220kV变电站10kV直供负荷的改善措施及其经济分析

Improvement Measures and Economy Analysis on 10kV Direct Power Supply Load from 220kV Substations

为了协调220 k V与110 k V变电站布点关系,结合某省220 k V变电站三卷变压器10 k V低压侧直接向负荷供电(简称直供)的实际情况,对全省220 k V变电站进行统计分析,研究其直接供电的现状及运行中反映的问题,并有针对性地从技术和经济层面提出解决办法:对10 k V直供负荷供电时,将配电网规划和10 k V直供负荷相结合,优化配电网的结构,合理利用220 k V变电站的容量,由220 k V变电站向周边10 k V负荷系统直接供电,在确保供电可靠性的情况下,控制10 k V线路的送电距离。以上措施可挖掘现有电网的供电潜能,降低线路损耗,使电网布局更趋合理。

In order to coordinate the locations of 220 kV and 110 kV substations, a statistic analysis is made of the 220 kV substations based on the direct power supply situation from the 10 kV side of the 220 kV three-volume transformers in a province. The existing problems of direct power supply are studied and corresponding solutions are proposed from both technical and economic aspects. The solutions include： combining the distribution network planning with the 10 kV direct supply loads, optimizing the structure of the distribution system, reasonably utilizing the capacity of 220 kV substations, direct supplying power to the nearby 10 kV load system from the 220 kV substations, and controlling the delivery distance to ensure the system reliability. The above-said solutions can exploit the potential of the existing power network, decrease the line power loss, and make the distribution of the power grid more reasonable.