CN116934344B - A blockchain-based microgrid transaction method and system - Google Patents

Abstract

The invention provides a micro-grid transaction method and system based on a blockchain, and belongs to the field of micro-grid transaction. According to the method, firstly, qualified users are screened out from users applying for micro-grid market trading according to preset micro-grid market admittance conditions. Then, the matching users are determined according to the time of the application transaction, the transaction quotation, the trust value and the benefit value of the qualified users. And then, generating a workflow network according to the admission condition, the behavior audit and the transaction information of the matched user. Finally, intelligent contracts are dynamically generated according to the workflow network, and broadcast and executed in the blockchain network, so that transaction settlement is realized. The method fully utilizes transparency, non-tamper property of the blockchain and automatic execution of the intelligent contract, and can improve efficiency and safety of micro-grid transaction.

Description

A blockchain-based microgrid transaction method and system

Technical field

The present invention relates to the field of microgrid transactions, and in particular to a blockchain-based microgrid transaction method and system.

Background technique

Microgrid is a new type of power system that can operate either connected to or disconnected from the main grid. The emergence of microgrids allows power users to choose the source of power purchase, thus forming a new power market. However, the operation of the microgrid trading market needs to solve many problems, such as how to match transactions fairly and impartially, and how to ensure the transparency and security of transactions.

Traditional microgrid trading methods often rely on centralized market operators for transaction matching and settlement, which has several problems. First, centralized market operators may run the risk of abusing their dominant market position, affecting the fairness of transactions. Secondly, the transparency and security of transaction information are difficult to guarantee, and there may be risks of transaction data being tampered with or leaked. Finally, traditional trading methods usually require manual trade matching and settlement, which is inefficient.

Blockchain technology, with its characteristics of decentralization, high transparency, non-tamperability and smart contracts, provides new possibilities for solving problems in microgrid transactions. However, how to apply blockchain technology to microgrid transactions and design a fair, efficient, and safe microgrid transaction method is an urgent problem that needs to be solved.

Contents of the invention

This application provides a blockchain-based microgrid transaction method and system to improve the efficiency and security of microgrid transactions.

The blockchain-based microgrid transaction method provided by this application includes: screening out qualified users from users who apply for microgrid market transactions according to the preset microgrid market access conditions; and selecting qualified users according to the time of application for transactions by the qualified users. , transaction quotation, trust value and benefit value, determine the matching user; generate a workflow network based on the access conditions, behavior review and transaction information of the matching user; dynamically generate a smart contract based on the workflow network, and add it to the blockchain The smart contract is broadcast and executed on the network to achieve transaction settlement.

Furthermore, selecting qualified users from users who apply for microgrid market transactions based on preset microgrid market access conditions includes: verifying the identity information of the users applying for microgrid market transactions and determining Users with qualified identity information; check the access voltage of the users with qualified identity information and confirm that the users meet the microgrid voltage requirements; verify the users that meet the microgrid voltage requirements and confirm that users have installed smart meters; Users who install smart meters are confirmed as qualified users.

Furthermore, the step of verifying the user who meets the microgrid voltage requirement and confirming the user who has installed the smart meter includes: verifying the user who meets the microgrid voltage requirement and determining whether the user who meets the microgrid voltage requirement corresponds to There is a smart meter, and the user who has installed the smart meter is confirmed, wherein the smart meter is connected to the blockchain client, and the blockchain client predicts the user who meets the microgrid voltage requirements through the connected smart meter. Corresponding power generation and energy consumption data.

Furthermore, determining the matching user based on the time of transaction application, transaction quotation, comprehensive trust value and benefit value of the qualified user includes: based on the time of transaction application, transaction quotation, comprehensive trust value of the qualified user. and benefit value, determine the corresponding sorting queue set, wherein the sorting queue set includes a time sorting queue, a price sorting queue, a trust value sorting queue and a benefit value sorting queue; for each of the qualified users, based on the sorting queue Set, calculate the ranking mean corresponding to the qualified users, where the ranking mean is the average of the ranking results of the qualified users in the time sorting queue, price sorting queue, comprehensive trust value sorting queue and benefit value sorting queue. Number; the qualified users are sorted according to the sorting mean value to determine matching users, where the qualified users with a smaller ranking mean are matched first. If the ranking means of multiple qualified users are the same, the qualified users with high benefit values are matched first.

