Power Transmission System

Abstract

To obtain a power transmission system that can effectively utilize surplus generated power even during a grid power outage.SOLUTION: In a power transmission system S, each building H is equipped with a power generation device 16 that generates electricity using natural energy, and generated power can be transmitted between buildings H via a power transmission and distribution network 14. When a power transmission control device 10 that controls power transmission detects a grid power outage within the corresponding area of the power transmission and distribution network 14, power is transmitted from the building H having a surplus amount of power to the building H having a shortage of power via the power transmission and distribution network 14 according to the preset priority of the building H.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a power transmission system. [Background technology]

[0002] Patent Document 1 states that in recent years, in light of environmental targets such as CO2 reduction, there has been growing interest in buildings equipped with power generation equipment using solar power generation, etc. In such buildings, when there is surplus electricity generated by the power generation equipment, the electricity is actively sold to ensure efficient use of electricity.

[0003] For example, Patent Document 1 discloses a building equipped with a power generation system that uses natural energy. In this building, based on the residents' schedules input into the HEMS, the building actively sells electricity to the power company while the residents are away, and shuts down power-using devices in the building, thereby achieving efficient use of electricity. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-20488

[0005] Generally, surplus generated electricity is sold to electric power companies that supply grid power. However, in the event of a large-scale grid power outage during a disaster or other such event, it is difficult to effectively utilize this surplus electricity. Summary of the Invention [Problem to be solved by the invention]

[0006] In consideration of the above, an object of the present invention is to provide a power transmission system that can effectively utilize surplus generated power even during a power outage in the grid. [Means for solving the problem]

[0007] The power transmission system according to the first aspect comprises a power generation device provided for each building that generates power using natural energy, a power transmission and distribution network that enables the transmission of the generated power between buildings, and a power transmission control device that controls the transmission of the generated power between buildings. The power transmission control device calculates the amount of surplus power and the amount of power shortage for each building based on the amount of power generated, the amount of power used, and the amount of power stored. When a power outage in the grid power is detected within the area covered by the power transmission and distribution network, power is transmitted from a building with surplus power to a building with a power shortage via the power transmission and distribution network, according to a predetermined priority of the buildings.

[0008] In a power transmission system according to a first aspect, each building is provided with a power generation device that generates power using natural energy. The generated power can be transmitted between buildings via a power transmission and distribution network. When a power transmission control device that controls the power transmission detects a power outage in the grid power coverage area of ​​the power transmission and distribution network, the power transmission control device transmits power via the power transmission and distribution network from buildings with surplus power to buildings with a power shortage, according to a preset building priority. This allows the generated power of each building to be shared as emergency power in a specified area in the event of a power outage in the grid power, such as during a disaster. Furthermore, because power transmission is performed according to a preset building priority, wasteful power transmission is reduced, and surplus generated power can be effectively utilized even during a power outage in the grid power coverage area.

[0009] In the power transmission system of the second aspect, in the configuration described in the first aspect, the power transmission control device is capable of accepting a power request from a communication terminal held by a building manager, and determines that the building of the manager who sent the power request is a building that is short of power.

[0010] In the power transmission system according to the second aspect, when a power request is received from a communication terminal owned by a building manager, the manager's building is determined to be a building with a power shortage. This makes it possible to determine the power shortage in response to the request of the building's residents, etc., and to prevent surplus power from being transmitted to unoccupied buildings with no power demand, thereby reducing wasteful power transmission.

[0011] The power transmission system according to the third aspect has a configuration as described in the first or second aspect, and includes a storage battery provided for each building that can store the electricity generated by the power generation device, and the power transmission control device determines that a building with surplus electricity is one in which the amount of stored electricity in the storage battery is equal to or greater than a predetermined threshold during a power outage.

[0012] In the power transmission system according to the third aspect, a building with stored power equal to or greater than a predetermined threshold is determined to have surplus power. This allows the building with surplus power to provide the surplus power while ensuring that it has enough power to be used in the event of a long-term power outage due to a disaster or other reason.

[0013] In the power transmission system of the fourth aspect, in the configuration described in the third aspect, the power transmission control device notifies a communication terminal held by the manager of a building with surplus power of a request for the provision of power, and if the manager approves the provision of power in response to the notification, transmits power from the building to a building with a power shortage, and if the manager does not approve the provision of power, stores the surplus power in the storage battery.

