地铁牵引供电系统交-直流潮流算法研究

Study on Power Flow Algorithm for Metro Traction Supply System

地铁牵引供电网采用双边供电方式,使得相邻牵引变电所换流器之间相互影响。本文分上、下行线路进行直流功率分配,考虑换流器之间的联系以及再生制动工况,计算各牵引变电所的有功功率输出;考虑换流器特性,将牵引变电所视为PQ节点,进行交流潮流计算;将直流功率分配收敛为最终指标,将交流潮流计算嵌入其中,并用其结果来修正直流潮流的输入量,最终达到收敛的目的。该混合迭代算法收敛性能好,实例验证了该算法的准确性和可靠性。

Metro traction power supply systems adopt the bilateral power supply mode,which results in mutual influence between current converters at each two adjacent traction substations（TSS）.This research took up track and down track as respective units to distribute DC power.Considering the relation among rectifiers and train regenerative braking,the active power outfeed of each TSS was figured out.Considering the characters of rectifiers,the TSS was regarded as a PQ node to calculate AC power flow.DC power flow was calculated until DC power distribution was convergence.Then the AC power flow was embeded into DC power flow and the results from AC/DC iteration were inserted to renew DC power flow until the value was convergence.The speed of the hybrid iteration algorithm is fast.And the analysis of the practical example verifies the accuracy and reliability of this algorithm.