One-mode component-based fault section location method for mine high-voltage power network
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摘要: 矿井高压电网发生单相接地故障后，快速识别故障区段对矿井电网的安全稳定运行具有重要意义。现有配电网故障区段定位研究鲜少涉及矿井高压电网，而传统稳态法用于中性点经消弧线圈接地系统时存在定位死区，暂态法需配合选相装置使用且存在故障特征量随时间衰减的缺点。通过分析矿井高压电网单相接地故障附加状态下经Clark变换得到的电流一模分量特征，得出故障点上游电流一模分量明显大于故障点下游、电流一模分量不受故障相及消弧线圈电流影响的结论，从而提出一种无需选相、基于一模分量的矿井高压电网故障区段定位方法。该方法利用Clark变换得到矿井高压电网故障附加状态下各监测点的电流一模分量，计算各区段两侧的电流一模分量幅值差值，根据故障路径在分支节点处的电流一模分量幅值差值最小确定故障路径，再依据故障区段两侧电流一模分量幅值差值在故障路径上最大确定故障区段。仿真及实验结果表明，该方法在矿井高压电网任一相发生单相接地故障时均能实现准确的故障定位，不受故障初始角、故障接地电阻、故障位置和系统运行方式的影响。
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关键词:
- 矿井高压电网 /
- 中性点经消弧线圈接地系统 /
- 故障区段定位 /
- 单相接地故障 /
- 故障一模分量 /
Abstract: After a single-phase grounding fault occurs in the mine high-voltage power network, it is important to identify the fault section quickly for the safe and stable operation of the mine power network. The existing research on fault section location in distribution networks rarely involves mine high-voltage power network, while the traditional steady-state method has a dead zone when it is used for neutral point grounding system via arc suppression coil. And the transient method needs to be used with phase selection device and has the disadvantage that the fault characteristic quantity decays with time. By analyzing the characteristics of the one-mode component of the current obtained by Clark transform under the single-phase grounding fault additional state of the mine high-voltage power network, it is concluded that the one-mode component of the current upstream of the fault point is significantly larger than that downstream of the fault point, and the one-mode component of the current is not affected by the fault phase and the arc suppression coil current. A location method of the fault section of the mine high-voltage power network based on the one-mode component without phase selection is proposed. The method uses Clark transform to obtain the current one-mode components of each monitoring point in the fault additional state of the mine high-voltage power network, and calculates the current one-mode component amplitude difference on both sides of each section. The fault path is determined according to the minimum current one-mode component amplitude difference at the fault path branch node, and then the fault section is determined according to the maximum current one-mode component amplitude difference on both sides of the fault section at the fault path. Simulation and experimental results show that the method can achieve accurate fault location when a single-phase grounding fault occurs in any phase of the mine high-voltage power network, and is not affected by the initial fault angle, fault grounding resistance, fault location and system running mode. -
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