KR20120094172A - Electric power trading method and energy management system performing the same - Google Patents

Abstract

PURPOSE: An electricity transaction method and an energy management system using the same are provided to implement the distribution of a demand for electricity by forming a single community group to purchase electricity for common use and separately using the electricity. CONSTITUTION: An electricity information collecting unit(110) collects available electricity information. An electricity transaction setting unit(120) transceives a message including the available electricity information in response to a request message for purchasing electricity received from other electricity consumption nodes. The electricity transaction setting unit sets up an electricity transaction through transceiving the messages. If the electricity transaction with other electricity consumption nodes is concluded, a voucher generating unit(130) generates a voucher about the concluded electricity transaction.

Description

Power trading method and energy management system using the same {ELECTRIC POWER TRADING METHOD AND ENERGY MANAGEMENT SYSTEM PERFORMING THE SAME}

The present invention relates to a power transaction method used in a smart grid and an energy management system using the same.

Smart grid refers to a power grid with enhanced communication network capabilities. Smart Grid helps automate a whole series of processes from power generation to power consumption, and also enables two-way communication between consumers and power service providers.

With Smart Grid, consumers can install power devices in their homes or businesses to produce renewable energy and sell it to the power market. After real-time power prices are tracked through smart meters, consumers can selectively use power at affordable prices.

On the other hand, the consumer receives a one-on-one power and power information service from the power service provider under a contract with the power service provider. However, consumers typically consume power at specific times rather than evenly over the entire period, despite contracts with power service providers. For example, glove manufacturers produce gloves primarily in the fall or winter, so they consume more power in the fall or winter than in the spring or summer. As such, when most consumers consume power according to their respective patterns, power consumption is distributed, and production and consumption of power are inefficient, which causes a lot of waste.

In addition, although it is possible to think of a method of storing the remaining power in a storage and using it at a proper time according to the time, there is a problem that it is practically impossible in view of the technology or the cost for the construction and maintenance of the facility.

An object of the present invention is to provide a power transaction method for performing a power transaction between power consumption nodes in a cooperative consumption relationship, and an energy management system using the same.

As a technical means for achieving the above-described technical problem, the energy management system for power transactions with other power consumption node according to the first aspect of the present invention, the power information collection unit for collecting available power information, the other power consumption A power transaction setting unit configured to set a power transaction by transmitting and receiving a message including the available power information as a response to a request message for power purchase received from a node, and establishing a power transaction with the other power consumption node through the power transaction setting unit; And a voucher generation unit for generating a voucher for the established power transaction, a voucher issuing unit for issuing the generated voucher to the other power consumption node, and a database for storing the voucher issuing history. Contains unique ID and transaction power information of the other power consumption node.

In addition, the power transaction method between different power consumption nodes according to the second aspect of the present invention, receiving a request message for power purchase from the first power consumption node, a second power consumption node as a response to the request message; Transmitting a power information message comprising available power information of a; receiving an acceptance message from the first power consumption node informing of acceptance of a power purchase as a response to the power information message; Generating a voucher for establishing a transaction and issuing the generated voucher to the first power consumption node, wherein the voucher is a unique ID and transaction power of the first and second power consumption nodes. Contains information.

According to any one of the problem solving means of the present invention described above, it is possible to save the power produced unnecessarily, in particular, power consumers with different power consumption depending on the time can reduce the power consumption cost.

In addition, according to any one of the problem solving means of the present invention described above, the power service consumers do not only purchase power services one-to-one with the power service provider, but form a community group to purchase and share the power publicly Consumption can lead to decentralization of power demand, active participation of smart grid by consumers, and activation of power market.

In addition, according to any one of the above problem solving means of the present invention, anyone who knows the identity can obtain the public key, which reduces the communication load required to obtain the public key generated in the existing encryption process Not only does it save you the trouble of having to maintain the certificates you need to get the public key.

1 is a block diagram showing a smart grid network according to an embodiment of the present invention.
2 is a flowchart illustrating a power transaction method according to an embodiment of the present invention.
3 illustrates a voucher scheme for explaining a voucher generation process according to an embodiment of the present invention.
4 is a diagram showing a conventional industry-specific power consumption.
5A to 5D are diagrams for explaining a change in power consumption by industry when the voucher scheme according to an embodiment of the present invention is applied.
6 is a block diagram illustrating an energy management system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

1 is a block diagram showing a smart grid network according to an embodiment of the present invention.

