ROBUST AND RAPID ESTIMATION OF THE PARAMETERS OF HARMONIC SIGNALS IN THREE PHASE POWER SYSTEMS

We present a novel algorithm for rapid and efficient estimation of the fundamental frequency, phase and amplitude of harmonically distorted signals in balanced three-phase (3PH) power systems. The proposed algorithm exploits the harmonic structure of the signal to enhance the quality of the parameter estimates. It operates in the frequency domain, employing an efficient iterative interpolation procedure on the Fourier coefficients. The estimator has a low computational complexity, being of the same order as the fast Fourier transform (FFT) algorithm. Yet, it outperforms state-of-art high resolution parameter estimators for 3PH power system signals, especially when the available data points are limited and/or the signal to noise ratio is poor.