JP2018152943A - Control device, control method and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage battery control device for smoothing output fluctuation of a renewable energy power generation device and maintaining the remaining charge amount of the storage battery at an appropriate value. An output power acquisition unit that acquires output power of a renewable energy power generation device, a charge remaining amount acquisition unit that acquires a remaining charge amount of a storage battery, and a target value of the remaining charge amount and the remaining charge amount of the storage battery. Based on the charge remaining amount adjustment value, which is obtained by amplifying the deviation from the target remaining charge amount with a predetermined gain based on the output power of the renewable energy power generator, and the power generation target which is the target value of the output power of the renewable energy power generator. A combined output target calculation unit that calculates a combined output target that is a combined output power target value of the renewable energy power generator and the storage battery; and a charge/discharge control unit that controls charging/discharging of the storage battery based on the combined output target. Prepare [Selection diagram] Figure 2

Description

  TECHNICAL FIELD The present invention relates to a storage battery control device, a control method, and a computer program, and in particular, a storage battery that stores electric power generated by a renewable energy power generation device for output fluctuations of the renewable energy power generation device that generates power using renewable energy. The present invention relates to a storage battery control device, a control method, and a computer program for smoothing by charging and discharging.

  In recent years, the use of power generation devices that generate power using renewable energy such as sunlight and wind power (hereinafter referred to as “renewable energy power generation devices”) has been promoted. However, the renewable energy power generation apparatus has unstable output power, which may cause voltage fluctuations and frequency fluctuations of the connected power system.

  In view of this, a system has been developed that charges and discharges electric power to a storage battery to compensate for output fluctuations of a renewable energy power generation apparatus and supplies electric power in which fluctuations are smoothed to an electric power system (see, for example, Patent Document 1). .

  In the system described in Patent Document 1, charging / discharging of the storage battery is controlled so as to maintain the state of charge (SOC) of the storage battery at an appropriate value while smoothing the output fluctuation of the renewable energy power generation device. Is done.

  That is, in Patent Document 1, a value obtained by smoothing the generated power and a value obtained by amplifying a deviation between the measured value of the remaining charge amount and the target value of the remaining charge amount with a predetermined gain (hereinafter, “charge remaining amount adjustment value”). Is used as a combined output target, and charging / discharging of the storage battery is controlled so that the total value of the output power of the renewable energy power generation apparatus and the storage battery approaches the combined output target. In Patent Document 1, in particular, as the deviation between the measured value of the remaining charge and the target value of the remaining charge increases, the gain is increased to control charging / discharging of the storage battery.

JP 2010-22122 A

  However, in the system described in Patent Document 1, it may be difficult to adjust the gain appropriately. In other words, in this system, when the deviation between the measured value of the remaining charge and the target value of the remaining charge is large, the gain increases, so the remaining charge adjustment value becomes too large, and the generated output of the combined output target The deviation from the smoothed value becomes too large. As a result, when the deviation is large, control that prioritizes adjustment of the remaining charge of the storage battery is performed rather than smoothing the generated power.

  For this reason, for example, a situation occurs in which the remaining charge adjustment value becomes large even though the output of the renewable energy power generation device is small, such as at midnight. In such a situation, charging from the power system to the storage battery (power purchase) or reverse power flow from the storage battery to the power system may be caused. Therefore, from the original purpose of smoothing output fluctuation of the renewable energy power generation device Is not desirable.

  The present invention has been made in view of such circumstances, and a storage battery control device capable of maintaining the remaining charge of the storage battery at an appropriate value while smoothing output fluctuations of the renewable energy power generation device, It is an object to provide a control method and a computer program.

  In order to achieve the above object, a control device according to an embodiment of the present invention uses an output fluctuation of a renewable energy power generation device that generates power using renewable energy, and generates electric power generated by the renewable energy power generation device. A control device for the storage battery for smoothing by charging / discharging the storage battery for storing power, an output power acquisition unit for acquiring output power of the renewable energy power generation device, and a remaining charge for acquiring the remaining charge of the storage battery An amount acquisition unit, and a charge remaining amount adjustment obtained by amplifying a deviation between a target charge remaining amount that is a target value of the remaining charge amount and the remaining charge amount of the storage battery by a predetermined gain based on output power of the renewable energy power generation device Value and a power generation target that is a target value of output power of the renewable energy power generation device, a combined output power of the renewable energy power generation device and the storage battery Comprising of a combined output target calculation unit that calculates a combined output target is the target value, based on the combined output target, and a charging and discharging control unit for controlling the charging and discharging of the battery.

  According to another embodiment of the present invention, there is provided a control method for detecting output fluctuations of a renewable energy power generation device that generates power using renewable energy by charging and discharging a storage battery that stores electric power generated by the renewable energy power generation device. A method for controlling the storage battery for smoothing, the step of obtaining output power of the renewable energy power generation device, the step of obtaining a remaining charge amount of the storage battery, the remaining charge amount and the charging of the storage battery A charge remaining amount adjustment value obtained by amplifying a deviation from a target remaining charge amount, which is a remaining amount target value, with a predetermined gain based on output power of the renewable energy power generation device, and a target of output power of the renewable energy power generation device Based on the power generation target that is a value, a combined output target that is a target value of the combined output power of the renewable energy power generation device and the storage battery is calculated. A method, based on the synthesized output target, and controlling the charging and discharging of the battery.

