Power network system

Abstract

To implement a region micro grid in which green power of a region is consumed in the region.SOLUTION: A power network system includes: one or more green power generating stations each provided with a storage battery; one or more power users each provided with a storage battery in a region; a power network; and a region power management control device connected with the green power generating stations and the power users, respectively, through a communication network. The region power management control device creates a region power transmission / reception plan defining a planned transmission power amount and a planned reception power amount on the basis of a predicted demand power amount and a predicted power generation amount, controls the respective green power generating stations so as to perform power transmission of the planned transmission power amount, and controls the respective users so as to perform power reception of the planned reception power amount. When an actual power generation amount of the green power generating stations is smaller than the planned transmission power amount, power transmission is performed from the storage batteries of the green power generating stations. When an actual power reception amount of the users is smaller than the planned reception power amount, surplus reception power is made to be stored in the storage batteries of the users.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This invention relates to a power network system for realizing a regional microgrid that consumes regional green power locally.

Background Art

[0002] Managing power energy for each region has been proposed conventionally. For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2014-96867), in the case where general consumers in a region are configured to be able to generate their own electricity using distributed power sources, a storage battery is installed for each region. When surplus power is generated, the surplus power of the distributed power sources of general consumers is charged to the storage battery, and when power is insufficient, the storage battery is discharged and the power from the storage battery is supplied to general consumers. A system has been proposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the system of Patent Document 1, it is possible to use the power of general consumers equipped with distributed power sources without waste, but the management of power for the entire region including the power generated at the regional power plant is not considered. For this reason, there has been a risk that power with a high "environmental value" (green power) generated by non-fossil power sources such as solar power generation cannot be effectively utilized.

[0005] An object of this invention is to provide a power network system that can solve the above problems.

Means for Solving the Problems

[0006] In order to solve the above problems, the present invention is a power network system for realizing a regional microgrid that consumes regional green power in the region, one or more green power generation plants with batteries provided in the region, one or more power consumers in the region equipped with batteries, a power grid for transmitting and receiving power between the green power generation plant and the power consumers, a regional power management and control device connected to each of the green power generation plant and the power consumers through a communication network, and having the regional power management and control device has a power demand prediction means for predicting the power demand of the consumers in the region, a power generation prediction means for predicting the power generation of the green power generation plants in the region, a power generation prediction means for predicting the power generation of the green power generation plants in the region, and based on the predicted power demand predicted by the power demand prediction means and the predicted power generation predicted by the power generation prediction means, a power transmission and reception plan for the region is created, which determines the planned power transmission amount transmitted from each of the green power generation plants and the planned power reception amount received by each of the consumers. and provides a power network system characterized by comprising control means for controlling each of the green power generation plants to perform power transmission of the planned power transmission amount and controlling each of the consumers to perform power reception of the planned power reception amount.

[0007] In the power network system having the above configuration, the regional power management and control device creates a power transmission and reception plan for the region, which determines the planned power transmission amount transmitted from each of the green power generation plants and the planned power reception amount received by each of the consumers, based on the predicted power demand of the consumers in the region predicted by the power demand prediction means and the predicted power generation of the green power generation plants in the region predicted by the power generation prediction means, by the power generation plan creation means.

[0008] In addition, the control means of the regional power management and control device controls each of the green power generation plants to perform power transmission of the planned power transmission amount, and controls each of the consumers to receive power of the planned power reception amount.

[0009] And, in the power network system of this invention, when the actual power generation amount of the green power generation plant is less than the planned power transmission amount, power is transmitted from the storage battery of the green power generation plant, and when the actual power reception amount at the consumer is less than the planned power reception amount, the excess received power is stored in the storage battery of the consumer.

Advantages of the Invention

[0010] According to this invention, it is possible to realize a regional microgrid that consumes the green power generated by the regional green power generation plants without waste in the region.

[0011] And, in this invention, within the region, by discharging and storing the storage batteries of the green power generation plants and the consumers, it is ensured that no imbalance occurs between the power transmission amount and the power reception amount. For this reason, there is a remarkable effect that the generation of imbalance charges in power transmission and distribution is suppressed.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

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Figure 8

Embodiments for Carrying Out the Invention

[0013] Hereinafter, an embodiment of the power network system according to the present invention will be described with reference to the drawings.

[0014] FIG. 1 is a diagram showing an outline of the configuration of an embodiment of the power network system according to the present invention. The power network system of this embodiment is an example in the case where the green power is only photovoltaic power generation power. However, the green power is not limited to the case of using only photovoltaic power generation power, and wind power generation power, geothermal power generation power, etc. can be used. Further, the power network system can also be configured by mixing and using these various green powers.

[0015] The power network system of this embodiment has a network formed in a predetermined regional range AR in Japan. As shown in FIG. 1, a photovoltaic power generation plant with a storage battery (hereinafter referred to as PV-ESS) 1 installed within the regional range AR, a power consumer 2, a system-side energy storage device (hereinafter referred to as SG-ESS) 3, a power grid (transmission and distribution network) 4 for transmitting and distributing power, a communication network (communication network) 5, the Japan Electric Power Exchange (hereinafter referred to as JEPX) 6, and a regional power management and control device 7. Since the power network system of this embodiment is constructed in a predetermined regional range AR in Japan, the power exchange is JEPX 6. However, when the power network system is constructed in other regions outside Japan, it is composed of a power exchange that conducts power transactions in that region.

[0016] In FIG. 1, the power grid 4 shows each part constituting the power network system of this embodiment connected by solid lines. Also, the communication network 5 shows each part constituting the power network system of this embodiment connected by dotted lines. And in FIG. 1, the power market transactions made through JEPX6 are shown by dashed-dotted lines. In this embodiment, the communication network 5 includes the Internet, and each part is configured to communicate through the communication network 5 by wireless communication in this example. Of course, wired communication may be used instead of wireless communication.

[0017] In the example of FIG. 1, one or more PV-ESS1s are arranged within a predetermined regional range AR. For example, those that transmit power at an extra-high voltage of 66 kV to 157 kV through the local system within the power grid 4 (denoted as PV-ESS1(A) in FIG. 1), and those that transmit power at a normal high voltage of 6.6 kV through the distribution system of the power grid 4 (denoted as PV-ESS1(B) in FIG. 1) are included.

[0018] In this embodiment, each of the PV-ESS1s includes, in addition to a power generation facility using a solar panel 1SL (the solar panel of PV-ESS1(A) is denoted as 1SL(A) and the solar panel of PV-ESS1(B) is denoted as 1SL(B) in FIG. 1), a storage battery 1CB (the storage battery of PV-ESS1(A) is denoted as 1CB(A) and the storage battery of PV-ESS1(B) is denoted as 1CB(B) in FIG. 1). And each of the PV-ESS1s is configured to be able to send the power generated by the power generation facility using the solar panel 1SL directly to the power grid 4 without storing it in the storage battery 1CB, or to send it to the power grid 4 while storing (charging) it in the storage battery 1CB. Also, as will be described later, each of the PV-ESS1s is configured to store (charge) the power from the power grid 4 in the storage battery 1CB based on the control of the regional power management and control device 7, and further to be able to transmit the power stored in the storage battery 1CB through the power grid 4.

