JP5964668B2 - Backup power supply system - Google Patents

Description

  The present invention relates to a backup power supply system that controls power supplied to a building.

  In the past, there has been a technology for private power generators that can operate autonomously when the grid power, which is a commercial power source, fails.

  For example, in Patent Document 1, when the system power is a power failure, the power supplied to the load can be supplied to the load with the power generated by a private generator such as a solar battery and the power stored in the storage battery in advance. There has been proposed a solar power generation system capable of supplementing late-night power.

JP 2010-178611 A

  However, the technology described in Patent Document 1 only supplies the power of photovoltaic power generation or storage battery power to the load at the time of a power failure, and limits the load to which the power of solar power generation or power of the storage battery is supplied at the time of power failure. There was a problem of not considering.

  The present invention has been made in consideration of the above-described facts, and an object of the present invention is to provide a backup power supply system capable of limiting power load means to which power is supplied from a storage battery or a private power generator during a power failure.

The invention of claim 1 for solving the above-mentioned problem is a self-power generation means, a storage battery charged with system power or power supplied from the self-power generation means, and a storage amount measuring means for measuring a storage amount of the storage battery. And a plurality of power load means to which power is supplied from the grid power, the private power generation means or the storage battery via any one of a plurality of branch circuits, and the power consumption by the plurality of power load means A power load measuring unit capable of measuring each of the plurality of branch circuits and measuring a time during which power is consumed in each of the plurality of branch circuits , and an input unit capable of designating at least one of the plurality of branch circuits and a display unit the charged amount and the power load measuring means of the said storage battery storage amount measuring means has measured to display the power consumption measured with, when the system power is power failure Power load connected to each of the plurality of branch circuits based on the time consumed power in each of the power consumption and the plurality of branch circuits in each of said plurality of branch circuits power load measuring means has measured The priority of each of the plurality of branch circuits is determined by estimating the attribute of the means, the plurality of branch circuits are displayed on the display means in descending order of the priority, and the branch circuit displayed on the display means And a power supply control device for supplying power from the private power generation means or the storage battery to the branch circuit specified by the input means .

According to the first aspect of the present invention, in the event of a power failure, the power is supplied to the designated branch circuit, and when the branch circuit is designated, the storage amount of the storage battery and the amount of power supplied to each power load means are determined. It is possible to visit. In addition, the priority of each branch circuit is estimated by estimating the attribute of the power load means connected to each of the branch circuits based on the amount of power consumed in each branch circuit and the time that each of the power load means consumes power. Ranking can be determined.

According to a second aspect of the present invention, in the first aspect of the present invention, the power supply control device is connected to a branch circuit that is estimated to be connected to a refrigerator and a device that operates for 24 hours with a maximum added point. The second largest added point to the estimated branch circuit, the third largest added point to the branch circuit connected to the power load means used immediately before the power failure, and the branch circuit to which power is supplied at the previous power failure 4 is added to the branch circuit designated as “4”, and the priorities are determined in the descending order of the sum of the added points .

According to the second aspect of the present invention, the priority of power supply can be determined by adding points according to the attributes of the connected power load means for each branch circuit.

According to a third aspect of the present invention, in the invention according to the second aspect, the power supply control device calculates a maximum power consumption and an average power consumption for each of the plurality of branch circuits, and calculates the maximum power consumption and the average power consumption. It is estimated that the refrigerator is connected to the branch circuit where the difference between the two exceeds the determination value .

According to the invention described in claim 3, since the refrigerator consumes a large amount of power when the induction motor is operated to compress the refrigerant, the difference between the maximum power consumption and the average power consumption exceeds the determination value. It can be estimated that a refrigerator is connected to the circuit.

The invention according to claim 4 is the invention according to claim 2 or 3, wherein the power supply control device calculates a minimum power consumption within 24 hours for each of the plurality of branch circuits, and the minimum power consumption is 0 W. It is estimated that a device that operates for 24 hours is connected to a branch circuit that is not .

According to invention of Claim 4, it can be estimated that the apparatus which operate | moves for 24 hours is connected to the branch circuit whose minimum power consumption in 24 hours is not 0W.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the power supply control device is configured such that the priority order is determined when no branch circuit is designated by the input means within a predetermined time. The power of the private power generation means or the storage battery is supplied to the plurality of branch circuits .

