一种用于电铁牵引变电站负荷平衡的新型补偿器

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。

A Novel Compensator Used in Traction Substation for Load Balancing

With the rapid development of electrified railway,the negative influence of traction power system on power grid is indispensable.A novel compensator used in traction substation is proposed in this paper,and a virtual three-phase control strategy is designed for this compensator to dynamically track and balance the load of traction supply arms by phase-separation control strategy.Then,negative sequence disturbances of three-phase AC system caused by traction system are eliminated,and this compensator can also regulate reactive power of the traction substation.Simulation results show that this novel compensator can not only balance the loads of two traction supply arms,but also realize reactive power compensation efficiently.