JP6464247B2 - Power management apparatus, power management system, and power management method - Google Patents

Description

  The present invention relates to a power management apparatus, a power management system, and a power management method.

  Conventionally, for example, storage batteries have been used in power systems for the following reasons. First, when power generated by a power generation device such as solar power generation or wind power generation is supplied to the power system, the power generation amount fluctuates depending on weather conditions such as weather or wind power, and it is difficult to secure a stable supply amount. It is possible that Second, if a power producer and supplier (PPS) supplies power to the power system and there is a significant excess or deficiency in supply compared to the pre-planned value, the PPS will be financially There is a possibility of loss. Specifically, if the supply amount exceeds 3% of the pre-planned value, the surplus will be taken over to the general electric utility without charge, and if the supply amount falls below 3% of the pre-planned value, the shortage will generally be It must be purchased from an electric utility company at a price approximately three times the normal electricity bill. Thirdly, the standard within the demand time limit (mainly time unit used for transactions with electric power companies, generally 30 minute intervals) when the customer responds to demand response requests. If the value cannot be kept below the limit, the consumer may have to pay a penalty fee to the general electric utility.

  By the way, as a first background art, a technique of using a plurality of storage batteries in order to control charge / discharge power is known.

  As a first background for using the first background art, in the case of a storage battery in which charge / discharge power cannot be specified, the charge / discharge power amount is finer when using multiple storage batteries than when using only one storage battery. This is because it can be controlled.

  As a specific example, FIG. 1 shows the maximum charge / discharge power amount and the minimum charge / discharge power amount for each storage battery used. From FIG. 1, for example, when the power amount of 400 Wh must be satisfied for the demand time limit of 30 minutes, in the case of A, charging / discharging of 164 × 3 = 492 Wh is performed by charging / discharging for 3 minutes. Thus, a difference of 92 Wh is generated. On the other hand, in the case of B, since charging / discharging is performed with 2 units for the first 2 minutes and 1 unit for the remaining 1 minute in charging / discharging for 3 minutes, 164 × 2 + 82 × 1 = 410 Wh is charged by charging / discharging for 3 minutes. Discharge occurs. In this case, it is only necessary to generate a power difference of 10 Wh with respect to 400 Wh.

  The second background of using the first background technology is that when power supply and demand adjustment is performed using only one storage battery, there is no rated power storage battery that matches the intended use. This is because there is a possibility that the introduction cost of the storage battery may be higher than when a plurality of small storage batteries are used in combination. For example, if the optimum rated output of a storage battery used for supply and demand adjustment is 5.0 kW, and the product lineup has only rated output 2.5 kW, 4.0 kW and 10.0 kW storage batteries, a 10.0 kW storage battery The cost of introduction can be reduced by purchasing two 2.5 kW ones rather than purchasing one.

  As a third background to using the first background art, compared to the case of using one storage battery, the use of two batteries increases the amount of charge / discharge power for the same time, and the charge / discharge time is shortened. Because. For example, when it is necessary to discharge 82 Wh of electric energy, when one storage battery with an output of 2.5 kW is used, it is completed in 2 minutes, whereas when two batteries are used, it is completed in half in one minute. It will take less time.

  On the other hand, as a second and third background art, a technique is known in which charge / discharge control content of a storage battery system is determined using a plurality of storage batteries one by one (for example, Patent Document 1 and Patent Document 2). In Patent Literature 1, a storage battery to be used is switched for a plurality of storage batteries connected to an electric power system according to the SOC (state of charge) status of each storage battery. In Patent Document 2, for a plurality of storage batteries connected to an electric power system, the storage battery to be used is switched according to the SOC and SOH (SOC: State Of Health) of each storage battery.

