一种基于有源滤波器的新型同相AT供电系统

本文针对电气化铁道牵引供电系统存在的一些问题，如产生较严重的谐波和无功功率，相邻供电区段必须用分相绝缘器分隔和通信干扰等，提出了一种基于有源滤波器构建的新型同相AT牵引供电系统——单台YN，d11-55接线方式，仅由一台变压器和平衡变换装置构成（中性点接地）。以检测到的同相综合补偿电流为参考，控制有源滤波器以抑制三相不平衡状态，并消除谐波和无功分量。仿真证实这种同相供电系统是可行的。

A Novel Co-phase AT Power Supply System Based on Active Filter

To solve those problems existing in traction power supply system of electric railway such as harmonies, reactive power generated in the system, the adjacent supply sections that must be separated by neutral section insulator, and communication disturbance and so on, the paper proposes a novel co-phase AT traction power supply system, the system equips single transformer with YN and d11-55 connection mode based on active filter which consists of only one transformer and a balance converter with neutral point grounding, by way of which the detected in-phase comprehensive compensation current is used as the reference to control the active filter to restrain disequilibrium state of three phases and eliminate harmonic and reactive current component. The simulation proves that the novel co-phase supply system is feasible.