JP2014057412A - Output fluctuation suppression device for natural energy power generation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve output fluctuation suppression performance.SOLUTION: According to an embodiment, an output fluctuation suppression device for natural energy power generation devices which suppresses output fluctuation in power supplied to a power system from a natural energy power generation device for generating power by using natural energy comprises: a power storage device for storing power; a power converter for charging/discharging the power storage device, according to a power instruction; and a power instruction calculation device for calculating the power instruction for the power converter. The power instruction calculation device determines the power instruction for the power converter by combining a power instruction based on a power detection value acquired from a power detector for detecting power output from the natural energy power generation device and a power instruction based on a power prediction value acquired from a natural energy power generation power prediction device for predicting power output from the natural energy power generation device.

Description

  Embodiments described herein relate generally to an output fluctuation suppressing device for a natural energy power generation device.

  In recent years, natural energy power generation devices that use natural energy, such as wind power generation devices and solar power generation devices, have been linked to power systems. In general, since the output of a natural energy power generation apparatus is unstable, output fluctuation is suppressed.

  FIG. 7 is a configuration diagram illustrating an example of an output fluctuation suppressing device of a conventional natural energy power generation device.

  A power detector 103 and an output fluctuation suppressing device 104 are connected between the natural energy power generation device 101 and the power system 102. The output fluctuation suppression device 104 includes a power converter 105, a power storage device 106, and a power command calculation device 107.

  The power output from the natural energy power generation apparatus 101 is detected by the power detector 103, and the detected power value is input to the power command calculation apparatus 107. The power command calculation device 107 inputs the power detection value from the power detector 103 and the information on the storage amount of the power storage device 106 and calculates a power command (a value indicating the power to be charged or discharged by the power storage device 106). And output to the power converter 105. The power converter 105 charges and discharges the power storage device 106 according to the power command.

  FIG. 8 is a block diagram illustrating an example of a conventional power command calculation device.

  The power command calculation device calculates a power command as follows.

  If the power detected by the power detector (output of the natural energy power generation device) is u and the output after the smoothing filter is y, y is expressed as follows.

y = GF × u (1)
Here, GF represents a smoothing filter.

  The power command PwB (discharge is expressed as a positive value and charge is expressed as a negative value) is calculated as follows from the outputs before and after the smoothing filter and the feedback of the storage amount SOC.

PwB = y−u−kf × (SOC _REF −SOC) (2)
Here, SOC _REF represents a storage amount target value, and kf represents a feedback gain.

The storage amount SOC is expressed as follows.

      Here, V represents the voltage of the power storage device.

  The output z after fluctuation suppression when the feedback gain kf is 0 is expressed as follows.

z = u + GB × PwB = GB × y + (1−GB) × u (4)
Here, GB denotes a transfer function of the power storage device.

  Thereby, when the transfer function GB of the power storage device is 1, it can be seen that the output z after fluctuation suppression is the output y after the smoothing filter.

  In addition, the control apparatus which calculates the predicted value of natural energy generated electric power and calculates the electric power command of an electric power storage apparatus based on a predicted value is known.

  Furthermore, since a natural energy power generation device such as a solar power generation device does not generate power at night, a power storage device for load leveling that charges the amount of power generated during the day and discharges at night to level the load, and a natural energy power generation device There is also known a control device provided with a power storage device for fluctuation suppression that smoothes the output fluctuation.

Japanese Patent No. 4796974 Japanese Patent No. 3905692 Japanese Patent No. 4609156

  However, the conventional output fluctuation suppressing device has the following problems.

The closed-loop system of the storage amount SOC feedback is expressed as follows.

As a result, the transfer function of the power storage device when the feedback gain is not 0 is the following high-pass filter.

  Thereby, when there exists storage amount SOC feedback, it turns out that the suppression performance of the high frequency component of an output fluctuation falls.

  In addition, when the storage amount of the power storage device is not taken into consideration, the fluctuation suppressing performance decreases when the upper limit or lower limit of the storage amount is exceeded.

  In addition, some conventional control devices switch the charge / discharge current for suppressing fluctuations between the charging time zone and the discharging time zone of the load leveling operation, but a large power storage device is required for the load leveling operation. It becomes.

  The problem to be solved by the invention is to provide an output fluctuation suppressing device for a natural energy power generation apparatus capable of improving the output fluctuation suppressing performance.

