KR102128476B1 - System and method for trading power based on blockchain smart contract - Google Patents

Abstract

The blockchain smart contract-based power transaction system includes a plurality of smart meters and a plurality of full node servers. The smart meter participates as a light node in the blockchain network, initiates an auction by sending and executing a smart contract with the auction conditions set by the seller who generated electricity to the blockchain, or the buyer who wants to purchase power checks the auction conditions It executes a smart contract to create a transaction for bidding and sends it to the blockchain network to try to bid. The full node server participates as a full node in the blockchain network to maintain all blockchain data, and adds the transaction sent by the smart meter to the blockchain by performing a consensus algorithm. In addition, it is created as a block as a transaction related to the auction transmitted by the smart meter and added to the blockchain.

Description

Blockchain smart contract based power trading system and its method{SYSTEM AND METHOD FOR TRADING POWER BASED ON BLOCKCHAIN SMART CONTRACT}

Disclosed is a system for trading power in a microgrid environment, and a system in which power trading is automatically performed through an auction implemented with a blockchain smart contract technology.

Existing power systems are unable to efficiently manage supply and demand due to the absence of information exchange systems between power producers and consumers. The existing power management method is characterized in that power producers and consumers are separated, and there is a limit in the technology for storing power energy, so consumption must be performed simultaneously with production. In a one-way structure in which electricity producers and consumers are separated, they cannot respond sensitively to electricity demand, so they must produce more than the current demand. In addition, an extra power generation facility must be built to handle the peak load, where electricity demand is concentrated, and if it is not the maximum load, it will lead to waste.

To solve this waste, a smart grid is being introduced. The smart grid is a next-generation intelligent power grid that enables efficient power operation by integrating information and communication technology (ICT) into electricity production, distribution, and consumption processes, allowing power providers and consumers to exchange real-time power information in both directions. With the advent of Smart Grid, it was possible to reduce the waste of energy than the classic power management method, but central management is essential.

Recently, a microgrid environment that includes a concept of a prosumer that a consumer can become a supplier in a unidirectional configuration in which the supplier and the consumer are divided for efficient power management has emerged. In a microgrid environment, users can generate power and sell power as needed, and also purchase power generated by other users.

Blockchain is in the spotlight as a reliable data sharing technology in a distributed network environment. The first blockchain was proposed in 2009 by Satoshi Nakamoto's paper as a technology capable of realizing Bitcoin cryptocurrency trading. The first-generation blockchain technology has developed into a distributed ledger technology (DLT) for realizing cryptocurrency transactions. In the 2nd generation, smart contracts, a reliable code execution technology even in a distributed network environment, were introduced. This ensures that contracts with various conditions are executed without a central system or human intervention, so that untrusted entities can trust smart contracts to allow contracts to proceed.

The proposed invention aims to provide a method for a user who has generated power in a microgrid environment to conduct a decentralized transparent and safe power transaction between users by utilizing a blockchain rather than an existing centralized power transaction. .

In addition, the proposed invention aims to provide a method of searching for the best price in an automated manner through an auction using a smart contract of a blockchain to conclude a power transaction and supply power between users according to the transaction results.

According to one aspect, the blockchain smart contract-based power transaction system includes a plurality of smart meters and a plurality of full node servers.

The smart meter participates as a light node in the blockchain network, initiates an auction by sending and executing a smart contract with the auction conditions set by the seller who generated electricity to the blockchain, or the buyer who wants to purchase power checks the auction conditions It executes a smart contract to create a transaction for bidding and sends it to the blockchain network to try to bid.

The full node server participates as a full node in the blockchain network to maintain all blockchain data, and creates a block and adds it to the blockchain by performing a consensus algorithm on the transaction sent by the smart meter. In addition, it is created as a block as a transaction related to the auction transmitted by the smart meter and added to the blockchain.

According to an aspect, the blockchain smart contract-based power auction method includes an initialization step, a bidding step, a successful bidding step, and a retrieving step defined and executed in the smart contract.

