摘要
根据故障线路与健全线路暂态零模电流在幅值大小、频率分布以及故障瞬间突变极性的差异,提出基于HHT的谐振接地配电网暂态量选线新方案。从能量的角度综合度量线路暂态零模电流的幅值大小和频率分布,将EMD与能量法相结合,定义固有模态能量和能量权重系数两个暂态故障特征参数,选出能量权重系数最大的前三条线路,接着利用故障发生瞬间故障线路与健全线路暂态零模电流突变极性相反这一暂态故障特征,应用HHT奇异性检测原理,比较能量权重系数最大的前三条线路暂态零模电流最高频IMF分量在故障时刻的一阶差分极性,形成选线判据,构造基于HHT的暂态量选线方案。利用Matlab验证了方法的正确性,分析表明所提出的暂态量选线方案灵敏性和可靠性高。
According to the differences of amplitude,frequency distribution and mutation polarity of transient zero mode current of fault line and non-fault line,a new transient fault line selection scheme based on HHT is put forward.By using energy to measure the amplitude and frequency distribution of transient zero mode current,and the EMD is combined with the energy method to define the intrinsic mode energy and energy weight coefficient,the first three lines with the biggest energy weight coefficient are chosen.Then considering that the transient zero mode current mutation polarity of fault line and non-fault line is reverse,by applying HHT singularity detection principle,comparing the first order difference polarity of the highest frequency IMF component of transient zero model current of the three chosen lines,the line selection criterion is formed to structure the transient line selection scheme based on HHT.The validity of the method is verified by Matlab.The analysis shows that the proposed transient line selection scheme has high sensitivity and reliability.
出处
《测控技术》
CSCD
2017年第3期14-19,共6页
Measurement & Control Technology
基金
国家自然科学基金青年科学基金项目(61403127)
关键词
暂态量故障选线
HHT
EMD
固有模态能量
能量权重系数
一阶差分极性
transient fault line selection
Hilbert-Huang tranform
empirical mode decomposition
intrinsic mode energy
energy weight coefficient
first order difference polarity
