JP2018121439A - Power control device and power control method - Google Patents

Abstract

To provide a power control apparatus and a power control method capable of increasing a power supply time from a secondary battery to a load. A power control apparatus 1 for controlling power supply from a power system 2 or a secondary battery 4 to a load 5, comprising a power failure detection unit 11 for detecting a power failure in the power system, charging of the secondary battery, and A battery control unit 12 that controls discharge and a load control unit 13 that controls power supply to each load. When the power failure detection unit detects a power failure, the battery control unit is configured to target charge the secondary battery. By changing the rate, the power supply capability from the secondary battery to each load is increased, and the load control unit limits the power supply to each load. [Selection] Figure 1

Description

  The present invention relates to a power control apparatus and a power control method.

  In recent years, secondary batteries such as lithium-ion batteries have been used as power storage power sources for so-called smart houses, buildings, microgrids, etc. Efforts to use energy are being promoted. By the way, the characteristics of the secondary battery deteriorate due to charge / discharge and storage conditions. Since the above power storage power source is assumed to have a long use period, it is important to suppress deterioration of the characteristics of the secondary battery.

  Here, the state of charge (SOC) of the secondary battery is set corresponding to the intermediate capacity or voltage, with the fully charged state of the secondary battery being 100% SOC and the fully discharged state being 0% SOC. ing. In general, in order to suppress the deterioration of the characteristics of the secondary battery, the normal SOC is limited. The upper limit SOC is set to less than 100% and the lower limit SOC is set to a value above 0%.

  However, in the event of a power outage due to a disaster or accident, the power supply for BCP (Business Continuity Plan) will be lowered to lower the set value of the lower limit SOC of the secondary battery and increase the dischargeable capacity. Sometimes. Patent Document 1 proposes a method of lowering the lower limit SOC of a secondary battery at the time of a power failure in a commercial system.

JP2015-126560A

  Patent Document 1 describes a technique for setting a lower limit SOC based on power consumption of a load depending on the current season, region, or family structure. Patent Document 1 also describes a method of lowering the lower limit SOC of the secondary battery during a power failure.

  However, Patent Document 1 focuses only on the control of the lower limit SOC of the secondary battery, and does not focus on the load that consumes power from the secondary battery. Therefore, in patent document 1, the effect which extends battery operating time at the time of a power failure was limited, and was inadequate. Furthermore, Patent Document 1 does not consider a decrease in reliability due to lowering the lower limit SOC.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a power control device and a power control method capable of increasing the power supply time from the secondary battery to the load. is there. Another object of the present invention is to provide a power control apparatus and a power control method capable of increasing the power supply time to the load while maintaining the reliability of the secondary battery.

  In order to solve the above problems, a power control device according to the present invention is a power control device that controls power supply from a power system or a secondary battery to a plurality of loads, and detects a power failure in the power system. And a battery control unit that controls charging and discharging of the secondary battery, and a load control unit that controls power supply to each load, and when the power failure detection unit detects a power failure, By changing the target charging rate of the secondary battery, the power supply capability from the secondary battery to each load is increased, and the load control unit limits the power supply to each load.

  According to the present invention, when a power failure is detected, the target charging rate of the secondary battery is changed, and the power supply capability from the secondary battery to each load is increased. For this reason, the power supply time from the secondary battery to the load can be increased.

1 is an overall view showing a system including a secondary battery and a load, and a configuration of a power supply device that controls power supply of the control system. It is an example of the table which manages the importance of each load. It is a flowchart of a power control process. FIG. 7 is an overall view illustrating a control system including a secondary battery and a load and a configuration of a power control device according to a second embodiment. An example of a table for managing the importance level of a load and an example of a table for managing the relationship between the importance level and the charging rate according to the fourth embodiment are shown. It is an example of the table which concerns on 5th Example and manages the importance of load. FIG. 16 is an overall view illustrating a control system including a secondary battery and a load and a configuration of a power control device according to a sixth embodiment. It is a flowchart of a power control process according to the seventh embodiment. It is a flowchart of the process which monitors the change log | history of the target SOC of a secondary battery.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the power supply from the system power 2 is stopped for the control system PS that is connected to the system power 2 and includes the storage battery 4 as a “secondary battery” and a plurality of loads 5 therein. Even at times, the electric power from the storage battery 4 is supplied to the important load 5 in the control system PS. Thereby, in this embodiment, operation of the important load 5 can be maintained, and damage to the business related to the important load 5 is reduced.

