CEEMD与小波包单相接地故障选线算法对比

Comparison of CEEMD and Wavelet Packet Single-phase Ground Fault Line Selection Algorithms

目前,我国矿井供电系统多采用经消弧线圈接地的中性点运行方式,由于消弧线圈的补偿作用,基于稳态分量的选线算法已不再适用,而基于暂态分量的选线算法的选线效果也不理想。因此,以当前两种主流算法为研究对象,对理想信号以及加噪处理后的信号分别进行小波包分解和CEEMD分解,得出两种选线算法在不同情况下的选线结果,并分析了小电流接地系统单相接地故障选线装置选线准确率低的可能原因。通过RTDS进行了大量仿真验证,结果表明小波包算法在非理想状况下具有更高的可靠性。

The neutral point operation mode grounded by the arc suppression coil are frequently and mostly used in the mine power supply system in the nation.Due to the compensation effect of the arc suppression coil,the line selection algorithm based on the steady-state component is no longer applicable,and the selection based on the transient component is also no longer applicable,meanwhile the line selection effect of the line algorithm is generally not ideal.Taking the current two mainstream algorithms as the research object,wavelet packet decomposition and CEEMD decomposition are performed on the ideal signal and the signal after the noise processing,respectively,and the line selection results of the two line selection algorithms under different conditions are obtained and analyzed.Possible reasons for the low accuracy of the single-phase grounding fault line selection device of the small Current grounding system are also analyzed.A large number of simulation verifications have been carried out through RTDS,and the results show that the wavelet packet algorithm has higher reliability under non-ideal conditions.