JP2011200084A - Secondary battery control apparatus, secondary battery control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control appropriately the amount of stored power of a secondary battery device used for demand and supply control in a power system.SOLUTION: An SOC (storage amount of charge) understanding unit 61 captures an SOC value output from the secondary battery device 5 to understand a present SOC value. A control mode determination unit 62 determines whether the secondary battery device 5 should be operated in an SOC maintaining mode for maintaining the SOC to a suitable value, or the secondary battery device 5 should be operated in a general normal mode, on the basis of the present SOC value understood by the SOC understanding unit 61. A charging and discharging efficiency values setting unit 63 sets up a charge efficiency value and a discharge efficiency value of the secondary battery device 5. An output command value generating unit 64 for the SOC maintaining mode generates a value obtained by correcting an output command value generated by a demand and supply control apparatus 7 by using the charge efficiency value or the discharge efficiency value set up by the charging and discharging efficiency values setting unit 63, as an output command value for the SOC maintaining mode. An output switching unit 65 switches the output command value, so that the output command value generated by the output command value generating unit 64 for the SOC mode is transmitted to the secondary battery device 5.

Description

  The present invention relates to a secondary battery control device, a secondary battery control method, and a program for controlling a secondary battery device used for power supply and demand control.

  Using multiple types of distributed power sources such as engine generators, turbine generators, power storage devices, fuel cells, solar power generators and wind power generators installed in specific regions, There is a small-scale power system called a microgrid that supplies power to consumers.

  When connecting a small-scale power system to a commercial power system of an electric power company, there are a case where a forward power flow is received from the commercial power system and a case where a reverse power flow is supplied to the commercial power system. In any case, the power flow (amount of power) at any point on the power system, or the power of the distributed power source in the small system that keeps the deviation between the load power and the power generation output in the small power system constant. Supply and demand control is necessary.

  In power supply and demand control in a small-scale power system, in order to absorb power fluctuations generated in the small-scale power system, a secondary battery device (hereinafter referred to as “2”) for storing power together with an engine generator, a turbine generator, and a fuel cell. The secondary battery absorbs relatively fast output fluctuations generated by a natural energy generator in a small-scale power system and steep load fluctuations generated in a small-scale power system. Is.

  As a technique for applying the secondary battery to the power system, for example, Patent Document 1 can be cited.

JP 2006-094649 A

  When performing supply and demand control using a secondary battery, if the secondary battery is used without knowing the amount of power stored in the secondary battery (hereinafter referred to as SOC), the SOC is close to 100% or the SOC is close to 0%. There is a possibility of entering a state. If the SOC is close to 100%, it cannot be charged when it is desired to be charged. If the SOC is close to 0%, it cannot be discharged when it is desired to be discharged. It becomes impossible to compensate, and it becomes impossible to maintain a balance between supply and demand.

  In particular, fast fluctuation components of the output power of the natural energy power generator and the power consumption of the load are generated probabilistically. For example, the SOC is almost balanced, but actually there is a charge / discharge loss, so the SOC continues to decrease over time, and the SOC may become 0%.

  The present invention has been made in view of the above circumstances, and provides a secondary battery control device, a secondary battery control method, and a program that appropriately control the amount of electricity stored in a secondary battery device used for supply and demand control of an electric power system. The purpose is to do.

  A secondary battery control device according to an aspect of the present invention is a secondary battery control device that controls the secondary battery device using an output command value generated for the secondary battery device from a power supply and demand control device. The storage amount grasping means for grasping the current storage amount of the secondary battery device, and the storage amount approaches the end of charge or approaches the end of discharge according to the current storage amount grasped by the storage amount grasping means Control mode determining means for determining whether or not the secondary battery device should be operated in a storage amount maintaining mode for suppressing the charge, and charging and discharging efficiency for setting a charging efficiency value and a discharging efficiency value of the secondary battery device A value setting unit and a value obtained by correcting the output command value generated by the supply and demand control device using the charge efficiency value or the discharge efficiency value set by the charge / discharge efficiency setting unit; Output command value generation means for a storage amount maintenance mode generated as an output command value for generating, and when the control mode determined by the control mode determination means is the storage amount maintenance mode, the output instruction value for the storage amount maintenance mode is generated The output command value generated by the means is transmitted to the secondary battery device, and when not in the power storage amount maintenance mode, the output command value generated by the supply and demand control device is sent to the secondary battery device. It is characterized by comprising output switching means for switching the output command value so as to be transmitted.