  According to another embodiment of the present invention, there is provided a computer program that detects output fluctuations of a renewable energy power generation device that generates power using renewable energy by charging and discharging a storage battery that stores electric power generated by the renewable energy power generation device. A computer program for smoothing, comprising: an output power acquisition unit that acquires output power of the renewable energy power generation device; a remaining charge acquisition unit that acquires a remaining charge of the storage battery; and the charging A remaining charge adjustment value obtained by amplifying a deviation between a remaining charge and a target remaining charge that is a target value of the remaining charge of the storage battery by a predetermined gain based on output power of the renewable energy power generator, and the renewable energy Based on the power generation target that is the target value of the output power of the power generation device, the combination of the renewable energy power generation device and the storage battery And combining output target calculation unit that calculates a a target value of the output power combining output target, based on the combined output target, a computer program for functioning as a charge and discharge control unit for controlling the charging and discharging of the battery.

  The computer program according to the present invention can be distributed via a computer-readable non-transitory recording medium such as a CD-ROM (Compact Disc-Read Only Memory) or a communication network such as the Internet. Needless to say. Further, the present invention can be realized as a semiconductor integrated circuit that realizes part or all of the control device, or as a system including the control device.

  ADVANTAGE OF THE INVENTION According to this invention, the charge remaining amount of a storage battery can be maintained at an appropriate value, smoothing the output fluctuation | variation of a renewable energy electric power generating apparatus.

It is a figure which shows the structure of the electric power system which concerns on Embodiment 1 of this invention. It is a block diagram which shows the functional structure of the power conditioner which concerns on Embodiment 1 of this invention. It is a control block diagram which shows the charge / discharge control of the storage battery by the power conditioner shown in FIG. It is a flowchart which shows the process sequence of the power conditioner which concerns on Embodiment 1 of this invention. It is a control block diagram which shows the charging / discharging control of the storage battery by the conventional control apparatus. It is a figure which shows the simulation result by the conventional control apparatus. It is a figure which shows the simulation result by the power conditioner which concerns on Embodiment 1 of this invention. It is a figure which shows the simulation result by the conventional control apparatus. It is a figure which shows the simulation result by the power conditioner which concerns on Embodiment 1 of this invention. It is a figure which shows the simulation result by the conventional control apparatus. It is a figure which shows the simulation result by the power conditioner which concerns on Embodiment 1 of this invention. It is a figure which shows the simulation result by the conventional control apparatus. It is a figure which shows the simulation result by the power conditioner which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the time change of the charge remaining amount of a storage battery.

[Outline of Embodiment of the Present Invention]
First, the outline of the embodiment of the present invention will be listed and described.
(1) A control device according to an embodiment of the present invention is configured to charge a storage battery that stores power generated by the renewable energy power generation device, based on output fluctuations of the renewable energy power generation device that generates power using renewable energy. The storage battery control device for smoothing by discharging, an output power acquisition unit that acquires output power of the renewable energy power generation device, a remaining charge acquisition unit that acquires a remaining charge of the storage battery, A charge remaining amount adjustment value obtained by amplifying a deviation between the remaining charge amount and a target remaining charge amount that is a target value of the remaining charge amount of the storage battery by a predetermined gain based on output power of the renewable energy power generation device; and the regeneration Based on the power generation target that is the target value of the output power of the renewable energy power generation device, the composite that is the target value of the combined output power of the renewable energy power generation device and the storage battery Comprising a composite output target calculation unit that calculates a target force, based on the combined output target, and a charging and discharging control unit for controlling the charging and discharging of the battery.

  According to this configuration, the combined output target is calculated based on the power generation target and the remaining charge adjustment value, and charging / discharging of the storage battery is controlled based on the combined output target. The power generation target is a value used for smoothing the output fluctuation of the renewable energy power generation apparatus. On the other hand, the remaining charge adjustment value is a value used to make the remaining charge close to the target remaining charge. The remaining charge adjustment value is a value obtained by amplifying the deviation between the remaining charge and the target remaining charge with a gain based on the output power. That is, the remaining charge adjustment value is a value calculated according to the output power of the power generator. For this reason, although the output power of the power generation device is small, the remaining charge adjustment value can be prevented from increasing, and the original purpose of smoothing the generated power using renewable energy is achieved. be able to. Therefore, the remaining charge of the storage battery can be maintained at an appropriate value while smoothing the output fluctuation of the renewable energy power generation device.

  (2) Preferably, the above-described control device further includes a power generation target acquisition unit that acquires, as the power generation target, a value obtained by smoothing the output power of the renewable energy power generation device acquired by the output power acquisition unit, The combined output target calculation unit, based on the power generation target based on the remaining charge adjustment value obtained by amplifying the deviation between the remaining charge and the target remaining charge by the predetermined gain based on the power generation target, A composite output target is calculated.

  According to this configuration, the power generation target is a value obtained by smoothing the output power of the renewable energy power generation apparatus. Further, the remaining charge adjustment value is a value calculated according to the power generation target. For this reason, although the output power of the power generation device is small, the remaining charge adjustment value can be prevented from increasing, and the original purpose of smoothing the generated power using renewable energy is achieved. be able to.

  (3) More preferably, the predetermined gain is set to a value proportional to the power generation target.

  According to this configuration, the remaining charge adjustment value can be increased as the power generation target is larger. That is, the remaining charge adjustment value can be increased as the value obtained by smoothing the output power of the renewable energy power generation device increases. Thereby, the charge remaining amount of the storage battery can be maintained at an appropriate value while smoothing the output fluctuation of the renewable energy power generation apparatus.

  (4) The combined output target calculation unit calculates the power generation target as the combined output target when the remaining charge is included in a target remaining charge range including the target remaining charge. May be.