The initialization step is a process of transmitting a transaction defining a contract to the blockchain, and a smart contract with auction conditions is transmitted from the seller's smart meter to the blockchain.

In the bidding step, the bidding module of the smart contract is called through the blockchain transaction on the smart meter of the buyer to present the bid.

The successful bidding stage selects the successful bidder by invoking the successful bidding module of the smart contract through the blockchain transaction when the auction time set in the auction conditions in the seller's smart meter ends.

The payback step collects the bid by calling the payback module of the smart contract through the blockchain transaction on the smart meter of the buyers who have bid.

According to a further aspect of the invention, the blockchain smart contract-based power auction method further includes a power supply step.

After the auction ends, the power is supplied from the seller's smart meter to the successful bidder's smart meter according to the supply time and supply amount set in the auction conditions.

According to another aspect of the invention, the block chain smart contract-based power auction method can be auctioned simultaneously and sequentially by a plurality of sellers and a plurality of buyers.

The proposed blockchain smart contract-based power transaction system enables users who produce power in a micro-grid environment to conduct decentralized, transparent and safe power transactions between users by utilizing blockchain rather than existing centralized power transaction. .

In addition, the proposed blockchain smart contract-based power trading system can automate and search for the best price through an auction utilizing the smart contract of the blockchain to sign power transactions and supply power between users according to the transaction results. .

1 is a conceptual diagram of the Ethereum blockchain network structure.
2 is a type classification diagram of an auction.
3 is a conceptual diagram of a power transaction system in a microgrid environment based on the Ethereum blockchain.
4 is a process diagram for an auction proceeding according to an embodiment.
5 is an example code of a smart contract written in solidity.

The foregoing, and additional aspects are embodied through embodiments described with reference to the accompanying drawings. It is understood that various combinations of elements in each embodiment are possible within the embodiment, unless otherwise stated or contradictory to each other. Each block in the block diagram may represent a physical component in some cases, but in another case, it may be a logical expression of a function of one physical component or a plurality of physical components. Sometimes the entity of a block or part of it may be a set of program instructions. All or some of these blocks may be implemented by hardware, software, or a combination thereof.

Microgrid is a decentralized power management method that adds the concept of an energy prosumer to a smart grid. Energy Prosumer is an existing power producer that produces electricity through infrastructure (eg, thermal power plants, nuclear power plants, hydro power plants, etc.). It means a possible person. With the emergence of energy prosumers, power transactions between individuals are required, and energy loss can be minimized by supplying power by exchanging information on power demand and power supply in real time between energy prosumers. However, there is no environment where individual energy prosumers can execute autonomous transactions without relying on a central trust agency.

1 is a conceptual diagram of the Ethereum blockchain network structure. Ethereum is a next-generation smart contract distributed application technology launched in 2015 and is an open source project under development at the Ethereum Foundation based in Switzerland. Ethereum is equipped with an extension language with Turing-Completeness, such as Solidity, unlike conventional blockchain-based technology, which is difficult to use in areas other than virtual currency, making smart contracts easy and simple It can be made into a program.

Ethereum, like Bitcoin, has the feature of recording the transaction history on the P2P network on the blockchain while also recording the smart contract itself or execution history.

As shown in the structure of the public Ethereum shown in FIG. 1, the nodes constituting the Ethereum blockchain are divided into a full node and a light node. The full node maintains all blockchain data, performs consensus algorithms to operate the Ethereum network, and earns profits (block rewards, fees) through the role of running, and the light node runs distributed applications on the Ethereum platform and charges fees. To pay.

2 is a type classification diagram of an auction. As shown in FIG. 2, the types of auctions are divided into single auction and double auction types according to the number of simultaneous auctions, and closed bids according to whether auction progress information is disclosed or not. ) And public tender (Outcry)

First Price Sealed Bid Auction (FPSB) is a single auction method in which the bidder who presents the highest bidding price among bidding prices offered by bidders is determined as the successful bidder.

