JP2017046485A - Power supply system for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system for a building that is able to sufficiently obtain economical effect by virtue of use of storage power.SOLUTION: A building 10 is provided with a housing battery 21 that stores, as storage power, commercial power supplied from a commercial power source and power generated by a solar panel 15 and that is able to supply an electric load L in the building 10. When power is supplied to the electric load L by the housing battery 21, power supply control is exerted by a controller 45 such that an amount of power stored in the battery 21 does not decrease below a predetermined lower limit set value. In a position adjacent to the building 10, a charging device 27 that, with a vehicle 30 connected thereto, is able to supply each electric load L with the storage power of a battery 31 mounted in the vehicle 30. When the vehicle 30 is not connected to the charging device 27, the controller 45 sets the lower limit set value to a first set value, and when the vehicle is connected to the charging device 27, the controller sets the lower limit set value to a second set value smaller than the first set value.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power supply system for a building.

  A storage battery (stationary storage battery) may be installed in a building such as a house (see Patent Document 1, for example). The storage battery is charged with, for example, low-cost commercial power (midnight power) in the midnight time zone, and is charged with the generated power of the solar panel in the daytime time zone. Electric power (stock electric power) stored in the storage battery is supplied to various electric loads (home appliances, lighting fixtures, etc.) in the building, and each electric load is operated by the supplied electric power. In this case, each electric load is operated using relatively inexpensive stored power.

JP 2014-68433 A

  By the way, in the event of an emergency such as a power failure, it is assumed that the storage battery is used as an emergency power source and various electric loads in the building are operated by the stored power of the storage battery. Therefore, it is desirable to always ensure a certain amount of electric power (amount of stored electricity) in the storage battery in preparation for such emergency use.

  However, if a certain amount of electricity is stored in the storage battery, the certain amount cannot be used when power is supplied from the storage battery to the electric load. Therefore, there is a possibility that the economic effect due to the use of the stored power cannot be sufficiently obtained.

  This invention is made | formed in view of the said situation, and makes it the main objective to provide the electric power feeding system of a building which can fully acquire the economic effect by use of stored electric power.

  In order to solve the above problems, a power supply system for a building according to a first aspect of the present invention stores at least one of commercial power supplied from a commercial power source and generated power generated by a solar panel as stored power and stores the stored power. The building storage battery capable of supplying power to the electrical load in the building and the power supply to the electrical load by the building storage battery are controlled so that the storage amount of the building storage battery does not fall below a predetermined lower limit setting value. A power supply system for a building comprising a power supply control means, capable of connecting a vehicle equipped with an in-vehicle storage battery, and capable of supplying stored electric power of the in-vehicle storage battery to the electric load in a state where the vehicle is connected Means for determining whether or not the vehicle is connected to the power supply means, and the vehicle is connected to the power supply means by the connection determination means. If it is determined that there is not, the first set value is set as the lower limit set value, and if it is determined that the vehicle is connected to the power supply means, the lower limit set value is determined from the first set value. And setting means for setting a second setting value that is smaller than the first setting value.

  In a configuration in which power supply means is provided adjacent to (or in the building), when a vehicle is connected to the power supply means, electric power (accumulated power) from a vehicle storage battery (vehicle storage battery) to an electrical load in the building. Electric power) can be supplied. Therefore, in this case, since an in-vehicle storage battery can be used for power supply to an electrical load in the event of an emergency such as a power failure, the minimum amount of electricity stored in the building storage battery should be reduced accordingly. Is possible.

  Therefore, in the present invention, paying attention to this point, the lower limit setting value of the storage amount in the building storage battery is set based on whether or not the vehicle is connected to the power supply means. Specifically, when the vehicle is connected to the power supply means, the lower limit set value is set smaller than when the vehicle is not connected. Thereby, when the vehicle is connected to the power supply means, it is possible to use a large amount of the stored power of the building storage battery, so that it is possible to sufficiently obtain an economic effect by using the stored power.

  Examples of the stored power stored in the building storage battery include inexpensive commercial power (midnight power) supplied from a commercial power source at midnight (night time), and power generated by a solar panel.

  In the building power supply system according to a second aspect of the present invention, in the first invention, the power supply means charges the vehicle storage battery with power supplied from at least one of the commercial power supply and the building storage battery. It has a function.