[0014] In the power transmission system according to the fourth aspect, a request for supply is notified to the manager of a building where surplus power is generated, and power is supplied to other buildings only if the manager gives permission. This allows the manager to refuse the supply of power if an increase in power usage within the building is expected, and allows the manager to supply surplus power taking into consideration the usage situation within the building.

[0015] In a power transmission system according to a fifth aspect, in the configuration described in the first aspect, the power transmission control device determines the priority of power supply for multiple buildings that are short of power based on multiple pre-set priority evaluation items, and transmits surplus power provided based on the determined priority to the multiple buildings.

[0016] In the power transmission system according to the fifth aspect, the priority of power supply is determined based on a plurality of preset priority evaluation items. As a result, when there are multiple buildings that are short of power, power can be supplied to the buildings in order of priority.

[0017] The power transmission system of the sixth aspect has the configuration described in the first aspect, and includes a storage battery provided for each building and capable of storing the electricity generated by the power generation device, and a relay battery provided in the power transmission and distribution network separately from the storage battery, and the power transmission control device stores the provided surplus electricity in the relay battery and supplies electricity to buildings that are short of electricity via the relay battery.

[0018] In the power transmission system according to the sixth aspect, the provided surplus power is stored in a relay battery and supplied to a building that is short of power via the relay battery. This allows the total amount of surplus power in multiple buildings to be estimated from the amount of power stored in the relay battery, making it easier to manage the surplus power.

[0019] A seventh aspect of the present invention provides a power transmission system according to the third aspect, wherein the storage battery is a storage battery mounted on an electric vehicle.

[0020] In the power transmission system according to the seventh aspect, the presence or absence of surplus power can be determined by taking into account the stored power in the storage battery installed in the electric vehicle, and therefore, it is possible to efficiently use the power generated using natural energy not only for the power within the building but also for the power used by the electric vehicle. [Effects of the Invention]

[0021] As described above, the power transmission system according to the present invention has the excellent effect of being able to effectively utilize surplus generated power even during a power outage in the grid. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a schematic diagram illustrating an overall configuration of a power transmission system according to an embodiment. [Figure 2] 1 is a schematic diagram illustrating a building and an electric power grid according to an embodiment. FIG. [Figure 3] 1 is a block diagram showing a hardware configuration of a power transmission control device according to an embodiment. [Figure 4] 1 is a block diagram showing a functional configuration of a power transmission control device according to an embodiment; [Figure 5] 10 is a table showing an example of priority evaluation items. [Figure 6] 10 is a table showing an example of a priority evaluation of buildings. [Figure 7] 1 is a block diagram showing a hardware configuration of an HEMS device according to an embodiment. [Figure 8] 1 is a block diagram showing a functional configuration of an HEMS device according to an embodiment. [Figure 9] FIG. 10 is a sequence diagram illustrating an example of a flow of a power transmission process according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, a power transmission system S according to this embodiment will be described with reference to FIGS.

[0024] As shown in Fig. 1, the power transmission system S of this embodiment is configured to include a power transmission control device 10 as a control device that controls the transmission of power between buildings, and a HEMS (Home Energy Management System) device 12 as a control device that controls the power usage of a building H. The power transmission control device 10 and the HEMS device 12 are connected to a network N. Note that the HEMS devices 12 installed in multiple buildings H are connected to the network N, but for the sake of convenience of explanation, only two buildings H and two HEMS devices 12 are shown in Fig. 1.

[0025] (Power transmission control device 10) The power transmission control device 10 monitors the amount of power generated, consumed, and stored power of multiple buildings H connected by a power transmission and distribution network 14. It also calculates the amount of surplus power and power shortage of each building H based on the amount of power generated, consumed, and stored power of the multiple buildings H, and transmits power from buildings H with surplus power to other buildings H with a power shortage via the power transmission and distribution network 14.

[0026] (Building H) 2, in this specification, the building H to which the power transmission system S is applied is described as a detached house, but the embodiment of the present invention is not limited to this. The power transmission system S can be applied to, for example, detached houses as well as apartment buildings, and can also be applied to non-residential facilities such as office buildings, commercial facilities, hospitals, and libraries.

[0027] (Generator 16) Building H is provided with a power generation device 16 that generates electricity using natural energy. In this embodiment, a solar power generation device equipped with solar cells that generate electricity by receiving sunlight will be described as an example. Power generation device 16 is a power source whose generated power fluctuates over time depending on the season, sunlight conditions, etc. Power generation device 16 is connected to conversion device 18, and the power generated by power generation device 16 is supplied to conversion device 18.

