JP2016025830A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system with consideration given to suppression of running cost by calculating a power generation amount of an external power supply apparatus including photovoltaic power generation and a power consumption amount at a building.SOLUTION: A HEMS 30 calculates a power amount usable at a building 10 from a power generation amount of an external power generation apparatus 28 including a photovoltaic power generation apparatus calculated based on weather information acquired from a weather information server 72, determines power load means 26 usable at the building 10 on the basis of the calculated power amount usable at the building 10 and displays the power amount and the power load means usable at the building 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system that controls power supplied to a building such as a house.

  It is recommended from the standpoint of energy conservation to charge the storage battery with the surplus of power supplied to the building from an external power generation device such as a solar power generation device, and use the power of the charged storage battery in the building as necessary. Yes. In addition, power charged in a storage battery is supplied to a building at the time of a power failure.

  In Patent Document 1, when the supply of commercial power is stopped at the time of a power failure and power is supplied from an external power supply to the power load means in the building, the power usage status by the power load means is monitored for each system that can be supplied at the time of power supply. In addition, a power supply system is disclosed in which power supply is controlled for each system, thereby preventing an excessive power demand with respect to the power supply capability of the external power supply device and preventing power supply from the external power supply device from being suddenly stopped.

JP 2007-236023 A

  However, although the technology described in Patent Document 1 can prevent power supply by the external power supply device from being stopped suddenly, the limit value of the amount of power that can be supplied by the external power supply device at the time of a power failure, and when the power failure continues, The user cannot know how much power load means can be used.

  The present invention has been made in consideration of the above facts, and the user can use which power load means with respect to the power supply to the power load means in the building by the external power supply device including the external power generation device and the storage battery. An object is to provide a power supply system that can be known.

  The invention of claim 1 for solving the above-described problem is a storage battery that stores power to be supplied to a building, an external power generation device that supplies the generated power to the building and the storage battery, and a storage amount of the storage battery. A storage amount detecting means for performing, a power generation amount calculating means for calculating a power generation amount of the external power generator, a setting means for setting a power supply mode to the building to a first mode or a second mode, and the power storage amount Calculating the amount of power that can be used in the building in the power supply mode set by the setting means from the amount of electricity detected by the detection means and the power generation amount of the external power generation device calculated by the power generation amount calculation means; Control means for determining power load means that can be used in the building based on the calculated power amount that can be used in the building, and a display that displays the power amount and power load means that can be used in the building It includes a stage, a.

  According to the invention described in claim 1, in each power supply mode of the first mode or the second mode, the amount of power that can be used in the building is calculated, and the amount of power that can be used in the calculated building is calculated. Based on this, it is possible to determine the power load means that can be used in the building.

  The invention of claim 2 is the invention of claim 1, further comprising weather information acquisition means for acquiring weather information, the external power generation device includes a solar power generation device, and the power generation amount calculation means The amount of power that can be used in the first mode and the second mode is calculated based on the amount of storage detected by the storage amount detection means and the amount of power generated by the external power generation device calculated based on the acquired weather information. And the said control means determines the electric power load means which can be used in the said building on the current day and the next day based on the calculated electric energy which can be used in the said building.

  According to the second aspect of the present invention, the amount of power that can be used in the building is calculated from the power generation amount of the solar power generation device calculated based on weather information such as weather forecast, and the building is calculated based on the calculated power amount. Usable power load means can be determined.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, in the first mode, the control means supplies the total charged amount of the storage battery to the building on the day and the next day, In the second mode, a predetermined amount of the stored amount of the storage battery is supplied to the building on that day and the next day.

  According to the invention described in claim 3, the power load means that can be used in the building is determined in each of the first mode in which the power of the storage battery is fully utilized and the second mode in which the power of the storage battery is preserved. can do.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, the control means calculates the power generation amount of the external power generation device on the current day and the next day based on the weather information in the second mode, and When the power generation amount is equal to or greater than a predetermined value, the total amount of the predetermined amount of the stored electricity amount and the power generation amount of the external power generation device on that day or the next day is the amount of power that can be used in the building on that day or the next day. If the power generation amount on the next day is less than a predetermined value, the power generation amount of the external power generation device on that day is set as the amount of power that can be used in the building on that day, and the total power storage amount of the storage battery is used in the building on the next day Use as much power as possible.