  According to the embodiment, the power storage device that stores power in the output fluctuation suppression device of the natural energy power generation device that suppresses the output fluctuation of the power supplied from the natural energy power generation device that generates power using natural energy to the power system. And a power converter that charges and discharges the power storage device according to a power command, and a power command calculation device that calculates a power command to the power converter. The power command calculation device includes a power command based on a power detection value obtained from a power detector that detects power output from the natural energy power generation device, and natural energy that predicts power output from the natural energy power generation device. The power command to the power converter is determined by combining with the power command based on the predicted power value obtained from the generated power prediction device.

  According to the present invention, output fluctuation suppression performance can be improved.

The lineblock diagram showing an example of the output variation control device concerning a 1st embodiment. The block diagram which shows an example of the electric power command calculating apparatus which concerns on 1st Embodiment. Explanatory drawing which shows an example of the smoothing filter of the electric power command calculating apparatus which concerns on 1st Embodiment. The block diagram which shows an example of the electric power command calculating apparatus which concerns on 2nd Embodiment. The block diagram which shows an example of the output fluctuation suppression apparatus which concerns on 3rd Embodiment. The block diagram which shows an example of the electric power command calculating apparatus which concerns on 3rd Embodiment. The block diagram which shows an example of the conventional output fluctuation suppression apparatus. The block diagram which shows an example of the conventional electric power command calculating device.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
The first embodiment will be described with reference to FIGS. 1 to 3.

  FIG. 1 is a configuration diagram illustrating an example of an output fluctuation suppressing device according to the first embodiment. The configuration of FIG. 1 is also applied to a second embodiment described later.

  As shown in FIG. 1, a power detector 3 and an output fluctuation suppressing device 4 are connected between the natural energy power generation device 1 and the power system 2. The output fluctuation suppressing device 4 includes a power converter 5, a power storage device 6, and a power command calculation device 7. The power output from the natural energy power generation device 1 is detected by the power detector 3, and the detected power value is input to the power command calculation device 7.

  The natural energy power generation device 1 generates power using natural energy such as a wind power generation device or a solar power generation device.

  The power detector 3 detects power output from the natural energy power generation apparatus 1 to the power system 2.

  The output fluctuation suppressing device 4 suppresses output fluctuation of the electric power supplied from the natural energy power generation device 1 to the power system 2.

  The power converter 5 charges and discharges the power storage device 6 according to the power command from the power command calculation device 7.

  The power storage device 6 stores power under the control of the power converter 5.

  In particular, the power command calculation device 7 of the present embodiment is output from the power command based on the power detection value obtained from the power detector 3 that detects the power output from the natural energy power generation device 1 and from the natural energy power generation device 1. The power command to the power converter 5 (indicating the power to be charged or discharged by the power storage device 6) by combining with the power command based on the predicted power value obtained from the natural energy generated power prediction device 8 that predicts the power Value).

  Further, the power command calculation device 7 of the present embodiment has a function of changing the combination ratio according to the power detection value obtained from the power detector 3 and the power prediction value obtained from the natural energy generated power prediction device 8. It has.

  Further, the power command calculation device 7 of the present embodiment uses the maximum value and the minimum value of the sum of the power command value to the power converter 5 and the power detection value obtained from the power detector 3 in a past fixed period. Thus, a function of adjusting a power command to the power converter 5 is provided.

  In such a configuration, the natural energy generated power predicting device 8 predicts the power of the natural energy generating device 1 from, for example, weather information (weather information, wind information) of a weather forecasting organization. The power detector 3 detects the power of the natural energy power generation apparatus 1. The power command calculation device 7 inputs the power detection value obtained from the power detector 3 and the power prediction value obtained from the natural energy generated power prediction device 8, and also stores the storage amount of the power storage device 6 as necessary. The information shown is input, and a power command is output to the power converter 5. The power converter 5 converts the charge / discharge power of the power storage device 6 based on the power command from the power command calculation device 7.

  FIG. 2 is a block diagram illustrating an example of the power command calculation device according to the first embodiment.

  Hereinafter, the power command calculation content by the power command calculation device 7 will be specifically described with reference to FIG.

  Assuming that the power detected by the power detector 3 (output of the natural energy generator) is u, the output after the smoothing filter is y, and the average output in the predicted time zone (for example, 30 minutes) is uav, y and uav are respectively It is expressed as follows.

y = GF × u (7)
uav = Gav × u (8)
Here, GF represents a smoothing filter, and Gav represents a time average.

