JP6324731B2 - Control device, power generation system including the same, control method, and control program - Google Patents

Description

  The present invention relates to a control device, a power generation system including the control device, a control method, and a control program.

For example, when suppressing the output fluctuation of a wind power generator in a wind farm, it is required to suppress the fluctuation only by using a facility capable of storing energy such as a battery without reducing the output of the wind power generator as much as possible. Has been.
In the following Patent Document 1, it is described that the fluctuation of the active power generated in the AC power system is suppressed by controlling the charging rate of the DC energy storage device when the DC energy storage device is fully charged and at the end of discharge. ing.

JP 2012-1000048 A1

By the way, when output fluctuation suppression control is being performed, a command may be issued by the power system operator to reduce the output of the wind farm below a certain value for system stabilization. In such a case, the output of the wind turbine generator is first reduced, but if the output is suddenly reduced, adverse effects on the power system are predicted. It tries to be close to the value.
At this time, if the battery operation method is incorrect, the maximum charging current is generated, and the battery is fully charged at a stretch.As a result, an unfavorable state in which the charging function of the battery stops or deteriorates is caused, and the power system is stabilized. There was a problem that it could not contribute to the transformation.

  The present invention has been made in view of such circumstances, and is a power storage device control device that can prevent the charging function of the power storage device from being stopped or from progressing deterioration, a power generation system including the control device, and a control method. An object is to provide a control program.

In order to solve the above problems, the present invention employs the following means.
The present invention is a control device that controls charging / discharging of a power storage device that is linked to a power system and connected to a power generation device that generates power by natural energy, and when an output reduction command for the power system is acquired, Determining means for determining whether or not a current value that is a charging rate of the power storage device is greater than a target charging rate of the power storage device, and as a result of the determination, the current value of the power storage device is less than or equal to the target charging rate When it is determined that there is, the power storage device is charged with at least a part of the difference between the output of the power generation device and the target output targeted by the output reduction command, and the charge rate of the power storage device is and control means for charging such that the target charging rate, the control unit may calculate the output of the power generator, the required time it takes to be reduced to the target output by the predetermined output reduction rate , The charging rate of the power storage device over the required time to provide a control device for controlling such that the target charging rate.

According to the present invention, when an output reduction command for the power system is acquired, an output equal to or higher than the target output targeted by the output reduction command is redundant, so the current value that is the current charging rate of the power storage device is the target. When it is determined that the charging rate is equal to or lower than the charging rate, at least a part of the output that is surplus until the power storage device reaches the target charging rate is charged in the power storage device.
As described above, the power storage device is operated in a desirable state by storing a part of the output of the power generation device that has been surplus and discarded in the past and charging control so as to maintain the target charging rate. Thereby, it is possible to prevent the charging of the power storage device from abruptly progressing and reach full charge, and to prevent the charging function from being stopped and the power storage device from deteriorating.

In addition, since charging control is performed so that the charging rate of the power storage device becomes the target charging rate over the time required until the output of the power generating device reaches the target output, the progress of charging of the power storage device becomes slow, and the power generating device When the output is reduced, the deterioration of the power storage device can be prevented.

  It is preferable that the control means of the control device charges the power storage device with a charging current value not more than a predetermined threshold that does not affect the deterioration of the power storage device.

  When the output reduction rate of the power generation device is fast, a large current flows through the power storage device, which may cause deterioration (damage) of the power storage device. Therefore, a threshold value is provided for the charging current. By providing a threshold value for the charging current, priority can be given to reliably preventing damage to the power storage device over reaching the target charging rate of the power storage device.

  The control means of the control device calculates a temporary charging current value based on a difference between the current value and the target charging rate and the required time, and the temporary charging current value is calculated based on the predetermined threshold value. When the charge current value is smaller, the power storage device is charged with the calculated charge current of the temporary charge current value, and when the temporary charge current value is equal to or greater than the threshold value, the power storage device is charged with the threshold charge current. It is good.