JP 2013-106372 A JP 2013-192327 A

  However, when using a plurality of storage batteries at the same time as in the first background art, there is a possibility that a remaining amount difference occurs between the storage batteries due to a storage battery connection error or the like. When the remaining amount difference occurs, the simultaneous charge / discharge time by the plurality of storage batteries decreases as the remaining amount difference increases, and the supply and demand adjustment amount may be insufficient. With respect to this problem, in Patent Documents 1 and 2 (second and third background art), since the storage battery to be used is switched according to the SOC and SOH status of the storage battery, the difference in remaining amount between the storage batteries is suppressed. . However, since the storage batteries are used one by one, when the required supply / demand adjustment power amount exceeding the rated output is obtained within the demand time limit, there is a possibility that the supply / demand adjustment amount is insufficient. A specific example where the supply and demand adjustment amount is insufficient is shown below. The required supply and demand adjustment electric energy is the charge / discharge electric energy of the storage battery for adjusting the electric energy used within the demand time limit to the planned value. Specifically, it represents the amount of charge / discharge power of the storage battery required to match the predicted power amount used between the current time and the next demand time limit start time with the pre-planned value.

  As a specific example, two storage batteries (storage battery 1 and storage battery 2) are connected, and when the SOC of the storage battery 1 is 50% and the SOC of the storage battery 2 is 40%, a discharge operation that reduces the SOC by 65% is required. In this case, there is only 5 minutes remaining with respect to the demand time limit, and as a performance of the storage battery, it takes 1 minute to discharge SOC 10%. In this specific example, if one storage battery is used one by one, a total discharge time of 6.5 minutes is theoretically required, but the switching timing of the charge / discharge operation of the storage battery is considered once per minute. Therefore (because measurement data is collected once per minute), the time required for the actual discharge operation is 6 minutes (or 7 minutes). Therefore, it is not possible to reduce the power usage amount within the demand time limit to the reduction target value within the time, and there is a possibility that a penalty fee is generated for the consumer.

  On the other hand, when priority is given to supply and demand adjustment and the remaining amount difference correction process is performed to suppress the occurrence of the remaining amount difference, the remaining number difference correction process increases the cumulative number of cycles of the storage battery. Performance degradation (decrease in overall battery capacity) may be promoted. In addition, due to the execution of the correction process, the simultaneous charge / discharge time by a plurality of storage batteries may be reduced, and supply and demand adjustment may not be in time. Regarding the problem that occurs when the remaining amount difference correction process is performed, two storage batteries (storage battery 1 and storage battery 2) are connected as a specific example, and the SOC of storage battery 1 is 30% and the SOC of storage battery 2 is 80%. Some cases are shown below.

  The first specific example is a problem that occurs when a method of adjusting to an intermediate value of the remaining amount difference is performed. The storage battery 1 is charged and the storage battery 2 is discharged so that the SOC of both the storage battery 1 and the storage battery 2 is 55%. At this time, it is necessary to adjust the supply and demand within the demand time limit separately from the remaining amount difference correction process, and the time that can be used for the supply and demand adjustment is reduced by the execution of this remaining amount difference correction process, so the supply and demand adjustment may not be in time There is sex. In addition, when switching from one storage battery (storage battery 1 or storage battery 2) to two (both storage battery 1 and storage battery 2), the number of cycles increases for storage battery 1 and storage battery 2 separately from supply and demand adjustment. Degradation may be accelerated.

  The second specific example is a problem that occurs when a method of matching a specific remaining battery level is performed. It is assumed that only the storage battery 1 is charged so that the SOC of the storage battery 1 is 80% (or only the storage battery 2 is discharged so that the SOC of the storage battery 2 is 30%). When the power storage control content (charge or discharge) for supply and demand adjustment does not match the power storage control content (charge or discharge) by the remaining amount difference correction process, the required supply and demand adjustment power amount within the demand time limit increases due to the correction process, There is a possibility that supply and demand adjustment will not be in time. Further, even when the power storage control contents match and only a specific storage battery (storage battery 1 or storage battery 2) is used for the remaining amount difference correction process, there is a possibility that the number of cycles of storage battery 1 or storage battery 2 will be consumed excessively. is there.

