JP7749518B2 - Power Transmission System - Google Patents

Description

The present invention relates to a power transmission system.

Patent Document 1 states that in recent years, in light of environmental goals such as CO2 reduction, there has been growing interest in buildings equipped with power generation equipment that uses solar power generation and the like. In such buildings, when there is surplus electricity generated by the power generation equipment, the electricity is actively sold, thereby making efficient use of electricity.

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 entered into the HEMS, electricity is actively sold to the power company when the residents are away, and power-using equipment within the building is shut down, thereby ensuring efficient use of electricity.

JP 2013-20488 A

However, surplus generated electricity is generally sold to electric power companies that supply grid power, but in the event of a large-scale grid power outage during a disaster or other event, it can be difficult to effectively utilize this surplus electricity.

The present invention takes the above into consideration and aims to provide a power transmission system that can effectively utilize surplus generated power even during a power outage in the grid.

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 generated power between buildings, and a power transmission control device that controls the transmission of generated power between buildings. The power transmission control device calculates the amount of surplus and shortage of power for each building based on the amount of power generated, used, and stored power. When a power outage in the grid power coverage area of the power transmission and distribution network is detected, power is transmitted via the power transmission and distribution network from buildings with surplus power to buildings with a power shortage, according to the preset priority of the buildings.

In the power transmission system according to the first aspect, each building is equipped with a power generation device that generates electricity using natural energy. Furthermore, the generated power can be transmitted between buildings via the 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, it transmits power via the power transmission and distribution network from buildings with surplus power to buildings with a power shortage, according to preset building priorities. This allows the generated power of each building to be shared as emergency power for 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 preset building priorities, wasteful power transmission is reduced, and surplus generated power can be effectively utilized even during a power outage in the grid power coverage area.

In the power transmission system according to the second aspect, in the configuration described in the first aspect, the power transmission control device is capable of receiving a power request from a communication terminal owned by a building manager, and determines that the building of the manager who sent the power request is a building experiencing a power shortage.

In the power transmission system according to the second aspect, when a power request is received from a communications terminal owned by a building manager, the manager's building is determined to be one experiencing a power shortage. This makes it possible to determine a power shortage in response to requests from building residents, etc., and to prevent excess power from being transmitted to unoccupied buildings with no power demand, thereby reducing wasted power transmission.

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

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 buildings with surplus power to provide surplus power while ensuring that they have enough power to use in the event of a long-term power outage due to a disaster or other event.

In a fourth aspect of the power transmission system, 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.

In the power transmission system according to the fourth aspect, a request for supply is sent to the manager of a building where surplus power has occurred, and power is supplied to other buildings only if the manager gives permission. This allows the manager to refuse the supply of power if, for example, an increase in power usage within the building is expected, allowing the manager to supply surplus power taking into account the usage situation within the building.

In the power transmission system of the fifth aspect, in the configuration described in the first aspect, the power transmission control device determines the power supply priorities for multiple buildings that are short of power based on multiple preset priority evaluation items, and transmits surplus power provided to the multiple buildings based on the determined priorities.

In the power transmission system according to the fifth aspect, the priority of power supply is determined based on multiple preset priority evaluation items. This allows power to be supplied to buildings in order of priority when there are multiple buildings with power shortages.

The power transmission system according to the sixth aspect is the same as the configuration described in the first aspect, but includes a storage battery provided for each building that can store the power generated by the power generation device, and a relay battery provided separately from the storage battery in the power transmission and distribution network. The power transmission control device stores the provided surplus power in the relay battery and supplies power to buildings that are short of power via the relay battery.

In the power transmission system according to the sixth aspect, the provided surplus power is stored in a relay battery and supplied via the relay battery to buildings that are short of power. This makes it possible to estimate the total amount of surplus power in multiple buildings based on the amount of power stored in the relay battery, making it easier to manage surplus power.

The seventh aspect of the power transmission system is the same as the third aspect, except that the storage battery is a storage battery mounted on an electric vehicle.

The power transmission system according to the seventh aspect can determine whether or not there is surplus power by taking into account the power stored in the storage batteries installed in the electric vehicles, making it possible to efficiently use power generated using natural energy not only for power within buildings but also for power used by the electric vehicles.

