JP2010183697A - Power supply system and power supply method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress deterioration of a secondary battery and to prolong the life of the secondary battery. <P>SOLUTION: In a power supply system 10, independent power supply-type devices 20a and 20b having power generating devices 30a and 30b generating power by using natural energy, electricity accumulating units 31a and 31b storing electricity, load devices 32a and 32b to which power is supplied and controllers 34a and 34b controlling them are connected in parallel. When a voltage value of the electricity accumulating unit 31a in the same independent power supply-type device 20a is within a deterioration voltage range, one device among the power generating device 30a in the independent power supply-type device 20a which is the same as the electricity accumulating unit 34a, the power generating device 30b in the other independent power supply-type device 20b, and the electricity accumulating unit 34b in the other independent power supply-type device 20b is selected. Voltage of the power accumulating unit 31a is controlled to be out of the deterioration voltage range. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power supply system and a power supply method thereof.

Lithium secondary batteries are known to degrade rapidly when overcharged or overdischarged. To avoid performance degradation, secondary batteries do not go into an overcharged or overdischarged state. It has been proposed to control charge and discharge to be used within a predetermined voltage range.
Further, for example, Japanese Patent Laid-Open No. 2000-058134 discloses a technique for suppressing deterioration by operating a lithium secondary battery using a manganese-based positive electrode material whose performance is significantly deteriorated in a high-temperature atmosphere on the high-pressure side. It is disclosed.

JP 2000-058134 A

  However, in the invention of Patent Document 1, in the case of extending the life of the large-sized lithium secondary battery system, for example, “10 years or more”, not only the high temperature atmosphere but also the normal temperature are included. There has been a problem that the performance deterioration tendency has to be taken into consideration in the battery operating conditions.

  The present invention has been made to solve the above-described problem, and is a power supply system capable of suppressing the deterioration of the secondary battery based on the performance deterioration tendency of the secondary battery and extending the life of the secondary battery. An object is to provide a power supply method and a power supply program.

  In order to solve the above problems, the present invention employs the following means.

  The present invention provides a power generation device that generates power using natural energy, a power storage device that stores electric power, a load device that is supplied with electric power, and a control that controls the power generation device, the power storage device, and the load device, respectively. A power supply system comprising a plurality of independent power supply devices connected in parallel, wherein the control device of one independent power supply device can communicate with the control device of another independent power supply device When it is determined whether the voltage value of the power storage device in the same independent power supply type device is within the deterioration voltage range, and it is determined that the voltage value is within the deterioration voltage range And selecting at least one of a power generation device in the same independent power supply type device as the power storage device, a power generation device in another independent power supply type device, and a power storage device in another independent power supply type device. The power storage device Providing power supply system and performs control so that the voltage out of degradation voltage range.

According to such a configuration, a power generation device that generates power using natural energy, a power storage device that stores power, a load device that is supplied with power, and the power generation device, the power storage device, and the load device are controlled. A plurality of independent power supply type devices including a control device are connected in parallel. Each of the control devices included in each independent power supply type device is the same when it is determined that the voltage value of the power storage device provided in the same independent power supply type device is within a deteriorated battery range with a high battery performance deterioration rate. At least one of a power generation device in the independent power supply type device, a power generation device in another independent power supply type device, and a power storage device in another independent power supply type device, and the voltage of the power storage device Is controlled so that the voltage is outside the range of the degraded voltage.
Accordingly, for example, when the power storage device needs to be charged, the shortage of power can be supplied from other devices, and the power can be easily secured.
In addition, by controlling the voltage of the power storage device to a value outside the deterioration voltage range, it is possible to control the power storage device to be within a voltage range where the deterioration rate of the performance of the power storage device is low.

  In the power supply system, the control device selects a device that supplies power to the power storage device based on operation information of each independent power supply device received from the control device of another independent power supply device. It is good.

  In this way, the control device of each independent power supply type device and the control device of another independent power supply type device mutually exchange the operation information of each independent power supply type device and determine the device that supplies power to the power storage device Therefore, it is possible to select a device having surplus power as a power supply source device. In addition, the operation information of the independent power source device is, for example, charging information that is information on the charging status of the power storage device, power generation information that is information on the operating status of the power generating device, and load information that is information on the operating status of the load device. It is.