  If the power predicted by the natural energy generated power prediction device 8 (average predicted value in the predicted time zone) is r, the combined ratio w is expressed as follows, for example.

w = kp × | r-uav | (9)
Here, kp represents a coefficient.

  That is, when the absolute value of the difference between r and uav is relatively large (when the accuracy of the natural energy generated power prediction device is poor), w is large, while the absolute value of the difference between r and uav is relatively small. In the case (when the accuracy of the natural energy generated power prediction device is good), w becomes small.

The combined power command x is expressed as follows.

      Here, Gdz indicates a dead zone (power generation prediction difference).

  That is, when w is relatively large, the weight for y is larger than r, while when w is relatively small, the weight for r is larger than y.

  The power command PwB to the power storage device 6 is expressed as follows.

PwB = x (11)
The output z after suppression of fluctuations in the power storage device 6 is expressed as follows.

      Here, GB1 indicates a transfer function of the power storage device 6.

  Thereby, when the transfer function GB of the power storage device 6 is 1 and the width of the dead zone Gdz is 0, the output z after fluctuation suppression is a combination of the output r of the natural energy generated power prediction device 8 and the output y after the smoothing filter. It turns out that it becomes an output.

  In addition, when the accuracy of the natural energy generated power prediction device 8 is poor (the difference between the average predicted value and the average output of the predicted time zone is large), the composite ratio w is increased, and the power command PwB is used to predict the natural energy generated power prediction. It can be seen that the term of the output r of the device becomes small.

  According to the first embodiment, the power command calculated from the power detection value obtained from the power detector 3 and the power command calculated from the power prediction value obtained from the natural energy generated power prediction device 8 are combined, Since the command for charging / discharging the storage device 6 is calculated, when the power prediction accuracy is high, the output fluctuation suppression performance can be improved, and even when the power prediction accuracy is reduced, the output fluctuation suppression performance is hardly reduced. Can do.

  Note that the smoothing filter GF includes, for example, a time average and a primary filter, but adjustment of the parameters of the smoothing filter is necessary in order to keep the output fluctuation range within a predetermined value.

  For example, as shown in FIG. 3, the maximum value zmax and the minimum value zmax of the output z after suppression of fluctuation in a past fixed period, as shown in FIG. The value zmin is obtained, and the output y of the smoothing filter is calculated as follows from the obtained zmax and zmin.

y = Max [Min [u, zmin + zwidth], zmax−zwidth]
... (13)
Here, zwidth indicates a target width of output fluctuation.

  As a result, the smoothing filter GF uses the maximum value and the minimum value of the sum of the power command value to the power converter and the power detection value obtained from the power detector in the past fixed period. It is possible to make it difficult to reduce the output fluctuation suppression performance due to the parameters.

  Further, when the smoothing filter GF is a primary filter, there is a time constant as a parameter, but it is known that the storage amount width of the power storage device has a positive correlation with this time constant.

  As a result, by calculating the parameters of the smoothing filter GF using the predicted power value obtained from the natural energy generated power prediction device and the detected power value obtained from the power detector (for example, a negative function of the composite ratio w) Even when the prediction accuracy is reduced, it is possible to make it difficult to reduce the output fluctuation suppression performance due to exceeding the upper limit or lower limit of the storage amount of the power storage device.

  Furthermore, as a parameter of the dead zone Gdz, there is a width of the power generation prediction difference, but the output width of the power storage device has a negative correlation with the width of the power generation prediction difference.

  Thereby, the parameter of the dead zone Gdz is calculated (for example, a positive function of the composite ratio w) by calculating the power prediction value obtained from the natural energy generated power prediction device and the power detection value obtained from the power detector. Even when the output voltage decreases, it is possible to make it difficult to reduce the output fluctuation suppression performance by exceeding the upper limit or lower limit of the output of the power storage device.

(Second Embodiment)
The second embodiment will be described with reference to FIG. 4 while referring to FIG. 1 again.

  Below, description of the part which is common in 1st Embodiment is abbreviate | omitted, and it demonstrates centering on a different part.

  The configuration of FIG. 1 is also applied to a second embodiment described later.