[0028] (60 batteries) The storage battery 60 is a stationary storage battery provided in the building H. The storage battery 60 includes a secondary battery such as a lithium ion battery. The storage battery 60 is connected to the conversion device 18 and is charged by the power supplied from the conversion device 18. The storage battery 60 can also supply power to the conversion device 18 by discharging.

[0029] The storage battery 60 is also connected to a power transmission and distribution network 14 that forms a closed power system connecting multiple buildings H. The power transmission and distribution network 14 has a relay battery 70 that has a larger power storage capacity than the storage battery 60. The storage battery 60 of a building H is electrically connected to the storage battery 60 of another building H via the relay battery 70. The storage battery 60 can also supply power to the relay battery 70 by discharging. In this embodiment, surplus power supplied from the storage battery 60 to the relay battery 70 is stored in the relay battery 70 and then supplied from the relay battery 70 to the storage battery 60 of another building H that is short of power.

[0030] (Distribution board 80) The distribution board 80 distributes AC power from the power system 90 to loads 100, which are electrical devices in the building H. The distribution board 80 is supplied with AC power from the power system 90. The loads 100 are connected to branch electric circuits connected to the distribution board 80. The branch electric circuits are supplied with AC power from the distribution board 80, and the loads 100 operate on the AC power supplied to the branch electric circuits. The distribution board 80 is also connected to a converter 18, and can supply AC power to the converter 18.

[0031] (Connector 110) The connector 110 is a connection terminal that is detachably connected to a charging connector of the electric vehicle V. The electric vehicle V has a built-in storage battery 120, and runs using electrical energy stored in the storage battery 120. The connector 110 is connected to a conversion device 18, and the storage battery 120 is charged by power supplied from the conversion device 18. The storage battery 120 can also supply power to the conversion device 18 by discharging.

[0032] The electric vehicle V may be an electric vehicle that runs on the output of an electric motor, or a plug-in hybrid vehicle that runs on a combination of the output of an engine and the output of an electric motor.

[0033] (Conversion Device 18) The operation of the conversion device 18 is controlled by the HEMS device 12. The HEMS device 12 is connected to the power generation device 16. The conversion device 18 can boost the DC voltage from the power generation device 16.

[0034] The conversion device 18 can convert the DC power output by the storage battery 60 into DC power of a predetermined magnitude. The conversion device 18 can also convert DC power into DC power of a predetermined magnitude and output the converted DC power to the storage battery 60.

[0035] The conversion device 18 can convert the DC power output by the storage battery 120 into DC power of a predetermined magnitude. The conversion device 18 can also convert DC power into DC power of a predetermined magnitude and output the converted DC power to the storage battery 120.

[0036] The conversion device 18 can convert DC voltage to AC voltage or AC voltage to DC voltage between the power grid 90 and the "power generation device 16, storage battery 60, and storage battery 120." As a result, the conversion device 18 has the function of converting DC power from the "power generation device 16, storage battery 60, and storage battery 120" into AC power and outputting it to the "load 100 and power grid 90," and the function of converting AC power from the power grid 90 into DC power and outputting it to the "storage battery 60 and storage battery 120."

[0037] (HEMS device 12) The HEMS device 12 is a control device that performs power management and control in the building H. The HEMS device 12 can charge the storage battery 60 or the storage battery 120 with the power generated by the power generation device 16 via the conversion device 18. Alternatively, the HEMS device 12 can supply the power generated by the power generation device 16 to the load 100 or the power system 90 connected to the distribution board 80 via the conversion device 18.

[0038] The HEMS device 12 can also charge the storage battery 60 and the storage battery 120 with the power supplied from the power grid 90 via the conversion device 18. Furthermore, the HEMS device 12 can control the order and amount of charging of the storage battery 60 and the storage battery 120.

[0039] The HEMS device 12 can also supply the power stored in the storage battery 60 to the load 100 connected to the distribution board 80 via the conversion device 18. The HEMS device 12 can also supply the power stored in the storage battery 120 to the load 100 connected to the distribution board 80 via the conversion device 18.

[0040] (Hardware configuration of power transmission control device 10) Fig. 3 is a block diagram showing the hardware configuration of the power transmission control device 10. As shown in Fig. 3, the power transmission control device 10 includes a CPU (Central Processing Unit: processor) 20, a ROM (Read Only Memory) 22, a RAM (Random Access Memory) 24, a storage 26, a communication I / F (communication interface) 28, and an input / output I / F (input / output interface) 30. Each component is connected to each other via a bus 32 so as to be able to communicate with each other.