As described above, the power transmission system of the present invention has the excellent effect of making effective use of surplus generated power even during a power outage in the grid.

1 is a schematic diagram illustrating an overall configuration of a power transmission system according to an embodiment. 1 is a schematic diagram illustrating a building and an electric power grid according to an embodiment. FIG. 1 is a block diagram showing a hardware configuration of a power transmission control device according to an embodiment. 1 is a block diagram showing a functional configuration of a power transmission control device according to an embodiment; 10 is a table showing an example of priority evaluation items. 10 is a table showing an example of a priority evaluation of buildings. FIG. 2 is a block diagram showing a hardware configuration of the HEMS device according to the embodiment. FIG. 2 is a block diagram showing a functional configuration of the HEMS device according to the embodiment. FIG. 10 is a sequence diagram illustrating an example of a flow of a power transmission process according to the embodiment.

The power transmission system S according to this embodiment will be described below with reference to Figures 1 to 9.

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 building H. The power transmission control device 10 and the HEMS device 12 are connected via a network N. Note that HEMS devices 12 installed in multiple buildings H are connected to the network N, but for ease of explanation, only two buildings H and two HEMS devices 12 are shown in FIG. 1.

(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.

(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.

(Power generation device 16)
The 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. The power generation device 16 is a power source whose generated power fluctuates over time depending on the season, sunlight conditions, etc. The power generation device 16 is connected to a conversion device 18, and the generated power of the power generation device 16 is supplied to the conversion device 18.

(Storage battery 60)
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.

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 with a larger 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.

(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 the conversion device 18, and can supply AC power to the conversion device 18.

(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.

The electric vehicle V can 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 engine output and electric motor output.

(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.

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.

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.

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."

(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 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 grid 90 connected to the distribution board 80 via the conversion device 18.

The HEMS device 12 can also charge the storage battery 60 and the storage battery 120 with 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.

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.

(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.

The CPU 20 is a central processing unit that executes various programs and controls each component. That is, the CPU 20 reads programs from the ROM 22 or storage 26 and executes the programs using the RAM 24 as a working area. The CPU 20 controls the above components and performs various calculations in accordance with the programs stored in the ROM 22 or storage 26.

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

The communication I/F 28 is an interface that allows 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).

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 specific instructions to the power transmission control device 10 and is configured to include, for example, a mouse and keyboard. The display device 36 is a device such as a display for displaying information output from the power transmission control device 10.

(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.

As shown in FIG. 4, the power transmission control device 10 is functionally configured to include 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. Each functional configuration is realized by the CPU 20 reading and executing a program stored in the ROM 22 or storage 26.

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

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

The power monitoring unit 210 monitors the amount of surplus and shortage power 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.

The power monitoring unit 210 also monitors the supply status of grid power to the loads 100 in building H. This function of the power monitoring unit 210 makes it possible to detect the amount of grid power used in each building H and the occurrence of grid power outages.

The power outage detection unit 220 has the function of detecting power outages that occur within the coverage area of the power transmission and distribution network 14. Specifically, the power outage detection unit 220 detects power outages in the grid that occur in building H within the coverage area by monitoring the grid power supply status performed by the power monitoring unit 210.

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

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

However, this is not limited to the above. For example, the power monitoring unit 210 can also determine that building H, whose grid power usage immediately before a grid power outage was equal to or greater than a predetermined threshold, is a building with a power shortage.

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

Figure 5 shows an example of a score table that has been preset for multiple priority evaluation items. The priority determination unit 240, for example, calculates the scores of the priority evaluation items for each building H by referring to the score table shown as an example in Figure 5. Then, as shown in Figure 6, it calculates a score for each priority evaluation item and determines the priority order in order of the total score of each building H.

In one example of this embodiment, the priority evaluation items include "area evaluation," "building type," and "contract power."

The "district evaluation" is classified into a number of districts within the area covered by the power transmission and distribution network 14. A score is assigned to each district according to the land use assigned to that district. Examples of land uses include "commercial area,""residentialarea,""industrialarea," and "agricultural land." For example, by setting the score of a "commercial area" with a high population density higher than the score of an "agricultural land" with a low population density, the score of building H, which is located in a densely populated area with high demand for electricity, can be prioritized.

