一种基于YNvd变压器的多电平铁路功率调节系统  

Multilevel Railway Power Conditioner System Based on YNvd Transformer

作　　者：罗隆福[1] 周净轩 田野 颜亚菲 LUO Longfu;ZHOU Jingxuan;TIAN Ye;YAN Yafei(School of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学电气与信息工程学院

出　　处：《电源学报》2019年第5期120-128,共9页Journal of Power Supply

基　　金：国家自然科学基金资助项目(51477046)~~

摘　　要：为解决高速铁路牵引供电系统中的负序、谐波电能质量问题,提出了一种基于YNvd平衡变压器的多电平铁路功率调节系统。采用由4个多电平级联型H桥链与滤波电感组成的多电平铁路功率调节器MRPC(multilevel railway power conditioner),并将MRPC一侧直接连接于YNvd平衡变压器二次侧β相分接头,取代了通过降压变压器连接于供电臂的传统方法,减少了系统成本。分析了该系统的拓扑结构、等效模型及补偿原理,并根据补偿原理提出一种由指令电流跟踪、环流抑制与链节电压平衡3层组成的分层控制策略,最后通过仿真验证了所提理论的可行性与有效性。To solve the power quality problems in a high-speed railway tractive power supply system such as negative-sequence current and harmonic current,a multilevel railway power conditioner(MRPC)system based on YNvd bala-nced transformer is proposed,which adopts a novel MRPC consisting of four multilevel cascaded H-bridge links and the corresponding output filter inductors.Different from the conventional method,this system integrates one side of the MRPC directly into theβ-phase flexible taps on the secondary side of the YNvd balanced transformer instead of into the feeder via a step-down transformer,thus reducing the system cost.The topological structure,equivalent model,and compensation principle of this system are analyzed.Furthermore,a hierarchical control strategy,which is composed of command current tracking,circulating current restraining and link voltage balance,is proposed.Finally,simulation results verify the feasibility and effectiveness of the proposed theory.

关 键 词：铁路功率调节器 模块化多电平换流器 平衡变压器 负序电流 谐波 分层控制 

分 类 号：TM71[电气工程—电力系统及自动化]