KR101991759B1 - Control Method for Energy Trading in Smart-grid - Google Patents

Abstract

The present invention relates to a method for controlling distributed power transactions in a distribution network around a power grid with surplus power and, more specifically, to a method where a control system of each power grid measures and calculates consumption power, generation power, and energy storage device storage capacities in each power grid in real time to transmit the consumption power, the generation power, and the energy storage device storage capacities to other power grids in a smart grid distribution network including two or more power grids divided by including one or more distributed power sources and one or more energy storage devices, and aggregates real-time situations received from other power grids and a real-time situation of the power grid to which the control system belongs to supply surplus power to the distribution network or receive power from the distribution network to store power in an energy storage device of the control system. A second power grid having a storable space, namely storable power in an energy storage device is found by a power grid having generation power larger than the sum of consumption power and storable power, namely a first power grid having surplus power, and then the surplus power is supplied and stored in real time via the distribution network.

Description

[0001] The present invention relates to a control method for a distributed power trading system,

The present invention relates to a control method for a distributed power trading of a power network centering on a power grid having surplus power in a smart grid transmission forecast. In more detail, in a Smart Grid transmission view that includes two or more compartmented power grids that include one or more distributed power sources and / or one or more energy storage devices, a control system for each power grid is used to determine the power consumption , Power generation and storage capacity of the energy storage device are measured and calculated in real time and transmitted to other power networks, and the surplus power is supplied to the transmission forecast by synthesizing the real-time statuses received from other power networks and the real- Or conversely, to a method of receiving power from a transmission view and storing the power in its own energy storage device. In other words, the present invention provides a method for power trading among power grids by controlling the distributed power source or the energy storage device on a power network basis on the basis of real-time data for each power network to supply or receive power to the power grid.

The present invention relates to a method and apparatus for sharing and trading a surplus power consumed in a power grid of a power grid including a smart grid or a micro grid from among various types of distributed power sources generated by renewable energy or other methods This is about technology that maximizes the utilization of energy resources by providing a base that can be used.

Generally, energy utilities such as electricity and gas are being distributed to consumers in real time by supply companies with exclusive distribution rights to specific regions. These energies are stricter in their supply method, especially in the case of electricity, because they are consumed in real time by the facilities connected to the power network or are not stored in real time in the energy storage facility. Therefore, As soon as power is generated, it must be supplied in such a way that it can be utilized as efficiently as possible.

Recently, the concept of distributed power sources has been introduced for efficient production and use of energy. Distributed power generation is a small-scale power generation facility that can be distributed in the vicinity of a power consumption site, unlike a large-scale centralized power source such as a nuclear power plant or a thermal power plant. The power generation facility using new energy or renewable energy, as well as diesel and gas Traditional private power generation facilities may also be included. Here, new energy is a new energy resource different from conventional fossil fuel energy, such as fuel cell and hydrogen energy. And renewable energy is the energy that transforms the natural resources such as light, heat, wind, and water from the sun into usable energy. It means solar energy, solar energy, bio, wind, hydro, ocean, have. In addition to the emergence of such renewable energy, development of techniques for installing and operating distributed power sources for efficient utilization of power resources is being promoted. The introduction of distributed power sources has led to many changes in the grid grid system, which allows power consumers to choose between distributed and power sources in view of price and other conditions in power consumption, By using a distributed power source, it is possible to improve the efficiency of the power industry.

However, as described above, many of the distributed power sources mainly use renewable energy using natural resources such as wind power, solar power, tidal force, and wave power, and the generated output is totally dependent on natural phenomena It is difficult to utilize it effectively. For example, because the wind, the source of wind power, is not always constant, the power from wind turbines fluctuates. In the case of photovoltaic power generation, the output power also changes unstably depending on the time zone, the amount of sunshine, or the amount of sunshine according to precipitation and snowfall. In order to use the distributed power sources which can change the power generation at every moment more efficiently, a control system for management and transaction is indispensably required.

On the other hand, technologies and applications for Energy Storage System (ESS) are increasingly diffused as a concept separate from distributed power supply or as a device for improving the efficiency of distributed power supply. The energy storage device charges electric power generated from a generator or electric power supplied from a power system, and discharges the electric power when a large amount of power such as a power peak time period is needed. In other words, if the electric power is charged to the energy storage device during the low-price electric power time period and the electric power charged in the energy storage device is discharged during the high electric power power time period, economical benefit can be obtained. In addition, It is possible to reduce the cost due to the construction and operation of the power plant and to prevent environmental pollution. ESS can be used to easily manage the load even at the peak of the power. When combined with the renewable energy distributed power source, the power of the distributed power source can be constantly supplied. I can do it. A typical energy storage device is a battery-powered ESS. The battery-based ESS includes a battery to store electricity, and a related configuration such as a Power Conditioning System (PCS), an Energy Management System (EMS), and a Battery Management System (BMS) to efficiently manage the battery.

As the demand for electricity from industrial development increases year by year, and the amount of electricity used in each customer is also continuously increasing, it takes a lot of budget to construct electric power production facility or power plant. In addition to promoting the installation of renewable energy generation facilities, policies are being continuously promoted to encourage and support the installation of distributed power sources and ESSs to various consumers such as individual houses, apartment houses, office spaces, and factory facilities. However, the cost of deploying distributed power and ESS is high, and because the required configurations are diverse and complex, it is a great burden to install and manage distributed power sources or ESSs for the customer. Above all, the distributed power source and the ESS differ in power consumption and usage pattern depending on the characteristics of the installation site and location, and there is a problem that the energy utilization and saving effect after the construction must be managed so as to be maximized. For Ghana's small-scale power generation companies, it is necessary to be able to utilize the power generated from distributed power source and ESS as much as possible, and the entire resources should be managed as efficiently as possible in the region or country.

In order to overcome these problems, a smart grid and a micro grid technology capable of power trading within a power grid have been developed and various attempts have been made between a small power producer such as a distributed power source and a power consumer consuming it. In other words, a consumer owns a distributed power source such as a photovoltaic power generation facility, uses a distributed power source for the power consumption of his facilities, and sells the remaining power to other consumers through a power grid, There are also small-scale power generation companies that install and operate distributed power sources such as photovoltaic power generation and wind power generation for sales purpose only. However, even if the power trading is performed through the power grid, the manager of the power grid can only sell in a desired time zone and manner, and a direct deal between the producer and the consumer is not practically impossible. Even if the direct trade is possible, There is a problem that a lot of wasted power is wasted at that time when viewed from a real-time viewpoint. In addition, since it is a centralized transaction that puts a transaction system in the middle, a separate transaction system must be constructed and operated. In addition, a lot of computing resources are required in accordance with the increase in security issues and data amount due to the complicated transaction processing. In particular, power trading among individual objects within a power grid may be easy, but when viewed from the overall standpoint of each grid, generation power remains in one grid due to power generation capacity, power consumption, and storage space imbalance, There is an imbalance such as the storage space of the device, so it is urgent to develop a technology for balanced power generation, consumption and storage of the power grid.

The present invention provides a method for controlling distributed power trading based on a power grid having surplus power according to the present invention, which is developed to solve the problems described above, (KW, MW) larger than the sum of the power consumption (KW, MW) of the first power supply unit (KW, MW) (KW, MW), that is, a second power network having a free space that can be stored in the energy storage device, and then supplies and stores surplus power in real time through transmission and distribution.

Here, the real-time supply of the surplus power means that the second power network having the storage power reserve for the same time that the surplus power is supplied from the first power network having the surplus power to the transmission / And the energy is stored in the energy storage device. The transmission power is offset from the power supplied and the supplied power. The first power network and the second power network have the same effect as that of power transmission and reception .

It is still another object of the present invention to provide a method and system for providing a surplus power in real time through a transmission power forecasting system of a first power grid, Distributed power trading, in which power is supplied from one side and power is supplied and stored at the same time, through the exchange of information and determination between the power networks, without having a centralized transaction system, a control system or a mediation system. And a method of supplying the same.

It is a further object of the present invention to provide a method and system for transmitting a proposal request signal from a power grid having a storage margin power after sending a proposal request signal to a second power grid which is a power grid having a storage margin power centered by a first power grid, And to select a second power network for storing surplus power, thereby providing a method of maximizing the surplus power in a case where the storage power margin is larger than the surplus power when the entire transmission power perspective is viewed.

It is still another object of the present invention to provide a system and method for providing a surplus power to a first power grid in real time through a transmission / The surplus power can be supplied to and stored in a plurality of the second power networks. On the other hand, if the power stored in the energy storage device in one second power network is supplied from one first power network When the surplus power alone can not be satisfied, it is possible to supply power to a plurality of first power grids.

It is a further object of the present invention to provide a method and system for providing a first power network with real power fluctuation information about a power supply to a second power network in supplying and storing surplus power to a second power grid through transmission / Which is stored in an energy storage device of a second power grid only by the amount of power supplied from the first power grid.

It is a further object of the present invention to provide a method and system for a first power grid to select a second power grid to store surplus power in an energy storage device, It is aimed to provide a method of selecting a second power grid by setting strategic priorities such as a power grid.

It is a further object of the present invention to provide a method and system for supplying surplus power of a first power network to an energy storage device of a second power network by supplying a predetermined time or a first time for a relatively short period of time, Thereby minimizing the fluctuation of surplus power that can be generated due to the change in the operating conditions of the first and second power grids. On the contrary, by presenting a method of continuously connecting the power grids connected to the first power grid and the second power grid immediately before the end of the first time, And a method for stably supplying power to each other for a long period of time.

It is still another object of the present invention to provide a new power supply system capable of supplying an additional increased surplus power when the surplus power of the first power grid is generated during the supply of surplus power from the first power grid to the energy storage apparatus of the second power grid. And to provide a method of searching for a second power network and further supplying an increased surplus power.

Yet another object of the present invention is to provide a method of additionally storing surplus power from a new first power network and further storing the surplus power from a new first power grid when there is room in the storage space in the second power grid being supplied with surplus power from the first power grid And to provide the above objects.

Yet another object of the present invention is to provide a system and method for providing redundant power from a first power grid to an energy storage system of a second grid, It is an object of the present invention to provide a method for enabling a new first power grid to sufficiently supply new power in a second power grid where supply power is insufficient.