  An object of the present invention made in view of such points is to generate a difference in remaining amount between storage batteries, a shortage of supply / demand adjustment amount within a demand time period generated by the remaining amount difference correction process, and a deterioration of the storage battery caused by the remaining amount difference correction process. It is an object of the present invention to provide a power management apparatus, a power management system, and a power management method that can suppress the above.

In order to solve the above problems, the power management device according to the present invention can control a plurality of storage batteries. In the case where the power management device receives a request for power supply and demand adjustment, and the power supply and demand adjustment power amount in the demand time period is smaller than the power amount capable of charging and discharging the plurality of storage batteries in the demand time period. The charge / discharge of the plurality of storage batteries is controlled using the remaining amount and deterioration information of the plurality of storage batteries so as to suppress a difference in remaining amount between the plurality of storage batteries.

  Moreover, in order to solve the said subject, the power management apparatus which concerns on this invention determines the control method of charging / discharging of these several storage battery based on measurement data and a prior plan value.

  Moreover, in order to solve the said subject, when charging the said some storage battery, the power management apparatus which concerns on this invention preferentially charges the storage battery with few residual amounts among these several storage batteries, The said some storage battery When discharging the battery, the storage battery having a large remaining amount is preferentially discharged among the plurality of storage batteries.

Furthermore, in order to solve the said subject, the power management system which concerns on this invention contains a some storage battery and the power management apparatus which can control the said some storage battery. When the power supply / demand adjustment request is received and the supply / demand adjustment power amount in the demand time period is smaller than the power amount that can be charged / discharged of the plurality of storage batteries in the demand time period, the power management device The charge / discharge of the plurality of storage batteries is controlled using the remaining amount and deterioration information of the plurality of storage batteries so as to suppress a difference in remaining amount between the plurality of storage batteries.

  Moreover, in order to solve the said subject, in the power management system which concerns on this invention, when charging the said some storage battery, the said power management apparatus preferentially charges the storage battery with few residual amounts among these storage batteries. When the plurality of storage batteries are discharged, among the plurality of storage batteries, a storage battery having a large remaining amount is preferentially discharged.

Furthermore, in order to solve the said subject, the power management method which concerns on this invention is a power management method in the power management apparatus which can control a some storage battery. In the power management method, when a demand for power supply and demand adjustment is received, whether or not the power supply and demand adjustment power amount in the demand time period is smaller than the power amount that can be charged and discharged in the plurality of storage batteries in the demand time period. A determination step of determining. The power management method uses the remaining amount and deterioration information of the plurality of storage batteries when the supply / demand adjustment amount of power is determined to be smaller than the amount of power that can be charged and discharged. A control step of controlling charging / discharging of the plurality of storage batteries so as to suppress a difference in remaining amount between them.

  Moreover, in order to solve the said subject, in the said control step, the power management method which concerns on this invention preferentially charges a storage battery with few residual amounts among these storage batteries, when charging these storage batteries. When discharging the plurality of storage batteries, among the plurality of storage batteries, a storage battery with a large remaining amount is preferentially discharged.

  ADVANTAGE OF THE INVENTION According to this invention, the remaining amount difference between storage batteries, the shortage of the supply-demand adjustment amount within a demand time period which arises by residual amount difference correction processing, and the deterioration of the storage battery which arises by residual amount difference correction processing can be suppressed. .

