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阐述了用一有源滤波器与铁道供电系统相接，以注入牵引负载所需的谐波、无功和负序电流．因此供电电源只提供负载的有功电流．有源滤波器采用电压源ＰＷＭ型变流器．
The harmonic, reactive, and negative sequence currents required for traction loads are described with an active filter connected to the railroad power supply system. Therefore, the power supply only provides the active current of the load. Active filter voltage source PWM converter.