  Since a temporary charging current value corresponding to the charging rate of the power storage device is calculated and the temporary charging current value is within a range that does not exceed the threshold value, the power storage device is charged with the charging current of the calculated temporary charging current value. Control according to the charging status of the apparatus can be performed, and the target charging rate can be accurately maintained.

  In the above control device, the power storage device includes a first power storage device excellent in suppressing short-cycle output fluctuations and a second power storage device excellent in suppressing long-cycle output fluctuations, and an output reduction command for the power system The control means may charge the second power storage device until the charging rate of the second power storage device reaches a predetermined full charge state.

  Even if the output reduction control of the power generation device is not performed, the synthesis obtained by the output of the power generation device and the charge amount of the second power storage device by charging with the second power storage device excellent in suppressing long-period output fluctuations Output can be reduced. According to the present invention, since the control for reducing the output of the power generation device can be delayed, a part of the output of the power generation device that has been conventionally discarded can be stored more, and the amount of power sold increases.

  The control means of the control device is configured to reduce the output of the power generation device when detecting that the charging rate of the second power storage device has become a charging rate that is lower by a predetermined amount than the predetermined full charge state. May be output.

  Thereby, the surplus of the output by the power generator after the second power storage device reaches a predetermined full charge state can be suppressed.

  The present invention provides a power generation system including any of the control devices described above and a power storage device.

The present invention is a control method for controlling charging / discharging of a power storage device that is linked to a power system and is connected to a power generation device that generates power by natural energy, and when an output reduction command for the power system is acquired, A first step of determining whether or not a current value that is a charging rate of the power storage device is greater than a target charging rate of the power storage device, and as a result of the determination, the current value of the power storage device is less than or equal to the target charging rate The power storage device is charged with at least a part of the output of the difference between the output of the power generation device and the target output targeted by the output reduction command, and the charge rate of the power storage device is It has a second process of charging the power storage device such that the target charging rate, and in the second step, until the output of the power generator, is reduced to the target output by the predetermined output reduction rate Take Calculating the principal time, the charging rate of the power storage device over the required time to provide a control method for controlling such that the target charging rate.

The present invention is a control program for controlling charging / discharging of a power storage device that is linked to a power system and connected to a power generation device that generates power by natural energy, and when an output reduction command for the power system is acquired, First processing for determining whether or not a current value that is a charging rate of the power storage device is greater than a target charging rate of the power storage device, and as a result of the determination, the current value of the power storage device is equal to or less than the target charging rate The power storage device is charged with at least a part of the output of the difference between the output of the power generation device and the target output targeted by the output reduction command, and the charge rate of the power storage device is wherein said power storage device is charged so that the target charging rate, the output of the power generator, calculates the required time it takes to be reduced to the target output by the predetermined output reduction rate, the required time Only charging rate of the power storage device to provide a control program for executing a second processing that controls so that the target charging rate to the computer.

  The present invention has an effect that the charging function of the power storage device can be stopped and the progress of deterioration can be prevented.

1 is a schematic configuration diagram of a power generation system according to a first embodiment of the present invention. (A) The figure which showed the time tendency of the output of the wind power generator concerning the 1st Embodiment of this invention, (b) The time tendency of the charging current in the case of charging / discharging control by the master controller which concerns on 1st Embodiment. FIG. 4C is a diagram showing a time trend of the charging rate of the secondary battery according to the first embodiment. It is an operation | movement flow of the master controller which concerns on the 1st Embodiment of this invention. It is a continuation of the operation | movement flow of the master controller which concerns on the 1st Embodiment of this invention. It is a schematic block diagram of the electric power generation system which concerns on the 2nd Embodiment of this invention. It is a functional block diagram of the control apparatus which concerns on the 2nd Embodiment of this invention. (A) The figure which showed the time tendency of the output of the wind power generator which concerns on the 2nd Embodiment of this invention, (b) The figure which showed the time tendency of the charging rate of the 2nd electrical storage apparatus which concerns on 2nd Embodiment. It is.