It is a further object of the present invention to prevent forgery and falsification of transmission data by including a hash value having been hashed between the first power grid and the second power grid in a signal to be exchanged, The authentication signal including the hash value encrypted with the private key of the sender is included in the signal and the receiver decrypts the authentication signal with the public key of the sender, And the like.

In order to achieve the above object, a preferred embodiment of the present invention provides a smart grid transmission system including at least two distributed power sources and / or at least one energy storage device, A method of controlling a distributed power supply and an energy storage device for each of the control systems to trade power on the basis of real-time measurements, comprising the steps of: in each grid, generating power, A first step of measuring, in real time, a second stored power, which is power consumed as power consumed, a first stored power, which is power stored in the own energy storage device, and a second stored power, ; Calculating a surplus power that can be supplied to the other power network among the generated power or each of the storage power that can be stored in the energy storage device by receiving the surplus power from another power network, Wherein the magnitude of the power is calculated according to the generated power, the power consumption, and the first stored power, and the magnitude of the stored free power is calculated based on the generated power, the power consumption, the first stored power, A second step of calculating power according to the surplus power supplied from another power network; A first power network having one of the surplus power and a time for which the surplus power is continuously supplied to the other power network is determined to be a first time, To the respective power grids in a proposal request signal; And a control unit that verifies the proposal request signal in the power network having the storage margin power among the power networks having received the proposal request signal, calculates a power that can be continuously stored in the energy storage apparatus for the first time, A fourth step of storing the storage proposal including the own identification code and the storage limit in a storage suggestion signal and transmitting the stored proposal to the first power network; Selecting one of the first and second power grids as a second power grid to supply the surplus power to at least one of the power grids transmitting the stored proposal signal in the first power grid, A fifth acceptance request including a limit, a first time, and a start time of the first time in a proposed acceptance signal and transmitting the acceptance consent to each of the second power grids; A sixth step of receiving, in the second power network, an acknowledgment including an own supply limit by the proposed consent order, the first time and the start time, in an acknowledgment signal, and transmitting the reception acknowledgment to the first power network; Wherein the first power network verifies the receipt acknowledgment signal and then supplies the surplus power to the transmission / reception outlook during the first time from the start time to obtain real-time fluctuation information of the supply limit according to the fluctuation of the surplus power And generating and transmitting the generated power to the second power network; An eighth step of receiving power from the transmission / reception outlook for the first time from the start time in the second power network and storing the power in its own energy storage device according to the real time fluctuation information; And in the first power network and the second power network, performing the first through sixth steps from a certain point in time before the end of the first time to the end of the first time in the first power network and the second power network, A ninth step of performing the seventh step and the eighth step again when finished; Wherein the ninth step is repeated as long as the first power grid can supply the surplus power, and in the fifth step, which is repeated by the ninth step, the start time is repeated immediately before Wherein the surplus power of the first power grid in the second step is the same as the end time of the first time determined in the third step, 2 is a value calculated after subtracting the surplus power from the power supply to the power grid, and ??? in the second step, which is repeated by the ninth step, the storage power margin of the second power grid is Wherein the distributed power control is controlled based on a power grid having surplus power, the power being supplied from the first power network to the storage power margin, .

Further, in addition to the above-mentioned features, the calculation of the surplus power and the storage allowance power in the second step may include: - a power grid without an energy storage device and with a distributed power source, the generated power being greater than the power consumption, There is a distributed power source and an energy storage device, wherein the first stored power and the second stored power are absent and the generated power is greater than the consumed power, or there is a distributed power source and an energy storage device, In the case of a power grid in which the generated power is larger than the power consumption and the first storage power is smaller than the difference between the generated power and the consumed power, the power grid has a surplus power of the following size,

* Surplus power = (Generation power - Power consumption) - First storage power

- a distributed power source and an energy storage device, and wherein the first stored power and / or the second stored power is a power grid without a distributed power source and an energy storage device, the first stored power and / Wherein the generated power is greater than the consumed power and the generated power is greater than the consumed power and the stored power and the energy storage are present, In the case of a power network in which the power difference is equal to or less than the first storage power, the power grid has a storage margin power of the following size,

* Storage power reserve = First storage power + Second storage power - (Generated power - Power consumption) - Surplus power supplied from other power grid

And the remaining power network is a power network that does not have the surplus power and the reserved spare power, it is also preferable that the distributed power trading is controlled based on the power grid having the surplus power.

In addition to the above-mentioned features, each of the control systems includes respective priority information for selecting the second power network when the power network to which it belongs becomes the first power network, and in the fifth step (N is an integer equal to or greater than 1) sequentially from a power network having a higher priority according to the priority information when the first power grid selects the second power grid, And the supply limit for each of the second power networks defined by the first power network is as follows,

- the (n-1) th second power grid supply limit = the respective storage limit

- nth second power grid supply limit = surplus power - (sum of n-1th supply limits)

Wherein the real-time variation information generated by the first power grid is a real-time variation value of the supply limit for each of the second power grids in the seventh step, and when the surplus power is reduced, And increasing the surplus power in ascending order if the surplus power is increased. In the fifth step, which is repeated by the ninth step, when the first power grid selects the second power grid, Despite the priority information, it is also preferable to use a method of controlling the distributed power trading in the transmission / distribution view centering on the power network having the surplus power, further including a feature of selecting the second power network that was selected immediately before .

In another embodiment of the present invention, in addition to all of the above-described features, in the eighth step, the second power grid maintains a state in which the supply limit by the real-time fluctuation information is reduced to a predetermined size or less for a second time The method further comprising: sending a cancellation signal to the first power network and stopping power storage for the energy storage device from the transmission power perspective, It is also possible to use a method of controlling power trading.

In addition, each of the control systems includes a private key and a public key for each control system of the other power network, and the proposal request signal includes a first hash value obtained by hashing the proposal request, Further comprising a first authentication code obtained by encrypting the second hash value including the first hash value with the first hash value and the second hash value with the private key of the first power network, The hash value including the first hash value in the proposal request and the value obtained by decoding the first authentication code with the public key of the first power network are compared with each other and verified, The second hash value and the third hash value including the second hash value in the storage proposal, and the proposed acceptance signal includes the third hash value and the third hash value, The fourth hash value including the hash value, and the acknowledgment signal further includes a fifth hash value including the fourth hash value, the fourth hash value including the fourth hash value, the fifth hash value including the fourth hash value, Further comprising a second authentication code obtained by encrypting the hash value with a private key of a second power network transmitting the acknowledgment signal, and wherein the verification of the acknowledgment signal includes hashing the fourth acknowledgment including the fourth hash value And comparing the second authentication code with a value obtained by decoding the second authentication code with the public key of the second power network that transmitted the acknowledgment signal, and verifies and verifies the second authentication code. In the third step performed by repeating the ninth step , And the first hash value included in the proposal request signal is the fifth hash value. A method of controlling distributed power trading on a transmission power forecast centered on a power grid having surplus power It is preferred.

As described above, according to the present invention, a method for controlling a distributed power trading in a transmission power forecast centered on a power grid having surplus power is based on real-time data for each power grid, Not only the first power network having surplus power and the second power network having a spare space that can be stored in the energy storage device but also the magnitude of the surplus power of the first power networks and the storage power margin of the second power network And the first power grid can search for the second power grid and supply and store the surplus power in real time through the transmission and observation view. Therefore, if the generated power of the distributed power source exceeds the power consumption in the grid, surplus power stored in the energy storage device of the own network can be sent to the energy storage device of another power network, And it is possible to deal with other power and power network units for the power that is left and traded through the internal trading system in one power network.

As a result, while the power generated compared to the consumption amount is large in the power network (the first power grid) in which the energy storage device is lacking, the generation power is insufficient compared to the consumption amount, while the power is transferred to the power grid It is possible to solve the consumption and storage imbalance between the power networks, thereby maximizing utilization of the generated power of the distributed power source. In other words, by sharing surplus power between power grids and sharing storage space, it is possible to minimize surplus power in the whole power network and minimize empty storage space, thereby maximizing energy utilization and minimizing facility investment . Also, it is advantageous to construct a distributed power source at a low cost because it can use the ESSs remaining in other power grids as much as possible even if the capacity of ESS for distributed power sources for supplying distributed power is slightly reduced in constructing distributed power sources.

In addition, the present invention provides a proposal request signal to a second power network, which is a power network having a storage power margin, centered by a first power network, which is a power network having surplus power, and then receives a storage proposal signal from power grids having storage power reserve The second power network for storing the surplus power is selected. Therefore, when there is a large storage space that is empty compared to the surplus power, the surplus power can be saved as much as possible. This is because the power network with surplus power is used as a center to find a power grid having an empty storage space to secure a sufficient storage space, and then a method of storing the surplus power of the power grid as much as possible in accordance with the real time fluctuation information is used.

In addition, since the first power grid stores the surplus power in the second power grid, the surplus power can be stored only for the first time corresponding to the distributed power generation status and the load characteristics for a relatively short period of time. It is possible to efficiently store and distribute the time according to the load characteristics and to measure the current generation status of surplus power in real time so that it can be reflected from time to time so that it can be actively applied to the generation characteristics of the renewable energy dispersed power source such as solar power, There is an effect that it can be coped with. Here, the first time may be set to a long time such as one hour or two hours in a time zone where the power generation output and power consumption do not fluctuate, but it may be set to a very short time such as five minutes or ten minutes in an unstable time zone, It is possible to store the surplus power remaining under any circumstances as much as possible.

In addition, the first power network again selects the second power network to prepare for the supply of the surplus power, and the second power network is set to the new power network at the end of the first time, which is immediately before the end of the first time, When the second power grid is selected after the first time has ended, the second power grid that was supplied immediately prior to the second power grid is preferentially selected. Therefore, even if the surplus power or the storage standby power fluctuates somewhat, It is possible to supply electricity constantly from the power grid to the second power grid stably. Even if the first time is shortened in preparation for the fluctuation of the surplus power, the connection state between the first power grid and the second power grid can be continuously continued.

When the surplus power can not be stored in one second power grid in the first power grid, the surplus power may be supplied to the second power grid through the transmission / Therefore, it is possible to maximize the storage capacity even when the free space of the energy storage device occurs in each power network, so that the utilization of the energy storage device in each power network can be maximized.