[0019] In the description of this specification, when it is necessary to distinguish and describe PV-ESS1(A), battery 1CB(A) from PV-ESS1(B), battery 1CB(B), codes with (A) and (B) added are used. When it is not necessary to distinguish between them, codes without (A) and (B) added are used.

[0020] Next, since there are one or more consumers 2 within a predetermined regional range AR, in the example of FIG. 1, large consumers such as factories and data centers that receive special high-voltage power through the local system of the power grid 4 (described as consumer 2(A) in FIG. 1), high-voltage consumers such as condominiums and facilities that receive power through the distribution system of the power grid 4 (described as consumer 2(B) in FIG. 1), and low-voltage consumers such as detached houses and stores that also receive power through the distribution system of the power grid 4 (described as consumer 2(C) in FIG. 1) are included. Note that the low-voltage consumer 2(C) is stepped down to low voltage by a pole-mounted transformer and distributed.

[0021] In this embodiment, each of the consumers 2 is equipped with a power generation facility using a solar panel 2SL (in FIG. 1, the solar panel of the large consumer 2(A) is described as 2SL(A), the solar panel of the high-voltage consumer 2(B) is described as 2SL(B), and the solar panel of the low-voltage consumer 2(C) is described as 2SL(C)), and a battery 2CB (in FIG. 1, the battery of the large consumer 2(A) is described as 2CB(A), the battery of the high-voltage consumer 2(B) is described as 2CB(B), and the battery of the low-voltage consumer 2(C) is described as 2CB(C)).

[0022] And each of the consumers 2 is configured such that the power received through the distribution system is consumed while being stored (charged) in, for example, the battery 2CB, and the surplus generated power that could not be consumed can be stored in the battery 2CB. Also, each of the consumers 2 is configured such that when no one is at home and there is no power consumption, the surplus power generated by the power generation facility using the solar panel 2SL can be stored in their respective batteries 2CB.

[0023] In the description of this specification, when it is necessary to distinguish and describe large customers 2(A), high-voltage customers 2(B), low-voltage customers 2(C), solar panels 2SL(A), 2SL(B), 2SL(C), and storage batteries 2CB(A), 2CB(B), 2CB(C), the symbols with (A), (B), and (C) added will be used. When it is not necessary to distinguish between the two, the symbols without (A), (B), and (C) added will be used.

[0024] In this embodiment, it is assumed that all customers 2 are equipped with a power generation facility using solar panels 2SL and a storage battery 2CB. However, it may also be configured to include only the storage battery 2CB and not include a power generation facility. In addition, the power generation facility of customer 2 is not limited to a solar power generation facility using solar panels 2SL, and may be other green power generation facilities.

[0025] In this embodiment, 1 to a plurality of SG-ESS3 are provided within a predetermined regional scope AR. Note that in this invention, it is also possible to configure the system without providing this SG-ESS3. SG-ESS3 is equipped with a storage battery 3CB and is configured to be able to store (charge) the power received from the power grid 4 and also transmit (discharge) the stored power.

[0026] The regional power management and control device 7 is a device for managing and controlling so that the green power generated in a predetermined regional scope AR, which is solar power generation power in this embodiment, can be consumed without waste within the regional scope AR. In this embodiment, the regional power management and control device 7 is composed of a computer and executes various processes as described later through software processing using AI (Artificial Intelligence).

[0027] In this embodiment, the local power management and control device 7 is owned and operated by a power retailer that supplies power under contract to one or more consumers 2 within a predetermined local area AR. In this embodiment, the power retailer also owns a PV-ESS1, or has a contract for receiving power supply from a person who owns a PV-ESS1 and for controlling the supply thereof. Further, in this embodiment, the power retailer also owns an SG-ESS3, or has a contract for using the SG-ESS3 with a person who owns the SG-ESS3. Furthermore, in this embodiment, the power retailer that operates the local power management and control device 7 has a contract for power transmission and distribution with a business operator that performs power transmission and distribution using the power grid 4.

[0028] As shown in FIG. 1, the local power management and control device 7 in this embodiment is connected to each of the PV-ESS1, the consumer 2, the SG-ESS3, and the JEPX6 through a communication network 5. The local power management and control device 7 acquires necessary predetermined information from each part connected through the communication network 5, and supplies a control signal CTL for controlling each of those parts, thereby enabling the green power generated within the predetermined local area AR, which is solar power generation in this embodiment, to be consumed without waste within the local area AR, and moreover, enabling the green power to be supplied to consumers at low cost through management and control. That is, according to the power network system of this embodiment, a local microgrid that consumes local green power locally can be realized.

[0029] FIG. 2 is a diagram showing a state in which the local power management and control device 7 is connected to each of the PV-ESS1 (A), PV-ESS1 (B), large consumer 2 (A), high-voltage consumer 2 (B), low-voltage consumer 2 (C), SG-ESS3, JEPX6, and other necessary information sources, which is the Meteorological Agency 8 in this example, through the communication network 5. Using this FIG. 2, various information exchanged between the local power management and control device 7 and them and the control signal CTL to each part will be described, and an outline of the control operation by the local power management and control device 7 will be described.

[0030] In this embodiment, each of PV-ESS1(A), PV-ESS1(B), large customer 2(A), high-voltage customer 2(B), low-voltage customer 2(C), and SG-ESS3 has the function of a so-called smart meter.

[0031] PV-ESS1(A) and PV-ESS1(B) send the generated power data and the SOC (State of Charge) of storage batteries 1CB(A) and 1CB(B) to the regional power management control device 7 in real time. Large customer 2(A), high-voltage customer 2(B), and low-voltage customer 2(C) send the generated power of the power generation facility using solar panels 2SL, the power consumption in large customer 2(A), high-voltage customer 2(B), and low-voltage customer 2(C), and the SOC of storage batteries 2CB(A), 2CB(B), and 2CB(C) to the regional power management control device 7 in real time. SG-ESS3 sends the SOC to the regional power management control device 7 in real time.

[0032] The regional power management control device 7 stores and accumulates in the storage unit the generated power obtained from each of PV-ESS1(A) and PV-ESS1(B), and the power consumption from each of large customer 2(A), high-voltage customer 2(B), and low-voltage customer 2(C), in association with identification information for identifying what the source of the generated power and power consumption is, the date, time, and weather data at the time of obtaining the generated power and power consumption. In addition, the regional power management control device 7 also stores and accumulates in the storage unit the SOC data of storage batteries 1CB(A), 1CB(B), storage batteries 2CB(A), 2CB(B), and 2CB(C), in association with the identification information of the corresponding storage battery, the date, time, and weather data at the time of obtaining the SOC data. Further, the regional power management control device 7 similarly stores and accumulates the SOC data of SG-ESS3 in the storage unit in association with the identification information of SG-ESS3, the date, time, and weather data at that time. Note that the weather data is obtained by the regional power management control device 7 accessing the Japan Meteorological Agency 8.

[0033] Then, the regional power management and control device 7 predicts the power generation amounts of PV-ESS1(A) and PV-ESS1(B) based on the past data of the power generation amounts from PV-ESS1(A) and PV-ESS1(B) stored and accumulated in the storage unit, and the weather data (solar radiation amount prediction data) accessed and obtained from the Japan Meteorological Agency 8. In this case, when the regional power management and control device 7 receives a notification such as a failure from PV-ESS1, it also takes that into account when predicting the power generation amount.

