全电缆出线变电站扩建无功补偿配置工程实践分析

Practical Analysis for Reactive Power Configuration of 110 kV Substation Expansion with All Cable Line

随着城市的发展,城市中心区110 kV变电站多数采用全电缆出线,充电功率较大。而由于历史原因,部分城区110 kV变电站未预留电抗器布置条件,造成电压调整困难。以某110 kV站扩建为例,研究城区全电缆出线110 kV变电站改扩建无功配置方案;考虑周边变电站实际运行现状,在变电站配置低压电抗器以补偿电网小方式运行条件下的盈余无功功率;考虑充分利用电缆线路的充电功率,减少站内电容器补偿容量;结合远景规划、现状及二期扩建需求,研究合理的无功配置方案。通过平衡分析,提出了变电站无功补偿调整配置思路,对同类型的变电站具有借鉴意义。

With the development of the city,the eliciting lines of the most of the 110 kV substations in the city center area use cable and produce very large reactive power.However, some urban 110 kV substation was built without foreseeing the necessity of reserving the space for implementation of new reactors ,resulting in difficulties in full-fill the requirements on voltage adjustment.Take the extension of an 110 kV substation as an example.In order to compensate the surplus reactive power,a scheme of configuring the reactors in the substation is considered.On the basis of adequate utilization of the reactive power of the lines,the reduction of the size of the compensation capacitors in the station is discussed.Considering the possible future plan,the current situation and the demand of the expansion,a reasonable configuration scheme of reactive power is studied. Through the analysis to the reactive power compensation, a method on adjusting the reactive power compensation is proposed. This provides valuable guidance to the same type of substations.