  Hereinafter, embodiments of a control device, a power generation system including the control device, a control method, and a control program according to the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 shows a schematic configuration of a power generation system 1 including a master controller (control device) 10 according to the present embodiment. In the present embodiment, the case where the power generation device that generates power using natural energy is a wind power generation device (hereinafter also referred to as “windmill”) will be described as an example. A combination with a power storage device capable of leveling the amount of power generation such as a device or a wave power generation device is a preferable power generation device, and is not limited to a wind power generation device.

As shown in FIG. 1, a power generation system 1 according to this embodiment includes a wind power generation device (power generation device) 2, a power storage device 3, and a master controller 10, and is connected to a power system 6. Yes. The master controller 10 outputs a charge / discharge command value determined based on the output of the wind turbine generator acquired from the connection point to the power storage device 3.
Further, the wind power generator controller 20 controls the wind power generator 2 based on the command acquired from the wind farm controller 21.

  The wind power generator 2 is an example of a power generator whose output varies depending on the natural environment, and is a power generator that generates power using wind power. For simplification, FIG. 1 will be described by taking as an example a case where there is one wind power generator 2, but the number of wind power generators 2 managed by the master controller 10 is not particularly limited. In the present embodiment, a wind power generator is taken as an example, but a plurality of different types of power generators may be provided.

The power storage device 3 includes a battery controller 30, a secondary battery (power storage device) 31, and a power converter 32.
The secondary battery 31 is not particularly limited, such as a lithium ion secondary battery, a lead storage battery, or a nickel hydride secondary battery, but is preferably a lithium ion secondary battery because it has good charge / discharge followability.
The battery controller 30 controls the power converter 32 based on the charge / discharge command value acquired from the master controller 10, and adjusts the charge rate SOC (State of Charge) of the secondary battery 31.

  The power converter 32 is an AC / DC converter that converts AC and DC. For example, the DC power stored in the secondary battery 31 is set to AC to be a charge / discharge command value determined by the battery controller 30. It is converted into electric power and discharged from the secondary battery 31. In addition, the power converter 32 converts AC power acquired from the wind power generator 2 or the power system 6 into DC power in order to obtain the charge / discharge command value determined by the battery controller 30, and converts the converted power into secondary power. Output to the battery 31 to charge the secondary battery 31.

The master controller 10 includes, for example, a CPU (Central Processing Unit) (not shown), a RAM (Random Access Memory), a computer-readable recording medium, and the like. A series of processing steps for realizing various functions to be described later are recorded in a recording medium or the like in the form of a program, and the CPU reads the program into a RAM or the like to execute information processing / arithmetic processing. Thus, various functions described later are realized.
Specifically, as shown in FIG. 1, the master controller 10 includes a determination unit (determination unit) 11 and a control unit (control unit) 12.

  A command may be issued from the power system 6 to reduce the output of the wind turbine generator 2 to a certain value or less for system stabilization. The determination unit 11 determines whether or not the current value that is the current charging rate of the secondary battery 31 is greater than the target charging rate of the secondary battery 31 when the output reduction command of the power system 6 is acquired, Output the judgment result. In the present embodiment, the target charging rate is described as being set to, for example, SOC 50%, but is not limited thereto, and a predetermined range is provided from the target charging rate, for example, the target charging rate SOC 50%. You may set with +/- 2%. Moreover, the numerical value used here is an example for demonstrating embodiment.

  When it is determined as a result of the determination that the current value of the secondary battery 31 is equal to or less than the target charging rate, the control unit 12 determines the difference between the output of the wind turbine generator 2 and the target output targeted by the output reduction command. At least a part of the output of the secondary battery 31 is charged in the secondary battery 31 so that the charge rate of the secondary battery 31 becomes the target charge rate. In FIG. 2A, time is shown on the horizontal axis, and the output of the wind turbine generator 2 is shown on the vertical axis. As shown in FIG. 2 (a), the control unit 12 outputs a difference until the output of the wind turbine generator 2 reaches the target output, that is, an output greater than the target output during the period from time 0 to time t (shaded part). ) Is charged in the secondary battery 31.

