基于小世界网络模型的补偿电网单相接地故障识别与选线

Single-phase grounding fault identification and line selection of compensation grid based on small-world network model

为解决补偿电网接地选线正确率不高,不能识别高阻接地和低阻接地故障的问题,提出了应用小世界网络理论进行单相接地故障识别和选线的新方法。研究了单相接地故障的四种类型,在实验室搭建了低压模拟补偿电网,并针对高阻和低阻接地建立了其故障前后的小世界网络模型,得出了各自的特征参数,以此可以区分不同的故障类型和接地线路。在此基础上,研制了相应的选线装置并进行了接地选线试验。试验结果表明,选线装置能够识别接地故障类型,正确选出接地故障线路,效果令人满意。

A new single-phase grounding fault identification and line selection method based on small-world network theory is proposed in order to solve the problems existed in compensation grid, for example, the correct rate of grounding fault line selection is not high and the line selection devices cannot recognize high-impedance and low-impedance grounding fault. Four types of single-phase grounding fault are analyzed. And a low-voltage simulation compensation grid is built in lab. For high-resistance and low-resistance grounding, the small-world network models are established before and after grounding faults and their characteristic parameters are drawn. This is the basis of identifying different grounding fault types and lines. Then a grounding fault line selection device is developed and a test is done. The results show that the device can identify the type of fault and that the correct rate of grounding fault line selection is satisfied.