  Therefore, the power control apparatus 1 according to the present embodiment is a power control apparatus 1 that controls the power of a control system PS connected to an electric power system, including a plurality of loads 5 and a chargeable / dischargeable storage battery 4. 4, the battery control unit 12 that controls the charging and discharging of the storage battery, the load control unit 13 that controls the power supply to each load 5, and the importance of each load. The importance management part 14 to manage and the power failure detection part 11 which detects the power failure of an electric power grid | system are provided. The battery control unit 12 has a function of setting a lower limit value in a normal state of charge of the storage battery 4 and a lower limit value in the event of a power failure. When the power failure detection unit 11 detects a power failure, the battery control unit 12 sets the lower limit value of the charged state of the storage battery 4 to the lower limit value at the time of the power failure. And the load control part 13 restrict | limits the electric power supply with respect to load with low importance.

  According to the present embodiment, the power supply capability of the storage battery 4 can be increased at the time of a power failure, so the time for supplying power from the storage battery 4 to an important load in a so-called smart house, building, microgrid, etc. is extended. be able to. As a result, according to the present embodiment, by continuing to supply power to the important load, it is possible to improve the reliability with respect to the continuation of the business related to the important load.

  Embodiments will be described with reference to FIGS. The following description shows specific examples of the contents of the present invention. The present invention is not limited to the following description, and various modifications and changes by those skilled in the art within the scope of the technical idea disclosed in this specification. Correction is possible.

  FIG. 1 shows a power control apparatus 1 according to the first embodiment and a control system PS controlled by the power control apparatus 1. The control system PS includes a power supply line 3 connected to a transformer 2 that is a part of a power system, a chargeable / dischargeable storage battery 4 connected to the power supply line 3, and a plurality of power supply lines 3 connected to the power supply line 3 and the storage battery 4. Load 5 and a switch 6 for limiting power supply to each load 5.

  The storage battery 4 as a “secondary battery” can be configured, for example, as a lead storage battery, a nickel hydride secondary battery, a lithium secondary battery, a sodium sulfur secondary battery, or the like. In the drawing, a plurality of storage batteries 4 (1) to 4 (n) are shown, but any one of them may be used. The whole of the plurality of storage batteries 4 (1) to 4 (n) can also be referred to as a storage battery system 40. The storage battery 4 is a general term for the storage batteries 4 (1) to 4 (n), and is a name that is not particularly distinguished. The storage battery 4 is charged by receiving power from the power system 2 via the feeder line 3. The storage battery 4 supplies power to the load 5 through the power supply line 3 and the switch 6 by discharging the stored power to the power supply line 3 at the time of a power failure.

  The loads 5 (1) to 5 (n) are various loads such as lighting equipment, air conditioning equipment, air conditioning equipment, communication equipment, office equipment, a computer, and an electric motor. The load 5 can also include a cooling device such as an air cooling fan that cools the storage battery 4. When the loads 5 (1) to 5 (n) are not particularly distinguished, they are referred to as loads 5.

  The switches 6 (1) to 6 (n) are devices that limit the power supplied from the feeder 3 to the load 5. “Limiting power” means reducing the amount of power supplied to the load 5 by changing the current value or the voltage value. It also includes setting the electric energy to zero. That is, limiting the power to the load 5 includes at least one of reducing the amount of power supplied to the load 5 or stopping the power supply to the load 5. When the switches 6 (1) to 6 (n) are not particularly distinguished, they are called switches 6. The switches 6 may be provided for each load 5 on a one-to-one basis, or one switch 6 may be provided for a plurality of loads 5. In the case where the load 5 includes a plurality of electric circuits and these electric circuits can be individually turned on / off, a switch 5 may be provided for each of the electric circuits.

