JP2021132494A - Charging/discharging control device, charging/discharging control system and charging/discharging control method - Google Patents

Abstract

To provide a charging/discharging control device, a charging/discharging control system and a charging/discharging control method that perform charging/discharging control over a storage battery while taking kinds of meteorological information or alerts into consideration.SOLUTION: A charging/discharging control device 16 provided in a charging/discharging control system 10 comprises: a charging/discharging control unit 16C which controls charging and discharging of a power storage unit; a meteorological information acquisition unit 16W which acquires one or more pieces of disaster prevention information from outside; a hold time determination unit 16T determining a hold time that enables continuous supply of electric power from the power storage unit to a load; and a minimum held remaining amount derivation unit 16R which derives, based upon an electric power load predicted during the determined hold time, a minimum held remaining amount that the power storage unit should hold. The hold time determination unit determines a hold time according to at least any of a kind of disaster prevention meteorological information and a degree of alert, and the charging/discharging control unit refers, when acquiring the disaster prevention meteorological information, to the derived minimum held remaining amount to control charging and discharging of the power storage unit.SELECTED DRAWING: Figure 1

Description

The present invention relates to a charge / discharge control device, a charge / discharge control system, and a charge / discharge control method. Regarding the discharge control method.

In a system that charges a storage battery with electric power generated using natural energy and electric power supplied from an electric power system, charging / discharging control of the storage battery is performed in any of the economical mode, clean mode, and charging mode. It is usually done. The contents of the three modes are as follows. There are some differences in how each mode is called depending on the operator.
In the economical mode, the storage battery is charged as much as possible during the nighttime when the unit price of the grid power is low, and the energy stored in the storage battery is discharged during the purchase of power at other times when the unit price is high.
In the clean mode, the amount of power supplied from the grid power is suppressed as much as possible by charging the storage battery with the surplus power of the photovoltaic power generation and discharging it during the purchase.

In the charging mode, the storage battery is preferentially charged in preparation for a power failure of the system power due to a disaster or the like. However, the storage battery 13 is not always charged to the full capacity, and the storage battery 13 is charged until the target remaining amount of the storage battery is reached. That is, the charging target is not always full capacity.
With respect to the charging mode, information indicating a sign of power failure is acquired, the urgency indicating how urgently the storage battery needs to be charged is calculated based on the sign, and the storage battery is charged according to the calculated urgency. A technique for controlling either control or discharge permission control is known (see, for example, Patent Document 1).
The above-mentioned signs of power failure include signs of meteorological disasters and earthquake disasters, information indicating signs of meteorological disasters includes typhoon information and thunderstorm information, and information indicating signs of earthquake disasters includes earthquake information. There is.

In addition, regarding the control of the storage battery in consideration of the weather information in the charging mode, the control is started in the weather information correspondence mode according to the acquired weather information, including the weather information correspondence mode in which the charge / discharge control of the storage battery is performed according to the weather information. After that, there is known a control device that switches from the control in the weather information correspondence mode to the control in another mode when the weather information is not acquired for a predetermined period (see, for example, Patent Document 2).
In addition, although it is not linked with weather information, in relation to charge / discharge control of the power storage device (storage battery), the power storage device has the minimum retained power stored in advance, and the value of the minimum retained capacity is set. There is known a power supply system that puts the power storage device in a discharge stop state when the power is changed to a value higher than the measured remaining amount of the power storage device.

Japanese Unexamined Patent Publication No. 2012-235541 Japanese Unexamined Patent Publication No. 2016-220334 Japanese Unexamined Patent Publication No. 2014-121153

When a power outage occurs in the power system due to severe weather conditions, consumers expect that the storage battery will supply power to the power load (hereinafter simply referred to as the load) for the entire period during the power outage. Therefore, it is not affected by the power outage. The amount of power to be supplied from the storage battery to the load during a power outage depends on the magnitude of the load during the power outage and the time length of the power outage.

In addition, for example, the meteorological information released by the Japan Meteorological Agency includes information on various meteorological conditions such as heavy rain, heavy snow, and storms, and for each type of meteorological information, special warnings, warnings, and warnings are issued according to the degree of alertness. It will be announced.
The present invention has been made in consideration of the above circumstances, and provides a method for appropriately controlling the charge and discharge of a storage battery in consideration of the type of weather information or caution.

The present invention provides a charge / discharge control unit that controls charging / discharging of a power storage device, a weather information acquisition unit that acquires one or more disaster prevention weather information from the outside, and a power storage device that can continuously supply power to a load. A holding time determining unit that determines the holding time to be held, and a minimum holding remaining amount deriving unit that derives the minimum holding remaining amount to be held by the power storage device based on the power load predicted during the determined holding time. In preparation, the holding time determination unit determines the holding time according to at least one of the type or alertness of the disaster prevention weather information, and the charge / discharge control unit derives the disaster prevention weather information when it is acquired. Provided is a charge / discharge control device for controlling charge / discharge of the power storage device with reference to the minimum retained remaining amount.

Further, the present invention provides a charge / discharge control system including the charge / discharge control device and a power storage device controlled by the charge / discharge control device.

Further, from different viewpoints, the present invention includes a step of acquiring one or more types of weather information from the outside and a step of determining a minimum holding time for allowing the power storage device to supply electric power to the load as steps executed by the computer. , The step of deriving the minimum retained amount to be retained by the power storage device based on the power load predicted during the determined minimum holding time, and the stored amount with reference to the derived minimum holding amount. A charge / discharge control method including a step of controlling charge / discharge of an apparatus is provided.

The charge / discharge control device according to the present invention can control the charge / discharge of a storage battery suitable for the type of weather information and the degree of alertness.
The charge / discharge control system and the charge / discharge control method according to the present invention also have the same effect.

It is a block diagram which shows the structure of the charge / discharge control system including the charge / discharge control device by this embodiment. It is explanatory drawing which shows an example of the meteorological cooperation setting screen which concerns on charge / discharge control, which is displayed on the operation unit shown in FIG. It is explanatory drawing which shows an example of charge / discharge control by the charge / discharge control apparatus shown in FIG. It is explanatory drawing which shows the state transition example of the charge / discharge control performed by the charge / discharge control part shown in FIG. This is the first part of the flowchart showing an example of charge / discharge control executed by the charge / discharge control unit of the charge / discharge control device shown in FIG. This is the second part of the flowchart showing an example of charge / discharge control executed by the charge / discharge control unit of the charge / discharge control device shown in FIG. This is the third part of the flowchart showing an example of charge / discharge control executed by the charge / discharge control unit of the charge / discharge control device shown in FIG. This is the fourth part of the flowchart showing an example of charge / discharge control executed by the charge / discharge control unit of the charge / discharge control device shown in FIG. FIG. 6 is an explanatory diagram showing an example of charge / discharge control of a plurality of storage batteries that can be individually charged / discharged in the sixth embodiment. In the eighth embodiment, it is a state transition diagram showing the relationship between charge / discharge control of a storage battery as a virtual plant, lightning warning ream, and weather information linkage.

Hereinafter, the present invention will be described in more detail with reference to the drawings. It should be noted that the following description is exemplary in all respects and should not be construed as limiting the invention.
(Embodiment 1)
<< Configuration of charge / discharge control device and charge / discharge control system >>
The configuration of the charge / discharge control system including the charge / discharge control device according to this embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a charge / discharge control system 10 including a charge / discharge control device 16 according to this embodiment. Note that FIG. 1 shows an example in which the charge / discharge control system 10 is installed in a detached house, but the installation location of the charge / discharge control system is not limited to this. Further, in FIG. 1, the grid power network 21 and the HEMS (Home Energy Management System) server 22 are also shown together with the charge / discharge control system 10.

The charge / discharge control system 10 according to this embodiment is a system in which a consumer is provided with a power generation device and a storage battery using natural energy. More specifically, it is mainly composed of a solar cell module 11, a storage battery 13, and a charge / discharge control device 16 that generate electricity by using solar energy, which is an aspect of natural energy. The power generation device using natural energy is not limited to the solar cell module 11. For example, it may be wind power generation, biomass power generation, or the like, or a combination thereof. The charge / discharge control system 10 includes not only a configuration related to power generation and storage, but also a configuration for presenting the power generation status to the consumer and acquiring information necessary for the operation of the charge / discharge control system 10 from the outside. good.