Furthermore, the comprehensive trust value of the qualified user is calculated by the following formula: , where,/> is the comprehensive trust value of the i-th qualified user,/> is the transaction score trust value of the i-th qualified user,/> is the weighting factor,/> ,/> ,/> is the trust value of the i-th qualified user.

Furthermore, the benefit value of the qualified user is calculated by the following formula: , where,/> is the benefit value of the i-th qualified user,/> is the trust value of the i-th qualified user,/> is the risk factor,/> is the user power of the i-th qualified user,/> Score the user behavior of the i-th qualified user,/> is the satisfaction level of the i-th qualified user.

Furthermore, generating a workflow network based on the access conditions, behavior review, and transaction information of the matching users includes: generating a corresponding workflow network based on the access conditions, behavior review, and transaction information of the matching users. , wherein the workflow network is stored and expressed in the form of a PNML file, where the workflow network includes transaction publishers and bidders, settlement after a successful transaction, and conditions for executing the transaction.

Furthermore, the method of dynamically generating smart contracts based on the workflow network, broadcasting and executing the smart contracts in the blockchain network, and then realizing transaction settlement includes: based on the corresponding workflow network based on Hyperledger Fabric The blockchain platform dynamically generates corresponding access contracts, audit contracts and transaction contracts. The chain codes of the access contracts, audit contracts and transaction contracts at least include the main() function, workflow function and transition function; all generated The access contract, audit contract and transaction contract are broadcast to all network nodes in the blockchain network; the access contract is used to verify the identity of the matching user, generate verification results, and use the audit contract Analyze the trust value and benefit value of the matching users to generate analysis results; execute the transaction contract and complete transaction settlement based on the verification results and the analysis results.

Furthermore, the method further includes: after completing the transaction settlement, obtaining the settlement contract of the matching user; and updating the matching user's settlement contract based on the matching user's feedback on the settlement contract and the score of this transaction. Trust value.

This application provides a blockchain-based microgrid transaction system, including: a screening unit, used to select qualified users from users who apply for microgrid market transactions based on preset microgrid market access conditions; a determination unit, Used to determine matching users based on the time, transaction quotation, trust value and benefit value of the qualified user's application for transaction; a generating unit used to generate a workflow network based on the access conditions, behavior review and transaction information of the matching user ; An implementation unit, used to dynamically generate smart contracts based on the workflow network, and broadcast and execute the smart contracts in the blockchain network to achieve transaction settlement.

The beneficial technical effects of the present invention are mainly reflected in the following aspects:

(1) When determining matching users, not only the time of applying for a transaction and the transaction price are considered, but also the user's trust value and benefit value. This method of comprehensively considering multiple factors can more accurately find the most suitable transaction match, ensure the fairness of the transaction, and avoid unfair transactions due to the advantages of one party.

(2) Through blockchain technology, transactions can be automated, greatly improving transaction efficiency.

(3) The decentralization characteristics of blockchain technology and the automatic execution characteristics of smart contracts can effectively prevent fraud during transactions and improve transaction security.

(4) Generate a workflow network based on matching user access conditions, behavior review and transaction information, and dynamically generate smart contracts based on the workflow network. This method of dynamically generating smart contracts makes the contract more flexible and able to adapt to various transaction status.

Description of drawings

Figure 1 is a flow chart of a blockchain-based microgrid transaction method provided by the first embodiment of the present application.

Figure 2 is a schematic diagram of a blockchain-based microgrid transaction system provided by the second embodiment of the present application.

Detailed ways

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described here. Those skilled in the art can make similar extensions without violating the connotation of the present application. Therefore, the present application is not limited by the specific implementation disclosed below.

The first embodiment of this application provides a blockchain-based microgrid transaction method. Please refer to Figure 1, which is a schematic diagram of the first embodiment of the present application. A blockchain-based microgrid transaction method provided in the first embodiment of the present application will be described in detail below with reference to Figure 1 .

Step S101: Based on the preset microgrid market access conditions, select qualified users from the users who apply for microgrid market transactions.

