静止无功发生器在牵引供电系统中的分析

Analysis of static var generator application in traction power supply system

针对电气化铁路中存在的无功、谐波和负序等严重影响电能质量的问题,研究静止无功发生器(SVG)在牵引供电系统中的综合补偿作用.分析了SVG装置对牵引负荷的综合补偿原理,并提出了三相系统补偿电流的检测方法和综合补偿的控制算法,再结合我国路某一铁路牵引变电所的运行数据进行仿真分析,结果表明:SVG具有控制灵活、调节速度快、调节范围广、连接电抗小、谐波量小等优点,能够有效治理电铁中存在的电能质量问题.

In order to improve the power quality of reactive power, harmonic and negative sequence current in the fast developing electrified railway systems, static vat generator and its effect on comprehensive compensation in the traction power supply system is studied in the paper. After analyzing the principle of comprehensive compensation on the traction load, the control algorithms and detecting methods of compensations for SVG are presented in three phase power system. Simulations with operation data from an electrified railway are carried out. Results show that SVC has some advantages, such as flexible control, fast and large range adjustment, small reactance and low harmonics, it can improve the power quality in traction power supply system effectively.