JP5893995B2 - Power supply system, control device, and power supply method - Google Patents

Description

  The present invention relates to a power supply system, a control device, and a power supply method for supplying power to a plurality of loads from DC generated power and power obtained from an AC system and converted into DC.

  In recent years, efforts to use renewable energy as an energy source for the next generation are increasing, and the photovoltaic power generation system is rapidly expanding. For example, an example of introducing a solar power generation system into each home is increasing. Patent Document 1 describes an example of a solar power generation system.

  In an example of a solar power generation system, power generated by a solar battery is supplied to a power load (hereinafter simply referred to as a load) such as a household electric product. However, in a solar power generation system, since sunlight is an energy source, the supply of energy is unstable depending on the sunlight conditions. Therefore, there may be a shortage of energy for generating the power consumption of the load. Therefore, in order to drive the load stably, when the generated power due to the energy from sunlight is insufficient, the insufficient power is acquired from the commercial power supply system (hereinafter simply referred to as the system) and supplied to the load. A system that maintains the drive of the load in a normal state has been proposed.

JP 09-182316 A

  By the way, in the above-described photovoltaic power generation system, when the power of the interconnected system is interrupted, control such as disconnecting from the system and switching to independent operation by the system is performed according to the system interconnection regulations. However, as described above, the energy from sunlight or the like is unstable, and there is a possibility that the amount of power generation for supplying the power consumption of the load is not satisfied. Then, there is a possibility of causing a problem such as an increase in current in an attempt to maintain a voltage corresponding to the power consumption of the load.

  An object of the present invention made in view of the above problems is to provide a power supply system and the like that can stably supply power to a load even when a power failure occurs in a system.

In order to solve the above-described problem, a power supply system according to the present invention includes a power supply unit that supplies power to a plurality of loads from DC-generated power and power obtained from an AC system and converted to DC, and when power from the AC system is not acquired,-out based on the power available by priority and the power supply portion of each load, to determine the priority load for supplying power, it is supplied to the plurality of loads A first control unit that determines the power to be supplied for each load so that the power to be supplied is less than the power that can be supplied, and each load, and based on the determination result by the first control unit, or supplies power maximum power consumption in the corresponding load, and a second control unit for executing Kano either to or not supply power supply power is less than the maximum power consumption. Here, the determination of power to be supplied includes determination of whether or not to supply power, and determination of the amount of power supplied when power is supplied.

  In a preferred aspect, the first control unit obtains the priority and maximum power consumption of each load from the second control unit, and obtains power to be supplied to the plurality of loads from the maximum power consumption. .

  In another preferred aspect, the first control unit obtains the priority of each load and the detected power consumption from the second control unit, and the past history of the detected power consumption Find the power to be supplied to multiple loads.

  In still another preferred aspect, the priority of each load indicates either supplying all or a part of the power consumed by the load, or not supplying power.

A control device according to another aspect of the present invention includes a power supply unit that supplies power to a plurality of loads from DC-generated power, and power obtained from an AC system and converted to DC, and power from the AC system. when not retrieved,-out based on the power available by priority and the power supply portion of each load, preferentially determine the load for supplying power, the power to be supplied to the plurality of loads can be supplied as below, such power, the first transmit a first control unit for determining the power to be supplied to each of the load, the determination result by the first control unit the second control unit of each load at second control unit to supply the power of maximum power consumption in the load Luke, the maximum power or to supply power less than the power, or the communication unit for controlling so as to execute Kano one which does not supply power And having.

According to still another aspect of the present invention, a control device includes: a power supply unit configured to supply power to a plurality of loads from DC-generated power; and power obtained from an AC system and converted to DC; and power from the AC system when but not retrieved,-out based on the power available by priority and the power supply portion of each load, preferentially determine the load for supplying power, the power to be supplied is supplied to the plurality of loads A communication unit that receives the determination result transmitted from the control device having a first control unit that determines the power to be supplied for each load so as to be less than the possible power, and the maximum power consumption for the corresponding load A second control unit that performs any one of the following: supplying power of less than the maximum power consumption , or not supplying power .

  As described above, the solution of the present invention has been described as an apparatus. However, the present invention can be realized as a method, a program, and a storage medium storing the program, which are substantially equivalent thereto, and the scope of the present invention. It should be understood that these are also included. Note that each step of the method or program uses an arithmetic processing unit such as a CPU or a DSP as necessary in data processing, and the input data, processed / generated data, etc. are stored in an HDD, memory, etc. Is stored in the storage device.