[0034] In this case, from the Japan Meteorological Agency 8, weather data (solar radiation amount prediction data) every hour can be obtained in units of 2 km meshes in the relevant regional area AR. Information on the installation positions (ranges) of each of PV-ESS1(A) and PV-ESS1(B) is stored in the regional power management and control device 7, and the regional power management and control device 7 acquires the weather data (solar radiation amount prediction data) in the meshes of the areas where PV-ESS1(A) and PV-ESS1(B) are installed respectively, in this example, from two days ahead to one hour before, and uses it for prediction. Incidentally, the prediction accuracy of the current weather data (solar radiation amount prediction data) is about 90%.

[0035] Also, the regional power management and control device 7 predicts the demand amounts in large customers 2(A), high-voltage customers 2(B), and low-voltage customers 2(C) based on the past data of the power consumption amounts of customer 2 stored and accumulated in the storage unit. When the regional power management and control device 7 predicts the demand amount of customer 2, it also refers to the SOC of the storage battery 2CB of customer 2 for prediction.

[0036] Then, the regional power management and control device 7 determines, in the regional area AR, a power transmission and reception plan for the region such that the sum of the planned power transmission amounts transmitted from each of PV-ESS1(A) and PV-ESS1(B) and the sum of the planned power reception amounts received by each of large customers 2(A), high-voltage customers 2(B), and low-voltage customers 2(C) match, based on the predicted power generation amount (predicted power generation) and the predicted demand amount (predicted demand power amount).

[0037] That is, for example, the planned power transmission amount transmitted from PV-ESS1(A) is determined so as to match the predicted power consumption amount of the large customer 2(A). In this case, when the predicted power generation amount of the power generation facility of PV-ESS1(A) is less than the predicted power consumption amount of the large customer 2(A), it is planned to transmit the insufficient power amount from the storage battery 1CB(A) of PV-ESS1(A). Also, when the predicted power generation amount of the power generation facility of PV-ESS1(A) is greater than the predicted power consumption amount of the large customer 2(A), the surplus generated power is planned to be stored in the storage battery 1CB(A) of PV-ESS1(A). Thereby, even if the predicted power generation amount of the power generation facility of PV-ESS1(A) is different from the predicted power consumption amount of the large customer 2(A), PV-ESS1(A) can utilize the generated power without waste and transmit the planned power transmission amount.

[0038] On the other hand, when the actual power consumption amount of the large customer 2(A) is less than the predicted power consumption amount during the execution of the power transmission and reception plan, the surplus power transmission is controlled to be stored in the storage battery 2CB(A) of the large customer 2(A). Also, when the actual power consumption amount of the large customer 2(A) is more than the predicted power consumption amount, the shortage is controlled to be covered by the power stored in the storage battery 1CB(A) of the large customer 2(A). Thereby, in the customer 2(A), by only receiving the planned power transmission amount from PV-ESS1(A), together with charging and discharging in the storage battery 2CB, the demand can be covered.

[0039] Also, in this embodiment, the planned power transmission amount transmitted from PV-ESS1(B) and, if necessary, from SG-ESS3 is determined so as to match the predicted power consumption amounts of the high-voltage customer 2(B) and the low-voltage customer 2(C). That is, if the planned power transmission amount that matches the predicted power consumption amounts of the high-voltage customer 2(B) and the low-voltage customer 2(C) can be transmitted from PV-ESS1(B), SG-ESS3 is not used. In this case, the power amount that can be transmitted from PV-ESS1(B) also includes the power amount stored in the storage battery 1CB(B).

[0040] By using the storage battery 1CB(B) of the PV-ESS1(B), in the same manner as described above, even if the power generation amount of the PV-ESS1(B) is more or less than the planned power transmission amount, the planned power transmission amount is transmitted to the power grid 4.

[0041] Also, when executing the power transmission and reception plan, in the same manner as described above, by using the storage batteries 1CB(B) and 1CB(C) of the high-voltage consumer 2(B) and the low-voltage consumer 2(C), even if the actual power consumption amount at the high-voltage consumer 2(B) and the low-voltage consumer 2(C) is more or less than the predicted power demand amount, the power demand can be met only by receiving the planned power transmission amount.

[0042] In this embodiment, the regional power management control device 7 generates a control signal CTL for controlling the power transmission of the planned power transmission amount based on the created power transmission and reception plan and the reception thereof on the consumer 2 side, and supplies it to each of the PV-ESS1(A), PV-ESS1(B), SG-ESS3, the large consumer 2(A), the high-voltage consumer 2(B), and the low-voltage consumer 2(C) so as to perform the above-described control.

[0043] In this case, the regional power management control device 7 acquires the real-time data of the power generation amount from the PV-ESS1(A) and PV-ESS1(B) and the real-time data of the discharge power amount from the SG-ESS3 through the communication network 5, creates the control signal CTL so as to perform the above control while monitoring the actually transmitted power amount, and transmits it to each part of the PV-ESS1(A), PV-ESS1(B), and SG-ESS3.

[0044] The regional power management control device 7 also acquires the real-time data of the power consumption amount (including the power storage power to the storage batteries 2CB(A), 2CB(B), and 2CB(C)) from each of the large consumer 2(A), the high-voltage consumer 2(B), and the low-voltage consumer 2(C) through the communication network 5, creates the control signal CTL so as to perform the above control while monitoring the actually transmitted and used power amount, and transmits it to each part of the large consumer 2(A), the high-voltage consumer 2(B), and the low-voltage consumer 2(C).

[0045] As described above, according to the power network system of this embodiment, even if the predicted power generation amount and / or the predicted power demand amount differ from the actual power generation amount and / or the actual power consumption amount, the power transmitted through the power grid 4 becomes the planned power transmission amount. Moreover, also on the consumer 2 side, the apparent power consumption amount matches the planned power transmission amount, so an imbalance, which is the difference between the power generation plan and the demand actual result, does not occur. Therefore, there is an effect that the imbalance charge for the power transmission and distribution business operator operating the power grid 4 becomes unnecessary.

[0046] And in the power network system of this embodiment, by providing the SG-ESS3, even when the power supply in the regional range AR is insufficient due to reasons such as continuous bad weather in the region in the power generation by the PV-ESS1(A) and the PV-ESS1(B), it is possible to maintain the power supply in the regional range AR as much as possible.

[0047] In this case, in the power network system of this embodiment, the regional power management control device 7 acquires data on the power trading price in the regional range AR from the JEPX6, and when the trading price is low, preferably the lowest price, it buys power from the JEPX6 and stores it in the SG-ESS3. FIG. 3 shows the daily change in the power trading price. As shown in this FIG. 3, generally, the power trading price often has a low price (the lowest price), for example, 0.1 yen or less, from 8:00 am to 4:00 pm of the day. Therefore, in this embodiment, the regional power management control device 7 purchases power from the JEPX6 during the time period when the price is low (the lowest price) in this way and stores it in the storage battery 3CB of the SG-ESS3.

