Research On Direct Power Purchase Transaction And Security Algorithm For Large Consumers Based On Blockchain

With the development of Energy Internet,the transaction mode of direct power purchase by large consumers has changed from ‘one-to-one’ bilateral negotiations to‘multi-to-multi’ platform transactions,and the scale of direct power purchase has also expanded year by year.Due to the problem of data sensitivity in direct power purchase transactions,the transaction process should meet the requirements of authenticity,reliability,and real-time delivery.Power generators and large consumers carry out direct power purchase transactions through the blockchain,which can not only satisfy distributed multi-point transactions,but also meet the basic requirements of direct power purchase transactions.However,there are very few related researches on the application of blockchain to direct power purchase by large consumers.This paper proposes a system for direct power purchase by large consumers based on the consortium blockchain,and conducts research on the overall framework design of the direct power purchase,the transaction mode between power generators and large consumers and the privacy protection in the process of direct power purchase.The specific work is as follows:First of all,in view of the problems of distrust between transaction subjects and central organization,cumbersome transaction process,low efficiency and low data security coefficient existing in direct power purchase transactions.This paper builds a system for decentralized direct power purchase based on consortium blockchain.From the information dimension,the problems of trust,data leakage,data l oss and data tampering that exist in the current direct power purchase transactions are solved.From the physical dimension,the energy aggregators agent nodes are used to operate to solve the problem of physical access to direct power purchase.Experimental simulation proves that this model has lower energy consumption cost.Secondly,in view of the existing problems of direct power purchase transaction mode,such as inflexibility,unclear market signals and low freedom of market choice,this paper proposes a mode for direct power purchase by large consumers based on reputation value and the Stackelberg game.The model uses the reputation value as a positive indicator to evaluate the enthusiasm of the node.Power generators act as leaders and large users as followers,realizing a "multi-to-multi" distributed direct power purchase transactions.Compared with the existing trading mode,the price signal can be more fully used to guide the market competition and give higher freedom to both sides of the transactions.The experimental results show that the model proposed can reduce the power purchase cost of large consumers by 15.35%on average,which is beneficial to the planned production of power ge nerators,expand market share and increase revenue.Finally,in view of the problem of excessively high information disclosure in the application of blockchain to direct power purchase by large consumers,this paper proposes a privacy protection scheme suitable for the proposed model.The pseudo-identity information and ring signcryption formed by the multi ple keys ensure the security of transaction data in the process of bill confirmation,data forwarding,node consensus,identity traceability and the privacy of user identity.Through mathematical analysis,it is proved that the privacy protection scheme is correct and has the characteristics of verifiability,anonymity,confidentiality,unforgeability and traceability.Through performance analysis,it is proved that the privacy protection scheme proposed in this paper has lower computational compared with the existing schemes.