摘要
结合电能稳态和暂态的分析方法,提出了对两者的混合扰动的检测。短时傅里叶变换(STFT)提出了加短时窗的思想,小波变换改进了STFT窗口宽度固定的缺陷,S变换改进了小波变换窗口面积固定,不能提取任意频次成分的缺点。并对比分析了这三种时频分析法对电压暂降与谐波混合的信号的检测结果,随着学术思想的进步,检测结果更加精确。
Combined with the analysis method of electric energy and transient state, the detection of mixed disturbance is proposed. The short-time Fourier transform （STFT） is proposed to add short time window; Wavelet transform improves the STFT＇s window width and fixed the defect; S transform is an improvement of wavelet transform which improves the window area of the wavelet transform and can extract any frequency components. And the detection results of the three time-frequency methods are compared and analyzed. Along with the progress of the academic thought, the test result is more accurate.
出处
《电子设计工程》
2016年第22期53-56,共4页
Electronic Design Engineering
基金
陕西省科技厅工业科技攻关项目(2015GY075)
关键词
混合扰动
短时傅里叶变换
小波变换
S变换
mixed disturbance
short-time Fourier transform
wavelet transform
S transform
