交流27.5 kV牵引供电制式下地铁主变电所无功补偿方案研究

Study on Reactive Power Compensation Scheme for Main Substations of Subway under 27.5 kV Traction Power Supply Mode

在采用交流27.5 kV牵引供电制式的地铁或市域轨道交通110 kV主变电所的设计中,因电缆线路长而三相电力变压器容量小,故仅在35 kV侧设置补偿装置的方案未必适用。因此在110 kV侧设置磁控电抗器(MCR)、在35 kV侧设置SVG装置的方式对供电系统无功进行补偿是该供电制式下更为理想的补偿方案。本文以成都轨道交通17号线一座主变电所为案例,计算了无功补偿容量需求,描述了无功补偿装置设置方案,最后集合实测结果对补偿效果进行了技术和经济效益分析。

For the design of 110 kV main substations of subway or municipal rail transportation under 27.5 kV traction power supply mode,since the cable routes are long and the capacities of power transformers are small,so the scheme for setting of compensation device only at 35 kV side may not be applicable.Therefore,setting a magnetic controlled reactor(MCR)on 110 kV side and setting an SVH device on 35 kV side to compensate the reactive power of power supply system is a more ideal compensation scheme under this power supply system.Taking a main substation of Line 17 of Chengdu Rail Transit as an example,the paper calculates the demand for reactive power compensation capacity,describes the setting scheme of reactive power compensation devices,and finally analyzes the technical and economical benefits of compensation based on collection of measured results.