  According to this configuration, when the remaining charge amount is included in the target remaining charge range, this is the same as setting the remaining charge amount adjustment value to zero. That is, control for maintaining the remaining charge of the storage battery at the target remaining charge is not performed. Thereby, when the remaining charge amount is included in the target remaining charge range, the output of the renewable energy power generator can be preferentially smoothed.

  (5) Preferably, at least one of the upper limit value and the lower limit value of the target remaining charge range has hysteresis.

  According to this configuration, at least one of the upper limit value and the lower limit value of the target remaining charge range has hysteresis. For this reason, even when the remaining charge level changes in the vicinity of the upper limit value or the lower limit value, switching between execution and non-execution of control for maintaining the remaining charge amount of the storage battery at the target remaining charge amount is frequently performed. Can prevent it from happening.

  (6) In the control method according to another embodiment of the present invention, an output fluctuation of a renewable energy power generation device that generates power using renewable energy is stored in a storage battery that stores electric power generated by the renewable energy power generation device. A method for controlling the storage battery for smoothing by charging and discharging, the step of obtaining output power of the renewable energy power generation device, the step of obtaining the remaining charge of the storage battery, the remaining charge and the A charge remaining amount adjustment value obtained by amplifying a deviation from a target charge remaining amount, which is a target value of a remaining charge of the storage battery, with a predetermined gain based on output power of the renewable energy power generation device, and an output of the renewable energy power generation device Based on a power generation target that is a target value of power, a combined output target that is a target value of a combined output power of the renewable energy power generation device and the storage battery is determined. A step of leaving, on the basis of the combined output target, and controlling the charging and discharging of the battery.

  This control method includes steps corresponding to the respective processing units included in the above-described control device as constituent elements. For this reason, there can exist an effect | action and effect similar to the above-mentioned control apparatus.

  (7) A computer program according to another embodiment of the present invention provides an output fluctuation of a renewable energy power generation device that generates power using renewable energy, and a storage battery that stores electric power generated by the renewable energy power generation device. A computer program for smoothing by charging and discharging, the computer comprising an output power acquisition unit for acquiring output power of the renewable energy power generation device, and a remaining charge acquisition unit for acquiring a remaining charge of the storage battery A charge remaining amount adjustment value obtained by amplifying a deviation between the remaining charge amount and a target remaining charge amount that is a target value of the remaining charge amount of the storage battery by a predetermined gain based on output power of the renewable energy power generation device; and Based on a power generation target that is a target value of output power of the renewable energy power generation device, the renewable energy power generation device and the power storage A combined output target calculation unit that calculates a combined output target that is a target value of the combined output power, and a computer program that functions as a charge / discharge control unit that controls charging / discharging of the storage battery based on the combined output target is there.

  According to this computer program, the computer can be caused to function as each processing unit included in the above-described control device. For this reason, there can exist an effect | action and effect similar to the above-mentioned control apparatus.

[Details of the embodiment of the present invention]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. The invention is specified by the claims. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept of the present invention are not necessarily required to achieve the object of the present invention. It will be described as constituting a preferred form.

  Moreover, the same code | symbol is attached | subjected to the same component. Since their functions and names are also the same, their description will be omitted as appropriate.

(Embodiment 1)
[Entire configuration of power system]
FIG. 1 is a diagram showing a configuration of a power system 1 according to Embodiment 1 of the present invention.
The power system 1 is a system for backflowing the power generated by the solar power generation device 10 to the power system 30 connected to the power system 1. The power system 1 includes a solar power generation device 10, a power conditioner 11, a storage battery 20, and a power conditioner 21.

  The solar power generation device 10 is an example of a renewable energy power generation device that generates power using renewable energy, and converts the solar energy into DC power. The solar power generation device 10 is connected to the distribution line 40 via the power conditioner 11.

  The power conditioner 11 converts the direct current output from the solar power generation device 10 into alternating current and outputs the alternating current to the distribution line 40.

  The storage battery 20 includes secondary batteries such as a redox flow (RF) battery, a lithium ion battery, a molten salt battery, and a lead storage battery. The storage battery 20 stores the power generated by the solar power generation device 10. The storage battery 20 is connected to the distribution line via the power conditioner 21. Note that a flywheel battery or a pumped-water generator may be used instead of these secondary batteries.

  The power conditioner 21 converts alternating current flowing through the distribution line 40 into direct current, and charges the storage battery 20 with direct current power. Further, the power conditioner 21 converts the direct current discharged from the storage battery 20 into alternating current and outputs the alternating current to the distribution line 40.

  The combined output of the electric power output from the solar power generation device 10 and the storage battery 20 is reversely flowed to the electric power system 30 connected to the electric power system 1.

  Note that the configuration of the power system 1 is not limited to that shown in FIG. 1, and may include other power generation devices such as a gas power generation device and a fuel cell. Further, the power system 1 may include a power generation device that generates power using other renewable energy such as a wind power generation device or a tidal power generation device. The power system 1 may include a facility such as a factory that consumes power.

[Configuration of power conditioner 21]
FIG. 2 is a block diagram showing a functional configuration of the power conditioner 21 according to Embodiment 1 of the present invention.

  The power conditioner 21 functions as a control device for the storage battery 20. The control device controls charging / discharging of the storage battery 20 in order to smooth the output fluctuation of the solar power generation device 10. In addition to the configuration shown in FIG. 2, the power conditioner 21 has a bi-directional AC / DC converter function that is a function of the original power conditioner.

  Referring to FIG. 2, a power conditioner 21 that functions as a control device includes an active power detector 22, a smoothing processing unit 23, a target remaining charge acquisition unit 24, a remaining charge detector 25, and a combined output. The target calculation part 26, the charging / discharging control part 27, and the AC-DC converter 28 are provided.