[0041] The CPU 20 is a central processing unit that executes various programs and controls each part. That is, the CPU 20 reads programs from the ROM 22 or storage 26 and executes the programs using the RAM 24 as a work area. The CPU 20 controls each of the above components and performs various arithmetic processing in accordance with the programs recorded in the ROM 22 or storage 26.

[0042] The ROM 22 stores various programs and various data. The RAM 24 temporarily stores programs or data as a working area. The storage 26 is configured with an HDD (Hard Disk Drive) or an SSD (Solid State Drive) and stores various programs including an operating system and various data. In this embodiment, the ROM 22 or the storage 26 stores programs and various data for performing power transmission processing.

[0043] The communication I / F 28 is an interface for the power transmission control device 10 to communicate with other devices such as the HEMS device 12 in the building H and the electric vehicle V, and uses standards such as CAN (Controller Area Network), Ethernet (registered trademark), LTE (Long Term Evolution), FDDI (Fiber Distributed Data Interface), and Wi-Fi (registered trademark).

[0044] The input / output I / F 30 is electrically connected to an input device 34 and a display device 36. The input device 34 is a device for inputting predetermined instructions to the power transmission control device 10, and is configured to include, for example, a mouse and a keyboard. The display device 36 is a device such as a display for displaying information output from the power transmission control device 10.

[0045] (Functional configuration of power transmission control device 10) The power transmission control device 10 uses the above hardware resources to realize various functions. The functional configuration realized by the power transmission control device 10 will be described with reference to FIG.

[0046] 4, the power transmission control device 10 includes, as functional components, a power monitoring unit 210, a power failure detection unit 220, a power request reception unit 230, a priority determination unit 240, and a power transmission control unit 250. Each functional component is realized by the CPU 20 reading and executing a program stored in the ROM 22 or the storage 26.

[0047] The power monitoring unit 210 monitors the amount of power generated, used, and stored in the building H. The amount of power generated is the amount of power generated by the power generation device 16. The amount of power used is the amount of power used by the load 100 in the building H. The amount of stored power is the amount of power stored in the storage battery 60 and the storage battery 120.

[0048] In one example of this embodiment, the power monitoring unit 210 receives the amount of generated power, the amount of used power, and the amount of stored power transmitted from the HEMS device 12 of the building H based on a predetermined time period.

[0049] The power monitoring unit 210 monitors the amount of surplus power and the amount of power shortage for multiple buildings H connected by the power transmission and distribution network 14. Specifically, when the amount of generated power exceeds the amount of power used by the load 100 and the amount of stored power in the building H is equal to or greater than a predetermined threshold, the power monitoring unit 210 calculates the generated power minus the amount of power used as the surplus power.

[0050] Furthermore, the power monitoring unit 210 monitors the supply status of grid power to the loads 100 of the buildings H. The function of this power monitoring unit 210 makes it possible to detect the amount of grid power used in each building H and the occurrence of a power outage of the grid power.

[0051] The power outage detection unit 220 has a function of detecting a power outage that occurs within the coverage area of ​​the power transmission and distribution network 14. Specifically, the power outage detection unit 220 detects a power outage of the grid power that occurs in building H within the coverage area by monitoring the supply state of the grid power performed by the power monitoring unit 210.

[0052] The power request receiving unit 230 has a function of receiving power requests transmitted from the HEMS devices 12 of each building H. The power request receiving unit 230 may constantly receive power requests from all buildings H within a coverage area connected by the power transmission and distribution network 14, or may receive power requests only when a power outage occurs within the coverage area.

[0053] In this embodiment, the building H for which the power request receiving unit 230 has received a power request is determined to be a building with a power shortage.

[0054] However, without being limited to this, for example, the function of the power monitoring unit 210 can also determine that a building H whose grid power usage immediately before a power outage occurred was above a predetermined threshold is a building that is short of power.

[0055] When there are multiple buildings H with power shortages, the priority order determination unit 240 determines the priority order of power supply based on multiple preset priority evaluation items. Specifically, the priority order determination unit 240 calculates a score for each of the multiple preset priority evaluation items, and determines the priority order for each building H in the order of the calculated scores. Here, an example of the priority order evaluation items will be described with reference to FIG. 5.

