Abstract
Time-varying voltage flicker caused by non-linear and fluctuating loads have adverse impact on the power grid and lighting equipment. This paper proposes a time-varying voltage flicker analysis method based on analytic-adaptive variational mode decomposition (AAVMD). A novel improved square demodulation method based on analytic mode decomposition (AMD), is proposed to quickly extract the time-varying flicker envelope signals, which simplify the computational process of voltage flicker without the analog filter. Then, the adaptive variational mode decomposition (AVMD), using the energy loss coefficient and energy difference as a criterion for determining the number of modal decompositions, is proposed to detect the time-varying voltage flicker envelope which effectively avoids the pattern confusion problem of Hilbert-Huang transform (HHT). The accuracy and validity of the proposed method are demonstrated in a National Instrument-PXI system under the conditions of single frequency flicker modulation, time-varying flicker modulation magnitude, multi-frequency flicker modulation, fundamental frequency deviation and white noise interference.
Published Version
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