In this embodiment, qualified users are selected from users who apply for microgrid market transactions based on preset microgrid market access conditions, which may include:

Verify the identity information of users who apply for microgrid market transactions and obtain qualified users with identity information;

Check the access voltage of users with qualified identity information to confirm that users meet the microgrid voltage requirements;

Verify users who meet the microgrid voltage requirements and confirm users who have installed smart meters;

Confirm users who have installed smart meters as qualified users.

Verification of users who meet the microgrid voltage requirements and confirmation of users who have installed smart meters can include:

For users who meet the voltage requirements of the microgrid, verify whether they have installed smart meters and confirm users who have installed smart meters. Among them, the smart meters must be connected to the blockchain client, and the blockchain client can pass the connected smart meter. Predict the power generation and energy consumption data corresponding to users that meet the voltage requirements of the microgrid.

In the microgrid transaction method provided in this embodiment, a microgrid market access mechanism needs to be established. The implementation steps of this mechanism include the following:

First, microgrid users need to submit application materials to the microgrid market supervision agency. For example, users need to provide proof of identity, power demand reports, proof of smart meter installation, etc. The supervision agency will verify the user's identity information and check whether the user's access voltage meets the needs of the microgrid. For example, if the voltage requirement of the microgrid is 220V, then the user's access voltage must also be 220V. In addition, the watchdog will verify whether users have smart meters installed. This smart meter needs to be connected to the blockchain client in order to monitor and record the user's power generation and consumption data, predict the user's power generation and energy consumption, and realize information exchange with other nodes.

If the user passes the above verification, then the user can enter the microgrid market. Regulatory agencies will record user information and broadcast it to the entire network. For example, a regulator might publish a message on the blockchain network stating that the user has been verified and admitted to the market. When all nodes in the entire network reach a consensus, the regulatory agency will return the digital certificate to the user, indicating that the user has successfully registered. At this time, the user's trust value will be initialized, and when the user logs in to the blockchain client for the first time, he must pay a certain amount of deposit and deposit it into the account before he can officially enter the market. For example, users may need to pay a deposit of 1,000 yuan. If the user fails to pass the above verification, the user's registration will fail, and such users will not be able to access the microgrid market.

When a user applies to withdraw from the microgrid market, the supervisory agency will review the user's transaction behavior in the microgrid market. For example, supervisory agencies may check users' transaction records to see if there are any illegal activities, such as malicious manipulation of market prices. If the user passes the review, that is, there is no illegal transaction, then the supervisory agency will broadcast an exit notice throughout the network. When other nodes reach a consensus, the supervisory agency will immediately cancel the user's registration information and digital certificate, and the user can withdraw the deposit in the account at this time. For example, users can withdraw a deposit of 1,000 yuan previously paid. If a user fails the review, that is, there is a trading violation, the supervisory agency will deduct the deposit from the user's account and prohibit the user from entering the market.

Step S102: Determine matching users based on the time of transaction application, transaction quotation, trust value and benefit value of the qualified user.

Specifically, this step may include:

Determine the corresponding sorting queue set based on the qualified user's transaction application time, transaction quotation, comprehensive trust value and benefit value. The sorting queue set may include a time sorting queue, a price sorting queue, a trust value sorting queue and a benefit value sorting queue. , for example, a qualified user ranks fifth in the time sorting queue, third in the price sorting queue, first in the trust value sorting queue, and tenth in the benefit value sorting queue;

For each qualified user, based on the sorting queue set, calculate the ranking mean corresponding to the qualified user, where the ranking mean is the ranking result of the qualified user in the time sorting queue, price sorting queue, comprehensive trust value sorting queue and benefit value sorting queue. the average;

Qualified users are sorted according to the calculated mean value to determine matching users. The smaller mean value is matched first. If the mean values of multiple qualified users are the same, they are sorted according to their benefit values, and those with high benefit values are matched first.

In the microgrid transaction method, the corresponding ranking results can be determined based on the time of the qualified user's application for transaction, transaction quotation, comprehensive trust value and benefit value. For example, if qualified user A applies for transactions earlier than qualified user B, then qualified user A's position in the time sorting queue will be better than that of qualified user B. For example, qualified user A's position in the time sorting queue is second. position, qualified user B's position in the time-ordered queue is third. Similarly, we can also determine the price sorting queue, trust value sorting queue and benefit value sorting queue based on the transaction quotes, comprehensive trust value and benefit value of qualified users.

