COMPARISON OF DIFFERENT PARAMETERS FOR THE ANALYSIS OF ELECTRICAL POWER SYSTEMS UNDER NONSINUSOIDAL CONDITIONS

摘要

In modern power systems the hypothesis of pure sinusoidal waveforms is less and less realistic. The removal of this hypothesis has both theoretical and practical consequences. Some classical electrical quantities lose their physical meaning and do not provide useful information. On the other hand, new parameters may be introduced in order to characterize a system under nonsinusoidal conditions. A relevant feature of such parameters should consist in the measurement of the non-fundamental power and in the evaluation of the distortion introduced by loads. This paper presents analytical and experimental considerations about classical and new parameters suitable for the analysis of nonsinusoidal systems. Some tools like Fault Function, Amplitude Harmonic Distortion, Distortion Power and Instantaneous Power Harmonics are proposed in this paper for the first time. The considered parameters may be divided in two general classes: single-harmonic based parameters and global parameters.