基于阻抗匹配平衡变压器和AT供电方式的新型同相牵引供电系统

A Novel Cophase Traction Power Supply System Based on Impedance Matching Balance Transformer and AT Power Supply Mode

电气化铁道的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隔,从而制约了高速、重载铁路的发展。基于阻抗匹配平衡变压器和AT供电方式的新型同相牵引供电系统,不仅可以解决以上问题,还继承了AT供电方式所特有的通信防护效果好、综合经济技术性能优越的特点;同时在有源滤波器的作用下,实现了单台双绕组工作变压器的接线方式,比原系统结线简单、维护方便。文中分析了系统平衡变换原理,讨论了系统的平衡方式、补偿电流检测与有源滤波器控制方法。分析和仿真证实本文提出的平衡方式和检测方法是正确的,同相供电系统方案是可行的。

Traction power supply systems for electrified railways have seriously-unbalanced three phases and a large amount of harmonics and reactive power, and such systems need neutral section insulators to be installed in all power districts. This lays restraints on development of high-speed and heavy-load railways. A novel cophase power supply system based on the impedance matching balance transformer and AT power supply can resolve all above-mentioned problems. It inherits the good effect of communication protection and superior comprehensive economic ＆ technological performance from the AT power supply. The active filter helps, this system realize wiring of the single transformer with duplex windings, which facilitates simple wiring and convenient maintenance as compared with the conventional systems. In this paper, the principle of balanced transformation is analyzed; the balance mode, detection of compensating currents and controlling method of the active filter are discussed. Analysis and simulation prove the proposed balance mode and detecting method are correct and the scheme of the cophase powersupply system is feasible.