基于潮流控制器的同相牵引供电系统方案研究

Study on power supply system of cophase traction based on the power flow controller

为解决电气化铁道牵引负荷的不平衡性和非线性,需要进行大容量的综合补偿。介绍了大容量潮流控制器的拓扑结构,给出了综合补偿电流检测和正弦波脉宽调制(SPWM)控制方法。提出了以大容量潮流控制器为中心,结合斯科特变压器构成同相牵引供电系统。该系统不仅能传递有功功率、补偿无功功率及谐波,还可以取消电分相。大容量潮流控制器由四重化的三电平电压源换流器组成,具有拓扑结构简单,提供容量大等优点。最后以交直型机车为例,采用MATLAB软件仿真验证了该系统方案和控制方法的可行性。

Large capacity comprehensive compensation is needed to solve the unbalacedness and nonlinearity of the traction load in the electrified railway .In this paper , the topological structure of large capacity power flow controller is described , the methods of comprehensive compensation current detecing and sinusoidal pulse withth modulation （ SP-WM） controlling are given out , and the cophase traction power supply system combining with Scott transformer with large capacity power flow controller as a center is proposed .The system can not only deliver active power , compensate reactive power and harmonic , but also cancel the electric phase seperation .The large capacity power flow controller consists of quadruple three-level voltage source inverter , has advantages of simple topological structure and large ca-pacity .Making AC-DC locomotive as an example , the MATLAB simulation results show the feasibility of the system .