[0056] Fig. 5 shows an example of a score table preset for a plurality of priority evaluation items. The priority order determination unit 240, for example, refers to the score table shown as an example in Fig. 5 to calculate the score of the priority evaluation item for each building H. Then, as shown in Fig. 6, a score is calculated for each priority evaluation item, and the priority order is determined in order of the total score of each building H.

[0057] In one example of this embodiment, the priority evaluation items include "area evaluation," "building type," and "contracted power."

[0058] The "area evaluation" is divided into multiple areas within the coverage area of ​​the power transmission and distribution network 14. Each area is land Scores are set according to the land use. Examples of land uses include "commercial land," "residential land," "industrial land," and "agricultural land." For example, by setting the score for "commercial land," which has a high population density, higher than the score for "agricultural land," which has a low population density, the score of building H, which is located in a densely populated area with high electricity demand, can be prioritized.

[0059] The scores for "commercial areas" and "residential areas" may also be changed taking into account the time of day when the power outage occurs. For example, if a power outage occurs during the day, the score for a "commercial area" with a high population density may be set higher than that for a "residential area," and if a power outage occurs at night, the score for a "residential area" may be set higher than that for a "commercial area."

[0060] "Building type" is classified into "evacuation facilities," "medical facilities," "commercial facilities," "homes with home medical facilities," and "general residences." These classifications are assigned scores in descending order of priority for restoring power supply in the event of a power outage. For example, "evacuation facilities," "medical facilities," and "homes with home medical facilities" that have home medical facilities are assigned higher scores than "general residences."

[0061] For "home medical care facilities," a score may be calculated according to the level of home medical care provided to the residents of building H. For example, a building with no residents requiring home medical care will have a score of 0, and a score ranging from 0 to 100 will be calculated depending on whether there are residents requiring care or the type of home medical care provided.

[0062] "Contracted power" is classified according to the size of the contracted power contracted with the power company that supplies grid power to each building H, and a corresponding score is set. For example, a score ranging from 0 to 100 is calculated according to the size of the contracted power. This allows surplus power to be supplied preferentially to buildings H with a large number of household members.

[0063] The power transmission control unit 250 transmits power from a building H having surplus power to another building H having a power shortage via the power transmission and distribution network 14. Here, in one example of this embodiment, the power transmission control unit 250 transmits power when permission to provide power is obtained from the manager of the building H having surplus power.

[0064] Specifically, the power transmission control unit 250 notifies a communication terminal owned by the manager of the building H of a request for the provision of power, and if the manager approves the provision of power in response to the notification, surplus power is transmitted from the manager's building H to another building H that is short of power. In this embodiment, an example will be described in which the HEMS device 12 of the building H is the "communication terminal," but this is not limiting and the communication terminal may be a smartphone, tablet, or other communication terminal owned by the manager.

[0065] When the power transmission control unit 250 receives a permission notification from the manager's communication terminal permitting the provision of power, the power transmission control unit 250 transmits and stores surplus power in the manager's building H to the relay battery 70 in the power transmission and distribution network 14. Thereafter, based on the priority determined by the function of the priority determination unit 240, the power stored in the relay battery 70 is transmitted to other buildings H.

[0066] (Hardware configuration of HEMS device 12) Fig. 7 is a block diagram showing the hardware configuration of the HEMS device 12. As shown in Fig. 7, the HEMS device 12 includes a CPU (Central Processing Unit: processor) 40, a ROM (Read Only Memory) 42, a RAM (Random Access Memory) 44, a storage 46, a communication I / F (communication interface) 48, and an input / output I / F (input / output interface) 50. Each component is connected to each other via a bus 52 so as to be able to communicate with each other.

[0067] The CPU 40 is a central processing unit that executes various programs and controls each part. That is, the CPU 40 reads programs from the ROM 42 or storage 46 and executes the programs using the RAM 44 as a work area. The CPU 40 controls each of the above components and performs various arithmetic processing in accordance with the programs recorded in the ROM 42 or storage 46.

[0068] The ROM 42 stores various programs and various data. The RAM 44 temporarily stores programs or data as a working area. The storage 46 is configured with an HDD (Hard Disk Drive) or an SSD (Solid State Drive) and stores various programs including an operating system and various data. In this embodiment, the ROM 42 or the storage 46 stores programs for performing various processes and various data.

