基于阻波高通滤波器的高速铁路谐振抑制方案

Resonance suppression based on wave-trap high-pass filter for high-speed railway

高速铁路系统中交直交机车产生的高次谐波可能会引发牵引网谐振和谐波电流放大,严重影响高速机车的安全稳定运行。分析了牵引网谐振的引发机制,针对高速铁路系统提出一种可滤除高次谐波和抑制谐振的新型阻波高通滤波器。该阻波高通滤波器由电容器和电抗器并联后,再与电阻串联构成。在工频下,该阻波高通滤波器为开路状态,阻止工频电流流过;在高频下,该阻波高通滤波器呈现低阻抗,具有高通性。试验结果表明,所提高通滤波器在工频下具有极高阻抗;在高频下呈现低阻抗,可滤除高次谐波,抑制牵引网谐振。

The high-frequency harmonic currents generated by the AC-DC-AC locomotives of high-speed railway system may induce the traction network resonance and harmonic current enlargement,seriously affecting its safe and reliable operation. The resonance occurrence mechanism is analyzed and a kind of wave-trap HPF（High-Pass Filter） is proposed to filter the high-frequency harmonic currents and suppress the resonance for high-speed railway system. It consists of a capacitor,a reactor and a resistor,in which,the capacitor and the reactor are connected to each other in parallel,and then to the resistor in series. It functions as an open circuit to hold back the power-frequency current while as a low impedance to allow the high-frequency current to easily pass. The simulative and experimental results show that,the proposed wavetrap functions as a high impedance,while with low impedance at high-frequency,it can filter the highfrequency harmonic currents and suppress traction network resonance.