Analysis of electric vehicles' impact to the electric grid

The electric vehicles are the inevitable outcome of the energy development, and are also the important part of distributed energy sources in the smart power grids, so now it has been the extensive attention and developed by the society. In the power system, electric vehicle charging post is the nonlinear load, and most of all are the inverter models which consist of power electronic devices. With a large number of electric vehicles access, the charging post will develop harmonic wave to influence the power distribution network in the electrical energy conversion process. This paper introduces the prospect of the electric vehicles based on the social influence and power quality, and expounds the advantages and disadvantages. At the same time, by building the model of the electric vehicles with the actual parameters, this paper analyses the electric vehicle's impact to grid harmonic and reactive power, and put forward the solutions and advices to reduce the impact of electric vehicles. The simulation results show that, the electric vehicles charging post model will inject much harmonic current to improve the current aberrations rate. After filtering, odd harmonic decrease obviously, and the power factor and the power quality are improved.