  The switch 5 can also be provided inside the load control unit 13. The load control unit 13 includes a plurality of power limiting circuits connected to each load 5, and can control the power supply to each load 5 by controlling the operation of these power limiting circuits.

  A configuration example of the power control apparatus 1 will be described. The power control apparatus 1 can be configured using, for example, a computer system including a microprocessor, a memory, an input / output circuit, a communication circuit, and the like. The power control apparatus 1 includes, for example, a power failure detection unit 11, a battery control unit 12, and a load control unit 13. The power control apparatus 1 can also include a load importance management unit 14 that manages the importance of each load 5 and a notification unit 7 that provides information to the user. The contents of the load importance management unit 14 will be described later with reference to FIG. The notification unit 7 is a device that notifies the user of a change in the operation mode of the power control device 1 and the like. The notification unit 7 provides information to the user through, for example, a display, a printer, a voice synthesizer, e-mail, or the like.

  Here, the user is, for example, an administrator who manages the power control apparatus 1 or a user of the control system PS (for example, a building manager, an owner, a tenant manager who rents the building floor, etc.) It is.

  The power failure detection unit 11 detects whether a power failure has occurred in the power system 2 via the state of the power supply line 3, and sends a detection signal to the battery control unit 12 and the load control unit 13.

  The battery control unit 12 monitors the SOC as the “charge rate” of the storage battery 4 and controls charging and discharging of the storage battery 4 based on the SOC. The battery control unit 12 has a function of setting a lower limit SOC-L1 during normal SOC of the storage battery 4 and a lower limit SOC-L2 during power failure. The lower limit value of the SOC is a “lower limit charge rate” included in the “target charge rate”. The target charging rate includes an upper limit charging rate as will be described later. When the power failure detection unit 11 detects a power failure, the battery control unit 12 changes the SOC lower limit value of the storage battery 4 from SOC-L1 to SOC-L2. Hereinafter, the lower limit value of the SOC may be referred to as the lower limit SOC and the lower limit value SOC.

  Here, the case where a lithium ion battery is used as the storage battery 4 is demonstrated. In a lithium ion battery, the voltage corresponding to 100% SOC is often about 4.0 to 4.3V, and the voltage corresponding to 0% SOC is often about 2.5 to 3.2V. In this case, SOC-L1 is desirably 10 to 40%. The SOC-L2 is a lower value than the SOC-L1 (SOC-L1> SOC-L2), and is preferably a value of 0 to 30%.

  By reducing the lower limit charging rate of the storage battery 4 from SOC-L1 to SOC-L2 at the time of a power failure, the amount of power corresponding to the difference between the lower limit charging rates can be supplied to the load 5.

  The load control unit 13 controls power supply to each load 5 through the switch 6. In the event of a power failure, the load control unit 13 restricts power supply to a less important load so that power is supplied to the important load among the loads 5 according to the importance managed by the load importance management unit 14. To do.

  The load importance level management table T1 in FIG. 2 is a table managed by the load importance level management unit 14. The load importance level management table T1 manages, for example, a load number (load #) C11, an importance level C12, and power consumption C13 in association with each other.

  The load number C11 is information for identifying each load 5 in the control system PS. The importance C12 is information indicating the importance based on a predetermined index such as business continuity. One of values of at least two levels is set as the importance C12. Here, one of “0” and “1” is set as the importance. The load 5 with the importance level “1” is more important than the load 5 with the importance level “0”. The power consumption C13 is information indicating the power consumption of the load 5.

  In FIG. 2, the importance is set for each load, but instead, the importance may be set for each group including a plurality of loads.