[0048] Then, the regional power management and control device 7 monitors the SOC of the battery 3CB of SG-ESS3, and acquires and monitors the data of the power trading price in the regional scope AR from JEPX6. When the SOC indicates a stored power amount equal to or greater than a predetermined value, for example, when it indicates that the stored power amount has reached 95%, if the trading price of JEPX6 is high, it is predicted that the power stored in the battery of SG-ESS3 needs to be included in the aforementioned planned power transmission amount in the regional scope AR. After leaving the portion that needs to be included, sell the electricity. For example, during the hours from 0:00 to 8:00 and from 16:00 to 24:00 when the trading price shown in FIG. 3 is high, sell the power stored in the battery of SG-ESS3.

[0049] Also, in this embodiment, the regional power management and control device 7 monitors the SOC of the battery 1CB of PV-ESS1. When the SOC is equal to or less than a predetermined value, for example, 30% or less, or when it is not fully charged by power generation until selling electricity or discharging to consumers, when the trading price of JEPX6 is at a low price (the lowest price), it controls to purchase (buy) power and charge the battery 1CB with the power from the power grid 4. Further, when the SOC of PV-ESS1 is equal to or greater than a predetermined value, for example, 95% or more, when the trading price of JEPX6 is high, it sells the power, discharges the battery 1CB, and sends it to the power grid 4.

[0050] In this way, by selling the surplus stored power at a high trading price, the difference between the power purchased for storing power at a low trading price can be obtained as a profit, which helps to set the electricity price for consumers 2 within the regional scope AR at a low price. In the power network system of this embodiment, the fact that no imbalance fee occurs in the power transmission and distribution of the planned power transmission amount based on the power transmission and reception plan of the regional scope AR also helps to set the electricity price for consumers 2 within the regional scope AR at a low price.

[0051] And, as described above, in this embodiment, when the trading price of JEPX6 is low, the regional power management and control device 7 purchases electricity and stores (charges) the electricity from the battery 1CB and the power grid 4 in the battery 3CB, and when the trading price is high, it sells electricity and discharges from the battery 1CB and the battery 3CB to send it to the power grid 4. Then, since the regional power management and control device 7 continuously purchases electricity when it is cheap and sells electricity when it is expensive, there is an effect that the trading price in the area where this power network system is constructed stabilizes at a price between the electricity purchase price and the electricity selling price. Furthermore, there is an effect that the power supply and demand balance stabilizes and the frequency fluctuation and voltage fluctuation of the power disappear.

[0052] Also, in the power network system of this embodiment, when the SOC of the battery 1CB of PV-ESS1 shows a stored power amount equal to or more than a predetermined value, for example, when it shows that the stored power amount has reached 95%, the regional power management and control device 7 supplies the surplus power to another PV-ESS1 having a margin for power storage in the battery 1CB, or SG-ESS3 having a margin for power storage, or the consumer 2 having a margin for power storage in the battery 2CB, and controls to store the power.

[0053] Furthermore, when the SOC of the battery 2CB of the consumer 2 shows a stored power amount equal to or more than a predetermined value, for example, when it shows that the stored power amount has reached 95%, the regional power management and control device 7 supplies the surplus stored power to SG-ESS3 having a margin for power storage, or another consumer 2 having a margin for power storage in the battery 2CB, and controls to store the surplus power.

[0054] As described above, in the power network system of this embodiment, within the regional range AR, the surplus green power is stored in the battery within the regional range AR so that it can be utilized without waste within the regional range AR.

[0055] In addition, when the SOC of the storage battery of SG-ESS3 indicates a power storage amount equal to or greater than a predetermined value, for example, when it indicates that the power storage amount has reached 95%, the regional power management control device 7 may not sell the surplus power for power storage as described above, but may control to transmit the surplus power to another SG-ESS3 with sufficient power storage capacity or to the consumer 2 with sufficient power storage capacity in the storage battery 2CB.

[0056] Also, within the regional scope AR, when there is surplus green power and the storage capacity within the region is full and it is not possible to transfer to other storage batteries as described above, the regional power management control device 7 may sell the surplus power through JEPX6. Also in this case, the regional power management control device 7 monitors the transaction price data of JEPX6 and predicts the transaction price from past transaction price data, weather, season, day of the week, etc., and sells the power at a high price.

[0057] And in the power network system of this embodiment, the regional power management control device 7 centrally manages the power transmission and distribution of green power within the regional scope AR as described above, and creates and manages the ledger data of the power transmission and distribution. In this ledger data, information regarding the power generation amount (power transmission amount) of green power is associated and included as information for identifying the PV-ESS1 as the power generation source and other attribute information to enable tracking. Green power is power with a high environmental value that does not involve CO2 generation and can obtain environmental value certificates such as attribute-based renewable energy certificates. Therefore, the ledger data for such green power with a high environmental value needs to ensure security as it is difficult to falsify.

[0058] Therefore, the regional power management and control device 7 of this embodiment manages the ledger data for green power by performing encryption processing that is difficult to tamper with, specifically, processing using blockchain technology in this example. For example, in this embodiment, the regional power management and control device 7 shares a part of the database of the ledger data with PV-ESS1(A), 1(B), large customers 2(A), high-voltage customers 2(B), and low-voltage customers 2(C), and creates and manages the ledger data for a predetermined period such as one day using blockchain technology.

[0059] In this case, for example, there is an attribute-based renewable energy certificate as an example of proving environmental value. By registering in advance the attribute information necessary for certificate issuance, such as the ID and location of PV-ESS1, with the issuing authority of the attribute-based renewable energy certificate, it is possible to obtain an attribute-based renewable energy certificate for the green power managed in the power network system of this embodiment and use it for the transaction of the environmental value of the green power.

[0060] Then, the regional power management and control device 7 can sell, for example, the environmental value of the generated power (green power) of PV-ESS1 managed in the ledger at a green power trading platform upon receiving a request from the owner of PV-ESS1. An example of the transaction of the environmental value of green power (renewable energy power) through the trading platform will be described below.

[0061] In this case, the owner of PV-ESS1 or the regional power management and control device 7 on behalf of PV-ESS1 registers power generation-related information (attribute information of green power (renewable energy power)), such as the power generation location, power generator (company, individual), power generation method, power generation amount, and power generation period, with the trading platform. Then, the certification authority authenticates the power generation-related information. After authenticating the power generation-related information, the certification authority registers an attribute-based renewable energy certificate for the authenticated green power (renewable energy power) in the trading account of the trading platform.

[0062] A buyer who wishes to purchase the environmental value of green power (renewable energy power) selects one or more attributed renewable energy certificates to buy from the trading accounts on the trading platform. Then, the trading platform invalidates the name, depreciation, and attributed renewable energy certificates of the selected attributed renewable energy certificates, and issues a renewable energy depreciation certificate to the buyer. Through the above process, the environmental value of green power (renewable energy power) is transferred to the buyer. In this case, the buyer pays the consideration for the environmental value.

[0063] As described above, when the regional power management and control device 7 receives the consideration for the environmental value of green power (renewable energy power), it transfers the consideration to the owner of PV-ESS1 (the power generator (company, individual)).

[0064] Next, a configuration example of each part of the power network system of this embodiment will be described.

