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| 摘要: |
| 对故障电流信号噪声的频谱特性进行仿真研究表明，窄频带的高频信号不易很好的表故障高频暂态分量的特征，利用多分辨分析和小分解快速算法对故障暂态电流进行分析，可以充分反映故障暂态电流不同频率成分的特点，以此构成的暂态电流保护递推新判据，可以准确区分区内，区外故障。EMTP仿真证明了新方案的有效性。 |
| 关键词: 故障 暂态电流 无通信保护 频域特性 小波分析 递推判据 电力系统 |
| DOI： |
| 分类号:TM711 |
| 基金项目:四川省应用基础科学研究基金资助项目(2 30 30 4130 0 3)~~ |
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| Non communication protection based on transient current |
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CHEN Hao
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| Abstract: |
| The simulative study of the frequency domain character of power system fault current signal shows that the high-frequency signal with narrow frequency band can not better present the character of fault high-frequency transient component. The analysis of fault transient current with Mallat fast wavelet decomposition algorithm based on multi-resolution analysis can thoroughly reflect the fault transient current character of different frequency components. The new recursive criterion of transient current protection based on it can correctly identify the faults of both in-zone and out-zone. EMTP simulation proves its feasibility. |
| Key words: frequency domain character,transient protection,wavelet analysis,recursive criterion |
