Measurement of voltage flicker magnitude and frequency in a power system for power quality analysis

One must be able to accurately measure voltage flicker levels and its frequ ency. This paper introduces a new application of the least error squares (L ES) state estimation algorithm to measure voltage flicker and its frequency . We use a linear model of the flicker voltage magnitude, its phase angle a nd frequency deviation, and the system voltage magnitude and its phase angl e. The proposed algorithm uses digitized samples of the voltage signal. Eff ects of data size, sampling frequency, and number of samples on the estimat ed parameters are studied.