采用自耦变压器供电的重载铁路牵引电缆贯通供电系统供电方案

针对采用自耦变压器(AT)供电的重载铁路,为了进一步提升其运能和再生制动能量利用率,提出一种采用AT供电的重载铁路牵引电缆贯通供电方案。首先,介绍了采用AT供电的重载铁路牵引电缆贯通供电方案;其次,研究采用AT供电的重载铁路牵引电缆贯通供电系统供电能力,推导该供电系统的等值模型,分析其电流分布关系,计算牵引网等值阻抗,结合其电压分布关系推导出供电能力数学模型,为方案的初步设计提供依据;然后,以某实际重载线路改造设计为案例,分别对既有方案和所提方案的供电能力和能耗情况进行仿真验证;最后,对改造成本及运营经济性进行了分析。分析结果表明所提方案能够延长供电距离,降低牵引供电系统能耗,提高再生制动能量利用率,节省外部电力资源,经济效益较为显著。

Power supply scheme of traction cable co-phase connected power supply system for heavy-haul railway powered by AT

Aiming at heavy-haul railways powered by AT(AutoTransformer),in order to further improve its capacity and the utilization rate of regenerative braking energy, a power supply scheme of heavy-haul railway traction cable co-phase connected power supply system powered by AT is proposed. Firstly, the proposed power supply scheme is introduced. Secondly, the power supply ability of the power supply system is studied, the equivalent model of the power supply system is established, the current distribution of the power supply system is analyzed, the equivalent impedance of traction network is calculated, and the mathematical model of power supply ability is deduced according to its voltage distribution relationship, which provides basis for the preliminary design of the scheme. Then, taking the transformation design of an actual heavy-haul line as a case, the power supply ability and energy consumption of the existing scheme and the proposed scheme are simulated and verified. Finally, the transformation cost and operation economy are analyzed. The analysis results show that the proposed scheme can extend the power supply distance, reduce the energy consumption of traction power supply system, improve the utilization rate of regenerative braking energy, and save external power resources, having good economic benefit.