  According to invention of Claim 4, according to the electric power generation amount of solar power generation, the electric power of a storage battery can be preserved.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the control means determines a power load means that can be used in the building according to a preset priority order of the power load means. To do.

  According to the fifth aspect of the present invention, the power load means that can be used within the range of the amount of power that can be used can be determined from the higher priority devices.

  As described above, in the first aspect of the invention, in each power supply mode of the first mode or the second mode, the power load means usable in the building is determined and displayed on the display means. Yes. As a result, the user can know which power load means can be used to that extent with respect to power supply to the power load means in the building by the external power supply device including the external power generation device and the storage battery.

  According to the second aspect of the present invention, it is possible to provide a power supply system that takes into account the suppression of operation costs by calculating the power generation amount of the external power supply device including solar power generation and the power consumption amount in the building. Has an effect.

  According to invention of Claim 3, the electric power load means which can be used in a building is displayed in each of the 1st mode which fully utilizes the electric power of a storage battery, and the 2nd mode which preserves the electric power of a storage battery By doing so, the user can know which power load means can be used to that extent.

  According to invention of Claim 4, even if a power failure etc. prolongs by keeping power of a storage battery according to the electric power generation amount of photovoltaic power generation, it can be said that use of electric power can be continued in a building. Has an effect.

  According to the fifth aspect of the present invention, there is an effect that power can be preferentially supplied to power load means such as a refrigerator that requires constant power supply even during a power failure.

It is the schematic which shows an example of the electric power supply system which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of HEMS which concerns on the electric power supply system which concerns on embodiment of this invention. It is the flowchart which showed an example of the process in normal mode in the electric power supply system which concerns on embodiment of this invention. It is a figure which shows an example of the priority table in the electric power supply system which concerns on embodiment of this invention. It is the schematic which shows an example of the display of the display part of HEMS in the normal mode of the electric power supply system which concerns on embodiment of this invention. It is the schematic which shows an example of the allocation of the usage time of an apparatus, and the advice of a time schedule in the electric power supply system which concerns on embodiment of this invention. It is the flowchart which showed an example of the process in ECO mode in the electric power supply system which concerns on embodiment of this invention. It is the schematic which shows an example of the display of the display part of HEMS in the ECO mode of the electric power supply system which concerns on embodiment of this invention.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram illustrating an example of a power supply system 100 according to the present embodiment. As shown in FIG. 1, in the present embodiment, power from commercial grid power 12 is supplied to the distribution board 14 of the building 10. Further, a distribution board current sensor 120 for detecting a current value of power supplied from the system power 12 is provided on the system power side of the distribution board 14.

  A specific distribution board 18 is connected to one of the branch circuits 16 constituting the distribution board 14. The specific distribution board 18 has a power source selection switch 20 inside. The power source selection switch 20 selects “grid power” supplied from the distribution board 14 as the power supplied to the power load means 26 via the branch circuit 22, and an external power generator 28 that is a private power generator. It is possible to switch to “external ON” for selecting the power.

  In the specific distribution board 18, the first branch circuit 22A has a refrigerator 26A, the second branch circuit 22B has a television 26B, the third branch circuit 22C has a lighting fixture 26C, and the fourth branch circuit 22D has a microwave oven. 26D is connected as the power load means 26, respectively. The first branch circuit 22A has a current sensor 24A, the second branch circuit 22B has a current sensor 24B, the third branch circuit 22C has a current sensor 24C, the fourth branch circuit 22D has a current sensor 24D, Each is connected and the current of each branch circuit is detected.

  A storage battery control device 32 is connected to one of the branch circuits 16 of the distribution board 14. The storage battery control device 32 converts the power from the grid power 12 into a direct current having a voltage suitable for charging the storage battery 34, and the direct current discharged from the storage battery 34 can be used by the power load means 26 of the building 10, for example. It has a bidirectional inverter that can convert to 100V, 50Hz AC. As shown in FIG. 1, the power of the storage battery 34 is transmitted to the specific distribution board 18 via the storage battery control device 32. Further, the storage battery control device 32 charges the storage battery 34 with the grid power 12 and the power generated by the external power generation device 28. The storage battery control device 32 calculates the amount of stored electricity that is the power charged in the storage battery 34 based on the voltage of the storage battery 34. In the present embodiment, the storage battery is not limited to the one installed in the site of the building 10, for example, a vehicle including a large capacity storage battery such as EV (Electric Vehicle), HV (Hybrid Vehicle), or PHV. Including.