It is a figure which shows the maximum charging / discharging electric energy by storage battery use number, and the minimum charging / discharging electric energy. It is a figure showing a schematic structure of a power management system concerning one embodiment of the present invention. It is a functional block diagram of power management device 1 concerning one embodiment of the present invention. It is a functional block diagram of storage battery system 2 concerning one embodiment of the present invention. It is a figure which shows the operation | movement flow of the electrical storage control content setting process of the power management apparatus 1 which concerns on one Embodiment of this invention. It is a figure which shows the operation | movement flow of the residual amount difference correction implementation determination process of the power management apparatus 1 which concerns on one Embodiment of this invention. It is a figure which shows the SOC (residual amount) condition of the storage battery 1 and the storage battery 2 which concerns on one Embodiment of this invention. It is a figure which shows the operation | movement flow of the residual amount difference correction implementation process of the power management apparatus 1 which concerns on one Embodiment of this invention. It is a figure which shows the relationship between the time in the residual amount difference correction implementation process of the power management apparatus 1 which concerns on one Embodiment of this invention, and charging / discharging electric energy.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[System configuration]
This power management system is mainly composed of a device that manages electrical energy used in the power system on the demand side or the supply side with respect to the power system, and a plurality of storage batteries connected to the power system. The system also includes a power load disposed at the consumer. The storage battery is used, for example, for the consumer to adjust the supply and demand of the amount of demand power used in the power system with respect to the demand time limit. Note that the configuration range of this system is grid connection or independent operation, and connection to network devices via Network 5 is arbitrary.

  FIG. 2A is a diagram showing a schematic configuration of a power management system according to an embodiment of the present invention. In the present embodiment, a power management device 1, a storage battery system 2, a power generation device control system 3, a power generation device 4, a network 5, and a power system 6 are connected. The storage battery system 2 has one or more storage battery systems of storage battery system_1 2a, storage battery system_2 2b... Storage battery system_n 2n. The power generation equipment 4 includes one or more power generation equipments of power generation equipment_1 4a, power generation equipment_2 4b, and power generation equipment_m 4m.

  Hereinafter, the configurations of the power management apparatus 1 and the storage battery system 2 will be described more specifically.

  FIG. 2B is a functional block diagram of the power management apparatus 1 according to an embodiment of the present invention. The power management apparatus 1 is connected to a power network, and includes a control unit 11, a communication unit 12, a control type determination unit 13, a control content setting unit 14, a control type determination unit 15, and a remaining amount difference correction execution determination unit 16. And a calculation unit 17, a remaining amount difference correction execution processing unit 18, and a storage unit 19. Each function of the power management apparatus 1 according to the present invention will be described, but it should be noted that it is not intended to exclude other functions of the power management apparatus 1. The power management apparatus 1 can be configured as a computer. The power management apparatus 1 stores a program describing processing contents for realizing each function from the control unit 11 to the remaining amount difference correction execution processing unit 18 in the storage unit 19 of the computer, and the central processing unit of the computer This can be realized by reading and executing this program by the (CPU).

  The control unit 11 controls various operations of the power management apparatus 1. For example, the control unit 11 causes the calculation unit 17 to calculate the charge / discharge time by one storage battery. In addition, the control unit 11 controls the storage battery 22 by transmitting the control content determined by the remaining amount difference correction execution processing unit 18 to the storage battery 22 via the communication unit 12.

  The communication unit 12 communicates with the storage battery system 2, the power generation device control system 3, the network 5, the power system 6, and the like.

  The control type determination unit 13 calculates the power target value from the current time to the demand time limit based on the acquired measurement data and the pre-planned value, and determines the power storage control type (charging, discharging, or standby state) simultaneously with the power calculation. .

  The control content setting unit 14 compares the “required power supply / demand adjustment power amount from the current time to the demand time limit (required power supply / demand adjustment power amount for each demand time period)” and the “chargeable / dischargeable power amount from the current time to the demand time limit”. If the former is smaller, the power storage control content is set to the standby state. On the other hand, if the former is greater than or equal to the latter, the power storage control content is set to match the power storage control type determined by the control type determination unit 13.

  The control type determination unit 15 determines the power storage control type from the current time to the demand time limit.

