基于V型接线的同相牵引供电系统

Cophase traction power supply system based on V connection

针对电气化铁道牵引供电系统存在大量的负序、谐波、无功,以及相邻供电区段分相绝缘器引起的列车速度和牵引力损失等问题,基于既有V型接线牵引供电系统,提出了一套同相供电系统的改造方案。在分析综合补偿原理的基础上,提出基于无锁相环的电流检测方法,建立综合潮流控制器容量模型及电能质量模型,并采用双向互补瞬时比较PWM控制策略。多重化主电路结构及满意优化补偿控制策略的提出,改善了系统的技术经济性。理论推导和仿真结果验证了方案的正确性与可行性。

The electric traction power supply system of electrified railway has abundant negative sequence, harmonics and reactive power,and the insulator between adjacent power supply sections may cause the traction power loss,for which,a modification scheme of cophase traction power supply is proposed to existing V connection traction power supply system. Based on the analysis of comprehensive compensation, a current detection method without PLL is presented,the integrated power flow controller capacity model and power quality model are established,and the bidirectional complementary instantaneous comparison PWM control is adopted. The structure of multiple main circuits and the control strategy of satisfactory optimization compensation are presented to improve the technical economy of system. The theoretical analysis and simulative results verify its feasibility and correctness.