  FIG. 3 is a flowchart of the power control process executed by the power control apparatus 1. The power failure detection unit 11 monitors whether or not a power failure has occurred in the power system 2 (S11). When detecting the power failure (S11: YES), the power failure detection unit 11 notifies the battery control unit 12 and the load control unit 13 to that effect.

  Receiving the notification of the occurrence of the power failure, the battery control unit 12 changes the lower limit charging rate of the storage battery 4 from the normal value SOC-L1 to the power failure value SOC-L2 (S12). Thereby, the electric energy which can be supplied from the storage battery 4 to the load 5 increases.

  When the load control unit 13 receives the notification of the occurrence of a power failure from the power failure detection unit 11, the load control unit 13 refers to the table T1 managed by the load importance level management unit 14, acquires the importance level of each load 5, and The power supply to the low load is limited (S13). Here, since the importance level is set at two levels, the load having the lower value “0” is treated as a load having a lower importance level. The load with low importance corresponds to “predetermined load”.

  The load control unit 13 may uniformly limit power supply to loads with low importance, or may individually limit power supply based on load characteristics. For example, the load control unit 13 can cut off the power supply to a load with low importance. Alternatively, the load control unit 13 can supply only standby power to a load with low importance.

  While the load control unit 13 restricts power supply to a load with low importance, power supply to a load with high importance (a load for which importance “1” is set) continues. That is, the power control apparatus 1 can distribute the power supply limited to the load with the importance level 0 to the load with the importance level 1. Thereby, the power control apparatus 1 can extend the operation time of the load with high importance.

  Finally, the power control device 1 notifies the user from the notification unit 7 that at least one of the fact that the lower limit SOC of the storage battery 4 has been changed or that power is supplied only to an important load (S14).

  An example of power distribution performed in the control system PS will be described with reference to FIG. The loads 5 with the load number C11 being # 1 to # 7 will be described. The total value of the power consumption C13 of the loads 5 (# 1) to 5 (# 7) is 50 kW. Among them, the total power consumption of the important loads 5 (# 2), 5 (# 3), and 5 (# 7) with the importance set to “1” is 20 kW.

  Assume that the capacity of the storage battery 4 is 50 kWh, the lower limit SOC-L1 in the normal state of charge is 20%, and the lower limit SOC-L2 at the time of power failure is 0%. A case where an unexpected power failure occurs when the state of charge of the storage battery 4 is at the normal lower limit SOC-L1 will be described.

  In this case, the capacity of the storage battery remaining when a power failure occurs is 10 kWh (= 50 kWh × 20%). If the lower limit SOC of the storage battery 4 is not changed, the control system PS is immediately stopped completely. This is because power cannot be supplied from the storage battery 4 to the load 5.

  Next, when only the lower limit SOC of the storage battery 4 is lowered, the duration of the control system PS is 10 kWh / 50 kW = 0.2 h, that is, 12 minutes. By reducing the lower limit SOC from 20% to 0%, 10 kWh of power can be supplied from the storage battery 4 to the load 5.

  Further, consider the case where the power supply to the less important loads 5 (# 1) and 5 (# 4) to 5 (# 6) is cut off. In this case, loads 5 (# 1), 5 (# 4) to 5 (# 6) having low importance are included in loads 5 (# 2), 5 (# 3), and 5 (# 7) having high importance. Since the power that could have been supplied to is also distributed, the operation time is extended to 10 kWh / 20 kW = 0.5 h, that is, 30 minutes.

  According to this embodiment configured as described above, the operation target of the important load can be extended by limiting the operation target to the load 5 having a high importance and lowering the lower limit SOC of the storage battery 4. By combining this restriction of power distribution destinations with the improvement of the power supply capacity of the storage battery 4, it is possible to extend the power supply time to a highly important load and improve the reliability of business continuity. it can. According to the present embodiment, even when a power failure occurs, it is possible to safely stop the load 5 having a high degree of importance or to complete the backup process of important data, thereby improving usability and reliability.

