Improvement of Power Quality Index in Distributed Power System Networks

Abstract

This project proposed the new distortion power quality index to replace the previously proposed index. Its computation was carried out based on the load composition rate (LCR) and Euclidean norm of total harmonic distortions (THDs) of the measured voltage and current waveforms at the point of common coupling (PCC). Based on the proposed PQI, the harmonic pollution ranking, which indicates how much negative effect each nonlinear load has on the point of common coupling (PCC) with respect to distortion power, is determined. Time-domain simulations are carried out to prove the effectiveness of the proposed PQI under the other conditions with different nonlinear loads.
Keywords—Distortion power; distribution power system; Euclidean norm; harmonic pollution ranking; power quality index; reduced multivariate polynomial (RMP) model