Then, the ranking mean corresponding to the qualified users can be calculated based on the ranking results of the qualified users in the time sorting queue, price sorting queue, comprehensive trust value sorting queue and benefit value sorting queue. For example, this sorting mean is the average number of the user's sorting results in the time sorting queue, price sorting queue, comprehensive trust value sorting queue and benefit value sorting queue. For example only, if the ranking results of qualified user A in the time sorting queue, price sorting queue, trust value sorting queue and benefit value sorting queue are 1st, 2nd, 3rd and 4th respectively, then the ranking mean of qualified user A That is (1+2+3+4)/4=2.5.

For another example, the ranking average corresponding to qualified users is the weighted average of the ranking results of qualified users in the time ranking queue, price ranking queue, comprehensive trust value ranking queue and benefit value ranking queue.

As an example only, the ranking mean corresponding to qualified users can be calculated based on the following formula:

;

in, is the ranking mean corresponding to the i-th qualified user,/> The sorting result of the time-sorted queue for the i-th qualified user,/> The sorting result of the i-th qualified user in the price sorting queue,/> The sorting result of the i-th qualified user in the comprehensive trust value sorting queue,/> The sorting result of the benefit value sorting queue for the i-th qualified user,/> ,/> ,/> and/> All are default weights.

Finally, users can be sorted based on the calculated ranking mean to determine matching users. For example, if user A's ranking mean is smaller than user B's ranking mean, then user A will be matched first. If the ranking averages of multiple users are the same, they will be sorted according to their benefit values, and users with high benefit values will be matched first. The time queue and price queue are sorted from small to large because earlier times and lower prices are generally considered better. The trust value queue and benefit value queue are sorted from large to small, because higher trust value and benefit value are usually regarded as better. Therefore, when calculating the ranking mean, a smaller ranking mean indicates an earlier time, lower price, higher trust value and higher benefit value, which is generally regarded as a better transaction demand. So in this case, the one with the smallest sorting mean is matched first.

The comprehensive trust value of qualified users is calculated by the following formula:

;

In the above formula, the meaning of each parameter is as follows:

: The comprehensive trust value of the i-th qualified user, which is obtained by considering the user's trust value and the user's transaction score trust value, and then performing a weighted average through the weight factor. Comprehensive trust value is a more comprehensive trust assessment that takes into account not only the user's basic trust value, but also the user's transaction behavior.

: The trust value of the i-th qualified user, which is an evaluation value based on the user's past behavior, reputation and other factors. This value is typically initialized when the user registers and updated based on the user's behavior as they conduct transactions or other activities.

: The transaction score trust value of the i-th qualified user, which is an evaluation value based on the user's transaction behavior. For example, if a user has been very reliable in past transactions, his Transaction Score trust value may be high.

: This is the weighting factor,/> ,/> , which determines the respective importance of the user's trust value and the user's transaction score trust value when calculating the comprehensive trust value. /> has a value between 0 and 1 if/> The closer the value is to 1, the greater the weight of the user's trust value in calculating the comprehensive trust value; conversely, if/> The closer the value is to 0, the greater the weight of the user's transaction score trust value in calculating the comprehensive trust value.

The benefit value of qualified users is calculated according to the following formula:

;

in, is the benefit value of the i-th qualified user, which is obtained by considering the user's trust value, risk factor, user power, user behavior score and user satisfaction, and then using a specific calculation method. Benefit value is a comprehensive evaluation index that can help us understand the benefits that users may obtain from microgrid transactions. /> is the trust value of the i-th qualified user, which is an evaluation value based on the user's past behavior, reputation and other factors. This value is typically initialized when the user registers and updated based on the user's behavior as they conduct transactions or other activities. /> is a risk factor, which reflects the degree of risk involved in conducting a transaction. Risk factors may be affected by a variety of factors, such as market environment, user reputation, etc. /> User electricity for the i-th qualified user, which can be the amount of electricity that the user can provide or need within a specific time. /> Score the user behavior of the i-th qualified user, which is an evaluation value based on the user's transaction behavior. For example, if a user has performed very reliably in past transactions, his behavior score may be high. /> is the satisfaction level of the i-th qualified user, which reflects the user's degree of satisfaction with the microgrid transaction. Satisfaction may be affected by a variety of factors, such as the efficiency of the transaction, the fairness of the transaction, etc.