According to the fifth aspect of the present invention, when the branch circuit to which power is supplied is not designated within a predetermined time , power is supplied to the branch circuit according to the determined priority order.

  As described above, the invention according to claim 1 limits the power load means to which power is supplied from the storage battery or the private power generator at the time of power failure by supplying power to the designated power load means at the time of power failure. It has the effect of being able to.

According to the second aspect of the present invention, there is an effect that a branch circuit to which power supply is given priority can be appropriately determined by adding points according to the attribute of the power load means .

According to invention of Claim 3, it has the effect that the branch circuit to which the refrigerator in which electric power supply has the highest priority is connected can be estimated.

According to the fourth aspect of the present invention, there is an effect that it is possible to estimate a branch circuit to which a device operating for 24 hours for which power supply is prioritized is connected.

According to invention of Claim 5, it has the effect that electric power can be supplied to an electric power load means at the time of a power failure based on the determined priority .

It is the schematic which shows an example of the backup electric power feeding system which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of HEMS in the backup electric power feeding system which concerns on embodiment of this invention. It is a flowchart of the process for determining whether it is a branch circuit to which the refrigerator in the electric power feeding system which concerns on embodiment of this invention is connected. It is the figure which showed an example of the power consumption of each branch circuit used for determination whether it is a branch circuit to which the refrigerator in the electric power feeding system which concerns on embodiment of this invention is connected. It is a flowchart of the process for determining whether the apparatus which operate | moves for 24 hours in the electric power feeding system which concerns on embodiment of this invention is the branch circuit connected. It is the figure which showed an example of the power consumption of each branch circuit used for determination whether the apparatus which operate | moves for 24 hours in the electric power feeding system which concerns on embodiment of this invention is a connected branch circuit. It is a figure which shows an example of the determination table used when determining the branch circuit which preferentially supplies electric power at the time of a power failure in 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 showing an example of a backup power supply system according to an embodiment of the present invention.

  In the present embodiment, power from the grid power 12 is supplied to the distribution board 14 of the building 10 through the main breaker 100.

  On the system power side of the main breaker 100, a main breaker current sensor 120 that detects the current value of the power supplied from the system power 12 is provided.

  In FIG. 1, it is assumed that a solid line is a power line to which power is supplied and a broken line is an information line through which measurement data or control information flows.

  In addition to the grid power 12, the distribution board 14 is supplied with power from a solar power generation device 16 that is a private power generation device via a solar power generation breaker 102. The solar power generation device 16 is provided with a solar power generation control device 18 that is controlled by a HEMS (Home Energy Management System) 30 that measures the power generation amount of the solar power generation device and manages and controls energy in the building. ing.

  In the present embodiment, the private power generator is not limited to a solar power generator, and may be a power generator using an internal combustion engine, a fuel cell, or the like.

  The power supplied from the grid power 12 and the photovoltaic power generation device 16 to the distribution board 14 is supplied to the home appliances 32 and the housing equipment 34, which are power load means, via the branch circuits 22A and 22B, respectively. In addition, a storage battery 60 capable of charging the power supplied from the system power 12 is connected to the distribution board 14 via the branch circuit 22C.

  The branch circuits 20A to 20C are provided with current sensors 22A to 22C for measuring the current values of the branch circuits 20A to 20C, respectively. Information lines from the current sensors 22 </ b> A to 22 </ b> C are connected to the HEMS 30 together with information lines for the HEMS 30 to control the distribution board 14.

  The branch circuits 20A to 20C of the distribution board 14 are respectively provided with branch breakers 24A to 24C for switching the branch circuits 20A to 20C to an on state or an off state, and the branch breakers 24A to 24C are controlled by the HEMS 30. .

  In FIG. 1, only three systems of branch circuits are shown for simplification of description, but in this embodiment, three or more systems or three systems or less may be used, and the number of branch circuits is not particularly limited. .

  The storage battery 60 is a secondary battery that can be charged and discharged, such as a lead storage battery, a nickel metal hydride battery, or a lithium ion battery. Since one cell of these secondary batteries has an electromotive force of approximately 1 to 2 V, in this embodiment, a plurality of cells are connected in series so that a desired voltage can be obtained. Further, a desired current can be obtained by bundling a plurality of aggregates composed of a plurality of cells connected in series so as to obtain a desired voltage.

