基于多分量融合的调度端小电流接地选线策略

针对中性点不接地的配电系统站端接地选线方式投资大、维护成本高,零序电流采样监测运行维护困难的问题,提出一种基于多分量融合的调度端小电流接地选线方法。首先,在现有调度自动化系统监测数据集中,针对性分析了对接地故障较为敏感的单分量特征及其影响因素;其次,综合考虑实际运行可靠性和判断准确性,提出了基于三角模融合的接地选线判据;进而通过归一化计算各线路接地概率,实现在调度端远程的故障线路准确选线;最后,通过在某电力公司实际部署基于所提方法的小电流接地选线功能模块进行实测验证。运行结果显示,所提方法具有良好的选线成功率,能够较好支撑调度端的远程故障定位,具有较高的推广价值。

Selection Scheme of Small Current Grounding Line at Dispatching Terminal Based on Multi-component Fusion

In view of the shortcomings of large investment, high maintenance cost and difficult monitoring of zero-sequence current sampling, a selection scheme for small current grounding line at dispatching terminal based on multi-component fusion is proposed, and a new criterion of grounding line selection is obtained through theoretical analysis. A small current grounding line selection module based on the criterion is deployed in a power company. The actual operation results show that the proposed line selection strategy is correct in theory and has a high success rate, which has a high popularization value