  The external power generator 28 includes a solar power generator, a fuel cell, and a private power generator using an internal combustion engine. Further, an external power supply current sensor 122 is provided between the external power generation device 28 and the specific distribution board 18 to detect a current supplied from the external power generation device 28 and the storage battery 34 to the specific distribution board 18.

  In the present embodiment, the specific distribution board 18, the external power generation device 28, and the storage battery control device 32 are controlled by a HEMS (Home Energy Management System) 30. For example, the HEMS 30 transmits, to the storage battery control device 32, an instruction as to how much the storage battery 34 is charged based on the storage amount of the storage battery 34 calculated by the storage battery control device 32.

  The distribution board current sensor 120, the current sensors 24A to 24D, and the external power supply current sensor 122 are connected to the HEMS 30. The HEMS 30 calculates the power supplied from the grid power 12 from the detection result of the distribution board current sensor 120. The HEMS 30 calculates the power consumption of each power load means 26 from the detection results of the current sensors 24A to 24D, and calculates the power supplied from the external power generator 28 and the storage battery 34 from the detection results of the external power supply current sensor 122, respectively.

  A terminal device 60 that is a gateway of a network 70 such as the Internet is connected to the HEMS 30. The HEMS 30 can communicate with the weather information server 72 via the terminal device 60 and the network 70, and further acquires weather information such as a weather forecast from the weather information server 72 via the terminal device 60 and the network 70. .

  The weather information server 72 is a server installed in an organization that handles weather information such as the Japan Meteorological Agency, and distributes weather information such as weather forecasts via the network 70.

  In FIG. 1, only four systems of branch circuits of the specific distribution board 18 are shown for simplification, but in this embodiment, the number of branch circuits may be four or more. There is no special limitation.

  The HEMS 30 is connected to a termination device 60 that is a gateway of a network 70 such as the Internet. The HEMS 30 can communicate with the weather information server 72 via the terminal device 60 and the network 70, and can acquire weather information such as a weather forecast from the weather information server 72 via the terminal device 60 and the network 70. Suppose that

  The weather information server 72 is a server installed in an organization that handles weather information such as the Japan Meteorological Agency, and distributes weather information such as weather forecasts via the network 70.

  FIG. 2 is a block diagram showing a schematic configuration of the HEMS 30 according to the power supply system 100 according to the present embodiment. As shown in FIG. 2, the HEMS 30 includes a CPU 36, a ROM 38, a RAM 40, and an input / output port 42. These include a bus 44 such as an address bus, a data bus, and a control bus. Are connected to each other.

  A display unit 46, an operation unit 48, and a memory 50 are connected to the input / output port 42 as various input / output devices. The display unit 46 and the operation unit 48 are integrally configured, and a touch panel provided on the display unit 46 can be applied to the operation unit 48.

  The display unit 46 can display the amount of power consumed by each power load means 26, usable equipment, the state of charging or discharging of the storage battery 34, the amount of power generated by the external power generator 28, and the like.

  The memory 50 stores a program for controlling the specific distribution board 18, a program for controlling the storage battery control device 32, a program for controlling the external power generation device 28, and various information for executing these programs. Further, the memory 50 stores information such as a weather forecast received from the weather information server 72.

  The HEMS 30 performs various types of control such as control of power supplied to the building 10 by developing a program stored in the memory 50 in the RAM 40 and executing it by the CPU 36.

  In the present embodiment, the power consumption amount of each power load means 26 can be calculated from the current values detected by the current sensors 24A to 24D, but each power load means 26 can be controlled by the HEMS 30 and the power consumption amount can be calculated. Including the operating status may be possible. The amount of power consumption based on the detection results of the current sensors 24 </ b> A to 24 </ b> D is stored in the memory 50 as the power usage history of the building 10 in association with the date and time when the power is consumed.

  Since the voltage supplied from the specific distribution board 18 to each power load means 26 is approximately 100 V, in this embodiment, the amount of power can be calculated by multiplying the current value detected by each current sensor by 100. However, in a branch circuit with a large voltage fluctuation, a means for measuring the voltage may be provided separately.

  The input / output port 42 is connected to the specific distribution board 18, current sensors 24A to 24D, the external power generation device 28, the storage battery control device 32, the termination device 60, the distribution board current sensor 120, the external power supply current sensor 122, and the like. ing.

