Research on the harmonic characteristics of electric vehicle fast charging stations

This paper analyzes the working principle and electrical structure of the fast chargers, chooses typical fast charging stations based on the capacity of regional power grid, and measures the harmonic of different fast chargers. The test data of different power sizes is analyzed, and the difference between the measured and the theoretical value is compared. Then, the harmonic current of the multistage charging machine working simultaneously is measured, and the relation between the harmonic current size with the electric car and the fast charging pile is studied. Based on the measured data, this paper studies the characteristics and scope of harmonic in view of different electrical parameters and determines scope of efficiency and power factor, and compare the result with the related standard, then evaluates the influence of the fast charging station of the grid.