配电网单相接地分布式补偿特性

Distributed Compensation Performance While the Single Phase to Earth Fault Occurring in the Distribution Network

为解决配电网系统电容电流急剧增加给消弧线圈增容改造带来的困难,详细介绍了一体式补偿装置原理,并分析提出了配电网分布式补偿方式。基于PSCAD/EMTDC仿真环境,搭建了典型配电网模型,从一体式补偿装置的安装位置、补偿容量等方面研究了配电网单相接地电流的分布式补偿特性,并通过了变电站试验验证。当发生单相接地故障时,一体式补偿装置和主站消弧线圈可相互配合,共同对配电网进行有效补偿;消弧线圈安装在母线、故障线路末端、非故障线路末端或者主站增容几种情况下,故障残流均可被补偿至允许范围。分布式补偿装置的补偿容量与安装线路的电容电流相当时,补偿后的故障残流最小。结果表明,分布式补偿方法简单可靠、成本低、补偿有效。

Increasing application of cable leads to sharp increase in capacitance current,and original capacity of arc extinction coil no longer meets the demands.The compensation performance is outstanding because of low cost and flexible installation.We researched the flexibility of distributed arc suppression coil by the location and capacity,and analyzed the cooperation with arc extinction coil of principal station.Moreover,we established and experimentally verified a simulation model.The results indicate that,fault residual current is the minimum if installed at the end of longer cable and the current match with the line.