快速s变换在电能质量分析中的应用 application of fast s-transform in power quality analysis.pdfVIP

37 卷 5 期 电 网 技 术 Vol. 37 No. 5 2013 年5 月 Power System Technology May 2013 文章编号：1000-3673 （2013 ）05-1285-06 中图分类号：TM 72 文献标志码：A 学科代码：470.4051 快速S 变换在电能质量分析中的应用 张志禹，满蔚仕，郗垒，黄璐瑶 （西安理工大学自动化学院，陕西省 西安市 710048 ） Application of Fast S-Transform in Power Quality Analysis ZHANG Zhiyu, MAN Weishi, XI Lei, HUANG Luyao (School of Automation, Xi an University of Technology, Xi an 710048, Shaanxi Province, China) ABSTRACT: S transform is a time-frequency transform with 质量问题，人们一直以来应用某种数学方法从PQD adaptive resolution, which is widely used in analyzing the 信号中提取特征量，依据这个特征量对扰动信号进 power quality recently. However ，the traditional S transform is 行分类和识别。这些数学分析方法包括：快速傅里 very computation-intensive( O( N 3 ) time complexity) and 叶变换(fast Fourier transform ，FFT) 、小波变换 difficult to meet the real-time requirements. A new fast S transform (FST) algorithm ( O(N log N ) time complexity) is (wavelet transform，WT) 、短时傅里叶变换(short time introduced to analyze the power quality, which can differentiate Fourier transform，STFT) 、S 变换(S-transform ，ST) the different voltage disturbances in the FST domain, and [2-5] 和高阶累积量 。 denoise the voltage disturbances. Compared with the traditional [6] Stockwell 等 提出 S 变换，它是在 STFT 和 S-transform in terms of efficiency, simulation results show that WT 的基础上发展而来的，后出现了离散正交的 S the different voltage disturbances have different coefficient [7] 变换(discrete orthonormal S-transform，DOST) 。 manifestations in the FST domain, and th