为解决传统的利用电气特征量进行接地选线存在的诸多问题，提出了基于小世界加权拓扑模型的配电网接地选线新方法。首先，对一单母线的10 kV 配电网进行了小世界建模，计算得到了相同线路发生不同接地故障的特征参数，所得的特征参数可以显著地区分不同类型的接地故障。然后建立了不同线路发生相同接地故障的小世界加权拓扑模型，根据线路的长度设定了权值，并计算得到不同线路发生接地故障时的加权平均距离。模拟实验结果表明，越长的线路发生接地故障后其加权平均距离越小，因此可将加权平均距离作为接地故障选线的判据。在同一条线路发生高阻接地相较于金属性接地来说，加权平均距离明显降低，这反映了高阻接地因增大了零序回路的阻抗，而导致了故障传播深度的减小。%In order to solve the problems existing in grounded fault line selection using the traditional method of the electrical characteristics, a new grounded fault line selection method for compensation grid based on small-world weighted topology model is proposed. Firstly, the small-world model of high-voltage simulation network built in lab is established and the characteristic parameters under different grounded fault on the same line are calculated out. Obviously the characteristic parameters can distinguish out the different grounded fault. Then the small-world weighted topology models under the same grounded fault on the different line are created. According to lines’ length, the weighted value formula of lines is proposed and weighted average distances under the same grounded fault on the different lines are calculated out. Lastly, the simulation test is done and the results show that if the longer line is grounded, its small-world model’s weighted average distance is shorter. Therefore the weighted average distance can be acted as criterion of grounded fault line selection. And the results also show that compared to the metal grounded fault, the high-resistance grounded fault has shorter weighted average distance, which explains that the depth of the fault propagation decreases due to increasing impedance of the zero-sequence circuit.
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