[0065] FIG. 4 is a block diagram showing a configuration example of PV-ESS1. PV-ESS1 includes a power generation facility 10 using a large number of solar panels 1SL. In this example, the power generation facility 10 is capable of generating 2.3 to 3 MW of electricity. This power generation facility 10 is connected to a processing control unit 12 via a solar power conditioner (hereinafter referred to as PV-PCS) 11. As is well known, PV-PCS11 performs processes such as converting the DC power generated by the power generation facility 10 into AC power and transforming it to the voltage to be sent to the power grid 4.

[0066] In addition, PV-ESS1 includes a power storage device unit 13 including a storage battery 1CB. The power storage device unit 13 is provided with a battery management and control unit (hereinafter referred to as BMS) 130 having functions such as overcharge protection, over-discharge protection, temperature management, battery remaining capacity management, and detection of battery remaining capacity (SOC) of the storage battery 1CB. In this example, the power storage capacity of the power storage device unit 13 using the storage battery 1CB is about three times the output of the power generation facility 10, and considering the degradation rate, it is 7 to 8 MWh.

[0067] The energy storage device unit 13 is connected to the processing control unit 12 via a power conditioner for a storage battery (hereinafter referred to as SG-PCS) 14. During power storage (charging), the SG-PCS 14 transforms the voltage of the power from the PV-PCS 11 generated at the power generation facility 10 or the voltage received from the power grid 4 into a voltage for power storage, and converts AC power into DC power, etc. Also, during discharge, conversely, the energy storage device unit 13 performs a process of converting the DC stored power of the energy storage device unit 13 into AC power and transforming it into a voltage to be sent to the power grid 4.

[0068] The processing control unit 12 is connected to the communication network 5 through the communication unit 15 and is also connected to the power grid 4. And the processing control unit 12 includes a switching unit for the supply line of the generated power output from the PV-PCS 11 to the power grid 4 and the power line connected to the SG-PCS 14, and as a processing function unit, includes a transmission / reception information processing unit 121, a smart meter function unit 122, a power supply control unit 123, and a charge / discharge control unit 124.

[0069] The transmission / reception information processing unit 121 of the processing control unit 12 generates information to be transmitted to the regional power management control device 7 through the communication unit 15, analyzes the control information CTL received from the regional power management control device 7 through the communication unit 15, and performs a process of sending it to other functional units.

[0070] The smart meter function unit 122 generates information on the amount of power generated at the power generation facility 10 and passes it to the transmission / reception information processing unit 121. The smart meter function unit 122 also receives information on the SOC of the storage battery 1CB from the BMS 130 of the energy storage device unit 13 and passes it to the transmission / reception information processing unit 121. The transmission / reception information processing unit 121 transmits the information on the amount of power and the SOC information to the regional power management control device 7 through the communication unit 15.

[0071] Based on the control signal CTL received from the regional power management control device 7 by the transmission / reception information processing unit 121, the power supply control unit 123 controls the operation of transmitting the generated power from the PV-PCS 11 through the power grid 4 and the operation of transmitting the stored power from the SG-PCS 14 through the power grid 4. Also, the power supply control unit 123 can control to perform an operation of synthesizing the generated power from the PV-PCS 11 and the stored power from the SG-PCS 14 and transmitting it through the power grid 4.

[0072] When the control signal CTL received from the regional power management control device 7 by the transmission / reception information processing unit 121 is an instruction to transmit the stored power from the energy storage device unit 13 through the power grid 4 (including the case of synthesizing the generated power from the PV-PCS 11 and the stored power from the SG-PCS 14 and transmitting it through the power grid 4), the charge / discharge control unit 124 controls the SG-PCS 14 and the energy storage device unit 13 to discharge the stored power from the storage battery 1CB and transmit it through the power grid 4.

[0073] Also, when the control signal CTL received from the regional power management control device 7 by the transmission / reception information processing unit 121 is an instruction to charge the storage battery 1CB with the generated power from the PV-PCS 11, the charge / discharge control unit 124 controls to supply the power output from the PV-PCS 11 to the SG-PCS 14 and controls the SG-PCS 14 and the energy storage device unit 13 to perform an operation of storing (charging) the storage battery 1CB.

[0074] Furthermore, when the control signal CTL received from the regional power management control device 7 by the transmission / reception information processing unit 121 is an instruction to store (charge) the power from the power grid 4 in the storage battery 1CB, the charge / discharge control unit 124 controls to supply the power received from the power grid 4 to the SG-PCS 14 and controls the SG-PCS 14 and the energy storage device unit 13 to perform an operation of storing (charging) the storage battery 1CB.

[0075] Although not shown in FIG. 4, the processing control unit 12 also includes a processing function unit for distributed ledger management using blockchain technology. That is, it notifies the regional power management control device 7 of the amount of power generated by itself (PV-ESS1), and encrypts and manages some ledger data for that amount.

[0076] Next, a configuration example of SG-ESS3 will be described. FIG. 5 is a block diagram showing a configuration example of SG-ESS3. SG-ESS3 includes a power storage device unit 31 having a storage battery 3CB. The power storage device unit 31 is provided with a BMS 310 having functions such as overcharge protection, over-discharge protection, temperature management, battery remaining capacity management, and detection of battery remaining capacity (SOC) of the storage battery 3CB. In this example, the power storage capacity of the power storage device unit 31 using the storage battery 3CB is, for example, about 7 to 8 MWh, which is about the same as that of the power storage device unit 13 of PV-ESS1.

[0077] The power storage device unit 31 is connected to the processing control unit 33 via SG-PCS32. SG-PCS32 converts the DC power stored in the power storage device unit 31 into AC power during discharge, steps up the voltage to be sent to the power grid 4, and conversely, steps down the voltage received from the power grid 4 to the voltage for power storage and converts the AC power into DC power during power storage (charging).

[0078] The processing control unit 33 is connected to the communication network 5 through the communication unit 34 and is also connected to the power grid 4. The processing control unit 33 includes, as processing function units, a transmission / reception information processing unit 331, a smart meter function unit 332, and a charge / discharge control unit 333.

[0079] The transmission / reception information processing unit 331 of the processing control unit 33 generates information to be transmitted to the regional power management control device 7 through the communication unit 34, analyzes the control information CTL received from the regional power management control device 7 through the communication unit 34, and performs processing to send it to the charge / discharge control unit 333.

[0080] The smart meter functional unit 332 receives the SOC information of the storage battery 3CB from the BMS 310 of the power storage device unit 31 and passes it to the transmission / reception information processing unit 331. The transmission / reception information processing unit 331 transmits the SOC information to the regional power management control device 7 through the communication unit 34.

[0081] When the control signal CTL received from the regional power management control device 7 by the transmission / reception information processing unit 331 is a control instruction to transmit the stored power from the power storage device unit 31 through the power grid 4, the charge / discharge control unit 333 controls the SG-PCS 32 and the power storage device unit 31 to perform an operation of discharging the stored power from the storage battery 3CB and transmitting it through the power grid 4.

[0082] Also, when the control signal CTL received from the regional power management control device 7 by the transmission / reception information processing unit 331 is a control instruction to store (charge) the power from the power grid 4 in the storage battery 3CB, the charge / discharge control unit 333 controls to supply the power received from the power grid 4 to the SG-PCS 32, and controls the SG-PCS 32 and the power storage device unit 31 to perform an operation of storing (charging) the storage battery 3CB.

