Comparison of results in the estimated Norton equivalent model with measurements within the limits of distortion on IEEE 519 and EN 50160

This article makes a comparison of the results obtained for the estimation of currents by means of Norton's equivalent model. This comparison is made when the model is calculated from voltage and current measurements made in a controlled environment, which meet the voltage distortion limits proposed by the standards IEEE 519 and EN 50160 for three non-linear residential loads. The comparison is carried out in eight different evaluation scenarios, two by means of synthetic signals and six by means of signals obtained in the laboratory. In all scenarios is estimate the total harmonic distortion, the form factor and the correlation coefficient of the estimated current signals with the obtained using the measured signals. This study refers to the role played by the operating zone of the voltage signals in the calculation of the Norton equivalent model and the estimated current showing differences when this is calculated with signal voltage into the limits proposed by the IEEE 519 and EN 50160 standards. These differences in the total harmonic distortion, the form factor and the correlation coefficient, with respect to the measurements obtained in the laboratory, are of the order of 41 %, 75 % and 0.58 %, respectively for the signals obtained by complying with the IEEE 519 standards and those of 41 %, 75 % and 0.58 %, respectively for the signals obtained by complying with the limits of standard EN 50160.