摘要
在电力机车牵引变流器优化控制的研究中,动车组牵引变流器是动车组完成电能转换和传递的关键部件,性能好坏直接关系到动车组能否安全可靠运行。针对CRH2A型牵引变流器输出电压变化率大、谐波含量高等问题,对多电平技术在牵引变流器中的应用进行了研究。首先分析了二极管箝位型五电平变流器(DCMLC)和模块化五电平变流器(M2LC)的工作原理及控制策略,分别构建了牵引变流器的优化模型;并根据CRH2A型牵引变流器主电路实际设计参数应用Matlab仿真软件对五电平DCMLC和M2LC分别进行了建模和仿真,比较和分析了牵引变流器中不同逆变器电路拓扑结构及其对应的控制策略对系统输入输出性能的影响。仿真结果初步验证了两种优化模型对CRH2A型牵引变流器性能的改善效果。
A traction converter is a critical component to implement electrical energy conversion and transmission for EMU. Its performance is directly related to the EMU's operation safety and reliability. Considering the large output voltage change rate and the high harmonic content,research on multilevel technology applied to traction converter was conducted. Firstly,the working principle and control strategy of the diode clamped five- level converter( DCMLC) and modular five- level converter( M2LC) were analyzed. The optimization models of traction converter were built based on the above topologies. Based on the actual design parameters of the traction converter's main circuits of CRH2 A,the modeling and simulation of the five- level DCMLC and M2 LC were separately conducted on Matlab platform. Comparison and analysis of the effects on system's input / output performance imposed by different traction inverter circuits' structures and the corresponding control methods were conducted. The simulation results preliminary verify the effect of the improvements of the two optimization models.
引文
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