[0083] In this embodiment, the SG-ESS 3 is not provided with a green power generation facility. However, for example, a power generation facility using a solar panel may be provided to charge the storage battery 3CB with the generated power. In that case, in order to avoid the direct influence of rainfall and snow accumulation on the SG-ESS 3 facility, a roof-shaped structure may be installed above the SG-ESS 3 facility, and solar panels may be arranged thereon. With this configuration, the charging of the storage battery 3CB of the SG-ESS 3 is performed by both the power purchased from the power grid 4 and the power generated by the solar panels, so that there is an effect that the amount of power purchased from the power grid 4 can be reduced.

[0084] Next, a configuration example of the consumer 2 will be described. FIG. 6 is a block diagram showing a configuration example of the consumer 2. The consumer 2 is provided with a power generation facility 20 using a solar panel 2SL. In this example, the power generation facility 20 is assumed to generate electric power in amounts corresponding to each of the large-scale consumer 2(A), high-voltage consumer 2(B), and low-voltage consumer 2(C).

[0085] The power generation facility 20 is connected to the processing control unit 22 via the PV-PCS 21. The PV-PCS 21 converts the DC power generated by the power generation facility 20 into AC power and transforms it to a voltage that can be used for self-consumption and, in this example, for charging the storage battery 2CB.

[0086] Also, the consumer 2 is provided with a power storage device unit 23 including a storage battery 2CB. The power storage device unit 23 is provided with a BMS 230 having functions such as overcharge protection, over-discharge protection, temperature management, battery remaining capacity management, and detection of the state of charge (SOC) of the storage battery 2CB. In this example, the power storage capacity of the power storage device unit 23 using the storage battery 2CB is, for the large-scale consumer 2(A), equivalent to several hours' worth of the daily power demand, for example, 7 to 10 MWh; for the high-voltage consumer 2(B), considering power outages during disasters, it is the power consumption for half a day to one day, for example, 300 to 2000 kWh; and for the low-voltage consumer 2(C), it is, for example, 5 to 15 kWh.

[0087] The power storage device unit 23 is connected to the processing control unit 22 via the SG-PCS 24. The SG-PCS 24, during power storage (charging), transforms the voltage of the power generated by the power generation facility 20 from the PV-PCS 21 or the voltage of the power received from the power grid 4 to a voltage for power storage and converts the AC power into DC power. Also, during discharge, conversely, it performs a process of converting the DC stored power of the power storage device unit 23 into AC power and transforming it to a voltage for self-consumption by the consumer 2 or for sending to the power grid 4.

[0088] The processing control unit 22 is connected to the communication network 5 through the communication unit 25 and is also connected to the power grid 4. Further, the processing control unit 22 is connected to the power load device 27 through the switchboard 26. And the processing control unit 22 includes, as processing functional units, a transmission / reception information processing unit 221, a smart meter functional unit 222, a power reception control unit 223, and a charge / discharge control unit 224.

[0089] The transmission / reception information processing unit 221 of the processing control unit 22 generates information to be transmitted to the regional power management control device 7 through the communication unit 25, analyzes the control information CTL received from the regional power management control device 7 through the communication unit 25, and performs processing to send it to other functional units.

[0090] The smart meter functional unit 222 detects the amount of power received from the power grid 4 and passes the information on the detected amount of power to the transmission / reception information processing unit 221. Also, the smart meter functional unit 222 receives the SOC information of the storage battery 2CB from the BMS 230 of the energy storage device unit 23 and passes it to the transmission / reception information processing unit 221. The transmission / reception information processing unit 221 transmits the information on the amount of power and the SOC information to the regional power management control device 7 through the communication unit 25.

[0091] Based on the control signal CTL received from the regional power management control device 7 by the transmission / reception information processing unit 221, the power reception control unit 223 controls the power received through the power grid 4 to be used for self - consumption, and also controls the charging (power storage) and discharging of the energy storage device unit 23. For example, when the power generated from the power generation facility 20 is sufficient for self - consumption, the power generation facility 20 supplies the generated power to the power load device 27 through the switchboard 26, and the power received through the power grid 43 is charged to the energy storage device unit 23. Also, when the power generated from the power generation facility 20 is not sufficient for self - consumption, the received power obtained through the power grid 43 makes up for the shortfall, and the received power obtained through the power grid 43 that is not used for self - consumption is charged to the energy storage device unit 23.

[0092] When the control signal CTL received by the power reception control unit 223 from the regional power management control device 7 instructs to store (charge) the power received through the power grid 4 in the power storage device unit 23, the power reception control unit 223 stores the received power in the storage battery 2CB of the power storage device unit 23 in conjunction with the control of the charge / discharge control unit 224.

[0093] When the control signal CTL received by the transmission / reception information processing unit 221 from the regional power management control device 7 is an instruction to store (charge) the power from the power grid 4 in the storage battery 2CB, the charge / discharge control unit 224 controls to supply the power received from the power grid 4 to the SG-PCS 24, and also controls the SG-PCS 24 and the power storage device unit 23 to perform an operation of storing (charging) the storage battery 2CB.

[0094] Also, when the control signal CTL received by the transmission / reception information processing unit 121 from the regional power management control device 7 is an instruction to send out the stored power from the power storage device unit 23 through the power grid 4, the charge / discharge control unit 224 controls the SG-PCS 24 and the power storage device unit 23 to perform an operation of discharging the stored power from the storage battery 2CB and sending power through the power grid 4.

[0095] Next, a configuration example of the regional power management control device 7 will be described. FIG. 7 is a block diagram showing a configuration example of the regional power management control device 7. The regional power management control device 7 is configured by connecting a communication unit 71 to a processing control unit 70 composed of a computer. The processing control unit 70 is connected to the communication network 5 through the communication unit 71.

[0096] The processing control unit 70 of the regional power management control device 7 includes, as processing function units, a transmission / reception information processing unit 701, a generated power storage management unit 702, a demand storage management unit 703, an SOC storage management unit 704, a power transmission and reception plan creation unit 705, a power transmission and reception plan execution unit 706, a storage battery power selling management unit 707, and a power ledger management unit 708. As described above, these processing function units are configured as software processing functions using AI.

[0097] The transmission / reception information processing unit 701 generates information to be transmitted from the regional power management control device 7 through the communication unit 71, analyzes the information received from each unit through the communication unit 71, and performs processing to send it to each unit of the processing control unit 70.

[0098] The power generation amount storage management unit 702 buffers the real-time power generation amounts received from each of the PV-ESS1s through the communication unit 71, and stores the information on the power generation amounts in the past, for example, in units of 1 hour or 1 day, in association with identification information for identifying which power generation amount of the PV-ESS1 it is. Also, the power generation amount storage management unit 702 buffers the real-time power transmission amounts received from the SG-ESS3, and stores the information on the power transmission amounts in the past, for example, in units of 1 hour or 1 day, in association with the identification information of the SG-ESS3. In this case, the power generation amount storage management unit 702 also stores the information on the past power generation amounts and power transmission amounts in association with the meteorological data (solar radiation amount data) at the corresponding time or during the corresponding period, which was acquired through the communication unit 71.