Dutch Auction is a method in which a seller starts at a high price and gradually lowers the auction price, and one of the bidders wins.

In English Auction, bidders compete with each other, offer higher prices, and finally win bidders who have offered the highest price.

Sealed-bid Double Auction (SDA) is a multi-auction method that determines the successful bidders and successful bidders by simultaneously receiving private bids from sellers and buyers for a certain period of time.

Continuous Double Auction (CDA) continues to be conducted by bidding and winning at a time desired by multiple sellers and buyers.

3 is a conceptual diagram of a power transaction system in a microgrid environment based on the Ethereum blockchain. The blockchain smart contract-based power transaction system according to an aspect includes a plurality of smart meters 100 and a plurality of full-node servers 200 to ensure decentralized application execution in power auction in a microgrid environment. The auction is executed using the smart contract technology of the blockchain.

The smart meter 100 is an embedded device used by a prosumer in a microgrid environment and shares power supply and demand information to efficiently operate a power management system. The smart meter 100 includes a function to perform network communication with the outside.

In addition, the smart meter 100 participates as a light node in the blockchain network. That is, it connects to the blockchain network but does not maintain all blockchain data, and does not participate in the consensus algorithm for adding blocks to the blockchain. However, it is possible to create and send a transaction to the blockchain network, or execute a smart contract registered in the blockchain on the blockchain virtual machine included in the blockchain client software. Therefore, the smart meter 100 must have blockchain client software installed in order to connect to the blockchain network. Depending on the aspect of the invention, Ethereum may be used as a blockchain technology, and when Ethereum is used, go-etherium (geth) developed in Go language may be installed and executed. In this case, the execution environment of the smart contract becomes the Ethereum Virtual Machine (EVM) and is included in the Ethereum client software. However, the present invention is not limited to this, and the Ethereum client can use one developed in other languages such as C++ and Python, and a blockchain technology supporting other smart contracts can be used.

The smart meter 100 starts an auction by executing a smart contract in which auction conditions and auction execution codes are defined. The smart meter 100 in this case is a smart meter 100 of a seller who wants to sell the produced power, and provides a user interface for inputting auction conditions and writing smart contract codes for auction. According to an aspect of the invention, the smart meter 100 may provide a condition input UI and a smart contract creation UI, including a touch screen, and an application (or console application) executed on a smart device or PC owned by a user. Through the connection to the smart meter 100, auction conditions and smart contract codes can be created. In another aspect, a web server is installed on the smart meter 100 and input of auction conditions or creation of a smart contract code may be performed through a UI provided through a web socket.

Auction conditions may include sales power amount, power supply time, minimum price, and auction start time. The auction conditions can also be used as initial settings for the smart contract code. <Table 1> below shows an example of the initial value of a condition (variable) used in a smart contract.

Variable name function value auctionType Auction type of contract 1 (public auction) beneficiary Beneficiary Seller's Address auctionStart Auction start time t ₁ (time when the contract is registered on the blockchain) biddingTime Auction time t ₂ (time to proceed with the auction) min Seller setting minimum price 30 ethers power Sales power 100 kW powerStart Power supply start time t ₃ (Seller-specified supply start time) powerEnd Power supply end time t ₄ (Seller supply end time) highestBidder The highest price presenter - highestBid Current highest bid - ended Whether the auction ends 0 (1 at the end)

Variables are initialized with the values shown in <Table 1> to execute the smart contract. However, t ₁ may be set when the contract is transmitted to the blockchain and registered through the consensus algorithm. After that, the highestBidder, highestBid, and ended variables are changed during execution, and the highest bidder's address and bid amount are reflected in highestBidder and highestBid, respectively, when the bid is higher. ended is set to 1 to indicate the end of the auction by the seller at the successful bid.