  In the present invention, the power supply means with a charging function capable of charging the vehicle is applied to the first invention. In this case, it is possible to obtain an advantage that the lower limit set value of the amount of power stored in the building storage battery can be reduced by charging the vehicle storage battery using such a charging function.

  According to a third aspect of the present invention, there is provided a building power supply system according to the first or second aspect of the present invention, further comprising an acquisition unit configured to acquire a storage amount of the in-vehicle storage battery. The second set value is set based on the amount of power stored in the in-vehicle storage battery acquired by the acquisition means when it is determined that the connection is established.

  According to the present invention, the second set value (lower limit set value) of the building storage battery is set according to the storage amount of the in-vehicle storage battery. In this case, when the amount of power stored in the in-vehicle storage battery is large, it is possible to use more of the stored power of the storage battery by setting the second setting value (lower limit setting value) of the building storage battery to a smaller value accordingly. Become. Thereby, it becomes possible to obtain more economic effects by using the stored power.

  In the building power supply system according to a fourth aspect of the present invention, in any one of the first to third aspects, when the second set value is set as the lower limit set value, the storage amount of the building storage battery is It is characterized by comprising a notification control means for executing a predetermined notification process when it falls below the first set value.

  When the second set value is set as the lower limit set value of the building storage battery (in other words, when the vehicle is connected to the power supply means), the storage amount of the building storage battery falls below the first set value. However, if the vehicle is disconnected from the power supply means during the power supply, the amount of electricity stored in the building storage battery is the lower limit set value (first set value). This will cause a situation in which emergency power is not secured. Therefore, in view of this point, in the present invention, when the second set value is set as the lower limit set value, a predetermined notification process is executed when the storage amount of the building storage battery falls below the first set value. It is said. In this case, when the user cancels the connection of the vehicle, it is possible to take measures such as charging and then releasing until the amount of power stored in the building storage battery is equal to or higher than the first set value. It is possible to avoid a situation where power for time is not secured.

  In a building power supply system according to a fifth aspect of the present invention, in any one of the first to fourth aspects, the connection determination unit determines that the vehicle is not connected to the power supply unit, and the storage battery of the building When the amount falls below the first set value, the replenishment means for charging the building storage battery until the amount of stored electricity becomes equal to or higher than the first set value is provided.

  As described above, when the vehicle is connected to the power supply means, power can be supplied from the storage battery to the electric load even if the storage amount of the building storage battery falls below the first set value. When the vehicle is disconnected from the power supply means, the amount of electricity stored in the building storage battery is below the lower limit set value (first set value). Therefore, in the present invention, when such a situation occurs, the storage battery is charged by the replenishing means until the amount of power stored in the building storage battery becomes equal to or higher than the first set value. As a result, even if the amount of electricity stored in the building storage battery falls below the lower limit set value (first set value) due to vehicle disconnection, the building storage battery is subsequently charged to secure the amount of electricity stored. It is possible to avoid leaving the power without being secured.

The whole block diagram which shows the outline of an electric power feeding system. The figure which shows the electric constitution of an electric power feeding system. The flowchart which shows a battery control process. The flowchart which shows a battery charge process. The flowchart which shows a battery electric power feeding process.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram showing an outline of a power feeding system in the present embodiment.

  As shown in FIG. 1, a distribution board 11 is provided in the building 10. The distribution board 11 is supplied with commercial power of AC100V / 200V from the commercial power supply (system power supply) (not shown) via the power transmission line 12.

  The roof 13 of the building 10 is provided with a solar panel 15 that generates power by being irradiated with sunlight. The electric power generated by the solar panel 15 is supplied to the distribution board 11 via the power line 16. Specifically, the DC power generated by the solar panel 15 is converted into AC power by a power converter (DC / AC) 15a (see FIG. 2) and then supplied to the distribution board 11.

  Another power line 17 is connected in the middle of the power line 16, and the power line 17 is connected to the power storage device 20. The power storage device 20 includes a residential battery 21 and is installed adjacent to the building 10 outdoors. The electric power generated by the solar panel 15 is supplied to the power storage device 20 through the power lines 16 and 17, and the residential battery 21 is charged by the supplied electric power. The power storage device 20 may be installed in the building 10.