[0099] The demand amount storage management unit 703 stores the information on the real-time power reception amounts received from each of the consumers 2 through the communication unit 71 and the sum of the power reception amounts in the past, for example, in units of 1 day, in association with the identification information of each of the consumers 2.

[0100] The SOC storage management unit 704 stores the SOC information received from each of the PV-ESS1s, the SG-ESS3, and each of the consumers 2 through the communication unit 71 in association with the identification information of each of the PV-ESS1s, the SG-ESS3, and each of the consumers 2.

[0101] The power transmission and reception plan creation unit 705 creates a power transmission and reception plan from the past power generation amount data of the PV-ESS1 and the power transmission amount data from the SG-ESS3 stored in the power generation amount storage management unit 702, the SOC information stored in the SOC storage management unit 704, and the meteorological data (solar radiation amount data) forecasted for the date and time when the power transmission and reception plan is created, which is acquired from the Meteorological Agency 8 through the communication unit 71. In this example, a power transmission and reception plan for the next day is created.

[0102] FIG. 8 is a block diagram showing a functional configuration example of the power transmission and reception plan creation unit 705. The power transmission and reception plan creation unit 705 includes an information acquisition unit 7051, a prediction unit 7052, and a power transmission and reception plan creation output unit 7053.

[0103] The information acquisition unit 7051 acquires the weather data for the next day from the Meteorological Agency 8, the past power generation amount and the past demand amount from the power generation amount storage management unit 702, and the SOC information from the SOC storage management unit 702, and passes them to the prediction unit 7052. As described above, as the weather data (solar radiation amount data) for the next day, the weather data (solar radiation amount data) in mesh units at the position where the PV-ESS1 is installed is acquired in units of one hour.

[0104] The prediction unit 7052 includes a demand prediction unit 70521, a power generation amount prediction unit 70522, and a battery remaining amount prediction unit 70523. The demand prediction unit 70521 predicts and obtains the respective demand amounts (predicted demand amounts) of the demand side 2 for the next day based on the information on the past demand amounts from the information acquisition unit 7051, various information affecting the use of electricity such as day of the week and family composition. In this case, as described above, the demand prediction unit 70521 also refers to the SOC of the storage battery 2CB of the demand side 2 to predict the demand amount. The power generation amount prediction unit 70522 predicts and obtains the respective power generation amounts (predicted power generation amounts) of the PV-ESS1 for the next day. The battery remaining amount prediction unit 70523 predicts the SOC (remaining battery amount) of the respective storage batteries 1CB of the PV-ESS1, the storage battery 3CB of the SG-ESS3, and the storage battery 2CB of the demand side 2 for the next day.

[0105] The prediction unit 7052 passes the predicted demand amount, the predicted power generation amount, and the predicted SOC information obtained by prediction to the power transmission and reception plan creation output unit 7053.

[0106] The power transmission and reception plan creation output unit 7053 determines the power transmission amount from each of the PV-ESS1s and the power transmission amount from the SG-ESS3 to the next day, as well as the received power amount of each of the consumers 2 that are the power reception destinations of the power transmission amount, based on the received predicted demand amount, predicted power generation amount, and predicted SOC information, and creates a power transmission and reception plan. Then, the power transmission and reception plan creation output unit 7053 passes the created power transmission and reception plan to the power transmission and reception plan execution unit 706.

[0107] On the execution day of the power transmission and reception plan, the power transmission and reception plan execution unit 706 generates and supplies a control signal CTL based on the power transmission and reception plan to each of the PV-ESS1s, the SG-ESS3, and each of the consumers 2.

[0108] In this case, for each of the PV-ESS1s, the power transmission and reception plan execution unit 706 monitors the real-time power generation amount from each of the PV-ESS1s and controls it so that the power transmission amount becomes the planned power transmission amount. That is, when the real-time power generation amount from the PV-ESS1 reaches the planned power transmission amount, the PV-ESS1 is controlled so that the subsequent generated power is stored in the battery 1CB. Also, as a result of monitoring the real-time power generation amount from the PV-ESS1, if the power generation amount becomes zero, the stored power of the battery 1CB is sent to the power grid 4, and it is controlled so that the total power transmission amount including the amount transmitted until then becomes the planned power transmission amount.

[0109] In addition, the power transmission and reception plan execution unit 706 monitors the real-time power consumption of each of the consumers 2 and controls so that the received power amount becomes the planned power transmission amount. That is, when the demand (power consumption) of the consumer 2 disappears before the real-time power consumption amount from the consumer 2 reaches the planned received power amount, for the consumer 2, the subsequent power transmission power is controlled to be stored in the storage battery 2CB. Further, as a result of monitoring the real-time power consumption amount from the consumer 2, when the demand (power consumption) at the consumer 2 continues even after the power transmission of the planned received power amount is completed, the stored power of the storage battery 2CB is controlled to be used for the power consumption at the consumer 2. Note that at the consumer 2, when there is power generated from the power generation facility 20, the received power for the planned received power amount is used as the power used (consumed power) together with the generated power. In this case, the received power and the generated power may be used while the storage battery 2CB is charged (stored) by the received power and the generated power.

[0110] The storage battery power selling management unit 707 monitors the SOC of the storage batteries 1CB, 2CB, and 3CB, and sells the stored power of the storage battery when the storage rate reaches a predetermined value, for example, when the stored power amount becomes 95%. In this case, the storage battery power selling management unit 707 monitors the trading price of JEPX6 and sells the stored power of the storage battery when the trading price is high.

[0111] The power ledger management unit 708 creates and stores ledger data on the amount of green power determined in the power transmission and reception plan transmitted from the PV-ESS1 and the amount of received power at the corresponding consumer 2 as blocks on a daily basis, for example, using blockchain technology. In this case, the regional power management and control device 7 passes the data on the power transmission amount and the received power amount to the PV-ESS1 and the consumer 2 in order to create a ledger using blockchain technology, obtains approval for the power transmission amount of the PV-ESS1 and the required power amount of the consumer 2, and causes the PV-ESS1 and the consumer 2 to manage the ledger on green power in a distributed manner.

[0112] As described above, according to the power network system of this embodiment, it is possible to realize a local microgrid that can consume local green power without waste locally.

[0113] [Modification Example of the Above Embodiment] In the above-described embodiment, the local power management and control device 7 remotely controls the PV-ESS1, SG-ESS3, and the consumer 2 through the communication network. However, from the local power management and control device 7, a planned power transmission amount is sent to the PV-ESS1 and SG-ESS3, and a planned power reception amount is sent to the consumer 2. The PV-ESS1 and SG-ESS3 that have received the planned power transmission amount, and the consumer 2 that has received the planned power reception amount may be configured to autonomously control the received planned power transmission amount and planned power reception amount.

[0114] That is, based on the received planned power transmission amount, when the PV-ESS1 has an excess power generation amount compared to the planned power transmission amount, the PV-ESS1 controls to store the excess amount in the battery 1CB. When the power generation amount is insufficient, the PV-ESS1 controls to send out the insufficient amount from the battery 1CB. Also, in the consumer 2, based on the received planned power reception amount, when the actual power consumption amount is less than the planned power reception amount, the excess amount is stored in the battery 2CB. When the actual power consumption amount becomes more than the planned power reception amount, the consumer 2 controls to cover the difference in power with the stored power of the battery 2CB.

