城市轨道交通供电系统能馈装置无功协调控制方案研究

Research on Reactive Power Coordination Control Scheme of Energy Feedback Device in Urban Rail Transit Power Supply System

[目的]目前,城市轨道交通供电系统主要依赖于主变电所SVG(静止无功补偿器)进行无功补偿,夜间非运营时分,城市轨道交通供电系统中压环网线路基本处于空载状态,线路充电无功功率大,使得SVG长期重负荷运行。为缓解SVG的补偿压力,提出了一种能馈装置无功协调控制方案,协调SVG与牵引变电所的能馈装置共同参与无功补偿。[方法]分析了能馈装置的无功补偿容量计算方法,提出了SVG与能馈装置无功协调控制策略,最后通过某地铁线路现场试验来验证SVG与能馈装置无功协调控制策略的正确性。[结果及结论]当某地铁线路全线的能馈装置全部投入无功补偿之后,SVG无功补偿容量最大可以下降2.6 Mvar,中压环网线路有功损耗功率可从0.7 MW下降至0.5 MW。

[Objective]Currently,the urban rail transit power supply system mainly relies on the main substation SVG(static var compensator)for reactive power compensation.During non-operating hours at night,the medium voltage loop network lines of urban rail transit power supply system are basically unloaded,and the charging reactive power of the lines is high,causing SVG to operate under heavy load for a long time.To alleviate the compensation pressure of SVG,a reactive power coordination control scheme for energy feedback device is proposed,coordinating SVG and the energy feedback devices in the traction substation to jointly participate in reactive power compensation.[Method]The calculation method of the energy feedback device reactive power compensation capacity is analyzed,and the reactive power coordination control strategy for the SVG and energy feedback device is proposed.Finally,on-site tests on a certain metro line are performed,verifying the correctness of the above strategy.[Result&Conclusion]When the energy feedback devices of a metro line are all put into use for reactive power compensation,the SVG reactive power compensation capacity can be reduced by 2.6 Mvar to the most,and the total active power loss of the me-dium voltage loop network line can be reduced from 0.7 MW to about 0.5 MW.