摘要
为改进传统不控整流机组导致的城市轨道交通供电系统供电安全性差的问题,基于双向变流器的柔性直流牵引供电技术已在城市轨道交通中开展现场实验,但柔性直流牵引供电系统控制特性影响下回流安全参数的分布规律尚缺乏研究。建立基于双向变流器的城轨柔性直流牵引供电系统潮流计算模型及回流安全参数计算方法,以国内某条实际线路参数为例,仿真分析双向变流器控制特性对钢轨电位、杂散电流分布规律和全线网络损耗的影响。研究结果表明,双向变流器牵引工况等效内阻较小、逆变回馈工况启动阈值电压较低时,可有效限制系统功率越区传输,将全线钢轨电位和杂散电流泄漏量限制在标准安全范围内,从而减小系统网络损耗,提升系统供电安全性与经济性。
In order to solve the problem of poor power supply security caused by uncontrolled rectifier unit in traditional urban rail transit power system, flexible DC traction power supply technology based on bidirectional converter has been tested in urban rail transit, but there is still a lack of research on the distribution of reflux safety parameters under the influence of the system’s operating characteristics. In this paper, a power flow calculation model of flexible DC traction power system of urban rail transit and the calculation method of reflux safety parameters based on bidirectional converters are established. According to the parameters of a real railway line in China, the influence of control characteristics of bidirectional converter on rail potential, stray current and network loss is simulated and analyzed. Results show that when the equivalent resistance of the bidirectional converter with traction operation is low and the trigger voltage with inverter feedback operation is small, the power over-zone transmission can be effectively restricted so that rail potential and stray current can be limited within the safety standard and the network loss can be reduced, which will help to improve system’ s power security and economy.
作者
郑子璇
丁雅雯
陈泽宇
杜贵府
王铀程
钱坤
ZHENG Zixuan;DING Yawen;CHEN Zeyu;DU Guifu;WANG Youcheng;QIAN Kun(School of Rail Transportation,Soochow University,Suzhou 215131,China)
出处
《铁道标准设计》
北大核心
2022年第8期143-151,共9页
Railway Standard Design
基金
国家自然科学基金项目(52007128)。
