Harmonic Analysis of EV Charging Station Based on Measured Data

As a non-linear random load, electric vehicle (EV) charging piles will cause a series of power quality problems in the distribution network. Therefore, it is of great practical significance to study the impact of harmonics generated during EV charging. First, based on the electrochemical theory of battery charging, the working principle of EV charging stations is described in detail. Then, the mechanism of harmonic generation in EV charging process, which is the theoretical basis for modeling the harmonic source of electric vehicle charging piles, is analyzed and introduced based on the existing charging methods. A simplified processing method of DC/DC power converter is proposed, and an equivalent nonlinear resistance model based on the state of charge of the battery is established. At last, the charging harmonics of EV are analyzed based on the measured data.