The charge / discharge control system 10 shown in FIG. 1 includes a solar cell module 11, a power conditioner 12, a storage battery 13, a distribution board 14, a smart meter 15, a charge / discharge control device 16, a communication interface circuit 17, and an operation unit 18. ..
The solar cell module 11 is a module that converts the light energy of sunlight into electric energy.
The power conditioner 12 is a device that converts the generated electric power so that it can be consumed by a load. Specifically, the power conditioner 12 converts the direct current output by the solar cell module 11 into an alternating current.

The storage battery 13 is a power storage device that stores electric energy, and stores the electric energy generated by the solar cell module 11 or the electric energy supplied from the grid power grid 21.
Although not shown in FIG. 1, the charge / discharge control system 10 may include another power generation device (for example, a fuel cell that generates power by using fuel gas). When the charge / discharge control device 16 includes another power generation device, it is possible to perform charge / discharge control in consideration of the power generation amount of the other power generation device by detecting and acquiring the power generation amount of the other power generation device, for example. become.

The distribution board 14 collects the electric power drawn from the grid power grid 21 via the smart meter 15 and the electric power of the solar cell module 11 and the storage battery 13, and distributes the collected electric power to indoor electric devices (not shown).
The smart meter 15 is a digital integrated power meter that measures the amount of power used by a consumer (supply and demand contractor) and transmits it to a power generation company or a grid operator.

The charge / discharge control device 16 acquires power information related to power generation of the charge / discharge control system 10 and controls the operation of the power conditioner 12 according to the power information. Examples of the electric power information include information indicating whether or not commercial electric power is purchased, information indicating the generated electric power of the solar cell module 11, information indicating the charging power or discharging power of the storage battery 13, and the like.
Whether or not commercial power is purchased and the amount of power purchased can be specified from the output value of the sensor by connecting a sensor to the power line connecting the smart meter 15 and the grid power network 21. Further, information indicating the generated power of the solar cell module 11 and the charge / discharge power of the storage battery 13 can be acquired via the power conditioner 12.
Further, since the storage battery 13 is connected to the power conditioner 12, the charge / discharge control device 16 can control charging / discharging of the storage battery 13 via the power conditioner 12.

The charge / discharge control device 16 in this embodiment is mainly composed of a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) and a memory from the viewpoint of hardware configuration. Then, the function related to charge / discharge control is realized by executing the processing program stored in the memory by the CPU or MPU (hereinafter, collectively referred to as CPU). Further, it includes an input / output circuit for controlling the power conditioner 12, the communication interface circuit 17, and the like.
Further, from the viewpoint of functional configuration, the weather information acquisition unit 16W, the minimum holding time determination unit 16T, the minimum holding remaining amount derivation unit 16R, and the charge / discharge control unit 16C are included.

The weather information acquisition unit 16W acquires weather information from an external server connected via a communication interface circuit 17, which will be described later, and which provides weather information. Here, the meteorological information is, for example, disaster prevention meteorological information announced by the Japan Meteorological Agency, and types such as special warnings, warnings, and warnings are set for each category such as lightning strikes, heavy rains, and storms. However, since it is difficult to predict lightning strikes with high accuracy, special warnings and warnings are not provided, only warnings are provided. Weather information is updated from time to time. The weather information acquisition unit 16W sequentially accesses the server that provides the weather information and acquires the updated weather information. As an example, the weather information acquisition unit 16W accesses the server at intervals of about 15 minutes to acquire weather information.

The holding time determination unit 16T determines how long the charge / discharge control system 10 will continue to supply power to the load when a special alarm, alarm or warning is issued, for at least how long from the present time.
The charge / discharge control unit 16C cuts off the power supply from the grid power grid 21 in the case of severe weather conditions such as the above-mentioned special warnings, warnings, and warnings, that is, the worst situation of a power failure. Assumed as. Therefore, even if a power failure occurs, the charging / discharging of the storage battery 13 is controlled so that the power can be continuously supplied to the load from the energy stored in the storage battery 13 for at least N hours (the time determined by the holding time determining unit 16T). , The necessary electric power is stored in the storage battery 13. However, if the amount of power generated by a power generation device using natural energy such as the solar cell module 11 can be expected under the predicted meteorological conditions, the amount of power generation may be deducted. On the other hand, if the weather conditions are mild and no special warnings, warnings, or warnings have been issued, the charge / discharge control unit 16C prioritizes power saving, assuming that the probability of a power outage due to the weather conditions is low. The power stored in the storage battery 13 is controlled to be supplied to the load. The period during which the storage battery 13 can supply electric power to the load depends on the magnitude of the load during that period.

Therefore, the minimum holding remaining amount derivation unit 16R predicts the amount of power consumed by the load from the present time until the minimum holding time elapses in response to the issuance of special alarms, alarms, warnings, and the like. Then, the amount of power corresponding to the predicted amount of power is derived as the target amount of power to be stored in the storage battery 13. In other words, the current time, the N for the time when the storage battery 13 can continue to supply power to the load after the power failure occurs, and the prediction of the power consumption are input to the minimum retained remaining amount derivation unit 16R, and the N The required capacity of the storage battery that can cover the time consumption is calculated.
The charge / discharge control unit 16C controls the charge / discharge of the storage battery 13 so that the target electric energy derived by the minimum holding remaining amount derivation unit 16R is stored in the storage battery 13. In the charge / discharge control system 10 of FIG. 1, the storage battery 13 is charged by electric power supplied from at least one of the solar cell module 11 and the grid power grid 21.

Further, in this embodiment, the charge / discharge control device 16 performs information management related to the charge / discharge control system 10 and processing related to communication with the outside. Specifically, the charge / discharge control device 16 transmits the acquired power information to an information management server (not shown) of the power generation company or the grid operator. Further, the charge / discharge control device 16 acquires each of the above-mentioned information necessary for operation from the information management server of the power generation company or the grid operator.

The communication interface circuit 17 is a device that connects the charge / discharge control device 16 to the network NW. Further, in FIG. 1, the communication interface circuit 17 constitutes a local area network in the customer's home and communicates and connects the local area network with the network NW (for example, the Internet) outside the home. Although not shown in FIG. 1, various devices are connected to the local area network in the house as a load that consumes power of air conditioners (so-called air conditioners, air purifiers, etc.), televisions, cooking appliances, and the like. May be good. This makes it possible for the consumer to check the operating state of each device or to control the operation of each device via the local area network in the house. Further, a data transmitter for transmitting sensing information such as a detected value of electric power or current supplied to each device or room temperature may be connected. In this case, the power consumption of the equipment in the house can be presented to the consumer.

In this embodiment, the operation unit 18 includes a mobile communication terminal having a communication function and an information output function. The consumer of the charge / discharge control system 10 uses the operation unit 18 to check the power generation status of the charge / discharge control system 10 and set the value of the minimum retained amount and the value of the minimum retained amount at the time of request. be able to.
More specifically, the operation unit 18 is preferably composed of a smartphone, a tablet terminal, or the like, but is not limited to these mobile communication terminals, and may be a stationary terminal device such as a personal computer. The operation unit 18 communicates via a local area network or a network NW outside the home. In the case of a mobile communication terminal, it is assumed that the communication is performed wirelessly, but in the case of a stationary terminal device, wired communication may be used.

FIG. 2 is an explanatory diagram showing an example of a weather cooperation setting screen displayed on the operation unit 18. The operation unit 18 shown in FIG. 2 is a mobile communication terminal. In the weather cooperation setting screen 19 shown in FIG. 2, a setting display area 19a for displaying the currently selected weather cooperation function is arranged at the uppermost part.
In the example of FIG. 2, it is displayed in the setting display area 19a that the functions of the weather information linkage and the lightning warning linkage are selected. Each function of the weather information linkage and the lightning warning linkage can be selected and canceled by the user with the setting items described later in the weather linkage setting screen 19. A home icon is arranged at the right end of the setting display area 19a. When the home icon is touched, the weather cooperation setting screen shown in FIG. 2 transitions to a home screen (not shown).