Specifically, the control unit 12 charges the secondary battery 31 so that the charging rate of the secondary battery 31 becomes the target charging rate by controlling the charging current as follows.
The control unit 12 calculates a required time t required for the output of the wind turbine generator 2 to be reduced to the target output at a predetermined output reduction rate, and the charging rate of the secondary battery 31 over the required time t. Is controlled to become the target charging rate. More specifically, when the difference between the output of the wind turbine generator 2 and the target output is set as the wind turbine output ΔP to be reduced and the predetermined wind turbine output reduction rate is expressed as dp / dt, the required time t is (1 ).

  The control unit 12 charges the secondary battery 31 with a charging current value equal to or lower than a predetermined threshold that does not affect the deterioration of the secondary battery 31. Specifically, the control unit 12 calculates a temporary charging current value I_pre based on the difference ΔSOC between the current value and the target charging rate and the required time t, and the temporary charging current value I_pre is smaller than a predetermined threshold value. In such a case, the secondary battery 31 is charged with the calculated temporary charging current value I_pre, and when the temporary charging current value I_pre is equal to or greater than the threshold, the secondary battery 31 is charged with the threshold charging current.

For example, 1 C or less is preferable as the charging current value not more than a predetermined threshold value that does not affect the deterioration of the secondary battery 31. Here, 1C is a current value that flows when a system of 1 [kWh] is charged over 1 hour.
The basis for setting the threshold for the charging current is that when the output reduction rate of the wind power generator 2 is fast, a large current flows through the secondary battery 31 and the secondary battery 31 may deteriorate (damage). This is to prevent deterioration (damage) of the secondary battery 31. By providing a threshold value for the charging current, priority can be given to preventing deterioration (damage) of the secondary battery 31 rather than causing the charging rate of the secondary battery 31 to reach the target charging rate.

Further, the temporary charging current value I_pre is obtained by the following equation (2).

  The control unit 12 compares the temporary charging current value I_pre thus obtained with the threshold value 1C, and if the temporary charging current value I_pre is smaller than the threshold value 1C, the temporary charging current value I_pre is controlled to control the secondary battery 31. If the temporary charging current value I_pre is equal to or greater than the threshold value 1C, the threshold value 1C is adopted as the charging current for controlling the secondary battery 31 and controlled. When control is performed with the charging current determined in this way, the charging current gradually changes as shown in FIG.

As shown in FIG. 2C, the secondary battery 31 in which the charging current is controlled as described above takes a time t required for the output of the windmill from time 0 to time t to be reduced to the target output. The secondary battery 31 reaches the target charging rate. When the secondary battery 31 reaches the target charging rate, charging / discharging is stopped. After it is detected that the wind turbine generator 2 has reached the target output, smoothing control by the secondary battery 31 is performed.
By controlling the charging rate of the secondary battery 31 to maintain the target charging rate in this way, the stability of the system increases after time t after the completion of the windmill output reduction. Moreover, when the charging rate of the secondary battery 31 maintains the target charging rate, the secondary battery 31 can be smoothed with a minimum charge / discharge, and the progress of deterioration of the secondary battery 31 can be prevented.

Below, the effect | action of the master controller 10 concerning this embodiment is demonstrated.
When normal operation is being performed (step SA1 in FIG. 3), it is determined whether an output reduction command has been acquired (step SA2 in FIG. 3). If the output reduction command has not been acquired (NO in step SA2 in FIG. 3), the determination as to whether the output reduction command has been acquired is repeated. The power system 6 supervisor issues an output reduction command for designating a predetermined output limit value for system stabilization, and the master controller 10 inputs the output reduction command. When the output reduction command is acquired (YES in step SA2 in FIG. 3), it is determined whether or not the charging rate of the secondary battery 31 is larger than the target charging rate SOC 50% (step SA3 in FIG. 3).