  The active power detector 22 functions as an output power acquisition unit, and detects, from the power conditioner 11, the active power at the time t of the solar power generation device 10 as output power p (t) [kW].

  The smoothing processing unit 23 functions as a power generation target acquisition unit, and acquires a power generation target ptarget (t) [kW] that is a target value of output power of the solar power generation device 10 at time t. Specifically, the smoothing processing unit 23 calculates a value obtained by smoothing the output power p (t) of the photovoltaic power generation apparatus 10 detected by the active power detector 22 as a power generation target. For example, when the current time is t, the average value of the output powers p (t−T) to p (t) of the photovoltaic power generation apparatus 10 from time (t−T) to time t is determined at time t. Calculated as the power generation target ptarget (t) of the solar power generation device 10.

  The target charge remaining amount acquisition unit 24 acquires a target charge remaining amount qtarget [kWh] that is a target value of the remaining charge amount of the storage battery 20. In order to prevent the storage battery 20 from being completely discharged or fully charged, or to delay the deterioration of the storage battery 20 and ensure the life of the storage battery 20, it is necessary to keep the remaining charge of the storage battery 20 within a certain range. . For this reason, a value within the range is determined in advance as the target remaining charge amount qtarget. The target remaining charge acquisition unit 24 may acquire the target remaining charge qtarget by reading it from a storage device (not shown). Note that the target remaining charge qtarget is a constant value regardless of the time, but may change with time.

  The remaining charge detector 25 functions as a remaining charge acquisition unit, and acquires the remaining charge q (t) [kWh] at the time t of the storage battery 20.

  The combined output target calculation unit 26 smoothes the output fluctuation of the solar power generation device 10 and makes the combined output of the solar power generation device 10 and the storage battery 20 close to the target remaining charge qtarget. A composite output target that is a target value of power is calculated.

  That is, the composite output target calculation unit 26 determines a deviation (qtarget−q (t)) between the remaining charge q (t) of the storage battery 20 and the target remaining charge qtarget based on the output power of the photovoltaic power generator 10. Based on the remaining charge adjustment value k (qtarget−q (t)) obtained by amplification with the gain k and the power generation target ptarget (t), the target of the combined output power of the photovoltaic power generation apparatus 10 and the storage battery 20 A composite output target u (t) that is a value is calculated.

  For example, the combined output target u (t) at time t can be calculated by the following equation 1.

      u (t) = ptarget (t) −k (qtarget−q (t)) (Formula 1)

  Here, the gain k is defined by Equation 2 below. However, the gain k1 is a predetermined constant.

      k = k1 × ptarget (t) (Formula 2)

  That is, the gain k is proportional to the power generation target ptarget (t) of the solar power generation device 10. Thereby, when the output power of the photovoltaic power generation apparatus 10 is large, the weight of the remaining charge adjustment value is increased, and when the output power of the photovoltaic power generation apparatus 10 is small, the weight of the remaining charge adjustment value is increased. The composite output target u (t) can be calculated after making it smaller.

  The charge / discharge control unit 27 controls charging / discharging of the storage battery 20 based on the combined output target u (t) determined by the combined output target calculating unit 26. That is, the charge / discharge control unit 27 controls the charge / discharge of the storage battery 20 so that the sum of the output power p (t) of the solar power generation device 10 and the output of the storage battery 20 becomes the combined output target u (t). .

  Specifically, when u (t)> p (t), the charge / discharge control unit 27 supplies (u (t) −p (t)) [kW] power from the storage battery 20 via the power conditioner 21. Then, the distribution line 40 is discharged. Thereby, the combined output u (t) of the power p (t) output from the solar power generation device 10 and the power discharged from the storage battery 20 (u (t) -p (t)) via the distribution line 40 Control is performed so as to flow backward to the interconnected power system 30.

  Moreover, the charging / discharging control part 27 makes the storage battery 20 charge the electric power of (p (t) -u (t)) [kW], when u (t) <p (t). As a result, the combined output u (t) obtained by removing the power (p (t) -u (t)) charged in the storage battery 20 from the power p (t) output from the solar power generation device 10 is connected to the distribution line 40. Thus, control is performed so as to reversely flow to the interconnected power system 30.

  The AC-DC converter 28 converts the alternating current flowing through the distribution line 40 into direct current in accordance with an instruction from the charge / discharge control unit 27, and charges the storage battery 20 with direct-current power. The AC-DC converter 28 converts the direct current discharged from the storage battery 20 into alternating current and outputs the alternating current to the distribution line 40.

[Control block diagram]
FIG. 3 is a control block diagram showing charge / discharge control of the storage battery 20 by the power conditioner 21 shown in FIG.

  In the control block diagram of FIG. 3, the processing executed by the combined output target calculation unit 26 and the charge / discharge control unit 27 in the configuration of the power conditioner 21 shown in FIG. 2 is shown in the control block diagram.

  Referring to FIG. 3, the power conditioner 21 includes an active power detector 22, a smoothing processing unit 23, a remaining charge detector 25, an AC-DC converter 28, a subtractor 26A, and a multiplier 26B. A proportional device 26C, a subtractor 26D, a combined output value command device 26E, a subtractor 27A, and a charge / discharge command device 27B.

The active power detector 22, the smoothing processing unit 23, the remaining charge detector 25, and the AC-DC converter 28 are the same as those shown in FIG. Therefore, detailed description thereof will not be repeated here.
In FIG. 3, the target charge remaining amount acquisition unit 24 illustrated in FIG. 2 is not shown.

