JP2009194947A - Charge/discharge depth management device and method, and power storage system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To equalize power loads without shortening the life of a storage battery by relatively deepening the charge/discharge depth of the storage battery according to periods when the demand of electric power is large. <P>SOLUTION: A charge/discharge depth management device 134 is mounted on a power storage system 13 which receives power from a commercial power system to be stored therein, and changes the charge/discharge depth used for charging/discharging the storage battery 132 in the power storage system 13 corresponding to the increase/decrease in the demand of the received power. The charge/discharge depth of the storage battery 132 is relatively deepened with regard to the other period corresponding to the maximum demand period when a demand increase of the received power is estimated, while shortening the period when the storage battery is charged/discharged with a deep charge/discharge depth, to attain high output of the storage battery 132 in the demand increase period. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power storage system introduced to a power user, and more particularly to a charge / discharge depth management device and method for managing the charge depth and discharge depth of a storage battery provided in the power storage system, and the charge / discharge depth management thereof. The present invention relates to a power storage system using the apparatus and method.

  In recent years, a power storage system may be introduced by power users mainly for the purpose of reducing power charges. This power storage system includes a storage battery that can be charged and discharged, charges the storage battery with inexpensive nighttime power, and discharges it in the daytime to carry a part of the load. With the introduction of this power storage system, electricity users can not only benefit from the reduction of pay-for-use charges by partly supplying daytime electricity with midnight power, but also the annual amount of electricity that appears in the midsummer season. You can enjoy the benefits of reducing basic charges by reducing the level of maximum peak power (so-called peak cut). On the other hand, for electric power companies, the peak cut is made in each electric power user, so that there is an advantage that it is possible to ultimately suppress investment in power plant construction and enhancement.

  By the way, as a storage battery mounted in such a power storage system, a secondary battery such as a lithium ion battery, a nickel metal hydride battery, or a lead battery is usually used. Secondary batteries such as lithium ion batteries are light, have high capacity, and high output, and thus are attracting attention as storage batteries for the large-scale power storage system as described above.

  For the secondary battery for the power storage system as described above, it is preferable to make the available capacity as large as possible from the viewpoint of increasing the output. For this reason, the secondary battery is fully charged while being fully charged. It is preferable to discharge. However, a secondary battery such as a lithium ion battery generally has a characteristic that the battery life is shortened when charging and discharging are repeated at a deep depth. For example, FIG. 7 shows the relationship between the allowable number of charges and discharges and the depth of discharge in a general secondary battery. As shown in FIG. 7, it can be seen that as the discharge depth of the battery becomes deeper, the allowable number of times of charge / discharge of the battery decreases.

  Furthermore, in addition to the repetition of charging and discharging at a deep depth as described above, even if the battery is stored for a long time without being discharged after charging at a deep depth, the battery life is similar to the above. It will be shorter.

  On the other hand, in order to ensure the battery life, it is preferable to repeatedly charge and discharge the battery at a shallow depth, as is apparent from FIG. However, when such a method is used, lowering the output of the battery is unavoidable, and as a result, in order to ensure the high output of the battery at a shallow depth, the capacity of the battery is more than necessary. Must be bigger. In other words, there is a trade-off relationship between extending the life and increasing the output of the secondary battery, and the fact is that these two cannot be maximized simultaneously.

  Then, as another method, the following are mentioned, for example. Patent Document 1 discloses a method of changing the charging depth of a battery according to the deterioration level of the secondary battery. In this method, when the secondary battery is charged / discharged, the charge / discharge depth is reduced so that the charge / discharge capacity is reduced while the secondary battery is new, and the charge / discharge capacity is increased as the secondary battery deteriorates. Thus, the decrease in the chargeable / dischargeable capacity of the battery is reduced, and the life of the battery is extended.

