Abstract

The cumalant-based RLS algorithm with variable forgetting factor is introduced in this paper as effective approach for tracking the voltage flicker envelope. The improved RLS algorithm uses the fourth-order cumulant-based mean-squared-error (MSE) criterion in place of correlation-based MSE criterion, in order to suppress the Gaussian noise. For tracking nonstationary voltage flicker waveform, variable forgetting factor (VFF) can be applied to adjust the tracking performance and convergence performance of algorithm. Two cases of flicker with constant amplitude and frequency and varying amplitude and frequency are used to verify the performance of algorithm.

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