The subtractor 26A, the multiplier 26B, the proportional unit 26C, the subtractor 26D, and the combined output value command unit 26E constitute the combined output target calculation unit 26.
The subtractor 27 </ b> A and the charge / discharge command unit 27 </ b> B constitute a charge / discharge control unit 27.

  The subtractor 26A calculates a deviation (qtarget−q (t)) between the remaining charge q (t) of the storage battery 20 detected by the remaining charge detector 25 and the target remaining charge qtarget.

  The multiplier 26B multiplies the deviation calculated by the subtractor 27A and the power generation target ptarget (t) calculated by the smoothing processing unit 23, and outputs a multiplication result ptarget (t) (qtarget-q (t)). To do.

  The proportional unit 26C outputs a value proportional to the multiplication result of the multiplier 26B. That is, the proportional unit 26C outputs a value k1 × ptarget (t) (qtarget−q (t)) obtained by multiplying the multiplication result by a predetermined gain k1.

  The subtractor 26D subtracts the output value k1 × ptarget (t) (qtarget−q (t)) of the proportional device 26C from the power generation target ptarget (t) calculated by the smoothing processing unit 23 (ptarget (t)). -K1 * ptarget (t) (qtarget-q (t))) is output. It can be seen from Equation 1 and Equation 2 described above that this value is equal to the combined output target u (t).

  The combined output value command unit 26E outputs the output value of the subtractor 26D as a combined output target u (t).

  The subtractor 27A subtracts the output power p (t) of the photovoltaic power generation apparatus 10 detected by the active power detector 22 from the combined output target u (t) output from the combined output value command unit 26E (p (t ) -U (t)).

  The charge / discharge commander 27B transmits a charge / discharge command for the storage battery 20 based on the output value (p (t) -u (t)) of the subtractor 27A to the AC-DC converter 28.

  That is, if (p (t) −u (t)) <0, the charge / discharge commander 27B issues a command for discharging the power of (u (t) −p (t)) to the storage battery 20 as AC. -Transmit to DC converter 28. The AC-DC converter 28 discharges the electric power of (u (t) -p (t)) to the storage battery 20 based on the command, and converts the discharged electric power from direct current to alternating current. Shed.

In addition, the charge / discharge commander 27B issues a command for charging the storage battery 20 with the power of (p (t) -u (t)) if AC is (p (t) -u (t))> 0. -Transmit to DC converter 28. The AC-DC converter 28 acquires (p (t) -u (t)) power from the distribution line 40 based on the command, converts the acquired power from alternating current to direct current, and then distributes the distribution line 40. To accumulate.
The charge / discharge commander 27B does nothing if p (t) -u (t) = 0.

[Processing flow of power conditioner 21]
FIG. 4 is a flowchart showing a processing procedure of the power conditioner 21 according to Embodiment 1 of the present invention.

  The active power detector 22 detects the active power at the time t of the photovoltaic power generation apparatus 10 as the output power p (t) from the power conditioner 11 (S1).

  The smoothing processing unit 23 calculates a value (moving average value) obtained by smoothing the output power p (t) of the photovoltaic power generation apparatus 10 detected by the active power detector 22 in the time direction as a power generation target ptarget (t). (S2).

  The remaining charge detector 25 monitors the output power b of the storage battery 20, and calculates the remaining charge q (t) of the storage battery 20 from the integrated value of the output power b up to the current time t (S3).

  The target remaining charge acquisition unit 24 acquires a target remaining charge qtarget that is a target value of the remaining charge of the storage battery 20 from a storage device or the like (S4).

  The combined output target calculation unit 26 calculates a combined output target u (t) based on the power generation target ptarget (t), the remaining charge q (t) of the storage battery 20, and the target remaining charge qtarget (S5). )

  The charge / discharge control unit 27 and the AC-DC converter 28 control charging / discharging of the storage battery 20 based on the combined output target u (t) (S6).

[Results of comparative experiment]
The output adjustment result by the conventional control device and the output adjustment result of the power conditioner 21 according to Embodiment 1 will be described.

  FIG. 5 is a control block diagram showing charge / discharge control of the storage battery 20 by a conventional control device.

The conventional control device 21A includes an active power detector 22, a smoothing processing unit 23, a remaining charge detector 25, an AC-DC converter 28, a subtractor 26A, a proportional device 26F, and a subtractor 26D. A combined output value command device 26E, a subtractor 27A, a charge / discharge command device 27B, and an AC-DC converter 28.
Hereinafter, differences from the control block diagram shown in FIG. 3 will be mainly described.

  The subtractor 26A calculates a deviation (qtarget−q (t)) between the remaining charge q (t) of the storage battery 20 detected by the remaining charge detector 25 and the target remaining charge qtarget.

  The proportional device 26F outputs a value k × (qtarget−q (t)) obtained by multiplying the deviation (qtarget−q (t)) by a predetermined gain k. Here, the predetermined gain k is set to a larger value as (qtarget−q (t)) is larger.

  The subtractor 26D subtracts the output value k (qtarget−q (t)) of the proportional device 26F from the power generation target ptarget (t) calculated by the smoothing processing unit 23 (ptarget (t) −k (qtarget− q (t))).

  In the control device 21A, the value output from the subtractor 26D is set as the combined output target u (t).

  The control device 21A differs from the power conditioner 21 in the method for determining the gain k. That is, in the power conditioner 21, k increases in proportion to the output power p (t) of the photovoltaic power generation apparatus 10 (power generation target ptarget (t)). On the other hand, in the conventional control device 21A, k increases in proportion to the deviation (qtarget-q (t)).

