[关键词]
[摘要]
零阻变换器系统(zero-resistance converter system,ZRCS)能将走行轨电流从虚拟回流地处转移至回流线缆,进而从源头上治理城市轨道交通钢轨电位与杂散电流问题。作为ZRCS中影响虚拟回流地位置的关键部件之一,开关单元的数量与分布将直接影响钢轨电位和杂散电流的分布。实际列车运行过程中,牵引和制动工况下的列车电流及相应钢轨电位远大于匀速工况,通过调整开关单元的分布降低此部分的钢轨电位,可提高ZRCS的综合治理效果。因此本文在分析ZRCS中开关单元作用的基础上,提出其优化分布方法,通过对比不同开关单元分布下的治理效果,得到较优方案。仿真结果表明,所提出的优化方法能进一步提高ZRCS的治理效果,具有可行性。
[Key word]
[Abstract]
Zero-resistance converter system(ZRCS) transfers the rail current from returning point to return cable, then mitigate the rail potential and stray current of urban rail transit from the source. As one of the key devices, switch unit(SU) influence the position of returning equi-point in ZRCS, and the number and distribution of SUs affect the distribution of rail potential and stray current directly. In the actual train operation, the train current under traction and braking conditions are much larger than that under constant speed conditions, resulting in larger rail potential correspondingly. By changing the SUs distribution, rail potential of this part can be reduced and the comprehensive mitigation performance of ZRCS can be improved. Therefore, based on analysis of the role of SU, a method for the SUs distribution optimization is proposed. By comparing the mitigation performance under different SUs distribution, the optimal SUs distribution is obtained. Simulation results indicate that the proposed optimization method can improve the mitigation performance of ZRCS.
[中图分类号]
TM 922;TM 46
[基金项目]
国家自然科学基金项目(面上项目,重点项目,重大项目)