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首页> 外文会议>2015 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies >Identification method for internal and external faults based on amplitude feature of backward traveling wave for HVDC transmission line
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Identification method for internal and external faults based on amplitude feature of backward traveling wave for HVDC transmission line

机译：高压直流输电线路基于后向行波幅度特征的内外故障识别方法

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摘要

The theoretical analyses about the traveling wave transmission process for internal and external faults at HVDC transmission lines show that, in a short time, for internal faults, the backward traveling waves can be detected at both line terminals. For external faults, the backward traveling wave can be detected only at one line terminal. The backward traveling wave in the other terminal is zero in theory. Taking the calculation error and noise into account, the amplitude of the backward traveling wave is still very small. Thus, the identification method for internal and external faults for HVDC lines can be proposed by com paring the amplitude of the backward traveling waves at both ends of line. For internal faults, the ratio of the integral results is relatively small. However, for external faults, the ratio of the integral results is relatively large. Plenty of simulation results based on PSCAD/EMTDC indicate that the proposed protection method can discriminate internal faults from external faults under various fault conditions including faults with high fault resistances.
机译：对HVDC输电线路内部和外部故障行波传播过程的理论分析表明，对于内部故障，在短时间内可以在两个线路终端检测到反向行波。对于外部故障，只能在一个线路端子处检测到反向行波。理论上，另一端的后向行波为零。考虑到计算误差和噪声，后向行波的幅度仍然很小。因此，可以通过比较线路两端的反向行波幅度来提出高压直流输电线路内部和外部故障的识别方法。对于内部故障，积分结果的比率相对较小。但是，对于外部故障，积分结果的比例相对较大。基于PSCAD / EMTDC的大量仿真结果表明，所提出的保护方法可以区分各种故障条件下的内部故障与外部故障，包括具有高抗故障性的故障。

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