Time-Domain Fault-Location Method on HVDC Transmission Lines Under Unsynchronized Two-End Measurement and Uncertain Line Parameters
Time-Domain Fault-Location Method on HVDC Transmission Lines Under Unsynchronized Two-End Measurement and Uncertain Line Parameters
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DOI：
10.1109/tpwrd.2014.2335748
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发表时间：
2015-03
影响因子：
4.4
通讯作者：
Yuansheng Liang;Wang Gang;Haifeng Li
中科院分区：
文献类型：
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作者：
Yuansheng Liang;Wang Gang;Haifeng Li
提出了一种新的高压直流输电线路时域故障测距算法。考虑两端测量不同步和线路参数不确定性，采用Bergeron线路模型构造时域故障测距方程。零时间参考点被设置为行进波波头在每一端处的到达采样点。所有采样点的时间标签随零时间基准而变化。因此，两端测量的时间差也发生了变化，等于行波头两端到达的时间差。这使得行波理论与贝杰龙时域故障测距方法相结合成为可能。此外，为了提高该方法的性能，还提出了不同频率之间的波速比值系数和数字带通滤波器。仿真和试验结果表明，该方法在GPS信号丢失的情况下，仍能准确定位高压直流输电线路的故障。
This paper presents a novel time-domain fault location algorithm on HVDC transmission lines. The Bergeron line model is adopted to construct a time-domain fault location equation, considering unsynchronized two-end measurement and uncertain line parameters. The zero time reference point is set to the sample point of arrival at each end for the traveling wave-head. Time-tags of all sample points change with the zero time reference. So the time difference of two-end measurements has changed also, and equals the time difference between arrivals at two ends for the traveling wave-head. That makes it possible to mix the traveling wave theory with the Bergeron time-domain fault location method. Besides, the ratio coefficient of wave velocities between different frequencies and digital band-pass filter are presented for better performance of the proposed method. Simulations and tests demonstrate that the proposed method can locate faults accurately on the HVDC lines even in the case of loss of signals from GPS.