Power Quality Assessment Procedure for Hybrid Renewable Systems

The increasing penetration of renewable energy sources has introduced variability in power system parameters, particularly affecting low-voltage grids and leading to heightened power quality concerns. This paper proposes and presents a systematic procedure designed to evaluate and predict the behavior of hybrid electricity generation installations. Using a case study of a 25-kW photovoltaic-diesel-grid hybrid system, the initial three steps—data acquisition, preprocessing, descriptive analysis, and anomaly detection—are demonstrated through statistical analyses, visual data examination, and anomaly identification. Results underscore consistently low voltage Total Harmonic Distortion (THD) values below 2%, juxtaposed against significantly more variable current THD, indicative of nonlinear load behavior and diesel generator influence.