Research On Electricity Transaction And Security Algorithm Of Microgrid Day-ahead Market Based On Consortium Blockchain

As a new form of smart grid,microgrid has received a lot of attention in recent years.The electricity in the microgrid can not only be consumed nearby through trading,but also reduce the loss of long-distance electricity transmission.The microgrid’s trading mechanism is mainly focused on the day-ahead market due to its characteristics of producing electricity.Since the transaction data of microgrid is more sensitive,the transaction process of its day-ahead market must not only ensure the authenticity and trustworthiness of the transaction parties but also create a fair,safe,and reliable transaction environment.A scheme for electricity trading in the microgrid day-ahead market based on the consortium blockchain is designed in this paper,while a corresponding privacy protection scheme is proposed to ensure the security of the transaction,which works as follows:Firstly,aiming at the problems faced by buyers and sellers in the traditional centralized trading mode in the day-ahead market of microgrid,such as higher operating costs,lower operating efficiency,impermeable trading data and trading rules,and easy to lead to the leakage of users’ personal privacy,an electricity trading scheme based on the consortium blockchain is constructed in this paper.In this scheme buyers and sellers trade electrical energy according to a pre-agreed smart contract,and pack their transaction results into blocks,which are consensuses among pre-selected nodes through practical Byzantine fault tolerance and finally connected to the blockchain.Secondly,to reduce the impact of certificateless signcryption on the speed of electricity trading in the microgrid day-ahead market,this paper improves the existing certificateless signcryption scheme and designs a certificateless signcryption scheme without bilinear pairs.The scheme is constructed based on the discrete logarithm problem of elliptic curve,and only the point product operation on the elliptic curve is used,which reduces the computational cost in the two stages of signcryption and unsigncryption.In addition,the confidentiality and unforgeability of the scheme are proved by the random language model,and the high efficiency of the scheme is demonstrated by comparing the computation time with other certificateless signcryption schemes.Finally,a privacy protection scheme for microgrid day-ahead market based on consortium blockchain is proposed to solve the problem that the leakage of electricity consumption information threatens the privacy and security of customers and the leakage of electricity trading plans undermines the fairness of the day-ahead market.The scheme uses an improved certificateless signcryption to authenticate and encrypt the electricity trading plan of both buyers and sellers while generating anonymous identities for the users involved in the transactions based on the El Gamal algorithm to prevent leakage of electricity consumption information.In addition,since the keys are generated jointly by the user and the key generation center in this scheme,it makes it unnecessary for the user to request additional transaction credentials in the transaction,thus improving the throughput of the transaction.