基于改进熵权法的调度端小电流接地选线方法

A Method of Small Current Grounding Line Selection at Dispatching Station Based on Improved Entropy Weight Method

摘要:

随着城市电网电缆线路比例加重及消弧线圈投入使用，谐振接地系统发生单相接地故障时面临着选线难度大、选线时间长、容易造成大量供电服务和安全风险问题。文中提出一种基于改进熵权法的调度端小电流接地选线方法。首先，分析了小电流接地系统的接地现象，结合实际运行经验提出了适用于调度主站端的3种选线判据，并通过改进熵权法进行合理的融合；然后，提出了针对谐振接地系统的动态补偿法并制定相应选线流程；最后，在成都地调主站端D5000系统上部署该选线方法并进行长时间实际运行验证。结果表明，该方法效果显著，解决了调度端谐振接地系统选线难题，单相接地平均故障处理时间减少了95%，有效提高了单相接地故障处置速度和准确性，具有较好的应用推广价值。

Abstract:

With the increasing proportion of cable lines in urban power grid and the application of arc suppression coil, when single-phase grounding fault occurs in resonant grounding system, it is faced with some problems, such as difficult line selection, long line selection time, a large number of power supply services and safety risks. A method of small current grounding line selection at dispatching station based on the improved entropy weight method is proposed. Firstly, the grounding phenomenon of small current grounding system is analyzed. Combined with the actual operation experiences, three line selection criteria suitable for the dispatching master station are proposed, and the reasonable fusion is carried out with the improved entropy weight method. Secondly, the dynamic compensation method for resonant grounding system is proposed, and the corresponding line selection flow chart is formulated. Finally, the selection method is deployed on the D5000 system at the dispatching main station of Chengdu local dispatching and verified for a long time. The results show that the proposed method has a remarkable effect and solves the line selection problems for resonant grounding system at dispatching station. It shortens 95% of the mean processing time for single-phase grounding fault and effectively improves the processing speed and accuracy of single-phase grounding fault, which has good application and popularization value.