基于YN-vd接线变压器的新型同相牵引供电系统

提出了由一种YN-vd接线平衡变压器和平衡变换装置BCD(Balance Converting Device)构成的铁道牵引系统同相供电方案.平衡变换装置由2个电压型单相有源滤波器构成,用以补偿负载的无功和谐波电流,以及变压器2个副边绕组的不平衡电流.无论牵引负载的性质及负荷的分布情况如何,经过变换之后,变压器的输入侧都表现为三相对称的纯阻性负载.分析了系统的结构和工作过程,提出了单相有源滤波器的状态优化控制方法.以一列满载运行的机车为对象,进行了供电系统的软件仿真研究,仿真结果证实了系统结构和控制方法的正确性.

Cophase traction power supply system based on YN-vd connection transformer

A cophase power supply system for electrified railway traction is presented,which is composed of YN-vd connection balance transformer and BCD(Balance Converting Device). The latter consists of two voltage - type single - phase APFs(Active Power Filters) for compensating the reactive power and harmonic current of loads and the unbalanced current between the secondary coils of transformer. No matter what features of traction load and distribution of loads are,the input sides of transformer present 3-phase symmetrical resistant loads after conversion. The system topology and its working principle are analyzed and optimal state control for single - phase APF is proposed. With a full - load locomotive as an example,the software simulation of power supply system is carried out and results show the correctness of system topology and control method.