基于牵引系统的电快速脉冲群分析与研究

Analysis of the EFT Mechanism Based on the Traction System

针对城轨列车牵引系统在电快速脉冲群(EFT)抗扰度试验中出现的电压脉冲异常问题,由EFT信号的频谱特性出发,分析了EFT干扰的特点及传导的方式及路径,提出了改善和优化设计的方案,解决了牵引系统EFT抗扰度的问题。首先,针对EFT信号辐射传导的特点,使用双绞屏蔽信号线来消除从外部辐射进入旋变信号线的EFT干扰;其次,通过分析旋变速度信号的频谱特点,设计了低通有源滤波电路;最后,结合滤波器通带宽度,增加扼流线圈消除高频共模干扰。通过试验验证牵引系统在EFT干扰下能够正常稳定运行,对牵引系统的抗电磁干扰设计具有指导意义。

In the view of the problem of pulse anomaly encountered in the electrical fast transient (EFT) immunity test of urban rail train converter.The characteristics of EFT jamming and the path of its conduction are analyzed, an improving and optimizing design scheme is proposed.Firstly, according to the characteristics of radiation conduction of EFT signals, twisted-shielded signal lines are used to eliminate the EFT interference from external radiation into the resolving signal lines. Secondly, a low-pass active filter circuit is designed by analyzing the spectrum characteristics of the resolving speed signals. Finally, in combination with the passband width of the filter, a choke coil is added to eliminate h电h frequency common mode interference.The test verifies that the system can operate normally and stably under EFT interference energy.