TIME DOMAIN ESTIMATION TECHNIQUES FOR HARMONIC LOAD MODELS

ABSTRACT In this paper we present two novel time domain techniques for load modelling in the presence of harmonics. In the first technique, the harmonic contents of the load voltage and current waveforms are assumed to be known in advance. The second technique uses samples of the load voltage and current waveforms directly. The least errors square parameter estimation algorithm is used to estimate the load resistance, inductance and capacitance. The residual current associated with incomplete extraction of the parameters for all significant signal frequencies is also estimated. We also identify harmonics that are not common between the load voltage and current waveforms. The proposed techniques are applied to synthetic and actual recorded data. The paper's conclusions are based on comparing the results obtained using both techniques.