CAJ | 학술논문

快速准确地得到配电网故障位置,对配电网系统安全稳定运行、快速恢复供电具有重要意义。提出一种基于经验模态分解(empirical mode decomposition,EMD)和维格纳威尔分布(Wigner Ville distribution,WVD)的电缆双端故障定位方案。通过对测量得到的故障行波进行EMD分解,实现对故障高频成分的提取与噪声的消除。将得到的一阶本征模态函数(intrinsic mode function,IMF)进行WVD分离,将故障信号的能量在时间及频率坐标系下表述出来。通过计算故障行波的瞬时能量曲线峰值,确定故障初始行波波头的到达时刻。仿真及实验结果表明,所提方案能够准确地确定故障初始行波波头的到达时刻,使电缆双端行波同步。与需要同步时钟的双端定位方法比较,具有较高的定位精度。在实际工程中有良好的应用前景。
쾌속준학지득도배전망고장위치,대배전망계통안전은정운행、쾌속회복공전구유중요의의。제출일충기우경험모태분해(empirical mode decomposition,EMD)화유격납위이분포(Wigner Ville distribution,WVD)적전람쌍단고장정위방안。통과대측량득도적고장행파진행EMD분해,실현대고장고빈성분적제취여조성적소제。장득도적일계본정모태함수(intrinsic mode function,IMF)진행WVD분리,장고장신호적능량재시간급빈솔좌표계하표술출래。통과계산고장행파적순시능량곡선봉치,학정고장초시행파파두적도체시각。방진급실험결과표명,소제방안능구준학지학정고장초시행파파두적도체시각,사전람쌍단행파동보。여수요동보시종적쌍단정위방법비교,구유교고적정위정도。재실제공정중유량호적응용전경。
Fast and accurate fault location for distribution network plays an increasingly important role to the safe and stable operation and resuming electricity supply. This paper presented a new two-terminal fault location algorithm for buried cable based on empirical mode decomposition (EMD) and Wigner Ville distribution (WVD). The extraction of the high frequency components and the elimination of the noise is realized through decomposing the measured fault traveling wave by EMD. Through separating the intrinsic mode function (IMF) by WVD, which can express the energy of the fault signal at the coordinate system of time and frequency. The arrival instant of the first fault wavefront is confirmed through calculating the peak value of the instantaneous energy curve from the fault traveling wave . The results of simulations and experiments proved that this fault location algorithm can not only find the arrival time of the first fault wavefront accurately, but also solve the asynchrony problem perfectly. Comparing with the existing fault location algorithm with GPS, it has a higher precision and a good application prospect in the practical engineering.