Measurement of Voltage Flicker Magnitude and Frequency in a Power System For Power Quality Analysis

Abstract

One must be able to accurately measure voltage flicker levels and its frequency. This paper introduces a new application of the least error squares (LES) state estimation algorithm to measure voltage flicker and its frequency. We use a linear model of the flicker voltage magnitude, its phase angle and frequency deviation, and the system voltage magnitude and its phase angle. The proposed algorithm uses digitized samples of the voltage signal. Effects of data size, sampling frequency, and number of samples on the estimated parameters are studied.