In addition, since the first power grid and the second power grid are used to transmit and receive the redundant power, the surplus power and the storage redundant power can be continuously calculated, and the proposal request signal and the storage suggestion signal can be exchanged When the surplus power increases during the supply of surplus power by the first power network, it is possible not only to send an additional proposal request signal to the power network other than the second power network currently supplied, If there is a storage extra in the energy storage device, the new first power network may receive an additional request request signal. If there is a disruption in the storage of the energy storage device of the second power network due to the reduction of surplus power of the first power network, By sending a cancellation signal at the power network, the second power network is switched from the new first power network to the new It is possible to actively respond to the surplus power fluctuation status in real time.

In addition, in the case of the first power network, the second power network, which receives surplus power according to the surplus power fluctuation, can be flexibly added in real time. In the second power network, It is possible to maximize the production power of the distributed power source, maximize the utilization of the energy storage device, and maximize the amount of the power transaction, by canceling the supply from the current first power network and changing it to the other first power network, Ultimately, it has the effect of maximizing energy utilization efficiency.

In addition, since it shares or trades based on real-time measurement data instead of sharing or trading based on predicted data on generated power or power consumption, it can accurately measure the surplus power in real time for the first power network, It is possible to save the surplus power without leaving out the surplus power. Thus, it is possible to save the surplus power without leaving the residual power, There is an effect to provide.

Each control system also includes priority information for selecting a second power network when the power network to which it belongs is the first power network. When the first power network selects the second power network, priority information , It is necessary to prioritize them according to the strategic cooperation between the stations in the order of lower storage cost or shorter distance or power grid, for example, There is an effect that the second power network can be selected in such a manner as to give priority to the second power network.

In addition, since the distributed power supply and the energy storage device are shared between each power grid, it is possible to utilize the energy storage device of another power grid without installing additional energy storage device in the power grid, which is an excess power of distributed power, There is an effect that power can be efficiently stored in the storage device.

In addition to centralized power exchange, it is possible to supply power through direct request and acceptance between each grid control system, so that it is possible to directly deal with power grid power without the inter-grid interconnection system, Therefore, there is an advantage that the power can be traded without a separate power trading system.

In addition, the signals transmitted between the first and second power grids, that is, the proposal request signal, the proposal signal, etc., include not only the hash value hashing the content, but also the hash value including the previous hash value Since the transmitted and received signals are connected to each other through the hash value, it is impossible to forge or change the signal, and in order to forge or falsify a signal value, all signals exchanged between the first and second power grids must be corrected. It is possible to enhance the transaction stability between the trading partners even if the power manganese direct transaction is carried out.

In addition, the proposal request signal corresponding to the first signal among the signals connected to each other by the hash value includes a first authentication code in which the hash value is encrypted with the private key of the first power network, and decrypted with the public key of the first power grid in the second power network And a second authentication code obtained by encrypting the hash value with the private key of the second power network is included in the acknowledgment signal corresponding to the final signal so as to be decrypted and verified by the public key of the second power grid in the first power grid, There is an effect that stabilization of the electric power trading between the power networks can be achieved by providing the means for verification and non-repudiation of the electric power amount.

That is, according to the present invention, the signals exchanged between the first power network and the second power network, that is, the plurality of transactions for one transaction are mutually connected to each other through the hash value, and the initial signal and the final signal are transmitted to the sender's private key It is possible to prevent forgery and falsification of signals exchanged between the first power network and the second power network by decrypting the authentication code obtained by encrypting the hash value with the public key of the sender by verifying the authentication code, It is possible to greatly enhance the stabilization and reliability of the power network electric power trading, and even if only the initial signal and the final signal are encrypted without encrypting all the signals, since the intermediate signals are coupled to each other through the hash codes, Enhance security without burdening encryption during signal generation and transmission .

1 is a configuration diagram showing a system to which the present invention is applied.
2 is a flow chart illustrating a method and procedure flow for determining a first power network having surplus power and a second power network having storage power reserve in the present invention.
Fig. 3 shows a calculation table for explaining an algorithm for calculating the magnitudes of the determination of the first and second power grids and the magnitude of the surplus power and the storage power margin in the present invention.
Fig. 4 illustrates a procedure flow in the present invention in which a first power grid selects a second power grid to supply surplus power, and a second power grid stores surplus power to be supplied.
5 illustrates a flow of a procedure in which a first power grid selects a second power grid in the present invention.
FIG. 6 illustrates a procedure flow in the present invention in which a second power network having a storage limit greater than a supply limit proposes storage for a new first power network.
7 is a flowchart illustrating a procedure for transmitting a cancellation signal to a first power grid in a second power grid with reduced power supply in the present invention.
FIG. 8 illustrates a procedure flow including a structure for a signal transmitted / received between a first power network and a second power network in the present invention.

Hereinafter, the present invention will be described in detail in order to clarify the objects and features described above, and those skilled in the art will readily understand the technical idea of the present invention. In describing the present invention, it is to be understood that any known technology related to the present invention has already been known in the art, and if a detailed description of the known technology is considered to unnecessarily obscure the gist of the present invention, It will be omitted.

In addition, although the term used in the present invention is selected as a general term that is widely used at present, there are some terms selected arbitrarily by the applicant in a specific case. In this case, since the meaning is described in detail in the description of the relevant invention, It is to be understood that the present invention should be grasped as a meaning of a term that is not a name of the present invention. The terminology used in the description of the embodiments is used only to describe a specific embodiment, and is not intended to limit the embodiments. The singular expressions include plural expressions unless the context clearly dictates otherwise.

The embodiments are capable of various modifications and may have various additional embodiments, in which specific embodiments are shown in the drawings and are described in further detail in connection with the drawings. It should be understood, however, that the embodiments are not intended to be limited to the particular forms, but are to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the embodiments.

The expressions "first", "second", "first" or "second" among the descriptions of various embodiments can modify various elements of the embodiments, but do not limit the elements. For example, the representations do not limit the order and / or importance of the components. The representations may be used to distinguish one component from another.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a block diagram illustrating a system to which a method of controlling distributed power trading is applied to a power grid having surplus power according to the present invention. As shown in FIG. 1, the present invention includes one or more distributed power sources 120, or one or more energy storage devices 130, or one or more distributed It is desirable to apply to a smart grid transmission view that includes a power grid 100 that is partitioned to include both a power source 120 and one or more energy storage devices 130. In the present invention, each control system 101 included in each power grid 100 calculates the power consumption (KW, MW) for its own power network, the generated power (KW, MW) And the energy storage device 130 included in the own power network 100 and the distributed power (KW, MW) of the energy storage device included in the power network 100 based on the real- It is preferable to control the power source 120. [ Here, each of the power grids 100 is preferably a smart grid or a micro grid power grid capable of remotely measuring the generation and use of electric power of an accommodation or an electric power facility by a smart meter or the like, and transmitting the electric power to the control system 101 or the like. It is preferable that the power grid 100 is connected to each other with a structure for receiving or supplying power through the transmission /

As described above, each of the power networks 100 may include the load facility 110 and the distributed power source 120, and may include only the load facility 110 and the energy storage device 130 Or both the load facility 110, the distributed power source 120, and the energy storage device 130. It is of course possible to include a power grid having only the distributed power source 120 or the energy storage device 130 without a load facility. In the case of the power network 100 including only the load facility 110 and the distributed power source 120, the generated power generated by the distributed power source 120 is completely consumed in the load facility 110 in the power grid 100 However, there are cases in which it is not completely consumed depending on time zones or temporary conditions. In some cases, the generated power generated by the distributed power source 120 may be greater than the maximum power consumed by the power grid 100. Therefore, there may be a variety of cases where surplus power is generated in the generated power generated by the distributed power source 120.

On the other hand, in the case where only the energy storage device 130 is included in the grid 100 in addition to the load facility 110, peak power management is performed such that the commercial power is charged at a time when the commercial power is low, Or for arbitrage trading. However, since there is no distributed power source 120 inside the power grid, it is not possible to use renewable energy generation power which can be supplied at a low cost, and it is necessary to charge using a low-price time zone of a commercial power source. The energy storage device 130 may not be fully charged depending on the situation or conditions of the power network, and a margin may be generated in the storage space of the energy storage device 130. As a result, the energy storage device 130 may not be fully utilized .

Also, in the case where both the distributed power source 120 and the energy storage device 130 are included in the power grid 100 together with the load facility 110, the generated power generated by the distributed power source 120 is supplied to the load facility May be used in the energy storage unit 110. In some cases, spare power is generated because the load facility 110 is not fully used. In the case where spare power is generated, it may be stored in the energy storage unit 130 will be. However, depending on the power generation and consumption time of the distributed power source 120, or depending on the load condition or characteristics of the power network, or even due to the excessive capacity of the distributed power source facility, There may be a situation where all the power is not consumed in the power supply 100 and surplus power is generated. That is, although the generated power generated by the distributed power source 120 is used in the load facility 110 in the own power network 100 and stored in the own energy storage device 130 with respect to the remaining available power, Surplus power may be generated due to failure to store all the spare power due to the facility capacity of the energy storage device 130 or various other problems. In addition, in the opposite case, the generated power of the distributed power source 120 is far lower than the power consumed by the load facility 110, so that the generated power is not used for energy storage for the energy storage device 130, The power storage for the energy storage device 130 may use only a commercial power source. The present invention provides a method for balancing supply and demand of power facilities through direct transactions between power grids when supply and demand imbalances occur in the storage space of the energy storage device compared to the generated power of distributed power sources in each power network.

Meanwhile, FIG. 2 is a flowchart illustrating a method of determining whether a surplus power grid or a power grid having a storage surplus power according to a method of the present invention, and determining magnitudes (KW and MW) of surplus power and magnitudes (KW and MW) And Fig. Hereinafter, a procedure for calculating the surplus power and the storage margin power in each power grid 100 will be described with reference to FIG. As shown in FIG. 2, the control system 101 of each power grid 100 always determines whether the power grid 100 to which the power grid 100 belongs is a power grid having surplus power or a power grid having storage surplus power, And the remaining spare power is supplied to the other power network generated by the own power network, such that the surplus power is supplied from another power network, (S110 to s191, first and second steps), so that it is possible to always grasp the 'storage free power' that can be stored in the power saving area.