[0069] The communication I / F 48 is an interface through which the HEMS device 12 communicates with other devices such as the power transmission control device 10, the storage battery 60, the electric vehicle V, and the load 100, and uses standards such as CAN, Ethernet (registered trademark), LTE, FDDI, and Wi-Fi (registered trademark). The input / output I / F 50 is electrically connected to an input device 54 and a display device 56. The input device 54 is a device operated by residents of the building H to input predetermined instructions to the HEMS device 12, and the display device 56 displays information output from the HEMS device 12. For example, the input device 54 and the display device 56 are configured as touch panel operation displays. The input / output I / F 50 is also electrically connected to the conversion device 18 and the connector 110.

[0070] (Functional configuration of HEMS device 12) The HEMS device 12 uses the above hardware resources to realize various functions. The functional configuration realized by the HEMS device 12 will be described with reference to FIG.

[0071] 8, the HEMS device 12 includes, as functional components, a data communication unit 410, a power transmission switching unit 420, and a power reception switching unit 430. Each functional component is realized by the CPU 40 reading and executing a program stored in the ROM 42 or the storage 46.

[0072] The data communication unit 410 transmits information regarding the amount of power generated, used, and stored in the building H, and the supply status of grid power to the building H, to the power transmission control device 10. Specifically, the data communication unit 410 communicates with the conversion device 18 via the communication I / F 48, calculates the amount of power generated by the power generation device 16, and transmits the amount of power generated to the power transmission control device 10. The data communication unit 410 also communicates with the load 100 via the communication I / F 48, calculates the amount of power used by the load 100, and transmits the amount of power used by the load 100 to the power transmission control device 10. The data communication unit 410 also communicates with the storage battery 60 and the electric vehicle V via the communication I / F 48, calculates the amount of power stored in the storage battery 60 and the storage battery 120, and transmits the amount of power stored in the storage battery 60 and the storage battery 120 to the power transmission control device 10. The data communication unit 410 also communicates with the distribution board 80 via the communication I / F 48, calculates the amount of power of grid power supplied to the building H, and transmits the amount of power to the power transmission control device 10.

[0073] The data communication unit 410 also has a function of transmitting a power request to the power transmission control device 10. This power request may be transmitted in response to a predetermined input operation performed by the manager of the building H or the like in the HEMS device 12B. Alternatively, the power request may be automatically transmitted from the HEMS device 12B when the amount of grid power usage immediately before a power outage occurs in the building H is equal to or greater than a predetermined threshold.

[0074] The power transmission switching unit 420 receives a power transmission command transmitted from the power transmission control device 10 and supplies the power stored in the storage battery 60 to the relay battery 70. Note that surplus power may be supplied directly from the conversion device 18 to the relay battery 70 without going through the storage battery 60.

[0075] The power reception switching unit 430 receives a power reception command transmitted from the power transmission control device 10, and receives power supplied from the relay battery 70. The received power is charged into the storage battery 60 or the storage battery 120.

[0076] (action) Next, the operation of this embodiment will be described.

[0077] (Power transmission processing) An example of the flow of power transmission processing will be described with reference to the sequence diagram shown in Fig. 9. The processing in the power transmission control device 10 is realized by the CPU 20 functioning as a power monitoring unit 210, a power outage detection unit 220, a power request reception unit 230, a priority determination unit 240, and a power transmission control unit 250. The processing in the HEMS device 12 is realized by the CPU 40 functioning as a data communication unit 410, a power transmission switching unit 420, and a power receiving switching unit 430.

[0078] In the sequence diagram of Figure 9, the HEMS device 12 installed in the building H that has surplus power is indicated by the symbol "12A," and the HEMS device 12 installed in the building H that has a power shortage is indicated by the symbol "12B."

[0079] In steps S102 and S104, power amount data is transmitted from the HEMS devices 12A and 12B of each building H to the power transmission control device 10. Specifically, data related to the amount of power generated, the amount of power used, the amount of power stored, and the supply status of grid power of each building H is transmitted.

[0080] In step S106, the power transmission control device 10 detects the occurrence of a power outage in the coverage area of ​​the power transmission and distribution network 14 based on the function of the power monitoring unit 210.

[0081] In step S108, a power request is transmitted from the HEMS device 12B of the building where power is insufficient, and the power transmission control device 10 receives the power request using the function of the power request receiving unit 230.

[0082] In step S110, the power transmission control device 10 determines whether or not there is a power request from a building H within the coverage area, using the function of the power request receiving unit 230. If it is determined that there is a power request, the process proceeds to step S112. On the other hand, if it is determined that there is no power request, it determines that there is no building with a power shortage, and ends the power transmission process.

