基于网络化资源共享的地铁供电系统可靠性研究

Research on reliability of metro power supply system based on network resource sharing

地铁是城市公共交通重要组成部分之一,地铁安全的重要性不言而喻。目前,北京地铁线网各条线路均采用10 kV分散式供电与双环网式接线方式,但北京地铁存在个别10 kV外部电源迟迟不能投入的情况,导致单条线路10 kV开闭所之间相互支援能力不足,一旦线路出现故障,就可能会带来严重的经济和社会影响。因此,以6号线与2号线的分散式供电系统为研究实例,在不降低行车对数的情况下,从线网间支援供电角度出发,建立中压环网线网支援供电系统,基于中压环网系统的变压器容量选择、电压约束、电流约束和运行方式四个方面,以母线压降和进线电流为指标,评估不同运行工况下的地铁网络化支援供电系统的可靠性,实现供电系统网络化运行和资源共享。

Subway is one of the important parts of urban public transportation,and the importance of subway safety is self-evident.At present,all lines of the Beijing subway network use 10kV distributed power supply and double-loop network connection,but there are individual 10 kV external power supplies in Beijing subway can not be put into the situation,resulting in a single line 10 kV switch between the mutual support ability is insufficient,once the line failure,it may bring serious economic and social impact.Therefore,this paper takes the distributed power supply system of line 6 and Line 2 as an example to establish a medium voltage ring network support power supply system from the perspective of inter-network support power supply without reducing the number of traffic.Based on the transformer capacity selection,voltage constraint,current constraint and operation mode of the medium voltage ring network system,the bus voltage drop and incoming line current are taken as indicators.Evaluate the reliability of subway network support power supply system under different operating conditions,and realize network operation and resource sharing of power supply system.