  The remaining amount difference correction execution determination unit 16 provisionally determines the power storage control content according to the control type, the storage battery SOC state, the total number of cycles, and the like. Further, the remaining amount difference correction execution determination unit 16 determines that “Psd: required supply and demand adjustment electric energy from the current time to the demand time limit” and “(Pout / 60) (td−tn−tm): from the current time to the demand time limit. The chargeable / dischargeable power amount when two storage batteries are used in between is compared. If the former is smaller than the latter, it is determined that the remaining amount difference correction is performed. Pout is the sum of the outputs of all the storage batteries (two in this embodiment), that is, the sum of the rated output (Pout_1) of the storage battery 1 and the rated output of the storage battery 2 (Pout_2). The rated output is the rated output per hour. td is the demand time period, tn is the current time, and tm is the blank time.

  The calculation part 17 calculates charge / discharge time t1 [min] by one storage battery. t1 is a charge / discharge time calculated to satisfy the remaining amount difference suppression and satisfy the required supply / demand adjustment power amount (match the charge / discharge power amount with the required supply / demand adjustment power amount). The formula for calculating t1 will be described later.

  The remaining amount difference correction execution processing unit 18 performs charging when “ΔP: chargeable / dischargeable electric energy necessary to fill the remaining amount difference” and “(Pout_use / 60) t1: t1 [min] storage battery” are used. The “dischargeable electric energy” is compared, and it is determined whether charging / discharging of each storage battery is started at the current time. When the former is smaller than the latter, the remaining amount difference correction execution processing unit 18 changes the storage control content of the storage battery 1 and the storage battery 2 to a standby state (Wait). On the other hand, when the former is greater than or equal to the latter, the remaining amount difference correction execution processing unit 18 sets the temporarily determined power storage control content as the final determination, and further changes the control content of the unused storage battery to the standby state (Wait).

  The storage unit 19 stores, for example, measurement data, provisionally determined power storage control content, and the like as information necessary for performing the processing of each unit described above.

  FIG. 2C is a functional block diagram of the storage battery system 2 according to one embodiment of the present invention. The storage battery system 2 includes a PCS (Power Conditioning System) 21 and a storage battery 22. The storage battery system 2 is used, for example, for the consumer to adjust the supply and demand of the power demand used in the power system 6 for each demand period. Although each function of the storage battery system 2 according to the present invention will be described, it should be noted that it is not intended to exclude other functions of the storage battery system 2.

  The number of functional blocks described above is not limited to one, and a plurality of functional blocks may be provided to divide the processing. Some of the functional blocks may be integrated.

[Storage control content setting process]
FIG. 3 is a diagram illustrating an operation flow of the power storage control content setting process of the power management apparatus 1. This process generally determines whether to start charging / discharging of all the connected batteries at the current time after determining the target value and the power storage control type from the current time to the demand time limit based on the measurement data. It is processing. The power storage control content setting process is performed every minute in accordance with, for example, the measurement data reading cycle being one minute.

  Referring to FIG. 3, the control type determination unit 13 of the power management apparatus 1 reads measurement data such as PV (PhotoVoltics), a remaining battery level (SOC), or a watt hour meter (Step S <b> 1). The measurement data reading cycle is, for example, one minute, but is not limited thereto. Next, the control type determination unit 13 calculates a power target value from the current time to the demand time limit based on the acquired measurement data and the pre-planned value, and determines the power storage control type simultaneously with the calculation (step S2).

  The power storage control type is a method for controlling the storage battery from the current time to the demand time limit, and specifically, is at least one of charge, discharge, and standby state (Wait). The power storage control type is assumed as a case where it is not necessary to start charging / discharging from the current time, and thus is prepared as a control method different from the power storage control content.

  The control content setting unit 14 compares the “required power supply / demand adjustment power amount from the current time to the demand time limit” and the “chargeable / dischargeable power amount from the current time to the demand time limit”, and if the former is smaller, the power storage control content Is set to a standby state (step S3). On the other hand, if the former is greater than or equal to the latter, the control content setting unit 14 matches the power storage control content with the power storage control type determined in step S2 (step S3). The power storage control content is a storage battery control method for one minute from the current time, and is at least one of charge, discharge, and standby state. The storage control content is notified to the storage battery system 2 via the communication unit 12, and as a result, the storage battery system 2 is controlled.

