HARMONIC CURRENTS ANALYSIS OF A 15 KW SINGLE PHASE ROOFTOP SOLAR POWER IN FUNCTION OF SOLAR IRRADIANCE AND PANEL TEMPERATURE IN VIETNAM

Abstract

This paper presents a study on the harmonic analysis of a 15 kW single-phase rooftop solar system under varying solar irradiance and photovoltaic (PV) panel temperature conditions. The simulation model is developed based on a Maximum Power Point Tracking (MPPT) algorithm employing the Perturb and Observe (P&O) method, integrated with a proportional-resonant (PR) controller. Harmonic distortion is evaluated across different operating scenarios influenced by changes in irradiance and panel temperature. The computed harmonic levels are then compared against the current regulatory limits on current harmonics as specified in Circular No. 05/2025/TT-BCT, dated February 1, 2025, issued by the Ministry of Industry and Trade: Regulations on Power Transmission, Distribution, and Energy Metering Systems. Based on the analysis, several recommendations are proposed to enhance compliance and system performance