枢纽牵引供电系统谐波问题探讨

Researches on Harmonics of Hub Traction Power Supply System

结合上海南翔枢纽牵引变电所实际情况,介绍了枢纽牵引供电系统输电网络特性。基于现场实测数据,分析了不同牵引负荷和不同运行工况下牵引变电所的谐波特性。应用Matlab/Simulink仿真软件搭建了枢纽牵引供电系统仿真分析模型,仿真分析了接入牵引网数量对牵引供电系统谐波阻抗特性、不同行车运行工况下系统谐波畸变的影响。仿真结果表明,枢纽牵引供电系统存在主谐振点和多谐振点构成的谐振带;系统谐波频带丰富,极易造成高次谐波放大,进而造成谐波畸变率增大。对此,论文最后提出了一些抑制措施。

With combination of actual situation of traction substation at Shanghai Nanxiang railway hub, the transmission characteristics of hub traction power supply system have been illustrated. And harmonic characteristics of the traction substation under different traction loads and different operation modes are analyzed on the basis of data tested at site. Matlab/Simulink simulation software is used to establish a simulation and analyzing model for traction power supply system, by which the influences to harmonic impedance and harmonic distortion caused by connected number of traction networks under different operation status are simulated and analyzed. The simulation results show that there are resonant frequencies formed by main resonant point and multiple resonant points in the hub traction substation system; the system harmonic bands are abundant and liable to cause enlargement of higher order harmonics and increasing of harmonic distortion rate. Therefore, some suppression measures are proposed finally in this paper.