  21 A of control apparatuses perform charging / discharging control of the storage battery 20 so that the sum of the output electric power p (t) of the solar power generation device 10 and the output of the storage battery 20 becomes the composite output target u (t).

Next, simulation results will be described.
First, simulation conditions will be described.
That is, the target charge remaining amount qtarget is set to a value of 50% of the fully charged remaining amount of the storage battery 20. The charge / discharge efficiency of the storage battery 20 is 80%. The output frequency of the combined output target u (t) by the combined output value command unit 26E is set to once / 10 seconds. The maximum rated output of the solar power generation device 10 is 125 kW. The capacity of the storage battery is 125 kW × 4 h. Smoothing of the output power p (t) by the smoothing processing unit 23 is performed by calculating a moving average of p (t) for 1200 seconds. The gain k1 (k1 in Expression 2) multiplied by the proportional device 26C shown in FIG. 3 is k1 = 0.004. The gain k multiplied by the proportional device 26F shown in FIG. 5 is k = 0.1. However, the k is adjusted according to the value of (qtarget−q (t)).

6-13 is a figure which shows the result of the simulation performed on the said conditions.
In each figure, the upper graph shows the output power p (t) of the solar power generation device 10, the power generation target ptarget (t), the output power b (t) of the storage battery 20, the combined output of the solar power generation device 10 and the storage battery 20. The horizontal axis shows time and the vertical axis shows power. Moreover, the lower graph shows the time change of the SOC of the storage battery 20, the horizontal axis shows the time common to the horizontal axis of the upper graph, and the vertical axis shows SOC (%). In addition, the positive of output electric power b (t) represents discharge, and negative represents charging.

(First simulation)
In the first simulation, it is assumed that the solar power generation apparatus 10 has many lamps up and down in fine weather. Further, the SOC of the storage battery 20 at the start of the simulation is 30%.

  6 is a diagram showing a simulation result by the conventional control device 21A, and FIG. 7 is a diagram showing a simulation result by the power conditioner 21 according to the first embodiment.

  As shown in FIG. 6, according to the conventional control device 21 </ b> A, in the time zone 0 to 2500, the output power p (t) of the solar power generation device 10 is positive, but the combined output is negative. This is because the charging of the storage battery 20 is prioritized during this time period because the remaining charge q (t) of the storage battery 20 is significantly different from the target remaining charge qtarget. Moreover, in time zone 35000-40000, although the output electric power p (t) of the solar power generation device 10 is close to 0, it turns out that SOC is rising and the storage battery 20 is charged.

  On the other hand, as shown in FIG. 7, according to the power conditioner 21 according to the first embodiment, in the time zone where the output power p (t) of the solar power generation device 10 is large, such as the time zone 3000 to 8000, The amount of charge of the storage battery 20 is increased, and the SOC is preferentially adjusted. On the other hand, when the output power p (t) of the solar power generation device 10 is close to 0 as in the time zone 35000-40000, the SOC is not adjusted much.

(Second simulation)
In the second simulation, the SOC of the storage battery 20 at the start of the simulation is set to 70%. Other conditions are the same as in the first simulation.

  FIG. 8 is a diagram showing a simulation result by the conventional control device 21A, and FIG. 9 is a diagram showing a simulation result by the power conditioner 21 according to the first embodiment.

  As shown in FIG. 8, according to the conventional control device 21 </ b> A, in the time zone 35000 to 40000, although the output power p (t) of the solar power generation device 10 is close to 0, the SOC is reduced. It can be seen that the storage battery 20 is discharged.

  On the other hand, as shown in FIG. 9, according to the power conditioner 21 according to the first embodiment, when the output power p (t) of the solar power generation device 10 is close to 0 in the time zone 35000 to 40000, There is not much SOC adjustment.

(Third simulation)
In the third simulation, the cloudy sky is assumed, and the SOC of the storage battery 20 at the start of the simulation is 30%.

  FIG. 10 is a diagram showing a simulation result by the conventional control device 21A, and FIG. 11 is a diagram showing a simulation result by the power conditioner 21 according to the first embodiment.

  As shown in FIG. 10, according to the conventional control device 21A, the remaining charge of the storage battery 20 is maintained even when the output power p (t) of the photovoltaic power generation device 10 is small, such as the time zone 0 to 1000. Since the amount q (t) is greatly deviated from the target remaining charge qtarget, the storage battery 20 is actively charged. Therefore, the composite output is negative.

  On the other hand, as shown in FIG. 11, according to the power conditioner 21 according to the first embodiment, in the time zone where the output power p (t) of the solar power generation device 10 is small, such as the time zone 0 to 1000, The SOC adjustment (charging of the storage battery 20) is not performed much.

(Fourth simulation)
In the fourth simulation, the SOC of the storage battery 20 at the start of the simulation is set to 70%. The other conditions are the same as in the third simulation.

  FIG. 12 is a diagram showing a simulation result by the conventional control device 21A, and FIG. 13 is a diagram showing a simulation result by the power conditioner 21 according to the first embodiment.

  In the fourth simulation, the SOC is appropriately adjusted as in the third simulation.

  As a result of the first to fourth simulations, even if the adjustment of the remaining charge of the storage battery 20 is not actively performed when the output power p (t) of the solar power generation device 10 is small, the storage battery 20 It was confirmed that the remaining charge q (t) did not greatly deviate from the target remaining charge qtarget.

