摘要
我国传统干线电气化铁路一般采用单相工频25 kV牵引供电制式。为减少单相供电给外部三相电网带来的负序影响,牵引网采用轮换相序的方式沿铁路线布置。但由于机车负载很难时刻保持在牵引网各相序均匀分布,即使牵引网采用轮换相序的方式,仍难以避免给三相电网带来的负序影响。介绍了一种基于三相变压器与四象限变流器拓扑的Yd1三相平衡牵引供电系统,详细推导了其补偿原理,并通过仿真验证了系统方案及补偿原理的可行性。方案采用四象限变流器作为补偿装置,牵引负载功率由变压器和变流器共同提供,因此具有灵活性高、功率效率高等优势。同时,该Yd1三相平衡牵引供电系统结构简单,能很好地适用于机车试验线和检修所的应用场合。
China's traditional trunk electrified railway generally adopts single-phase power frequency 25 kV traction power supply system.In order to reduce the negative sequence impact of single-phase power supply on the external three-phase power grid,the traction network is arranged along the railway line by rotating the phase sequence.However,because the locomotive load is difficult to maintain the uniform distribution of each phase sequence in the traction network at all times,even if the traction network adopts the method of rotating phase sequence,it is still difficult to avoid the negative sequence impact on the three-phase power grid.This paper introduces a Yd1three-phase balanced traction power supply system based on the topology of three-phase transformer and fourquadrant converter,deduces its compensation principle in detail,and verifies the feasibility of the system scheme and compensation principle through simulation.The scheme uses the four-quadrant converter as the compensation device,and the traction load power is provided by the transformer and converter,so it has the advantages of high flexibility and high power efficiency.At the same time,the Yd1 three-phase balanced traction power supply system has a simple structure and can be well applied to the locomotive test line and maintenance station.
作者
李书谦
LI Shuqian(Chengdu Shanghua Electric Co.,Ltd.,Chengdu 610000,China)
出处
《电气应用》
2023年第6期9-15,共7页
Electrotechnical Application
关键词
三相平衡
牵引供电
负序补偿
three-phase balance
traction power supply
negative sequence compensation