  Further, commercial power is supplied to the power storage device 20 from the distribution board 11 via the power line 18. Therefore, the residential battery 21 is charged by such commercial power. In particular, in the present embodiment, the residential battery 21 is charged with power in the midnight time zone (hereinafter referred to as midnight power) in which the power unit price is set lower than the daytime time zone. The residential battery 21 corresponds to a building storage battery.

  The electric power (accumulated electric power) stored in the electric storage device 20 (residential battery 21) is supplied to the distribution board 11 through the electric power line 19. Therefore, the distribution board 11 is supplied with commercial power from a commercial power supply, power generated by the solar panel 15, and stored power of the residential battery 21. And these electric power supplied to the distribution board 11 is supplied to the various electric loads L (Lighting equipment, an air-conditioning apparatus, household appliances, etc.) in the building 10 via the branch power line 23. FIG.

  Outside the building, a parking space 25 is provided adjacent to the building 10 where the automobile 30 can be parked. The vehicle 30 is a plug-in hybrid vehicle (PHV), which includes an engine as a power source, a motor generator (both not shown), and the like, and an in-vehicle battery 31 formed of a high-voltage secondary battery. In addition, the automobile 30 is provided with a connection port 32 (inlet) to which an external power supply device can be connected in order to take in electric power to the in-vehicle battery 31 from the outside. This connection port 32 is connected to the in-vehicle battery 31. The in-vehicle battery 31 corresponds to an in-vehicle storage battery.

  A charging device 27 that charges the automobile 30 parked in the space 25 is provided in the vicinity of the parking space 25. The charging device 27 includes a charging cable 28, and a connection plug 28 a is provided at the tip of the charging cable 28. The connection plug 28 a is inserted into the connection port 32 of the automobile 30, so that the automobile 30 (specifically, the in-vehicle battery 31) and the charging device 27 are electrically connected via the charging cable 28. In addition, the charging device 27 is provided with a connection detection sensor 29 that detects that the vehicle 30 is connected to the device 27 via the charging cable 28.

  The charging device 27 is connected to the distribution board 11 via the power line 34. As a result, commercial power, power generated by the solar panel 15, and the like are supplied from the distribution board 11 to the charging device 27 via the power line 34. When the above power is supplied to the charging device 27 in a state where the charging device 27 is connected to the vehicle 30 via the charging cable 28, the power is supplied from the charging device 27 to the vehicle 30 via the charging cable 28. Supplied. And the vehicle-mounted battery 31 is charged with the supplied electric power.

  The charging device 27 has a function of charging the automobile 30 (on-vehicle battery 31), and takes out the electric power (accumulated electric power) stored in the on-vehicle battery 31 and supplies it to the electric load L in the building 10. It has a power supply function (discharge function) to supply (discharge). The charging device 27 is connected to the distribution board 11 via the power line 35. When the charging device 27 is connected to the automobile 30 via the charging cable 28, the stored power of the in-vehicle battery 31 is transferred to the charging cable 28. It is possible to take in the charging device 27 via the power supply and supply the taken-in power to the distribution board 11 via the power line 35 from the same device 27. As a result, in the event of an emergency such as a power failure, the on-board battery 31 can be used as an emergency power source, so that the stored power of the on-board battery 31 can be supplied from the distribution board 11 to each electric load L in the building 10. It has become. The charging device 27 corresponds to a power feeding unit.

  The automobile 30 is provided with an ECU (electronic control unit) 33 that manages the storage state of the in-vehicle battery 31. The ECU 33 includes a communication unit 33a (see FIG. 2) that performs wireless communication with an external device. The ECU 33 calculates the charged amount of the in-vehicle battery 31 and transmits the calculated charged amount information from the communication unit 33a in response to a request from an external device.

  Next, the electrical configuration of the power supply system will be described with reference to FIG. FIG. 2 is a diagram illustrating an electrical configuration of the power feeding system.

  As shown in FIG. 2, the power transmission line 12 is provided with a shutoff device 36 at a connection portion with the distribution board 11. The shut-off device 36 permits or blocks the supply of power (commercial power) from the commercial power source to the distribution board 11.