For example, a power supply method that implements the present invention as a method includes a power supply step of supplying power to a plurality of loads from DC generated power and power obtained from an AC system and converted to DC, and the AC system when power is not acquired from the power-out based on the power available by priority and the power supply step of each load, to determine the priority load for supplying power, to be supplied to the plurality of loads And a first control step for determining the power to be supplied for each load so as to be less than the power that can be supplied , and corresponding to each load based on the determination result of the first control step. And a second control step for executing one of supplying power of maximum power consumption to the load, supplying power less than the maximum power consumption , or not supplying power .

  According to the embodiment of the present invention, it is possible to provide a power supply system or the like that can stably supply power to a load even when a power failure occurs in a system.

It is a figure which shows the structure of the electric power supply system in this embodiment. It is a flowchart figure which shows the operation | movement procedure of the electric power supply system 10 in this embodiment. It is a figure explaining the electric power supply control of the load. The example of the log | history of the power consumption of the load 130 is shown.

  Embodiments of the present invention will be described below.

  FIG. 1 is a diagram illustrating a configuration of a power supply system according to the present embodiment. The power supply system 10 includes a power conditioner 104 that supplies power generated by the solar battery 102 to a plurality of loads 130_1, 130_2, and 130_3, and power that is provided in each load and is supplied from the power conditioner 104 to each load. It has the control part 134 which controls. When the generated power of the solar battery 102 is less than the power consumption of the loads 130_1 to 130_3, the power conditioner 104 acquires power from the grid 106 and supplies the power to the loads 130_1 to 130_3. The power conditioner 104 is an example of a “control device” in the present embodiment.

  The loads 130_1 to 130_3 are DC loads that consume DC power as DC. The DC load is, for example, a household electric product such as a dimmable LED lighting, various digital devices that operate at a constant voltage, or a cooking appliance that outputs a constant temperature. In addition, there are loads where the applied voltage and the consumption voltage are linear, and there are also nonlinear loads. DC power is supplied from the power conditioner 104 to the loads 130_1 to 130_3. Here, for convenience, three loads 130_1 to 130_3 are shown, but the number of loads is not limited to the example shown here, and may be two or more. Hereinafter, the loads 130_1 to 130_3 are collectively referred to as the load 130.

  The solar battery 102 is configured, for example, such that power generation units having photoelectric conversion cells are connected in a matrix and output DC power of a predetermined short-circuit current (for example, 10 A). The type of solar cell 102 is not limited as long as it is capable of photoelectric conversion, such as a silicon-based polycrystalline solar cell, a silicon-based single crystal solar cell, or a thin-film solar cell such as CIGS. Here, although a solar power generation system is shown as an example, a power supply system using a power generation unit that generates DC power using renewable energy such as wind power instead of the solar battery 102 is also of this embodiment. Included in the range.

  In the power conditioner 104, the power supply unit 108 supplies power to the load 103 from the DC power generated and the power acquired from the AC system 106 and converted to DC. In the power supply unit 108, the DC / DC converter 110 boosts the direct-current generated power generated by the solar battery 102 to a predetermined link voltage (for example, an arbitrary voltage of 300 to 400 V (volt)). The boosted generated power is supplied to the load 130. Further, the DC / DC converter 110 performs maximum power point tracking control for extracting the generated power of the solar cell 102 so as to follow the power consumed by the load 130. In the power supply unit 108, the bidirectional DC / AC inverter 112 converts AC power input from the system 106 into DC and supplies it to the load 130. Further, when the generated power is larger than the power consumption of the load 130, the bidirectional DC / AC inverter 112 may convert the surplus generated power into AC power and output it to the AC system 14.

  In the power conditioner 104, when the power is not acquired from the grid 106, the power supplied to the entire load 130 is lower than the power that can be supplied from the power supply unit 108 based on the priority of each load 130. Thus, the presence or absence of the power supply of each load 130 and the supplied power are determined. Specifically, the control unit 114 determines the power to be supplied to each of the loads 130 so that the maximum power consumption of the entire load 130 is less than the power that can be supplied. The control unit 114 is, for example, a microcomputer having a nonvolatile storage unit and a processor that executes a control program stored in the nonvolatile storage unit. The control unit 114 is an example of a “first control unit” in the present embodiment.