The area setting 19b is arranged below the setting display area 19a. The area setting 19b is a screen on which the weather information acquisition unit 16W sets an area for which the weather information should be acquired. This item sets the area where the charge / discharge control system 10 is installed. In the example of FIG. 2, the regional setting is accepted by the zip code.
The weather information linkage setting 19c is arranged under the area setting 19b. The weather information linkage setting 19c accepts individual selections of weather information for which warnings and special warnings are issued. In the example of FIG. 2, selections are individually accepted for various weather information such as storms, blizzards, heavy rains, floods, storm surges, heavy snowfalls, and waves. In addition, regarding the alert level of the selected weather information, the selection of the alert level such as whether to target only the special warning or the special warning and the warning is accepted. Furthermore, apart from the selection of individual weather information, the selection of whether to enable or disable the weather information linkage function is accepted.

By the way, lightning strikes are prone to power outages, but no warnings or special warnings are issued for lightning. Therefore, the lightning warning linkage setting 19d is arranged under the weather information linkage setting 19c.
The lightning warning linkage setting 19d accepts a selection of whether to enable or disable the lightning warning linkage function in addition to the above-mentioned weather information linkage function. In the example shown in FIG. 2, for each weather information of storm, blizzard, heavy rain, flood, storm surge, heavy snow, and wave related to the weather information linkage setting 19c, only warnings and special warnings with a higher degree of caution than warnings are set. There is. As a modification, a warning may also be selected.

The minimum holding time setting 19e is arranged under the lightning warning cooperation setting 19d. The minimum holding time setting 19e is a holding time setting that enables continuous power supply from the storage battery 13 to the load even if a power failure occurs when the lightning warning linkage function is enabled and the lightning warning is issued. Accept. The holding time is a target value for charge / discharge control.

In the example shown in FIG. 2, the holding time determination unit 16T determines the setting accepted by the holding time setting 19e as the holding time. In the example of FIG. 2, the setting of the holding time is related to the lightning warning cooperation. For weather information linkage, a predetermined holding time is applied, and user settings are not accepted. However, not limited to this aspect, the weather information linkage setting 19c may separately accept the setting of the holding time as in the holding time setting 19e. Further, for example, the holding time may be set according to the alert level according to the type of weather information and the difference between the warning and the special warning. Further, the setting of the minimum holding time may be accepted for each type of weather information, and they may be combined.
Further, in the example shown in FIG. 2, the unit for setting the guideline holding time is time, but the unit is not limited to this. For example, it may be in half-hour units, 15-minute units, or 10-minute units.

Two operation buttons 19f are arranged under the minimum holding time setting 19e. When the operation of the "set" button is accepted, the charge / discharge control device 16 determines the setting contents from the area setting 19b to the minimum holding time setting 19e shown on the weather cooperation setting screen 19 of FIG. 2 to perform charge / discharge control. To execute.
On the other hand, when the operation of the "Cancel" button is accepted, the weather cooperation setting screen 19 is returned to the current setting content without confirming the setting content.
The above is the description of the weather cooperation setting screen 19 of FIG.

As described above, in this embodiment, the minimum remaining capacity of the appropriate storage battery based on the weather information can be presented in a manner that is easy for the user to understand, or the setting can be accepted in a manner that is easy for the user to understand. The amount of power to be supplied from the storage battery to the load during a power outage depends on the size of the load during the power outage and the time length of the power outage. It's not easy to do. However, if errors are tolerated, predictions can be made based on history. It can be said that the length of a power outage and the magnitude of the load during a power outage are parameters that ordinary consumers usually do not notice. It is not easy for the user to confirm or set the minimum remaining capacity of the appropriate storage battery based on those parameters. In this embodiment, the user can easily set an appropriate minimum holding amount of the storage battery based on the weather information by setting the minimum holding time setting 19e.

In this embodiment, the charge / discharge control system 10 is connected to an external system power grid 21. Further, the charge / discharge control system 10 is connected to the HEMS server 22 via the network NW.
The grid power grid 21 is a power grid that supplies power to power consuming equipment, and is provided by a power generation company, a grid operator, or the like. This power supply is usually paid (purchased). On the contrary, the electric power generated by the charge / discharge control system 10 can be supplied to the grid power grid 21 (reverse power flow), and the electric power can be purchased by a power generation company, a grid operator, or the like (power sale).
The HEMS server 22 is a server that acquires and manages power information of the charge / discharge control system 10. The consumer can access the HEMS server 22 with the operation unit 18 and check the power generation status and the like.

≪Charging / discharging control of storage battery based on weather information≫
Subsequently, an example of charge / discharge control by the charge / discharge control device 16 shown in FIG. 1 will be described. FIG. 3 is an explanatory diagram showing an example of charge / discharge control by the charge / discharge control device 16. The charge / discharge control in FIG. 3 illustrates a case where the lightning warning linkage function is functioning and the weather information linkage function is not functioning.
In FIG. 3, the X-axis shows the passage of time. Specifically, it shows the time from 7:00 am to 22:00 pm. A lightning warning is issued from 10:00 to 22:00 on the same day. The curve of FIG. 3 shows the transition of the power consumption from 7:00 to 22:00, which is predicted based on the history. The Y-axis direction indicates the magnitude of power consumption (predicted value). Further, the remaining amount of the storage battery 13 at 7 o'clock, 10 o'clock and 19 o'clock is shown by an illustration.

The predicted value of power consumption is determined based on past performance. Similarities in meteorological conditions and seasonal patterns of power consumption may be considered to provide highly accurate forecasts.
The past results may be held and managed by the charge / discharge control device 16, but it is held and managed by an external device capable of communication, and the minimum holding remaining amount derivation unit 16R acquires it from the external device. May be good. In this embodiment, the HEMS server 22 holds and manages the past results, and the HEMS server 22 provides the predicted value of the acquired power consumption in response to the request from the minimum holding remaining amount derivation unit 16R.

The minimum holding remaining amount derivation unit 16R requests the HEMS server 22 for a predicted value of the power consumption in the period from the present time to the elapse of the reference holding time, for example. Alternatively, the minimum holding remaining amount deriving unit 16R may periodically acquire the predicted value for a longer period than the reference holding time. For example, it may be repeated to acquire the predicted values for today and the next day at a predetermined time on the previous day.
When the predicted value of the power consumption is acquired from the HEMS server 22, the minimum retained amount derivation unit 16R derives the stored amount enough to cover the power consumption up to 3 hours later as the minimum retained amount.

At 7 o'clock, the storage battery 13 is fully charged by nighttime power. At the same time, no lightning warning was issued. Even if a lightning warning has not been issued, the minimum retained capacity derivation unit 16R determines the minimum retained capacity so that the remaining capacity of the storage battery 13 does not fall below a predetermined value in case of an unexpected power failure. do. The minimum remaining capacity in this case is 20% of the total capacity of the storage battery 13 as shown in FIG. On the other hand, the remaining amount of the storage battery 13 at that time is assumed to be 100%.
As long as the remaining amount of the storage battery 13 exceeds 20% of the minimum holding remaining amount, the charge / discharge control unit 16C supplies the electric power stored in the storage battery 13 to the load. That is, as long as the remaining capacity of the storage battery 13 exceeds the minimum holding remaining amount, the charge / discharge control unit 16C controls to discharge the storage battery 13 during power purchase as in the economical mode or the clean mode. It should be noted that the operation unit 18 is set by the user on a setting screen (not shown) (a setting screen different from the weather cooperation setting screen 19 in FIG. 2) for charging / discharging in the same manner as in the economical mode or the clean mode. Shall be accepted.

In this embodiment, the minimum retained amount deriving unit 16R sequentially derives the minimum retained amount corresponding to the guideline holding time while the lightning warning is issued and the issued lightning warning continues. Then, the minimum retained amount is updated based on the derived value. The derivation time interval is, for example, 3 hours, which is the same as the minimum holding time. However, it is not limited to this. For example, the minimum retained amount may be derived and updated every hour, or every half hour. In addition, the weather information acquisition unit 16W sequentially accesses the server that provides the weather information to acquire the updated weather information. In one example, every 15 minutes. Therefore, the minimum retained amount may be derived and updated each time the weather information is acquired. In the following description, the minimum retained amount deriving unit 16R shall derive and update the minimum retained amount every 3 hours.