In addition, the smart meter 100 attempts a bid by checking and executing the auction conditions of the smart contract. In this case, the smart meter 100 is a smart meter of a buyer who wants to purchase power, and provides a user interface to search for an auction by entering desired conditions, and a user interface to provide a bid for the searched auction and attempt to bid. do. According to an aspect of the invention, the smart meter 100 may provide a search UI and a bidding UI, including a touch screen, and access the smart meter 100 through an application running on a smart device or a PC owned by the user. You can either search or offer bids and bid. In another aspect, a web server is installed on the smart meter 100 to search or bid through a UI provided through a web socket.

The number of smart meters 100 participating in the blockchain network is not limited, and the smart meters 100 may also exist as many as the number of prosumers included in the microgrid environment. In addition, the smart meter 100 is not divided for the seller and the buyer. It is the same equipment and the functions executed at the auction are classified according to the role.

A full node server is a node that participates in the blockchain network to download and maintain all blockchain data. Therefore, it is possible to verify the transaction by itself without the help of other nodes. In addition, it receives the smart contracts and transactions from the smart meter 100 and creates a block containing them to perform a consensus algorithm that adds the block to the blockchain to operate the blockchain network. In the full node server 200, an environment provider providing a power trading environment provides computing power and receives a fee from prosumers. Since the full node server 200 exists in a plurality of blockchain networks to perform the consensus algorithm, it must exist at least two.

The consensus algorithm is an algorithm for participants to obtain consensus on a single result in a network having a time difference in information arrival, such as a P2P network. Blockchain uses a consensus algorithm to review the legitimacy of the blocks created by each node and reflect them on the blockchain being shared across the network.

The consensus algorithm may be Proof of Work (PoW) or Proof of Stake (PoS). Proof of work is a way to prove that the full nodes participating in the blockchain network have independently completed the task of adding the new block to the blockchain by computing the block hash for the new block less than or equal to a specific target using computing power. use. Proof-of-stake creates blocks from their own shares rather than computing power and adds them to the blockchain. That is, the probability of a block being created and added to the blockchain by the full node server 200 having a greater stake increases.

The full node server 200 is a server on which the blockchain client software is installed, and the installed blockchain client software is set to operate as a full node.

A smart contract used in a power transaction system based on a blockchain smart contract according to another aspect may include an initialization module, a bidding module, a successful bidding module, and a recovery module.

The initialization module is implemented as a function that performs the initialization function of the smart contract type auction contract. The initialization module defines the contract and sends it to the blockchain. The initialization module is a function in which a prosumer who sells electricity defines a smart contract by specifying the auction conditions including the amount of sales power, supply time, minimum price, auction time, etc., and starts an auction.

The bidding module is implemented as a function that performs a function of bidding on an auction in an auction contract in the form of a smart contract. The bidding module checks the auction conditions and tries to bid. This is a function for prosumers who want to purchase electricity to check the conditions of the auction and bid.

The winning bid module is implemented as a function that performs a function of ending an auction in a smart contract-type auction contract. The winning bid module selects the winning bidders and ends the auction. The winning bid module selects a bidder who presents the highest price when the auction time designated by the seller ends, pays a fee to the environmental provider, and informs the end of the auction.

The payback module is implemented as a function that performs a function for the bidders to recover the balance of the bid after the auction ends in the smart contract type auction contract. Each unbidden bidder collects the balance of the bid for the successful bid through the recovery module.

Each module included in the smart contract is registered in the block of the blockchain and shared with the smart meters 100 of each prosumer. Therefore, it is not necessary for the smart meter 100 having created the smart contract to provide another smart meter 100 separately. Each buyer (bidder) participating in the auction executes a smart contract through the virtual execution environment of the blockchain client software installed on his smart meter 100. Depending on the aspect of the invention, Ethereum may be used as a blockchain technology, and when Ethereum is used, a go-etherium (geth) developed in the Go language may be installed in the smart meter 100. In this case, the execution environment of the smart contract becomes the Ethereum Virtual Machine (EVM), which is included in the Ethereum client software. However, the present invention is not limited to this, and the Ethereum client can use one developed in other languages such as C++ and Python, and a blockchain technology supporting other smart contracts can be used.

