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电气化铁道牵引供电系统三相严重不平衡,存在大量的谐波和无功;各供电区段需要用分相绝缘器分断,制约了高速、重载铁路的发展。该文提出的基于三相变四相变压器的新型同相牵引供电系统,不但可以解决以上问题,而且具有省自耦变压器,平衡变换装置结构简单、易控制、平衡效果好,变流器各桥臂负荷均衡,通信防护效果好,综合经济技术性能优越,工作可靠等优点;文中讨论了平衡变换原理,给出了补偿电流检测与有源滤波器控制方法。分析和仿真证明提出的平衡方式、检测与控制方法是正确的,同相供电系统方案是可行的。
There are a lot of harmonics and reactive power in the three phases of electrified railway traction power supply system. The power supply sections need to be separated by phase-separated insulators, which restrict the development of high-speed and heavy-haul railway. The new co-phase traction power supply system based on three-phase variable four-phase transformer proposed in this paper can not only solve the above problems, but also has the advantages of simple structure, easy control and balancing effect of provincial autotransformer. Load balance, good communication protection, superior economic and technical performance, and reliable work. In the paper, the principle of balance transformation is discussed and the compensation current detection and active filter control method are given. Analysis and simulation show that the proposed balance method, detection and control method is correct, the same phase power supply system is feasible.