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随着我国电气化高速铁路的发展,牵引供电系统对电网带来的负面影响不容忽视。提出了一种用于电铁牵引变二次侧的新型换流补偿器,通过定义一个虚拟的三相系统并采用分相控制策略,实现动态跟踪并平衡两相牵引桥臂上的负荷,进而从根本上消除牵引变对三相交流系统的负序干扰,并且该补偿器还具备动态无功调节功能。仿真结果证明,本文提出的新型补偿器既可以有效平衡牵引变电所不同桥臂上的负荷,消除电铁牵引变向电网注入的负序电流,还可以通过补偿器实现牵引站的动态无功补偿。
With the development of electrified high-speed railway in our country, the negative impact of traction power supply system on power grid can not be ignored. A new type of commutation compensator is proposed for the secondary side of electric railway traction. By defining a virtual three-phase system and adopting the phase-separation control strategy, the dynamic tracking and balancing load on the two-phase traction bridge arm is achieved. It fundamentally eliminates the negative sequence interference of the traction variable to the three-phase AC system, and the compensator also has the function of dynamic reactive power regulation. The simulation results show that the new compensator proposed in this paper can not only effectively balance the load on the different bridge legs of the traction substation, eliminate the negative-sequence current injected by the electrified railway traction power grid, but also realize the dynamic reactive power of the traction station through the compensator make up.