  A second embodiment will be described with reference to FIG. Each of the following embodiments including the present embodiment corresponds to a modification of the first embodiment, and therefore, differences from the first embodiment will be mainly described. In this embodiment, the importance level of the load 5 can be set from the outside.

  FIG. 4 is an overall configuration diagram according to the present embodiment. The power control apparatus 1 </ b> A according to the present embodiment further includes a setting unit 15. The user can manually set the importance of any load 5 at any time via the setting unit 15.

  Configuring this embodiment like this also achieves the same operational effects as the first embodiment. Further, according to the present embodiment, for example, when there is a load whose importance changes irregularly, the user sets the importance of the load in advance before entering the time zone in which the importance is predicted to increase. Can be high. As a result, even if a power failure occurs during that time, the operating time of the load can be extended.

  For example, the importance of the heating facility in the severe winter is higher than the importance in other seasons. For example, the importance level of the cooling equipment during the heat wave is higher than the importance level in other seasons. For example, the importance of each facility in the treatment room during surgery is higher than the importance in the time zone when surgery is not performed. The importance of the server in the time zone for processing a large amount of access is higher than the importance in other time zones. In this way, when the importance changes depending on the load characteristics, season, weather, time zone, etc., the user can change the importance using the setting unit 15 and can respond to an unexpected situation. . The setting unit 15 may have a calendar timer function so that the importance can be automatically changed according to the schedule.

  A third embodiment will be described. Usually, the storage battery 4 is provided with a liquid cooling or air cooling cooling device. The storage battery 4 generates heat due to internal resistance during charging and discharging, and the temperature rises. If the storage battery 4 is left at a high temperature, the deterioration proceeds, resulting in long-term performance degradation. For this reason, the storage battery 4 includes a cooling device as one of the loads 5.

  However, since the internal resistance of the storage battery 4 decreases as the temperature increases, the battery performance improves in the short term when the storage battery 4 reaches a high temperature.

  Therefore, in this embodiment, the importance of the cooling device for the storage battery 4 is set low, and the power supply is cut off and stopped at the time of a power failure. Thereby, according to a present Example, the energy loss reduction by the fall of the internal resistance of the storage battery 4 and the power consumption suppression of a cooling device combine, and the effective capacity | capacitance of the storage battery 4 can be increased.

  A fourth embodiment will be described with reference to FIG. In the fourth embodiment, the importance of the load 5 can be set to 3 levels or more. In this embodiment, the same number of SOC levels as the number of importance levels is stored. The level of importance corresponds to the level of SOC.

  FIG. 5 shows an example of a table in the present embodiment. Similar to the table T1 described in FIG. 2, the load importance level management table T1A manages the load number C11, the importance level C12, and the power consumption C13 in association with each other. However, in the load importance level management table T1A of this embodiment, the importance levels are set at three levels of “0”, “1”, and “2”.

  Each of the loads 5 (# 1) to 5 (# 7) is assigned any importance of “0”, “1”, and “2”. The importance-SOC management table T2 defines the relationship between the importance C21 and the SOC C22. In the table T2, the charge levels of the storage batteries 4 are associated with the importance levels “0”, “1”, and “2”, respectively. In the example of FIG. 5, 100% SOC corresponds to importance 0, 20% SOC corresponds to importance 1, and 0% SOC corresponds to importance 2.

  When the SOC of the storage battery at the time of a power failure falls below the level specified in FIG. 5, the power control device 1 cuts off or restricts the power supply to the load of the corresponding importance level. Here, it is assumed that the capacity of the storage battery 4 is 50 kWh, the lower limit SOC-L1 in the normal state of charge is 20%, and the lower limit SOC-L2 at the time of power failure is 0%. And the case where a power failure generate | occur | produces when the charge condition of the storage battery 4 is 50% is demonstrated.

