基于大功率有源滤波器的同相AT牵引供电系统

电气化铁道牵引负荷的非线性和不平衡性，导致牵引负荷功率因数低，注入电力系统的谐波、负序电流和无功功率较大，通信防护效果差，进行综合补偿容量大。介绍了大功率有源滤波器的结构，给出综合补偿电流检测和正弦脉宽调制方法。提出了在自耦变压器（AT）供电方式的基础上。以大功率有源滤波器为中心，结合三相变四相变压器和数字控制模块构成同相AT牵引供电系统，不仅能解决以上问题，而且可以取消“分相绝缘器”和节省自耦变压器。大功率有源滤波器由并联PWM变流器组成，具有拓扑结构简单，易控制、提供容量大、工作可靠等优点。仿真分析表明，该系统具有良好的可行性。

A Co-phase AT Traction Power Supply System Based on High-power Active Filter

Nonlinearity and unbalance of traction load for electric railway leads to the load with low power factor,the power system with high harmonic,high negative sequence current and reactive power injected,and worse communication defense,so it needs comprehensive compensation.It introduces the structure of high power APF,presents its detecting method of comprehensive compensating currents and control method of SPWM.On the foundation of auto-transformer(AT) power supply module,it presents a co-phase AT traction po...