Step S103: Generate a workflow network based on the matching user's access conditions, behavior review, and transaction information.

Specifically, this step may include the following:

According to the matching user's access conditions, behavior review and transaction information, the corresponding workflow network is generated. The workflow network is stored and expressed in the form of PNML files. The workflow network includes transaction publishers and bidders, and after the transaction is successful, the workflow network is stored and expressed in the form of PNML files. Conditions for settlement and execution of transactions.

In this process, the corresponding workflow network is first generated based on the matching user's access conditions, behavior review and transaction information. This workflow network is a graphical representation that helps understand and track the entire process of a transaction. This workflow network is stored and expressed in the form of PNML (Petri Net Markup Language) files. PNML is an XML-based markup language designed to represent Petri nets, a mathematical model used to describe and analyze system behavior.

In the PNML file, different tags are used to represent different parts of the workflow network:

<place> tag: This tag represents transaction publishers and bidders. In the workflow network, a "place" can be regarded as a status or condition, such as "the user has submitted a transaction application" or "the user's quotation has been accepted."

<transition> tag: This tag represents the settlement after the transaction is successful. In a workflow network, a "transition" can be viewed as an event or action, such as "the user paid the quote" or "the transaction was confirmed."

<arc> tag: This tag defines the conditions for executing different transactions. In a workflow network, an "arc" can be viewed as a connection from a state (place) to an event (transition) or from an event to a state.

Then, the corresponding access contract, review contract, and transaction contract are dynamically generated based on this workflow network. These contracts are smart contracts of the Hyperledger Fabric blockchain platform. Hyperledger Fabric is an open source blockchain platform that supports smart contracts, which are computer programs that can automatically execute and enforce the terms of a contract.

In a Hyperledger Fabric smart contract, there are usually the following main parts:

main() function: This is the entry point of the smart contract, which defines the initialization and transaction processing logic of the smart contract.

Workflow function: This is an external function, which can be called by the client. This function describes the conditions for executing the transition, for example "if the user's offer is accepted, then execute the payment".

Transition function: This is an internal function that can only be called by workflow functions or other transition functions in the same chaincode. This function encapsulates the internal business logic of the transition, such as "deducting the payment amount from the user's account".

In this way, smart contracts can be dynamically generated and executed based on the user's access conditions, behavior review and transaction information, thereby realizing the transaction process of the microgrid.

Step S104: Dynamically generate smart contracts based on the workflow network, and broadcast and execute the smart contracts in the blockchain network to achieve transaction settlement.

Specifically, this step may include:

According to the corresponding workflow network, the corresponding access contract, audit contract, and transaction contract are dynamically generated based on the Hyperledger Fabric blockchain platform. The main content of the chain code includes the main() function, workflow function, and transition function;

Broadcast the generated access contract, audit contract and transaction contract to all network nodes in the blockchain network;

Use the access contract to verify the identity of the matching user and generate verification results, and use the audit contract to analyze the trust value and benefit value of the matching user and generate analysis results;

Based on the verification results and analysis results, the transaction contract is executed and transaction settlement is completed.

After completing the transaction settlement, obtain the settlement contract matching the user;

The matching user's trust value is updated based on the matching user's feedback on the settlement contract and the rating of the transaction.

First, the corresponding access contract, review contract, and transaction contract are dynamically generated based on the workflow network. These contracts are all smart contracts of the Hyperledger Fabric blockchain platform. Hyperledger Fabric is an open source blockchain platform that supports smart contracts, which are computer programs that can automatically execute and enforce the terms of a contract.

Next, the generated smart contracts (including access contracts, audit contracts, and transaction contracts) are broadcast to all network nodes in the blockchain network. This means that all nodes will receive the smart contract and can execute it.

Then, the access contract is used to verify the identity of the matching user. This process may include checking the user's proof of identity, such as a digital signature or public key. At the same time, the audit contract will also be used to analyze the user's trust value and benefit value. This process may include calculating the user's trust value and benefit value, and comparing whether they meet the conditions of the transaction.

Based on the results of verification and analysis, the trading contract is executed and the transaction settlement is completed. This process may involve debiting the payment amount from the buyer's account and then transferring this amount to the seller's account.

After completing the transaction settlement, the settlement contract matching the user is obtained. This contract may include details of the transaction, such as the amount of the transaction, the time of the transaction, and the identities of the parties.