  The power sensor 120 detects input power (for example, voltage) from the system 106 to the power supply unit 108 and inputs the detection result to the control unit 114. Based on the input power from system 106, control unit 114 detects that power is not acquired from system 106, for example, that system 106 has failed. For example, a power failure is detected when the detected power falls below a predetermined reference power or when the power indicates zero.

  The power sensor 118 detects the power supplied from the power supply unit 108 to the load 130 and inputs the detection result to the control unit 114. The control unit 114 detects power that can be supplied to the load 130, that is, power consumption of the load 130, based on the power supplied to the load 130. For example, when the system 106 has a power failure, the power generated by the solar battery 102 corresponds to the power that can be supplied.

  The power conditioner 104 includes a communication unit 116 that communicates various data and control signals with the load 130. On the other hand, corresponding to the communication unit 116, a communication unit 132 is provided in the load 130. The communication units 116 and 132 are wireless communication means such as Zigbee (registered trademark) and Bluetooth (registered trademark), for example. Alternatively, the communication units 116 and 132 may be wired communication means. Furthermore, the power conditioner 104 has a communication unit 117 that can be connected to a public communication line 140 such as the Internet. Various types of information are acquired from the server device connected to the public communication line 140 by the communication unit 117.

  The load 130 is provided with a control unit 134 in addition to the communication unit 132. The control unit 134 controls power supply to the load 130 in response to a control signal transmitted from the control unit 114 of the power conditioner 104. For example, the control unit 134 cuts off the power supply from the power conditioner 104 to the load 130 and controls the supply amount. Moreover, the control part 134 hold | maintains beforehand the priority and maximum power consumption for every load 130, for example in an internal memory | storage part, and transmits this to the control part 114 of the power conditioner 104. FIG. In addition, the control unit 134 acquires the power consumption of the load 130 and transmits this to the control unit 114. These data transmitted from the control unit 134 are used by the control unit 114 for processing for determining whether or not power is supplied to the load 130. The control unit 134 is, for example, a microcomputer having a nonvolatile storage unit and a processor that executes a control program stored in the non-volatile storage unit. The control unit 134 is an example of a “second control unit” in the present embodiment. The configuration having the control unit 134 and the communication unit 132 is an example of a “control device” on the load side in the present embodiment.

  FIG. 2 is a flowchart showing an operation procedure of the power supply system 10 in the present embodiment. The procedure of FIG. 2 corresponds to the processing procedure of the control unit 114.

  The control unit 114 acquires the maximum power consumption and priority of the load 130 from the load 130 (S202), and stores these data (S204). These data are transmitted from the control unit 134 of the load 130 via the communication units 116 and 132. The procedures S202 and S204 are performed once, for example, when the power conditioner 104 is turned on. Thus, even when the number of connected loads 130 is changed by acquiring the maximum power consumption and priority from the load 130 side, the maximum power consumption necessary for the processing described below, and You can get the priority each time.

  Next, the control unit 114 repeats steps S206 to S216, S218, or S222 in a predetermined cycle of, for example, several seconds to several tens of seconds until the power of the power conditioner 104 is turned off (until S206 becomes Yes). Run. The control unit 114 acquires the power consumption from the control unit 134 of the load 130 and stores it (S208). For example, the control unit 114 transmits a power consumption request to the load 130, and the power consumption is transmitted from the load 130 in response thereto. And the control part 114 judges whether the system | strain 106 has a power failure by procedure S210.

  When a power failure has occurred (Yes in S210), the control unit 114 acquires suppliable power (S212). For example, the control unit 114 acquires generated power. In step S214, the control unit 114 determines whether the number of samples acquired in step S208 is larger than the reference value. The number of samples is accumulated and stored in the storage unit in the control unit 114 every time step S208 is executed. The reference value for the number of samples is an arbitrary value set in advance within a range of “10” to “20”, for example, in order to obtain data leveled to some extent.

  When the number of samples is equal to or less than the reference value (No in S214), the control unit 114 generates a control command for each load 130 and transmits it to each load 130 (S218). At this time, the control unit 114 determines the maximum power consumption of the plurality of loads 130 to the plurality of loads 130 based on the priority of each load 130, the maximum power consumption of the entire load 130, and the suppliable power (generated power). The power to be supplied for each load 130 is determined so as to be lower than the power that can be supplied. Here, a specific example is shown using FIG.