At 10 o'clock, 3 hours after 7 o'clock, the minimum retained amount deriving unit 16R derives the minimum retained amount again. At 10 o'clock, a lightning warning has just been issued. In response to the issuance of the lightning warning, the minimum retained amount derivation unit 16R sets the minimum retained amount commensurate with the predicted power consumption in the period from 10 o'clock when it is issued to 3 hours after the standard holding time. Ask. A value of 30% of the total capacity of the storage battery 13 is derived as the minimum holding amount corresponding to the obtained power consumption (predicted value) from 10:00 to 13:00 three hours later. Then, the setting of the minimum retained amount up to that point is updated to the derived minimum retained amount (see FIG. 3).

It is assumed that the remaining amount of the storage battery 13 at 10 o'clock is 60%. Since the remaining amount of the storage battery 13 exceeds the minimum holding remaining amount, the charge / discharge control unit 16C continues the control to discharge the storage battery 13 during the power purchase. The charge / discharge control unit 16C sequentially detects the remaining amount of the storage battery 13 and compares it with the minimum remaining amount. As an example, the charge / discharge control unit 16C detects the remaining amount of the storage battery 13 every 60 seconds. When the remaining amount of the storage battery 13 falls below the minimum holding remaining amount, the charge / discharge control unit 16C stops the discharge of the storage battery 13. When the remaining amount of the storage battery 13 is less than the minimum holding remaining amount, charging is performed so that the remaining amount does not fall below the minimum holding remaining amount.
Regarding the derivation and updating of the minimum retained amount at the time points of 13:00 and 16:00, the minimum retained amount derivation unit 16R shall perform the same processing as at the time of 10 o'clock.

At the next 19:00, the minimum retained amount deriving unit 16R derives the minimum retained amount again. The power consumption (predicted value) from 19:00 to 22:00 is larger than the power consumption at 16:00. Therefore, the minimum holding remaining amount deriving unit 16R updates the minimum holding remaining amount corresponding to the minimum holding time to a value of 50% of the total capacity of the storage battery 13.
The remaining amount of the storage battery 13 at 19:00 is 30% as a result of being controlled so as not to be lower than the minimum holding remaining amount derived at the time of the previous 16:00. The remaining amount of the storage battery 13 is less than 50% of the minimum remaining amount updated at 19:00. Therefore, the charge / discharge control unit 16C switches the charge / discharge control to the charging mode in which charging of the storage battery 13 is prioritized to charge the storage battery 13.

When the remaining amount of the storage battery 13 reaches 50%, which is the minimum remaining amount, the charge / discharge control unit 16C stops the charging mode in which the charging of the storage battery 13 is prioritized. In the daytime when the solar cell module 11 generates power, the charge / discharge control unit 16C then stores the surplus power generated by the solar cell module 11 in the storage battery 13, and as long as the remaining amount exceeds the minimum holding remaining amount, it is economical. As in the sex mode or the clean mode, the storage battery 13 is controlled to be discharged during power purchase. However, in the example of FIG. 3, charging stops at night later than 19:00. Therefore, the solar cell module 11 does not generate electricity, and the storage battery 13 does not store surplus electric power.

≪State transition of operation mode≫
As described in FIG. 3, the lightning warning linkage function switches the charge / discharge control of the storage battery 13 to the charge mode. However, even if the lightning warning linkage function is enabled, the storage battery 13 is not charged immediately. If the conditions are met, the charge / discharge control unit 16C charges the storage battery 13, but if the conditions are not met, the charge / discharge control unit 16C discharges in the same manner as in the economical mode or the clean mode. The same applies to the weather information linkage function.

FIG. 4 is an explanatory diagram showing an example of a state transition performed by the charge / discharge control unit 16C. As shown in FIG. 4, the charge / discharge control takes three states in this embodiment. The first state is "weather information / lightning warning non-cooperation state". In the following, it is abbreviated as non-cooperative state. The second state is the "lightning warning cooperation state". The third state is the "weather information cooperation state". In this embodiment, the state transitions to one of the three states according to the alertness of the acquired weather information. A state transition event is the issuance or release of meteorological information with different alert levels.

The non-cooperative state is a state of zero alertness. In this state, the weather information linkage is disabled or enabled in the weather information linkage setting 19c shown in FIG. 2, but the selected alarm or special warning related to the selected weather information is not issued. Is. In addition, the lightning warning cooperation is disabled or enabled in the lightning warning cooperation setting 19d, but the lightning warning is not issued. In the non-coordinated state, the charge / discharge control unit 16C controls the charge / discharge of the storage battery 13 in the economical mode or the clean mode.

The lightning warning cooperation state is a state in which the alert level is low. That is, the alert level is higher than the non-coordinated state, but the alert level is lower than the weather information linked state. In this state, the weather information linkage is disabled or enabled in the weather information linkage setting 19c shown in FIG. 2, but the selected alarm or special warning related to the selected weather information is not issued. Is. In addition, the lightning warning cooperation is effectively set in the lightning warning cooperation setting 19d, and the lightning warning is issued. In the lightning warning linked state, the charge / discharge control unit 16C charges the storage battery 13 when the remaining amount of the storage battery 13 is less than the minimum holding time corresponding to the minimum holding time set in the minimum holding time setting 19e. conduct. However, as long as the remaining amount of the storage battery 13 exceeds the minimum holding remaining amount, the charge / discharge control unit 16C performs charge / discharge control of the storage battery 13 in the same manner as in the economical mode or the clean mode.

The weather information linkage state is a state in which the degree of caution is high. That is, it is a state in which the degree of caution is higher than that in the non-coordinated state and the lightning warning linked state. In this state, the weather information linkage is effectively set in the weather information linkage setting 19c shown in FIG. 2, and the selected alarm or special warning related to the selected weather information is issued. In the weather information cooperation state, the charge / discharge control unit 16C compares the remaining amount of the storage battery 13 with the minimum holding amount corresponding to the predetermined minimum holding time corresponding to the weather information cooperation state. When the remaining amount of the storage battery 13 is less than the minimum holding amount corresponding to the minimum holding time, the storage battery 13 is charged. However, as long as the remaining amount of the storage battery 13 exceeds the minimum holding remaining amount, the charge / discharge control unit 16C performs charge / discharge control of the storage battery 13 in the same manner as in the economical mode or the clean mode.

When the lightning warning cooperation is effective and the lightning warning is issued in the non-coordination state, the charge / discharge control unit 16C shifts the state to the lightning warning cooperation state. Further, in the non-coordination state, when the selected alarm or the special warning related to the weather information for which the weather information cooperation is effective and selected is issued, the charge / discharge control unit 16C shifts the state to the weather information cooperation state.
When the selected alarm or special warning related to the weather information for which the weather information cooperation is effective and selected is issued in the lightning warning cooperation state, the charge / discharge control unit 16C shifts the state to the weather information cooperation state. In addition, in the lightning warning cooperation state, when the lightning warning is canceled or the lightning warning cooperation is invalidated, the state is changed to the non-cooperation state.

In the weather information linkage state, when the selected alarm or special warning is canceled or the weather information linkage is disabled, and the lightning warning linkage is valid and the lightning warning is being issued, the charge / discharge control unit 16C The state is changed to the lightning warning cooperation state. In the weather information linkage state, if the selected alarm or special warning is canceled or the weather information linkage is disabled, and the lightning warning is not issued or the lightning warning linkage is disabled, it is in the non-coordination state. Transition to.
The above is the state transition related to the charge / discharge control of the storage battery 13.