  Patent Document 2 discloses a power storage system that reduces the peak of received power by charging a battery at midnight or light load time and discharging it at heavy load time. In this power storage system, the battery is charged / discharged by operating the system only during a predetermined period in which a power peak occurs throughout the year, and the system is stopped or the battery is only supplementally charged during other periods, thereby reducing the cycle life of the battery.

Furthermore, Patent Document 3 discloses a system that extends the life of an apparatus by combining a plurality of small batteries to form a battery module and removing small batteries that have failed during operation.
Japanese Patent Laid-Open No. 9-120843 JP 2000-92741 A JP 2006-50763 A

  However, the method disclosed in Patent Document 1 requires a circuit configuration for measuring the deterioration degree of the secondary battery. As a result, the device configuration becomes complicated and the device cost increases.

  Further, in the system disclosed in Patent Document 2, when a sudden heavy load period occurs during the system stop period, the peak cut cannot be performed for the heavy load period.

  Furthermore, in the system disclosed in Patent Document 3, it is impossible to extend the life of each small battery of the battery module, and a circuit configuration for detecting a faulty battery is required, resulting in a complicated device configuration. This increases the device cost.

  In view of the above problems, an object of the present invention is to increase the capacity of a storage battery in accordance with a period in which there is a large amount of power demand, so that the power load can be leveled without reducing the life of the storage battery. Disclosed is a depth-of-discharge management apparatus and method, and a power storage system.

  In order to achieve the above object, a charge / discharge depth management device according to one aspect of the present invention is mounted on a power storage system that receives power from a commercial power system and is stored by the received power, and stores a storage battery in the power storage system. A charge / discharge depth management device that changes a charge / discharge depth used when charging / discharging according to an increase / decrease in the demand of the received power, and determines a demand increase period in which an increase in demand for the received power is expected to occur. When the first means and the first means determine the demand increase period, the charge / discharge depth of the storage battery used in the determined demand increase period is made relatively deep with respect to other periods. Second means.

  In the above charge / discharge depth management device, when the demand increase period during which the increase in demand for received power is determined, the charge / discharge depth of the storage battery used in the determined demand increase period can be made relatively deep. The output of the storage battery can be increased in accordance with the demand increase period. Furthermore, since the charge / discharge depth is relatively deep according to the demand increase period, and the charge / discharge depth is relatively shallow in other periods, the period during which the storage battery is charged / discharged at the deep charge / discharge depth is relatively short. As a result, the life deterioration of the storage battery due to charging / discharging using a deep charging / discharging depth is suppressed.

  When the demand for the received power is predicted to temporarily decrease and the period that should be excluded from the demand increase period is included in the demand increase period, the second means excludes the received power It is preferable that the charge / discharge depth of the storage battery in the demand increase period excluding the period to be added is relatively deeper than other periods.

  In this case, since the storage battery is charged / discharged at a shallow charge / discharge depth during a period in which the demand for the received power is temporarily reduced, the life deterioration of the storage battery is further suppressed.

  The first means has input means for inputting a demand prediction curve of the received power prepared in advance, and determines the maximum peak period in the demand prediction curve input from the input means as the demand increase period. It is preferable to do.

  In this case, since the storage battery has a high output in the maximum peak period of the demand for received power, the power consumption during the maximum peak period can be reduced. The amount of power used during the maximum peak period has a great influence on the electricity bill. By realizing the reduction, the electricity user can reduce the electricity bill.

  A charge / discharge depth management method according to another aspect of the present invention is a charge / discharge depth used for charging / discharging a storage battery in a power storage system that receives power from a commercial power system and is stored by the received power. A charge / discharge depth management method that changes according to an increase or decrease in demand, the first step of determining a demand increase period in which a demand increase of the received power is predicted to occur, and the demand increase in the first step And a second step of increasing the depth of charge and discharge of the storage battery used in the determined demand increase period relative to other periods when the period is determined.