In an auction executed by a smart contract used in a power transaction system based on a blockchain smart contract according to another aspect, when a buyer attempts multiple bids for the same auction, each bid is frozen in the auction.

That is, when a bidder who is a buyer who intends to purchase electric power attempts multiple bidding for the same auction, the bidding is possible only when the bidder has an amount corresponding to the sum of bids corresponding to each bidding. For example, in order for the same bidder to attempt a bid for 50 for the same auction, and then to try again for a bid for 60, a total of 110 must be held. Such a freezing function can prevent excessive bidding by buyers and prevent auctions from overheating, and a small amount of change in the bid amount can be used to alleviate excessive transactions due to auctions.

According to another aspect, the block chain smart contract-based power transaction system includes a power supply function that supplies power sold from a seller to a buyer according to auction results.

The power supply function may define a smart contract and supply power to the successful bidder's smart meter 100 in accordance with the supply time of the sold electricity meter sold by the seller's smart meter 100 after the auction ends. The power supply function is not implemented in the smart contract, but is implemented in the smart meter 100.

The block chain smart contract based power auction method according to an embodiment includes an initialization step, a bidding step, a successful bidding step, and a retrieving step.

In the initializing step, the smart meter 100 of the seller sends the smart contract with the auction conditions set to the blockchain to start the auction. The initialization step is executed by calling a function (constructor function) that performs the initialization function of the auction contract in the form of a smart contract. The initializing step is a step in which a prosumer who sells electricity defines a smart contract by specifying auction conditions including the amount of sales power, supply time, minimum price, auction time, etc., and starts an auction.

In the bidding step, the smart meter 100 of the buyer calls a bid module of the smart contract through a blockchain transaction to present a bid. The bidding step is executed by calling a function that performs a function of bidding on an auction in an auction contract in the form of a smart contract. The bidding step is a step in which prosumers who want to purchase power check the conditions of the auction and bid.

The successful bidding step selects the successful bidder by calling the successful bidding module of the smart contract through the blockchain transaction when the auction time set in the auction conditions is ended in the smart meter 100 of the seller. The successful bidding step is executed by calling a function that performs a function of terminating an auction in an auction contract in the form of a smart contract. The successful bidding stage selects the successful bidders and ends the auction. In the successful bidding stage, when the auction time designated by the seller ends, the bidder who has presented the highest price is selected, a fee is paid to the environmental provider, and the auction is terminated.

In the retrieval step, the smart meter 100 of the buyers who have made a bid calls the recovery module of the smart contract through a blockchain transaction to recover the bid. The retrieval step is executed by calling a function in which a bidder collects the balance of the bid after the auction ends in the smart contract type auction contract. Each unbidden bidder collects the balance of the bid for the bid that was successful in the recovery step.

The smart meter 100 is an embedded device used by a prosumer in a microgrid environment and shares power supply and demand information to efficiently operate a power management system. The smart meter 100 includes a function to perform network communication with the outside.

In addition, the smart meter 100 may participate as a light node in the blockchain network to generate and transmit transactions to the blockchain network, or execute a smart contract registered in the blockchain on the blockchain virtual machine included in the blockchain client software. . Therefore, the smart meter 100 is installed with the blockchain client software to connect to the blockchain network. Depending on the aspect of the invention, Ethereum may be used as a blockchain technology, and when Ethereum is used, go-etherium (geth) developed in Go language may be installed and executed. In this case, the execution environment of the smart contract becomes the Ethereum Virtual Machine (EVM) and is included in the Ethereum client software. However, the present invention is not limited to this, and the Ethereum client can use one developed in other languages such as C++ and Python, and a blockchain technology supporting other smart contracts can be used.