  A secondary battery control method according to another aspect of the present invention is a secondary battery control method for controlling a secondary battery device based on an output command value generated from a power supply / demand control device to the secondary battery device. In this case, the storage amount grasping means grasps the current storage amount of the secondary battery device, and the control mode determination means determines whether the storage amount is charged according to the current storage amount grasped by the storage amount grasping means. Determining whether or not the secondary battery device should be operated in a storage amount maintaining mode for suppressing approaching to the end of discharge or approaching the end of discharge, and the charge / discharge efficiency value setting means determines the charging efficiency of the secondary battery device A charge efficiency value or a discharge efficiency value set by the charge / discharge efficiency setting means. For A value obtained by correcting the power storage amount is generated as an output command value for the power storage amount maintenance mode, and the output switching means is configured to store the power storage when the control mode determined by the control mode determination means is the power storage amount maintenance mode. The output command value generated by the amount maintenance mode output command value generation means is transmitted to the secondary battery device, and when not in the power storage amount maintenance mode, the output command value generated by the supply and demand control device The output command value is switched so that the value is transmitted to the secondary battery device.

  According to another aspect of the present invention, there is provided a program for controlling a secondary battery device based on an output command value generated for a secondary battery device from a power supply and demand control device. In order to suppress the storage amount approaching the end of charge or approaching the end of discharge according to the storage amount grasping function for grasping the current storage amount of the device and the current storage amount grasped by the storage amount grasping function A control mode determination function for determining whether or not to operate the secondary battery device in the storage amount maintenance mode, and a charge / discharge efficiency value setting function for setting a charge efficiency value and a discharge efficiency value of the secondary battery device, A value obtained by correcting the output command value generated by the supply and demand control device using the charge efficiency value or the discharge efficiency value set by the charge / discharge efficiency setting function is set in the storage amount maintenance mode. Output command value generation function for storage amount maintenance mode generated as an output command value for generation, and output command value generation for storage amount maintenance mode when the control mode determined by the control mode determination function is the storage amount maintenance mode The output command value generated by the function is transmitted to the secondary battery device, and when not in the power storage amount maintenance mode, the output command value generated by the supply and demand control device is sent to the secondary battery device. An output switching function for switching the output command value is realized by the computer so as to be transmitted.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage amount of the secondary battery apparatus used for the supply-and-demand control of an electric power grid | system can be controlled appropriately.

The block diagram which shows schematic structure of the electric power grid | system system with which the secondary battery control apparatus which concerns on the 1st Embodiment of this invention is applied. The block diagram which shows the function structure of the secondary battery control apparatus which concerns on the same embodiment. The figure for demonstrating the upper limit A and the lower limit B of SOC. The figure which shows the specific example of a process of the output command value production | generation part for SOC maintenance modes. The figure for demonstrating correction | amendment of the output command value transmitted from a supply-and-demand control apparatus. The figure which shows the specific example of an output switching part. The flowchart which shows operation | movement of the secondary battery control apparatus which concerns on the same embodiment. The block diagram which shows the function structure of the secondary battery control apparatus which concerns on the 2nd Embodiment of this invention. The block diagram which shows the function structure of the charging / discharging efficiency setting part with which the secondary battery control apparatus which concerns on the 3rd Embodiment of this invention is equipped. The figure which shows an example of the characteristic data used for preparation of the information memorize | stored in charging / discharging efficiency value DB part.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
First, a first embodiment of the present invention will be described.

