Model establishment and harmonic analysis of electric vehicle charger

At present, energy conservation and environmental protection has become a global concern. The characteristics of “zero emission” of electric vehicles make it vigorously popularized in all countries in the world in recent years. For the problem of serious harmonic pollution on the grid side caused by increasing electric vehicle charging station, a complete charger model is established in this paper. First of all, the characteristics of a single charger to produce harmonics are studied. Then, the Matlab/Simulink platform is used to simulate several charging machines at the same time. Finally, the simulation results are compared with the theoretical analysis. Harmonic characteristics and influence of number of chargers on the harmonic content is analyzed. The simulation results show that partial damping phenomenon will appear on the same harmonics of different harmonic sources which neutralize each other, the harmonic distortion rate will decline when several chargers works. The reasonable basis for the harmonic suppression of the charger can be provided by this paper.