[Effect of Embodiment 1]
As described above, according to the first embodiment of the present invention, as shown in Expression 1, the synthesis is performed based on the power generation target ptarget (t) and the remaining charge adjustment value k (qtarget−q (t)). An output target u (t) is calculated. Further, charging / discharging of the storage battery 20 is controlled based on the calculated combined output target u (t). The power generation target ptarget (t) is a value used to smooth the output power p (t) of the solar power generation device 10. On the other hand, the remaining charge adjustment value k (qtarget−q (t)) is a value used to bring the remaining charge q (t) closer to the target remaining charge qtarget. The remaining charge adjustment value k (qtarget−q (t)) is a value obtained by amplifying the deviation between the remaining charge q (t) and the target remaining charge qtarget with a gain k based on the output power p (t). is there. That is, the remaining charge adjustment value k (qtarget−q (t)) is calculated according to the output power p (t) of the solar power generation device 10. For this reason, it is possible to prevent the remaining charge adjustment value k (qtarget−q (t)) from increasing despite the small output power p (t) of the photovoltaic power generation apparatus 10, and renewable energy. It is possible to achieve the original purpose of smoothing the generated power using the. Therefore, the remaining charge q (t) of the storage battery 20 can be maintained at an appropriate value while smoothing the output power p (t) of the solar power generation device 10.

  Further, the smoothing processing unit 23 calculates a value obtained by smoothing the output power p (t) of the solar power generation device 10 as the power generation target ptarget (t). Furthermore, since the gain k is proportional to the power generation target ptarget (t) as shown in Expression 2, the remaining charge adjustment value k (qtarget−q (t)) varies according to the power generation target ptarget (t). For this reason, it is possible to prevent the remaining charge adjustment value k (qtarget−q (t)) from increasing despite the small output power p (t) of the photovoltaic power generation apparatus 10, and renewable energy. It is possible to achieve the original purpose of smoothing the generated power using the.

  Further, since the gain k is proportional to the power generation target ptarget (t), the remaining charge adjustment value k (qtarget-q (t)) can be increased as the power generation target ptarget (t) is larger. That is, the remaining charge adjustment value k (qtarget−q (t)) can be increased as the smoothed value of the output power p (t) of the solar power generation device 10 increases. Thereby, the remaining charge q (t) of the storage battery 20 can be maintained at an appropriate value while smoothing the output power p (t) of the solar power generation device 10.

(Embodiment 2)
In the first embodiment, the charge / discharge control of the storage battery 20 is performed so that the remaining charge q (t) of the storage battery 20 approaches the target remaining charge qtarget. In the second embodiment, an example in which the charge / discharge control of the storage battery 20 is not performed when the remaining charge q (t) of the storage battery 20 is within a certain range will be described.

  The configuration of the power conditioner 21 according to Embodiment 2 is the same as that shown in FIG.

  FIG. 14 is a diagram illustrating an example of a temporal change in the remaining charge q (t) of the storage battery 20, where the horizontal axis indicates time, and the vertical axis indicates the remaining charge q (t) [kWh]. Here, the target remaining charge qtarget is set to 250 kWh.

  The target charge remaining amount acquisition unit 24 acquires a target charge remaining amount range including the target charge remaining amount. For example, the target charge remaining amount acquisition unit 24 acquires the target charge remaining amount range 200 to 300 kWh by reading information on the target charge remaining amount range from a storage device (not shown) or the like.

  When the remaining charge q (t) of the storage battery 20 is included in the target remaining charge range, the combined output target calculation unit 26 outputs the power generation target ptarget (t) calculated by the smoothing processing unit 23 as a combined output. Output as target u (t). That is, the combined output target calculation unit 26 sets the power generation target ptarget (t) as the combined output target u (t) when the remaining charge q (t) of the storage battery 20 is included in the range of 200 to 300 kWh. Output. Such combined output target u (t) is hereinafter referred to as in-range target power.

  On the other hand, when the remaining charge q (t) of the storage battery 20 is less than 200 kWh or greater than 300 kWh, the combined output target calculation unit 26 outputs the combined output target u (t) expressed by Equation 1. Such combined output target u (t) is hereinafter referred to as out-of-range target power.

  For example, in the example of FIG. 14, since the remaining charge q (t) of the storage battery 20 is included in the range of 200 to 300 kWh at times t1, t3, t5-t7, t10, t11, the combined output target calculation unit 26 outputs in-range target power at the time.

  On the other hand, at times t2, t4, t8, t9, and t12, the remaining charge q (t) of the storage battery 20 is less than 200 kWh or greater than 300 kWh. Output power.

  According to the second embodiment, when the remaining charge q (t) is included in the target remaining charge range, it is the same as setting the remaining charge adjustment value k (qtarget-q (t)) to 0. It is. That is, the control for maintaining the remaining charge q (t) of the storage battery 20 at the target remaining charge qtarget is not performed. Thereby, when the remaining charge q (t) is included in the target remaining charge range, the output power p (t) of the solar power generation device 10 can be preferentially smoothed.

(Modification of Embodiment 2)
At least one of the upper limit value and the lower limit value of the target remaining charge range described in the second embodiment may have hysteresis.

  For example, two threshold values of 290 kWh and 310 kWh are set for the upper limit value of the target remaining charge range 200 to 300 kWh. Moreover, two threshold values of 190 kWh and 210 kWh are set for the lower limit value of the target remaining charge range 200 to 300 kWh.

  When the combined output target calculation unit 26 outputs the target power within the range, the combined output target calculation unit 26 is within the range unless the remaining charge q (t) exceeds the threshold 310 kWh or falls below the threshold 190 kWh. Continue to output the target power. The combined output target calculation unit 26 outputs out-of-range target power when the remaining charge q (t) exceeds the threshold value 310 kWh or falls below the threshold value 190 kWh.