  FIG. 1 is a block diagram showing a schematic configuration of an electric power system to which the secondary battery control device according to the first embodiment of the present invention is applied.

This system has an external system 1 and a small-scale power system 2. An external system 1 is connected to the small-scale power system 2, and n distributed power sources 31 to 3n, m load facilities 41 to 4m, and a secondary battery device 5 are connected. The secondary battery device 5 includes an AC / DC converter (AC / DC) 5a and a storage battery 5b. The secondary battery control device 6 is connected to the secondary battery device 5 so that the secondary battery device 5 can be controlled. The supply and demand control device 7 is connected to the secondary battery device 5 and the like via the secondary battery control device 6 so that the supply and demand control of the power system can be performed.

  The external system 1 is a commercial power system, for example, and is a power system located outside the small-scale power system 2.

  The small-scale power system 2 corresponds to, for example, a microgrid (or smart grid), and supplies power to consumers in a specific area using various distributed power sources. The small-scale power system 2 is connected to the external system 1 and receives power from the external system 1 or supplies power to the external system 1.

  The distributed power sources 31 to 3n correspond to, for example, an engine generator, a turbine generator, a power storage device, a fuel cell, a natural energy power generation device, and the like.

  The load facilities 41 to 4 m correspond to facilities of consumers who consume electric power.

  The secondary battery device 5 absorbs relatively fast output fluctuations generated by a natural energy power generation device or the like in the small-scale power system 2 or steep load fluctuations generated in the small-scale power system 2. The secondary battery control device 6 charges and discharges the storage battery 5b through the AC / DC converter 5a according to the output command value transmitted from the secondary battery control device 6. Hereinafter, the SOC of the storage battery 5b is referred to as “SOC”.

The secondary battery unit 5, the output P _C of the DC side of the AC-DC converter _5a, is operated as P _D is the output command value transmitted from the secondary battery control device 6. Here, P _C, the effective power, P _D of the DC circuit side of the AC-DC converter 5a during charging operation is active power of a DC circuit side of the AC-DC converter 5a during discharging operation. Further, _PIN is effective power stored in the storage battery 5b during the charging operation, and P _OUT is effective power discharged from the storage battery 5b during the discharging operation. P _IN and P _OUT are expressed by the following equations (1) and (2) from the charging efficiency and discharging efficiency of the storage battery 5b.

_{P IN} = P _C × charging efficiency ... (1)
P _OUT = P _D / Discharge efficiency (2)
The supply and demand control device 7 performs power supply and demand control for maintaining a constant deviation between the power flow (power amount) at a certain point on the power system or the load power in the small-scale power system 2 and the power generation output. is there. This supply and demand control device 7 generates an output command value for the distributed power sources 31 to 3n and an output command value for the secondary battery device 5 and transmits them to the corresponding locations in the small-scale power system 2. However, the output command value for the secondary battery device 5 is transmitted via the secondary battery control device 6.

  FIG. 1 illustrates the case where the secondary battery control device 6 is provided outside the small-scale power system 2, but the secondary battery control device 6 may be provided inside the small-scale power system 2. Good. In such a case, the secondary battery control device 6 may be provided inside the secondary battery device 5 or may be provided outside the secondary battery device 5.

  FIG. 2 is a block diagram showing a functional configuration of the secondary battery control device according to the embodiment.

  The secondary battery control device 6 includes an SOC grasping unit 61, a control mode determining unit 62, a charge / discharge efficiency value setting unit 63, an SOC maintenance mode output command value generating unit 64, and an output switching unit 65.

  The SOC grasping unit 61 captures the SOC value output from the secondary battery device 5, grasps the current SOC value, and transmits it to the control mode determining unit 62.

  The control mode determination unit 62 should operate the secondary battery device 5 in the SOC maintenance mode for maintaining the SOC at an appropriate value according to the current SOC value transmitted from the SOC grasping unit 61, or in general It is determined whether the secondary battery device 5 should be operated in the normal mode, and a signal for identifying the determined control mode is transmitted to the output switching unit 65.