  The power storage device 20 is provided with a plurality of shut-off devices 37 to 39. The interruption device 37 is provided on the power line 17, and the interruption device 37 permits or blocks the supply of electric power (generated power) from the solar panel 15 to the residential battery 21 through the electric power line 17 (and the electric power line 16). Moreover, the interruption | blocking apparatus 38 is provided in the electric power line 18, and supply of the electric power (commercial electric power) from the distribution board 11 to the residential battery 21 through the electric power line 18 is permitted or interrupted | blocked by the interruption | blocking apparatus 38. The interruption device 39 is provided on the power line 19, and the interruption device 39 permits or blocks the supply of electric power (accumulated electric power) from the residential battery 21 to the distribution board 11 through the electric power line 19.

  The power line 17 is provided with a power conversion unit (AC / DC) 41 that converts AC power supplied from the solar panel 15 (specifically, the power conversion unit 15a) into DC power. A power converter (AC / DC) 42 that converts AC power supplied from the power board 11 into DC power is provided, and the power line 19 is power that converts DC power supplied from the residential battery 21 into AC power. A conversion unit (DC / AC) 43 is provided.

  The power storage device 20 is provided with a controller 45. The controller 45 includes a known microcomputer having a CPU and the like. The controller 45 includes a communication unit 45 a capable of wireless communication with the ECU 33 of the automobile 30. When the connection detection sensor 29 detects that the automobile 30 is connected to the charging device 27, the controller 45 transmits a request signal to the ECU 33 of the automobile 30 from the communication unit 45a. When the ECU 33 receives the request signal, the ECU 33 transmits the storage amount information of the in-vehicle battery 31 to the controller 45. And the controller 45 acquires the electrical storage amount of the vehicle-mounted battery 31 by receiving the electrical storage amount information transmitted from ECU33 through the communication part 45a.

  The residential battery 21 is provided with a storage amount sensor 46 that detects the storage amount of the battery 21. The detection results are sequentially input from the charged amount sensor 46 to the controller 45.

  In addition, the power storage device 20 is provided with a notification unit 47 that notifies a storage state or the like in the residential battery 21. The notification unit 47 is configured by an audio output device such as a speaker. The notification unit 47 performs notification by outputting sound based on a command from the controller 45. Note that the notification unit 47 is not necessarily configured by an audio output device. For example, the notification unit 47 may be configured by a display display and the notification content may be displayed on the display. Further, the notification unit 47 may be provided in the building 10.

  The charging device 27 is provided with a switching device 48. The switching device 48 switches which of the power lines 34 and 35 is connected to the charging cable 28. If the power line 34 and the charging cable 28 are connected by the operation of the switching device 48 in a state where the automobile 30 is connected to the charging device 27 via the charging cable 28, the power line 34 and the charging cable 28 (and further charging) Electric power is supplied from the distribution board 11 to the automobile 30 via the device 27). In this case, the vehicle-mounted battery 31 is charged with the electric power.

  On the other hand, when the power line 35 and the charging cable 28 are connected by the switching operation of the switching device 48, the stored power of the in-vehicle battery 31 is transferred to the distribution board 11 via the charging cable 28 and the power line 35 (and the charging device 27). To be supplied. In this case, the stored power is supplied from the distribution board 11 to each electric load L.

  As described above, in the present charging device 27, either the charging process for the automobile 30 (the in-vehicle battery 31) or the feeding process from the in-vehicle battery 31 to the building 10 (electric load L) is performed by operating the switching device 48. Can be switched to implement. The switching device 48 is connected to the operation unit 49 of the charging device 27, and is switched based on the operation of the operation unit 49.

  Of the power lines 34 and 35 connected to the switching device 48, the power line 34 is provided with a power conversion unit (AC / DC) 51 that converts AC power supplied from the distribution board 11 into DC power. The power line 35 is provided with a power conversion unit (DC / AC) 52 that converts DC power supplied to the distribution board 11 into AC power.

  As described above, the storage amount information of the residential battery 21 is input from the storage amount sensor 46 and the storage amount information of the in-vehicle battery 31 is input from the ECU 33 of the automobile 30 to the controller 45 of the storage device 20. In addition, the connection detection result is input from the connection detection sensor 29 to the controller 45.