  In this case, the remaining capacity of the storage battery 4 is 25 kWh. Since the SOC is 100% or less, the power supply to the loads 5 (# 1) and 5 (# 4) to 5 (# 6) having zero importance is cut off. As a result, the total power consumption is 20 kW, which is the sum of the power consumption of the loads 5 (# 3) and 5 (# 7) with the importance level 1 and the power consumption of the load 5 (# 2) with the importance level 2. If the power failure continues in this state, the SOC of the storage battery 4 gradually decreases and decreases to 50 kWh × (50−20) / 100/20 kW = 0.75 h, that is, to 20% SOC after 45 minutes.

  At this time, the remaining capacity of the storage battery 4 is 10 kWh. At this time, the load control unit 13 cuts off or restricts the power supply to the loads 5 (# 3) and 5 (# 7) having the importance level 1. As a result, the total power consumption of the control system PS is 10 kW, which is the power consumption of the load 5 (# 2) of importance 2.

  If the power outage continues thereafter, the operating time of the load 2 (# 2) of importance 2 is 50 kWh × (10−0) / 100/10 kW = 0.5 h, that is, 30 minutes.

  Configuring this embodiment like this also achieves the same operational effects as the first embodiment. Furthermore, in this embodiment, the importance is set at three or more levels, and the SOC corresponding to each level is set. Therefore, depending on the SOC of the storage battery at the time of a power failure and the duration of the power failure, The degree of damage can be changed. As a result, in this embodiment, it is possible to continue the operation of a truly important load even during a long-term power failure while minimizing damage due to a load stop during a short-time power failure.

  A fifth embodiment will be described with reference to FIG. In the present embodiment, the importance is stored for each load 5 according to information including at least one of season, day of the week, time, and weather, for example. FIG. 6 is an example of the load importance management table T1B used in this embodiment. Similarly to the table T1 described in FIG. 2, the table T1B also manages the load number C11, importance C12, and power consumption C13 in association with each other.

  Further, in the load importance level management table T1B of the present embodiment, the load importance level C12 is set separately for weekdays from Monday to Friday, and on Saturdays, Sundays and holidays.

  In the example of FIG. 6, the power consumption of all loads is 50 kW, the total power consumption of loads 5 (# 3) and 5 (# 7) with importance 1 on weekdays is 20 kW, and importance 1 on Saturdays, Sundays and public holidays The total power consumption of the loads 5 (# 1) and 5 (# 5) to 5 (# 7) is 17 kW. These loads always operate with the power consumption shown in FIG.

  In addition, it is good also as a structure which can set the importance of a load each according to a weather, a season, or a time slot | zone instead of a day of the week.

  Configuring this embodiment like this also achieves the same operational effects as the first embodiment. Furthermore, in this embodiment, since the importance level of the load can be changed according to information including the season, day of the week, time, and weather, the load 5 to be operated even during a power failure can be selected according to the information such as the season. And the reliability of the BCP can be further improved.

  A sixth embodiment will be described with reference to FIG. The power control apparatus 1 </ b> B according to the present embodiment includes an external information acquisition unit 16 that acquires information from the server 8. The power failure detection unit 11 predicts the occurrence of a power failure based on external information. When the power failure detection unit 11 predicts the occurrence of a power failure, the power failure detection unit 11 notifies the battery control unit 12 and the load control unit 13 of the prediction result. In addition, since control when a power failure actually occurs is the same as that described in the first embodiment, the description thereof is omitted.

  The servers 8 (1) to 8 (n) as “external information sources” are, for example, servers that distribute weather information, servers of electric utilities that publish the schedule of scheduled power outages, and the like. If there is no particular distinction, the server 8 is called. The server 8 is connected to the external information acquisition unit 16 of the power control apparatus 1B via the communication network CN. The external information acquisition unit 16 delivers the information acquired from the server 8 to the power failure detection unit 11.