  FIG. 3 is a flowchart showing an example of processing in the normal mode in power supply system 100 according to the present embodiment. In step 200, the occurrence of a power failure is detected based on the fact that the distribution board current sensor 120 no longer detects the supply of power from the grid power 12. In step 202, the power consumption is calculated based on the detection results of the current sensors 24A to 24D.

  In step 204, the amount of power generation that can be used today for the device that is the power load means 26 is calculated. In the present embodiment, the total amount of power generated by the external power generation device 28 such as a solar power generation device and a fuel cell and the amount of power that can be discharged by the storage battery 34 (including EV, HV, PHV) can be used for the device. Amount.

  When the external power generation device 28 is a fuel cell, the amount of power generated today by the external power generation device 28 is calculated based on the rated output of the fuel cell. When the external power generation device 28 is a solar power generation device, the external power source current sensor 122 detects an instantaneous value of the power generated by the solar power generation device at a predetermined time in the morning of today, and the detected instantaneous value and weather information The power generation amount is estimated from today's weather forecast acquired from the server 72. Specifically, it is calculated by multiplying the instantaneous value of the power generation amount at a predetermined time (for example, 7:00 am) by a predetermined coefficient and a predicted value of sunshine hours based on the weather forecast. The predetermined coefficient is a positive value of 1 or more. When the altitude of the sun in the morning is low, the intensity of sunlight irradiated to the solar power generation device is lower than the daily average intensity of sunlight, and is a coefficient for the correction. Various methods for determining the predetermined coefficient can be considered. In this embodiment, the predetermined coefficient is calculated based on the ratio of the statistical value of the daily average sunlight intensity and the statistical value of the sunlight intensity at a predetermined time.

  The amount of power that can be discharged by the storage battery 34 depends on the type of the storage battery 34. In general, since overdischarge significantly shortens the life of the storage battery 34, the amount of power that can be discharged by the storage battery 34 is not the same as the amount of stored electricity, but is a value that is less than the amount of stored power. The HEMS 30 calculates the amount of electric power that can be discharged from the amount of stored electricity according to the type of the storage battery 34.

  In step 206, it is determined how many devices in the priority order can be used today and displayed on the display unit 46 of the HEMS 30. For example, the priority order is defined in the priority order table shown in FIG. In the priority table shown in FIG. 4, the priority, device name, device power consumption, device usage time (frequency), and daily power consumption are recorded and stored in the memory 50 of the HEMS 30. The priority can be arbitrarily set by the user through the operation unit 48 of the HEMS 30, but when it is not set, the rank of the device with the large power consumption is treated as the priority.

  The HEMS 30 subtracts the power consumption of the device from the device with the highest priority from the power generation amount that can be used for the device calculated in step 204. If the result of subtracting the power consumption of a device with a certain priority from the power generation that can be used is 100 Wh or less, it is determined that up to one device with a higher priority than the device with the priority is the device that can be used today. And displayed on the display unit 46 of the HEMS 30.

  In step 208, as the predicted value of the power generation amount of tomorrow's external power generation device 28, the sum of the power generation amount of tomorrow's solar power generation device and the power generation amount of the fuel cell is predicted. Specifically, the power generation amount of the fuel cell is calculated based on the rated output of the fuel cell, and the solar power generation amount is estimated from tomorrow's weather forecast acquired from the weather information server 72.

  In step 210, the predicted output value of tomorrow is displayed. The predicted output value is calculated by subtracting the power generation amount calculated in step 208 from the power generation amount calculated in step 204 to the power amount obtained by subtracting the power consumption amount of the device determined to be usable in step 206. This is the total amount of power. The HEMS 30 displays the calculated power amount on the display unit 46.

  In step 212, it is determined how many devices in the priority order can be used tomorrow and displayed on the display unit 46 of the HEMS 30. The priority order is defined in the priority order table shown in FIG. The HEMS 30 subtracts the power consumption of the device from the device with higher priority from the predicted output value of tomorrow calculated in step 210. If the result of subtracting the power consumption of a device with a certain priority from the power generation that can be used is 100 Wh or less, it is determined that up to one device with a higher priority than the device with the priority is usable tomorrow. And displayed on the display unit 46 of the HEMS 30.