  The controller 45 performs battery charging processing for charging the residential battery 21 based on the storage information and the like of the input batteries 21 and 31, and the stored power of the residential battery 21 to the electric load L in the building 10. A battery power supply process to be supplied is executed. In the present embodiment, the controller 45 performs the battery charging process in the midnight time zone and performs the battery power supply process in the other time zone (that is, the daytime time zone). That is, in the present embodiment, the residential battery 21 is charged using relatively inexpensive commercial power (midnight power) in the midnight time zone, and the stored power stored in the battery 21 in the daytime time zone is stored. Suppose that it supplies to each electric load L in the building 10. FIG. In the daytime, among the stored power of the residential battery 21 and the commercial power from the commercial power source, the stored power of the residential battery 21 is given priority and supplied to the electrical load L in the building 10. Yes.

  The controller 45 performs the battery charging process by opening and closing the shut-off device 38 based on the storage amount information of the residential battery 21. Further, the controller 45 performs battery power supply processing by opening and closing the shut-off device 39 based on the storage amount information of the residential battery 21, the storage amount information of the in-vehicle battery 31, and the detection result from the connection detection sensor 29. .

  In the battery power supply process, the controller 45 controls power supply to the electric load L by the battery 21 so that the amount of electricity stored in the residential battery 21 does not fall below a predetermined lower limit set value. Here, the lower limit set value is set to a power storage amount that needs to be secured at least when the residential battery 21 is used as an emergency power source in an emergency such as a power failure. Therefore, at the time of battery power supply processing, a certain amount of stored electricity is always secured in the residential battery 21. For this reason, in this power supply system, when an emergency such as a power failure occurs, each electric load L in the building 10 can be operated using the stored power of the residential battery 21.

  The controller 45 opens and closes the shut-off device 36 based on whether or not the storage amount of the residential battery 21 has decreased to a predetermined lower limit set value during the battery power supply process. That is, whether or not the commercial power from the commercial power source is supplied to each electric load L in the building 10 is controlled by opening and closing the shut-off device 36.

  Next, a battery control process executed by the controller 45 of the power storage device 20 will be described. FIG. 3 is a flowchart showing the battery control process. This process is repeatedly executed at a predetermined cycle.

  As shown in FIG. 3, first, in step S11, it is determined whether or not the present time is a midnight time zone. If the current time is in the midnight time zone, the process proceeds to step S12 to execute the battery charging process. On the other hand, if the current time is not a midnight time zone, that is, if it is a daytime time zone, the process proceeds to step S13 to execute a battery power supply process. After the process of step S12 or step S13 is completed, this process is terminated.

  Next, the battery charging process in step S12 and the battery power supply process in step S13 will be described. First, the battery charging process will be described with reference to FIG. FIG. 4 is a flowchart showing the battery charging process.

  As shown in FIG. 4, first, in step S <b> 21, it is determined whether the residential battery 21 is fully charged based on the storage amount information from the storage amount sensor 46. When the residential battery 21 is not fully charged, the process proceeds to step S22, and the residential battery 21 is charged. In this case, by closing the shut-off device 38, commercial power (midnight power) is supplied from the distribution board 11 to the residential battery 21. As a result, the residential battery 21 is charged by cheap midnight power. In the midnight time zone, the shut-off device 36 is normally closed, and commercial power (midnight power) is always supplied from the commercial power source to the distribution board 11. Thereafter, this process is terminated.

  On the other hand, when the residential battery 21 is fully charged, the process proceeds to step S23, and the charging of the residential battery 21 is stopped. In this case, the power supply from the distribution board 11 to the residential battery 21 is shut off by opening the shut-off device 38. Thereafter, this process is terminated.

  Next, the battery power supply process will be described with reference to FIG. FIG. 5 is a flowchart showing battery power supply processing.

  As shown in FIG. 5, first, in step S <b> 31, the storage amount of the residential battery 21 is acquired based on the detection result from the storage amount sensor 46.

  In subsequent step S <b> 32, based on the detection result from the connection detection sensor 29, it is determined whether or not the automobile 30 is connected to the charging device 27 via the charging cable 28. If the automobile 30 is not connected to the charging device 27, the process proceeds to step S33.

  In step S33, the first set value is set as the lower limit set value. Here, when the residential battery 21 is used as an emergency power source, and more specifically, when only the residential battery 21 is used as an emergency power source, the first set value needs to be secured to the battery 21 as a minimum. Is set to a certain amount of electricity stored. The first set value is stored in advance in the storage unit of the controller 45, and the first set value is read from the storage unit and set.

