Voltage Fluctuation and Flicker Monitoring System Using LabVIEW and Wavelet Transform

The paper puts forward a method which uses wavelet multi-resolution analysis to extract characteristics of voltage flicker, establishes the arithmetic model of voltage fluctuation and flicker, and it can detect the amplitude modulation waveform of the voltage flicker, and examine abrupt-change time, frequency, and amplitude of the amplitude modulation waveform. A voltage fluctuation and flicker monitoring system based on virtual instrument was developed, where the wavelet transform was applied to virtual instrument by using the MATLAB script node in LabVIEW. The evaluation indices of short-term flicker severity were obtained by using statistic sorting algorithms. Sensation level weighted filter, Square multiplier and first order low pass filter were designed.