The smart grid network includes a power service provider 20, a power service consumer 40, and a power service manager 60, as shown in FIG. 1.

Smart Grid refers to a power grid with enhanced communication network capabilities, helping to automate a whole series of processes from power generation to power consumption. In addition, the smart grid may enable two-way communication between the power service provider 20 and the power service consumer 40 to induce active smart grid participation of the power service consumer 40. For reference, the communication interface of the smart grid network may be implemented using RS485, Zigbee, PLC, WiFi or LAN.

The power service consumer 40 includes, for example, a home 42, an industrial institution 44, and a company, a research institute, and the like. Each power service consumer 40 may establish a power and communication network inside the facility. For example, the home 42 may establish a home area network to distribute power and collect used power information. The power service consumer 40 may receive power and power related information services directly from the power service provider 20 according to a contract with the power service provider 20.

In addition, individual power service consumers 40 use Energy Management Systems 43, 45, 53, 55. The energy management system 43, 45, 53, 55 communicates with home appliances in separate power and communication networks to determine whether to use the device according to the current electricity price. The power service provider 20 and other power service consumers It can also communicate with other domains such as distribution networks, distribution networks and transmission networks. Through the energy management system 43, 45, 53, 55, each power service consumer 40 may be provided with information related to power usage, and may actively participate in the smart grid network. In addition, the energy management system 43, 45, 53, 55 may perform monitoring and protection against security attacks on the smart grid network.

The power service consumer 40 according to one embodiment of the invention includes a cooperative demand organization 50. The cooperative demand agency 50 may be comprised of a collection of individual power consumption nodes 52, 54, which may be any type of individual power service consumer, including the home 42, the industry 44, and the like. Although only two power consumption nodes are included in the figure, more than one node may be included.

On the other hand, the management node 56 that manages the operation of each power consumption node may be included. The management node 56 includes a key management unit 57, and the key management unit 57 generates a secret key for each power consumption node and provides it to each power consumption node. The detailed operation of the key management unit 57 will be described later.

The cooperative demand agency 50 may not only be supplied with power under a direct contract with the power service provider 20, but may also be powered by establishing a power transaction contract with another power consumption node. For example, the first power consuming node 52 establishes a power transaction agreement with the second power consuming node 54 so that the second power consuming node 54 may receive monthly power from the power service provider 20. 100KW can be supplied instead. The power trading agreement may be specified at a timely date as needed.

The cooperative demand engine 50 according to an embodiment of the present invention has an advantage of reducing power consumption by diversifying power consumption, which will be described in detail below.

FIG. 2 is a flowchart illustrating a power transaction method according to an embodiment of the present invention, and FIG. 3 illustrates a voucher scheme for explaining a voucher generation process according to an embodiment of the present invention.

The power transaction method according to an embodiment of the present invention may be divided into a power transaction setup step (S100 to S140) and a voucher issuance step (S150 to S180). The power transaction setting step S100 to S140 may be executed by sending and receiving a message for setting a power transaction between the first and second power consumption nodes 52 and 54, and the voucher issuing step S150 to S180 may be performed to establish a power transaction. It can be executed by one side power consumption node as a certificate generation step according to the trader. In addition, the voucher issuing steps S150 to S180 will be described with reference to FIG. 3.

Before establishing a cooperative relationship, the key manager 57 may define a system parameter, a hash function, and a system master key to be used for encryption and decryption through a SETUP step. In addition, the key manager 57 may generate a public key and a secret key through an EXTRACT step. The public key may be generated based on a node's unique ID, email address, or IP address, and the secret key may be generated using the public key and the system master key. Such a secret key can be generated only by the key manager 57. In addition, the key management unit 57 must be secured physically and software. Each node's private key is distributed through a secure channel, or pre-ported before the node is installed. The public key can be generated as long as any node knows the identity of the other party, so no cumbersome distribution procedure is required and no cumbersome public key request step is required. The public key may be generated based on identity based information such as unique ID, email address or IP address of the power consuming node.

First, the first power consumption node transmits a request message to the second power consumption node (S100).