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 "commercial areas" with high population densities may be set higher than that for "residential areas," and if a power outage occurs at night, the score for "residential areas" may be set higher than that for "commercial areas."

"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 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."

In addition, the "home medical care facilities" may be scored 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 if there are residents requiring care, the score will be calculated from 0 to 100 depending on the type of home medical care provided.

"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 assigned. For example, a score between 0 and 100 is calculated depending on the size of the contracted power. This allows surplus power to be supplied preferentially to buildings H with a large number of household members.

The power transmission control unit 250 transmits power from a building H with surplus power to another building H with a power shortage via the power transmission and distribution network 14. In one example of this embodiment, the power transmission control unit 250 transmits power only when permission to provide power is obtained from the manager of the building H with surplus power.

Specifically, the power transmission control unit 250 notifies a communication terminal owned by the manager of 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 building H is used as the "communication terminal," but this is not limited to this, and the "communication terminal" may also be a communication terminal such as a smartphone or tablet owned by the manager.

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

(Hardware configuration of the HEMS device 12)
Fig. 7 is a block diagram showing the hardware configuration of the HEMS apparatus 12. As shown in Fig. 7, the HEMS apparatus 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.

The CPU 40 is a central processing unit that executes various programs and controls each component. That is, the CPU 40 reads programs from the ROM 42 or storage 46 and executes the programs using the RAM 44 as a working area. The CPU 40 controls the above components and performs various calculations in accordance with the programs stored in the ROM 42 or storage 46.

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

The communication I/F 48 is an interface that allows the HEMS device 12 to communicate 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 the input device 54 and the display device 56. The input device 54 is a device operated by residents of the building H to input specific 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.

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

As shown in FIG. 8, the HEMS device 12 is configured to include, as functional components, a data communication unit 410, a power transmission switching unit 420, and a power reception switching unit 430. Note that each functional component is realized by the CPU 40 reading and executing a program stored in the ROM 42 or storage 46.

The data communication unit 410 transmits information to the power transmission control device 10 regarding the amount of power generated, used, and stored in building H, as well as the status of grid power supply to building H. 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 this amount 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 this amount 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 grid power supplied to building H, and transmits this amount to the power transmission control device 10.

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 by a predetermined input operation performed by the manager of building H or the like on the HEMS device 12B. Alternatively, the power request may be transmitted automatically from the HEMS device 12B if the amount of grid power usage immediately before a power outage occurs in building H is equal to or greater than a predetermined threshold.

The power transmission switching unit 420 receives a power transmission command sent 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 also be supplied directly from the conversion device 18 to the relay battery 70 without going through the storage battery 60.

The power receiving switching unit 430 receives a power receiving command sent 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.

(effect)
Next, the operation of this embodiment will be described.

(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. Note that 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. Also, 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.

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

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 regarding the amount of power generated, used, and stored power of each building H, and the supply status of grid power, is transmitted.

In step S106, the power transmission control device 10 detects the occurrence of a power outage within the area covered by the power transmission and distribution network 14 based on the function of the power monitoring unit 210.

In step S108, a power request is transmitted from the HEMS device 12B of the building with a power shortage, and the power transmission control device 10 accepts the power request using the function of the power request acceptance unit 230.

In step S110, the power transmission control device 10 uses the power request reception unit 230 to determine whether there is a power request from building H within the coverage area. If it determines that there is a power request, it proceeds to step S112. On the other hand, if it determines that there is no power request, it determines that there are no buildings with a power shortage and terminates the power transmission process.

In step S112, the power transmission control device 10 determines, based on the function of the power monitoring unit 210, whether there is a building H with stored power equal to or greater than a predetermined threshold. If it is determined that there is a building H with stored power 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 with stored power equal to or greater than the predetermined threshold, it determines that there is no building H with surplus power and terminates the power transmission process.

In step S114, the power transmission control device 10 performs a priority determination process. Specifically, the power transmission control device 10 uses the function of the priority determination unit 240 to calculate scores for multiple preset priority evaluation items, and determines the priorities of power supply for multiple 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.