When it is determined that the charging rate of the secondary battery 31 is equal to or less than the target charging rate SOC 50% (NO in step SA3 in FIG. 3), charging is performed at a rate of charging current 1C or less (step SA4 in FIG. 3). Step SA3 in FIG. 3 is repeated.
When it is determined that the charging rate of the secondary battery 31 is greater than the target charging rate SOC 50% (YES in step SA3 in FIG. 3), charging / discharging of the secondary battery 31 is stopped (step SA5 in FIG. 3). It is determined whether or not the output reduction of the wind turbine generator 2 has been completed (step SA6 in FIG. 3). When it is determined that the output reduction of the wind turbine generator 2 is not completed, this determination is repeated. When it is determined that the output reduction of the wind turbine generator 2 is completed, the leveling operation is started ( Step SA7 in FIG.

  When the leveling operation is started (step SB1 in FIG. 4), it is determined whether or not the output reduction command of the wind turbine generator 2 has been canceled (step SB2 in FIG. 4). When the output reduction command of the wind power generator 2 has not been released (NO in step SB2 in FIG. 4), this determination is repeated, and when the output reduction command of the wind power generator 2 has been released (in FIG. 4) YES in step SB2), charging / discharging of the secondary battery 31 is stopped (step SB3 in FIG. 4). Thereafter, the transition control of the wind turbine generator 2 is performed to determine whether or not the transition is completed (step SB4 in FIG. 4), and when the transition is completed, the normal operation is started (in FIG. 4). Step SB5).

As described above, according to the master controller 10 according to the present embodiment, the power generation system 1 including the master controller 10, the control method, and the control program, when the output reduction command for the power system 6 is acquired, the output reduction command Therefore, if the current value that is the current charging rate of the secondary battery 31 is determined to be less than or equal to the target charging rate, the secondary battery 31 sets the target battery to the target output. The secondary battery 31 is charged with at least a part of the surplus output until the charging rate is reached.
As described above, the secondary battery 31 is operated in a desirable state by storing a part of the output of the wind turbine generator 2 that has been surplus and discarded in the past, and charging control so as to maintain the target charging rate. The Thereby, it is possible to prevent the charging of the secondary battery 31 from abruptly progressing to reach full charging, and to prevent the charging function from stopping and the progress of deterioration of the power storage device.

  In the above-described embodiment, the output reduction command of the power system 6 has been described as being issued by a supervisor who monitors the power system 6, but is not limited to this, and the master controller 10 is connected to the power system 6 side. It is good also as starting charging / discharging control by acquiring the output reduction instruction | command.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. The power generation system 1 ′ according to the second embodiment includes, as power storage devices, a first power storage device 31a that is excellent in suppressing short-period output fluctuations and a second power storage device 31b that is excellent in suppressing long-period output fluctuations. This is different from the first embodiment in that Hereinafter, description of points common to the first embodiment will be omitted, and different points will be mainly described.

FIG. 5 shows a schematic configuration of the power generation system 1 ′ according to the present embodiment.
The power generation system 1 ′ includes a first power storage device 31a and a second power storage device 31b.
The first power storage device 31a is controlled similarly to the secondary battery 31 described in the first embodiment, and the difference between the output of the wind power generator 2 and the target output targeted by the output reduction command. The charging is controlled so that at least a part of the output of the battery is charged and the charging rate becomes the target charging rate. The first power storage device 31a is a battery that has an advantage in suppressing short-term output fluctuations, and for example, a lithium ion battery or the like is used.
The second power storage device 31b is a battery that has an advantage in suppressing long-period output fluctuations. For example, a lead battery, a sodium / sulfur battery (NAS battery (registered trademark)), or the like is used. The second power storage device 31b is a power storage device that is controlled so as to charge the surplus output of the wind turbine generator 2 as much as possible when an output reduction command is detected.