To this end, each of the control systems 101 included in each power grid 100 is configured to generate electric power (KW, MW), which is electric power that can be supplied to the dispersed electric power source 120 included therein, (KW, MW) which is the power consumed in the load facility, the first stored power (KW, MW) which is the power stored in the own energy storage device 130 and the additional storage It is preferable to measure the second stored power (KW, MW) which is the possible power in real time at the present time. If there is power (KW, MW) being supplied to another power network among the generated power KW, MW (KW, MW), it is preferable to calculate it.

In the case of the generated power, after the production power (KW, MW) at present time, which can be generated from each of the distributed power sources 120 in the power network 100 belonging to the power network 100, is measured and collected, It is preferable that the generated power (KW, MW) is used (S110). It is also preferable that the generated power is only for the currently generated power in each of the distributed power sources 120 of itself, but it is also preferable to calculate the sum of the generated power that can not be generated at present but is immediately generated and supplied . In measuring the generated power, the control device included in each of the distributed power sources 120 measures and calculates its generated power (power under power + additional power available) and transmits it to the control system 101 And the control system 101 may calculate only the sum thereof, and the control system 101 may calculate the sum based on various measurement values transmitted from each of the distributed power sources 120.

In the case of the power consumption, each control system 101 remotely measures the average power (KW, MW) consumed at the present time in the load facility 110 of all customers included in the power grid 100 of its own, (S120), it is preferable that the control system 101 collects and calculates data to be measured and transmitted by using a meter capable of remote measurement such as a smart meter installed in each customer. As described above, when the surplus power is supplied from the power grid 100 to the other power grid 100 through the transmission / reception view 200, that is, in the case of the power grid having surplus power, Is also included in the power consumption. The reason why the power consumption includes the surplus power to be supplied to the other power grid 100 is to calculate the surplus power that can be newly supplied to another power grid at the present time. The power consumed in the own power network and the power being supplied to the own energy storage device 130 as well as the power already supplied to the other power network are all net power surplus power.

Each of the control systems 101 preferably grasps the power KW and MW stored in its own energy storage devices 130 in the power network 100 and sets it as the first storage power . The first stored power is the stored power MW, KW of the current energy storage devices currently stored in the power grid. If the energy storage device is a battery, the charging power MW, KW of the PCS And in the case of an air compression energy storage device (CAES), the current operating power (MW, KW) for starting the air compressor will be. The power source for the first stored power may include the generated power generated by the distributed power source of the first power source, the surplus power that is transmitted from another power source, And may be the electric power being charged. The reason for grasping the first stored power, which is the charging power in the present invention, is that the power stored in the respective power networks, that is, the presence or absence of the first stored power, It is possible to grasp whether the power is a power network or not, and the magnitude of the surplus power or the storage power margin varies depending on the magnitude of the first stored power. The present invention proposes a criterion for judging whether the power network having the surplus power or the power network having the reserved power margin is available by using various measurement results including the first stored power, The calculation formula is presented in detail, which will be described later in detail. In the present invention, a part of the first storage power is determined as a storage clearance power. If the first storage power, that is, some or all of the charging power is being charged by the power of the commercial power, And can be stored in a space that can receive and store surplus power. According to the present invention, even if there is the first storage power, which is the charge already being charged in this way, the part being charged by the commercial power source is discriminated to judge it as the reserve spare power and the spare power can be supplied instead of using the commercial power. Method, it is possible to minimize the energy storage used by the commercial power supply and store it using the maximum possible surplus power. Details of this calculation formula will be described later.

Each control system 101 also determines how much power is available to be stored in its own energy storage devices 130 in the power network 100 to which it belongs, (KW, MW), where the second stored power is the sum of the power magnitudes for charging the chargeable energy storage devices in the grid. It will therefore be the sum of the PCS size of the chargeable energy storage devices and should be the first stored power which is already being charged and is waiting to be discharged or being discharged or the current charging power. The second stored power does not mean the total amount of power (KWH, MWH) that can be stored but is the maximum power (KW, MW) that can be recharged at a time. The size (KW, MW) of the second storage power will be the size (KW, MW) of the storage power for the corresponding power network together with the size (KW, MW) of the first storage power. In order to grasp the first storage power and the second storage power, the control system 101 regularly collects charge and discharge information from each of the energy storage devices 130, (KW, MW) and chargeable power (KW, MW) for all of the energy storage devices (130) in the power grid (100) (KW, MW), and the sum of the chargeable powers (KW, MW) is the second stored power (KW, MW). On the other hand, even if there is power corresponding to the first storage power and the second storage power in the energy storage device 130, according to the charge and discharge schedule set by the owner of the energy storage device 130, It may be intentionally excluded due to unnecessary charging through electric power. It is preferable that the first storage power and the second storage power are automatically grasped in view of this case.

After measuring and calculating the generated power, the consumed power, the first stored power, and the second stored power, the control system 101 for each of the power grids uses the measured and calculated values to determine the power grid It is determined whether the power network has the surplus power, the power grid having the reserved spare power, or the power grid having neither the surplus power nor the reserved spare power, and the magnitude of the surplus power and the storage margin power are also calculated . The criterion according to the present invention for judging the power grid having the surplus power and the power grid having the reserved reserve power is shown in FIG. 2 and FIG. Hereinafter, description will be made with reference to FIG. 2 and FIG.

If the generated power at the present time is less than the power consumption in the case of the power network in which the distributed power source 120 is present without the energy storage device 130 in step S150, The generated power is completely consumed by the load equipment in the power network 100 and the insufficient part is not covered by the commercial power supplied through the transmission / Since there is no energy storage device 130, the storage available power also does not exist. Therefore, it is preferable that the state where the generated power is less than or equal to the power consumption in the power network in which the distributed power source 120 is present without the energy storage device 130 is determined as a power network having no surplus power and no saved spare power.

However, if the generated power is larger than the power consumption (s151) in the case of the power network in which the distributed power source 120 is present (s150) without the energy storage device 130, the difference between the generated power and the consumed power (KW, MW) of the surplus power is calculated based on the generated power (KW, MW) and the generated power (KW, MW) It is the difference value (KW, MW) from the power consumption (KW, MW). It is possible to supply power to other power networks as much as the surplus power. In this case, the formula for calculating the surplus power is as follows.

Surplus power = Generation power - Power consumption

Next, a case where both the distributed power source 120 and the energy storage device 130 exist in the power grid 100 can be considered (s160). There may be a state where neither the first storage power nor the second storage power is present in a power network in which both the distributed power source 120 and the energy storage device 130 exist in a state where the generated power is greater than the power consumption (s161). In this case, even if the energy storage device 130 is not fully charged or fully charged, the energy storage device 130 may not be charged at the present time by the management entity of the energy storage device 130 And no energy storage device 130 is being charged. Therefore, in this case, the difference between the generated power and the power consumption becomes the power network s180 having the remaining power without being consumed in the load facility inside the power network, and the magnitude of the surplus power is calculated (s181) As in the above case, we have the following formula.

Surplus power = Generation power - Power consumption

In the meantime, when the generated power is greater than the power consumption and the second storage power is not present and only the first storage power exists, the distributed power source 120 and the energy storage device 130 are both present. In this case, if the difference between the generated power and the consumed power is equal to or less than the first stored power, it means that all the generated power is used for the consumed power and the first stored power, This can not happen. However, if the difference value between the generated power and the consumed power is greater than the charged power, i.e., the first stored power, the surplus power will be larger. That is, it means that the generated power is supplied to the consumed power and used for the first stored power. Therefore, if the generated power is greater than the power consumption and the difference between the generated power and the consumed power is greater than the first stored power (s162), the energy storage device 130 being charged in the power network 100 It is preferable to judge that it exists. The calculation of the magnitude of the surplus power in this case is as follows (s181).

Surplus power = (generated power - consumed power) - first stored power

In this case, both the distributed power source 120 and the energy storage device 130 are present, and when the generated power is greater than the power consumption, the second stored power and the surplus power may exist simultaneously The difference between the generated power and the consumed power is directly related to the difference between the stored power of the second stored power and the stored power of the second stored power, It will begin to be stored, which should appear as an increase in the first storage power. That is, if the second storage power is generated in a state where the generated power is greater than the consumed power, the energy storage device which has generated the second stored power immediately after the power corresponding to the difference between the generated power and the consumed power, Which will be the first stored power. If all of the energy storage devices generating the second stored power with the power corresponding to the difference between the generated power and the consumed power can not be charged, the remainder will exist as the second stored power. In this case, All of the differences in power consumption are used for charging the energy storage device, so that the generated power deviates from the state of being larger than the power consumption, and the state of no surplus power is obtained. Therefore, in the determination and calculation of the surplus power and the storage spare power according to the present invention, it is determined that the surplus power can not exist if the generated power is greater than the power consumption and the second storage power exists.

In the present invention, the conditions of the power grid for generating surplus power are as follows. (1) The distributed power source is required. (2) The generated power is greater than the power consumption. (4) When there is a first storage power, the size of the first storage power should be smaller than the difference between the generated power and the power consumption. When these conditions are satisfied,

- if there is no energy storage device and there is a distributed power supply and the generated power is greater than the power consumption,

- a power grid having a distributed power source and an energy storage device, wherein said first stored power and said second stored power are absent and said generated power is greater than said consumed power,

- a power grid having a distributed power source and an energy storage device, the second storage power being absent, the generated power being greater than the power consumption, and the first stored power being smaller than the difference between the generated power and the consumed power,

It is preferable to determine the power network having the surplus power only in these three cases, and in other cases, surplus power can not be generated. In addition, it is desirable to calculate the magnitude of the surplus power that can be commonly applied in the above three cases as follows. In the following equation, the first storage power may be applied only in the third case, and in the remaining cases, 0 may be substituted.