  In the output fluctuation suppressing device 4 according to the second embodiment, the power command calculation device 7 adds the function described in the first embodiment, the result of the synthesis described above, the storage amount and the storage amount of the power storage device 6. A function of determining a power command to the power converter 5 based on an operation amount corresponding to a deviation from the target value is further provided.

  In addition, the power command calculation device 7 of the present embodiment is based on the detected power value obtained from the power detector 3 and the predicted power value obtained from the natural energy generated power prediction device 8. The function of determining (or adjusting) is further provided. This function may be provided in a place other than the power command calculation device 7.

  In such a configuration, the natural energy generated power predicting device 8 predicts the power of the natural energy generating device 1 from, for example, weather information (weather information, wind information) of a weather forecasting organization. The power detector 3 detects the power of the natural energy power generation apparatus 1. The power command calculation device 7 inputs the power detection value obtained from the power detector 3, the power prediction value obtained from the natural energy generated power prediction device 8, and information indicating the storage amount of the power storage device 6. A power command is output to the converter 5. The power converter 5 converts the charge / discharge power of the power storage device 6 based on the power command from the power command calculation device 7.

  FIG. 4 is a block diagram illustrating an example of a power command calculation device according to the second embodiment.

  Hereinafter, the power command calculation contents by the power command calculation device 7 will be described in detail with reference to FIG. Note that description of portions common to FIG. 2 is omitted.

  The above-described formulas (7) to (10) and related explanations also apply to this embodiment.

  The power command PwB1 to the power storage device 6 (discharge is expressed as a positive value and charge is expressed as a negative value) is expressed as follows, for example.

PwB1 = x−kf × w × (SOC1 _REF− SOC1) (14)
Here, SOC _REF indicates a storage amount target value of the power storage device 6, and kf indicates a feedback gain.

The output z after suppression of fluctuations in the power storage device 6 is expressed as follows.

      Here, GB1 indicates a transfer function of the power storage device 6.

  Thereby, when the transfer function GB1 of the power storage device 6 is 1, the width of the dead band Gdz is 0, and the feedback gain kf is 0, the output z after fluctuation suppression is the output r of the natural energy generated power prediction device 8 and the smoothing filter It turns out that it becomes a synthetic | combination output of the later output y.

  When the storage amount feedback amount is increased, there is a slight decrease in output fluctuation suppression performance within the upper limit or lower limit of the storage amount of the power storage device 6, but the output due to exceeding the upper limit or lower limit of the storage amount of the power storage device 6 A significant decrease in the fluctuation suppressing performance is eliminated, and the required storage amount of the power storage device 6 can be reduced.

  According to the second embodiment, the detected power value obtained from the power detector 3, the predicted power value obtained from the natural energy generated power prediction device 8, the storage amount target value obtained from the storage amount target calculation function, and the power storage Since the command for charging / discharging the power storage device 6 is calculated based on the storage amount obtained from the device 6, when the power prediction accuracy is high, the output fluctuation suppression performance can be improved, and even when the power prediction accuracy is reduced, The output fluctuation suppressing performance can be made difficult to decrease, and the required storage amount of the power storage device 6 can be reduced.

  Further, the required storage amount of the power storage device 6 varies depending on the storage amount target value. For this reason, the power prediction accuracy is reduced by calculating the storage amount target value from the predicted power value obtained from the natural energy generation power prediction device and the detected power value obtained from the power detector using the function of the composite ratio. Even in this case, the required storage amount of the power storage device can be reduced.

(Third embodiment)
A third embodiment will be described with reference to FIGS. 5 and 6.

  Below, description of the part which is common in 1st Embodiment is abbreviate | omitted, and it demonstrates centering on a different part.

  As shown in FIG. 5, the output fluctuation suppressing device 4 according to the third embodiment is provided with two power storage devices 6A and 6B for storing electric power, and in accordance with this, two power conversion devices are provided. Containers 5A and 5B are provided.

  The power storage device 6A has a relatively small power storage capacity, and the power storage device 6B has a relatively large power storage capacity.

  The power converter 5 </ b> A charges and discharges the power storage device 6 </ b> A according to the power command from the power command calculation device 7.

  The power converter 5 </ b> B charges and discharges the power storage device 6 </ b> B in accordance with the power command from the power command calculation device 7.

  The power command calculation device 7 calculates a power command to the power converter 5A and a power command to the power converter 5B.