As described above, in this embodiment, when different types of meteorological information are issued at the same time with the same or different alert levels, the charge / discharge control of the storage battery can be appropriately performed in consideration of the meteorological information. For example, the meteorological information released by the Japan Meteorological Agency includes information on various meteorological conditions such as heavy rain, heavy snow, and storms, and different types of meteorological information are often announced at the same time. Furthermore, for each type of weather information, special warnings, warnings, and warnings are issued according to the degree of alertness. Special warnings, warnings, and warnings are issued alternately for the same type of weather conditions, but depending on the type of weather conditions, only warnings are specified and special warnings and warnings are not issued, or warnings and warnings. In some cases, only is specified and no special warning is issued. In this embodiment, when different types of meteorological information are issued at the same time with the same or different alert levels by setting the meteorological information linkage function and the lightning warning linkage function, the storage battery is appropriately considered in consideration of the meteorological information. Charge / discharge control can be performed.

≪Transition of minimum retained capacity≫
As shown in FIG. 4, in this embodiment, the minimum holding remaining amount also changes with the transition of charge / discharge control.
The minimum retained amount in the non-coordinated state is a predetermined minimum retained amount. This minimum holding capacity is a user-defined value, for example, 20% of the storage battery capacity. In the non-coordinated state, the charge / discharge control unit 16C controls the charge / discharge of the storage battery 13 so that the remaining amount of the storage battery does not fall below the minimum holding remaining amount.

The minimum holding amount in the lightning warning linked state is the minimum holding amount corresponding to a predetermined minimum holding time. The minimum retained amount in the lightning warning linked state is larger than the minimum retained amount in the non-linked state. If the minimum retained amount derived by the minimum retained amount derivation unit 16R is smaller than the minimum retained amount in the non-linked state, the minimum retained amount in the lightning warning linked state is the minimum retained amount in the non-linked state. Set so that it does not fall below. In the lightning warning cooperation state, the charge / discharge control unit 16C controls the charge / discharge of the storage battery 13 so that the remaining amount of the storage battery does not fall below the minimum holding remaining amount. In the lightning warning linked state, the charge / discharge control unit 16C charges the storage battery 13 when the remaining amount of the storage battery 13 is less than the minimum holding remaining amount. After charging, when the remaining amount of the storage battery 13 reaches the minimum holding remaining amount, charging by purchasing power is not performed. When the remaining amount of the storage battery 13 exceeds the minimum holding remaining amount, the charging / discharging of the storage battery 13 is controlled so that the remaining amount of the storage battery does not fall below the minimum holding remaining amount.

The minimum retained amount in the weather information linked state is the minimum retained amount corresponding to a predetermined minimum retained time. The minimum retained amount in the weather information linked state is larger than the minimum retained amount in the lightning warning linked state. In the weather information linkage state, the charge / discharge control unit 16C controls the charge / discharge of the storage battery 13 so that the remaining amount of the storage battery does not fall below the minimum holding remaining amount. In the weather information linkage state, the charge / discharge control unit 16C charges the storage battery 13 when the remaining amount of the storage battery 13 is less than the minimum holding remaining amount. After charging, when the remaining amount of the storage battery 13 reaches the minimum holding remaining amount, charging by purchasing power is not performed. When the remaining amount of the storage battery 13 exceeds the minimum holding remaining amount, the charging / discharging of the storage battery 13 is controlled so that the remaining amount of the storage battery does not fall below the minimum holding remaining amount. When the minimum holding remaining amount is fully charged, the charge / discharge control unit 16C does not charge / discharge when the storage battery 13 is fully charged, and stands by.

When the lightning warning cooperation is effective and the lightning warning is issued in the non-coordination state, the charge / discharge control unit 16C changes the minimum holding remaining amount to the minimum holding remaining amount in the lightning warning cooperation state. Further, in the non-coordinated state, when the selected alarm or the special warning related to the selected meteorological information is issued, the charge / discharge control unit 16C sets the minimum retained amount in the meteorological information linked state. Change to the minimum holding capacity.
When the selected alarm or special warning related to the weather information for which the weather information linkage is effective and selected is issued in the lightning warning linkage state, the charge / discharge control unit 16C sets the minimum retained amount in the weather information linkage state. Change the minimum holding capacity. In addition, when the lightning warning is canceled or the lightning warning is disabled in the lightning warning linkage state, the minimum holding remaining amount in the non-linkage state is changed.

In the weather information linkage state, when the selected alarm or special warning is canceled or the weather information linkage is disabled, and the lightning warning linkage is valid and the lightning warning is being issued, the charge / discharge control unit 16C Change the minimum retained amount to the minimum retained amount in the lightning warning linkage state. In the weather information linkage state, if the selected alarm or special warning is canceled or the weather information linkage is disabled, and the lightning warning is not issued or the lightning warning linkage is disabled, it is in the non-coordination state. Change to the minimum holding capacity of.

The above is the transition of the minimum holding remaining amount related to the charge / discharge control of the storage battery 13.
Here, the minimum retained amount in the weather information linked state is larger than the minimum retained amount in the lightning warning linked state. The charge / discharge control unit 16C charges the storage battery 13 if the minimum holding amount is smaller than the minimum holding amount in the weather information linkage state and the remaining amount of the storage battery 13 exceeds the minimum holding amount corresponding to the minimum holding time. Do not do. Therefore, the lightning warning linked state can suppress the charging frequency and the charging amount as compared with the weather information linked state.

≪Flowchart≫
Hereinafter, an example of the process executed by the charge / discharge control device 16 will be described with reference to the flowchart.
5A to 5D are flowcharts showing an example of charge / discharge control executed by the charge / discharge control device shown in FIG. Here, charge / discharge control in the lightning warning cooperation state will be described as a typical example. A person skilled in the art can easily infer the processing in the non-coordinated state and the weather information linked state from the processing in the lightning warning linked state.
The processes of FIGS. 5A to 5D are executed sequentially.

In FIG. 5A, the CPU of the charge / discharge control device 16 checks whether or not the lightning warning cooperation mode is a valid setting. That is, the content of the lightning warning linkage setting 19d shown in FIG. 2 is confirmed (step S11). If the lightning warning linkage setting is invalid (No in step S11), it is determined that the lightning warning linkage state is not taken (there is no processing to be executed), and the processing is terminated.
If the lightning warning linkage setting is valid (Yes in step S11), whether or not the selected alarm or the like related to the selected weather information has not been issued even if the weather information linkage is invalid or valid. Is confirmed (step S13). If the weather information cooperation is effective and the selected warning, etc. related to the selected weather information is issued (No in step S13), the weather information cooperation state with a higher priority is taken, so that the lightning warning cooperation state is set. Judges that there is no processing to be executed and terminates the processing.

Even if the weather information linkage is invalid or valid, if the selected warning or the like related to the selected weather information is not issued (Yes in step S13), the weather information acquisition unit 16W performs the weather information from an external server. Acquire (step S15). Then, it is examined whether or not a lightning warning has been issued (step S17). If the lightning warning has not been issued (No in step S17), the charge / discharge control unit 16C controls the charge / discharge of the storage battery in the same manner as in the operation mode in the non-coordinated state (step S19), and ends the process.

When the lightning warning is issued in the determination in step S17, the charge / discharge control device 16 may notify the user of the start of the lightning warning cooperation state depending on the situation (step S21). The notification may be displayed on the screen of the operation unit 18, but may be, for example, a voice notification. An example of a notification is as follows. An example of the screen display is "Because a lightning warning is being issued, keep the remaining battery level for the set standard time. If you do not need it, tap the link to enable" Lightning warning cooperation. Please uncheck "Yes". (Until you enable it again, you will not get the lightning warning). " At the same time, a link to the setting screen is displayed beside this notification display. Voice notifications should be simpler and easier for users to understand than screen displays. An example is "Because a lightning warning is being issued, we will keep the remaining battery level in case of a power outage."
Then, it is checked whether the system power is operating, that is, whether a power failure has occurred (step S23).
If a power failure has not occurred (Yes in step S23), the charge / discharge control device 16 as the minimum holding time determining unit 16T acquires the minimum holding time based on the content set in the minimum holding time setting 19e of FIG. 2 (Yes). Step S25).