  Here, the SOC maintenance mode is for suppressing that the SOC approaches the end of charging (100% of the capacity) or the SOC approaches the end of discharge (0% of the capacity) in charging / discharging in the secondary battery device 5. The normal mode is a mode in which charging / discharging in the secondary battery device 5 is performed according to the output command value from the supply and demand control device 7. When the SOC approaches the end of discharging or charging, the SOC maintenance mode is selected. When the SOC has a margin with respect to the end of discharging or charging, the normal mode is selected. For example, as shown in FIG. 3, the upper limit value A and the lower limit value B of the SOC are preset in the control mode determination unit 62, and the current SOC, the upper limit value A and the lower limit transmitted from the SOC grasping unit 61 are set. When the relationship of current SOC> A or current SOC <B is established as compared with the value B, the control mode determination unit 62 selects the SOC maintenance mode and outputs 1 as the control mode identification signal. If the relationship A> current SOC> B is established, the control mode determination unit 62 selects “normal mode” and outputs 0 as the control mode identification signal. To 65.

  The charge / discharge efficiency value setting unit 63 sets the charge efficiency value and the discharge efficiency value of the secondary battery device 5.

  The SOC maintenance mode output command value generation unit 64 corrects the output command value generated by the supply and demand control device 7 using the charge efficiency value or discharge efficiency value set by the charge / discharge efficiency setting unit 63. Is generated as an output command value for the SOC maintenance mode. For example, the SOC maintenance mode output command value generating unit 64 can output the output command value transmitted from the supply and demand control device 7 so that the SOC can be maintained at an appropriate value by processing as shown in FIG. To the output switching unit 65.

  In the process of FIG. 4, the output command value transmitted from the supply and demand control device 7 as shown in FIG. 5A is separated according to the directionality on the discharge side and the charge side. The output command value (positive value) in the discharge direction is multiplied by “discharge efficiency”, and the output command value corrected for the output command value is output to the secondary battery device 5 as shown in FIG. Output as a value. On the other hand, the output command value (negative value) in the charging direction is multiplied by “1 / charging efficiency”, and the output command value corrected as shown in FIG. 5 is output as an output command value. FIG. 5D shows a combination of the discharge-side output command value and the charge-side output command value. Here, the charging efficiency value and the discharging efficiency value are transmitted from the charging / discharging efficiency value setting unit 63.

  In response to the control mode identification signal transmitted from the control mode determining unit 62, the output switching unit 65 is transmitted from the output command value transmitted from the SOC maintenance mode output command value generating unit 64 and from the demand / supply control device 7. The output command value is switched with the output command value to be transmitted to the secondary battery device 5. That is, the output switching unit 65 transmits the output command value generated by the SOC mode output command value generating unit 64 to the secondary battery device when the control mode determined by the control mode determining unit 62 is the SOC maintenance mode. In addition, when not in the SOC maintenance mode, the output command value is switched so that the output command value generated by the supply and demand control device 7 is transmitted to the secondary battery device 5. For example, by adopting a circuit combining a multiplier, an adder, and a NOR calculator as shown in FIG. 6, an output command value from the supply and demand control device 7 and an SOC according to the control mode identification signal A mechanism for switching between the SOC mode output command value from the mode output command value generation unit 64 can be realized.

  Next, with reference to FIG. 7, the operation of the secondary battery control device according to the embodiment will be described.

  First, the SOC grasping unit 61 takes in the SOC value output from the secondary battery device 5 and grasps the current SOC value (step S11).

  Next, the control mode determination unit 62 determines whether or not the current SOC value is within a range between the upper limit value A and the lower limit value B (step S12).

  When the current SOC value is higher than the upper limit value A or lower than the lower limit value B (NO in step S12), the following steps S13 to S15 are performed.