  In particular, the power command calculation device 7 of the present embodiment includes a power detection value obtained from the power detector 3 that detects power output from the natural energy power generation device 1, a storage amount and a storage amount target value of the power storage device 6A. The power command to the power converter 5A is determined based on the operation amount corresponding to the deviation, and the power command to the power converter 5B is determined based on the operation amount.

  Moreover, the power command calculation device 7 of the present embodiment further includes a storage amount target value setting function for changing the storage amount target value of the power storage device 6B according to the time zone of the day. This function may be provided in a place other than the power command calculation device 7.

  In addition, the power command calculation device 7 of the present embodiment is based on a storage amount target value receiving function that receives information indicating the storage amount target value of the power storage device 6B and information received by the storage amount target value receiving function. The storage amount target value setting function for setting the storage amount target value of the power storage device 6B may be provided. Further, this function may be provided at a place other than the power command calculation device 7.

  In addition, in the configuration of FIG. 5, a configuration in which the power command calculation device 7 obtains a predicted power value from the natural energy generated power prediction device 8 illustrated in FIG. 1 may be added. In this case, the power command calculation device 7 of the present embodiment uses the power command based on the power detection value obtained from the power detector 3 that detects the power output from the natural energy power generation device 1 and the natural energy shown in FIG. You may further provide the function to synthesize | combine with the electric power command based on the electric power predicted value obtained from the generated electric power prediction apparatus 8. FIG.

  In such a configuration, the power detector 3 detects the power of the natural energy power generation apparatus 1. The power command calculation device 7 inputs the power detection value obtained from the power detector 3, inputs information indicating the storage amount of each of the power storage devices 6A and 6B, and outputs the power command to the power converters 5A and 5B. To do. The power converter 5 </ b> A converts charge / discharge power of the power storage device 6 </ b> A based on the power command from the power command calculation device 7. The power converter 5 </ b> B converts the charge / discharge power of the power storage device 6 </ b> B based on the power command from the power command calculation device 7.

  FIG. 6 is a block diagram illustrating an example of a power command calculation device according to the third embodiment.

  Hereinafter, the power command calculation contents by the power command calculation device 7 will be specifically described with reference to FIG.

  If the output of the natural energy power generation device 1 is u and the output after the smoothing filter is y1, y1 is expressed as follows.

y1 = GF × u (16)
Here, GF represents a smoothing filter.

  The power command PwB1 to the power storage device 6A is expressed as follows.

PwB1 = y1-u-kf1 × (SOC1 REF -SOC1) ... (17)
Here, SOC1 _REF represents a storage amount target value of the power storage device 6A, and kf1 represents a feedback gain.

  The output z1 after suppression of fluctuations in the power storage device 6A is expressed as follows.

z1 = u + GB1 × PwB1
= Gb1 * GF * u + (1-GB1) * u
_{-GB1 × kf1 × (SOC1 REF -SOC1} ) ... (18)
Here, GB1 represents a transfer function of the power storage device 6A.

  The power command PwB2 to the power storage device 6B (representing discharge as a positive value and charging as a negative value) is expressed as follows.

PwB2 = kf1 × (SOC1 _REF− SOC1) (19)
The output z2 after fluctuation suppression in the power storage device 6B is expressed as follows.

z2 = z1 + GB2 × PwB2
= GB1 * y1 + (1-GB1) * u
+ (GB2-GB1) * kf1 * (SOC1 _REF- SOC1) (20)
Here, GB2 represents a transfer function of the power storage device 6B.

  Thereby, when the transfer functions GB1 and GB2 of the power storage devices 6A and 6B are 1, it can be seen that the output z2 after the fluctuation suppression is the output y1 after the smoothing filter.

  When the feedback gain kf1 is increased, the required storage amount of the power storage device 6A can be reduced regardless of the fluctuation suppression performance. In this case, the required storage amount of the power storage device 6B is large, but the output of the storage amount feedback is smaller than the output necessary for smoothing natural energy, so the required output of the power storage device 6B is small.

  According to the third embodiment, since the storage amount of one power storage device 6A is controlled to the storage amount target value and a command for charging / discharging the power to the other power storage device 6B is calculated, output fluctuation suppression The performance can be made difficult to decrease, the required storage amount of the power storage device 6A can be reduced, and the required output of the power storage device 6B can be reduced.

  The power command PwB2 to the power storage device 6B may be as follows.

