Research On Information Security Authentication In The Electric Vehicle Smart Charging

Smart grid supports and encourages integration of new energy power generation system,but because of the discontinuity and randomness,new energy will cause the fluctuation of power grid,so in order to smooth the fluctuations and ensure the stability of power grid voltage and frequency,smart grid need other auxiliary system as a compensation of new energy system.Electric Vehicle(EV)is considered as a new distributed energy resource and has a dual characteristic of controllable load and mobile energy storage unit.But because of its uncertainty in charging time,charging position and charging behavior,letting people recharge EVs in a disordered manner could pose a serious threat to the safe and economic operation of power grid,so it is imperative to realize smart charging of EVs.The technology of vehicle to grid(V2G)can realize energy integration and information integration between EVs and power grid,when the power load is high,EVs can feedback the surplus electricity to the power grid,and when the load is low,a large number of EVs battery pack can be used to store excess power grid electricity.V2 G networks can realize smart charging of EVs and provide service of rapid storage and release of electricity for power grid,but it also suffers from certain security and privacy threats.This paper focuses on information security problem in V2 G.Firstly,we introduce implementations of vehicle to grid,and on the basis of analyzing their advantages and disadvantages,we build a V2 G control system structure on the basis of aggregators,and analyze its information and communication networks and existing security problems.Then in view of existing security threats and EVs' dynamic joining and revocation,we propose an anonymous group authentication scheme based on group signature for V2 G communications.Besides,we introduce a batch authentication way which can reduce authentication delay when large-scale EVs connect to the power grid.Through safety analysis and efficiency analysis,this scheme can realize dynamic joining and revocation of EVs,and greatly reduce the overhead of EV revocation,and ensure identity authentication of EVs user and security of data transmission in the process of charging.Finally,the program simulation results show that the scheme can meet requirements of security communications in the electric vehicle smart charging control system.