  First, the control mode determination unit 62 determines to set the control mode to the SOC maintenance mode (step S13). The SOC maintenance mode output command value generation unit 64 corrects the output command value generated by the supply and demand control device 7 using the charge efficiency value or discharge efficiency value set by the charge / discharge efficiency setting unit 63. Is generated as an output command value for the SOC maintaining mode (step S14). Then, the output switching unit 65 switches the output command value so that the output command value generated by the SOC mode output command value generating unit 64 is transmitted to the secondary battery device 5 (step S15).

  On the other hand, when the current SOC value is between the upper limit value A and the lower limit value B (YES in step S12), the following steps S16 to S17 are performed.

  First, the control mode determination unit 62 determines to set the control mode to the normal mode (step S16). And the output switch part 65 switches an output command value so that the output command value produced | generated by the supply-and-demand control apparatus 7 may be transmitted to the secondary battery apparatus 5 (step S17).

  Thereafter, the processing from step S11 is repeated.

  According to the first embodiment, when there is a margin in the SOC, the secondary battery device 5 is charged / discharged according to the output command value from the demand / supply control device 7, and the SOC approaches the end of charge or the end of discharge. In such a case, the secondary battery device 5 can be controlled so that the SOC does not reach the end of charging or discharging.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.

  In the second embodiment, the same reference numerals are given to the portions common to the configuration of the first embodiment described above, and a duplicate description is omitted. Below, it demonstrates centering on a different part from 1st Embodiment.

  The schematic configuration of the power system to which the secondary battery control device according to the second embodiment of the present invention is applied is the same as that of FIG. 1 described in the first embodiment.

  FIG. 8 is a block diagram showing a functional configuration of the secondary battery control device according to the second embodiment of the present invention. Here, the description will focus on the parts different from FIG.

  The secondary battery control device 6 according to the second embodiment includes an SOC calculation unit 66 instead of the SOC determination unit 61 described above or in addition to the SOC determination unit 61 described above. The SOC calculation unit 66 calculates the current SOC of the secondary battery device 5 using the charge efficiency value or discharge efficiency value set by the charge / discharge efficiency setting unit 63 and the output value of the secondary battery device 5. is there.

For example, the SOC calculation unit 66 takes in the current actual output values (P _C (t), P _D (t)) from the secondary battery device 5, and the charge efficiency value set by the charge / discharge efficiency setting unit 63 From the discharge efficiency value, the current SOC that changes over time is calculated by the following equation (3).

Here, P ₀ in the equation (3) is a value indicating the initial SOC.

  The current SOC value calculated by the equation (3) is transmitted to the control mode determination unit 62.

  According to the second embodiment, the same effect as that of the first embodiment described above can be obtained, and the SOC can be calculated even if the SOC information is not obtained from the secondary battery device. can get.

(Third embodiment)
Next, a third embodiment of the present invention will be described.

  In the third embodiment, parts that are the same as those in the first and second embodiments described above are given the same reference numerals, and redundant descriptions are omitted. Below, it demonstrates focusing on a different part from 1st and 2nd embodiment.

  The schematic configuration of the power system to which the secondary battery control device according to the third embodiment of the present invention is applied is the same as that of FIG. 1 described in the first embodiment.

  The third embodiment shows a specific configuration example of the charge / discharge efficiency setting unit 63 (see FIGS. 2 and 8) shown in the first and second embodiments described above.

  FIG. 9 is a block diagram showing a functional configuration of a charge / discharge efficiency setting unit provided in the secondary battery control device according to the third embodiment of the present invention.

  As shown in FIG. 9, the charge / discharge efficiency setting unit 63 includes a charge / discharge efficiency value DB unit 63a and a charge / discharge efficiency value extraction unit 63b.

  The charge / discharge efficiency value DB unit 63a stores information indicating the relationship between the SOC of the secondary battery device 5, the charge efficiency value, and the discharge efficiency value.