  In addition, the packaged storage battery 60 converts alternating current (for example, 100 V, 50 Hz) supplied through the distribution board 14 into direct current having a voltage suitable for charging the storage battery, and the storage battery 60 is discharged. Conversion means (not shown) such as a bidirectional inverter capable of converting direct current into alternating current supplied from the distribution board 14 to the home appliance 32 and the housing equipment 34 is provided.

  Furthermore, the storage battery 60 includes a storage battery control device 62 that controls charging / discharging of the storage battery 60 and measures the voltage value of the storage battery 60, and is controlled by the HEMS 30 together with the above-described inverter.

  The HEMS 30 monitors the amount of power stored in the storage battery 60 based on the voltage value of the storage battery 60 measured by the storage battery control device 62 provided in the storage battery 60.

  HEMS backup power lines 72 and 74 for supplying power for backing up the HEMS 30 in the event of a power failure are connected to the HEMS 30 from the photovoltaic power generation device 16 and the storage battery 60 to the HEMS 30 separately from the power line for supplying power to the distribution board 14. Has been.

  In the event of a power failure, the HEMS 30 supplies the power of the solar power generation device 16 or the storage battery 60 to the home appliance 32 and the housing equipment 34 that are the self-machine and the power load means.

  FIG. 2 is a block diagram showing a schematic configuration of the HEMS 30 according to the backup power supply system 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.

  As an example, the display unit 46 displays the power generation amount of the solar power generation device 16, the power storage amount of the storage battery 60, and the power consumption amounts of the home appliance 32 and the residential equipment 34.

  Further, when the operation unit 48 is a touch panel provided on the display unit 46 that can display a list of power load means at the time of a power failure, an operation for designating the displayed power load means can be performed.

  The HEMS 30 turns on the power load means designated by the operation unit 48, for example, the branch breaker 24 </ b> A connected to the home appliance 32, so that the solar power generation device 16 or the storage battery 60 is connected to the designated power load means. Electric power can be supplied.

  The memory 50 stores a program for controlling the branch breakers 24A to 24C, a program for controlling the storage battery control device 62, a program for controlling the photovoltaic power generation control device 18, various information for executing these programs, and the like. Yes.

  The HEMS 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.

  The memory 50 may store the priority order of the power load means in advance.

  The HEMS 30 may supply the power of the solar power generation device 16 or the storage battery 60 to the power load means that is defined in the higher order in the priority order stored in the memory 50.

  Further, the distribution board 14, the photovoltaic power generation control device 18, the storage battery control device 62, and the like are connected to the input / output port 42.

  Subsequently, control of the HEMS 30 according to the present embodiment will be described. In this Embodiment, it is possible to memorize | store in the memory 50 previously the priority in which the electric power of the solar power generation device 16 or the storage battery 60 is shared at the time of a power failure.

  Such priorities may be created based on an operation from the operation unit 48 and stored in the memory 50, but based on the amount of power consumed by each power load means and the time when each power load means consumes power. May be determined.

  Hereinafter, in the present embodiment, a procedure for determining the priority order of the power load means by estimating the attribute of the power load means connected to each branch circuit based on the measurement results of the current sensors 22A to 22C. explain.

  More specifically, based on the power consumption of the branch circuit to which the power load means is connected, whether or not a refrigerator is connected to each branch circuit and whether or not a device that operates for 24 hours is connected to each branch circuit Determine whether or not.

  This is because the refrigerator should be preferentially supplied with electric power in order to store refrigerated goods, and equipment such as a facsimile machine that is required to operate for 24 hours should also be preferentially supplied with electric power.

  First, control for determining whether or not the branch circuit is connected to the refrigerator will be described. FIG. 3 is a flowchart of a process for determining whether the branch circuit is connected to the refrigerator in the power supply system according to the present embodiment. Note that each procedure shown in FIG. 3 is individually performed in each branch circuit.

  In step 300, the current value of the branch circuit related to the determination is measured every predetermined time by the current sensor.

