S变换用于电能质量扰动特征提取分析的研究  

Research on S-transform Used in Power Quality Disturbance Feature Extraction and Analysis

作　　者：张立鹏 刘晓倩 戴振 李建文 秦刚 ZHANG Lipeng;LIU Xiaoqian;DAI Zhen;LI Jianwen;QIN Gang(State Grid Jibei Electric Power Co.,Ltd.,Langfang Power Supply Company,Langfang 065000,China;Xianghe Power Supply Branch of State Grid Jibei Electric Power Co.,Ltd.,Langfang 065000,China;School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China;State Grid Jiangxi Electric Power Co.,Ltd.,Jiujiang Power Supply Branch Company,Jiujiang 332000,China)

机构地区：[1]国网冀北电力有限公司廊坊供电公司,河北廊坊065000 [2]国网冀北电力有限公司香河县供电分公司,河北廊坊065000 [3]华北电力大学电力工程系,河北保定071003 [4]国网江西省电力有限公司九江供电分公司,江西九江332000

出　　处：《电力科学与工程》2021年第11期12-22,共11页Electric Power Science and Engineering

基　　金：河北省自然科学基金(E2017502053);国网冀北电力有限公司科技项目(520184170002)。

摘　　要：为了提升新能源电力系统中暂态扰动与高频扰动的分析精度,对广义S变换、多分辨率广义S变换、多分辨率双曲S变换、基于布莱克曼窗与窗宽比S变换以及基于凯泽窗与频变参数S变换的时频分辨率进行了对比分析。在提高电压中断、暂降、暂升、暂降等暂态扰动分析精度方面,发现相较于改变窗口参数,改变窗口类型可以更加明显地提高S变换的时域分辨率。在提高高次谐波与暂态振荡等高频扰动分析精度方面,发现相较于多分辨率的方法,变换窗宽控制方式可以更加明显地提高S变换的频域分辨率。通过仿真实验定量分析,改进窗口类型与窗口控制方式的基于凯泽窗S变换在分析暂态扰动与高频扰动的时频分辨率方面优势最为明显,可以给电能质量扰动分析应用提供一定指导。In order to improve the analysis accuracy of transient disturbances and high-frequency disturbances in new energy power systems,the paper compares and analysis time-frequency resolution among generalized S transform,multi-resolution generalized S transform,multi-resolution hyperbolic S transform,based on Blackman window and window Aspect ratio S transform and based on Kaiser window and frequency variable parameter S transform.In improving the accuracy of transient disturbance analysis such as voltage interruption,it is found that compared to changing the window parameters,changing the window type can more significantly improve the time-domain resolution of the S transform.In terms of improving the accuracy of high-frequency disturbance analysis such as high-order harmonics,it is found that compared with the multi-resolution method,the conversion window width control method can significantly improve the frequency domain resolution of the S transform.Through the quantitative analysis of simulation experiments,the Kaiser window S transform based on the improved window type and window control method has the most obvious advantage in the analysis of transient disturbances and high-frequency disturbances in time-frequency resolution,which can provide certain guidance for the application of power quality disturbance analysis.

关 键 词：S变换 窗口参数 窗口类型 时频分辨率 窗口控制 

分 类 号：TM933[电气工程—电力电子与电力传动] TM712