牵引供电系统负序电流和谐波对电力系统的影响及其补偿措施

作为电力系统的一个特殊用户，电气化铁路具有非线性、不对称和波动性的特点。文章以包神铁路巴瓷段瓷窑湾牵引变供电工程为例，分析了电气化铁路负序电流和谐波对电力系统的影响。针对目前补偿措施存在的问题，提出采用由单调谐滤波器和晶闸管控制电抗器构成的静止无功补偿器动态补偿电气化铁路系统不断变化的无功需求，并对瓷窑湾牵引变电站加装静止无功补偿装置前后的负序电流分量和高次谐波抑制情况进行了分析，结果表明，采用上述补偿措施可获得良好的补偿效果。

Impacts of Negative Sequence Current and Harmonics in Traction Power Supply System for Electrified Railway on Power System and Compensation Measures

As a special consumer of power grid, electrified railway possesses the features of non-linearity, asymmetry and fluctuation. Taking Ciyaowan traction power supply system of electrified railway which is Baci part of Baoshen railway for example, the impacts of negative sequence current and harmonics generated in electrified railway on power grid are analyzed. In view of the existing problems in currently used compensation measures, it is proposed to compensate the ever changing requirement of reactive power in electrified railway by static var compensator(SVC) consisting of single tuning filter and thyristor controlled reactor(TCR). The suppression of negative sequence current component and high-order harmonics before and after the installation of above-mentioned SVC in a certain traction substation in China is analyzed, and the results show that a good compensation effect is obtained by use of above-mentioned SVC.