  In the charge / discharge depth management method described above, when the demand increase period during which the increase in demand for received power is determined, the charge / discharge depth of the storage battery used in the determined demand increase period can be made relatively deep. The output of the storage battery can be increased in accordance with the demand increase period. Furthermore, since the charge / discharge depth is relatively deep according to the demand increase period, and the charge / discharge depth is relatively shallow in other periods, the period during which the storage battery is charged / discharged at the deep charge / discharge depth is relatively short. As a result, the life deterioration of the storage battery due to charging / discharging using a deep charging / discharging depth is suppressed.

  A power storage system according to still another aspect of the present invention is a power storage system that receives power from a commercial power system and stores power by the received power, and has a storage battery and a charge / discharge depth used when charging / discharging the storage battery. A charge / discharge depth management device that changes according to an increase or decrease in demand for the received power, and a charge / discharge control device that charges / discharges the storage battery using the charge / discharge depth of the storage battery given from the charge / discharge depth management device. The charge / discharge depth management device has a first means for determining a demand increase period in which a demand increase of the received power is predicted to occur, and when the first means determines the demand increase period, And a second means for deepening the charge / discharge depth of the storage battery in the determined demand increase period relative to other periods.

  In the above power storage system, when a demand increase period in which a demand increase in received power is determined, the charge / discharge depth of the storage battery used in the determined demand increase period can be relatively deepened, so the demand increases The output of the storage battery can be increased in accordance with the period. Furthermore, since the charge / discharge depth is relatively deep according to the demand increase period, and the charge / discharge depth is relatively shallow in other periods, the period during which the storage battery is charged / discharged at the deep charge / discharge depth is relatively short. As a result, the life deterioration of the storage battery due to charging / discharging using a deep charging / discharging depth is suppressed.

  According to the present invention, a charge / discharge depth management device and method capable of leveling a power load without increasing the storage battery capacity by increasing the capacity of the storage battery in accordance with a period during which there is a large amount of power demand. In addition, a power storage system can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar elements are denoted by the same or similar reference numerals, and description thereof may be omitted.

  FIG. 1 is a block diagram showing a schematic configuration of power equipment for a power user in which a power storage system according to an embodiment of the present invention is installed. The power facility 10 in which the power storage system 13 according to the present embodiment is installed is a power facility for users of high-voltage power such as a factory, and includes a power receiving facility 11, loads 12A, 12B, 12C, a power storage system 13, It is equipped with.

  The power receiving facility 11 is a facility for a power user to receive power from a commercial power system, and includes a transformer, a switch, and the like. The loads 12A, 12B, and 12C are various electric devices that consume power, such as an electric motor, an electric furnace, an air conditioning facility, and an electric lamp. The loads 12 </ b> A, 12 </ b> B, and 12 </ b> C are normally operated by being supplied with power from the commercial power system via the power receiving facility 11.

  The power storage system 13 according to the present embodiment is connected to the power receiving facility 11 and the loads 12A, 12B, and 12C, and is charged with commercial power, and has a function of supplying power to the loads 12A, 12B, and 12C. As shown in FIG. 1, the power storage system 13 includes an AC / DC converter 131, a storage battery 132, a charge / discharge control device 133, and a charge / discharge depth management device 134.

  The AC / DC converter 131 includes a rectifier and the like, converts AC commercial power of 50 Hz / 60 Hz into DC power, and converts DC power discharged from the storage battery 132 into AC power. The storage battery 132 is a secondary battery that can be repeatedly charged and discharged, and is charged with commercial power, while discharging the charged power and supplying power to the loads 12A, 12B, and 12C.

  The charge / discharge control device 133 performs control to switch the operation mode of the AC / DC converter 131 and the storage battery 132 to either the charge mode or the discharge mode. For example, the charge / discharge control device 133 performs control to switch the storage battery 132 so that the storage battery 132 is charged during the midnight power hours and is discharged mainly during the daytime power peak hours.

