华南理工大学学报(自然科学版) ›› 2004, Vol. 32 ›› Issue (11): 6-9,14.

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基于小波变换的电能质量扰动测量方法

朱锋峰1 任震2 胡国胜2
  

  1. 1.华南理工大学 数学科学学院‚广东 广州510640;2.华南理工大学 电力学院‚广东 广州510640
  • 收稿日期:2003-11-05 出版日期:2004-11-20 发布日期:2015-09-08
  • 通信作者: 朱锋峰(1963-)‚女‚副教授‚主要从事数理统计和小波分析的应用研究。 E-mail:zhuffeng@163.com
  • 作者简介:朱锋峰(1963-)‚女‚副教授‚主要从事数理统计和小波分析的应用研究。
  • 基金资助:
    国家自然科学基金资助项目(50077008);广东 省自然科学基金资助项目(033044)

Measurement of Power Quality Disturbance Based on Wavelet Transform

Zhu Feng- feng1  Ren Zhen  Hu2 Guo- sheng1   

  1. 1.College of Mathematical Sciences‚South China Univ.of Tech.‚Guangzhou510640‚Guangdong‚China;
    2.College of Electric Power‚South China Univ.of Tech.‚Guangzhou510640‚Guangdong‚China

  • Received:2003-11-05 Online:2004-11-20 Published:2015-09-08
  • Contact: 朱锋峰(1963-)‚女‚副教授‚主要从事数理统计和小波分析的应用研究。 E-mail:zhuffeng@163.com
  • About author:朱锋峰(1963-)‚女‚副教授‚主要从事数理统计和小波分析的应用研究。
  • Supported by:

摘要: 对电压幅值变化现象的定量检测问题进行了研究.定义了基于两个实值小波归一变换的幅值及调整幅值的概念.证明了只要这两个实值小波函数一个为偶函数、一个为奇函数并满足一定的条件‚则基于这两个实值小波归一变换的调整幅值在非故障区间内的值恰好等于1‚而在故障区间内的值恰好等于故障区间的电压幅值与非故障区间的电压幅值之比.最后选用两个实值小波函数‚应用基于这两个实值小波归一变换的调整幅值对电压波形畸变进行了检测‚模拟结果显示该幅值检测图不仅能准确定位故障发生和终止时刻‚而且可精确地定量显示出电压变化的幅度。

关键词: 小波变换, 信号检测, 电能质量

Abstract:  The quantificational detection for the change of voltage amplitude was investigated in this paper.First‚two conceptions were defined‚that is‚the amplitude and adjusting amplitude based on two real wavelet standard trans-forms.Next‚it was proved that‚if the two real wavelets meet some conditions‚and one is an even function and the other is an odd one‚the adjusting amplitudes based on the two real wavelet standard transforms are always equal to1in the wel- l balanced duration‚while the adjusting amplitudes are equal to the ratio of vo- l tage amplitude in the wel- lbalanced duration to that in the disturbance duration.Finally‚the adjusting amplitudes of two selected real wavelets were used to detect the voltage waveform aberrance.Simulated results show that the novel amplitude detection figures can not only find accurately out the start point and stop point of faults but also quantitatively display the changing mag-nitude of voltage.

Key words:  wavelet transform, signal detection, power quality

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