  Based on the information obtained from the server 8, the power failure detection unit 11 predicts whether a power failure will occur with a probability greater than or equal to a predetermined value within a predetermined time from the current time. The power failure detection unit 11 may automatically predict the possibility of the occurrence of a power failure based on external information, or may make a prediction based on user judgment. Or the structure which inquires the prediction calculation server (not shown) provided in the exterior of the electric power control apparatus 1B, and receives the calculation result may be sufficient as the possibility of a power failure generation | occurrence | production.

  The battery control unit 12 has a function of changing the upper limit values (SOC-H1, SOC-H2) in addition to the lower limit values (SOC-L1, SOC-L2) of the SOC of the storage battery 4. The upper limit value of the SOC corresponds to the “upper limit charging rate” included in the “target charging rate”.

  When the battery control unit 12 receives a notification from the power failure detection unit 11 that the power failure has been predicted, the battery control unit 12 changes the SOC upper limit value of the storage battery 4 from the normal upper limit value SOC-H1 to the power failure prediction upper limit value SOC-H2. To do.

  Here, the upper limit SOC-H1 in the normal state is desirably 60-90%. The upper limit SOC-H2 at the time of power failure prediction is a value equal to or higher than the normal value SOC-H1 and is preferably 70 to 100%.

  FIG. 8 is a flowchart showing power control processing at the time of power failure prediction according to the present embodiment. The external information acquisition unit 16 acquires information from the server 8 (S21). The power failure detection unit 11 predicts the possibility of power failure based on the information obtained from the server 8 (S22).

  When the power failure detection unit 11 predicts the occurrence of a power failure (S22: YES), the battery control unit 12 changes the SOC upper limit value of the storage battery 4 from the normal value SOC-H1 to the power failure prediction value SOC-H2 ( S23). And the battery control part 12 starts charge of the storage battery 4, and charges to upper limit SOC-H2 (S24).

  On the other hand, the load control unit 13 restricts power supply to the unimportant load 5 according to the contents of the table T1 managed by the load importance level management unit 14 (S25).

  Finally, the power control apparatus 1B notifies the user through the notification unit 7 that the power outage that is predicted to occur is supported (S26).

  Thereby, when a power failure is predicted, the state of charge of the storage battery 4 can be maintained in a high state (SOC-H2) and wait before the occurrence of the power failure. Therefore, the amount of power that can be supplied from the storage battery 4 to the important load when a power failure actually occurs is greater than in the first embodiment. As a result, the reliability of the BCP at the time of a power failure can be further increased.

  A seventh embodiment will be described with reference to FIG. In a present Example, the storage battery corresponding to the time of a power failure or a power failure prediction is determined based on the change history of the target SOC (SOC lower limit value, SOC upper limit value) of the storage battery 4.

  FIG. 9 is a flowchart showing the storage battery monitoring process. The battery control unit 12 monitors whether the target SOC has been changed in step S13 of FIG. 3 or step S24 of FIG. 8 (S31).

  When the target SOC is changed (S31: YES), the battery control unit 12 stores the change history of the target SOC (S32), and determines whether the number of changes of the target SOC is equal to or greater than a predetermined threshold Th (S33). .

  When the number of changes is greater than or equal to the threshold Th (S33: YES), the battery control unit 12 outputs an alarm for the storage battery 4 whose number of changes exceeds the threshold Th (S34). The battery control unit 12 presents a message such as “the number of changes in the target SOC of the storage battery 00 has exceeded the specified value Th” from the notification unit 7 to the user.

  The battery control unit 12 treats the storage battery 4 whose number of changes exceeds the threshold Th as a cautionary storage battery, and thereafter limits the change of the target SOC (S35). For example, for the storage battery 4 to be alerted, control is performed such as prohibiting the change of the target SOC for power failure response or reducing the change width of the target SOC.

  For example, in step S <b> 12 of FIG. 3, the SOC lower limit value is changed only for the storage batteries 4 other than the storage battery 4 to be noted among the storage batteries 4 included in the power storage system 40. For example, in step S <b> 23 of FIG. 8, the upper limit value of the SOC is changed only for the storage batteries 4 other than the target storage battery 4.

