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为了抑制无功倒送,降低电压波动,消除谐波等,有必要在地铁主变电所的中压母线上加装动态无功补偿装置。目前,国内大部分城市如上海、广州、天津和南京等地铁线路均采用集中供电方式,设置110/35kV地铁主变电所取得城市电网电源(除广州为110/33kV,上海110/33/10kV混合网外)。集中供电方式下,地铁沿线路敷设如35kV中压电缆贯通并给地铁牵引降压变电所供电,牵引电压一般采用DC1500V,动力照明电压采用0.4kV。
In order to restrain reactive power transfer, reduce voltage fluctuations, eliminate harmonics, it is necessary to install dynamic reactive power compensation device on the medium voltage bus of Subway Main Transformer substation. At present, most of the cities in China, such as Shanghai, Guangzhou, Tianjin and Nanjing, use centralized power supply mode to set up 110 / 35kV Substation main substation to obtain the urban power grid (except 110 / 33kV in Guangzhou and 110/33 / 10kV in Shanghai Mixed network outside). Under the centralized power supply mode, the subway is laid along the line such as 35kV medium voltage cable and supplies power to the traction traction substation. The traction voltage is generally DC1500V, and the power lighting voltage is 0.4kV.