摘要
针对铁路电力机车负荷对电网带来的电能质量问题,多电平铁路功率调节器(MRPC)能够满足高压大功率应用领域的要求,实现电能质量的改善和调节。然而,MRPC内部存在的桥臂环流将影响MRPC输出特性。本文首先建立了三桥臂MRPC环流模型,分析了MRPC环流、桥臂电流和交流输出电流之间的数学关系,在此基础上对MRPC环流机理和构成进行了分析。为了抑制MRPC环流,提出了基于比例谐振调节器的环流抑制策略,该方法可以降低补偿延时,改善环流抑制效果。最后,通过RT-LAB实时仿真平台,对三桥臂MRPC环流抑制策略进行了仿真验证,结果验证了该方法可以显著抑制桥臂环流,使得MRPC系统稳定运行。
For the problems of power quality generated by railway locomotives, railway static power conditioner （RPC） based on modular multilevel converter（MMC） can meet the demand for high-voltage and high-power areas. However, circulating current of multilevel railway static power conditioner （MRPC） has disadvantages over output characteristics of MRPC. In this paper, firstly circulating current model of three-arm MRPC is established to analyze mathematical relationships of diffident kinds of currents. Then the components and principle of circulating current are obtained. For the purpose of suppressing circulating current, a method based on PR conditioner is proposed. This method can improve the effect and reduce the delay for compensation. Finally, the advantages of this method are concluded and the real-time simulation of RT-LAB is used to prove the feasibility and effectiveness of this method.
出处
《电源学报》
CSCD
2014年第6期79-85,共7页
Journal of Power Supply
基金
国家国际科技合作专项项目(2013DFA60930)
中央高校基本科研基金项目(2010JBZ002)~~
关键词
模块化多电平变流器
铁路功率调节器
环流抑制策略
modular multilevel converter
railway static power conditioner
circulating current suppressing strategy