  The present invention provides a power generation device that generates power using natural energy, a power storage device that stores electric power, a load device that is supplied with electric power, and a control that controls the power generation device, the power storage device, and the load device, respectively. A power supply system comprising a plurality of independent power supply type devices connected in parallel, comprising a central control means communicably connected to the control device of each independent power supply type device, the central control means Determining whether the voltage value of the power storage device in each independent power supply type device is within the degradation voltage range based on the operation information of each independent power supply type device received from each control device, When it is determined that the voltage value is within the deterioration voltage range, the power generation device in the same independent power supply type device as the power storage device, the power generation device in another independent power supply type device, and the other independent power supply type device Among power storage devices, Even without selects any one of the apparatus, to provide a power supply system and performs control so that the voltage of said power storage device to the outside of degradation voltage range.

  According to such a configuration, a power generation device that generates power using natural energy, a power storage device that stores power, a load device that is supplied with power, and the power generation device, the power storage device, and the load device are controlled. A plurality of independent power supply type devices including a control device are connected in parallel, and each control device is connected to a central control means. The central control means monitors the voltage value of each power storage device based on the operation information received from each control device of each independent power supply type device, and the degraded battery range where the voltage value of the power storage device has a high deterioration rate of battery performance The power generator in the same independent power source device as the power storage device in the deteriorated battery range, the power generator in the other independent power source device, and the other power source in the other independent power source device. At least one of the power storage devices is selected, and control is performed so that the voltage of the power storage device is out of the deterioration voltage range.

As described above, since the operation information of each control device is collected in the central control means, it is possible to quickly grasp the operation state of a plurality of independent power supply devices and to quickly select a device that supplies power. Become.
In addition, by controlling the voltage of the power storage device to a value outside the deterioration voltage range, it is possible to control the power storage device to be within a voltage range where the deterioration rate of the performance of the power storage device is low.
In addition, the operation information of the independent power source device is, for example, charging information that is information on the charging status of the power storage device, power generation information that is information on the operating status of the power generating device, and load information that is information on the operating status of the load device. It is.

  In the power supply system, the central control unit is configured to generate a power generator in the same independent power source device as the power storage device, a power generator in another independent power source device, and another independent power source device based on the operation information. It is good also as supplying electric power to the said electrical storage apparatus from the apparatus with at least any one surplus electric power among the electrical storage apparatuses in the inside.

  Thus, the central control means selects a device with surplus power based on the operation information of each independent power supply type device received from the control device, and supplies power to the power storage device within the degradation voltage range. Surplus power can be used effectively.

  In the power supply system, the central control unit receives power from an independent power supply type device having a power storage device that needs to be discharged, and supplies power to the independent power supply type device that has a power storage device that needs to be charged. A power storage device in the same independent power supply type device as that of the power storage device, a power generation device in another independent power supply type device, At least one of the power storage device in the independent power source device and the central power storage unit may be selected, and control may be performed so that the voltage of the power storage device is out of the deterioration voltage range.

  According to such a configuration, the central control means receives power from the independent power supply type device having the power storage device that needs to be discharged, and supplies power to the independent power supply type device that has the power storage device that needs to be charged. Since the central power storage means to supply is provided, for example, when there is a power storage device that needs to be charged, it is possible to supply the shortage of power from the central power storage device. Thereby, electric power can be easily secured.

  The present invention provides a power generation device that generates power using natural energy, a power storage device that stores electric power, a load device that is supplied with electric power, and a control that controls the power generation device, the power storage device, and the load device, respectively. A power supply method for a power supply system comprising a plurality of independent power supply devices connected in parallel, wherein the voltage value of the power storage device in the same independent power supply device is within a degradation voltage range. And when it is determined that the voltage value is within the deterioration voltage range, the power generation device in the same independent power supply type device as the power storage device, the power generation device in another independent power supply type device, and other independent Provided is a power supply method for performing control so that at least one of power storage devices in a power supply type device is selected and the voltage of the power storage device is out of a deterioration voltage range.

  The present invention provides a power generation device that generates power using natural energy, a power storage device that stores electric power, a load device that is supplied with electric power, and a control that controls the power generation device, the power storage device, and the load device, respectively. A power supply method for a power supply system comprising a plurality of independent power supply type devices connected in parallel, each of the independent power supply devices based on operation information received from each of the control devices. When it is determined whether or not the voltage value of the power storage device in the power supply type device is within the deterioration voltage range, and it is determined that the voltage value is within the deterioration voltage range, the same independent power supply type device as the power storage device At least one of a power generation device in the power supply, a power generation device in another independent power supply type device, and a power storage device in another independent power supply type device, and the voltage of the power storage device is out of the degradation voltage range Like To provide a power supply method for performing a control.