[Remaining difference correction execution determination processing]
FIG. 4A is a diagram illustrating an operation flow of the remaining amount difference correction execution determination process of the power management apparatus 1. This process is generally a process for determining whether to perform the remaining amount difference correction process based on the storage control type and the change in the state of the storage battery indicated by the cumulative number of cycles and the storage battery SOC state. Furthermore, in this determination process, if “the supply-demand adjustment cannot be made in time by executing the remaining amount difference correction process from the current time to the demand time limit”, the remaining amount difference correction is not performed and the process ends. In the present embodiment, the case of two storage batteries will be described, but three or more storage batteries may be used.

  The control type determination unit 15 determines what the power storage control type is determined in step S2 from the current time to the demand time limit (step S11). The control type determination unit 15 performs condition determination based on the following predetermined condition according to the determined power storage control type.

When the power storage control type is charging, the remaining amount difference correction execution determination unit 16 determines whether any of the following conditions (i) or (ii) is satisfied (step S12). This condition corresponds to the “first condition” of the present invention.
(I) [SOC state: storage battery 1 <storage battery 2] and [total number of cycles: storage battery 1 <storage battery 2]
(Ii) [SOC state: storage battery 1> storage battery 2] and [total number of cycles: storage battery 1> storage battery 2]
When either (i) or (ii) is established (Yes in step S12), the remaining amount difference correction execution determination unit 16 stores the storage battery (storage battery 1 or storage battery 2) with a low SOC (remaining amount). The control content is provisionally determined to be charged (step S13). On the other hand, if neither (i) nor (ii) is established (No in step S12), the remaining amount difference correction execution determination process ends. The cumulative number of cycles is an example of “degradation information” in the present invention, and in addition to the cumulative number of cycles, a storage battery degradation level, a use temperature, and the like may be used.

When the power storage control type is discharge, the remaining amount difference correction execution determination unit 16 determines whether any of the following conditions (i) or (ii) is satisfied (step S14). This condition corresponds to the “second condition” of the present invention.
(I) [SOC state: storage battery 1 <storage battery 2] and [total number of cycles: storage battery 1> storage battery 2]
(Ii) [SOC state: storage battery 1> storage battery 2] and [total number of cycles: storage battery 1 <storage battery 2]
When either (i) or (ii) is established (Yes in step S14), the remaining amount difference correction execution determination unit 16 stores the storage battery (storage battery 1 or storage battery 2) with a large SOC (remaining amount). The control content is provisionally determined to be discharge (step S15). By such a determination method, it is possible to prevent consumption of an extra cycle number and prevent a difference in the cumulative cycle number. On the other hand, if neither (i) nor (ii) is established (No in step S14), the remaining amount difference correction execution determination process is terminated.

  After step S13 and step S15, the remaining amount difference correction execution determination unit 16 sets “Psd: required supply-demand adjustment power amount from the current time to the demand time limit” and “(Pout / 60) (td−tn−tm)”. A comparison is made to determine whether or not a remaining amount difference correction process is to be performed (step S16).

  The remaining amount difference correction execution determination unit 16 determines to perform the remaining amount difference correction process only when the former is smaller (Yes in step S16). On the other hand, when the former is greater than or equal to the latter, the remaining amount difference correction execution determination unit 16 determines not to perform the remaining amount difference correction process, and ends the remaining amount difference correction execution determination process (No in step S16).

  When the power storage control type is in the standby state, the remaining amount difference correction execution determination unit 16 ends the remaining amount difference correction execution determination process (step S17).

  FIG. 4B is a diagram illustrating an SOC (remaining amount) situation. FIG. 4B shows a case where the SOC of the storage battery 1 is larger than the SOC of the storage battery 2 as an example, and the difference is represented by ΔP. ΔP is used in the remaining amount difference correction execution process described later.

