地下网络短路故障定位

Jin Zhou, B. Ayhan, C. Kwan, O. D. Limaye, M. Lu, W. Lee
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引用次数: 4

摘要

在配电网中,阻抗性短路故障在早期很难检测到,因为故障电流可能不足以跳闸。本文综述了国内外在地下配电网短路故障定位方面的研究工作。首先,建立了仿真试验台。它可以模拟螺栓故障和阻抗故障的配电网。不同的支路可以添加不同的阻抗。注电点、负载节点、短路故障位置均可由用户自行调整。其次,搭建了与仿真试验台相对应的硬件试验台。第三,实现了两种新的故障定位算法(故障特征匹配和稀疏性恢复)。仿真结果与硬件实验结果吻合良好。通过大量的数值和实验数据验证了我们的故障定位算法。结果表明,在少量预先选择的节点上进行标准电压测量足以精确定位故障;因此,我们的故障定位方案是低成本的。此外,由于我们的算法只需要简单的矩阵计算,在几个周期内定位(<50ms)是可以实现的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Locating short-circuit faults in underground networks
In power distribution networks, impedance short-circuit faults are hard to detect in their incipient stage, as the fault currents may not be large enough to trip circuit breakers. In this paper, we summarize our research activities in short-circuit fault localization in underground power distribution networks. First, a simulation testbed was built. It can emulate power distribution networks with both bolted and impedance faults. Different impedances can be added to different branches. Power injection points, load nodes, and short-circuit fault locations can all be adjusted by users. Second, a hardware testbed corresponding to the simulation testbed was fabricated. Third, two novel fault localization algorithms (fault signature matching and sparisity recovery) were implemented. Results obtained from the simulation and hardware testbeds have excellent agreement. Our fault localization algorithms are validated by extensive numerical and experimental data. It is observed that, standard voltage measurements at a small number of pre-selected nodes are sufficient to localize the faults precisely; and hence, our fault localization scheme is of low cost. In addition, since our algorithms require only simple matrix calculations, localization within a few cycles (< 50ms) is achievable.
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