Harmonic suppression methods for different types of electric vehicle charging stations
CHEN Ding1, QIU Qun hui1, YANG Xiao dong2, WANG Jian2, HE Ping1, JIN Yu qiao1, ZHANG You bing2
(1.State Grid Jiaxing Municipal Electric Power Company, Jiaxing 314100, China;
2.College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China)

Abstract: Auning at the problems of harmonic currents generated by different electric charging station, the methods of harmonic suppression for different types of electric vehicle charging stations were studied. Firstly, the causes of the harmonics of the electric vehicle charging station were analyzed. Then, the harmonic of main vehicle charger and non vehicle charger were simulated and analyzed, and the harmonic characteristics of the non vehicle chargers with high harmonic content were studied. Active rectification of rectifying link and centralized control of adding filter was put forward to solve the harmonic problem of non vehicle charger.The performance of increase the number of uncontrolled rectification pulse, the use of PWM rectifier active control and the use of shunt active power filter device for centralized management was evaluated through the simulation. Comparing harmonic control effect of several methods in the simulation, the experiments were made on this load with the parallel active power filter had good control effect. The results indicate that the shunt active filter can detect harmonic current changes of electric vehicle charging station in real time and outputs the compensation current to track the detected reference current. When the harmonic current of the charging station mutates, the shant active power filter can complete compensation with in several operating frequency cycles. The content of harmonic can be reduced to 2.73%, the highest content of each harmonic is only 0.69%, and content of harmonic is effectively reduced to the national standard.

Key words: harmonic of electric vehicle charging station ;car charger; non car charger; active governance; centralized governance; shunt active power filter