  According to the present invention, there is an effect that the life of the secondary battery can be extended.

It is the block diagram which showed the outline of the electric power supply system which concerns on the 1st Embodiment of this invention. It is the figure which showed the relationship between an open circuit voltage and a capacity | capacitance fall rate. It is the block diagram which showed the outline of the electric power supply system which concerns on the 1st Embodiment of this invention. It is the block diagram which showed the outline of the electric power supply system which concerns on the 1st Embodiment of this invention. It is the block diagram which showed the outline of the electric power supply system which concerns on the 1st Embodiment of this invention. It is the block diagram which showed the outline of the electric power supply system which concerns on the 1st Embodiment of this invention. It is the block diagram which showed the outline of the electric power supply system which concerns on the 1st Embodiment of this invention. It is the block diagram which showed the outline of the electric power supply system which concerns on the 2nd Embodiment of this invention. It is the block diagram which showed the outline of the electric power supply system which concerns on the modification of the 2nd Embodiment of this invention.

  Hereinafter, embodiments of a power supply system according to the present invention will be described with reference to the drawings in the order of [First Embodiment] and [Second Embodiment].

[First Embodiment]
FIG. 1 is a block diagram showing a schematic configuration of a power supply system 10 according to the present embodiment. As shown in FIG. 1, the power supply system 10 according to this embodiment includes a plurality of independent power supply devices 20a and 20b as main components, and the independent power supply devices 20a and 20b are connected in parallel. It is said that. Since the independent power supply type devices 20a and 20b perform the same operation, the operation of the independent power supply type device 20a will be described as an example here.

  The independent power supply type device 20a includes a power generation device 30a that generates power by natural energy, a power storage device 31a that stores electric power obtained by the power generation device 30a, a load device 32a, and a surplus output discharge device 33a that discharges surplus voltage to the outside. And a control device 34a for controlling the state of charge of the power storage device as a main component. Similarly, the independent power supply type device 20b includes a power generation device 30b, a power storage device 31b, a load device 32b, a surplus output discharge device 33b, and a control device 34b as main components.

  The power storage devices 31a and 31b include, for example, a lithium ion secondary battery having a characteristic that the deterioration tendency varies depending on the battery voltage (charge rate), a measurement unit that measures battery states such as battery voltage and battery temperature, and a charge / discharge instruction. The charge / discharge control monitoring unit (not shown) that performs charge / discharge control when receiving the power is mainly configured.

The power generation devices 30a and 30b generate power using natural energy such as wind power and sunlight, and measure and monitor the generated power.
For example, the electric power obtained by the power generation device 30a is stored in the power storage device 31a of its own independent power supply type device 20a, supplied to the load device 32a, and stored in the power storage device 31b of the other independent power supply type device 20b.

  The load devices 32a and 32b are devices that consume power. For example, lighting equipment and lighting equipment.

The control devices 34a and 34b monitor information on the operation status of the power generation device, the power storage device, and the load device of its own independent power supply type device as operation information. The control device 34a is configured to be able to communicate with the control device 34b of the other independent power supply type device 20b. The control device 34a controls power transmission / reception between the independent power supply type devices.
For example, when the own power storage device 31a needs to be charged, the control device 34a sends the power storage device 31a to the power storage device 31a based on the own operation information and the operation information received from the control device 34b of the other independent power supply type device 20b. Select a device to supply power. In addition, the control device 34a controls power transmission / reception between the independent power supply type devices so as to supply the power of the selected device to the power storage device 31a.

Next, more specific control of the control device 34a will be described.
In FIG. 2, the horizontal axis indicates the open circuit voltage, and the vertical axis indicates the capacity reduction rate. FIG. 2 is a graph showing the trends in open circuit voltage and capacity reduction rate at room temperature.
As shown in FIG. 2, the range where the open circuit voltage of the power storage device is A and C is a deteriorated voltage range in which the performance of the power storage device deteriorates.
The control device 34a determines whether or not the voltage value of its own power storage device 31a is A or C within the above-described deterioration voltage range. If the result of determination is A or C within the degradation voltage range, control is performed so that B or D is outside the degradation voltage range. As a result of the determination, if the voltage value of its own power storage device 31a is out of the deterioration voltage range, nothing is done.