[0083] In step S112, the power transmission control device 10 determines whether or not there is a building H whose stored power amount is equal to or greater than a predetermined threshold, based on the function of the power monitoring unit 210. If it is determined that there is a building H whose stored power amount is equal to or greater than the predetermined threshold, the process proceeds to step S114. On the other hand, if it is determined that there is no building H whose stored power amount is equal to or greater than the predetermined threshold, it is determined that there is no building H with surplus power, and the power transmission process is terminated.

[0084] In step S114, the power transmission control device 10 performs a priority order determination process. Specifically, the power transmission control device 10 calculates scores for a plurality of preset priority evaluation items using the function of the priority order determination unit 240, and determines the priorities of power supply for a plurality of buildings H based on the calculated scores. In this embodiment, a score table or a formula for score calculation is stored in advance in the storage 26 of the power transmission control device 10, and the score is calculated using this score table or formula.

[0085] In step S116, the power transmission control device 10 transmits a power provision request notification to the manager of the building H that is determined to have surplus power, using the function of the power transmission control unit 250. In this embodiment, the provision request notification is transmitted to the HEMS device 12A of the building H that has surplus power.

[0086] In step S118, a response notification is transmitted from the HEMS device 12A to the power transmission control device 10. Note that this response notification may enable the administrator to set the start time and end time for which the provision of power is permitted.

[0087] In step S120, the power transmission control device 10, by using the function of the power transmission control unit 250, refers to the response notification and determines whether or not the administrator has permitted the provision of surplus power. If it is determined that the provision of power is permitted, the process proceeds to step S122, where a power transmission command is transmitted to the HEMS device 12A. As a result, the surplus power of the building H is supplied to and stored in the relay battery 70 under the control of the HEMS device 12A.

[0088] On the other hand, if it is determined that the provision of power is not permitted, the surplus power of building H continues to be stored in the storage battery 60 or the storage battery 120 (S126), and the process returns to step S102.

[0089] In step S124, the power transmission control device 10 transmits a power reception command to the HEMS device 12B using the function of the power transmission control unit 250. As a result, surplus power is supplied to the storage battery 60 or the storage battery 120 of the building H under the control of the HEMS device 12B.

[0090] As described above, in the power transmission system S of this embodiment, each building H is provided with a power generation device 16 that generates power using natural energy. Furthermore, the generated power can be transmitted between buildings via the power transmission and distribution network 14. When the power transmission control device 10, which controls the power transmission, detects a power outage in the grid power coverage area of ​​the power transmission and distribution network 14, it transmits power from a building H with surplus power to a building H with a power shortage via the power transmission and distribution network 14, according to a preset building priority. This allows the power generated by each building H to be shared as emergency power in a specified area in the event of a power outage in the grid power, such as during a disaster. Furthermore, because power is transmitted according to a preset building priority, wasteful power transmission is reduced, and surplus generated power can be effectively utilized even during a power outage in the grid power coverage area.

[0091] When the power transmission system S receives a power request from the HEMS device 12 (communication terminal) owned by the manager of a building H, it determines that the manager's building H is a building with a power shortage. This makes it possible to determine the power shortage in response to the requests of residents of the building H, and to prevent excess power from being transmitted to unoccupied buildings H with no power demand, thereby reducing wasteful power transmission.

[0092] The power transmission system S notifies the administrator of the building H where surplus power has been generated of a request for provision, and provides power to other buildings H only if the administrator gives permission. This allows the administrator to refuse the provision of power if an increase in power usage within the building is expected, and the administrator can supply surplus power taking into consideration the usage situation within the building H.

[0093] In the power transmission system S, the priority of power supply is determined based on a plurality of preset priority evaluation items. As a result, when there are multiple buildings H that are short of power, power can be supplied in order from the building with the highest priority.

[0094] In the power transmission system S, the provided surplus power is stored in the relay battery 70 and supplied to buildings that are short of power via the relay battery 70. This makes it possible to estimate the total amount of surplus power in multiple buildings H from the amount of power stored in the relay battery 70, making it easier to manage the surplus power.

[0095] In the power transmission system S, the presence or absence of surplus power can be determined by taking into account the stored power of the storage battery 120 installed in the electric vehicle V, so that the power generated using natural energy can be efficiently used not only for the power within the building H but also for the power used by the electric vehicle V.

