高速铁路牵引供电系统双边供电循环功率降低措施

Circulation Power Reduction Measures for Bilateral Power Supply of High-Speed Railway Traction Power Supply System

基于采用双边供电方式的高速铁路牵引供电系统,推导空载和负载工况下循环功率与相邻2个牵引变电所间电压相位差的关系;分析电压移相器的补偿原理和基本结构,研究通过注入1个与牵引变电所馈线电压垂直的正交电压,调节本所馈线电压相位,以减小电压相位差和降低循环功率的可行性。以某相邻牵引变电所实测电压数据为基础,搭建包含电压移相器在内的双边供电系统仿真模型,针对牵引网上空载、单台机车负载2种工况分别进行验证。结果表明:空载时循环功率与电压相位差的正弦值呈正比,负载时随着供电臂距离延长和牵引负荷的增加,循环功率将不存在,但负载不平衡度会随着电压相位差的增大而增大;安装电压移相器后,空载时可有效减小均衡电流,负载单台机车时可防止循环功率在牵引供电系统中流动,减小负载不平衡度,并降低牵引网上的传输损耗。

Based on the high-speed railway traction power supply system with bilateral power supply, the relationship between the circulating power and the voltage phase difference between two adjacent traction substations under no-load and load conditions was deduced. By analyzing the compensation principle and basic structure of the voltage phase shifter, the feasibility of adjusting the voltage phase of the feeder by injecting a quadrature voltage perpendicular to the feeder voltage of the traction substation, so as to reduce the voltage phase difference and the circulating power was studied. Based on the measured voltage data of an adjacent traction substation, a simulation model of bilateral power supply system including a voltage phase shifter was built to verify the two operating conditions of no-load and single locomotive load on the traction network.Results show that the circulating power is proportional to the sine value of the voltage phase difference under no load. As the distance of the power supply arm increases and the traction load increases under load, the circulating power will not exist, but the load imbalance will increase with the increase of the voltage phase difference. After installing the voltage phase shifter, the balanced current can be effectively reduced when there is no load. When a single locomotive is loaded, the circulating power can be prevented from flowing in the traction power supply system, the load imbalance can be reduced, and the transmission loss of the traction network can be reduced.