[Remaining difference correction execution processing]
FIG. 5A is a diagram illustrating an operation flow of remaining amount difference correction execution processing. This process generally determines whether to start charging / discharging individual storage batteries at the current time, and determines each power storage control content according to the determination result so that the required supply-demand adjustment power can be satisfied. This is a process for performing power control. This processing can also be referred to as processing for performing different control according to the elapsed time within the demand time period.

  When it is determined that the remaining amount difference correction execution determination unit 16 performs the remaining amount difference correction process, the calculation unit 17 calculates the charge / discharge time t1 [min] by one storage battery (step S21). Here, under the conditions of (Pout_use / 60) t1 + (Pout / 60) t2 = Psd, t1 + t2 = td-tn-tm, t1 = (td-tn-tm) / {1- (Pout_use / Pout)} -Psd / {(Pout-Pout_use) / 60} to obtain t1.

  Pout_use is the rated output of the storage battery temporarily determined in step S13 or step S15, and is equal to Pout_1 or Pout_2. t1 is the charge / discharge time by one storage battery, and t2 is the charge / discharge time by two storage batteries. Note that t1 = td−tn−tm is set when the discharge is performed and the measurement data (load) for one minute is less than 5 kW. Note that t2 can be calculated from t2 = td−tn−tm−t1, but since t2 is not used in the present embodiment, the calculation is not necessarily performed.

  The remaining amount difference correction execution processing unit 18 used one storage battery between “ΔP: chargeable / dischargeable electric energy necessary to fill the remaining amount difference” and “(Pout_use / 60) t1: t1 [min]”. The chargeable / dischargeable electric energy ”is compared, and it is determined whether charging / discharging is started for each storage battery at the current time (step S22). When the former is smaller than the latter (No in Step S22), the remaining amount difference correction execution processing unit 18 changes the storage control content of the storage battery 1 and the storage battery 2 to the standby state (Wait) (Step S23).

  In this embodiment, when there is a time allowance with respect to the supply and demand adjustment amount, the power storage control content is set to the standby state. This is because a method of using past performance values is often used in the calculation process of the supply and demand adjustment amount. Since the accuracy of the supply and demand adjustment amount increases as the actual value increases, the power storage control when there is a time allowance with respect to the demand time limit is not performed immediately but is performed later.

  On the other hand, if the former is greater than or equal to the latter (Yes in step S22), the remaining amount difference correction execution processing unit 18 makes the power storage control content provisionally determined in step S13 and step S15 as the final determination (step S24) and does not use it further. The control content of the storage battery is changed to a standby state (Wait) (step S25). Note that the state in step S24 is a state in which the supply and demand adjustment amount cannot be satisfied unless the power storage control is performed from t1 + t2 from the current time. The figure which shows the relationship between time and charging / discharging electric energy at the time of actually performing charging / discharging control is shown to FIG. 5B.

  As in the present embodiment, the remaining battery level difference correction execution determination is performed according to the SOC (remaining capacity) status of the storage battery, the cumulative number of cycles of the storage battery, and the power storage control type from the current time to the next demand time limit start time. Thus, it is possible to suppress the deterioration of the storage battery that occurs due to the remaining amount difference correction process.

  In addition, by comparing the "chargeable / dischargeable power amount by the remaining amount difference correction process" and the "required supply and demand adjustment power amount from the current time to the next demand time limit start time", the execution determination of the remaining amount difference correction process is performed. It is possible to suppress occurrence of a difference in remaining amount between storage batteries and to suppress “insufficiency in supply / demand adjustment amount within a demand time period caused by remaining amount difference correction processing”.

  In this embodiment, although the case where there were two storage batteries was demonstrated, this method is applicable as a processing method which considered both supply-and-demand adjustment and the number of cycles similarly also in the case of three or more. Even in the case of three or more units, priority is given to supply and demand adjustment, the battery with the smallest remaining amount is preferentially charged during charging, and the battery with the largest remaining amount is preferentially discharged during discharging.

