Estimation of the Utility's and Consumer's Contribution to Harmonic Distortion

A method has been presented for the allocation of responsibilities between a utility and a consumer with reference to the distortion of 3-phase voltage waveforms at the point of common coupling. The input data required for applying this method are the measured voltage and current waveforms at the point of common coupling. The frequencies in the measured waveforms are estimated and a Kalman filter is used to estimate the phasors at these frequencies. Subsequently, the parameters of the electrical system of the industrial load have been estimated using the recursive least-squares technique. With these estimated data, the individual contributions to the distortion of the 3-phase voltage waveforms have been calculated. The proposed method has been illustrated by means of a practical example.