Then, as the minimum holding remaining amount deriving unit 16R, the charge / discharge control device 16 acquires the predicted value of the power consumption in the period from the present time until the minimum holding time elapses (step S27 in FIG. 5B). The predicted value of power consumption may be based on history. The data related to the history may be stored in the charge / discharge control device 16. However, the history data may be stored in an external device (for example, the HEMS server 22) via the communication interface circuit 17. In that case, the charge / discharge control device 16 acquires the history data from an external device as the minimum retained remaining amount derivation unit 16R.
The history may be provided by applying, for example, AI (Artificial Intelligence) technology, or may be provided based on the history of not only one consumer but also a large number of consumers.

Further, the charge / discharge control device 16 as the minimum holding remaining amount deriving unit 16R obtains the minimum holding remaining amount of the storage battery based on the predicted values of the minimum holding time and the power consumption (step S29). Then, as the charge / discharge control unit 16C, the charge / discharge control device 16 performs charge / discharge control of the storage battery 13 so as to secure the obtained minimum remaining amount as the target remaining amount (step S31). The details of charge / discharge control in this step will be described later.

Subsequently, the charge / discharge control device 16 confirms whether the setting for enabling the lightning warning linkage is still continued (step S33). When the lightning warning cooperation is disabled (No in step S33), the lightning warning cooperation state is canceled and the state is changed to another state (step S35). At this time, the user may be notified that the lightning warning cooperation has been canceled. The notification may be displayed on the screen of the operation unit 18, but may be, for example, a voice notification. An example of notification is as follows for both screen display and voice notification. "The battery has been returned to the operating mode before the lightning warning was issued."

On the other hand, in the determination of step S33, when the setting for enabling the lightning warning linkage is continued (Yes in step S33), the charge / discharge control device 16 subsequently disables or enables the weather information linkage. It is examined whether or not the selected warning or the like of the selected weather information has been issued (step S37). If a predetermined period has passed since the previous weather information was acquired, the weather information will be acquired again here. When the weather information linkage is effective and the selected warning of the selected weather information is issued (No in step S37), the lightning warning linkage state is canceled and the state is changed to another state (No). Step S35). As described above, the user may be notified that the lightning warning cooperation has been canceled.

Even if the weather information linkage is invalid or valid, if the selected alarm or the like of the selected weather information is not issued (Yes in step S37), the charge / discharge control device 16 subsequently sends a lightning warning. Is still being announced (step S39).
When the lightning warning is canceled (No in step S39), the lightning warning cooperation state is canceled and the state is changed to another state (step S35). As described above, the user may be notified that the lightning warning cooperation has been canceled.

When the lightning warning continues (Yes in step S39), the charge / discharge control device 16 checks whether the system power is operating, that is, whether a power failure has occurred (step S41).
If a power failure has not occurred (Yes in step S41), the charge / discharge control device 16 subsequently obtains the minimum retained amount in step S29, and then a predetermined period (3 hours in this embodiment). ) Has passed, and it is checked whether or not it is time to update the minimum retained capacity (step S43).

If it is determined that the time has not yet come (No in step S43), the charge / discharge control device 16 returns the process to the above-mentioned step S31, and the charge / discharge control unit 16C repeats the charge / discharge control of the storage battery 13. Further, the above-mentioned process following step 31 is repeated.
On the other hand, when it is determined that it is time to update the minimum holding time (Yes in step S43), the charge / discharge control device 16 returns the process to the above-mentioned step S25 (see FIG. 5A) to reduce the minimum holding time and consumption. The process of obtaining the updated minimum retained capacity based on the predicted power value is repeated according to the procedure described above.

When it is determined in any of step S23 of FIG. 5A and step S41 of FIG. 5B that the system power is not operating, that is, a power failure has occurred, the charge / discharge control device 16 processes the process in the step shown in FIG. 5C. Proceed to S51 and start the self-sustaining operation of the system.
The user may be notified of the start of independent operation depending on the situation (step S53). The notification may be displayed on the screen of the operation unit 18, but may be, for example, a voice notification. An example of notification is as follows for both screen display and voice notification. "The battery system has switched to self-sustaining operation. There is a possibility of a power outage. Please check the situation at home."

During the self-sustaining operation, the charge / discharge control device 16 as the charge / discharge control unit 16C examines whether or not the power failure of the system power has been restored (step S57). If the power failure is not restored (No in step S57), the charge / discharge control device 16 continues the independent operation as the charge / discharge control unit 16C (step S59). Then, the process is returned to step S57, and the monitoring of power failure recovery is continued.
On the other hand, when the power failure is restored (Yes in step S57), the charge / discharge control device 16 cancels the self-sustaining operation of the system (step S61). The user may be notified of the cancellation of independent operation depending on the situation. The notification may be displayed on the screen of the operation unit 18, but may be, for example, a voice notification. An example of notification is as follows for both screen display and voice notification. "We have recovered from the power outage. We have canceled the self-sustaining operation of the storage battery system."
The charge / discharge control device 16 returns the process to S11 in step FIG. 5A, and executes the subsequent processes.

Finally, the details of charge / discharge control in step S31 (see FIG. 5B) will be described.
In step S31, the charge / discharge control device 16 as the charge / discharge control unit 16C acquires the current remaining amount of the storage battery 13 (step S71 in FIG. 5D). Then, the acquired remaining amount is compared with the target minimum retained amount (step S73).
When the remaining amount of the storage battery 13 is less than the target minimum holding remaining amount (Yes in step S73), the charge / discharge control device 16 performs an operation of charging the storage battery 13 as the charge / discharge control unit 16C (step S75), and steps S31. Ends the processing of.
On the other hand, when the remaining amount of the storage battery 13 is equal to or more than the target minimum holding remaining amount (No in step S73), the charge / discharge control device 16 is the storage battery as in the non-coordinated operation mode (economic mode or clean mode). Charge / discharge control is performed (step S77), and the process of step S31 is completed.
The above is the process executed by the charge / discharge control device 16 in the lightning warning linked state.

(Embodiment 2)
In the first embodiment, a state between a lightning warning cooperation state with a warning level, a weather information cooperation state with a higher warning level and a special warning level, and a non-cooperation state with a warning level of zero. The transition was described.
When there are a plurality of states having different alert levels, the process of transitioning the states so as to give priority to the high alert level states is not limited to the first embodiment.

For example, for weather information other than lightning warnings, such as heavy rain and storms, charge / discharge control may be performed differently depending on the warning level and the warning level. Further, different charge / discharge controls may be performed in three stages of a warning level, an alarm level, and a special alarm level.
For example, the charge / discharge control may be performed by applying a longer minimum holding time as the alertness increases. It may also allow the user to set individual minimum retention times for different alert levels.

Different minimum retention times may be set for different types of weather information, and users may individually set minimum retention times for each minimum retention time.
It is possible that warnings, warnings or special warnings related to different types of weather information will be issued in parallel. For example, a special warning may be issued for a storm and a warning for heavy rain may be issued at the same time. In parallel, warnings about floods may be issued.

As such, when information having different alertnesses related to different types of weather information is issued, the charge / discharge control device 16 determines the minimum holding time corresponding to each, and then adopts the longest minimum holding time. The charge / discharge control of the storage battery 13 may be performed.
Furthermore, it is conceivable that the predicted value of power consumption may differ under different weather conditions. In that case, the charge / discharge control device 16 may perform charge / discharge control of the storage battery 13 by adopting the largest minimum holding remaining amount after obtaining the minimum holding remaining amount corresponding to each.

(Embodiment 3)
In the first embodiment, the minimum holding remaining amount deriving unit 16R acquires the predicted value of the power consumption based on the history.
However, when acquiring the history, it is possible that the past data under similar conditions is not sufficiently accumulated. Alternatively, it is possible that the predicted value cannot be obtained from the outside due to a communication failure or the like.
In such a case, the minimum retained remaining amount deriving unit 16R may apply a predetermined minimum retained amount remaining amount instead of the normal process of acquiring the predicted value of the power consumption. Then, the charge / discharge control unit 16C may perform charge / discharge control using the minimum holding remaining amount.
In this case, when information having different alert levels related to different types of weather information is issued, the charge / discharge control device 16 determines the minimum retained amount corresponding to each, and then adopts the largest retained amount. Then, the charge / discharge control of the storage battery 13 may be performed.

