新型同相牵引供电系统方案

针对电气化铁道牵引供电系统存在大量的负序、谐波、无功,以及相邻供电区段分相绝缘器引起的列车速度和牵引力损失等问题,将YN,vd平衡变压器和综合潮流控制器(IPFC)有机结合,构成新型同相牵引供电系统。该系统基本消除了三相不平衡,并使谐波含量尽可能好,从根本上解决了铁道部门与电力部门的主要矛盾。取消电分相环节,顺应了客运高速化、货运重载化的时代趋势。讨论了同相供电系统的结构、平衡变压器的性能,并分析了IPFC的结构、平衡变换原理以及控制策略。仿真结果验证了该方案的可行性。

A New Cophase Traction Power Supply System

Given the problems in the electric traction power supply system of electrified railway, such as large amount of negative sequence, harmonics and reactive power, and the losses of traction speed and power caused by the neutral section insulator between adjacent power supply areas, a new cophase traction power supply system is proposed by combining a YN,vd connected transformer with an integrated power flow controller (IPFC). The system fundamentally overcomes the three-phase unbalance issue with minimum harmonic components. The removal of the neutral section insulator meets the demand of high-speed passenger and heavy cargo services. The structure of cophase traction power supply system and the performance of the YN,vd balance transformer are discussed, and the structure of IPFC, the principle of balanced transformation and the control strategy are analyzed. Simulation results validate the feasibility of the proposed scheme.