Surplus power = (generated power - consumed power) - first stored power

Next, we examine the power grid with storage power reserve. The most representative case of having a reserve free power is the case of having the energy storage device 130 in the power network without the distributed power supply 120 (s170). In this case, since there is no distributed power source 120, the surplus power does not occur naturally and exists only in the case of having the stored spare power. However, even if the energy storage device 130 is provided without the distributed power supply 120, it may be determined that the storage power supply 120 does not have the storage power. In either case, the first storage power and the second storage power are both not measured. The absence of the first storage power means that there is no energy storage device being charged and that the second storage power is not measured means that the energy storage device 130 is not fully charged or is not chargeable, In this case, it should be judged that there is no storage power reserve. In the other case, there is the first storage power but the second storage power is not available. In the case where the surplus power is supplied from another power network, the power received is equal to or larger than the first storage power . In the present invention, the storage clearance power is the size of a space to receive and store surplus power from another power grid. In this case, there is no empty space (second storage power) to store while charging the energy storage device 130, It is preferable that the power is already being charged by receiving surplus power from another power network and therefore it is desirable that the surplus power to be supplied is not present.

However, in the case where only the first storage power exists in the power network having the energy storage device 130 without the distributed power source 120 (s171), surplus power is not supplied from another power network, or surplus power It is preferable to determine that the power is the power grid having the stored reserve power when the size of the supplied power is smaller than the first storage power (s190). The first storage power exists only in the power network having the energy storage device 130 without the distributed power source 120. The fact that the surplus power is not supplied in the other power network means that the entire first storage power is consumed by using the commercial power It means that the energy storage device is being charged, and this part needs to be replaced with the surplus power instead of the commercial power. Therefore, when the surplus power is not supplied from another power network, it is preferable to calculate the size corresponding to the entire first storage power as the storage spare power. In addition, even when the surplus power is being supplied from another power network, when the size of the supplied power is smaller than the first storage power, some of the first storage power is being supplied with surplus power, It is preferable that the portion is stored as the storage allowance so as to be replaced with the surplus power even for a portion stored as commercial power. That is, it is preferable that the portion corresponding to the portion being charged using the commercial power among the first storage power is calculated as the storage standby power in order to replace the remaining portion with the surplus power. Therefore, in the power network having only the distributed power source, it is preferable that the storage power margin calculation formula for the case where only the first stored power exists is as follows.

Storage reserve power = First storage power - Surplus power being supplied by another power network

On the other hand, in the case of the power network having only the second storage power in the power network having the energy storage device 130 without the distributed power source 120, there is no particular factor to be considered in step s171, It is preferable to judge that there is a storage margin power of In the case where the first storage power and the second storage power exist simultaneously in the power network having the energy storage device 130 without the distributed power source 120, Is combined with " the case of only the first storage power " and " the case of only the second storage power in the power network having the energy storage device without the distributed power source ', the storage power margin calculation formula in this case is preferably as follows .

Storage power reserve = first storage power + second storage power - surplus power being supplied from another power network

Next, a case will be described in which, in the power network in which both the distributed power source 120 and the energy storage device 130 are present (s160), the stored standby power is generated even when the generated power is greater than the power consumption see. In a power network in which both the distributed power source 120 and the energy storage device 130 are present, when the generated power is greater than the power consumption, only when the first stored power is measured, . This is because the difference value between the generated power and the consumed power does not go out of the power grid unless there is surplus power in a state where power remaining by the difference between the generated power and the consumed power is generated, And must be used for charging the storage device 130. However, when the generated power is larger than the power consumption and the first stored power exists, the storage power is not always the same. In the above case, Is generated, that is, "a power grid whose first storage power is smaller than the difference between the generated power and the consumed power" should be excluded. Therefore, when the generated reserve power is generated in a state where the generated power is greater than the consumed power, the difference between the generated power and the consumed power is equal to or less than the first stored power.

In this case, the power corresponding to the difference between the generated power and the consumed power is not sufficient for the charging power for the energy storage device 130. As a result, The portion exceeding the power corresponding to the difference between the power and the power consumption is that the commercial power or the surplus power is supplied from another power network and is being charged. It is not necessary to consider it because it is filled, but for the part supplied by the commercial power, it should be calculated as the reserve power to be filled with the surplus power of the other power network. Therefore, if only the first storage power exists and the first stored power is greater than the difference between the generated power and the consumed power, the remaining portion is filled with the surplus power supplied from the power network different from the commercial power. It is necessary to calculate only the storage margin power. Therefore, in this case, the storage allowance power is not the stored spare power because the difference between the generated power and the consumed power of the first stored power is a portion supplied from the distributed power supply 120. Also, Since it is supplied with surplus power, it should be excluded from the above storage power reserve. Therefore, in this case, there is only a first storage power of the " power grid in which the generated power is larger than the consumed power and the first stored power is smaller than the difference between the generated power and the consumed power in the power grid in which both the distributed power source and the energy storage device are present & It is preferable that the storage power margin in the power grid is calculated by the following equation.

Storage power reserve = First storage power - (Generated power - Power consumption) - Surplus power supplied from other power grid

If the second storage power is present at the same time in the above case, that is, " in a power network in which both the distributed power source and the energy storage device exist, the generated power is larger than the consumed power, For the power network in which the first storage power and the second storage power are simultaneously present among the 'small power grid', it is necessary to calculate the storage free power including the space not currently being charged, that is, the portion corresponding to the second storage power , The calculation formula is preferably as follows.

Storage power reserve = First storage power + Second storage power (Generated power - Power consumption) - Surplus power supplied from other power grid

On the other hand, in a power network in which both the distributed power source 120 and the energy storage device 130 exist, the generated power is greater than the power consumption, and the first stored power and the second stored power exist simultaneously, If the stored power is equal to the difference between the generated power and the consumed power, the first stored power is entirely covered by the difference between the generated power and the consumed power, It is preferable to make only the part of the storage power reserve.

As another example, it can be considered that there exist both the distributed power source 120 and the energy storage device 130, and the generated power is equal to or lower than the power consumption. In such a case, The surplus power will not be generated because it is consumed in the load facility 110 in the portable terminal 100. In this state, if there is no first storage power but only the second storage power, the storage spare power will be the same as the second storage power. If there is no second storage power and there is only the first storage power, the first storage power is being charged with a commercial power or a power supplied from another power network because the generation power of the distributed power in the power grid does not remain. It is desirable to calculate only the portion that is being charged with the commercial power supply as the storage power margin. Therefore, in this case, it is preferable that the storage allowable power is given by the following formula.

Storage power reserve = 1st storage power - Surplus power supplied from other power grid

However, when the first storage power and the second storage power are measured in the same manner, it is preferable to add the second storage power to the storage power margin calculated as shown in the above equation.

Storage power reserve = First storage power + Second storage power - Surplus power supplied from other power grid

According to the present invention, the conditions of the power grid for generating the storage allowable power include (1) an energy storage device, (2) at least one of the first storage power and the second storage power is present If the generated power is less than the power consumption or the generated power is larger than the consumed power, the first stored power and the size of the first stored power must be larger than the difference between the generated power and the consumed power. When these conditions are satisfied,

- there is no distributed power source and there is an energy storage device, the power grid with the first stored power and / or the second stored power,

- a power grid having a distributed power source and an energy storage device, said first stored power and / or said second stored power, said generated power not exceeding said power consumption,

A power grid having a distributed power source and an energy storage device and having the first stored power, the generated power being greater than the power consumption, and the difference between the generated power and the consumed power being equal to or less than the first stored power,

It is preferable to determine that the power grid has a storage margin power only in these three cases. In other cases, the storage margin power can not be generated. In addition, it is desirable to calculate the magnitude of the stored free power that can be commonly applied in the above three cases as follows. In the following equation, the first storage power, the second storage power, and the surplus power to be supplied from the other power network can be applied only if they exist, and if they do not exist, 0 can be calculated.

* Storage power reserve = First storage power + Second storage power - (Generated power - Power consumption) - Surplus power supplied from other power grid

It is preferable that the remaining power grids other than the three types of power grids having the above-mentioned six types of power grids having surplus power and three types of power grids having the surplus power are determined to be the power grids without the surplus power and the storage spare power . For example, when the generated power is not more than the power consumption in the power network without the energy storage device 130 and the distributed power source 120, or when the distributed power source 120 and the energy storage device 130 are provided, 1 storage power and the second storage power, and the generated power is equal to or lower than the power consumption.

As described above, the present invention proposes a determination and calculation algorithm capable of accurately determining the power network having the surplus power and the power network having the storage power in real time and calculating the size accurately, And the energy storage device 130. It is also possible to perform a distributed power trading between the power networks through the control of the energy storage device 130. The power storage device 130 also detects a portion of the power stored in the energy storage device 130 that is being stored as a commercial power source, To save and store the free space and surplus power within the transmission plan view as much as possible.

On the other hand, FIG. 4 is a flowchart illustrating a method for controlling a distributed power trading according to the present invention, wherein a first power grid, which is a power grid having surplus power, And selecting a second power network to supply surplus power. That is, the procedure described after referring to FIG. 2 and after "determining whether there is surplus power / storage margin power at present time and a size measurement and calculation process for the power network" (see connection point A).

The present invention relates to a method for controlling distributed power trading centered on a power grid having surplus power as described above. Therefore, the first power grid, which is the power grid having the surplus power, selects the second power grid, which is the power grid having the storage margin power, to supply the surplus power. This method is advantageous when the sum of the surplus power for the power networks connected to the entire transmission view is larger than the sum of the storage free space, that is, the storage space is larger than the remaining power of generated power. Since there is a lot of free space in the storage device compared to the surplus power, it is necessary to be able to select the storage device having the best condition (for example, the storage cost is low) Because space is enough to store all surplus power, it is economically advantageous to extract all surplus power as much as possible and to store it without leaving out. Accordingly, the first power grid, which is the power grid having the surplus power, selects the second grid, which is the power grid having the storage margin power, but has a sufficient free space to supply surplus power. In other words, when the power network with surplus power has a storage capacity larger than the surplus power when considering the entire power networks connected to the transmission / transmission view, when the power network having the surplus power is selected, In this case, it is possible to store all the surplus power generated through the real-time fluctuation information in the third power network, and to store the surplus power in all the remaining power without leaving the surplus power. It is possible.