(Embodiment 4)
In the first embodiment, the minimum holding amount of the weather information linkage state is the minimum holding amount corresponding to the guideline holding time.
However, instead of the process of deriving the minimum retained amount in the weather information linked state, a predetermined minimum retained amount may be applied. In this case, for example, the minimum retained amount may be set for each alert level according to the type of weather information and the difference between the warning and the special warning. Further, the setting of the minimum retained amount may be accepted for each type of weather information, and they may be combined.

For example, the minimum remaining amount of the weather information linkage state is fully charged. In the weather information cooperation state, the charge / discharge control unit 16C starts charging if the storage battery 13 is not fully charged. Then, when the storage battery 13 is fully charged, it does not discharge and stands by.
In the lightning warning cooperation state, the charge / discharge control unit 16C has a minimum holding amount smaller than the minimum holding amount in the weather information cooperation state, and the remaining amount of the lightning storage battery 13 is the minimum holding amount corresponding to the minimum holding time. If it exceeds the limit, the storage battery 13 is not charged. Therefore, the lightning warning linked state can suppress the charging frequency and the charging amount as compared with the weather information linked state.

(Embodiment 5)
In the first embodiment, the weather information acquisition unit 16W sequentially acquires the weather information provided from the outside. However, it is possible that the weather information cannot be obtained from the outside due to a communication failure or the like.
Therefore, if the meteorological information cannot be continuously acquired from the outside for a predetermined period of time, the charge / discharge control unit 16C may shift the charge / discharge control to a non-coordinated state in which the operation can be performed without the meteorological information.

(Embodiment 6)
In this embodiment, a case where the storage battery 13 is composed of two or more storage batteries (for example, storage batteries 13A and 13B) that can be charged and discharged independently is described. In that case, the minimum holding remaining amount of the storage batteries is set for each storage battery. As for the minimum retained capacity, the minimum retained capacity of all the storage batteries may be set to the same value, or different values may be set for each.
In the lightning warning linked state, the charge / discharge control unit 16C charges the storage battery whose remaining amount is less than the minimum holding remaining amount. (Hereinafter, this charge control is referred to as supplementary charging.) Further, during supplementary charging, if there is a storage battery whose remaining amount is larger than the minimum holding remaining amount, the battery is not discharged and is put on standby. Therefore, either charging or standby is controlled for each storage battery. When the remaining amount of all the storage batteries exceeds the minimum remaining amount, the supplementary charging is terminated.

A processing example is shown in FIG. In FIG. 6, it is assumed that the minimum holding amount derived for the storage battery 13A is 50%. If the remaining amount of the storage battery 13A is less than the minimum holding remaining amount at the time when the lightning warning is issued, the charge / discharge control unit 16C starts charging the storage battery 13A after the lightning warning is issued. When a weather warning is issued while a lightning warning is issued, the minimum holding remaining amount derivation unit 16R changes the minimum holding remaining amount to 100% (fully charged), and when the weather warning is canceled, the minimum holding remaining amount is changed. It is returned to 50%, but since the remaining amount during that period is less than 50%, charging is continued in any case of the minimum holding amount. Charging ends when the remaining amount reaches 50% after the weather warning is canceled. Then, it is controlled so as to wait with the remaining amount of 50% until the lightning warning is released. On the other hand, it is assumed that the minimum holding amount derived for the storage battery 13B is 40% at the time when the lightning warning is issued. The charge / discharge control unit 16C starts charging after the lightning warning is issued, and ends charging when the remaining amount reaches 40%. Then, it waits with the remaining amount of 40% until the lightning warning is released.

When a weather warning is issued during the lightning warning issuance, the charge / discharge control unit 16C changes the minimum holding remaining amount to 100% and starts charging 13B aiming at full charge. After that, when the weather warning was canceled, the remaining amount of the storage battery 13B was 55%, which exceeded 40% of the updated minimum remaining amount. At this time, the storage battery 13A is undergoing supplementary charging processing in a state where the remaining amount is less than 50% of the minimum holding remaining amount.
The charge / discharge control unit 16C causes the storage battery 13B to stand by without being discharged until the supplementary charge of the storage battery 13A is completed, even if the remaining amount of the storage battery 13B is 55%, which exceeds 40% of the minimum holding remaining amount. After that, when the storage battery 13A is charged to 50% of the minimum holding remaining amount and the supplementary charging process is completed, the charge / discharge control unit 16C discharges the storage battery 13B to 40% of the minimum holding remaining amount.

(Embodiment 7)
From a high or low alert state (lightning warning cooperation mode or weather warning cooperation mode), the lightning warning or weather warning is canceled and the alert level is zero (lightning warning cooperation mode or weather warning cooperation mode). When returning to the previous automatic operation mode), the minimum retained amount derivation unit 16R issues an alarm or warning from the set minimum retained amount (minimum retained amount in lightning warning cooperation mode or weather warning cooperation mode). The process of returning to the minimum retained amount (minimum retained amount in the automatic operation mode before the lightning warning cooperation mode or the weather warning cooperation mode) set before the issuance may be performed. In order to perform the process of returning to the previously set minimum retained amount, the minimum retained amount deriving unit 16R charges / discharges the minimum retained amount set at the stage when the alarm or warning is issued. It may be stored in a memory (not shown) of 16. It is preferable to store the minimum remaining amount in the non-volatile storage area so that it will not be erased even when a power failure occurs.

(Embodiment 8)
When the storage battery 13 is controlled by an external electric power company as a control device of a virtual power plant (VPP) and a weather warning or a lightning warning is issued, the lightning warning cooperation status or the weather information cooperation The state has priority. FIG. 7 shows the state transition when a weather warning or a lightning warning is issued.
Comparing FIG. 7 with FIG. 4, the weather information / lightning warning non-coordination state in FIG. 4 and the VPP controllable state in FIG. 7 correspond to each other. That is, the state transition when a lightning warning or a weather warning is issued in the VPP controllable state is the same as in FIG. Further, the state transition when the issued lightning warning or weather warning is canceled is the same as in FIG.
In FIG. 7, when a demand response (DR) request is received from an external electric power company in the VPP controllable state, the charge / discharge control unit 16C shifts the VPP controllable state to the VPP control state and requests it. The charge / discharge control of the storage battery 13 is performed according to the above.

When a lightning warning or a weather warning is issued in the VPP control state, the charge / discharge control unit 16C shifts the state to the lightning warning cooperation state or the weather information cooperation state. The transition destination of the state is the same as when a lightning warning or a weather warning is issued in the VPP controllable state. That is, the charge / discharge control of the lightning warning cooperation and the weather information cooperation is prioritized over the charge / discharge control as VPP.
Even when the transition from the VPP control state to the lightning warning linkage state or the weather information linkage state, the transition destination when the lightning warning and the weather warning are canceled is not the VPP control state but the VPP controllable state. be.

As mentioned above
(I) The charge / discharge control device according to the present invention includes a charge / discharge control unit that controls charging / discharging of the power storage device, a weather information acquisition unit that acquires one or more disaster prevention weather information from the outside, and a continuation from the power storage device to the load. Based on the holding time determining unit that determines the holding time for supplying power and the power load predicted during the determined holding time, the minimum holding remaining amount to be held by the power storage device is derived. The holding time determination unit determines the holding time according to at least one of the type or alertness of the disaster prevention weather information, and the charge / discharge control unit determines the disaster prevention weather. When the information is acquired, the charging / discharging of the power storage device is controlled with reference to the derived minimum holding remaining amount.

In the present invention, the meteorological information is information about meteorological conditions, such as various meteorological conditions such as heavy rain, heavy snow, and storms, particularly severe meteorological conditions that may cause a system power outage. .. Such weather information is called disaster prevention weather information. Specific embodiments thereof include special warnings, warnings, warnings, and lightning warnings for storms, blizzards, heavy rains, floods, storm surges, heavy snow, and waves. The severity of the weather means a severe phenomenon that leads to a disaster, in other words, a high degree of alertness, and warnings, warnings, and special warnings correspond to the high level of alertness. The lightning warning in the above-described embodiment corresponds to the meteorological information of the present invention. The weather information may be, for example, the above-mentioned warnings, warnings, and special warnings announced by the Japan Meteorological Agency, but is not limited to these, and is provided by a business operator or another person who provides a weather information providing service. It may be information.