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

In step S118, a response notification is sent from the HEMS device 12A to the power transmission control device 10. Note that this response notification may allow the administrator to set the start and end times for which power provision is permitted.

In step S120, the power transmission control device 10, using the function of the power transmission control unit 250, references the response notification and determines whether the administrator has authorized the provision of surplus power. If it determines that the provision of power has been authorized, the process proceeds to step S122, where a power transmission command is sent to the HEMS device 12A. As a result, the surplus power of building H is supplied to and stored in the relay battery 70 under the control of the HEMS device 12A.

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 storage battery 60 or storage battery 120 (S126), and processing returns to step S102.

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 storage battery 120 of building H under the control of the HEMS device 12B.

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 electricity using natural energy. Furthermore, the generated electricity can be transmitted between buildings via the power transmission and distribution network 14. When the power transmission control device 10, which controls the transmission of electricity, detects a power outage in the grid power coverage area of the power transmission and distribution network 14, it transmits electricity via the power transmission and distribution network 14 from buildings H with surplus electricity to buildings H with a power shortage, according to preset building priorities. This allows the generated electricity of each building H to be shared as emergency power for a specified area in the event of a grid power outage, such as during a disaster. Furthermore, because electricity is transmitted according to preset building priorities, wasteful power transmission is reduced, and surplus generated electricity can be effectively utilized even during a grid power outage.

When the power transmission system S receives a power request from a HEMS device 12 (communications terminal) owned by the manager of 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 building H's residents, etc., and to prevent surplus power from being transmitted to unoccupied buildings H with no power demand, thereby reducing wasted power transmission.

The power transmission system S notifies the manager of the building H where surplus power is generated of a request for provision, and provides power to other buildings H only if the manager gives permission. This allows the manager to refuse the provision of power if it is expected that the amount of power used within the building will increase, allowing the manager to supply surplus power taking into account the usage situation within the building H.

The power transmission system S determines the priority of power supply based on multiple preset priority evaluation items. This allows power to be supplied to buildings with higher priority in the event that there are multiple buildings H with power shortages.

In the power transmission system S, the provided surplus power is stored in the relay battery 70 and supplied via the relay battery 70 to buildings that are short of power. 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 surplus power.

The power transmission system S can determine whether or not there is surplus power by taking into account the stored power in the storage battery 120 installed in the electric vehicle V, so that power generated using natural energy can be efficiently used not only for power within the building H but also for power used by the electric vehicle V.

[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 the present invention is not limited to this. A wind power generation system or a geothermal power generation system may also be used.

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

Furthermore, the processing performed by CPU 20 after reading the program in the above embodiment may be performed by various processors other than CPU 20. Examples of processors in this case include dedicated electrical circuits, such as programmable logic devices (PLDs) (such as field-programmable gate arrays (FPGAs)) whose circuit configuration can be changed after manufacture, and application-specific integrated circuits (ASICs) that 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.

Furthermore, in the above embodiment, various data is stored in storage 26 and storage 46, but this is not limited to this. For example, non-transitory recording media such as CDs (Compact Disks), DVDs (Digital Versatile Disks), and USB (Universal Serial Bus) memory may also be used as storage units. In this case, various programs, data, etc. will be stored on these recording media.

10 Power transmission control device 12 HEMS device (communication terminal)
14 Power transmission and distribution network 16 Power generation device 60 Storage battery 70 Relay battery 90 System power 120 Storage battery H Building S Power transmission system V Electric vehicle

Claims (8)

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. 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 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. 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. a storage battery provided for each building and capable of storing the power 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. The power transmission control device of claim 4 notifies a communication terminal held by an administrator of a building having surplus power of a request for the provision of power, and if the administrator 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 administrator does not approve the provision of power, stores the surplus power in the storage battery. 3. The power transmission system according to claim 1, wherein the power transmission control device determines the priority of power supply for a plurality of buildings that are short of power based on a plurality of preset priority evaluation items, and transmits surplus power provided based on the determined priority to the plurality of buildings. a storage battery provided for each building and 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. The power transmission system according to claim 4 , wherein the storage battery is a storage battery mounted on an electric vehicle.