  FIG. 3 is a diagram for explaining the power supply control of the load 130. As shown in FIG. 3, the loads 130_1, 130_2, and 130_3 have priorities “A”, “B”, and “C”, respectively. The priorities are “A” to “C” in descending order. The priority “A” indicates that the power supply should always be maintained. The priority “B” indicates that the supplied power is suppressed when the suppliable power is less than the maximum power consumption. The priority “C” indicates that the power supply is stopped when the suppliable power is less than the maximum power consumption. These priorities are set in advance for each load according to the usage of the loads 130_1 to 130_3. For example, when the loads 130_1, 130_2, and 130_3 are LED lights installed in a small store and are installed in a store, an office, and a warehouse, respectively, the priority is set as follows. For example, a priority “A” is assigned to the store load 130_1 that should be constantly lit, a priority “B” is assigned to the office load 130_2 that can be reduced in illuminance, and a warehouse load 130_3 that can be turned off. The priority “C” is set. In addition, for example, when the load 130 controls electric power and a desired application cannot be achieved, for example, in the case of a cooking utensil or the like, the priority is set to either “A” or “C”. These priorities are written in advance in, for example, the storage unit in the control unit 134 of each load 130 when the control unit 134 is manufactured. Alternatively, an input unit may be provided in the load 130 and the user may set the control unit 134 as needed. The maximum power consumption of the loads 130_1, 130_2, and 130_3 is “1500 W”, “1200 W”, and “1000 W”, respectively. Next, a specific example in the case where the power that can be supplied is 3000 W, 2500 W, and 1300 W when the system 106 has a power failure will be described.

[Specific Example 1]
In the specific example 1, when the system 106 has a power failure, the suppliable power is 3000 W. Then, in order to secure the supply power “1500 W” of the load 130_1 having the priority “A”, the power that can be supplied to the loads 130_2 and 130_3 is “1500 W (= 3000 W-1500 W)”. First, the control unit 114 stops power supply to the load 130_3 having the priority “C”. Then, “1500 W” becomes the power that can be supplied to the load 130_2. Then, the control unit 114 determines the power supplied to the load 130_2 having the priority “B”. At this time, since “1500 W” can be supplied to the maximum power consumption “1200 W” of the load 130_2, the power supplied to the load 130_2 is determined to be “1200 W”.

[Specific Example 2]
In the specific example 2, when the system 106 has a power failure, the suppliable power is 2500W. Then, in order to secure the supply power “1500 W” of the load 130_1 having the priority “A”, the power that can be supplied to the loads 130_2 and 130_3 is “1000 W (= 2500 W-1500 W)”. First, the control unit 114 stops power supply to the load 130_3 having the priority “C”. Therefore, the power that can be supplied to the load 130_2 is “1000 W”. Then, the control unit 114 determines the supply power to the load 130_2 having the priority “B”. At this time, since the suppliable power is “1000 W” for the maximum power consumption “1200 W” of the load 130_2, the supplied power of the load 130_2 is suppressed to “1000 W”.

[Specific Example 3]
In the specific example 3, when the system 106 has a power failure, the suppliable power is 1300W. Then, first, the supply power “1500 W” of the load 130_1 having the priority “A” should be secured, but the suppliable power 1300 W is less than this. Therefore, first, the power supply to the load 130_1 is stopped although the priority is “A”. Then, the power that can be supplied to the loads 130_2 and 130_3 is “1300 W”. Next, the control unit 114 stops power supply to the load 130_3 having the priority “C”. Therefore, the power that can be supplied to the load 130_2 is “1300 W”. Then, the control unit 114 determines the supply power to the load 130_2 having the priority “B”. At this time, since the suppliable power is “1300 W” with respect to the maximum power consumption “1200 W” of the load 130_2, the supply power of the load 130_2 is determined to be “1200 W”. In specific example 3, although the load 130_1 has the highest priority “A”, since the maximum power consumption is large, this cannot be covered. In such a case, in order to obtain a stable power supply, power is preferentially supplied to the load 130_2 having a low maximum power consumption even if the priority is low. By such exceptional processing, a stable power supply can be obtained for the entire load 130.

