Research On Microgrid Terminal Authentication And Power Trading Mechanism Based On Blockchain

As the global energy crisis and environmental pollution become more and more serious,the power system structure transforms from traditional fossil energy to new energy,which makes microgrid and distributed power generation develop rapidly.However,the access of massive terminal devices in microgrid makes it difficult to manage,and also brings huge security risks.At the same time,under the promotion of national policies,although the direct trading of distributed power generation has been liberalized,it still needs to rely on the centralized power trading platform,which cannot make the trading process open and transparent,and also increases the risk of attack.Therefore,it is urgent to explore the terminal authentication and power trading of microgrid,and strive to achieve a safe,effective and open terminal authentication and power trading mechanism.This thesis takes microgrid as the main research object,and constructs a distributed terminal authentication system and double-layer power trading mechanism based on blockchain.Firstly,this thesis analyzes the current development status of blockchain technology and builds a blockchain network that fits the microgrid scenario.From the aspects of blockchain architecture,consensus mechanism and smart contract,it gives a comprehensive exposition of blockchain technology,and deeply analyzes the key technologies,core functions and typical scenarios of blockchain.In addition,considering the actual operation scenario of microgrid,this thesis reformed the typical blockchain and constructs the corresponding blockchain network architecture to provide operation support for subsequent terminal authentication and power trading.Secondly,based on the blockchain network architecture,this thesis proposes a distributed and multi-level micro grid terminal authentication mechanism.It analyzes the risks and shortcomings of the widely used centralized authentication mechanism,then classifies the terminal equipment in microgrid,forms a multi-level and distributed authentication framework,divides the authentication process into four stages,constructs the authentication structure of multi authentication domain and multi equipment domain,designs two authentication methods for the different situations of equipment belonging to equipment domain,and compares them with the traditional centralized authentication mechanism to verify the rationality and reliability of the distributed authentication mechanism.Thirdly,this thesis proposes a double-layer power trading mechanism of microgrid power market based on block chain.It designed the rules and procedures of the power trading mechanism,introduced the continuous two-way auction mechanism to deal with the multi-party subject matching scenario,and established a credibility model for users in the trading network,which will determine whether users have the qualification to participate in the transaction and the matching priority.Considering the difference in demand of power trading users in microgrid,this thesis divides the trading network,with the bulk trade as the top-level network and the small trade as the bottom network.This thesis designs a two-stage matching mechanism,with the first stage matching according to the network level and the second stage opening the level limit.In addition,this thesis optimizes the continuous two-way auction mechanism and sets the reserved value for users.After each round of matching,there is no need for users to re-quote.The quotation of each user will be corrected according to the market transaction price.If it meets the requirements of users’ reserved value,matching can continue.And uses an example to simulates the double-layer power trading of microgrid and compares the profit gap between the double-layer model and the conventional model,proving the effectiveness and rationality of the double-layer power trading mechanism of microgrid based on blockchain.Finally,this thesis carries out the deployment and testing of microgrid system based on blockchain.In order to build the microgrid terminal authentication and power trading mechanism based on blockchain,combined with the operation scenario of microgrid,it establishes an Ethereum private chain network based on PoA consensus.Based on it,this thesis compiles the smart contract of distributed authentication system and double-layer power trading mechanism.After compilation,it deploys the smart contract to the built Ethereum private chain network for testing.The test results show that the smart contract can meet the expected design objectives.