a double closed loops controller in synchronous rotating frame is proposed. Taking V/V traction into example, Quantitative is analyzed and active and reactive power are compensated. Finally, a simulation system based on MMC-RPC provide negative sequence control and reactive power compensation for V/v traction is constructed in Matlab. The results show that the feasibility of MMC applied to RPC and effectiveness of control strategy.