Control part 12 'makes 2nd electrical storage apparatus 31b charge until the charge rate of 2nd electrical storage apparatus 31b will be in a predetermined full charge state, when the output reduction command of electric power system 6 is acquired.
In addition, when the control unit 12 ′ detects that the charging rate of the second power storage device 31 b has become a charging rate lower by a predetermined amount than the predetermined full charge state, the control unit 12 ′ issues a command to reduce the output of the wind power generator 2. Output.

FIG. 6 is a functional block diagram of the control unit 12 ′. The combined output P_total_measure is calculated based on the output of the wind power generator 2 and the charge amounts of the first power storage device 31a and the second power storage device 31b. A difference between the combined output P_total_measure and the target output P_total_target is a demand value P_dem_exp, and a command value for the second power storage device 31b is limited and output by a limit R that can be charged up to a predetermined fully charged state.
Further, an output that cannot be fully charged by the second power storage device 31b is output as an output command P_dem_wtg for the wind turbine generator 2. The limit R is a limit applied to the second power storage device 31b. If the charging rate increases, the value of the limit R decreases and the chargeable amount decreases.

Below, the effect | action of electric power generation system 1 'which concerns on this embodiment is demonstrated using FIG.
An alternate long and short dash line indicates a state of output limitation of the wind power generator 2 when the second power storage device 31b is provided, and a solid line indicates a case where the second power storage device 31b is not provided (for example, the first embodiment). The dotted line is a target combined output that is targeted by the wind power generator 2, the first power storage device 31a, and the second power storage device 31b.

  When the output reduction command is acquired at time t0 and the output limited operation is started, the first power storage device 31a is controlled as described in the first embodiment. The second power storage device 31b determines whether or not the charging rate of the second power storage device 31b has reached a charging rate that is a predetermined amount lower than a predetermined full charge state, and is charged a predetermined amount lower than a predetermined full charge state If the rate has not reached, the output of the wind turbine generator 2 is not reduced, and the second power storage device 31b is charged until the charge rate reaches a charge rate that is a predetermined amount lower than a predetermined full charge state. . Then, even if the output of the wind power generator 2 is not reduced, the output to the power system 6 is reduced, and a composite output such as a target composite output indicated by a dotted line in FIG. 7A is obtained. Further, as shown in FIG. 7B, the charging rate of the second power storage device 31b increases.

When it is detected that the charging rate of the second power storage device 31b has reached a charging rate that is a predetermined amount lower than a predetermined full charge state, the wind power generator 21 An output command value for reducing the output of 2 is output. When the wind farm controller 21 acquires the output command value, the wind farm controller 21 reduces the output of the wind power generator 2 based on the output command value via the wind power generation controller 20. Then, as indicated by the alternate long and short dash line in FIG. 7A, the output of the wind turbine generator 2 is reduced after time t1.
By reducing the output of the wind turbine generator 2 and charging by the second power storage device 31b, an output that matches the target combined output is obtained at time t2.
When the output output to the power system 6 side matches the target combined output, smoothing is started, and smoothing control by the first power storage device 31a and the second power storage device 31b is started.

  Even after the completion of the control for reducing the output of the wind turbine generator 2, the output of the wind generator 2 slightly depends on the wind speed fluctuation blown into the corresponding wind generator 2. Therefore, as shown in FIG. 7A, the wind power generator 2 may experience output fluctuation, but if the second power storage device 31b does not reach a predetermined full charge state, the first power storage device The second power storage device 31b is charged in preference to 31a. At time t3, when the charging rate of second power storage device 31b reaches a predetermined full charge state, charging of second power storage device 31b is completed, and charging / discharging of second power storage device 31b is stopped. After time t3, smoothing control is performed by the first power storage device 31a.