Auction conditions may include sales power amount, power supply time, minimum price, and auction start time. The auction conditions can also be used as initial settings for the smart contract code. <Table 1> shows an example of the initial value of a condition (variable) used in a smart contract.

The block chain smart contract-based power auction method according to another embodiment includes an initialization step, a bidding step, a successful bidding step, a retrieving step, and further includes a power supply step.

In the power supply step, after the auction ends, power is supplied from the smart meter 100 of the seller to the smart meter 100 of the successful bidder according to the supply time and the supply amount set in the auction conditions.

In the power auction method based on the blockchain smart contract according to another embodiment, the auction conditions set in the smart contract include the auction start time and the auction execution time, and the auction executed by the smart contract is auctioned at the set auction start time. The auction may be started and the auction may be ended after the set auction time has elapsed.

An auction by a smart contract can be started at a time specified by the seller. Depending on the aspect of the invention, a method of preventing a bid from being tried before the auction start time may be used. In another aspect of the invention, a method of starting an auction can be used when a seller executes a code executing a code to start an auction by including a code to start an auction in a smart contract.

In the power auction method based on the blockchain smart contract according to another embodiment, in the auction executed by the smart contract, each bid is frozen in the auction when a buyer attempts multiple bids for the same auction.

That is, when a bidder who is a buyer who intends to purchase electric power attempts multiple bidding for the same auction, the bidding is possible only when the bidder has an amount corresponding to the sum of bids corresponding to each bidding. For example, in order for the same bidder to attempt a bid for 50 for the same auction, and then to try again for a bid for 60, a total of 110 must be held. Such a freezing function can prevent excessive bidding by buyers and prevent auctions from overheating, and a small amount of change in the bid amount can be used to alleviate excessive transactions due to auctions.

4 is a process diagram for an auction proceeding according to an embodiment. The auction A defined in <Table 1> is defined in the transaction through the initialization process in which the seller sets the auction conditions through the smart meter (100-1) (S1000) and creates an object of the auction contract (calling the constructor) in the blockchain. Notify (S1100). After being included in the block by the full node server 200 (S1110), all buyers check auction information and decide whether to try to bid. In FIG. 4, it is illustrated that buyers 1 and 2 accept bid conditions and attempt bids (S1111, S1112). Other buyers N do not attempt to buy because the auction conditions such as the auction start price, sales power, and supply time do not match (S1113).

Three bidding attempts are shown in the bidding process. Buyer 1 attempts to bid with 35 higher than the minimum bid amount (min) 30 through the smart meter (100-2) (S1200), and Buyer 2 through the smart meter (100-3) to 40, which is higher than the buyer 1 bid Trying to bid (S1300). Buyer 1 again abandons the attempt to bid at 45 through the smart meter 100-2 (S1400). The function Bid(), which is called when a bid is attempted, compares the current highestBidder variable and highestBid variable values and reflects information about the bid attempt. In addition, since the function Bid() is called through the transaction of Ethereum, in order for individual bid attempts to be reflected in the blockchain, block creation of the full node for the transaction is made (S1210, S1310, S1410).

The successful bidding process is a process in which the seller ends the auction and obtains a bid at the end of the auction time. As the bid price of buyer 1 ends at the highest price, the end variable of auction A is reflected as 1 (S1500), and the buyers who tried to bid prepare for the balance recovery, and the seller pays a fee to the full node (environment provider).

During the recall process, the recall function was called twice. With the first bidding attempt of Buyer 1, the amount equivalent to 35 that was frozen and Buyer 2 are not awarded, and the amount corresponding to the amount that was frozen until the end of the auction is 40 (S1600, S1620).

The power supply process is a process of supplying the supply time and supply amount specified at the time of initialization of the auction A to the buyer (S1700). This function should be implemented in the smart meter 100, not in the blockchain, and supply is made according to the auction result maintained in the blockchain.

5 is an example code of a smart contract written in solidity. The main function of the solidity code shown in FIG. 5 will be described.

