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用小波分析提取电压闪变的幅值调制信号 被引量:17

Tracking the Envelope of Voltage Flicker Using Wavelet Analysis
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摘要 正确评价闪变污染程度并进行有效治理需要计算电压闪变的幅值调制信号。传统的检测法用FFT算法分析稳态调幅波,不能分析幅值时变的闪变信号。小波变换能够提取时变的调幅波,但已有的方法需要(拟)同步信号,在电压信号存在其它波形干扰时会引入较大误差。文中提出了一种直接利用采样电压信号,基于周期小波变换的闪变电压包络线检测方法。经过仿真算例验证,这种方法误差小、适应性强,能满足工程应用要求。 The accuracy of tracking the envelope of voltage signal has a great effect on the flicker measurement and the efficiency of voltage flicker mitigation. Conventional Fourier transform based detection method, such as squared method suggested by IEC, can't extract the time-varying envelope of voltage flicker. Being suitable for analyzing the non steady voltage envelope, newer wavelet based algorithm will bring errors if either imprecise synchronizing signal or simulating synchronizing signal is used in the condition of a bit of transients presented. A new method is proposed in this paper which demodulates the voltage signal directly and extracts the envelope of vohage flicker using wavelet transform. Its validity and applicability are evaluated with examples of different cases.
出处 《电力系统及其自动化学报》 CSCD 北大核心 2006年第3期34-37,共4页 Proceedings of the CSU-EPSA
基金 江苏省教育厅自然科学研究项目(03KJB470104) 南通大学自然科学研究项目<电力系统电能质量在线评估系统的研制>
关键词 电压闪变 小波分析 电能质量 信号分析 检测 voltage flicker wavelet transform power quality signal analysis detection
作者简介 堵俊(1958-),男,副教授,主要从事信号检测、信号及系统分析方面的研究及教学工作。Email:Du.j@ntu.edu.cn 邵振国(1970-),男,讲师,博士,主要从事电能质量分析以及电力系统稳定性研究。Email:shao.zg@ntu.edu.cn 郭晓丽(1972-),讲师,硕士,从事电能质量、远动技术方面的研究。Email:guo.xl@ntu.edu.cn
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参考文献10

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