  Furthermore, when charging / discharging the storage battery 132, the charging / discharging control device 133 combines the charging depth and the discharging depth of the storage battery 132 managed by the charging / discharging depth management apparatus 134, which is a characteristic part of the present invention (hereinafter, these two are combined). May also be referred to as “charge / discharge depth”). That is, the charge / discharge control device 133 charges the storage battery 132 to the charge depth given from the charge / discharge depth management device 134, while discharging the storage battery 132 to the discharge depth given from the charge / discharge depth management device 134.

  Here, in the present embodiment, the charging depth refers to the ratio of the capacity of the storage battery 132 that is actually charged with respect to the full charge capacity of the storage battery 132, for example, the full charge capacity of the storage battery 132. Is 100 kWh, and when the actually charged capacity is 90 kWh, the charging depth of the storage battery 132 in that case is 90%. Further, if the charged capacity is 70 kWh, the charging depth is 70%. On the other hand, the discharge depth refers to the ratio of the capacity of the storage battery 132 that is actually discharged to the full charge capacity of the storage battery 132. For example, when the full charge capacity of the storage battery 132 is 100 kWh, When the capacity discharged to 90 kWh is 90 kWh, the depth of discharge of the storage battery 132 in that case is 90%. Further, if the discharged capacity is 70 kWh, the discharge depth is 70%. In both cases of the charge depth and the discharge depth, the depth becomes deeper as it approaches 100%, and the depth becomes shallower as it approaches 0%. For example, when charging / discharging of the storage battery 132 is repeated at a charge depth of 90%, a discharge depth of 90%, that is, a deep charge / discharge depth of 90%, the capacity of the storage battery 132 is 10 to 90% with respect to the full charge capacity. It will shift in the range of. In addition, when charging / discharging of the storage battery 132 is repeated at a charging depth of 70%, a discharge depth of 70%, that is, a shallow charging / discharging depth of 70%, the capacity of the storage battery 132 is 30 to 70% of the full charge capacity. It will shift in the range of.

  Next, the charge / discharge depth management device 134 which is a characteristic part of the present invention will be described. First, the principle of the charge / discharge depth management device 134 will be described, and then the configuration and operation of the charge / discharge depth management device 134 will be described in detail. As described above, the charge / discharge depth management device 134 is for changing and managing the charge depth and discharge depth of the storage battery 132 used when the charge / discharge control device 133 charges / discharges the storage battery 132.

  As described above in the section of the background art, when charging / discharging of the storage battery 132 is repeated, there is a trade-off relationship between the battery life and the output of the storage battery 132. That is, if the charging / discharging depth is set shallow so that the life of the storage battery 132 can be extended, the output of the storage battery 132 decreases. Conversely, if the depth of charge / discharge is set so as to increase the output of the storage battery 132, the life of the storage battery 132 will be deteriorated.

  On the other hand, the annual power demand of power users generally peaks during a specific period such as several weeks in summer. Therefore, if the storage battery 132 has a high output at least during this specific period, the peak cut for the peak demand in this specific period can be executed. On the contrary, it can be said that there is no problem even if the output of the storage battery 132 decreases during the period excluding this specific period.

  Therefore, the charge / discharge depth management device 134 according to the present embodiment changes the charge / discharge depth of the storage battery 132 given to the charge / discharge control device 133 in accordance with the annual power demand of the power user, thereby While the output of the storage battery 132 is increased in accordance with the peak period, the output of the storage battery 132 is reduced during other periods, and the deterioration of the battery life of the storage battery 132 is suppressed. That is, according to the charge / discharge depth management device 134 according to the present embodiment, the lifetime that is a factor of the lifetime deterioration of the storage battery 132 is minimized to suppress the lifetime deterioration, and according to the peak period of the user's power demand. The peak cut can be executed.

  Next, the configuration and operation of the charge / discharge depth management device 134 will be described. FIG. 2 is a block diagram showing a schematic configuration of the charge / discharge depth management device 134 according to the present embodiment. As shown in FIG. 2, the charge / discharge depth management device 134 according to the present embodiment includes a demand prediction curve input unit 21, an analysis unit 22, an optimization unit 23, an individual information input unit 24, and a storage unit 25. And a setting unit 26.