  FIG. 5 is a schematic diagram illustrating an example of display on the display unit 46 of the HEMS 30 in the normal mode of the power supply system 100 according to the present embodiment. On the left side, devices that are currently available are displayed together with the rated power consumption, and further, the output value that the external power generation device 28 can today, the remaining power, and the duration for which power can be supplied are displayed. On the right side of FIG. 5, tomorrow's predicted output and usable devices are displayed together with the allowable usage frequency.

  In step 214, the device usage time is allocated, the time schedule is advised, and the process is terminated. FIG. 6 is a schematic diagram illustrating an example of device usage time assignment and time schedule advice in the power supply system 100 according to the present embodiment. In FIG. 6, usable devices are displayed for each time zone, and the operation mode of the storage battery 34 is displayed for each time zone. Furthermore, the supply and demand of electric power is visualized by displaying the photovoltaic power generation amount 84 and the power consumption 82 of the device in comparison.

  An example of the usage time and time schedule of the device displayed in FIG. 6 is displayed on the display unit of the HEMS 30.

  In the power supply system 100 according to the present embodiment, it is also possible to operate in the ECO mode that preserves the power of the storage battery 34 than in the normal mode described above. FIG. 7 is a flowchart showing an example of processing in the ECO mode in power supply system 100 according to the present embodiment. In the present embodiment, after the user selects the ECO mode by operating the operation unit 48, in step 600, the distribution board current sensor 120 no longer detects the supply of power from the grid power 12. Detecting power outages. In step 602, the power consumption is calculated based on the detection results of the current sensors 24A to 24D.

  In step 604, the power generation amount that can be used for the device today is calculated. In the present embodiment, the total amount of power generated by the external power generation device 28 such as a solar power generation device and a fuel cell and the amount of power that can be discharged by the storage battery 34 (including EV, HV, PHV) can be used for the device. Amount. A specific calculation method is the same as the calculation in the normal mode described in step 204 of FIG.

  In step 606, it is determined based on the weather forecast information acquired from the weather information server 72 whether solar power generation tomorrow is possible. The criterion for determining whether or not solar power generation is possible is when the power generation amount of tomorrow's solar power generation device calculated based on weather forecast information is equal to or greater than a predetermined value. The predetermined value depends on the specifications of the solar power generation device and the power consumption in the building 10, but as an example, the power generation amount corresponds to 50% of the rating of the solar power generation device.

  If the determination in step 606 is affirmative, it is determined in step 608 how many devices in the priority order can be used today and displayed on the display unit 46 of the HEMS 30. The HEMS 30 subtracts the power consumption of the device from the device with the highest priority from the sum of the power generation amount of the solar power generation device and the fuel cell and the value obtained by multiplying the amount of power that can be discharged by the storage battery 34 by 1/2. I will do it. If the result of subtracting the power consumption of a device with a certain priority from the power generation that can be used is 100 Wh or less, it is determined that up to one device with a higher priority than the device with the priority is the device that can be used today. And displayed on the display unit 46 of the HEMS 30.

  In step 610, as the predicted value of the power generation amount of tomorrow's external power generation device 28, the sum of the power generation amount of tomorrow's solar power generation device and the power generation amount of the fuel cell is predicted. Specifically, the power generation amount of the fuel cell is calculated based on the rated output of the fuel cell, and the solar power generation amount is estimated from tomorrow's weather forecast acquired from the weather information server 72.

  In step 612, the predicted output value of tomorrow is displayed. Specifically, a value obtained by adding a value obtained by multiplying the power generation amount estimated in step 610 by the power amount that can be discharged by the storage battery 34 by 1/2 is displayed on the display unit 46 as a predicted output value for tomorrow. .

  In step 614, it is determined how many devices in the priority order can be used tomorrow and displayed on the display unit 46 of the HEMS 30. The priority order is defined in the priority order table shown in FIG. The HEMS 30 subtracts the power consumption of the device from the device with higher priority from the predicted output value of tomorrow calculated in step 612. If the result of subtracting the power consumption of a device with a certain priority from the power generation that can be used is 100 Wh or less, it is determined that up to one device with a higher priority than the device with the priority is usable tomorrow. And displayed on the display unit 46 of the HEMS 30.

  FIG. 8 is a schematic diagram illustrating an example of display on the display unit 46 of the HEMS 30 in the ECO mode of the power supply system 100 according to the present embodiment. On the left side, devices that are currently available are displayed together with the rated power consumption, and further, the output value that the external power generation device 28 can today, the remaining power, and the duration for which power can be supplied are displayed. On the right side of FIG. 8, tomorrow's predicted output and usable devices are displayed together with the allowable usage frequency.

