基于YNVD平衡变压器的电气化铁路电能质量管理系统

提出了一种基于YNVD平衡变压器的电气化铁路电能质量管理系统。该系统利用YNVD平衡变压器二次三角连接侧可引出三相抽头,连同二次V形连接侧安装的耦合变压器一起为单-三相背靠背变流器提供电气接口。相比于传统用于电气化铁路的背靠背变流器,该系统中使用的三相变流器比传统的单相变流器复杂,但该系统只需要1台耦合变流器,在一定程度上弥补了其不足之处。同时,三相变流器可以在c相桥臂开关发生故障时转变成单相变流器使用以保证系统补偿能力,而且可以在单相变流器故障情况下单独运行以保证系统补偿能力,所以该系统可靠性较高。根据理论分析搭建了MATLAB仿真模型及小容量原理样机,仿真和实验结果均验证了所提系统的有效性。

Power quality management system of electrical railway based on YNVD balance transformer

A power quality management system of electrical railway based on YNVD balance transformer is proposed. By using the delta connected secondary taps of YNVD balance transformer, together with the coupling transformer installed at the V-shape connected secondary side, an electric interface for a single-three phase back-to-back converter is provided. Compared with the traditional back-to-back converters, the proposed three-phase converter has more complex topology than single-phase one, while it only needs one coupling transformer, so that the disadvantages of the proposed system can be faded. Meanwhile, in order to keep the system compensation capacity, the three-phase converter can not only degenerate into single-phase converter on the malfunction of the c-phase bridge arm but also operate independently with the malfunction of single-phase inverter, which ensures the high reliability of the proposed system. Based on the theoretical analysis, a simulation model is built with MATLAB, and a small-capacity prototype is established. Both the simulative and experimental results verify the effectiveness of the proposed system.