  The demand prediction curve input unit 21 receives a power user's annual power demand prediction curve serving as basic data for changing and managing the charge / discharge depth of the storage battery 132 applied to the charge / discharge control device 133. . FIG. 5 shows an example of the demand prediction curve. In the demand prediction curve A1 shown in FIG. 5, it is a period (heavy load period) of the annual maximum peak demand in which the period B exceeds the limit power C. For example, the demand prediction curve may be created based on the results of the previous fiscal year, or may be predicted from forecast weather information or the like.

  In general, the current power charge system for general high-voltage power users consists of a sum of a predetermined basic charge and a pay-per-use charge corresponding to the amount of power used. The basic fee is determined by the maximum peak demand for the past year (January and the previous 11 months). That is, if there is a power usage record that exceeds the limit power even in a short period of the year, the basic charge for the next year will be set accordingly. Therefore, it can be said that the magnitude of the annual maximum peak demand has a great influence on the electricity rate. For example, in the example of FIG. 5, there is a maximum peak demand that exceeds the limited power C in the period B, but the peak charge is cut using the power storage system 10 to reduce the power charge (basic charge). The

  Returning to FIG. 2, the analysis unit 22 analyzes the demand prediction curve input by the demand prediction curve input unit 21 and determines the period of the maximum peak demand. Specifically, the analysis part 22 acquires a demand prediction curve from the demand prediction curve input part 21, and determines the period of the maximum peak demand as a heavy load period based on the demand prediction curve. For example, when the demand prediction curve A1 shown in FIG. 5 is input, the period B (July to August) is determined as the heavy load period. In the present embodiment, a demand prediction curve is input to the demand prediction curve input unit 21, and the analysis unit 22 determines the heavy load period based on the demand prediction curve. However, the present invention is limited to this. It is not a thing. For example, the power user or the power company may set a period that should be a heavy load period in advance, and the analysis unit 22 may determine the set period as the heavy load period as it is.

  The optimization unit 23 optimizes the charge / discharge depth of the storage battery 132 used when charging / discharging the storage battery 132 in the heavy load period determined by the analysis unit 22. Specifically, the optimization unit 23 determines how to change the charge / discharge depth of the storage battery 132 in the heavy load period. For example, the optimization unit 23 changes the charge / discharge depth of the storage battery 132 as follows.

  Since the heavy load period is a period of maximum peak demand, basically, in the heavy load period, it is necessary to increase the charge / discharge depth of the storage battery 132 and increase the output of the storage battery 132. . However, the optimization unit 23 further does not need to deepen the charge / discharge depth of the storage battery 132 in the heavy load period, that is, if there is a period during which the power demand temporarily decreases, The depth of charge / discharge of the storage battery 132 is made shallower. In this way, the optimization unit 23 determines the charge / discharge depth of the storage battery 132 during the heavy load period and stores it in the storage unit 25.

  The individual information input unit 24 is used to input individual information used when the optimization unit 23 optimizes the change in the charge / discharge depth of the storage battery 132 during the heavy load period. The optimization unit 23 takes into account the individual information input by the individual information input unit 24 and optimizes the change in the charge / discharge depth of the storage battery 132 during the heavy load period. The individual information input unit 24 outputs the individual information to the optimization unit 23 when the individual information is input by, for example, a power user or a power company.

  Here, the individual information is, for example, information indicating weekends and holidays that are holidays, and a Bon period that is a homecoming season in the midsummer period of July to August, which is the period of maximum peak demand. In these periods, it is expected that the power demand will temporarily decrease even in the midsummer season from July to August. FIG. 6 shows an example of a demand prediction curve near the tray period. In the demand prediction curve A2 shown in FIG. 6, the power demand is large in the period D1 before the basin period D2 (13 to 15 days) and the period D3 after the basin period D2, and the power demand temporarily decreases in the basin period D2. Yes. Therefore, in the tray period D2, there is no problem even if the charge / discharge depth of the storage battery 132 is reduced and the output of the storage battery 132 is reduced. Furthermore, if there is a period during which it is clear that the power demand will increase further for some reason even during the period in which the power demand such as the tray period D2 is expected to decrease temporarily, the charging of the storage battery 132 will be performed during that period. The discharge depth is increased and the high output of the storage battery 132 is maintained.