  Configuring this embodiment like this also achieves the same operational effects as the first embodiment. Furthermore, in the present embodiment, for the storage battery 4 in which the number of changes of the target SOC is greater than or equal to the threshold, the subsequent change of the target SOC is restricted, so that the deterioration of the storage battery 4 can be suppressed and the reliability is improved.

  In addition, this invention is not limited to embodiment mentioned above. A person skilled in the art can make various additions and changes within the scope of the present invention. In the above-described embodiment, the present invention is not limited to the configuration example illustrated in the accompanying drawings. The configuration and processing method of the embodiment can be changed as appropriate within the scope of achieving the object of the present invention.

  Moreover, each component of the present invention can be arbitrarily selected, and an invention having a selected configuration is also included in the present invention. Further, the configurations described in the claims can be combined with combinations other than those specified in the claims.

  1, 1A, 1B: Power control device, 2: Power system, 3: Power supply line, 4: Storage battery, 5: Load, 6: Switch, 7: Notification unit, 8: External server, 11: Power failure detection unit, 12: Battery control unit, 13: load control unit, 14: load importance management unit, 15: setting unit, 16: external information acquisition unit

Claims (11)

A power control device that controls power supply from a power system or a secondary battery to a plurality of loads,
A power failure detection unit for detecting a power failure in the power system;
A battery control unit for controlling charging and discharging of the secondary battery;
A load control unit for controlling power supply to each load;
With
When the power failure detection unit detects the power failure,
The battery control unit increases the power supply capacity from the secondary battery to each load by changing the target charging rate of the secondary battery,
The load control unit limits power supply to each load.
Power control device. When the power failure detection unit detects a power failure in the power system,
The battery control unit lowers a lower limit charging rate as a target charging rate of the secondary battery from a normal value,
The load control unit limits power supply to a predetermined load specified in advance among the loads.
The power control apparatus according to claim 1. Importance can be set in advance for each load,
The load control unit restricts power supply to the predetermined load, assuming that a load having an importance level equal to or less than a predetermined value is the predetermined load;
The power control apparatus according to claim 2. A setting unit for setting the importance of each load;
The power control apparatus according to claim 1. Each load includes a cooling device for cooling the secondary battery,
The cooling device is set as the predetermined load,
The power control apparatus according to claim 2. Each load can be set to a different importance for each distinction of at least one of the day of the week, season, weather, and time zone.
The power control apparatus according to claim 3. A notification unit for notifying that at least one of the change of the target charging rate of the secondary battery by the battery control unit or the limitation of power supply to each load by the load control unit has been performed; In addition,
The power control apparatus according to claim 1. It further comprises an external information acquisition unit that acquires information from an external information source,
Based on the external information received from the external information acquisition unit by the power failure detection unit, when predicting the occurrence of a power failure in the power system,
The battery control unit is configured to charge the secondary battery by setting an upper limit charging rate as a target charging rate of the secondary battery to be higher than a normal value,
The load control unit limits power supply to a predetermined load specified in advance among the loads.
The power control apparatus according to any one of claims 1 to 7. The battery control unit outputs an alarm for a secondary battery in which the number of times the target charging rate has been changed from a normal value exceeds a predetermined number of times,
The power control apparatus according to claim 1. The battery control unit limits the change of the target charging rate thereafter for the secondary battery in which the number of times of changing the target charging rate from the normal value exceeds a predetermined number of times,
The power control apparatus according to claim 9. A method for controlling power supply from a power system or a secondary battery to a plurality of loads,
A power failure detection step for detecting a power failure in the power system;
A battery control step for controlling charging and discharging of the secondary battery;
A load control step for controlling power supply to each load;
With
When the power failure detection step detects the power failure,
The battery control step increases the power supply capacity from the secondary battery to the loads by changing the target charging rate of the secondary battery,
The load control step limits power supply to each load.
Power control method.

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