  In step 616, the device usage time is allocated, the time schedule is advised, and the process is terminated.

  If the determination in step 606 is negative, in step 620, the amount of power consumed by the device is subtracted from the power generation amount of the solar power generation device and the fuel cell from the device with higher priority. If the result of subtracting the power consumption of a device with a certain priority from the power generation that can be used is 100 Wh or less, it is determined that up to one device with a higher priority than the device with the priority is usable tomorrow. And displayed on the display unit 46 of the HEMS 30.

  In step 622, the amount of power that can be discharged by the storage battery 34 is displayed as a predicted output value for tomorrow. This is because solar power generation cannot be expected, and the power that can be discharged by the storage battery 34 is regarded as the power that can be used tomorrow.

  In step 624, the power consumption of the device is subtracted from the high priority device from the amount of power that can be discharged by the storage battery 34. If the result of subtracting the power consumption of a device with a certain priority from the power generation that can be used is 100 Wh or less, it is determined that up to one device with a higher priority than the device with the priority is usable tomorrow. Then, the information is displayed on the display unit 46 of the HEMS 30, the procedure is shifted to step 616, and the process is terminated.

  As described above, according to the present embodiment, by determining the power load means that can be used in the building and displaying it on the display means, it is possible to determine which power with respect to power supply to the power load means in the building by the external power supply device The user can know whether the load means can be used to that extent.

DESCRIPTION OF SYMBOLS 10 Building 12 System power 14 Distribution board 16 Branch circuit 18 Specific distribution boards 24A, 24B, 24C, 24D Current sensor 26 Electric power load means 26A Refrigerator 26B Television 26C Lighting fixture 26D Microwave oven 28 External power generation device 32 Storage battery control device 34 Storage battery 36 CPU
38 ROM
40 RAM
42 I / O Port 44 Bus 46 Display Unit 48 Operation Unit 50 Memory 60 Termination Device 70 Network 72 Weather Information Server 82 Device Power Consumption 84 Solar Power Generation 100 Power Supply System 120 Distribution Panel Current Sensor 122 External Power Supply Current Sensor

Claims (5)

A storage battery for storing power to be supplied to the building;
An external power generator for supplying the generated power to the building and the storage battery;
A storage amount detecting means for detecting a storage amount of the storage battery;
A power generation amount calculating means for calculating a power generation amount of the external power generation device;
Setting means for setting the power supply mode to the building to the first mode or the second mode;
The amount of power that can be used in the building in the power supply mode set by the setting unit is calculated from the amount of stored electricity detected by the storage amount detection unit and the power generation amount of the external power generation device calculated by the power generation amount calculation unit. And control means for determining a power load means usable in the building based on the calculated amount of power usable in the building;
Display means for displaying the amount of power available in the building and the power load means;
Power supply system with It further includes weather information acquisition means for acquiring weather information,
The external power generator includes a solar power generator,
The power generation amount calculation means includes the first mode and the second mode based on the power storage amount detected by the power storage amount detection means and the power generation amount of the external power generator calculated based on the acquired weather information. Calculate the amount of power available at
2. The power supply system according to claim 1, wherein the control unit determines a power load unit that can be used in the building on the current day and the next day based on the calculated amount of power that can be used in the building.   In the first mode, the control means supplies the total storage amount of the storage battery to the building on the current day and the next day, and in the second mode, on the current day and the next day, The power supply system according to claim 1, wherein a fixed amount is supplied to the building.   In the second mode, the control means calculates the power generation amount of the external power generation device on the current day and the next day based on the weather information, and when the power generation amount on the next day is equal to or greater than a predetermined value, Each of the total values of the predetermined amount and the power generation amount of the external power generation device on the day or the next day is the amount of power that can be used in the building on the day or the next day, and if the power generation amount on the next day is less than the predetermined value, The power supply system according to claim 3, wherein the amount of power generated by the external power generation device is set to the amount of power that can be used in the building on the same day, and the total amount of power stored in the storage battery is set to the amount of power that can be used in the building on the next day.   5. The power supply system according to claim 1, wherein the control unit determines a power load unit that can be used in the building in accordance with a preset priority order of the power load unit.

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