  The predetermined time may be various lengths, and in this embodiment, it is about 10 minutes. However, this predetermined time can be changed in consideration of the characteristics of the connected equipment such as a refrigerator. It may be about minutes.

  In step 302, the power consumption of the branch circuit is calculated from the measured current value. Since the voltage of power supplied to facilities such as buildings is approximately 100V, if the current value of each branch circuit can be measured, the power consumption of each branch circuit is calculated by the product of the measured current value and the voltage value of 100V. Therefore, a separate means for measuring the voltage is not required in this embodiment.

  However, in a branch circuit in which voltage fluctuation or the like may occur, in addition to the current sensors 22A to 22C, a means for measuring a voltage may be separately provided in each branch circuit.

  In step 304, the measured current value and the calculated power consumption are stored in the memory 50.

  In step 306, it is determined whether or not the current has been measured a prescribed number of times. If the prescribed number of times has been measured, the procedure proceeds to step 308. Whether or not the measurement has been performed a specified number of times can be determined by whether or not the current value stored in the memory 50 is a number corresponding to the specified number of times.

  The specified number of times is the number of times that it can be determined whether or not a refrigerator is connected to each branch circuit. The number of times can be various, but in order to grasp the characteristics of the device from the power consumption, it is necessary to grasp the change in the power consumption at each time of day, as in this embodiment. If it is desirable to measure every 10 minutes, it is possible to measure a total of 144 times for 24 hours.

  If it is determined in step 306 that the current measurement has not been performed a predetermined number of times, the procedure is returned to step 300 or earlier, and the current measurement is performed again.

  In step 308, the maximum power consumption and the average power consumption are calculated from the power consumption for the specified number of times stored in the memory 50.

  FIG. 4 is a diagram showing an example of the power consumption of each branch circuit used for determining whether or not it is a branch circuit to which a refrigerator is connected in the present embodiment. Average power consumption, maximum power consumption, and minimum power consumption are respectively calculated.

In step 310, it is determined whether a refrigerator is connected to the branch circuit according to the following equation (1).
Maximum power consumption-average power consumption> specified value (1)

  When the refrigerator compresses the refrigerant by operating the induction motor, the power consumption corresponding to 5 to 10 times that of the standby state suddenly occurs, so that the maximum power consumption protruding from the average power consumption is recognized. It can be determined that a refrigerator is connected to the branch circuit.

  Since various values are conceivable depending on the power consumption characteristics of each refrigerator, it is desirable that the determination value be calculated statistically through tests. In this embodiment, as an example, the determination value is 300 W.

  In step 310, if the difference between the maximum power consumption and the average power consumption exceeds a specified value according to the equation (1), it is determined in step 312 that a refrigerator is connected to the branch circuit, The process according to the flowchart ends.

  In step 310, when the difference between the maximum power consumption and the average power consumption is equal to or less than a specified value according to the equation (1), it is determined in step 314 that the refrigerator is not connected to the branch circuit, and the flowchart of FIG. The process by is terminated.

  As described above, according to the procedure of the flowchart of FIG. 3, it is possible to determine whether or not a refrigerator is connected to the branch circuit from the tendency of power consumption of the branch circuit.

  Next, a process of determining whether or not a device that operates for 24 hours is connected to the branch circuit in the present embodiment will be described with reference to FIG. FIG. 5 is a flowchart of processing for determining whether or not a device operating for 24 hours in the power feeding system according to the embodiment of the present invention is a branch circuit connected thereto. Note that each procedure shown in FIG. 5 is performed individually in each branch circuit.

  In step 500, the 24-hour counter is reset to 0, and in step 502, current measurement is started every predetermined time. The predetermined time may have various lengths, and is 10 minutes in the present embodiment.

  In step 504, the power consumption of the branch circuit is calculated from the measured current value.

  In step 506, the measured current value and the calculated power consumption are stored in the memory 50.

  In step 508, it is determined whether or not 24 hours have elapsed since the start of current measurement with reference to the 24-hour meter. If 24 hours have not elapsed since the start of measurement, the procedure is changed to step 500 or earlier. return.

  If it is determined in step 508 that 24 hours have elapsed since the start of current measurement, the minimum power consumption of the branch circuit is calculated in step 510.

