基于有源滤波器的V,v接同相供电系统

针对电气化铁道牵引供电系统三相严重不平衡,存在大量谐波和无功,尤其是相邻供电区段间必需用分相绝缘器分隔问题,将V,v接变压器与有源滤波器和AT供电方式有机结合,构造出新型同相牵引供电系统。系统中V,v接变压器的一个带中抽头的副边绕组接AT牵引网,并通过有源滤波器接另一副边绕组,使各供电区段电压相同,从而可以取消分相绝缘器;以检测到的同相综合补偿电流为参考,控制有源滤波器消除三相不平衡,并滤除谐波和无功。仿真证实该同相供电系统方案正确可行,适宜应用于高速电气化铁道。

V, v Connection Cophase Power Supply System Based on Active Power Filter

Considering the problems existed in the electric traction power supply system of electrified railway,such as,the severe three-phase unbalance,abundant harmonic wave and reactive power,and in particular,neutral section insulator between adjacent power supply sections,a new type of cophase traction power supply system is built by combining V,v connection transformer with active filter and AT power supply.In this system,one secondary line winding with a middle tap of V,v connection transformer is connected with AT traction electric network.The other secondary line winding is connected through active filter.In this way,each power supply section has the same voltage and consequently neutral section insulator can be removed.The measured cophase comprehensive compensation current is regarded as the reference to control active filter,eliminate threephase unbalance,and filtrate harmonic wave and reactive power.Simulation has validated the correctness and the feasibility of this cophase power supply system which is applicable to high-speed electrified railway.