基于功率差动同相供电平衡变换系统保护研究

Study on the Protection for Balance-converting-system of Cophase Traction Supply Based on the Active Power Differential

平衡变换系统是同相牵引供电系统实现的核心设备,因此其保护工作显得尤其重要。针对同相供电实现的基本要求,分析了平衡变换系统的基本工作原理,并研究其运行过程中系统功率流通情况,首次提出了基于有功功率差动的平衡变换系统保护方案。利用Matlab/Simulink对平衡变换系统正常运行及区内外故障等工况进行仿真,仿真结果证明,基于有功功率差动的同相供电平衡变换系统保护方案是可行的。

Because of the Balance-converting-device＇s（BCD） importance for the cophase traction power supply system,the protection for the BCD is essential.Considering of the special demands of the cophase traction supply system,this paper analyzes the operation principle of the BCD and researches it＇s power flow.A novel protection based on the active power differential is proposed.Simulation with Matlab/Simulink is presented under the BCD＇s normal and inside/outside fault operation.The simulation result shows that the protection based on the active power differential is feasible.