The first power consumption node 52 generates and sends a request message for power purchase to the second power consumption node 54. The request message may include a unique ID of the first power consumption node 52, an electronic signature, and required power amount information. In addition, the request message generated by the first power consuming node 52 may be broadcast to all nodes on the smart grid network as well as the second power consuming node 54.

Next, the second power consumption node collects available power information to generate a power information message (S110).

The second power consumption node 54 receives the request message from the first power consumption node 52 to collect available power information. In order to collect available power information, the second power consumption node 54 may first collect power information and then calculate the available power amount of the second power consumption node 54 based on the collected power information. The second power consumption node 54 may generate a power information message using the available power information, and the power information message further includes the unique ID and the electronic signature of the second power consumption node 54 as well as the available power information. can do.

Next, the second power consumption node transmits a power information message to the first power consumption node (S120), and the first power consumption node generates an acceptance message (S130).

The first power consumption node 52 may receive the power information message not only from the second power consumption node 54 but also from other power consumption nodes on the smart grid network. If the first power consumption node 52 selects the second power consumption node 54 as a power transaction target, the first power consumption node 52 sends an acceptance message informing the power purchase acceptance as a response to the power information message. Create The accept message may be encrypted using a unique ID or an electronic signature included in the power information message received from the second power consumption node 54.

Next, the first power consumption node transmits an acceptance message to the second power consumption node (S140).

This establishes a power transaction between the first and second power consumption nodes 52, 54.

Next, the second power consumption node generates a voucher (S150).

The second power consumption node 54 uses the hash chain value of the second power consumption node 54 and its own digital signature for the digital signature finally generated in the process of establishing a transaction through the CREATE step. Can be generated. The voucher may be generated based on the public key based on the identification information of the first power consumption node 52. At this time, the voucher uses the public key of the recipient of the voucher, so only the corresponding person can verify the voucher.

The generated voucher may include unique ID and transaction power information of the first and second power consumption nodes 52 and 54. In addition, the generated voucher may further include a hash chain value. The hashchain value may be used later in the voucher approval by the first power consumption node 52.

Next, the second power consumption node transmits the voucher to the first power consumption node (S160).

The second power consumption node 54 may issue the generated voucher to the first power consumption node 52.

Next, the first power consumption node approves the voucher (S170).

The first power consumption node 52 may check whether the voucher received through the ENSURE step is a normal voucher. The first power consumption node 52 may perform the approval step by using the secret key and the hash chain value.

Next, the first power consumption node transmits an acknowledgment message to the second power consumption node (S180).

When the voucher generated by the second power consumption node 54 is approved as a normal voucher, the first power consumption node 52 may send a grant message to the second power consumption node 54. When billing according to power usage, the second power consumption node 54 issuing a voucher reduces the charge corresponding to the transaction power amount, and the first power consumption node 52 receiving the voucher is the charge corresponding to the transaction power amount. This may be imposed additionally.

The electric power trading method according to an embodiment of the present invention may bring about a decentralization of electric power demand, active smart grid participation by consumers, and activation of electric power market by suggesting a new concept of consumer of cooperative demand institution or cooperative relationship. The consumer of the partnership is not a one-to-one power service for the power service consumer 40 but a one-to-one power service provider 20, but form a community group to purchase and share power in common.

The concept of a consumer in a partnership can be beneficial to consumers with different power consumption at different times. For example, manufacturer A, which produces mass production, will have higher power consumption in spring and summer, while manufacturer B, which produces gloves, will have higher winter consumption. If A and B form a cooperative consumer to buy power jointly, A can buy power shortage from B in summer. Because B consumes a relatively small amount of power during the summer, he can sell some of the power he doesn't use but decides to buy. In this case, A and B may perform the power transaction method according to the present embodiment to execute the power transaction.

It is possible to save power generated unnecessarily due to the consumer of the power transaction method and the cooperative relationship according to an embodiment of the present invention. In addition, the effects of the power transaction will be additionally described with reference to FIGS. 4 and 5A to 5D.

In addition, the power transaction method according to an embodiment of the present invention may perform encryption and decryption for security of the voucher including the monetary information.