[0115] In the local area, there may be a power shortage state where the power demand exceeds the supply power and the power is insufficient. In the power network system of this embodiment, the local power management and control device 7 can control the stored power of the battery 1CB of the PV-ESS1, the battery 3B of the SG-ESS3, and the battery 2CB of the consumer 2 to cope with such a power shortage state.

[0116] That is, in that case, the regional power management and control device 7 is provided with a power shortage state detection means. This power shortage state detection means monitors the power saving requests from power companies or grid operation companies to consumers, monitors that the power purchase requests have increased in the time - ahead market in JEPX6, or is based on information from corporate groups related to power such as power wide - area operation promotion institutions, and detects the power shortage state. Then, when the power shortage state detection means in the regional power management and control device 7 detects a power shortage state, it refers to the SOC of each of the battery 1CB of PV - ESS1, the battery 3B of SG - ESS3, and the battery 2CB of the consumer 2, detects the power of the battery that can be made into surplus, and sells the detected power of the battery. And when a power selling contract is established, the regional power management and control device 7 controls to discharge the power from the battery in which the detected surplus power is stored and send it to the power grid 4.

[0117] Note that the green power generation plants provided in the regional range AR may include those without a storage battery. In that case, the generated power may be directly transmitted to the grid, or may be configured to store the generated power in SG - ESS3. Also, the surplus power generated by the green power generation plant may also be configured to be stored in SG - ESS3. Also, the battery 1CB of PV - ESS1 may be configured to store power from the power grid 4.

[0118] Also, the regional power management and control device 7 is provided with a disaster occurrence detection function for detecting the occurrence of a regional disaster, detecting an emergency earthquake notification, a warning, or an alert of the occurrence of a disaster. When the occurrence of the disaster, the emergency earthquake notification, the warning, or the alert is detected, the regional power management and control device 7 may be configured to control, for example, the battery 2CB of the regional consumer 2 to be fully charged in consideration of the state where a power outage is likely to occur due to the disaster.

[0119] Furthermore, when a disaster is detected by the disaster occurrence detection function, the consumer 2 and the power grid 4 may be disconnected under the control from the regional power management and control device 7, and in the consumer 2, the stored power of the storage battery 2CB may be configured to be available for home use. Also, considering that the communication network 5 may become unavailable during a disaster, a disaster occurrence detection function may be provided on the consumer 2 side, and when a disaster is detected, the consumer 2 side itself may be configured to disconnect the connection with the power grid 4.

[0120] In addition, in the above-described embodiment, a plurality of power generation plants are provided in the region, but it is also possible to have a single power generation plant and integrate it with the regional power management and control device 7. Also, it is possible to integrate one of the plurality of power generation plants with the regional power management and control device 7.

[0121] In addition, in the above-described embodiment, the ledger management of green power is performed on a daily basis, but it is not limited to daily basis, and it may be, for example, on a shorter basis such as half-day basis (night and day), or on a longer basis such as multiple days basis or one-week basis.

Explanation of Reference Numerals

[0122] 1... Photovoltaic power generation plant (PV-ESS), 2... Consumer, 3... System storage device (SG-ESS), 4... Power grid, 5... Communication network, 6... Japan Electric Power Exchange (JEPX), 7... Regional power management and control device, 8... Japan Meteorological Agency

Claims

1. A power network system for realizing a regional microgrid that consumes regional green power in the region, comprising: one or more green power generation plants with batteries provided in the region; one or more power consumers in the region equipped with batteries; a power grid for transmitting and receiving power between the green power generation plant and the power consumers; a regional power management and control device connected to each of the green power generation plant and the power consumers through a communication network; and having: The regional power management and control device: Demand power prediction means for predicting the demand power of the consumers in the region; Power generation prediction means for predicting the power generation of the green power generation plants in the region; Based on the predicted demand power predicted by the demand power prediction means and the predicted power generation predicted by the power generation prediction means, a power transmission and reception plan for the region is created, which determines the planned power transmission amount transmitted from each of the green power generation plants and the planned power reception amount received by each of the consumers; Control means for controlling each of the green power generation plants to perform power transmission according to the planned power transmission amount and controlling each of the consumers to perform power reception according to the planned power reception amount; A power network system characterized by comprising the above.

2. When the actual power generation of the green power generation plant is less than the planned power transmission amount, power is transmitted from the battery of the green power generation plant. When the actual power reception amount at the consumer is less than the planned power reception amount, the excess received power is stored in the battery of the consumer. The power network system according to claim 1, characterized by the above.

3. Power storage power can be transferred between a plurality of batteries including the battery of the green power generation plant and the battery of the consumer. The power network system according to claim 1, characterized by the above.

4. The regional power management and control device: Obtains and monitors the State of Charge (SOC) of the battery of the green power generation plant and the SOC of the battery of the consumer through the communication network. The power network system according to claim 1, characterized by the above.

5. The demand-side user is provided with a solar power generation device, and at least a part of the power consumption at the demand-side user is covered while charging the storage battery with the generated power from the solar power generation device. The power network system according to claim 1 or claim 4, characterized in that.

6. The regional power management and control device acquires and monitors the SOC of the storage battery of the demand-side user through the communication network, and acquires and monitors information on the trading price of power in the wholesale power exchange where power trading is conducted. When the trading price of the power is low (at the lowest value), power is purchased from the green power generation plant according to the power transmission and reception plan, and the planned received power amount determined for each of the demand-side users is distributed. The power network system according to claim 1, characterized in that.

7. The regional power management and control device acquires and monitors the SOC of the storage battery of the demand-side user through the communication network, and acquires and monitors information on the trading price of power in the wholesale power exchange where power trading is conducted. When the trading price of the power is low (at the lowest value), it controls to purchase power at the wholesale power exchange and store it in the storage battery of the demand-side user. The power network system according to claim 1, characterized in that.

8. The regional power management and control device acquires and monitors the SOC of the storage battery of the demand-side user through the communication network, and acquires and monitors information on the trading price of power in the wholesale power exchange where power trading is conducted. When the SOC of the storage battery exceeds a predetermined value and the trading price of the power is high, it controls to sell the power of the storage battery and send out the amount of power sold from the storage battery. The power network system according to claim 1, characterized in that.

9. One or more system storage devices are provided in the region. The regional power management and control device acquires and monitors the SOC of the system storage device through the communication network, and acquires and monitors information on the trading price of power in the wholesale power exchange where power trading is conducted. When the trading price of the power is low (at the lowest value), it controls to purchase power at the wholesale power exchange and store it in the system storage device, and the power stored in the system storage device is also used as the planned power transmission amount. The power network system according to claim 1, characterized in that.

10. The regional power management and control device when the SOC of the system energy storage device exceeds a predetermined value and the trading price of the electric power is high, controls to sell electric power at the Japan Bulk Electric Power Exchange and send out the amount of electric power sold from the system energy storage device The power network system according to claim 7, characterized by the above.

11. The regional power management and control device manages, for each predetermined period, information on the history of power transmission and reception of the green power together with information capable of proving the environmental value of the green power, in blocks based on blockchain technology. The power network system according to claim 1, characterized by the above.

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