城市轨道交通贯通供电方式牵引网分段供电方案及故障辨识方法

Segmental Power Supply Scheme and Fault Identification Method for Urban Rail Transit Traction Network in Continuous Co-phase Power Supply Mode

[目的]城市轨道交通线路采用贯通供电方式时,因牵引网结构复杂且无备用,牵引网发生故障时可能会扩大停电范围,为此需要对牵引网的分段供电方案进行优化。[方法]提出了一种适用于贯通供电方式的牵引网分段供电方案。基于牵引网分段供电拓扑特征,结合车-网耦合特性,提出了分段故障、过渡段故障的辨识方法。对牵引网分段短路和过渡区短路2个故障场景的控制方案进行了分析,描述了这2个故障场景下牵引网的自愈流程,并制定了这2个故障场景对应的断路器控制方案。以广州地铁18号线牵引供电系统为例,通过MATLAB/Simulink软件仿真,验证了所提分段供电方案及故障辨识方法的正确性和可靠性。[结果及结论]该方法可有效辨识故障区段。牵引网故障断路器控制方案可为分段和过渡区提供可靠的主保护,可保证广州地铁18号线牵引供电系统稳定、高效运行。

[Objective]When urban rail transit line adopts the continuous co-phase power supply mode,a fault in the traction network may cause extended power outage due to the complexity and non-backup structure of the traction network.Therefore,it is necessary to optimize the segmental power supply scheme for the traction network.[Method]A segmental power supply scheme for the traction network applicable to the continuous co-phase power supply mode is proposed.Based on the topological characteristics of the segmental power supply of traction network,and combined with the coupling characteristics of vehicle-traction network,the identification methods of segmental short-circuit and neutral section short-circuit are proposed.The control schemes for these two fault scenarios are analyzed,and the self-healing process of the traction network under the above two fault scenarios is described,corresponding circuit breaker control schemes are formulated.In the case study of Guangzhou Metro Line 18,the correctness and reliability of the proposed segmental power supply scheme and the fault identification methods are verified by MATLAB/Simulink software simulation.[Result&Conclusion]The proposed method can effectively identify faulty segments.The circuit breaker control scheme for the traction network fault can provide reliable main protection for the segments and neutral sections,ensuring stable and efficient operation of the traction power supply system of Guangzhou Metro Line 18.