  FIG. 6 is a diagram showing an example of the power consumption of each branch circuit used for determining whether or not a device operating for 24 hours in the power supply system according to the present embodiment is a connected branch circuit. In FIG. 6, the current value of each branch circuit is measured every 10 minutes for 24 hours, the power consumption of each branch circuit is calculated from the measured current value, and the minimum power consumption of each branch circuit is further calculated. ing.

  In step 512, it is determined whether or not the minimum power consumption is 0 W. If 0 W, in step 514, the branch circuit is not connected to a device that operates for 24 hours, and the processing in FIG. Since some devices consume weak power in a standby state, in step 512, when the minimum power consumption is less than a predetermined threshold, it may be determined that the minimum power consumption is 0 W. Although various values can be considered as the threshold, it can be considered to be about 3 to 5 W as an example.

  If it is determined in step 512 that the minimum power consumption is not 0 W, it is determined in step 516 that a device that operates for 24 hours is connected to the branch circuit, and the processing in FIG.

  As described above, according to the processing of FIG. 5, it is possible to determine whether or not a device that operates for 24 hours is connected to each branch circuit.

  In this embodiment, in addition to determining whether or not a refrigerator is connected to each branch circuit described above and whether or not a device that operates for 24 hours is connected to each branch circuit, it is used immediately before a power failure. And the branch circuit designated as the branch circuit to which power is supplied at the time of the previous power failure.

  First, identification of the branch circuit used immediately before the power failure will be described.

  It is desirable that the branch circuit, which is used immediately before the power failure, that is, supplied with power, is continuously supplied with power even if a power failure occurs. In the present embodiment, since the power consumption in time series of each branch circuit is stored in the memory 50, the branch circuit used immediately before the occurrence of the power failure is specified based on the storage.

  Specifically, the HEMS 30 determines that a power failure occurs when the main breaker current sensor 120 that detects a current from the grid power 12 to the main breaker 100 detects a current value 0A. Further, the branch circuit used immediately before the power failure is specified from the time-series current value in each branch circuit stored in the memory 50 and the time when the power failure is determined.

  Next, a branch circuit designated as a branch circuit to which power is supplied at the previous power failure will be described.

  Since the branch circuit designated as the branch circuit to which power is supplied at the previous power failure is highly likely to be connected to an important device, it is desirable that power be supplied at the next power failure. In the present embodiment, the power stored in the memory 50 is supplied at the time of the previous power failure with reference to the history of operating the branch breakers 24A to 24C in order to turn on the specific power load means. Identify the branch circuit designated as the branch circuit.

  In the present embodiment, since the operation of designating the power load means to be used at the time of a power failure is possible from the operation unit 48, the history of operations from the operation unit 48 is stored in the memory 50, so that it was used at the time of the previous power failure. The power load unit, the branch breaker and the branch circuit related to the power load unit can be identified from the operation history of the operation unit 48 stored in the memory 50.

  As described above, in this embodiment, (1) a branch circuit to which a refrigerator is connected, (2) a branch circuit to which a device that operates for 24 hours is connected, and (3) it is used immediately before a power failure. Branch circuit, (4) Each branch circuit designated as a branch circuit to which power is supplied at the time of the previous power failure was determined.

  In the present embodiment, based on the items (1) to (4), a branch circuit to which power supply should be prioritized in the event of a power failure is determined.

  Specifically, (1) the largest added point to the branch circuit determined to be connected to the refrigerator, and (2) the second largest to the branch circuit determined to be connected to a device that operates for 24 hours. (3) Add the third largest point to the branch circuit used immediately before the power failure. (4) Add the fourth largest point to the branch circuit designated as the branch circuit to which power is supplied at the previous power failure. Each is performed, and a branch circuit with a large sum of added points is determined as a branch circuit to which power supply should be prioritized in the event of a power failure.

  In the present embodiment, the determination relating to the items (1) to (4) is performed in all of the plurality of branch circuits. Therefore, the branch circuit in which the sum of the added points for all the items (1) to (4) is maximized is the branch circuit to which power is to be supplied with the highest priority in the event of a power failure.

  FIG. 7 is a diagram illustrating an example of a determination table used when determining a branch circuit that preferentially supplies power during a power failure in the present embodiment.