Further, the power storage device stores energy and supplies the stored energy as electric power. A specific embodiment thereof is, for example, a storage battery. The method and configuration of the storage battery do not matter. The storage battery in the above-described embodiment corresponds to the power storage device of the present invention.
Furthermore, the prediction of the power load may be made based on, for example, a history, and the history may be the history of not only one consumer but also a large number of consumers. The history may be held by the charge / discharge control device, or may be acquired from an external device connected via communication.

The storage battery may be charged by using the electric power supplied from the grid power, or may use one or more types of power generation devices using natural energy. Specific aspects of the power generation device using natural energy include, but are not limited to, a solar cell module, and wind power generation and other power generation devices may be applied. The solar cell module in the above-described embodiment is included in the module for charging the storage battery according to the present invention.
Further, the charge / discharge control unit controls the charge / discharge of the storage battery. A specific embodiment thereof includes, for example, a hardware configuration centered on a CPU and a memory, and a charge / discharge control function is realized by the CPU executing a control program stored in the memory. Be done.

Further, preferred embodiments of the present invention will be described.
(Ii) The operation unit that accepts the setting of the minimum holding time by the user may be further provided, and the minimum holding time determination unit may determine the minimum holding time based on the setting accepted by the operation unit.
In this way, the user can set and update the minimum retention time using the operating unit. In addition, since the minimum holding time is measured by time as its name suggests, it is easier for the user to intuitively grasp the amount of electric power or the storage battery capacity that the user is not aware of in daily life.

(Iii) The meteorological information acquisition unit acquires a plurality of types of meteorological information having a degree of alertness according to the degree of intensity of the predicted weather, and the minimum holding time determination unit obtains the type or alertness of the meteorological information. The minimum retention time may be determined according to at least one of the degrees.
In this way, an appropriate minimum holding time can be determined according to the type and severity of the predicted weather, that is, the degree of alertness.
Here, the degree of alertness refers to the degree of caution required. It can be said that it is a degree of danger.

(Iv) When the meteorological information acquisition unit acquires a plurality of different types of meteorological information, the minimum holding time determination unit sets the longest of the minimum holding times according to each meteorological information in that case. It may be determined as the minimum retention time.
In this way, when a plurality of different types of weather information are obtained at the same time, the minimum holding time is determined on the safest side.

(V) Further provided with a communication interface circuit that communicates with an external device, the minimum holding remaining amount derivation unit communicates with an external device that stores the history and acquires a predicted value related to the power load during the minimum holding time. If the predicted value cannot be obtained, a predetermined value may be used instead of the predicted value to be obtained.
By doing so, for example, even when the history data is not sufficiently accumulated or the history data cannot be acquired from the outside due to a communication failure caused by severe weather, the minimum value is maintained by using a predetermined value. The remaining amount can be derived.

(Vi) Further, a preferred embodiment of the present invention includes a charge / discharge control system including the above-mentioned charge / discharge control device and a power storage device controlled by the charge / discharge control device.
(Vii) A preferred embodiment of the present invention is to determine a step of acquiring one or more types of meteorological information from the outside and a minimum holding time for allowing the power storage device to supply power to the load, as steps performed by the computer. Refer to the step, the step of deriving the minimum remaining amount to be held by the power storage device based on the power load predicted during the determined minimum holding time, and the derived minimum holding amount. A charge / discharge control method including a step of controlling charge / discharge of the power storage device is included.

Preferred embodiments of the present invention include a combination of any of the plurality of embodiments described above.
In addition to the embodiments described above, there may be various variations of the present invention. These variations should not be construed as not belonging to the scope of the present invention. The present invention should include the meaning equivalent to the claims and all modifications within the said scope.

10: Charge / discharge control system, 11: Solar cell module, 12: Power conditioner, 13, 13A, 13B: Storage battery, 14: Distribution board, 15: Smart meter, 16: Charge / discharge control device, 16C: Charge / discharge control unit , 16R: Minimum retention remaining amount derivation unit, 16T: Minimum retention time determination unit, 16W: Meteorological information acquisition unit, 17: Communication interface circuit, 18: Operation unit, 19: Meteorological cooperation setting screen, 19a: Setting display area, 19b : Regional setting, 19c: Meteorological information linkage setting, 19d: Lightning warning linkage setting, 19e: Minimum holding time setting, 19f: Operation button, 21: Grid power grid, 22: HEMS server NW: Network

Claims (10)

A charge / discharge control unit that controls the charge / discharge of the power storage device,
The weather information acquisition department that acquires one or more disaster prevention weather information from the outside,
A holding time determining unit that determines a holding time that enables continuous power supply from the power storage device to the load, and a holding time determining unit.
A minimum holding remaining amount deriving unit for deriving the minimum holding remaining amount to be held by the power storage device based on the power load predicted during the determined holding time is provided.
The holding time determining unit determines the holding time according to at least one of the type of disaster prevention weather information or the alertness.
The charge / discharge control unit is a charge / discharge control device that controls the charge / discharge of the power storage device by referring to the derived minimum holding remaining amount when the disaster prevention weather information is acquired. It is further equipped with an operation unit that accepts the user's setting of the holding time.
The charge / discharge control device according to claim 1, wherein the holding time determining unit determines a holding time based on a setting received by the operation unit. The minimum retained amount derivation unit derives and updates the minimum retained amount corresponding to the holding time while the disaster prevention weather information is acquired and the acquired disaster prevention weather information continues. Alternatively, the charge / discharge control device according to 2. When the weather information acquisition unit acquires a plurality of different types of weather information, the holding time determining unit determines the longest holding time according to each weather information as the holding time in that case. The charge / discharge control device according to claim 3. The weather information acquisition unit further acquires the second disaster prevention weather information, which has a higher degree of caution than the disaster prevention weather information.
When the second disaster prevention weather information is acquired, the charge / discharge control unit controls to fully charge the power storage device regardless of whether charge / discharge control based on the disaster prevention weather information is performed. The charge / discharge control device according to claim 1. The weather information acquisition unit further acquires the second disaster prevention weather information associated with the predetermined minimum retained amount in addition to the disaster prevention weather information associated with the holding time.
When the second disaster prevention weather information is acquired, the charge / discharge control unit is associated with the second disaster prevention weather information regardless of whether charge / discharge control based on the disaster prevention weather information is performed. The charge / discharge control device according to claim 1, wherein the charge / discharge of the power storage device is controlled based on the minimum retained amount. The weather information acquisition unit further acquires the second disaster prevention weather information associated with the predetermined minimum retained amount in addition to the disaster prevention weather information associated with the holding time.
When both the disaster prevention weather information and the second disaster prevention weather information are acquired, the charge / discharge control unit responds to the minimum retained amount based on the acquired disaster prevention weather information and the acquired second disaster prevention weather information. The charge / discharge control device according to claim 1, wherein charging / discharging of the power storage device is controlled based on the largest minimum holding remaining amount among the minimum holding remaining amount. It also has a communication interface circuit that communicates with external devices.
The minimum holding remaining amount derivation unit communicates with an external device that stores the history to acquire a predicted value related to the power load during the minimum holding time, and if the predicted value cannot be obtained, it is predetermined. The charge / discharge control device according to any one of claims 1 to 7, which is used instead of the predicted value for which the value should be acquired. The charge / discharge control device according to any one of claims 1 to 8.
The power storage device controlled by the charge / discharge control device and
Charge / discharge control system. As a step that the computer takes
Steps to acquire one or more types of weather information from the outside,
Steps to determine the minimum retention time that allows the power storage device to power the load, and
A step of deriving the minimum remaining amount to be retained by the power storage device based on the expected power load during the determined minimum holding time, and
A step of controlling charging / discharging of the power storage device with reference to the derived minimum holding amount, and
A charge / discharge control method comprising.

Images