用于电磁干扰仿真的牵引电机高频阻抗模型

High-frequency Impedance Model of Traction Motor for Electromagnetic Interference Simulation

列车牵引系统为变压变频逆变器控制的交流传动系统,是高速列车运行过程中传导电磁干扰的主要产生源。为保证列车可靠运行,有必要对系统传导电磁干扰进行仿真预测及分析。牵引电机作为系统的必要组成部分,其高频阻抗模型的准确建立对列车牵引系统电磁干扰仿真平台的搭建起着重要作用。这里通过分析牵引电机内部结构,对已有的电机单相绕组模型进行改进,提出了一种用于传导干扰仿真的牵引电机高频阻抗模型电路拓扑。通过阻抗分析仪测量电机离线状态下20 Hz~30 MHz范围内的共差模阻抗幅值信息,基于测试所得结果,利用遗传算法对阻抗模型中各参数进行提取,得到最终感应电机高频阻抗模型。所建立模型的共差模阻抗特性与实际阻抗测量曲线吻合,验证了此模型的准确性和有效性。

The train traction system is an AC drive system controlled by a variable voltage variable frequency inverter.It is the main source of conducted electromagnetic interference during the operation of high-speed trains.To ensure reliable train operation,it is necessary to simulate,predict and analyze system conducted electromagnetic interference.The traction motor is a necessary part of the traction system,and the accurate establishment of its high-frequency impedance model plays an important role in the establishment of the electromagnetic interference simulation platform of the train traction system.The internal structure of the traction motor is analyzed,improves the existing single-phase winding model of the motor,and proposes a traction motor high-frequency impedance model circuit topology for conducting interference simulation.The common-mode and differential-mode impedance amplitude information in the range of 20 Hz~30 MHz in the offline state of the motor is measured by an impedance analyzer.Based on the test results,the genetic algorithm is used to extract the parameters of the impedance model to obtain the final induction high-frequency equivalent model of motor.The common-mode and differential-mode impedance characteristic of the established model is consistent with the actual impedance measurement curve,which verifies the accuracy and validity of model.