  In FIG. 7, (1) 5 points to the branch circuit determined to be connected to the refrigerator, (2) 4 points to the branch circuit determined to be connected to a device that operates for 24 hours, (3 ) Add 2 points to the branch circuit used immediately before the power failure, and (4) Add 1 point to the branch circuit designated as the branch circuit to which power is supplied at the previous power failure. Sums are calculated, and priorities are given in descending order of the sum of points.

  In the present embodiment, the priority order of each branch circuit obtained as shown in FIG. 7 is displayed on the display unit 46 so that the user can refer to the branch circuit to be used at the time of a power failure. Moreover, you may select the branch circuit which HEMS30 uses at the time of a power failure by automatic control according to the displayed priority.

  The selection of a branch circuit to be used at the time of a power failure by automatic control may be executed when the user does not designate a branch circuit to be used at the time of a power failure within a predetermined time. The predetermined time may be about several minutes to 10 minutes, or may be about several hours to 24 hours. Moreover, when the branch circuit used at the time of a power failure is selected by automatic control, you may make it alert | report to the display part 46 to that effect.

  In the present embodiment, the branch circuit having the maximum sum of the above points may be displayed as a branch circuit in which power supply is given priority in the event of a power failure. Further, the HEMS may select the branch circuit having the maximum sum of the above points as a branch circuit to be used in the event of a power failure by automatic control, or the user may be able to customize the automatic control by HEMS later.

  Further, in the present embodiment, depending on the time zone when the power failure occurs, from the branch circuit where power supply is given the highest priority in the event of a power failure, the first and second priority of the above priority, or the first priority of the above priority Up to the third place may be displayed as a branch circuit in which power supply is prioritized during a power failure.

  For example, power consumption is considered to be small at midnight, so the 1st to 3rd priority orders are displayed as branch circuits where power supply is prioritized during a power outage, and hours when power consumption is high during the daytime etc. In the case of a power failure, it may be possible to display a branch circuit where power supply is given the highest priority.

  In addition, the HEMS 30 knows in advance the power that can be supplied from the storage battery and the private power generator, and when the time at which the blackout is started and the time at which the blackout ends is clear in advance in a so-called planned power outage, A branch circuit that can supply power during the planned power failure may be determined from branch circuits having a high sum and high priority, and the determination result may be displayed on the display unit 46.

  The information on the planned power outage may be acquired via a network or may be input from the operation unit 48.

  For example, the HEMS 30 extracts the period of the planned power outage from the information on the planned power outage, and the power consumed by each branch circuit during the period of the planned power outage based on the power consumption amount of each of the plurality of branch circuits stored in the memory 50. Estimate the amount.

  The estimated amount of electric power is compared with the amount of electricity stored in the storage battery 60. If the estimated amount of electric power is equal to or less than the amount of electricity stored in the storage battery 60, the electric power of the storage battery 60 is supplied to all branch circuits at the time of a planned power outage.

  When the estimated electric power amount exceeds the electric storage amount of the storage battery 60, the electric power of the storage battery 60 is supplied to the branch circuit defined in the higher order in the priority order at the time of the planned power outage.

  The storage amount of the storage battery 60 can be calculated from the voltage value of the storage battery 60 measured by the storage battery control device 62, and the power consumption amount of each branch circuit can be calculated from the current values measured by the current sensors 22A to 22C.

  Moreover, when the electric power by a private power generation device such as the solar power generation device 16 can be used in addition to the storage battery 60, the amount of power estimated as the amount of power consumed by each branch circuit during the planned power outage and the storage of the storage battery 60 Compare the amount of power with the amount of power generated by the private power generator.

  When the estimated power amount is equal to or less than the sum of the power storage amount of the storage battery 60 and the power generation amount of the private power generation device, the power of the storage battery and the private power generation device is supplied to all branch circuits at the time of the planned power outage.

  When the estimated power amount exceeds the sum of the power storage amount of the storage battery 60 and the power generation amount of the private power generation device, the power of the storage battery and the private power generation device is supplied to the branch circuit defined in the higher order in the priority order at the time of the planned power outage .

