基于三相变四相变压器的新型同相牵引供电系统

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。

A New Cophase Traction Power Supply System Based on Three-phase to Four-phase Transformer

The traction power supply system of electric railway has the disadvantages of heavy unbalanced three phase,large harmonics and reactive power,needing neutral section insulator in every supply sector,which conditions the improvement of high speed and over loading railway.A new cophase traction power supply system based on three-phase to four-phase transformer proposed not only can resolve all the questions above,but also has the virtues of saving autotransformer,simple structure of balance transform set,easily being controlled and better balance effect,equalized load of each bridge arm of converter,better effect of communication defence,superior general economic technology indicator,and secure working.The principle of balanced transformation is discussed.The detecting method of the compensating currents and control mode of the active power filter are proposed.By analyzing and simulating,the proposed balance mode,detecting and control methods are verified to be true,and the proposed cophase power supply system is proved to be feasible.