Evaluation of the Energy Quality of a 2 MWp Photovoltaic Power Plant Integrated into the Distribution Network: Revision of the EN50160 Standard on Total Harmonic Distortion and Voltage Variations

With the increasing integration of renewable energy sources into the distribution network and the growing complexity of modern power grids, electricity quality has become a major concern. This paper analyzes the performance of a 2 MWp photovoltaic power plant connected to a 22 kV distribution grid, focusing on Total Harmonic Distortion (THD) and voltage unbalances, including homopolar and inverse components. Measurements taken during critical periods, particularly at sunrise and sunset, highlight the need to review energy quality parameters over time intervals shorter than ten minutes to better detect and understand significant deviations, especially in grids with high renewable energy integration. This study highlights the shortcomings of existing standards and proposes revisions to better ad-dress the challenges posed by renewable energy integration. The recommendations aim to improve electricity quality assessment and ensure optimal compatibility with contemporary and future technologies.