Finally, the matching user's trust value is updated based on the matching user's feedback on the settlement contract and the score of the transaction. This process may include calculating a new trust value and then updating this value to the user's account. In this way, the entire microgrid transaction process is completed.

In the above embodiment, a blockchain-based microgrid transaction method is provided. Correspondingly, this application also provides a blockchain-based microgrid transaction system. Please refer to Figure 2, which is a schematic diagram of an embodiment of a blockchain-based microgrid transaction system of the present application. Since this embodiment, that is, the second embodiment, is basically similar to the method embodiment, the description is relatively simple. For relevant details, please refer to the partial description of the method embodiment. The device embodiments described below are merely illustrative.

The second embodiment of this application provides a blockchain-based microgrid transaction system, including:

The screening unit 201 is used to screen out qualified users from the users who apply for microgrid market transactions according to the preset microgrid market access conditions;

The determining unit 202 is used to determine matching users based on the time, transaction quotation, trust value and benefit value of the qualified user's application for transaction;

The generation unit 203 is used to generate a workflow network based on the access conditions, behavior review and transaction information of matching users;

The implementation unit 204 is used to dynamically generate smart contracts based on the workflow network, and broadcast and execute the smart contracts in the blockchain network to achieve transaction settlement.

Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, the present application The scope of protection shall be subject to the scope defined by the claims of this application.

Claims (2)

