Research On V2G Security Authentication Technology Based On Blockchain

In recent years,with the promotion and implementation of the national "double carbon" policy,China’s green and low-carbon energy transition has been progressing rapidly,with the construction of a new power system dominated by new energy sources accelerating and the new energy vehicle industry flourishing.However,when largescale electric vehicles are connected to the grid for disorderly charging,it will affect the safe and stable operation of the grid.Vehicle to Grid(V2G)technology enables bidirectional interaction of energy and data between EVs and the grid under the unified scheduling and control of the grid,alleviating the negative impact of the large number of EVs connected to the grid.The interaction between EVs and the grid cannot be achieved without the support of information and communication systems,however,the extensive use of information and communication technologies in V2G networks can bring about a series of security issues.Therefore,secure authentication between entities in V2G is a prerequisite for safeguarding user privacy and energy transaction security.Most of the current security certification schemes based on traditional Public Key Infrastructure(PKI)technology have problems such as single point of failure,complex certificate management and difficulties in mutual trust between multiple Certificate Authorities(CA).Blockchain technology,which has attracted much attention recently,can provide a feasible solution with its decentralization and tamper-evident characteristics.Therefore,this paper proposes a blockchain-based V2G security authentication scheme.Firstly,a system architecture based on blockchain technology is designed under the framework of a hierarchical distributed control approach,and the security requirements of the system are analysed.Secondly,to address the security problems of the system,a distributed security authentication scheme is proposed from both the intra-domain and extra-domain perspectives using smart contracts,elliptic curve digital signature algorithms and public key certificates,and automates the registration,query and revocation of user public keys,effectively guaranteeing the security of user public keys.At the same time,it realises cross-domain authentication with the help of blockchain technology,which is a good solution to the shortcomings of traditional PKI technology.Finally,the security and performance of the proposed scheme are evaluated.The results show that the proposed scheme meets the security requirements of V2G,and the security,effectiveness and feasibility of the scheme are verified through system simulation.