  In step S34, it is determined whether the amount of electricity stored in the residential battery 21 is equal to or less than the first set value. When the amount of electricity stored in the residential battery 21 is larger than the first set value, the process proceeds to step S35, and the stored power in the residential battery 21 is supplied to each electric load L in the building 10 via the distribution board 11. . In this case, by closing the shut-off device 39, power supply from the residential battery 21 to the distribution board 11 is permitted (implemented).

  In the subsequent step S36, the supply of the commercial power from the commercial power supply to each electric load L is stopped. In this case, the power supply from the commercial power source to the distribution board 11 is shut off by opening the shut-off device 36. Thereafter, this process is terminated.

  In the previous step S34, when the amount of electricity stored in the residential battery 21 is equal to or less than the first set value, the process proceeds to step S37, and power supply to each electric load L is stopped for the stored power of the residential battery 21. In this case, the power supply from the residential battery 21 to the distribution board 11 is shut off by opening the shut-off device 39.

  In the subsequent step S38, commercial power supplied from a commercial power source is supplied to each electric load L via the distribution board 11. In this case, power supply from the commercial power source to the distribution board 11 is permitted by closing the shut-off device 36.

  In step S39, it is determined whether or not the amount of electricity stored in the residential battery 21 is smaller than the first set value. If the amount of electricity stored in the residential battery 21 is the same as the first set value, this process ends. On the other hand, when the amount of electricity stored in the residential battery 21 is smaller than the first set value, the process proceeds to step S40.

  In step S40, a replenishment process is executed. In the replenishment process, the battery 21 is charged until the amount of electricity stored in the residential battery 21 reaches the first set value. In this case, the power supply from the distribution board 11 to the residential battery 21 is permitted (implemented) by closing the shut-off device 38. Thereafter, this process is terminated.

  When it is determined in step S32 described above that the automobile 30 is connected to the charging device 27, the process proceeds to step S41, and a request signal is transmitted from the communication unit 45a to the ECU 33 of the automobile 30. In this case, when this request signal is received by the ECU 33, the ECU 33 transmits the storage amount information of the in-vehicle battery 31 to the controller 45.

  In continuing step S42, the electrical storage amount of the vehicle-mounted battery 31 is acquired by receiving the electrical storage amount information transmitted from ECU33 by the communication part 45a.

  In step S43, the second set value is set as the lower limit set value. Here, the second set value is a value obtained by subtracting the charged amount of the in-vehicle battery 31 from the first set value (second set value = first set value−the charged amount of the in-vehicle battery 31). The value is smaller than the set value. In this step, the first set value is read from the storage unit of the controller 45, the difference between the read first set value and the charged amount of the in-vehicle battery 31 is calculated, and the calculated difference is set as the second set value. To do.

  In step S44, it is determined whether or not the amount of electricity stored in the residential battery 21 is smaller than the first set value. If the amount of electricity stored in the residential battery 21 is greater than or equal to the first set value, the process proceeds to step S49, and the stored power in the residential battery 21 is supplied to each electric load L in the building 10. In this case, by closing the shut-off device 39, power supply from the residential battery 21 to the distribution board 11 is permitted (implemented).

  In subsequent step S50, the supply of the commercial power from the commercial power supply to each electric load L is stopped. In this case, the power supply from the commercial power source to the distribution board 11 is shut off by opening the shut-off device 36. Thereafter, this process is terminated.

  In step S44, when the amount of electricity stored in the residential battery 21 is smaller than the first set value, the process proceeds to step S45, and a notification process is executed. In the notification process, by outputting a notification signal to the notification unit 47, the notification unit 47 notifies the user that the amount of power stored in the residential battery 21 has fallen below the first set value. In this case, for example, the notification is performed by outputting a buzzer sound from the notification unit 47. As a result, when the user releases the connection of the automobile 30 to the charging device 27, it is possible to take a countermeasure such as charging after the charge amount of the residential battery 21 is equal to or higher than the first set value and then releasing it. It becomes possible.

  Note that the user can charge the battery 21 for home use by operating an operation unit provided in the power storage device 20, for example. In this case, based on the operation of the operation unit, the shut-off device 38 is closed, and power is supplied from the distribution board 11 to the residential battery 21.

