Layered Service Scheme For Electric Vehicle Charging System

Renewable energy and Electric Vehicle(EV) are the solutions of energy conservation and emission reduction in smart grid. Because of the intermittence of renewable energy and the uncertainty of the EV charging demand, it is difficult to integrate renewable energy into the grid to serve EVs. In order to fully mobilize the following characteristics and dynamic cooperation of renewable energy and EV demand, we propose a layered power service framework. Different layers correspond to different charging service quality. and a long-term optimization problem is formulated to optimize power distribution of each layer. By using Lyapunov optimization algorithm, we transform the long-term problems into a series of linear sub problems facing each time slot. The simulation results show that our layered service algorithm can realize layered service and effectively reduce system operation cost.