  Further, when the power storage device 31a within the deterioration voltage range is outside the deterioration voltage range, the control device 34a generates the power generation device 30a within the same independent power supply type device 20a, the power generation device 30b within the other independent power supply type device 20b, At least one of the power storage devices 31b in the other independent power supply type device 30b is selected, and the power of the selected device is supplied to the power storage device 31a.

Here, a method in which the control device 34a selects a device that supplies power to the power storage device 31a will be described.
First, the control device 34a determines whether or not the power generation device 30a of the same independent power supply type device 20a can supply power to the power storage device 31a. Specifically, as shown in FIG. 3, when the load device 32a is stopped or the load device 32a is operating, it is determined whether or not there is surplus power in the power generation device 30a. When there is surplus power, the control device 34a determines that the power generation device 30a can supply power, and selects the power generation device 30a.

  Secondly, when the power generation device 30a cannot supply power, the control device 34a notifies the control device 34b of the other independent power supply type device 20b of a request for power supply. The control device 34b that has received the notification of the power supply request determines whether or not the power supply is possible from the power generation device 30b of the independent power supply type device 20b. As shown in FIG. 4, when the load device 32b of the independent power supply type device 20b is stopped and the power storage device 31b is out of the deterioration voltage range, it is determined that power can be supplied, and the control device 34b generates power. The device 30b is selected. Furthermore, the control device 34b notifies the control device 34a that power can be supplied, and supplies the power of the power generation device 30b to the power storage device 31a.

  Further, as shown in FIG. 5, even when the load device 32b of the independent power supply type device 20b is operating, if the power storage device 31b is out of the deterioration voltage range and there is surplus power in the power generation device 30b, power generation is performed. The device 30b may be selected. In this case, the control device 34b notifies the control device 34a that power can be supplied and supplies the power of the selected power generation device 30b to the power storage device 31a.

  Third, when the power generation device 30b cannot supply power, the control device 34b determines whether power can be supplied from the power storage device 31b. As shown in FIG. 6, the control device 34b determines that power can be supplied from the power storage device 31b when the load device 32b of the independent power source device 20b is stopped and the power storage device 31b can be discharged. The power storage device 31b is selected. In this case, control device 34b notifies control device 34a that power can be supplied, and supplies power from power storage device 31b to power storage device 31a.

  Further, as shown in FIG. 7, even when the load device 32b of the independent power supply type device 20b is operating, if the power storage device 31b can be discharged, it is determined that power can be supplied from the power storage device 31b. Then, the control device 34b may select the power storage device 31b. In this case, the control device 34b notifies the control device 34a that power can be supplied and supplies the power of the selected power storage device 31b to the power storage device 31a.

  When the power supply from the power generation device 30b and the power storage device 31b is impossible, the control device 34b notifies the control device 34a that power cannot be supplied.

  As described above, the control devices 34a and 34b select a device that supplies power to the power storage device 31a having a voltage value within the deterioration voltage range, and use the power of the selected device to remove the power storage device 31a from the deterioration voltage range. Control to set the voltage value to.

  In addition, in the power supply system according to the present embodiment, when a device that supplies power to the power storage device within the degradation voltage range is selected from other independent power supply devices, the power generation device in the other independent power supply devices It is determined whether or not it is possible to supply, and if it is not possible, it is subsequently determined whether or not the power storage device can supply power. However, the determination order is not limited. For example, it may be determined whether or not the power storage device can supply power, and when power supply by the power storage device is impossible, it may be determined whether or not the power generation device can supply power.

Next, the operation of the power supply system 10 according to the present embodiment will be described.
When the load device 32a of the independent power supply type device 20a of the power supply system 10 is stopped, the control device 34a determines whether or not the voltage value of the power storage device 31a is within the deterioration voltage range. As a result of the determination, if the voltage is within the deterioration voltage range, the voltage value of the power storage device 31a is controlled to be outside the deterioration voltage range. If the result of determination is outside the degraded voltage range, nothing is done.

  In the previous stage, when it is determined that the power storage device 31a is within the deterioration voltage range, the control device 34a determines whether or not power can be supplied from the power generation device 30a of the independent power source device 20a. As a result of the determination, when it is determined that power can be supplied, the power of the power generation device 30a is supplied to the power storage device 31a. As a result of the determination, if it is determined that power supply is impossible, the control device 34a notifies the control device 34b of the other independent power supply type device 20b of a request for power supply.