  In continuing step S46, it is determined whether the electrical storage amount of the residential battery 21 is below a 2nd setting value. When the amount of electricity stored in the residential battery 21 is larger than the second set value, the stored power in the residential battery 21 is supplied to each electric load L in the building 10 (step S49), and the commercial power from the commercial power source is supplied. Is stopped from being supplied to each electric load L (step S50). Thereafter, this process is terminated.

  On the other hand, when the amount of electricity stored in the residential battery 21 is equal to or less than the second set value, the process proceeds to step S47, and the supply of the stored power of the residential battery 21 to each electric load L is stopped. In this case, the power supply from the residential battery 21 to the distribution board 11 is shut off by opening the shut-off device 39.

  In the subsequent step S48, commercial power from a commercial power source is supplied to each electric load L. In this case, power supply from the commercial power source to the distribution board 11 is permitted by closing the shut-off device 36. Thereafter, this process is terminated.

  When the battery power supply process is performed, the shut-off device 37 is normally closed so that the power generated by the solar panel 15 is always supplied to the residential battery 21. Therefore, when the battery power supply process is performed, the residential battery 21 is always charged by the power generated by the solar panel 15 (except when it cannot generate power, such as in rainy weather).

  As mentioned above, according to the structure of this embodiment explained in full detail, the following outstanding effects are acquired.

  By the way, in the electric power feeding system of the said embodiment, when the motor vehicle 30 is connected to the charging device 27, it becomes possible to supply the electrical storage electric power stored in the vehicle-mounted battery 31 to the electric load L in the building 10. FIG. Yes. Therefore, in such a configuration, if the automobile 30 is connected to the charging device 27, the in-vehicle battery 31 can also be used for power supply to the electric load L in the event of an emergency such as a power failure. Therefore, it is possible to reduce the minimum amount of power storage to be secured.

  Therefore, in the above embodiment, paying attention to this point, it is determined whether or not the automobile 30 is connected to the charging device 27, and based on the determination result, the lower limit setting value of the storage amount in the residential battery 21. It was set. Specifically, when the automobile 30 is not connected to the charging device 27, the first set value is set as the lower limit setting value. When the automobile 30 is connected to the charging device 27, the lower limit setting value is set. As a result, a second set value smaller than the first set value was set. Thereby, when the automobile 30 is connected to the charging device 27, it is possible to use a large amount of the stored power of the residential battery 21, so that it is possible to sufficiently obtain an economic effect due to the use of the stored power. Become.

  Since the charging device 27 capable of charging the automobile 30 is used as a feeding means for feeding the electric load L from the automobile 30 (onboard battery 31), the onboard battery 31 is charged, so that the residential battery 21 can be charged accordingly. It is possible to obtain an advantage that the lower limit set value of the amount of stored electricity can be reduced.

  When the automobile 30 is connected to the charging device 27, the storage amount of the in-vehicle battery 31 is acquired, and the second set value as the lower limit setting value is set based on the acquired storage amount of the in-vehicle battery 31. In this case, when the amount of power stored in the in-vehicle battery 31 is large, it is possible to use more of the stored power of the storage battery by setting the lower limit set value of the residential battery 21 small accordingly. Thereby, it becomes possible to obtain more economic effects by using the stored power.

  When the second set value is set as the lower limit set value, the notification process by the notification unit 47 is performed when the stored amount of the residential battery 21 falls below the first set value. In this case, when the user cancels the connection of the automobile 30 to the charging device 27, it is possible to take measures such as charging before the stored amount of the residential battery 21 is equal to or higher than the first set value and then canceling. Therefore, it is possible to avoid a situation in which the amount of power stored in the residential battery 21 falls below the first set value (lower limit set value) when the automobile 30 is disconnected. As a result, it is possible to avoid a situation where emergency power is not secured.

  When it is determined that the automobile 30 is not connected to the charging device 27 and the stored amount of the residential battery 21 is lower than the first set value, the residential battery 21 is stored until the stored amount reaches the first set value. To charge. In this case, even if the storage amount of the residential battery 21 falls below the lower limit set value (first set value) due to the disconnection of the automobile 30, the residential battery 21 is charged thereafter to secure the stored amount. It can be avoided that emergency power is not secured.