1. A blockchain-based microgrid transaction method, characterized by including: According to the preset microgrid market access conditions, qualified users are selected from those who apply for microgrid market transactions; Determine matching users based on the qualified user's application time, transaction quotation, trust value and benefit value; Generate a workflow network based on the matching user's access conditions, behavior review and transaction information; Dynamically generate smart contracts based on the workflow network, and broadcast and execute the smart contracts in the blockchain network to achieve transaction settlement; According to the preset microgrid market access conditions, qualified users are selected from users who apply for microgrid market transactions, including: Verify the identity information of the users applying for microgrid market transactions and determine the users with qualified identity information; Check the access voltage of users with qualified identity information to confirm that users meet the microgrid voltage requirements; Verify users who meet the microgrid voltage requirements and confirm users who have installed smart meters; Confirm the users who have installed smart meters as qualified users; The above-mentioned verification of users who meet the microgrid voltage requirements and confirmation of users who have installed smart meters includes: Verify the user who meets the microgrid voltage requirements, determine whether the user who meets the microgrid voltage requirements corresponds to a smart meter, and confirm the user who has installed a smart meter, where the smart meter is connected to the blockchain client, And the blockchain client predicts the power generation and energy consumption data corresponding to the user that meets the microgrid voltage requirements through the connected smart meter; Establish a microgrid market access mechanism, and the implementation steps include the following: First, microgrid users need to submit application materials to the microgrid market supervision agency. Users need to provide identification, power demand reports, and smart meter installation certificates. The supervision agency will verify the user’s identity information and check whether the user’s access voltage meets the requirements. To meet the needs of microgrids, supervisory agencies verify whether users have installed smart meters. Smart meters need to be connected to the blockchain client in order to monitor and record the user's power generation and consumption data, predict the user's power generation and energy consumption, and realize communication with other nodes. exchange of information; If the user passes the above verification, then the user will be admitted to the microgrid market. The regulatory agency will record the user information, broadcast it to the entire network, and publish a message on the blockchain network stating that the user has passed the verification and is accurate. After entering the market, when all nodes in the entire network reach a consensus, the regulatory agency will return the digital certificate to the user, indicating that the user has successfully registered. At this time, the user's trust value will be initialized, and when the user logs in to the blockchain client for the first time, A certain amount of deposit must be paid and deposited into the account in order to officially enter the market. If the user fails to pass the above verification, the user's registration will fail, and such users will not be able to access the microgrid market; When a user applies to withdraw from the microgrid market, the supervisory agency will review the user's transaction behavior in the microgrid market and check the user's transaction records to see if there are any illegal activities. If the user passes the review, the supervisory agency will broadcast it to the entire network. Exit notice, when other nodes reach a consensus, the supervisory agency will immediately cancel the user's registration information and digital certificate. The user can withdraw the deposit from the account at this time. If the user fails to pass the review, the supervisory agency will deduct the deposit from the user's account. , and ban the user from entering the market; Determining matching users based on the time of transaction application, transaction quotation, comprehensive trust value and benefit value of the qualified user, including: Determine the corresponding sorting queue set based on the qualified user's transaction application time, transaction quotation, comprehensive trust value and benefit value, where the sorting queue set includes a time sorting queue, a price sorting queue, a trust value sorting queue and a benefit value sorting queue; For each qualified user, based on the sorting queue set, calculate the ranking mean corresponding to the qualified user, where the ranking mean is the ranking result of the qualified user in the time sorting queue, price sorting queue, comprehensive trust value sorting queue and benefit value sorting queue. average; Qualified users are sorted according to the calculated average value to determine the matching users, and the smaller ones are matched first. If the average values of multiple qualified users are the same, they are sorted according to their benefit values, and those with higher benefit values are matched first; In the microgrid transaction method, the corresponding sorting result is determined based on the time of the qualified user's application for transaction, transaction quotation, comprehensive trust value and benefit value; including, if the application transaction time of qualified user A is earlier than that of qualified user B, then the qualified user User A's position in the time-sorted queue will be better than that of qualified user B; Similarly, the price sorting queue, trust value sorting queue and benefit value sorting queue are determined based on the transaction quotation, comprehensive trust value and benefit value of qualified users; Then, based on the ranking results of qualified users in the time sorting queue, price sorting queue, comprehensive trust value sorting queue and benefit value sorting queue, the ranking mean corresponding to the qualified users is calculated; including, this sorting mean is the ranking mean of the users in the time sorting queue, price sorting queue The average number of sorting results in the queue, comprehensive trust value sorting queue and benefit value sorting queue; if the sorting results of qualified user A in the time sorting queue, price sorting queue, trust value sorting queue and benefit value sorting queue are respectively 1st , 2, 3, and 4, then the ranking mean of qualified user A is (1+2+3+4)/4=2.5; It also includes that the ranking average corresponding to qualified users is the weighted average of the ranking results of qualified users in the time ranking queue, price ranking queue, comprehensive trust value ranking queue and benefit value ranking queue; Calculate the ranking mean corresponding to qualified users based on the following formula: ; in, is the ranking mean corresponding to the i-th qualified user,/> The sorting result of the time-sorted queue for the i-th qualified user,/> The sorting result of the i-th qualified user in the price sorting queue,/> The sorting result of the i-th qualified user in the comprehensive trust value sorting queue,/> The sorting result of the benefit value sorting queue for the i-th qualified user,/> ,/> ,/> and/> All are preset weights; Finally, users are sorted according to the calculated ranking mean to determine matching users; including, if the ranking mean of user A is smaller than the ranking mean of user B, then user A will be matched first; if the ranking mean of multiple users is the same , then they will be sorted according to their benefit value, and users with high benefit value will be matched first; the time queue and price queue are sorted from small to large, with earlier time and lower price being