弓网离线电弧对PETT的影响及其抑制措施

Disconnection-arc Influence of Pantograph-catenary on PETT and Suppression Measure

在列车高速运行过程中,由于受电弓和接触网独特的接触供电方式,弓网之间的高速滑动将引起垂向的振动和跳动,产生弓网离线及其离线电弧的产生,这将会对列车牵引变流器稳定运行产生很大影响。电力电子牵引变压器是牵引变流器中牵引变压器的一个发展趋势。文中建立了弓网电弧数学建模,分析了弓网电弧对系统输出电压的影响;提出了一种短时开环控制的方法,能够减少电压恢复时间,可以提高在弓网离线时牵引系统的稳定性;提出了一种减小弓网电弧产生的谐波影响的改进控制策略,可以对系统输入电流谐波起到一定抑制作用。

During high-speed running of the train,due to the unique power supply method of pantograph and catenary,sliding between pantograph and catenary will cause vertical vibration which cause the pantograph-catenary disconnection and arc.This will have influence on power electronic traction converters.Power Electronic Traction Transformer(Power Electronic Traction Transformer,PETT)is a trend of traction transformers in traction converters.In this paper,a mathematical model of pantograph and catenary arc is established,and the influence of pantograph-catenary arc on the output voltage of PETT is analyzed.An open-loop control method in short time is proposed to reduce the time to recover the voltage and improve the stability of the traction system when the pantograph and catenary is disconnected.An improved control strategy to reduce the influence of harmonics caused by the arc of the pantograph is proposed,which can suppress the harmonics of the PETT input current.