As described above, the control system 101 of each power network 100 in the first step (S110 to S140) and the second step (S150 to S191) determines that the power network 100 to which the power network 100 belongs is measured If there is the surplus power (s180), the storage slack power (s190), or nothing, or whether there is the surplus power or the storage slack power by using various data such as power consumption, (S181 and S191). Then, the first power network 100a, which is one of the power networks that determine that the power network has surplus power, calculates a first time in consideration of the situation and power consumption of the distributed power source 120 included in the power network of the first power network 100a (S210), where the first time refers to a time at which the first power grid 100a will continue to supply the surplus power to the other power grid 100. Accordingly, when the first time is determined and the supply of the first power is started, the first power supply 100a may supply the first power to the first power network 100a without changing the magnitude of the surplus power during the first time. Therefore, it is preferable that the first time is set in consideration of the fluctuation of power generation and power consumption of the distributed power supply 120 included in the first power network. More preferably, the power consumption and the predicted change trend of the load facility 110 for the load facility 110 with the power generation schedule of the distributed power source 120 in the first power grid 100a, It is preferable that the first time is elastically applied in an appropriate time period according to the time period. In order to do this, the control system 101 of each power network preferably has data on its own power network as a judgment data capable of properly setting the first time. Therefore, the first time may vary depending on the first power grid 100a, the time zone, the power generation conditions, etc., and may be a time when the load fluctuates severely or a change in generated power of the distributed power source 120 is severe or severe In the case of the expected time zone or the like, it is preferable to divide the time into the minimum time that the current state can be maintained, and it is also possible to set the first time to a sufficient time during the time when the generated power is stable and the load variation is not severe. According to the present invention, by supplying the surplus power by setting the first time within the range with no or small fluctuation of the surplus power, it is possible to supply and store stable surplus power at least during the first time period .

However, as described above, it is also preferable to resiliently set the first time in consideration of the fluctuation of the surplus power, but it is also preferable that the first time is fixed to a minimum short time. Since the variation width of the surplus electric power is smaller as the first time is shorter, the electric power having a small fluctuation width during the first time period can be stably stored in the supplied electric power network. On the other hand, if the first time is short, the relationship between the supplied power grid and the supplied power grid is likely to change at a rapid cycle, thereby making the supply and demand relationship of surplus power unstable. However, according to the present invention, the power network to be supplied with the surplus power is selected again before the first time is over, and since the previously selected power network is selected to be preferentially selected, the first time is ended and the new first time is started The surplus power can be continuously supplied to the power supply network immediately before the supply of the surplus power, so that it is possible to maintain a stable supply-demand relationship even if the first time is set short. Accordingly, even if the first time is fixed and operated for a minimum time, the power network power transaction can be stably operated.

After setting the first time, the first power grid 100a transmits a proposal request signal to the power grid 100b, 100c, 100c connected to the transmission / (S210 to s220) in order to perform the third step. However, there may be a plurality of power networks having surplus power within the transmission / transmission schedule. In this case, the magnitude information of the surplus power is transmitted between the power grids to share with each other, and the proposal request signal is first transmitted to the first power grid of the power grid having the largest surplus power at the present time, It is more preferable that the next power grid send the proposal request signal sequentially.

Preferably, the proposal request signal includes the identification code of the first power network 100a itself and the first time. Herein, the identification code of the first power network 100a is transmitted to each power network 100 The identification code is preferably a unique code that allows each power network 100 to identify each other. It is preferable that the control system 101 of each power network 100 includes information data (not shown) for the identification codes of each power network so that different power networks can be identified and identified by the identification codes. In the present invention, the magnitude of the surplus power is not required in the proposal request and proposal process, and in the case of the supply condition, It can be omitted because each control system 101 needs to have it. Accordingly, the amount of data exchanged between the control systems 101 of the power network 100 can be minimized, thereby reducing data traffic and speeding up processing and response. In addition, the proposal request signal includes a signal indicating whether the proposal request signal received by the power grids 100b, 100c, 100d, ... receiving the proposal request signal is a signal transmitted from the first power grids 100a It is preferable to further include an authentication code that can be verified. Details of the verification of the proposal request signal and the authentication code will be described later with reference to FIG.

On the other hand, among the power networks 100b, 100c, 100d, ... receiving the proposal request signal, the power grids 100b, 100c, and 100d having the reserved reserve power transmit the proposal request signals transmitted by the first power network 100a (S221), calculates the power that can be continuously stored for the first time in the energy storage device 130 in its own power network, and stores it s230), and transmits the stored proposal containing its own identification code and the storage limit to the first power network 100a in the storage proposal signal (s240). Here, the storage limit refers to a power (KW) capable of continuously supplying power for the first time considering the storage capacity (KWh) remaining in each of the energy storage devices in its own power network. For example, The maximum storage capacity (KW), that is, the size of the PCS, is 400 KW. If the first time is 3 hours, the storage limit should be 200 KW. It will be possible to continue storing for a period of time. However, if the storage capacity remaining in the energy storage device is 2MWh, the storage limit will be 400KW which is equal to the maximum charge capacity (KW).

The first power network 100a receiving the proposal request signals transmitted from the power networks 100b, 100c and 100d having received the proposal request signal in the fourth step transmits the proposal request signals to the power networks 100b, 100b, and 100d of the second power network 100b, 100d, the selected second power network 100b, 100d is selected as a second power network for supplying the surplus power to the second power network 100b, 100d, A fifth acceptance request including a first time and a start time of the first time, which is a scheduled time for starting supply of the surplus power, to the second power network 100b or 100d in a proposed acceptance signal . That is, when the power networks 100b, 100c, and 100d transmit the stored proposal signal in step S240, the first power network 100a transmits at least one of the power networks 100b, 100c, and 100d that transmitted the stored proposal signal (S250), determines the supply limit for each of the second power grids 100b and 100d (s260), and then transmits the proposed consent signal to the second power grids 100b and 100d , And 100d (s270). The reason for sending the start time of the first time is that when the first power grid 100a supplies surplus power to the transmission / reception view 200, at the same time, the second power grid 100b, The first power network 100a and the second power networks 100b and 100d are connected to the first power network 100b and the second power networks 100b and 100d through the transmission / And receives the supply. The details of how the first power network 100a selects the second power networks 100b and 100d and how to set the supply limits for the second power networks 100b and 100d will be described with reference to FIG. Will be described later.

If the second power grids 100b and 100d receive the proposed acceptance signal, the second power grids 100b and 100d receive the proposal acceptance signal including the first supply time limit, the first time, and the start time, It is preferable to carry out the sixth step of transmitting the acknowledgment in the acknowledgment signal to the first power network 100a (s280). The inclusion of the supply approval limit, the first supply time limit, and the start time limit of the proposed consent order in the acknowledgment form is equivalent to that of the first power supply network 100a and the second power supply networks 100b and 100d As a confirmation letter to send and receive a kind of electronic contract. Therefore, it is preferable that the reception confirmation sent from the second power grids 100b and 100d further includes an authentication code such as the proposal request sent from the first power network 100a, Details of verification of the authentication code and the verification of the first power network 100a with respect to the contents transmitted by the two power grids 100b and 100d will be described later with reference to FIG.

When the first power network 100a receives the acknowledgment signal, it verifies the acknowledgment signal (s281) and supplies the surplus power to the transmission / reception view 200 during the first time (s290 And at the same time, generates the real-time variation information of the supply limit according to the variation of the surplus power, and transmits the generated information to the second power grids 100b and 100d (s300). The second power grids 100b and 100d receive the power from the transmission / reception view 200 for the first time and store the received power in the energy storage device 130 of the second power network 100b according to the real-time fluctuation information ) It is preferable to perform the eighth step.

Meanwhile, if the first power network 100a and the second power networks 100b and 100d are performing the seventh and eighth steps at a predetermined time before the end of the first time (s320) (S340, s322) until the first time ends (s350) from the predetermined time (s350), and when the first time ends (s350), the seventh step The ninth step may be repeated as long as the first power grid is able to supply the surplus power, in the ninth step of performing the eighth step again (s351, s352). Here, the predetermined time may be within a few seconds (sec) since the predetermined time may be just before the first time ends and the first to eighth steps may be performed, and the processing speed or data If the transmission speed of the transmission network is fast, it may be several hundred to several tens of milliseconds (ms) or even several milliseconds. In this process, if the first power grid 100a can still supply surplus power immediately before the end of the first time, the second power grid to supply the surplus power is selected and waited in advance, and the first time The second power grid to be supplied with surplus power is already determined and waiting for the first power grid 100a, so that even if the first power grid 100a ends, There is no need to resume supply and resume. Therefore, there is an effect that the surplus power can be supplied stably and constantly. In addition, since the second power network to be newly selected just before the end of the first time period can be assigned to the second power grids 100b and 100d selected immediately before, the large power fluctuation The second power grids selected at this time will be the same power grids as the second selected power grids 100b and 100d. Therefore, the connection relationship between the first power network 100a and the second power networks 100b and 100d can be continuously maintained. According to the present invention, all of the surplus power can be seamlessly traded and stored by controlling the distributed power source and the energy storage device based on the real time measurement value. If the fluctuation of the surplus power is severe due to the fluctuation of the generated power or the consumed power, the first time can be shortened and the transaction can be performed. On the other hand, even if the first time is short, The redundant power supply / demand relationship between the first power network 100a and the second power networks 100b and 100d can be continuously and stably maintained. Therefore, the first time may be longer than the time that the ninth step can be repeated once. If the length is set to be longer than the time that the ninth step can be repeated once, the application may be possible even if the state of the power network is very changed. Therefore, it is possible to operate the system without setting the length of the first time to be changed according to the situation of the power network, but by setting the time to be longer than the time that the ninth step can be repeated once.

In order to maintain the connection relation between the first power network 100a and the second power networks 100b and 100d continuously and stably, the ninth step of the present invention is performed by repeating the ninth step The start time "in the fifth step to be performed is preferably equal to the" end time of the first time set in the third step repeatedly performed immediately before ". That is, at the end of the first time, a new first time that is repeated by the ninth step is immediately started. In the second step, which is performed by repeating the ninth step, the surplus power of the first power grid 100a is calculated by multiplying the surplus power supplied during the seventh step, It is preferable that the value is calculated after excluding it. This is because the surplus power remaining in the first power network 100a during the first time period is a value excluding the surplus power supplied to the second power networks 100b and 100d at the original surplus power And if there is no fluctuation in the surplus power in the state where the predetermined time has elapsed from the start time of the first time, the surplus power at the present time after the predetermined time will be calculated as zero. However, since the surplus power that was supplied to the second power grids 100b and 100d can be supplied again at the time point when the first time that is repeated by the ninth step is restarted, The sum of the surplus powers presently being supplied is used as the surplus power at the next repetitive first time.