  In the present embodiment, when the private power generation device is a power generation device by an internal combustion engine, a fuel cell, or a solar power generation device, the power that can be supplied by the private power generation device is grasped based on the rated output of these power generation devices. be able to.

  Or you may make it provide separately the current sensor and voltage sensor for measuring the electric power generation amount of a private power generation device.

  The electric power that can be supplied by the private power generation device based on the average value of the results measured by the current sensor and the voltage sensor in a predetermined period, cumulatively stored in the memory 50, the results measured by the current sensor and the voltage sensor. Can be grasped.

  The predetermined period may be a period of a certain length such as the last week or the last month.

  In the present embodiment, the display unit 46 displays the time during which power can be supplied by the storage battery or the private power generator from the power that can be supplied by the storage battery or the private power generator and the power consumption of each branch circuit. May be.

  For example, the display unit 46 may display a message “Power can be supplied for another 5 hours by turning off the power of all devices other than the refrigerator and the 24-hour operation device” to prompt the user to save power. Is possible.

  As described above, in the present embodiment, the branch circuit to which power is to be preferentially supplied is determined based on the power consumption tendency of each branch circuit, and the power supplied from the storage battery or the private power generator during a power failure A backup power supply system capable of limiting the load means can be provided.

DESCRIPTION OF SYMBOLS 10 Building 12 System electric power 14 Distribution board 16 Photovoltaic power generation device 18 Photovoltaic power generation control device 20A, 20B, 20C Branch circuit 22A, 22B, 22C Current sensor 22A, 22B, 22C Branch circuit 24A, 24B, 24C Branch breaker 30 HEMS
32 Home appliance 34 Housing equipment 36 CPU
38 ROM
40 RAM
46 Display Unit 48 Operation Unit 50 Memory 60 Storage Battery 62 Storage Battery Control Device 72, 74 HEMS Backup Power Line 100 Main Breaker 120 Main Breaker Current Sensor

Claims (5)

Own power generation means,
A storage battery charged with system power or power supplied from the private power generation means;
A storage amount measuring means for measuring a storage amount of the storage battery;
A plurality of power load means to which power is supplied from the grid power, the private power generation means or the storage battery via any one of a plurality of branch circuits ;
A power load measuring means capable of measuring the amount of power consumed by each of the plurality of power load means for each of the plurality of branch circuits and measuring the time consumed by each of the plurality of branch circuits;
Input means capable of designating at least one of the plurality of branch circuits , and display means for displaying the storage amount of the storage battery measured by the storage amount measurement means and the power consumption measured by the power load measurement means. Including the plurality of branch circuits based on the amount of power consumed in each of the plurality of branch circuits measured by the power load measuring means and the time when power is consumed in each of the plurality of branch circuits. The priority of each of the plurality of branch circuits is determined by estimating the attribute of the power load means connected to each of the branch circuits, and the plurality of branch circuits are displayed on the display means in descending order of priority. is allowed, and the power supply control device supplies electric power of the private power generation means or the storage battery to the designated branch circuit by the input means of the branch circuit which is displayed on the display means
A backup power supply system. The power supply control device gives the largest additional point to the branch circuit estimated to be connected to the refrigerator, the second largest additional point to the branch circuit estimated to be connected to a device that operates for 24 hours, and The third largest point is added to the branch circuit to which the power load means used immediately before is connected, and the fourth largest point is added to the branch circuit designated as the branch circuit to which power is supplied at the previous power failure. The backup power supply system according to claim 1, wherein the priority order is determined in descending order of the sum of added points. The power supply control device calculates a maximum power consumption and an average power consumption for each of the plurality of branch circuits, and a refrigerator is connected to the branch circuit in which a difference between the maximum power consumption and the average power consumption exceeds a determination value. The backup power supply system according to claim 2, which is estimated to be present. The power supply control device calculates a minimum power consumption within 24 hours for each of the plurality of branch circuits, and estimates that a device that operates for 24 hours is connected to a branch circuit whose minimum power consumption is not 0 W. The backup power supply system according to claim 2 or 3. The power supply control device supplies power of the private power generation means or the storage battery to the plurality of branch circuits according to the priority when there is no branch circuit designation by the input means within a predetermined time. 5. The backup power supply system according to any one of 4 above.

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