同相供电系统的牵引供电分区保护方案

Protection Scheme for Traction Power Supply Partition Based on Co-phase Power Supply System

贯通式同相供电系统能够取消全线的电分相,在改善电能质量和提高列车运行速度等方面具有优势。若依然采用传统的保护系统,那么全线贯通后的系统将会是脆弱的。此时牵引网上只要有1处发生故障,整条线路都会受到影响,甚至会使牵引网停止运行。为此,对牵引网分段供电测控技术进行研究,利用MATLAB和Simulink软件分别对测控系统各部分建模,并模拟了牵引网短路故障时保护动作的情况。以某市的地铁18号线和22号线为例,通过分析故障前后分段所处电压波形的变化情况,验证了该测控方案的可行性与准确性。

Continuous co-phase power supply system can eliminate electrical phase separation from the entire line,having advantages in improving power quality and improving locomotive running speed.However,if the conventional protection system is adopted,the system after the whole line being launched will be fragile,because one failure in the traction network can affect the entire line,even stopping the traction network.Targeting this issue,a traction network section power supply measurement and control technology is studied.Using MATLAB/Simulink software,each part of the measurement and control system is modeled,and the protection behavior during short-circuit fault of traction network is simulated.Taking the Metro Line 18 and Line 22 as an example,by analyzing the voltage waveform before and after the fault,the feasibility and accuracy of the measurement and control method are verified.