  Subsequently, in the control device 34b that has received the notification of the power supply request, it is determined whether or not power can be supplied from the power generation device 30b. As a result of the determination, if it is possible, the control device 34b notifies the control device 34a that power can be supplied, and supplies the power of the power generation device 30b to the power storage device 31a. As a result of the determination, if it is determined that power supply is not possible, the control device 34b determines whether the power of the power storage device 31b can be supplied. As a result of the determination, if it is possible, the control device 34b notifies the control device 34a that power can be supplied, and the power of the power storage device 31b is supplied to the power storage device 31a. If it is impossible, the control device 34b notifies the control device 34a that power cannot be supplied.

  As described above, according to the power supply system of the present embodiment, a plurality of independent power supply type devices including a power generation device, a power storage device, a load device, and a control device are connected in parallel, and each control device is independent. It is determined whether or not the voltage range of the power storage device of the power supply type device is in the degradation voltage range A or C with a high performance degradation rate. When the voltage of the power storage device is within the range A or C where the performance deterioration rate is high, the charge amount is controlled so as to be B or D outside the deterioration voltage range. In addition, when the power storage device needs to be charged, the power generation device in its own independent power supply device, the power generation device in another independent power supply device, and the power storage device in another independent power supply type device Charging is performed from any one device. As a result, when the power storage device 31a needs to be charged, the shortage of power can be supplied also from other independent power supply type devices, and the power can be easily secured.

  In addition, when there is surplus generated power in the device alone, surplus power can be effectively used without being discarded by supplying it to another independent power supply type device. In addition, since the entire independent power supply type device connected in parallel can be regarded as one large power generation unit and power storage unit, the operation of loads (for example, lighting period, illuminance, etc.) of the plurality of devices is uniform. It can be made.

  Further, by performing control so that the voltage value of the power storage device is outside the deterioration voltage range, deterioration of the power storage device can be suppressed.

  In the power supply system according to the present embodiment, the configuration in which two independent power supply devices are connected has been described as an example. However, the configuration is not limited thereto, and the number of connection of the independent power supply devices is not particularly limited.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The power supply system of this embodiment is different from that of the first embodiment in that a central control unit (central control means) that collects operation information of each independent power supply type device and controls power transmission and reception between the independent power supply type devices. It is a point to provide. Hereinafter, regarding the power supply system of the present embodiment, description of points that are common to the first embodiment will be omitted, and different points will be mainly described. Further, since the independent power supply devices 20a and 20b perform the same operation, the operation of the independent power supply device 20a will be described as an example here.

As shown in FIG. 8, the power supply system 10 ′ according to the present embodiment includes a plurality of independent power supply devices 20 a and 20 b and a central control unit 50 as main components.
The central control unit 50 is communicably connected to the control devices 34a and 34b of the independent power type devices 20a and 20b. The central control unit 50 determines the voltage values of the power storage devices 31a and 31b in the independent power supply devices 20a and 20b based on the operation information of the independent power supply devices 20a and 20b received from the control devices 34a and 34b. It is determined whether or not it is within the deterioration voltage range.

  As a result of the determination, when the voltage values of the power storage devices 31a and 31b are within the deterioration voltage range, the central control unit 50 is outside the deterioration voltage range based on the operation information from each independent power supply type device. Take control. Specifically, when the power storage device 31a is within the deterioration voltage range, the central control unit 50 generates the power generation device 30a in the same independent power supply type device as the power storage device 31a, and the power generation device 30b in another independent power supply type device. In addition, at least one of the power storage devices 31b in the other independent power supply type devices is selected, and control is performed to supply the power of the selected device to the power storage device 31a. The “at least one device” may be a device with surplus power.

  As described above, the central control unit 50 collects the operation information of the control devices 34a and 34b. Thereby, while being able to grasp | ascertain rapidly the operating state of the several independent power supply device 20a, 20b in electric power supply system 10 ', the apparatus which needs electric power supply, and the apparatus used as the electric power supply source can be selected rapidly. It becomes possible.

[Modification]
In the power supply system according to the present embodiment, when the central control unit 50 selects a device as a power supply source, the power generation device 30a in the same independent power supply type device, the power generation device in another independent power supply type device. The selection is made from at least one of 30b and the power storage device 31b in another independent power supply type device, but is not limited thereto.

