利用电力电子技术构建的新型牵引供电系统

New Traction Power Supply System Constructed by Power Electronic Technology

由于当前牵引供电系统结构的特殊性,存在着谐波、无功、负序、通信干扰、“过电分相”等其自身无法解决的问题。其中“过电分相”还对高速铁路的安全、可靠运行构成了威胁。文章提出了利用电力电子技术和不同接线方式的变压器以及AT牵引网构成的新型牵引供电系统。新系统采用了AT供电方式,具有综合经济技术性能优越的通信防护效果,利用电力电子技术滤除了谐波、补偿了无功、消除了系统不平衡,实现了同相供电,解决了过电分相问题。分析仿真证实新型牵引供电系统不但可以解决当前牵引供电系统所存在的问题,且可以提高供电的质量与效率,增强供电的可靠性与安全性。

Because of particularities in traction power supply system, the defects of harmonics, reactive power, negative,communication jamming and crossing neutral sections are exist.Crossing neutral sections also affect high speed railway in safe and reliability. Power electronic technology, transformers with different connections and new traction power supply system constructed by AT traction mode are presented. AT supply mode is employed for the new system, which has superior general econmic technology indicator in communication defense. Harmonics are removed, reactive power is compensated and unbalance is eliminated by power electronic technology. It realizes cophase power supply, solves the problems in crossing neutral sections. The simulation verifies that this system not only can resolve those problems in present system,but also improve supply quality and efficiency, enhance reliability and safety.