  The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

  In the above embodiment, when the automobile 30 is connected to the charging device 27, the second set value (lower limit set value) is set based on the amount of electricity stored in the in-vehicle battery 31, but the electricity storage in the in-vehicle battery 31 is not necessarily performed. There is no need to set the second set value based on the amount. For example, when the automobile 30 is connected to the charging device 27, a predetermined fixed value may be set as the second setting value. However, also in this case, the second set value is set as a value smaller than the first set value.

  In the above embodiment, in the replenishment process (step S40), the battery 21 is charged so that the stored amount of the residential battery 21 becomes the first set value, but the stored amount of the residential battery 21 is the first. The battery 21 may be charged so as to be larger than the set value.

  In the above embodiment, when the second set value is set as the lower limit set value, the notification process (step S45) is performed when the stored amount of the residential battery 21 falls below the first set value. The notification process may not be performed.

  In the above embodiment, the charging device 27 capable of charging the automobile 30 is used as the power supply means, but it is not always necessary to use a power supply means having a charging function. That is, as a power supply means, a power supply unit having only a power supply function for supplying the stored power of the automobile 30 (vehicle battery 31) to the building 10 side may be used.

  In the above embodiment, the residential battery 21 is charged using both the late-night power and the generated power of the solar panel 15, but the residential battery 21 is charged using only one of these powers. You may go.

  In the above embodiment, the shut-off device 36 is provided in the connection portion of the power transmission line 12 with the distribution board 11, and the shut-off devices 37 to 39 are provided in the power storage device 20, but these shut-off devices 36 to 39 are collectively included. You may make it provide in one apparatus (inside a housing | casing). In this case, these shut-off devices 36 to 39 may be provided in the power storage device 20 or may be provided in a device different from the power storage device 20.

  In the above embodiment, a hybrid vehicle is used as the vehicle 30 (vehicle) that supplies power to the building 10 side, but an electric vehicle (EV) may be used. Further, the vehicle that supplies power to the building 10 side is not limited to a passenger car, and may be a truck, a motorcycle, or the like.

  DESCRIPTION OF SYMBOLS 10 ... Building, 11 ... Distribution board, 15 ... Solar panel as solar panel, 21 ... Residential battery as building storage battery, 27 ... Charging device as power supply means, 29 ... Connection detection sensor, 30 ... As vehicle , 31 ... an in-vehicle battery as an in-vehicle storage battery, 45 ... a controller as a connection determination means, a power feeding control means and a notification control means, L ... an electric load

Claims (5)

A storage battery for buildings capable of storing at least one of commercial power supplied from a commercial power source and generated power generated by a solar panel as stored power, and supplying the stored power to an electrical load in the building;
A building power supply system comprising: a power supply control unit configured to control power supply to the electrical load by the building storage battery so that a storage amount of the building storage battery does not decrease below a predetermined lower limit setting value,
A power supply means capable of connecting a vehicle equipped with an in-vehicle storage battery, and capable of supplying stored electric power of the in-vehicle storage battery to the electric load in a state where the vehicle is connected,
Connection determination means for determining whether or not the vehicle is connected to the power supply means;
When the connection determination means determines that the vehicle is not connected to the power supply means, a first set value is set as the lower limit set value, and it is determined that the vehicle is connected to the power supply means. And a setting means for setting a second set value smaller than the first set value as the lower limit set value.   2. The building power supply according to claim 1, wherein the power supply unit has a vehicle charging function for charging the in-vehicle storage battery with electric power supplied from at least one of the commercial power supply and the building storage battery. system. An acquisition means for acquiring the amount of electricity stored in the in-vehicle storage battery,
When the connection determination unit determines that the vehicle is connected to the power supply unit, the setting unit determines the second set value based on a storage amount of the in-vehicle storage battery acquired by the acquisition unit. The building power feeding system according to claim 1, wherein the building power supply system is set.   In the case where the second set value is set as the lower limit set value, it is provided with a notification control means for executing a predetermined notification process when the amount of power stored in the building storage battery falls below the first set value. The building power supply system according to any one of claims 1 to 3.   When it is determined by the connection determination means that the vehicle is not connected to the power supply means, and the amount of electricity stored in the building storage battery falls below the first set value, the amount of electricity stored is greater than or equal to the first set value. 5. The building power supply system according to claim 1, further comprising a supplementary unit that charges the building storage battery until

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