Similarly, in the second step performed by repeating the ninth step, the storage allowance power of the second power network is calculated by adding the power that is being supplied by the immediately preceding repeatedly performed eighth step to the storage allowance power Value. This is because the remaining storage power remaining in the second power grid 100b or 100d during the first time period will be calculated as a value excluding the surplus power supplied from the first power grid 100a at the original storage power margin , If there is no change in the supply power in a state where the predetermined time has elapsed from the start time of the first time, the storage allowance power at the present time after the predetermined time is calculated as zero, or the supply limit is calculated as zero It is calculated as a value equal to the storage margin power remaining at the start time of the first time. However, at the time when the first time that is repeated by the ninth step is restarted, since the remaining storage power equivalent to the surplus power supplied from the first power grid 100a is generated again, The value obtained by adding the surplus power currently being supplied is set to the storage allowable power at the next repeated time.

Meanwhile, FIG. 5 illustrates a procedure for controlling distributed power trading at a transmission power forecast centered on a power grid having surplus power according to the present invention, in which the first power grid selects the second power grid according to a priority order FIG. Hereinafter, a method of selecting the second power network by the first power network will be described in detail with reference to FIG. The priority order for the first power network 100a to select the second power network may be selected sequentially from the power network having the lowest storage cost in the position of each of the first power networks, It is also possible to select them in order. However, it is also possible to preferentially select mutually by strategic alliances among power networks even if they are not distance or cost. Therefore, it is preferable that each control system 101 includes respective priority information for selecting the second power network when the power network 100 to which the power network 100 belongs belongs becomes the first power network 100a, The priority information may be selected among the various methods described above. When the first power network 100a selects the second power network 100b 100d in the fifth step, which is repeated in the ninth step, in spite of the priority information, It is preferable to select the second power network 100b 100d as a priority. In addition, it is necessary to reduce the electric power supplied from the country or the whole viewpoint, so that it is necessary to reduce the electric power supplied through the transmission / transmission forecast. Therefore, if the electric power network is charging the energy storage device with the commercial power among the power networks having the first storage power, It is also preferable to select the stored power with priority given to the power network having a large commercial power. For this purpose, it is preferable to calculate the commercial charging power for the second power grid having the first storage power of the second power grid as follows, and preferentially select the second power grid in order of decreasing calculated values.

Commercial Charging Power = First Storage Power - (Generation Power - Power Consumption) - Surplus power supplied from other power networks

As shown in FIG. 5, when the first power network 100a receives the storage proposal signal from the second power networks (s241), the second power networks are selected according to the priority order (see a red dotted rectangle) . That is, in the fifth step, when the first power network 100a selects the second power network, a total of n (n is an integer equal to or greater than 1) (S251). Each time a second power network is added one by one, a total storage amount is added to calculate a sum (s252), and a sum of the respective storage limits is added to the surplus power It is preferable to repeat the selected and stored sums until it becomes larger (s253). (100h), 400KW (100h), 400KW (100h), and 200KW (100i), respectively, when the storage capacities of the four power grids are in the order of 900KW, The total of the storage limits becomes 1,100 KW and surpasses the surplus power (900 KW), so that the three power grids 100 f, 100 g and 100 h are the second power grids and the fourth power grid 100 i 2 power grid. However, if the sum of the respective storage limits is equal to or slightly larger than the surplus power, it is also possible to use the second power network to prepare for the change (increase) of the surplus power.

The first power grid 100a selects the second power grids in the fifth step and then determines a supply limit of the surplus power for each of the selected second power grids in step S260, The supply limit for each of the second power networks is preferably determined as follows.

- the (n-1) th second power grid supply limit = the respective storage limit

- nth second power grid supply limit = surplus power - (sum of n-1th supply limits)

Therefore, in the above case where three power grids are selected as the second power grids, the supply limits of the first and second power grids are 300 KW (100 f) and 400 KW (100 g), respectively, (300KW + 400KW) = 200KW in the case of the first and second power grids 100h, 200KW is preferable.

Meanwhile, in the seventh step (s300), the real-time variation information generated by the first power grid 100a is a real-time variation value of the supply limit for each of the second power grids, When the surplus power decreases, it is preferable to decrease the power in the descending order from the supply limit of the n-th second power network, and increase the surplus power in the ascending order if the surplus power increases. That is, as shown in the example of the table below, when the surplus power gradually decreases, the power supplied to the third second power grid 100h gradually decreases. After the third power grid 100h becomes 0, The supply power to the power grid 100g is decreased, and when the surplus power is increased, the increase is made in the reverse order.

Surplus power
(KW) Supply Limit (KW) first
The second power grid 100f, second
The second power grid 100g, third
The second power network 100h, 900 300 400 200 880 300 400 180 800 300 400 100 690 300 390 0 670 300 370 0 690 300 390 0 750 300 400 50 850 300 400 150 900 300 400 200

Meanwhile, in the present invention, in the second power network receiving the surplus power from the first power network during the first time and storing power in the energy storage device, the storage limit may be smaller than the supply limit of the power supplied from the first power network If it is large, it is also desirable to propose storage so that additional power can be supplied to the new first power network. This is a storage proposal for receiving additional power when the surplus power is received from the first power network and the power is being stored in the energy storage device but the size that can be stored in the own energy storage device still remains. In this regard, FIG. 6 shows a procedure flow in which the second power network 100h having a storage limit larger than the supply limit proposes to store the new first power network 100a '(after the connection point E in FIG. 4). As shown in FIG. 6, the second power network 100h receives power from the transmission / transmission scheme according to the real-time fluctuation information according to the supply limit, which is transmitted from the first power network 100a, (S310). If the supply limit is smaller than the storage limit (s311), the remaining storage space is not utilized. Therefore, Since the storage limit is 400 KW but the supply limit from the first power grid 100a is 200 KW, 200 KW of the stored grid is not utilized. In this state, the new first power grid 100a ' (S312), the fourth step, the sixth step, and the eighth step are performed by newly storing the value (200 KW in the above example) excluding the supply limit in the storage limit In the second power network 100h in which the supply limit of the second power network is smaller than the storage limit, before the first time elapses, the new power network 100a ' When receiving the request signal (s312), the second power network 100h sends a storage proposal signal to the new first power network 100a 'with a new value (200KW in the above example) excluding the supply limit (s313). When a new proposal acknowledgment signal is received from the new first power network 100a 'for the new stored proposal signal (s314), the new first power network 100a' (S315), and receives electric power from the transmission / reception view (200) for a new first time determined by the new first power network according to the real-time variation information sent from the new first power network (100a ' (Step S317).

The present invention also reduces the supply power to the second power grid in a state where the first power grid is short of the surplus power due to a change in the environment in the first power grid, When the storage is no longer performed, the second power network sends a cancellation signal to the first power grid to stop the second power grid, thereby allowing the second power grid to store power in the energy storage device. FIG. 7 is a flowchart illustrating a procedure for transmitting a cancellation signal to the first power grid 100a in the second power grid 100h with reduced power supply according to the present invention. As shown in FIG. 7, in the second power network 100h, before the first time elapses (s370), the state where the supply limit by the real time variation information is reduced to a predetermined size or less is s321, (S322), a cancellation signal is transmitted to the first power network 100a (s323), and the power storage from the transmission / distribution view 200 is stopped for the energy storage device of its own (s324) . Here, it is preferable that the second time is determined in consideration of a decrease trend after the surplus power is generated in the first power network, a remaining time during the first time, and the like, but is shorter than the first time.

Further, in the present invention, when the first power grid 100a further generates surplus power while supplying surplus power to the second power grids 100b and 100d, a new It is possible to find and store the empty space of the energy storage devices in the plurality of power supply networks 100 even if surplus power generated due to the change of the environment is generated. That is, even if the surplus power fluctuates, there is an advantage that the variation can be immediately stored in the energy storage device in quick response. For this, during the supply of surplus power to the second power network 100b, 100d in the first power network 100a, the surplus power may be applied to all of the second power networks 100b, If the state in which the state is greater than the sum of the supply limits by at least a predetermined amount is continued for a predetermined time or more, the third step, the fifth step, and the seventh step are performed with power exceeding the sum of the supply limits as new surplus power .

In the present invention, for the purpose of preventing the forgery and falsification of transaction contents exchanged between the first power network 100a and the second power networks 100b and 100d, and preventing non-repudiation of transactions between transaction parties, Algorithm. To this end, a series of signals exchanged between the first power network 100a and the second power networks 100b and 100d, that is, from a proposal request signal transmitted by the first power network to a reception confirmation signal transmitted by the second power networks, A plurality of transactions (proposal request, proposal, acceptance, etc., steps 3 to 6) for establishing one unit transaction (surplus power supply-storage, seventh step and eighth step) And each unit transaction is also connected to each other through the hash value of the unit transaction before and after. In addition to including the hash value hashing the contents of each signal, the hash value includes the previous hash value, , The signals to be transmitted and received are connected to each other through the hash value, and the structure is not changeable. In other words, to forge a signal value, all signals exchanged between the first power network 100a and the second power networks 100b and 100d must be corrected. All transactions are connected to the previous transaction received, Since the records are distributed and stored in the respective power grids, the forgery and falsification is intrinsically blocked, and therefore, the security is excellent. Therefore, even if the power manganese direct transaction is carried out without a separate intermediary system for surplus power, There is an effect.

