Short-Circuit Characteristics Analysis of New Continuous Cable Traction Power Supply System
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摘要:
新型电缆贯通供电系统能够实现长距离输电、减少电分相数目，但两级供电模式将导致该系统结构复杂. 为研究电缆贯通供电系统短路特性，首先，建立单位长度的牵引电缆和接触网-钢轨的二端口网络参数，将各个子网络级联等效成1个二端口网络，进而转化为Ⅱ型电路，实现牵引电缆和接触网-钢轨任意长度的分布参数建模；由于接触网短路后导致机车电压下降，基于车网耦合关系采用迭代计算求解短路电流电压，仿真验证计算方法的准确性. 最后，解析不同短路类型的电气特性，重点分析分布电容对短路电流、电压的影响. 研究结果表明：分布电容会引起短路电流增大，且在不同短路情况下均造成牵引变压器输出电压增加；接触网短路电流由两侧牵引变压器共同提供，距短路点越远提供的电流越少；电缆相间短路对非故障回路机车运行影响最大.
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关键词:
- 新型电缆贯通供电系统 /
- 分布电容 /
- 二端口网络 /
- 接触网 /
- 短路分析
Abstract:New continuous cable traction power supply system (CCTPSS) can achieve long-distance transmission and reduce the number of electric phases. However, the two-stage power supply mode leads to the complex structure of the system. In order to reveal the short-circuit characteristics of CCTPSS, the two-port network parameters of traction cable and catenary-rail of unit length were established. Each sub-network was cascaded and equated with a two-port network, which was then transformed into a Π-type circuit for modeling the distribution parameters of the traction cable and catenary-rail of any length. The locomotive voltage drops after short circuit of catenary. Therefore, considering the coupling relationship between the train and the network, the short-circuit current and voltage were solved by iterative calculation. The accuracy of the calculation method was validated by simulation. Finally, the electrical characteristics of different short-circuit types were analyzed, with emphasis placed on the influence of distributed capacitance on short-circuit current and voltage. The results show that the distributed capacitance can increase the short-circuit current and, under different short-circuit conditions, the output voltage of traction transformer. The short-circuit current of catenary is jointly provided by traction transformers on both sides, and the farther away from the short-circuit point is, the less current is provided. The cable phase-to-phase short circuit has the greatest impact on the operation of the non-fault-circuit locomotive.
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图 17 三种短路非故障回路接触网电压
Figure 17. Voltage of non-fault-circuit catenary under three kinds of short-circuit conditions
表 2 回路D1、D2电缆首末端电流
Table 2. Head and end currents of D1- and D2-circuit cables
回路 电缆首端 电缆尾端 ${\mathrm{T}}_{{\mathrm{T}}_1} $ 中点 ${\mathrm{T}}_{{\mathrm{T}}_2} $ ${\mathrm{T}}_{{\mathrm{T}}_1} $ 中点 ${\mathrm{T}}_{{\mathrm{T}}_2} $ D1 161.2 406 869 265.8 523.5 1967 D2 346 49.5 30.21 409 107.3 58 
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