基于改进HHT的电能质量扰动检测方法  

Power quality disturbance detection method based on improved HHT

作　　者：胡雷 陈湘波[1] 熊魁 周峰 岳长喜 李智成 Hu Lei;Chen Xiangbo;Xiong Kui;Zhou Feng;Yue Changxi;Li Zhicheng(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China.;Wuhan Branch of China Electric Power Research Institute,Wuhan 430071,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009 [2]中国电力科学研究院武汉分院,武汉430071

出　　处：《电测与仪表》2018年第21期105-111,共7页Electrical Measurement & Instrumentation

基　　金：国家电网公司科技项目(JL71-18-003);2016年安徽省质量工程重点教学研究项目(JYZD1607)

摘　　要：为了精确检测电网中复杂非平稳扰动信号的时频特性,提高希尔伯特-黄变换(HHT)方法的时频定位能力,提出了一种基于改进HHT的电能质量扰动检测方法。针对电压暂降与短时间中断、谐波和复合扰动信号,所提方法采用移动平均法对HHT得到的瞬时幅频参数进行均值化,进而从Hilbert谱中提取信号在不同时间和频率的能量密度,定位扰动信号的起止时刻。仿真结果表明,此方法能够准确、快速地获取谐波信号的频率成分、幅值及突变时刻,分析电压暂降与短时间中断信号的幅值及起止时刻,同样适用于复合扰动信号检测,相对于传统的HHT方法具有更高的精度及时频分辨率。In order to accurately detect the time-frequency characteristics of complex non-stationary disturbance signals in power grid and improve the time-frequency localization ability of the Hilbert-Huang transform(HHT),this paper presents a method to detect power quality disturbance based on improved HHT.For voltage drop and short-time interrupt disturbance signal,harmonic and compound disturbance signals,this method adopts the moving average method to average the instantaneous amplitude frequency parameters obtained by HHT,then,extracts the energy density of the signal in different time and frequencies from the Hilbert spectrum,and locates the start-stop time of disturbance signals.Simulation results show that the proposed method can obtain the frequency component,amplitude and mutation time of harmonic signal accurately and quickly,as well as analyzes the amplitude and start-stop time of voltage drop and short-time interrupt signal.It is also suitable for the detection of compound disturbance signals,has higher precision and time-frequency resolution compared with the traditional HHT method.

关 键 词：电能质量扰动信号 希尔伯特-黄变换(HHT) 时频特性 Hilbert谱 

分 类 号：TM933[电气工程—电力电子与电力传动]