  As described above, the storage unit 25 is a storage device for storing the charge / discharge depth of the storage battery 132 determined by the optimization unit 23. The storage unit 25 stores the charge / discharge depth of the storage battery 132 in the period excluding the heavy load period in addition to the charge / discharge depth of the storage battery 132 in the heavy load period optimized by the optimization unit 23. The charge / discharge depth of the storage battery 132 during the period excluding the heavy load period may be stored in the storage unit 25 in advance, or when the charge / discharge depth during the heavy load period is optimized, the optimization unit 23 may be stored in the storage unit 25.

  The setting unit 26 is for acquiring the charge / discharge depth of the storage battery 132 from the storage unit 25 as appropriate and giving it to the charge / discharge control device 133. Specifically, the setting unit 26 acquires the charge / discharge depth of the storage battery 132 stored in the storage unit 25 from the storage unit 25 in accordance with the time when each should be set. After the acquisition, the setting unit 26 gives the charge / discharge depth to the charge / discharge control unit 133, and the charge / discharge control unit 133 performs charge / discharge of the storage battery 132 based on the given charge / discharge depth.

  Next, the operation of the charge / discharge depth management device 134 according to the present embodiment will be described. FIG. 3 is a flowchart showing a processing procedure of the charge / discharge depth management method according to the present embodiment. As shown in FIG. 3, first, for example, when a demand prediction curve is input to the demand prediction curve input unit 21 by a power user or a power company (step S101), the analysis of the input demand prediction curve is performed by the analysis unit 22. (Step S102).

  Subsequently, for example, when individual information is input to the individual information input unit 24 by a power user or a power company (step S103), the individual information input in step S103 and the result analyzed in step S102 described above The optimization unit 23 optimizes the charge / discharge depth of the storage battery 132 (step S104). Note that the optimization process executed in step S104 will be described later.

  Finally, the charge / discharge depth of the storage battery 132 optimized in the above step S104 is stored in the storage unit 25 and then given to the charge / discharge control device 133 by the setting unit 26 and set ( Step S105).

  Next, the optimization procedure in step S104 of FIG. 3 will be described using a specific example. FIG. 4 is a flowchart showing the optimization processing procedure in step S104 of FIG. Here, the period of maximum peak demand is the midsummer period of July to August, and power demand is expected to decrease temporarily during weekends and holidays, which are holidays during that period, and during the Bon Festival, which is the homecoming season. The case where there is a day when it is clear that the power demand will increase during the tray period will be described.

  As shown in FIG. 4, first, when the demand prediction curve is analyzed by the analysis unit 22 and the heavy load period that is the maximum peak demand period is determined, the months within the heavy load period are overlapped by the optimization unit 23. It is determined as a load month (step S201).

  Subsequently, the individual information input by the individual information input unit 24 is taken into account, and weekends and holidays that are expected to temporarily reduce the power demand are determined by the optimization unit 23 as excluded days (step S202). Thus, a tray period in which the power demand is expected to decrease temporarily is determined as an exclusion date (step S203). Furthermore, the day on which it is clear that the power demand increases among the excluded days is determined as the additional day (step S204).

  Subsequently, the heavy load month determined in the above step S201, the exclusion day determined in the above step S202, the exclusion date determined in the above step S203, and the additional date determined in the above step S204. Based on this, the optimization unit 23 determines the day when the storage battery 132 should be deepened by increasing the charge / discharge depth of the storage battery 132 as a heavy load day (step S205).

