电气化铁道牵引供电系统电压水平评估

Estimate on Voltage Level in Traction Power Supply System of Electrified Railway Traction

从牵引供电系统电压水平影响因素出发,利用多导体传输线理论推导了牵引网电压损失公式,分析了不同供电方式、不同进线短路容量、不同牵引变压器容量对供电系统电压损失的影响,提出了改善牵引网供电电压水平最有效的措施,即尽可能地减小牵引网电压损失。建议采用AT供电方式。此外,还分析了牵引网电压损失的实际值与工程值,提出了利用电压降模值计算高速铁路牵引网电压损失的方法。研究表明,该方法能有效评估实际牵引网供电臂末端电压水平。

In the paper,taking advantage of the multi-conductor transmission line （MTL） theory,the voltage-loss expressions in traction electric network are inferred based on the factors which affected the voltage level of traction power supply system.And the effects on voltage loss of transition electric network are also analyzed in different way of power supply,different capacity of short circuit,different transformer capacity and different load characteristic.Based on the mentioned factors,the paper concludes that the most effective way to improve the voltage level of traction electric network is trying to decrease its voltage-loss.Therefore,the AT power supply mode which is good at decreasing the voltage-loss is recommended.Moreover,through the comparison between the real values and engineering values of the voltage-loss in traction electric network,a new method which is taking advantage of the module value of voltage-drop is presented in the paper so as to calculate the voltage-loss in high-speed railway.The method is proved to be effective to estimate the voltage level in the end sections of traction power supply arms.