牵引网过电流时的有源滤波器暂态过程分析与保护

分析了同相AT牵引供电的有源滤波器（APF）在牵引网发生过电流时的暂态过程并提出了相应的保护方案。 根据同相供电和APF的工作原理，从理论上阐述了APF的输出电流和直流侧电容电压在牵引网短路过流和励磁涌流情况下的暂态变化规律，得出了APF的元件IGBT可能被过电流损毁的结论，由此提出对期望补偿电流最大值进行限幅的方案来保护IGBT。最后利用Matlab软件验证了APF暂态过程分析和保护方案的正确性。

Analysis of the transient process and protection of APF when traction network has over current

This paper studies on the transient process of APF of the cophase AT power supply traction system when the over current of short circuit and inrush current of transformers occur in traction network,and proposes a corresponding protection scheme.According to the work principles of cophase power supply and APF,the changing laws of the APF'outputing current and capacitance'voltage are theoretically studied.The results show that APF'component IGBT is possibly destroyed by the over current.So a protection scheme...