Research On Voltage Flicker Detection And Flicker Source Identification

Voltage fluctuation and flicker is an important aspect of power quality. Taking effective measurements of voltage fluctuation and find out the flicker source are significant to the compensation of voltage fluctuation. This paper analyzed the measurement performance of Teager energy operator, Hilbert transform and square demodulation of flicker without harmonics and with harmonics. After extracting the flicker envelope, the flicker frequency and amplitude error, and short-term flicker severity Ps t error are calculated. Besides the fractal dimension of RMS load voltage and current is presented as the characteristic parameter to tell the difference between the flicker source and non-flicker source. The simulation data by PSCAD and field data show the accuracy of the theory. Finally the flicker detection and source identification system is established by vitual instrument LabVIEW. By setting the input parameters and choosing the way of estimation threshold, the flicker source can be located correctly, and the flicker components and modulation factors can be calculated.