  In the specific examples 1 to 3, when the power supplied to the load of the priority “B” is suppressed, it is possible to set a lower limit value and control the power so as not to become less than the lower limit value. That is, when there are a plurality of loads with a priority “B” and the power supplied to the first load (for example, a signboard of a store) is made lower than the lower limit value, another second load (for example, a store) Even if it is a case where supply power can be allocated to advertising lighting having a lower priority than the signboard of (1), it is possible to maintain the operation of the first load and not operate the second load. For example, when a desired function cannot be obtained even when the first load is operated with power less than the lower limit value, an optimal power supply can be realized for the entire load. Alternatively, when the suppliable power is less than the lower limit value of the first load, the power supply to the first load is useless, so the power supply to the first load is stopped and the second load It is also possible to use the power supplied to the load.

  Thus, according to the priority for every load, the electric power supply to a required load can be maintained by stopping or suppressing the electric power supply to an unnecessary load. At that time, by using the maximum power consumption as a reference, it is possible to secure a consumable margin up to the maximum power consumption in the load receiving the power supply. Therefore, stable power supply is possible when viewed as the entire load 130.

  Returning to FIG. The control unit 114 executes the above process in step S218, and returns to step S206.

  When the number of samples exceeds the reference value in step S214 (Yes in S214), the control unit 114 obtains power that can be consumed during the current processing based on the past power consumption history of the load 130 in step S216. Supply power control is performed in the same manner as in step S218. That is, in step S218, the maximum power consumption is used as the power to be supplied to the load 130, whereas in step S216, the power to be supplied to the load 130 is obtained from the past power consumption history. Here, the past power consumption history of the load 130 will be described with reference to FIG.

  FIG. 4 shows an example of the power consumption history of the load 130. Here, an example of a history for one day each in the summer and winter seasons when the load 130 is an LED lighting fixture is shown. FIG. 4A shows a transition of power consumption for each time zone of the loads 130_1 to 130_3 in a graph, and FIG. 4B shows an average value for each time zone. The power consumption in each time zone is, for example, an average value of samples of a shorter cycle in each time zone. For example, when comparing summer and winter, the power consumption due to lighting is greater in the winter when the sunshine duration is shorter than in the summer. Further, in comparison with each day time zone, the night time zone consumes more power than the day time zone.

  The control unit 114 retains history data as shown in FIGS. 4A and 4B in the internal storage unit, and according to the date and time zone when executing step S214 in FIG. The power consumption of the load 130 is obtained from the corresponding history. For example, when July-September is summer and December-February is winter, summer or winter is determined from the date of processing. And the power consumption of a corresponding time slot | zone is extracted from the time slot | zone at the time of a process. Thus, the power that can be consumed by using the past average value can be obtained with high accuracy, and control can be performed such that less power is supplied than when the maximum power consumption is used. Therefore, there is a surplus in the power that can be supplied, and power can be supplied to more loads.

  Furthermore, as a modification, the control unit 114 can acquire weather information from, for example, a server device of an information provider via the public communication line 140, and can store a history for each date / time, time zone, and weather situation. . For example, in the case of LED lighting, the power consumption is greater in cloudy or rainy weather with less sunlight than in sunny weather with much sunlight. By doing in this way, the electric power which can be consumed more accurately can be calculated | required.

  Returning to FIG. The control unit 114 executes the above process in step S216, and returns to step S206.

  In step S210, when the system 106 is not out of power (No in S210), the control unit 114 confirms whether the power of the load 130 is controlled (S220), and is not under control (No in S220). Returning to step S206, if control is in progress (Yes in S220), the power supply of the load 130 is restored (S222). At this time, even if the load 130 consumes the maximum power consumption and the supply from the generated power is insufficient, the shortage can be supplied from the system 106.

  It should be noted that the load-side control unit 134 requests itself when the power supply control signal is not transmitted from the power conditioner 104 side even after a certain period of time has passed even though the power consumption was requested in step S208 and responded thereto. The power supply may be automatically cut off on the condition that the priority of “C” is “C”. By doing so, it is possible to avoid a situation in which the control of power supply is hindered due to a communication error or the like.

  As described above, according to the present embodiment, the power supply to the necessary load can be maintained by stopping or suppressing the power supply to the unnecessary load according to the priority for each load. Sometimes stable power supply becomes possible. Furthermore, by performing control using the past history, the power that can be consumed (that is, the power to be supplied) can be obtained with high accuracy, and more loads can be operated.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each means, each step, etc. can be rearranged so that there is no logical contradiction, and a plurality of means, steps, etc. can be combined or divided into one. .