  Subsequently, the charge / discharge depth of the storage battery 132 on the heavy load date determined in step S205 is determined as the first charge / discharge depth by the optimization unit 23 (step S206). Similarly, other than the above heavy load date The charge / discharge depth of the storage battery 132 on that day is determined as the second charge / discharge depth by the optimization unit 23 (step S207). Finally, the first charge / discharge depth and the second charge / discharge depth are stored in the storage unit 25 by the optimization unit 23 (step S208).

  As described above, according to the embodiment of the present invention, the life of the storage battery is extended by charging / discharging at a shallow charge / discharge depth in a period in which the power demand is low, and the charge / discharge depth is adjusted in accordance with the period in which the power demand is high. By increasing the depth, the output of the storage battery can be increased. By doing so, leveling of the electric power load can be realized without causing the life of the storage battery to be shortened.

It is a block diagram which shows schematic structure of the electric power installation with which the electrical storage system which concerns on embodiment of this invention was installed. It is a block diagram which shows schematic structure of the charging / discharging depth management apparatus which concerns on embodiment of this invention. It is a flowchart which shows the process sequence of the charging / discharging depth management method which concerns on embodiment of this invention. It is a flowchart which shows the process sequence of the optimization in step S104 of FIG. It is a figure which shows an example of a demand prediction curve. It is a figure which shows another example of a demand prediction curve. It is a figure which shows the relationship between the frequency | count of permissible charge / discharge in a general secondary battery, and the depth of discharge.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electric power equipment 11 Power receiving equipment 12A, 12B, 12C Load 13 Power storage system 21 Demand prediction curve input part 22 Analysis part 23 Optimization part 24 Individual information input part 25 Storage part 26 Setting part 131 AC / DC converter 132 Storage battery 133 Charging / discharging Control device 134 Charge / discharge depth management device

Claims (5)

The charging / discharging depth used when charging / discharging the storage battery in the power storage system is mounted on the power storage system that receives power from the commercial power system and is stored by the received power according to the increase / decrease in the demand of the received power A charge / discharge depth management device that changes,
A first means for determining a demand increase period during which a demand increase of the received power is expected to occur;
When the first means determines the demand increase period, second means for making the charge / discharge depth of the storage battery used in the determined demand increase period relatively deeper than other periods; A charge / discharge depth management device comprising:   When the demand for the received power is predicted to temporarily decrease and the period that should be excluded from the demand increase period is included in the demand increase period, the second means excludes the received power The charge / discharge depth management device according to claim 1, wherein a charge / discharge depth of the storage battery in the demand increase period excluding a period to be increased is relatively deep with respect to other periods.   The first means has input means for inputting a demand prediction curve of the received power prepared in advance, and determines the maximum peak period in the demand prediction curve input from the input means as the demand increase period. The charge / discharge depth management apparatus according to claim 1 or 2, wherein A charge / discharge depth management method for changing a charge / discharge depth used when charging / discharging a storage battery in a power storage system that receives power from a commercial power system and is stored by the received power according to an increase or decrease in demand for the received power. And
A first step of determining a demand increase period in which a demand increase of the received power is predicted to occur;
A second step of deepening the charge / discharge depth of the storage battery used in the determined demand increase period relative to other periods when the demand increase period is determined in the first step; A charge / discharge depth management method comprising: A power storage system that receives power from a commercial power system and stores power by the received power,
A storage battery,
A charge / discharge depth management device that changes a charge / discharge depth used when charging / discharging the storage battery according to an increase / decrease in the demand of the received power; and
A charge / discharge control device for charging / discharging the storage battery using a charge / discharge depth of the storage battery given from the charge / discharge depth management device;
The charge / discharge depth management device determines the demand increase period when it is predicted that the demand increase of the received power will occur, and the determination is performed when the first means determines the demand increase period. And a second means for deepening the charging / discharging depth of the storage battery in the demand increase period relative to other periods.

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