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New Criterion of Converter Transformer Differential Protection Based on Wavelet Energy Entropy

机译：基于小波能量熵的换流变压器差动保护新判据

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摘要

For converter transformer, current differential protection fails to operate in the case of internal fault occurs during dc bias or inrush current. Therefore, a new criterion is proposed in this paper to construct a new differential protection scheme. The new criterion is established by the ratio of wavelet energy entropy (RWEE) of current fault component on the primary to that on the secondary side. Once an internal fault occurs, the energy entropy (WEE) of the primary side is much larger than that on the secondary side, and then a large RWEE can be obtained. Otherwise, WEE of both sides are similar, and RWEE is around one. The simulation results show that the proposed criterion can perform well under inrush current, CT saturation, and dc bias conditions. It can discriminate the internal fault from external fault. Most importantly, it avoids the refusal of tripping when an internal fault occurs.
机译：对于转换器变压器，如果在直流偏置或浪涌电流期间发生内部故障，则电流差动保护将无法工作。因此，本文提出了一种新的准则来构造新的差动保护方案。通过一次侧电流故障分量与二次侧电流故障分量的小波能量熵（RWEE）之比来建立新的标准。一旦发生内部故障，初级侧的能量熵（WEE）远大于次级侧的能量熵，那么可以获得较大的RWEE。否则，双方的WEE相似，而RWEE约为1。仿真结果表明，所提出的准则在浪涌电流，CT饱和和直流偏置条件下均能良好地运行。可以将内部故障与外部故障区分开。最重要的是，它可以避免发生内部故障时拒绝跳闸。

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  • 来源
    《IEEE Transactions on Power Delivery》 |2019年第3期|980-990|共11页
  • 作者

    Deng Yujia; Lin Sheng; Fu Ling; Liao Kai; Liu Lei; He Zhengyou; Gao Shan; Liu Yilu;

  • 作者单位

    Southwest Jiaotong Univ, Dept Elect Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Dept Elect Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Dept Elect Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Dept Elect Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Dept Elect Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Dept Elect Engn, Chengdu 610031, Sichuan, Peoples R China;

    State Grid Shandong Elect Power Co, Dept Econ, Jinan 250021, Shandong, Peoples R China|State Grid Shandong Elect Power Co, Technol Res Inst, Jinan 250021, Shandong, Peoples R China;

    Univ Tennessee, Dept Elect Engn & Comp Sci, Knoxville, TN 37996 USA|Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Converter transformer; differential protection; current fault component; wavelet energy entropy;

    机译：转换器变压器;差动保护;电流故障组件;小波能量熵;

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