  On the other hand, when the combined output target calculation unit 26 outputs out-of-range target power, the combined output target calculation unit 26 sets the range when the remaining charge q (t) is 210 kWh or more and 290 kWh or less. The target power is output. When the remaining charge q (t) is less than 210 kWh or exceeds 290 kWh, the combined output target calculation unit 26 continues to output out-of-range target power.

  According to this modification, the upper limit value and the lower limit value of the target remaining charge range have hysteresis properties. For this reason, even when the remaining charge q (t) changes near the upper limit or the lower limit, the remaining charge q (t) of the storage battery 20 is maintained at the target remaining charge qtarget. It is possible to prevent frequent switching between execution and non-execution of control.

[Appendix]
Specifically, the power conditioner 21 (control device) includes a computer system including a microprocessor, a ROM (Read Only Memory), a RAM (Random Access Memory), an HDD (Hard Disk Drive), and the like. May be. A computer program is stored in the RAM or HDD. The control device achieves its functions by the microprocessor operating according to the computer program.

  Furthermore, some or all of the constituent elements constituting the control device may be configured by one system LSI.

  Further, the present invention may be the method described above. Further, the present invention may be a computer program that realizes these methods by a computer.

  Furthermore, the present invention may be a computer-readable non-transitory recording medium such as an HDD, a CD-ROM, or a semiconductor memory.

In the present invention, the computer program may be transmitted via an electric communication line, a wireless or wired communication line, a network represented by the Internet, a data broadcast, or the like.
Further, the control device may be realized by a plurality of computers.

Also, some or all of the functions of the control device may be provided by cloud computing. That is, part or all of the functions of the control device may be realized by the cloud server.
Furthermore, the above embodiment and the above modification examples may be combined.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Electric power system 10 Solar power generation device 11, 21 Power conditioner 20 Storage battery 21A Control device 22 Active power detector 23 Smoothing process part 24 Target charge remaining amount acquisition part 25 Charge remaining amount detector 26 Composite output target calculation part 26A, 26D 27A Subtractor 26B Multiplier 26C Proportional device 26E Composite output value command unit 27 Charge / discharge control unit 27B Charge / discharge command unit 28 AC-DC converter 30 Power system 40 Distribution line

Claims (7)

A storage battery control device for smoothing output fluctuations of a renewable energy power generation device that generates power using renewable energy by charging and discharging a storage battery that stores electric power generated by the renewable energy power generation device. ,
An output power acquisition unit for acquiring output power of the renewable energy power generation device;
A remaining charge acquisition unit for acquiring the remaining charge of the storage battery;
A charge remaining amount adjustment value obtained by amplifying a deviation between the remaining charge amount and a target remaining charge amount that is a target value of the remaining charge amount of the storage battery by a predetermined gain based on output power of the renewable energy power generation device; and the regeneration A combined output target calculation unit that calculates a combined output target that is a target value of combined output power of the renewable energy power generation device and the storage battery based on a power generation target that is a target value of output power of the renewable energy power generation device;
A control device comprising: a charge / discharge control unit that controls charge / discharge of the storage battery based on the combined output target. further,
A power generation target acquisition unit that acquires, as the power generation target, a value obtained by smoothing the output power of the renewable energy power generation apparatus acquired by the output power acquisition unit;
The combined output target calculation unit, based on the power generation target based on the remaining charge adjustment value obtained by amplifying the deviation between the remaining charge and the target remaining charge by the predetermined gain based on the power generation target, The control device according to claim 1, wherein a composite output target is calculated. The control device according to claim 2, wherein the predetermined gain is set to a value proportional to the power generation target. The combined output target calculation unit calculates the power generation target as the combined output target when the remaining charge amount is included in a target remaining charge range including the target remaining charge amount. Item 4. The control device according to any one of items 3. The control device according to claim 4, wherein at least one of an upper limit value and a lower limit value of the target remaining charge range has a hysteresis property. The storage battery control method for smoothing output fluctuations of a renewable energy power generation apparatus that generates power using renewable energy by charging and discharging a storage battery that stores electric power generated by the renewable energy power generation apparatus, ,
Obtaining output power of the renewable energy power generation device;
Obtaining the remaining charge of the storage battery;
A charge remaining amount adjustment value obtained by amplifying a deviation between the remaining charge amount and a target remaining charge amount that is a target value of the remaining charge amount of the storage battery by a predetermined gain based on output power of the renewable energy power generation device; and the regeneration Calculating a combined output target that is a target value of the combined output power of the renewable energy power generation device and the storage battery based on a power generation target that is a target value of output power of the renewable energy power generation device;
Controlling charging / discharging of the storage battery based on the combined output target. A computer program for smoothing output fluctuations of a renewable energy power generator that generates power using renewable energy by charging and discharging a storage battery that stores electric power generated by the renewable energy power generator,
Computer
An output power acquisition unit for acquiring output power of the renewable energy power generation device;
A remaining charge acquisition unit for acquiring the remaining charge of the storage battery;
A charge remaining amount adjustment value obtained by amplifying a deviation between the remaining charge amount and a target remaining charge amount that is a target value of the remaining charge amount of the storage battery by a predetermined gain based on output power of the renewable energy power generation device; and the regeneration A combined output target calculation unit that calculates a combined output target that is a target value of combined output power of the renewable energy power generation device and the storage battery based on a power generation target that is a target value of output power of the renewable energy power generation device;
The computer program for functioning as a charging / discharging control part which controls charging / discharging of the said storage battery based on the said synthetic | combination output target.