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 .
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 transforms. 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 to 1 in the well-balanced duration, while the adjusting amplitudes are equal to the ratio of vol- tage amplitude in the well-balanced 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 magnitude of voltage.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第11期6-9,14,共5页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目 (5 0 0 770 0 8)
广东省自然科学基金资助项目 (0 330 4 4 )
关键词
小波变换
信号检测
电能质量
wavelet transform
signal detection
power quality
