高铁再生制动工况下公用电网负序电流优化

Optimization of Negative Sequence Current in Public Power Grid under Regenerative Braking Condition of High Speed Railway

为解决高速列车再生制动工况下产生的巨大能量造成公用电网负序电流急剧增加的问题,提出采用基于超级电容储能的铁路功率调节器(SC-RPC)补偿装置。通过分析SC-RPC的电气模型,构建再生制动工况下基于SC-RPC的公用电网最小负序电流数学模型,采用改进粒子群算法求解模型,提出相应的控制策略,并进行仿真验证。结果表明:采用SC-RPC,能够有效抑制因再生制动产生的负序电流,并且在大幅降低负序电流的同时使功率因数大于0.9,满足国家标准规定的电能质量要求,验证了再生制动工况下采用SC-PRC抑制公用电网负序电流的有效性。

In order to solve the problem in the rapid increase of negative sequence current in public power grid caused by the huge energy generated under regenerative braking condition of G-series high-speed train,a compensation device for railway power controller based on super capacitor energy storage system(SC-RPC)was proposed.By analyzing the electrical model of SC-RPC,the mathematical model of the minimum negative sequence current in public power grid based on SC-RPC under regenerative braking condition was constructed.The model was solved by using improved particle swarm algorithm.The corresponding control strategy was proposed and was verified by simulation.Results show that the SC-RPC can effectively inhibit the negative sequence current generated by regenerative braking.Moreover,it can significantly reduce the negative sequence current and make the power factor greater than0.9at the same time,which meets the power quality requirements defined by national standards.The effectiveness of using SC-RPC to inhibit the negative sequence current in public power grid under regenerative braking condition is verified.