[0096] [supplementary explanation] The power transmission system S according to the embodiment has been described above, but it goes without saying that it can be embodied in various forms without departing from the spirit of the present invention. For example, in the above embodiment, a solar power generation system was described as an example of the power generation system 16 that utilizes natural energy, but this is not limiting. A wind power generation system or a geothermal power generation system may also be used.

[0097] 5 are merely examples, and the present invention is not limited to these. The priority of power supply may be determined based on some of the items shown in FIG. 5, or other items may be added to the items shown in FIG. 5.

[0098] Furthermore, the processing performed by the CPU 20 after reading the program in the above embodiment may be performed by various processors other than the CPU 20. Examples of such processors include programmable logic devices (PLDs) whose circuit configuration can be changed after fabrication, such as field-programmable gate arrays (FPGAs), and dedicated electrical circuits, such as application-specific integrated circuits (ASICs), which are processors with circuit configurations specifically designed to perform specific processing. The processing may be performed by one of these various processors, or by a combination of two or more processors of the same or different types, such as multiple FPGAs or a combination of a CPU and an FPGA. The hardware structure of these various processors is, more specifically, an electrical circuit that combines circuit elements such as semiconductor devices.

[0099] Furthermore, in the above embodiment, various data are stored in storage 26 and storage 46, but this is not limiting. For example, non-transitory recording media such as CDs (Compact Disks), DVDs (Digital Versatile Disks), and USB (Universal Serial Bus) memory may be used as storage units. In this case, various programs and data are stored in these recording media. [Explanation of symbols]

[0100] 10 Power transmission control device 12 HEMS device (communication terminal) 14 Power Transmission and Distribution Network 16 Power generating equipment 60 Storage battery 70 Relay Battery 90 Grid power 120 Battery H building S Power Transmission System V Electric Vehicle

Claims

1. A power generation device that uses natural energy and is installed in each building; A power transmission and distribution network that enables the transmission of generated electricity between buildings; a power transmission control device that controls the transmission of generated power between buildings, The power transmission control device calculates the amount of surplus power and the amount of power shortage for each building based on the amount of power generated, the amount of power used, and the amount of stored power, and when a power outage of the grid power is detected within the coverage area of ​​the power transmission and distribution network, transmits power from a building with surplus power to a building with a power shortage via the power transmission and distribution network in accordance with the priority of the building based on a score set higher for buildings in a first district than for buildings in a second district where the population density during the time period when the power outage was detected is lower than that of the first district. Power transmission system.

2. A power generation device installed in each building that generates electricity using natural energy; A power transmission and distribution network that enables the transmission of generated electricity between buildings; a power transmission control device that controls the transmission of generated power between buildings, The power transmission control device calculates the amount of surplus power and the amount of power shortage of each building based on the amount of power generated, the amount of power used, and the amount of stored power, and when a power outage of the grid power is detected within the coverage area of ​​the power transmission and distribution network, transmits power from a building with surplus power to a building with a power shortage via the power transmission and distribution network in accordance with the priority of the building based on a score set higher for buildings classified as evacuation facilities, medical facilities, or home medical care facilities than for buildings classified as general residences. Power transmission system.

3. The power transmission control device is capable of receiving a power request from a communication terminal owned by a building manager, The power transmission system according to claim 1 or 2, wherein the building of the manager who transmitted the power request is determined to be a building that is short of power.

4. A storage battery is provided for each building and is capable of storing the electricity generated by the power generation device, The power transmission system according to claim 1 or 2, wherein the power transmission control device determines that a building having an amount of stored power in the storage battery equal to or greater than a predetermined threshold during a power outage is a building having surplus power.

5. The power transmission control device notifies a communication terminal held by the manager of a building having surplus power of a request for the provision of power, and if the manager approves the provision of power in response to the notification, transmits power from the building to a building that is short of power, and if the manager does not approve the provision of power, stores the surplus power in the storage battery, in the power transmission system described in claim 4.

6. The power transmission system described in claim 1 or claim 2, wherein the power transmission control device determines the priority of power supply for multiple buildings that are short of power based on multiple pre-set priority evaluation items, and transmits surplus power provided based on the determined priorities to the multiple buildings.

7. A storage battery provided for each building, capable of storing the electricity generated by the power generation device; a relay battery provided in the power transmission and distribution network separately from the storage battery, 3. The power transmission system according to claim 1, wherein the power transmission control device stores the provided surplus power in the relay battery and supplies the power to a building that is short of power via the relay battery.

8. A power transmission system as described in claim 4, wherein the storage battery is a storage battery mounted on an electric vehicle.

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