Studies On The Impacts Of Large-scale Electric Vehicles Charging On The Power Distribution Network And Coordinated Charging

With the growing of lots of electiric vehicles connecting to the power distribution network, there will be profound impact to the distribution network. This paper carring out the related research is based on this background and project requirements.First, this paper discusses the influence factores of charging load by EVs, and it analyzes the EVs holding of Beijing in future, charging characteristic of power battery, and driving characteristics of users in our country. Meanwhile, it introduces the method of calculating charging load-based on the Monte Carlo Method simulate calculate. And then explain the main feature of Monte Carlo Method, and introduce the flow of this method, in the last, it give an example to testify this method. All these lay the root for post-sutdy.Then, this paper gets some data about total load curve through the simulation calculation. Based on these result, it analyzes the TMDL; valley-to-peak; the impact to the spare capacity, then it does the same analysis after considering a few of fast charging with large-capacity. The consequence indicates the fast charging must be controlled. In the next section, it set up a structure chart of distribution network, and through this, it studies the voltage excursion of nodes; load factor of transformer and lines. It gives the reliable advises for the development of distribution network construction.Finaly, in order to reduce impact to the distribution network by charging load, this paper comes up with control objectives to meet the users and grid in the same time. This objective can ensure the load peak not rise to high, and transfer the charging load to the teough time, therefore it can peak load shifting. But its premise is satifing the user’s charging demand. And it getes them by controlling variance and valley-to-peak of overalload be minimum. The simulation result indicates that this coordinated charging method would transfer the charging load and reduce impact to the distribution network by a large margin than uncoordinated charging.