基于改进广义S变换的电能质量扰动检测算法  

Power Quality Disturbance Detection Algorithm Based on Modified Generalized S-transform

作　　者：郑慧龙 赵庆生[1] 郭贺宏[2] 

机构地区：[1]太原理工大学电气与动力工程学院,山西太原030024 [2]山西省电力公司,山西太原030001

出　　处：《水电能源科学》2014年第8期182-185,共4页Water Resources and Power

基　　金：山西省回国留学人员科研项目(2010-34);山西省自然科学基金项目(2010011024-1)

摘　　要：电能质量问题日趋严重,快速准确地检测扰动是治理和改善电能质量的前提。针对目前检测方法存在的较大缺陷,在广义S变换的基础上提出了一种基于改进广义S变换的电能质量检测方法,能够针对性地选择合适参数,灵活地控制高斯窗宽度,兼顾了全时段的时间和频率分辨率。将其应用于电压暂降、暂态振荡、暂态脉冲及谐波等信号的检测和分析中,利用最大频谱曲线、高频时间幅值曲线、基频幅值曲线和时频谱图判断扰动的频率成分、起止时刻和幅值变化。结果表明,该方法简单直观,检测精度较高,能灵活地调节时频分辨率。The problem of power quality has been increasingly serious. The premise to governance and improve power quality is detection of disturbance quickly and precisely. For current detection methods having some larger defects, the method of power quality detection based on modified generalized S-transform is proposed on the basis of generalized Stransform, which is able to select the appropriate parameters specifically and control the width of Gauss windows flexibly, time and frequency resolution is realized taking into account all the time period. Finally, this algorithm is applied to detect and analyze signals such as voltage sags, transients oscillation, transient pulse and harmonics. The maximum spectral amplitude curves, high frequency amplitude curve, fundamental frequency amplitude curve and time-frequency spectrum graph are used to judge disturbance frequency components, disturbance start and end time and amplitude changes. The results show that the algorithm is simple, intuitive and has high detection accuracy, which can adjust time-frequency resolution flexibly.

关 键 词：电能质量 广义S变换 改进广义S变换 扰动检测 时频分辨率 

分 类 号：TM71[电气工程—电力系统及自动化] TM744