Harmonic Analysis of the Interactions between PV Systems and EV Charging Stations

Abstract

There is global potential for expanding the adoption of electric vehicles (EV) and photovoltaic (PV) systems. This inquiry raises the question of how PV and EV charging stations interact when connected to the same bus. This paper presents an investigation in both the total harmonics distortion (THD) and total demand distortion (TDD) of the current at the common coupling point based on PV/EV charging stations ratio. The variety of the ratio between the current drawn from the PV system and the charging EV current has been presented. Accordingly, the maximum PV hosting capacity is identified based on the maximum values of THD and TDD. The case study represents the EV charging station with three phase uncontrolled front-end rectifier and DC-DC choppers. It is implemented using the MATLAB software environment. The results indicate that an increase in the PV system capacity integrated with the EV charging station leads to higher levels of both THD and TDD, potentially resulting in violations of international standards. However, when the PV-to-EV charging station capacity ratio exceeds 1.9, a declining trend in THD and TDD values is observed, respectively.