The voucher contains monetary information and therefore would like to be targeted. Vouchers can apply an identity (ID) based encryption scheme to prevent attacks such as tampering and forgery from attackers. Identity-based encryption is a type of public key cryptography, in which a public key is created using the identity of a trader. The identity of the trader's unique ID, email address or IP address can be used as the public key, and anyone who knows the identity can obtain the public key. This not only reduces the communication load required to obtain the public key generated in the existing encryption process, but also reduces the trouble of maintaining the certificate required to obtain the public key.

4 is a diagram illustrating a conventional industry-specific power consumption, Figures 5a to 5d is a view for explaining the change in power consumption by industry when applying the voucher scheme according to an embodiment of the present invention.

FIG. 4 is a data surveyed by Korea Electric Power Corporation (KEPCO), which is food, fiber, basic mental, machinery, and acoustic image. Sound, Image, Motor, Furniture, and Recycling industries. 4 has been reduced to a ratio of 3000 in accordance with current pricing and experimentation. For reference, currently, KEPCO's pricing policy is 4 ~ 300kW, 300kW ~ 1000kW, 1000kW or more, and the pricing is differentiated according to the amount of electricity, and when contracting with a high amount of electricity, higher price per unit power is to be paid. have.

5A to 5D show an experimental result of whether a monetary benefit is generated according to the application of the voucher scheme. The amount of power to be paid to KEPCO before and after the application of the voucher scheme is shown in dollar terms.

The experiments consisted of textiles and furniture, sound / image and food, basic mentality and recycling, and machines and automobiles in cooperative consumption relations with each other. As a result, it can be seen that although there is a difference in each industry, a monetary benefit is obtained when a relatively voucher scheme is used.

In applying the voucher scheme, all participants who form a cooperative consumption relationship can receive high financial benefits.

6 is a block diagram illustrating an energy management system according to an embodiment of the present invention.

The energy management system 100 according to an embodiment of the present invention is a system for power transaction between different power consumption nodes, and may be included in one power consumption node.

Referring to FIG. 6, the energy management system 100 includes a power information collecting unit 110, a power transaction setting unit 120, a voucher generating unit 130, a public key generating unit 132, and a voucher issuing unit 140. , The smart meter unit 150 and the database 160.

The power information collecting unit 110 may collect available power information of the power consumption node to which the energy management system 100 belongs.

The power transaction setting unit 120 transmits and receives a message including available power information as a response to a request message for purchasing power received from another power consumption node, and sets the power transaction. To this end, the power transaction setting unit 120 transmits and receives a message for setting a power transaction with another power consumption node.

The power transaction setting unit 120 transmits a power information message including the power information collected by the message receiving unit 122 and the power information collecting unit 110 to receive a request message for power purchase from another power consumption node. The message transmitter 124 may be included. In addition, the message receiver 122 may further receive an acceptance message for accepting the power transaction setup from another power consumption node.

When the power transaction setting unit 120 receives a request message for power purchase from another power consumption node, the power information collecting unit 110 may collect available power information. The power information message may be generated using the power information collected by the power information collecting unit 110 and then transmitted by the power transaction setting unit 120 to another power consumption node. Thereafter, the power transaction setting unit 120 receives the acceptance message from another power consumption node, thereby establishing the power transaction.

The request message may include a unique ID, an electronic signature, and required power amount information of another power consumption node, and the power information message may include a unique ID, an electronic signature, and available power information of one power consumption node. In addition, the acceptance message may be encrypted using a unique ID or an electronic signature received from one power consumption node.

The voucher generation unit 130 generates a voucher for establishing a power transaction according to the transmission and reception of a message by the power transaction setting unit 120.

The public key generation unit 132 generates a public key based on the identity based information of another power consumption node. In this case, the public key may be generated based on a unique ID, an email address, or an IP address of another power consumption node.

The voucher generation unit 130 generates the voucher using the public key received from the public key generation unit 132. In addition, the voucher may include unique ID and transaction power information of another power consumption node.

The voucher issuer 140 issues the voucher generated by the voucher generator 130 to another power consumption node. The voucher issuance history may be stored in the database 160. The voucher issuing history may include power transaction information such as power consumption node information, power transaction volume, and power transaction time participating in the power transaction. The issued voucher may be approved by another power consuming node based on the secret key, and the secret key may be generated by the management node 56 using the public key.