  As described above, according to the master controller 10 according to the present embodiment, the power generation system 1 including the master controller 10, the control method, and the control program, control for reducing the output of the wind power generator 2 is not performed. The target combined output obtained by the output of the wind power generator 2 and the amount of charge of the second power storage device 31b can be gradually reduced by charging with the second power storage device 31b excellent in suppressing long-period output fluctuations. Thereby, since the control which reduces the output of the wind power generator 2 can be delayed, a part of output of the wind power generator 2 thrown away conventionally can be stored more, and the amount of electric power sales increases.

1 Power generation system 2 Wind power generator (power generator)
3 Power storage device 6 Power system 10 Master controller (control device)
11. Determination unit (determination means)
12 Control unit (control means)
30 Battery controller 31 Secondary battery (power storage device)

Claims (8)

A control device that controls charging / discharging of a power storage device that is connected to a power system and connected to a power generation device that generates power by natural energy,
When obtaining an output reduction command of the power system,
Determination means for determining whether or not a current value which is a current charging rate of the power storage device is larger than a target charging rate of the power storage device;
As a result of the determination, when it is determined that the current value of the power storage device is equal to or less than the target charging rate, at least an output of a difference between the output of the power generation device and the target output targeted by the output reduction command Control unit for charging a part of the power storage device and charging so that a charge rate of the power storage device becomes the target charge rate ;
The control means calculates a time required for the output of the power generation device to be reduced to the target output at a predetermined output reduction rate, and the charge rate of the power storage device is calculated as the target charge rate over the required time. A control device that controls to be The control device according to claim 1, wherein the control unit charges the power storage device with a charging current value equal to or less than a predetermined threshold that does not affect deterioration of the power storage device. The control means calculates the temporary charging current value based on the difference between the current value and the target charging rate and the required time, and when the temporary charging current value is smaller than the predetermined threshold, the charging current of the charging current value of the calculated provisionally by charging the power storage device, according to claim 2 for charging the power storage device when the charging current value of the temporary value is equal to or larger than the threshold value by the charging current of the threshold Control device. The power storage device includes a first power storage device excellent in suppressing short-term output fluctuations and a second power storage device excellent in suppressing long-cycle output fluctuations,
When obtaining an output reduction command from the power system,
Wherein, until said charging rate of the second power storage device becomes the predetermined fully charged state, the control apparatus according to any one of claims 1 to 3 for charging the second power storage device. The control means outputs a command to reduce the output of the power generation device when detecting that the charging rate of the second power storage device has become a charging rate lower by a predetermined amount than the predetermined full charge state. Item 5. The control device according to Item 4 . A power generation system comprising the control device according to any one of claims 1 to 5 and a power storage device. A control method that controls charging / discharging of a power storage device connected to a power generation device that is connected to a power system and that generates power by natural energy,
When obtaining an output reduction command of the power system,
A first step of determining whether a current value that is a current charging rate of the power storage device is larger than a target charging rate of the power storage device;
As a result of the determination, when it is determined that the current value of the power storage device is equal to or less than the target charging rate, at least an output of a difference between the output of the power generation device and the target output targeted by the output reduction command was charged portions to the power storage device, the charging rate of the power storage device to have a second process of charging the power storage device such that the target charging rate,
In the second step, a time required for the output of the power generation device to be reduced to the target output at a predetermined output reduction rate is calculated, and a charging rate of the power storage device is calculated as the target charge over the required time. A control method that controls the rate . A control program that controls charging / discharging of a power storage device connected to a power generation device that is connected to a power system and generates power by natural energy,
When obtaining an output reduction command of the power system,
A first process for determining whether or not a current value that is a current charging rate of the power storage device is larger than a target charging rate of the power storage device;
As a result of the determination, when it is determined that the current value of the power storage device is equal to or less than the target charging rate, at least an output of a difference between the output of the power generation device and the target output targeted by the output reduction command A part of the power storage device is charged, the power storage device is charged so that a charge rate of the power storage device becomes the target charge rate, and an output of the power generation device is reduced to the target output at a predetermined output reduction rate is calculated the required time it takes to be a control program for executing the second processing charge rate of the power storage device over the required time that control such that the target charging rate to the computer.

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