considered better; and trust The value queue and benefit value queue are sorted from large to small, with higher trust values and benefit values being considered better; therefore, when calculating the sorting mean, a smaller sorting mean represents an earlier time, a lower Price, higher trust value and higher benefit value are regarded as a better transaction requirement; so in this case, the one with the smallest ranking mean is matched first; The comprehensive trust value of qualified users is calculated by the following formula: ; In the above formula, the meaning of each parameter is as follows: : The comprehensive trust value of the i-th qualified user, which is obtained by considering the user's trust value and the user's transaction score trust value, and then performing a weighted average through the weight factor; the comprehensive trust value is a more comprehensive trust assessment, which Not only the user’s basic trust value is considered, but also the user’s transaction behavior is considered; : The trust value of the i-th qualified user, which is an evaluation value based on the user's past behavior and reputation factors; this value is usually initialized when the user registers, and is determined based on the user's behavior when performing transactions or other activities. renew; : The transaction score trust value of the i-th qualified user, which is an evaluation value based on the user’s transaction behavior; : This is the weighting factor,/> ,/> , which determines the respective importance of the user's trust value and the user's transaction score trust value when calculating the comprehensive trust value;/> has a value between 0 and 1 if/> The closer the value is to 1, the greater the weight of the user's trust value in calculating the comprehensive trust value; conversely, if/> The closer the value is to 0, the greater the weight of the user's transaction score trust value in calculating the comprehensive trust value; The benefit value of qualified users is calculated according to the following formula: ; Among them, δ _i is the benefit value of the i-th qualified user, which is obtained by considering the user's trust value, risk factor, user power, user behavior score and user satisfaction, and then using a specific calculation method; It is a risk factor, which reflects the degree of risk of conducting transactions; the risk factor is affected by the market environment and the user's reputation;/> User power for the i-th qualified user, which is the amount of power that the user can provide or need within a specific time;/> Score the user behavior of the i-th qualified user, which is an evaluation value based on the user's transaction behavior;/> is the satisfaction level of the i-th qualified user, which reflects the user’s degree of satisfaction with the microgrid transaction; Generating a workflow network based on the matching user's access conditions, behavior review and transaction information includes: Generate a corresponding workflow network based on the matching user's access conditions, behavior review and transaction information, where the workflow network is stored and expressed in the form of a PNML file, where the workflow network includes a transaction publisher and bidders, settlement after a successful transaction and conditions for executing the transaction; In the PNML file, different tags are used to represent different parts of the workflow network: <place> tag: This tag represents the transaction publisher and bidder. In the workflow network, a "place" is regarded as a status or condition; <transition> tag: This tag represents the settlement after a successful transaction. In the workflow network, a "transition" is regarded as an event or action; <arc> tag: This tag defines the conditions for executing different transactions. In the workflow network, an "arc" is regarded as a connection from a state place to an event transition or from an event to a state; Then, the corresponding access contract, audit contract, and transaction contract are dynamically generated based on this workflow network; these contracts are smart contracts of the Hyperledger Fabric blockchain platform; Hyperledger Fabric is an open source blockchain platform that supports smart contracts, which are computer programs that automatically execute and enforce the terms of a contract; Smart contracts in Hyperledger Fabric have the following parts: main() function: This is the entry point of the smart contract, which defines the initialization and transaction processing logic of the smart contract; Workflow function: This is an external function that can be called by the client; this function describes the conditions for executing the transition; Transition function: This is an internal function that can only be called by workflow functions or other transition functions in the same chain code; this function encapsulates the internal business logic of the transition; In this way, smart contracts are dynamically generated and executed based on the user's access conditions, behavior review and transaction information, thereby realizing the transaction process of the microgrid; The method of dynamically generating smart contracts based on the workflow network, broadcasting and executing the smart contracts in the blockchain network, and thereby realizing transaction settlement, includes: According to the corresponding workflow network, the corresponding access contract, audit contract and transaction contract are dynamically generated based on the Hyperledger Fabric blockchain platform. The chain codes of the access contract, audit contract and transaction contract at least include the main() function, Workflow functions and transition functions; Broadcast the generated access contract, audit contract and transaction contract to the entire network nodes in the blockchain network; this means that all nodes will receive the smart contract and execute it; The access contract is used to verify the identity of the matching user and a verification result is generated, and the audit contract is used to analyze the trust value and benefit value of the matching user and generate analysis results; this process includes checking the user's Identity proof, specifically a digital signature or public key; at the same time, use the audit contract to analyze the user's trust value and benefit value; this process includes calculating the user's trust value and benefit value, and comparing whether they meet the conditions of the transaction; According to the verification results and the analysis results, execute the transaction contract and complete transaction settlement; this process includes deducting the payment amount from the buyer's account, and then transferring this amount to the seller's account; After completing the transaction settlement, the settlement contract matching the user is obtained; this contract includes the detailed information of the transaction, specifically the transaction amount, time and the identities of both parties; The matching user's trust value is updated based on the matching user's feedback on the settlement contract and the rating of the transaction. 2. A blockchain-based microgrid transaction system applying the blockchain-based microgrid transaction method as claimed in claim 1, characterized in that it includes: The screening unit is used to screen out qualified users from users who apply for microgrid market transactions based on preset microgrid market access conditions; A determining unit, configured to determine matching users based on the time of transaction application, transaction quotation, trust value and benefit value of the qualified user; A generation unit configured to generate a workflow network based on the access conditions, behavior review and transaction information of the matching user; An implementation unit is used to dynamically generate smart contracts based on the workflow network, and broadcast and execute the smart contracts in the blockchain network to achieve transaction settlement.