The Auction constructor is a function that performs the initialization role of setting the first variable field when sending a smart contract.

The Bid function sends a virtual currency when calling. Since the bid is attempted by the amount of the transfer, the contract determines whether to accept the bid by checking the amount of the transaction.

The Auctionend function checks the time of the auction, and when the time ends, calls the function to win the prosumer who offered the best price.

When the Withdraw function is called, the buyer's unsuccessful bid is collected.

In order to use a smart contract in Ethereum, the contract code compiled in the transaction must be included and transmitted, and it must be included in the block to be used. The function Auction acts as a constructor that sets the first variable when including contract code in a transaction. Afterwards, the bid function, the auctionEnd function for ending the auction and bidding, and the withdraw function for recovering the unbidden amount can be called through a transaction for a bid attempt.

In a method for power auction based on a blockchain smart contract according to an embodiment, a plurality of auctions may be initiated by transmitting smart contracts with auction conditions set by the smart meter 100 of a plurality of sellers to the blockchain, respectively. That is, while one auction is in progress, any number of other auctions may be simultaneously performed, and each buyer may attempt to bid by finding an auction that satisfies the desired conditions.

In the above, the present invention has been described through embodiments with reference to the accompanying drawings, but is not limited thereto, and it should be interpreted to cover various modifications that can be obviously derived by those skilled in the art. The claims are intended to cover these variations.

100: smart meter
200: full node server

Claims (9)

Multiple smart meters that participate in the blockchain network as a light node to initiate an auction by executing a smart contract with auction conditions and auction execution codes defined, or to check and execute the auction conditions of the smart contract to attempt bidding ; And
A plurality of full node servers that participate in the blockchain network to maintain all blockchain data, perform a consensus algorithm that adds transactions including smart contracts to the blockchain, and operate the blockchain network;
Including,
The auction conditions set in the smart contract include the auction start time and the auction execution time, and the auction executed by the smart contract starts the auction at the set auction start time and the auction ends after the set auction execution time elapses.
The auction executed by the smart contract is a block chain smart contract-based power transaction system in which each bid is frozen in the auction when the buyer attempts multiple bids for the same auction.
According to claim 1,
The smart contract defines the contract and transmits it to the blockchain, the initialization module that checks the auction conditions and attempts to bid, the bid module that selects the successful bidders and ends the auction, and the balance of bids for the successful bid Blockchain smart contract-based power transaction system including a recovery module to recover.
delete According to claim 1,
A block chain smart contract-based power transaction system that defines the smart contract and supplies the electricity supplied by the seller's smart meter to the smart meter of the successful bidder according to the supply time.
In the power auction method based on blockchain smart contract,
An initialization step of starting an auction by sending a smart contract with auction conditions set by the seller's smart meter to the blockchain;
A bidding step of presenting a bid by calling a bid module of a smart contract through a blockchain transaction in a smart meter of a buyer;
A successful bidding step of selecting a successful bidder by calling a successful bidding module of a smart contract through a blockchain transaction when the auction time set in the auction conditions in the seller's smart meter ends;
A recovery step of recovering a bid by calling a recovery module of a smart contract through a blockchain transaction in a smart meter of buyers who have made a bid;
Including,
The auction conditions set in the smart contract include the auction start time and the auction execution time, and the auction executed by the smart contract starts the auction at the set auction start time and the auction ends after the set auction execution time elapses.
An auction executed by a smart contract is a power auction method in which each bid is frozen in an auction when a buyer tries multiple bids for the same auction.
The method of claim 5, wherein:
A power supply step of supplying power from the smart meter of the seller to the smart meter of the successful bidder according to the supply time and the supply amount set in the auction conditions after the auction ends;
Power auction method further comprising.
delete delete The method of claim 5,
A power auction method in which multiple auctions are initiated by transmitting smart contracts with auction conditions set by a smart meter of a plurality of sellers to the blockchain, respectively.

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