  The charge / discharge efficiency value extraction unit 63b uses the information stored in the charge / discharge efficiency value DB unit 63a to extract a charge efficiency value and a discharge efficiency value corresponding to the current SOC.

  Thus, in the configuration, the current SOC value transmitted from the SOC grasping unit 61 to the charge / discharge efficiency value setting unit 63 is transmitted to the charge / discharge efficiency value extracting unit 63b. The charge / discharge efficiency value extraction unit 63b extracts a charge efficiency value and a discharge efficiency value corresponding to the transmitted current SOC value from information stored in the charge / discharge efficiency value DB unit 63a. For example, the charge / discharge efficiency value DB unit 63a prepares a table based on storage battery characteristic data as the information. An example of the table is shown below.

  For example, assuming that the current SOC is 50%, charging efficiency = 0.70 and discharging efficiency = 0.95 are extracted from the table of the charging / discharging efficiency value DB unit 63a, and the secondary battery control device 6 uses these charging efficiency values. The process is performed using the discharge efficiency value.

  In the above description, a method for preparing a table in the charge / discharge efficiency value DB unit 63a and extracting the charge / discharge efficiency value from the table has been described. However, instead of using a table, a form using an arithmetic expression instead may be adopted. Good. For example, based on characteristic data (discharge efficiency curve, charge efficiency curve) representing the relationship between SOC and charge / discharge efficiency as shown in FIG. 10, the charge efficiency and discharge efficiency are approximated by a function of SOC. A certain formula (4) and formula (5) may be prepared and prepared, and the charging efficiency value and the discharging efficiency value may be obtained using them.

Charging efficiency = f (SOC) (4)
Discharge efficiency = f (SOC) (5)
According to the third embodiment, the same effects as those of the first and second embodiments described above can be obtained, and the charge / discharge efficiency value can be changed according to the state of the SOC, regardless of the state of the SOC. As compared with the control in which the charge / discharge efficiency value is constant, the effect that the SOC maintenance control with higher accuracy can be realized is obtained.

  The secondary battery control device 6 shown in the first to third embodiments described above further transmits information on the current control state of the secondary battery device 5 to the outside of the secondary battery control device 6. Function (not shown). Information on the current control state includes the current SOC of the secondary battery device 5, the control mode, a signal for recognizing that the end of charge has been reached, a signal for recognizing that the end of discharge has been reached, and the like. Other devices such as the supply and demand control device 7 can grasp the operation state of the secondary battery device 5 by taking in the information.

  The various functions of the secondary battery control device 6 shown in the first to third embodiments described above may be realized by hardware or software (computer program). When realized by a computer program, a storage medium that stores the program and a processor that executes the program may be mounted on, for example, the secondary battery device 5. In that case, since the secondary battery device can operate autonomously so as not to end discharge or charge, it is possible to reduce power storage amount management work by an operator of a small-scale power system. Alternatively, the duty of the power storage amount management function on the supply and demand control device side can be reduced.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 1 ... External system, 2 ... Small power system, 31-3n ... Distributed power supply, 41-4m ... Load equipment, 5 ... Secondary battery apparatus, 5a ... AC-DC converter, 5b ... Storage battery, 6 ... Secondary battery Control device, 7 ... Supply and demand control device, 61 ... SOC grasping unit, 62 ... Control mode determining unit, 63 ... Charge / discharge efficiency value setting unit, 64 ... Output command value generating unit for SOC maintenance mode, 65 ... Output switching unit, 63a ... charging / discharging efficiency value DB part, 63b ... charging / discharging efficiency value extraction part.

