基于有源滤波器和AT供电方式的新型同相牵引供电系统

2台YN,d接线变压器十字交叉构成的AT牵引供电系统,接线复杂,变压器容量利用率低,相邻供电区段必需用分相绝缘器分断,不利于高速铁路运行。由1台YN,d接线变压器加四桥臂有源滤波器构成的新型同相AT牵引供电系统,可以实现同相供电,取消分相绝缘器;可以节省变压器,原边中性点可方便接地;在有源滤波器的作用下,可以实现消除三相不平衡、动态滤除谐波和补偿无功,使变压器容量得到充分利用;由于采用了AT供电方式,因此可以获得综合经济性能优越的通信防护效果。仿真实验也证实了这一点。

A Novel Cophase Power Supply System Based on Active Power Filter and AT Power Supply Mode

There are defects existed in traction power supply system based on transformer decussating two YN,d connection such as complicated connections,low availability of transformer capacity,and neutral section insulator needed in every supply sector which are not suitable for high speed railway.A novel cophase AT traction power supply system based on YN,d connection and four-leg active filter can realize cophase power supply and remove neutral section insulator.It saves transformers,and has neutral ground connection in primary windings.With active filter,three phases are balanced,harmonic wave and reactive current are dynamically filtered,so transformer capacity is effectively used.Due to the adoption of AT power supply mode,its general economic technology indicator is superior in communication defense,which has been verified by simulation tests.