The smart meter unit 150 calculates power usage state information for one power consumption node. In addition, the smart meter unit 150 may calculate the power usage state information based on the voucher issuance history stored in the database 160. For example, if the voucher issuance details include information that sells about 100KW of electricity every month from July to December with other power consumption nodes, the smart meter unit 150 may calculate power usage state information by reflecting this. have.

In addition, when the smart meter unit 150 charges a fee based on the voucher issuance history, the power consumption node that issued the voucher cuts a fee corresponding to the transaction power amount, and the power consumption node that receives the voucher trades. The fee corresponding to the amount of power may be calculated to be additionally charged.

For reference, the components illustrated in FIG. 6 according to an embodiment of the present invention mean software components or hardware components such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and perform predetermined roles. .

However, 'components' are not meant to be limited to software or hardware, and each component may be configured to be in an addressable storage medium or may be configured to reproduce one or more processors.

Thus, as an example, a component may include components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, and subs. Routines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables.

Components and the functionality provided within those components may be combined into a smaller number of components or further separated into additional components.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

20: power service provider 40: power service consumer
50: cooperative demand agency 52: first power consumption node
54: second power consumption node 60: power service manager
100: energy management system 110: power information collection unit
120: power transaction setting unit 122: message receiving unit
124: message transmission unit 130: voucher generation unit
140: voucher issuing unit 150: smart meter unit
160: database

Claims (15)

In the energy management system for power transactions with other power consumption nodes,
A power information collecting unit for collecting available power information;
A power transaction setting unit configured to set a power transaction by transmitting and receiving a message including the available power information as a response to a request message for purchasing power received from the other power consumption node;
A voucher generation unit generating a voucher for the established power transaction when establishing a power transaction with the other power consumption node through the power transaction setting unit;
A voucher issuing unit for issuing the generated voucher to the other power consumption node;
Including a database for storing the voucher issuance history,
The voucher includes a unique ID and transaction power information of the other power consumption node.
The method of claim 1,
The power transaction setting unit,
A message receiver for receiving a request message for power purchase from the other power consumption node;
A message transmitter for transmitting a power information message including power information collected by the power information collector
Energy management system comprising a.
The method of claim 1,
Further comprising a public key generation unit for generating a public key based on the identification information of the other power consumption node,
The voucher generation unit generates the voucher using the public key.
The method of claim 3, wherein
The public key is generated based on the unique ID, email address or IP address of the other power consumption node.
The method of claim 4, wherein
And the issued voucher is approved by the other power consuming node based on a secret key.
The method of claim 1,
Further comprising a smart meter unit for calculating the power use status information,
The smart meter unit calculates power usage state information based on the voucher issuance history stored in the database.
In the power transaction method between different power consumption nodes,
Receiving a request message for purchasing power from a first power consuming node,
Transmitting a power information message comprising available power information of a second power consumption node as a response to the request message;
Receiving an accept message from the first power consuming node informing of a power purchase acceptance in response to the power information message,
Generating a voucher for establishing a power transaction upon receipt of the acceptance message; and
Issuing the generated voucher to the first power consumption node;
And the voucher includes unique ID and transaction power information of the first and second power consumption nodes.
The method of claim 7, wherein
And the request message includes a unique ID, an electronic signature, and required power amount information of the first power consumption node.
The method of claim 7, wherein
The power information message includes a unique ID, an electronic signature, and available power information of the second power consumption node.
The method of claim 9,
The step of transmitting the power information message,
Collecting power information for the second power consumption node; and
Calculating the presence or absence of available power of the second power consumption node or the amount of available power based on the collected information;
Power trading method comprising a.
The method of claim 9,
And the acceptance message is encrypted using a unique ID or an electronic signature received from the second power consumption node.
The method of claim 7, wherein
Generating the voucher,
Generating a public key based on identity information of the first power consumption node; and
Generating the voucher using the public key
Power trading method comprising a.
13. The method of claim 12,
And the public key is generated based on a unique ID, an email address, or an IP address of the first power consumption node.
13. The method of claim 12,
And the issued voucher is approved by the first power consuming node based on a secret key.
15. The method of claim 14,
The voucher further includes a hash chain value,
Wherein the hashchain value is used upon approval of the voucher by the first power consuming node.

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