Claims (6)

In the secondary battery control device that controls the secondary battery device using the output command value generated for the secondary battery device from the supply and demand control device of the power system,
A storage amount grasping means for grasping a current storage amount of the secondary battery device;
The secondary battery device should be operated in the storage amount maintenance mode for suppressing the storage amount from approaching the end of charging or the end of discharging according to the current storage amount grasped by the storage amount grasping means. Control mode determining means for determining whether or not,
Charge / discharge efficiency value setting means for setting a charge efficiency value and a discharge efficiency value of the secondary battery device;
A value obtained by correcting the output command value generated by the supply and demand control device using the charge efficiency value or the discharge efficiency value set by the charge / discharge efficiency setting means is an output command value for the storage amount maintaining mode. Output command value generation means for the storage amount maintenance mode generated as:
When the control mode determined by the control mode determination unit is the storage amount maintenance mode, the output command value generated by the storage amount maintenance mode output command value generation unit is transmitted to the secondary battery device. And output switching means for switching the output command value so that the output command value generated by the supply and demand control device is transmitted to the secondary battery device when not in the power storage amount maintenance mode. A secondary battery control device. The secondary battery control device according to claim 1,
Using a charge efficiency value or discharge efficiency value set by the charge / discharge efficiency setting means and an output value of the secondary battery device, comprising a storage amount calculation means for calculating a current storage amount of the secondary battery device. A secondary battery control device. The secondary battery control device according to claim 1 or 2,
The charge / discharge efficiency setting means includes:
Charge / discharge efficiency value storage means for storing information indicating the relationship between the storage amount of the secondary battery device and the charge efficiency value and the discharge efficiency value;
Charge / discharge efficiency value extraction means for extracting a charge efficiency value and a discharge efficiency value corresponding to a current charge amount using information stored in the charge / discharge efficiency value storage means; Next battery control method. The secondary battery control device according to any one of claims 1 to 3,
A secondary battery control, comprising: means for outputting information including at least a storage amount of the secondary battery device and a control mode determined by the control mode determination means to the outside of the secondary battery control device. Method. In the secondary battery control method for controlling the secondary battery device based on the output command value generated for the secondary battery device from the power supply and demand control device,
The storage amount grasping means grasps the current storage amount of the secondary battery device,
The control mode determination unit is configured to store the secondary in the storage amount maintenance mode for suppressing the storage amount from approaching the end of charge or approaching the end of discharge according to the current storage amount grasped by the storage amount grasping unit. Decide whether or not to operate the battery device,
The charge / discharge efficiency value setting means sets the charge efficiency value and the discharge efficiency value of the secondary battery device,
A value obtained by correcting the output command value generated by the supply / demand control device using the charge efficiency value or the discharge efficiency value set by the charge / discharge efficiency setting unit, by the output command value generating unit for the storage amount maintaining mode Is generated as an output command value for the power storage amount maintenance mode,
When the control mode determined by the control mode determination unit is the storage amount maintenance mode, the output switching unit outputs the output command value generated by the storage amount maintenance mode output command value generation unit to the secondary battery device. And switching the output command value so that the output command value generated by the supply and demand control device is transmitted to the secondary battery device when not in the power storage amount maintenance mode. A secondary battery control method characterized by the above. In a program for controlling a secondary battery device based on an output command value generated for a secondary battery device from a power supply and demand control device,
A power storage amount grasping function for grasping a current power storage amount of the secondary battery device;
The secondary battery device should be operated in a storage amount maintenance mode for suppressing the storage amount from approaching the end of charge or approaching the end of discharge according to the current storage amount grasped by the storage amount grasping function A control mode determination function for determining whether or not,
A charge / discharge efficiency value setting function for setting a charge efficiency value and a discharge efficiency value of the secondary battery device; and
A value obtained by correcting the output command value generated by the supply and demand control device using the charge efficiency value or the discharge efficiency value set by the charge / discharge efficiency setting function is an output command value for the storage amount maintenance mode. Output command value generation function for storage amount maintenance mode generated as
When the control mode determined by the control mode determination function is the storage amount maintenance mode, the output command value generated by the storage amount maintenance mode output command value generation function is transmitted to the secondary battery device. In addition, when not in the power storage amount maintenance mode, the computer realizes an output switching function for switching the output command value so that the output command value generated by the supply and demand control device is transmitted to the secondary battery device. program.

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