DESCRIPTION OF SYMBOLS 10 Power supply system 102 Solar cell 104 Power conditioner 106 System | system 108 Power supply part 114 Control part 116 Communication part 130 Load 132 Communication part 134 Control part

Claims (13)

A power supply unit that supplies power to a plurality of loads from the DC generated power and the power obtained from the AC system and converted to DC;
When power from the AC system is not acquired,-out based on the power available by priority and the power supply portion of each load, to determine the priority load for supplying power, supplied to said plurality of loads A first control unit that determines the power to be supplied for each load so that the power to be supplied is lower than the power that can be supplied;
Based on the determination result by the first control unit, the power of the maximum power consumption is supplied to the corresponding load, the power less than the maximum power consumption is supplied , or the power is supplied. A second control unit that executes any of the following :
Having a power supply system. In claim 1,
The first control unit acquires the priority and maximum power consumption of each load from the second control unit, and obtains power to be supplied to the plurality of loads from the maximum power consumption.
Power supply system. In claim 1,
The first control unit acquires the priority and detected power consumption of each load from the second control unit, and supplies the priorities to the plurality of loads from the past history of the detected power consumption. Seeking power
Power supply system. In any one of Claims 1 thru | or 3,
The priority of each load indicates either supplying all or part of the power consumed by the load, or not supplying power.
Power supply system. A power supply unit that supplies power to a plurality of loads from the DC generated power and the power obtained from the AC system and converted to DC;
When power from the AC system is not acquired,-out based on the power available by priority and the power supply portion of each load, to determine the priority load for supplying power, supplied to said plurality of loads A first control unit that determines the power to be supplied for each load so that the power to be supplied is lower than the power that can be supplied;
Said first Luke to supply power maximum power consumption in the load determination result by the control unit in the sending to the second control unit of the load said second control unit, the maximum consumption less than power a communication unit for controlling so as to execute Kano any one of not supplied or to supply, or the power of power,
Control device. In claim 5,
The first control unit acquires the priority and maximum power consumption of each load from the second control unit, and obtains power to be supplied to the plurality of loads from the maximum power consumption.
Control device. In claim 5,
The first control unit acquires the priority and detected power consumption of each load from the second control unit, and supplies the priorities to the plurality of loads from the past history of the detected power consumption. Seeking power
Control device. In any of claims 5 to 7,
The priority of each load indicates either supplying all or part of the power consumed by the load, or not supplying power.
Control device. A power supply unit that supplies power to a plurality of loads from the power generated by the DC power and the power acquired from the AC system and converted to DC, and when the power is not acquired from the AC system, the priority of each load and -out based on the power that can be supplied by the power supply unit, preferentially determine the load for supplying power, as the power to be supplied to a plurality of load falls below the power available, for each of the load A communication unit that receives the determination result transmitted from the control device having a first control unit that determines the power to be supplied;
Or supplies power maximum power consumption in the corresponding load, a second control unit for executing Kano either to or not supply power supply power is less than the maximum power consumption,
Control device. In claim 9,
The communication unit transmits the priority and maximum power consumption of each load to the first control unit, and the first control unit receives power to be supplied from the maximum power consumption to the plurality of loads. Desired,
Control device. In claim 9,
The communication unit transmits the priority of each load and the detected power consumption to the first control unit, and the plurality of the plurality of the priorities from the past history of the power consumption detected by the first control unit. Power to be supplied to the load
Control device. In any of claims 9 to 11,
The priority of each load indicates either supplying all or part of the power consumed by the load, or not supplying power.
Control device. A power supply process for supplying power to a plurality of loads from the DC generated power and the power obtained from the AC system and converted to DC;
Wherein when power from the AC system is not acquired,-out based on the power available by priority and the power supply step of each load, to determine the priority load for supplying power, supplied to said plurality of loads A first control step of determining power to be supplied for each load so that power to be supplied is lower than power that can be supplied;
Based on the determination result of the first control step , provided to each load, supply power corresponding to the maximum power consumption to the corresponding load, supply power less than the maximum power consumption , or supply power A second control step for performing any of the following :
A power supply method.

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