In addition, the proposal request signal corresponding to the first signal in one unit transaction among the signals connected to each other by the hash value includes a first authentication (first authentication) in which the hash value is encrypted by the private key (PKI based private key) of the first power network 100a Code, the first authentication code is decrypted by the public key (PKI-based public key) of the first power network 100a when it is confirmed by the second power network 100b or 100d, The reception confirmation signal corresponding to the final signal in one unit transaction includes a second authentication code obtained by encrypting the hash value with the private key of the second power network 100b or 100d, , The second authentication code is decrypted with the public key of the second power network (100b, 100d) and verified, thereby providing a means for verification and non-repudiation of the amount of power to be exchanged, Inner It is possible to reduce the screen. To this end, each of the control systems 101 preferably includes its own private key and a public key for each of the other power network 100 control systems 101. FIG. 8 illustrates a procedure flow including a structure for a signal transmitted / received between a first power network and a second power network in the present invention. As shown in FIG. 8, the first power network 100a transmits the proposal request signal (S219), a first hash value obtained by hashing the proposal request including its identification code, the magnitude of the surplus power and the first time with a one-way hashing function is generated, and then the first hash value is added to the proposal request, Value to generate a second hash value hashed with the same hashing function. And generate the first authentication code in which the second hash value is encrypted with the private key of the first power network. The proposal request signal transmitted from the first power network 100a to the second power network 100b or 100d includes the proposal request, the first hash value, the second hash value, and the first authentication code (S220).

The second power network 100b or 100d having received the proposal request signal from the first power network 100a may use a hash function identical to the hash function used by the first power network 100a, The hash value including the first hash value is included in the proposal request, and the hash value is compared with a result obtained by decoding the first authentication code with the public key of the first power network 100a, It can be confirmed that the signal is from the first power grid 100a (s221). The storage proposal signal sent from the second power network 100b or 100d to the first power network 100a includes hashing the storage proposal and the second hash value together with the second hash value, It is preferable to further include a third hash value (s239, s240).

The proposed acceptance signal sent from the first power network 100a to the second power network 100b or 100d includes a fourth hash value obtained by hashing the proposed consent and the third hash value together with the third hash value, Value (s269, s270). Here, when generating the fourth hash value, the hash value including all the third hash values sent from all the power grids selected as the second power grids 100b and 100d together with the proposed acceptance is used as the fourth hash value It is more desirable to do this, which will further reduce the possibility of forgery and enhance security. A fifth hash value obtained by hashing the proposed consent and the fourth hash value together with the fourth hash value is transmitted to the acknowledgment signal sent from the second power network 100b to the first power network 100a , And further includes a second authentication code in which the fifth hash value is encrypted with the private key of the second power network (100b, 100d) (s279, s280).

The first power network 100a having received the acknowledgment signal decrypts the second authentication code with the public key of the second power network 100b or 100d by using a value obtained by 'hashing the reception acknowledgment and the fourth hash value' And confirms the acknowledgment signal (s281). Since a series of signals are linked to each other through a hash value, if one of the series of signals is falsified or modulated, the connected hash values do not coincide with each other, so that forgery or alteration is difficult, (First power network → second power network) and the final signal (second power network → first power network) contain an authentication code encrypted with their own private key, so that not only is there a non-repudiation effect on transaction contents, Since signals exchanged in the middle, not the final, are connected to each other by a hash value to prevent forgery and falsification, the burden of computing resources due to encryption and decryption can be relieved and the processing speed can be increased .

In addition, in the third step performed by repeating the ninth step, the first hash value included in the proposal request signal may be the fifth hash value, The transactions being performed are continuously linked by the hash value of the previous transaction. That is, since each unit transaction performed during the first time period is connected to each other through the hash value with the unit transactions before and after, the security can be further strengthened.

Although the present invention has been described with reference to the above examples, the present invention is not necessarily limited to these examples, and various modifications may be made without departing from the scope of the present invention. Therefore, the examples disclosed in the present invention are not intended to limit the scope of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100 power grid
101 control system
110 Load Equipment
120 Distributed power supply
130 Energy storage device
200 Broadcasting Outlook

Claims (4)

In a Smart Grid transmission view that includes two or more divided power grids that include one or more distributed power sources and / or one or more energy storage devices, if the storable power is greater than the available power when viewing the entire transmission perspective, Each of the control systems included in the control system controls a distributed power supply and an energy storage device for trading power based on a real time measurement value measured at a current point of time,
In each of the power networks, power generation power, which is power that can be supplied to its own distributed power supply, power consumption, which is power consumed in its own load facility, first storage power, which is power stored in its own energy storage device, A second step of measuring a second stored power, which is a power capable of being additionally stored, in real time at a current point of time and including power to be supplied to another power network among the generated power in the power consumption;
Wherein each of the power grids calculates surplus power that can be supplied to another power grid among the generated power or storage surplus power that can be stored in its own energy storage device by receiving the surplus power from another power grid,
- the magnitude of the surplus power is calculated according to the magnitude of the generated power, the power consumption and the first stored power,
The size of the storage allowance power is calculated according to the generated power, the power consumption, the first storage power, the second storage power, and the magnitude of the surplus power supplied from another power network,
A second step of transmitting the magnitude of the surplus power to each of the other power grids when the surplus power exists;
Determining a repetition time for repeatedly supplying the surplus power to the other power network in the first power network, which is the power network having the largest surplus power among the power network having the surplus power, And a third step of transmitting a proposal request including the first time in a proposal request signal to each of the power grids;
And a control unit that verifies the proposal request signal in the power network having the storage margin power among the power networks having received the proposal request signal, calculates a power that can be continuously stored in the energy storage apparatus for the first time, A fourth step of storing the storage proposal including the own identification code and the storage limit in a storage suggestion signal and transmitting the stored proposal to the first power network;
Selecting one of the first and second power grids as a second power grid to supply the surplus power to at least one of the power grids transmitting the stored proposal signal in the first power grid, A fifth acceptance request including a limit, a first time, and a start time of the first time in a proposed acceptance signal and transmitting the acceptance consent to each of the second power grids;
A sixth step of receiving, in the second power network, an acknowledgment including an own supply limit by the proposed consent order, the first time and the start time, in an acknowledgment signal, and transmitting the reception acknowledgment to the first power network;
Wherein the first power network verifies the receipt acknowledgment signal and then supplies the surplus power to the transmission / reception outlook during the first time from the start time to obtain real-time fluctuation information of the supply limit according to the fluctuation of the surplus power And generating and transmitting the generated power to the second power network;
An eighth step of receiving power from the transmission / reception outlook for the first time from the start time in the second power network and storing the power in its own energy storage device according to the real time fluctuation information; And
Performing the first to sixth steps again from a predetermined time before the first time period ends until the first time period ends in the first power network and the second power network, A ninth step of performing the seventh step and the eighth step again; , ≪ / RTI &
The ninth step is continuously repeated as long as the first power grid can supply the surplus power,
In the fifth step, which is repeated by the ninth step, the start time is the same as the end time of the first time determined in the third step which was repeated immediately before,
The surplus power of the first power grid in the second step, which is repeated by the ninth step, is calculated by subtracting the surplus power that is being supplied to the second power grid by the seventh step, Lt; / RTI >
- In the second step, which is repeated by the ninth step, the storage allowance power of the second power network is set to a value obtained by adding the power being supplied from the first power network to the storage allowance power And,
The length of the first time is longer than the time that the ninth step can be repeated once,
Wherein the calculation of the surplus power and the storage allowance power in the second step comprises:
- if there is no energy storage device and there is a distributed power supply and the generated power is greater than the power consumption,
- a power grid having a distributed power source and an energy storage device, wherein said first stored power and said second stored power are absent and said generated power is greater than said consumed power,
- a power grid in which there is a distributed power source and an energy storage device and in which the second stored power is not present and the generated power is greater than the power consumption and the first stored power is smaller than the difference between the generated power and the consumed power, A power network having surplus power of the same size,
* Surplus power = (Generation power - Power consumption) - First storage power
- there is no distributed power source and there is an energy storage device, the power grid with the first stored power and / or the second stored power,
- a power grid having a distributed power source and an energy storage device, said first stored power and / or said second stored power, said generated power not exceeding said power consumption,
- a power grid having a distributed power source and an energy storage device and having the first stored power and the generated power being greater than the power consumption and the difference between the generated power and the consumed power being equal to or less than the first stored power, And a power storage network having a storage power margin of a predetermined size,
* Storage power reserve = First storage power + Second storage power - (Generated power - Power consumption) - Surplus power supplied from other power grid
- for the remaining power grid, the surplus power and the power reserve for the reserved surplus power,
Each of the control systems includes priority information for selecting the second power network when the power network to which the power network belongs belongs to the first power network,
In the fifth step, when the first power network selects the second power network, n (n is an integer of 1 or more) are sequentially selected from a power network having a higher priority according to the priority information, Selecting a value obtained by adding the limit until the sum exceeds the surplus power,
In the fifth step, the supply limit for each of the second power networks defined by the first power network is as follows,
- the (n-1) th second power grid supply limit = the respective storage limit
- nth second power grid supply limit = surplus power - (sum of n-1th supply limits)
Wherein the real-time variation information generated by the first power grid is a real-time variation value of the supply limit for each of the second power grids in the seventh step, and when the surplus power is reduced, When the surplus power is increased, it is increased in ascending order,
In the fifth step, which is repeated by the ninth step, when the first power network selects the second power network, the second power network selected immediately before is selected as a priority regardless of the priority information A method for controlling distributed power trading in a transmission plan view centering on a power grid having surplus power delete delete The method according to claim 1,
Each of the control systems comprising a private key for each of the control systems of its own private key and another power network,
The proposal request signal includes a first hash value obtained by hashing the proposal request, a second hash value including the first hash value in the proposal request, hash value, and the second hash value encrypted with the private key of the first power grid A first authentication code is further included,
The verification of the proposal request signal may be performed by comparing whether the hash value including the first hash value in the proposal request and the value obtained by decoding the first authentication code with the public key of the first power network match However,
The stored proposal signal further includes a third hash value including the second hash value and the second hash value included in the stored proposal,
The proposed acceptance signal further includes a fourth hash value including the third hash value and the third hash value included in the proposed consent,
The reception acknowledgment signal includes a fifth hash value including the fourth hash value, the fourth hash value including the fourth hash value, and the fifth hash value as the private key of the second power network transmitting the acknowledgment signal Further comprising an encrypted second authentication code,
Wherein the verification of the acknowledgment signal comprises comparing a hash value including the fourth hash value with the acknowledgment and a value obtained by decoding the second authentication code with a public key of a second power network transmitting the acknowledgment signal, Compare and verify whether they match,
Wherein the first hash value included in the proposal request signal is the fifth hash value in the third step performed by repeating the ninth step, How to control decentralized power trading from the transmission perspective

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