For example, as shown in FIG. 9, the central control unit 50 charges the power that is surplus between the independent power supply type devices, and discharges when there is no surplus power between the independent power supply type devices. (Central power storage means) 60 may be provided, and the central power storage unit 60 may be selected as a power supply apparatus.
Thus, since the central control unit 50 includes the central power storage unit 60, it is possible to easily secure the power to be supplied to the independent power supply type device in which power shortage has occurred. Moreover, since the central electrical storage part 60 can charge the surplus electric power between independent power supply type | mold apparatuses, the waste which discards electric power can be reduced.

10, 10 'Power supply system 20a, 20b Independent power supply type device 30a, 30b Power generation device 31a, 31b Power storage device 32a, 32b Load device 33a, 33b Surplus output discharge device 34a, 34b Control device 50 Central control unit 60 Central power storage unit

Claims (7)

A power generation device that generates power using natural energy, a power storage device that stores power, a load device that is supplied with power, and a control device that controls the power generation device, the power storage device, and the load device, respectively. A power supply system comprising a plurality of independent power supply type devices connected in parallel,
The control device of one independent power supply type device is configured to be able to communicate with the control device of another independent power supply type device,
When it is determined whether or not the voltage value of the power storage device in the same independent power supply type device is within the deterioration voltage range, and it is determined that the voltage value is within the deterioration voltage range, the same independent as the power storage device At least one of a power generation device in a power supply type device, a power generation device in another independent power supply type device, and a power storage device in another independent power supply type device is selected, and the voltage of the power storage device is degraded. A power supply system that performs control so as to be outside a voltage range.   The said control apparatus selects the apparatus which supplies electric power to the said electrical storage apparatus based on the operation information of each independent power supply apparatus received from the said control apparatus of another independent power supply apparatus. The power supply system according to 1. A power generation device that generates power using natural energy, a power storage device that stores power, a load device that is supplied with power, and a control device that controls the power generation device, the power storage device, and the load device, respectively. A power supply system comprising a plurality of independent power supply type devices connected in parallel,
Central control means communicably connected to the control device of each independent power supply type device,
The central control means includes
Based on the operation information of each independent power supply device received from each control device, determine whether or not the voltage value of the power storage device in each independent power supply device is within a deterioration voltage range,
When it is determined that the voltage value is within the deterioration voltage range, the power generation device in the same independent power supply type device as the power storage device, the power generation device in another independent power supply type device, and the other independent power supply type device A power supply system comprising: selecting at least one of the power storage devices and performing control so that the voltage of the power storage device is out of a deterioration voltage range.   Based on the operation information, the central control means includes a power generation device in the same independent power supply type device as the power storage device, a power generation device in another independent power supply type device, and a power storage device in another independent power supply type device. The power supply system according to claim 3, wherein power is supplied to the power storage device from at least one device having surplus power. The central control means includes
Comprising a central power storage means for receiving power from an independent power source device having a power storage device that needs to be discharged and supplying power to the independent power source device having a power storage device that needs to be charged;
When it is determined that the voltage value is within the deterioration voltage range, the power generation device in the same independent power supply type device as the power storage device, the power generation device in another independent power supply type device, the power storage in another independent power supply type device 4. The power supply system according to claim 3, wherein at least one of the device and the central power storage unit is selected, and control is performed so that the voltage of the power storage device is out of a deterioration voltage range. . A power generation device that generates power using natural energy, a power storage device that stores power, a load device that is supplied with power, and a control device that controls the power generation device, the power storage device, and the load device, respectively. A power supply method for a power supply system in which a plurality of independent power supply devices are connected in parallel,
When it is determined whether or not the voltage value of the power storage device in the same independent power supply type device is within the deterioration voltage range, and it is determined that the voltage value is within the deterioration voltage range, the same independent as the power storage device At least one of a power generation device in a power supply type device, a power generation device in another independent power supply type device, and a power storage device in another independent power supply type device is selected, and the voltage of the power storage device is degraded. A power supply method for performing control so as to be outside the voltage range. A power generation device that generates power using natural energy, a power storage device that stores power, a load device that is supplied with power, and a control device that controls the power generation device, the power storage device, and the load device, respectively. A power supply method for a power supply system in which a plurality of independent power supply devices are connected in parallel,
Based on the operation information of each independent power supply device received from each control device, determine whether or not the voltage value of the power storage device in each independent power supply device is within a deterioration voltage range,
When it is determined that the voltage value is within the deterioration voltage range, the power generation device in the same independent power supply type device as the power storage device, the power generation device in another independent power supply type device, and the other independent power supply type device A power supply method for selecting at least one of the power storage devices and performing control so that the voltage of the power storage device is out of a deterioration voltage range.

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