PwB2 = kf1 × (SOC1 _REF −SOC1)
−kf2 × (SOC2 _REF −SOC2) (21)
Here, SOC2 _REF indicates a storage amount target value of the power storage device 6B, and kf2 indicates a feedback gain.

Moreover, a rather storage amount target value of the electric power storage device 6B is constant, for example, by the following equation, and the storage amount target value _{SOC2 REFnight} at night, the storage amount target value _{SOC2 REFday} at daytime, time of day By using this information, the power storage device 6B can be used effectively to perform power leveling for one day (day and night).

      Here, t1 represents morning and t2 represents evening.

  Further, the storage amount target value of the power storage device 6B is not a value calculated by the storage amount target calculation device, but may be a value received by the above-described storage amount target value reception value function from, for example, a higher level of the power system 2. .

  As described above in detail, according to each embodiment, the output fluctuation suppressing performance can be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Natural energy power generation device, 2 ... Power system, 3 ... Power detector, 4 ... Output fluctuation suppression device, 5, 5A, 5B ... Power converter, 6, 6A, 6B ... Power storage device, 7 ... Power command calculation Apparatus, 8 ... Natural energy generated power prediction apparatus.

Claims (9)

An output fluctuation suppression device for a natural energy power generation apparatus that suppresses output fluctuation of power supplied to a power system from a natural energy power generation apparatus that generates power using natural energy,
A power storage device for storing power;
A power converter that charges and discharges the power storage device according to a power command;
A power command calculation device for calculating a power command to the power converter;
With
The power command calculation device includes a power command based on a power detection value obtained from a power detector that detects power output from the natural energy power generation device, and natural energy that predicts power output from the natural energy power generation device. An output fluctuation suppression device for a natural energy power generation device, wherein a power command to the power converter is determined by combining with a power command based on a predicted power value obtained from a generated power prediction device.   The power command calculation device changes the combination ratio according to a power detection value obtained from the power detector and a power prediction value obtained from the natural energy generated power prediction device. The output fluctuation suppression device of the natural energy power generation device according to 1.   The power command calculation device uses the maximum value and the minimum value of the sum of a power command value to the power converter and a power detection value obtained from the power detector in a certain past period, and uses the power converter The output fluctuation suppression device for a natural energy power generation device according to claim 1, wherein a power command to the power source is adjusted. The power command calculation device determines a power command to the power converter based on a result of the combination and an operation amount corresponding to a deviation between a storage amount of the power storage device and a storage amount target value. The output fluctuation suppression apparatus of the natural energy power generation apparatus of any one of Claims 1 thru | or 3 characterized by these.   The apparatus further comprises means for determining a storage amount target value of the power storage device based on a power detection value obtained from the power detector and a power prediction value obtained from the natural energy generated power prediction device. The output fluctuation suppression device of the natural energy power generation device according to claim 4. An output fluctuation suppression device for a natural energy power generation apparatus that suppresses output fluctuation of power supplied to a power system from a natural energy power generation apparatus that generates power using natural energy,
A first power storage device and a second power storage device for storing power respectively;
A first power converter that charges and discharges the first power storage device in response to a power command;
A second power converter that charges and discharges the second power storage device in response to a power command;
A power command calculation device for calculating a power command to the first power converter and a power command to the second power converter;
With
The power command calculation device is configured to detect a deviation between a power detection value obtained from a power detector that detects power output from the natural energy power generation device, and a storage amount and a storage amount target value of the first power storage device. A power command to the first power converter is determined based on a corresponding operation amount, and a power command to the second power converter is determined based on the operation amount. The output fluctuation suppression device of the natural energy power generator.   The output of the natural energy power generator according to claim 6, further comprising storage amount target value setting means for changing a storage amount target value of the second power storage device in accordance with a time zone of a day. Fluctuation suppression device. A storage amount target value receiving means for receiving information indicating a storage amount target value of the power storage device;
A storage amount target value setting means for setting a storage amount target value of the second power storage device based on information received by the storage amount target value receiving means;
The output fluctuation suppressing device for a natural energy power generator according to claim 6, further comprising:   The power command calculation device includes a power command based on a power detection value obtained from a power detector that detects power output from the natural energy power generation device, and natural energy that predicts power output from the natural energy power generation device. The output fluctuation suppression device for a natural energy power generation device according to any one of claims 6 to 8, wherein the output command is combined with a power command based on a predicted power value obtained from the generated power prediction device.

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