  When the power management apparatus 1 according to the present invention is configured by a computer, a program describing processing contents for realizing each function is stored in an internal or external storage unit of the computer, and the central processing of the computer is performed. This can be realized by reading and executing this program by a processing device (CPU). In addition, such a program can be distributed by selling, transferring, or lending a portable recording medium such as a DVD or a CD-ROM, and such a program is stored in a storage unit of a server on a network, for example. And the program can be distributed by transferring the program from the server to another computer via the network. In addition, a computer that executes such a program can temporarily store, for example, a program recorded on a portable recording medium or a program transferred from a server in its own storage unit. As another embodiment of the program, the computer may directly read the program from a portable recording medium and execute processing according to the program, and each time the program is transferred from the server to the computer. In addition, the processing according to the received program may be executed sequentially. Therefore, the present invention is not limited to the above-described embodiments, and various modifications can be made by combining or partially deleting the same without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Power management apparatus 2 Storage battery system 3 Power generation equipment control system 4 Power generation equipment 5 Network
6 Power System 11 Control Unit 12 Communication Unit 13 Control Type Determination Unit 14 Control Content Setting Unit 15 Control Type Determination Unit 16 Remaining Difference Correction Execution Determining Unit 17 Calculation Unit 18 Residual Difference Correction Execution Processing Unit 19 Storage Unit 21 PCS
22 Storage battery

Claims (7)

A power management device capable of controlling a plurality of storage batteries,
When the demand for power supply / demand adjustment is received and the supply / demand adjustment power amount in the demand time period is smaller than the amount of power that can be charged / discharged in the plurality of storage batteries in the demand time period, the plurality of storage battery A power management apparatus that controls charging / discharging of the plurality of storage batteries so as to suppress a difference in remaining amount between the plurality of storage batteries using the remaining amount and deterioration information . The power management device according to claim 1 ,
The power management apparatus which determines the control method of charging / discharging of said some storage battery based on measurement data and a prior plan value. The power management device according to claim 1 or 2 ,
When charging the plurality of storage batteries, among the plurality of storage batteries, the storage battery with a small remaining amount is preferentially charged,
When discharging the plurality of storage batteries, a power management apparatus that preferentially discharges a storage battery having a large remaining amount among the plurality of storage batteries. A power management system including a plurality of storage batteries and a power management device capable of controlling the plurality of storage batteries,
When the power supply / demand adjustment request is received and the supply / demand adjustment power amount in the demand time period is smaller than the power amount that can be charged / discharged of the plurality of storage batteries in the demand time period, the power management device A power management system that controls charging / discharging of the plurality of storage batteries so as to suppress a difference in remaining amount between the plurality of storage batteries using the remaining amount and deterioration information of the plurality of storage batteries. The power management system according to claim 4 ,
When charging the plurality of storage batteries, the power management device preferentially charges a storage battery with a small remaining amount among the plurality of storage batteries,
When discharging the plurality of storage batteries, a power management system that preferentially discharges a storage battery having a large remaining amount among the plurality of storage batteries. A power management method in a power management apparatus capable of controlling a plurality of storage batteries,
When receiving a request for power supply and demand adjustment, a determination step of determining whether or not the supply and demand adjustment power amount in the demand time period is smaller than the amount of power capable of charging and discharging the plurality of storage batteries in the demand time period; and
When it is determined that the supply / demand adjustment power amount is smaller than the chargeable / dischargeable power amount, the remaining amount difference between the plurality of storage batteries is calculated using the remaining amount and deterioration information of the plurality of storage batteries. A control step of controlling charging and discharging of the plurality of storage batteries to suppress,
Power management method including. The power management method according to claim 6 ,
In the control step, when charging the plurality of storage batteries, among the plurality of storage batteries, the storage battery with a small remaining amount is preferentially charged, and when discharging the plurality of storage batteries, the remaining storage battery among the plurality of storage batteries. A power management method that preferentially discharges a large amount of storage battery.

Images