JP6573546B2 - Electric power fluctuation control device for renewable energy power generator - Google Patents

Description

  The present invention relates to a power fluctuation control device and a power fluctuation control method for a renewable energy power generator.

  In recent years, introduction of power generation devices using renewable energy (natural energy) such as a solar power generation system has been promoted due to environmental problems and the like. However, since renewable energy such as sunlight and wind power largely varies depending on the weather, there is a possibility of causing voltage variation and frequency variation for the power system connected to the renewable energy power generation device.

  As a countermeasure, a renewable energy power generator is provided with a storage battery system for suppressing fluctuations, and the output of the power system is smoothed by appropriately charging and discharging the storage battery system according to the output change of the renewable energy power generator. A method has been proposed.

  Patent Document 1 discloses a technique related to an operation method of a storage battery system. In patent document 1, in order to control the fluctuation | variation of the output electric power of a wind power generator group to the predetermined output possible range, control instruction | command is made to compensate by charging / discharging of an electrical storage system. Moreover, in patent document 1, based on the weather information measured with the weather observation apparatus, the fluctuation | variation of the near future output electric power of a wind power generator group is estimated, and whether the predicted output electric power deviates from the output possible range. If it departs from the possible output range, at least one of the target value of the charge rate of the power storage system and the limit value of the charge / discharge power of the power storage system is commanded as a control command for the power storage system.

JP 2013-219941 A

  In the conventional technology, when the power generation output of the renewable energy power generator is surplus, the storage battery is charged, and conversely, when the power generation output is insufficient, the storage battery is discharged to cause voltage fluctuation or frequency fluctuation in the connected power system. Suppresses the occurrence. Therefore, the sum of the power generation output of the renewable energy power generation apparatus and the charge / discharge output from the storage battery is the output of the entire system.

  However, for example, if it suddenly becomes cloudy or the wind stops and the state continues for a long time, the power generation output of the renewable energy power generation device decreases for a long time. In this case, in order to keep the fluctuation of the system output within the allowable range, it is necessary to prepare a large-capacity storage battery. This is because if the capacity of the storage battery is insufficient, the fluctuation amount of the system output exceeds the allowable range of the power system, which may affect stable power supply and quality maintenance. However, as the storage battery becomes larger, the introduction cost increases and a larger installation area is required.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a renewable energy that can reduce the required capacity of the power storage device even when the power generation output of the renewable energy power generation device fluctuates. An object of the present invention is to provide a power fluctuation control device and a power fluctuation control method for a power generator.

  In order to solve the above problems, a power fluctuation control device for a renewable energy power generation device according to the present invention is a power fluctuation control device that suppresses fluctuations in power generation output of a renewable energy power generation device that generates power using renewable energy. When the deviation degree between the first output target value obtained by smoothing the power generation output monitor value and the power generation output monitor value is detected and the deviation degree satisfies a predetermined correction start condition, the deviation degree In order to reduce the difference between the output target value correction unit that corrects the first output target value to the second output target value and the second output target value and the monitor value of the power generation output, A charge / discharge target value control unit for controlling a charge / discharge output of the power storage device.

  According to the present invention, the first output target value is the second output target so that the deviation degree decreases when the deviation degree between the first output target value and the monitor value of the power generation output satisfies a predetermined correction start condition. Corrected to value. For this reason, the charge / discharge target value control unit can appropriately control the charge / discharge output of the storage battery.

1 is an overall view of a renewable energy power generation system. The block diagram of a general controller. The block diagram which shows the detail of a system target output calculating part. The block diagram which shows the detail of an output correction | amendment part. The example of the table which controls the switch in an output correction | amendment part. The graph which shows the difference of SOC by the time change of a power generation output monitor signal and a system target output, and the case where a system target value is correct | amended. Explanatory drawing which shows the example of the correction method of a system target output. The conceptual diagram of the variable limiter which can be used in order to correct a system target output. The flowchart which shows the process which corrects a system target output. The block diagram of the general controller which concerns on 2nd Example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The power fluctuation control device 3 of the renewable energy power generation device according to the present embodiment will be described. In the present embodiment, a solar power generation device will be described as an example of a renewable energy power generation device, but the present invention is not limited to this and can be applied to a wind power generation device or the like.

  The power generation system 1 of the present embodiment includes a power control device 3 as a “power fluctuation control device” that suppresses fluctuations in the system output Psys, which is the sum of the power generation output Ppv of the power generation device and the charge / discharge output Pbatt of the storage battery 7. .

  The power control device 3 includes a smoothing unit 911 (see FIG. 2) that smoothes the power generation monitor signal of the power generation device. The power control device 3 has a target value correction function for correcting a deviation between the power generation output Ppv and the system output Psys. When the power generation output Ppv decreases, the target value correcting function decreases the system output Psys following the decrease.

  According to the present embodiment, the system output Psys can be modified to follow the change in the power generation output Ppv of the power generation apparatus, so that the difference between the system output Psys and the power generation output Ppv can be reduced. Since the divergence can be reduced, the amount of power discharged from the storage battery 7 in order to fill the divergence can be reduced. As a result, the reliability of the power generation system 1 can be maintained even if the capacity of the storage battery 7 is reduced. By reducing the size of the storage battery 7, the cost of the storage battery 7 can be reduced.

  A first embodiment will be described with reference to FIGS. FIG. 1 shows a schematic overall configuration diagram of a photovoltaic power generation system 1. The solar power generation system 1 includes, for example, a solar panel 4, a solar power conditioner (PCS) 5 (hereinafter referred to as a solar PCS 5), and a storage battery system 2. Hereinafter, the solar panel 4 and the solar PCS 5 are collectively referred to as a solar power generation device or a power generation device.

  The storage battery system 2 compensates the power generation output Ppv of the solar power generation device by the charge / discharge Pbatt of the storage battery 7. The storage battery system 2 includes, for example, a storage battery 7, a storage battery power conditioner 6 (hereinafter referred to as storage battery PCS 6), and a power control device 3.

  The power control device 3 includes, for example, a general controller 9. The power control device 3 further includes an external controller 10 that can communicate with the overall controller 9 via a communication network 8 such as the Internet, and a terminal 11 that is connected to the external controller 10 by a serial bus or a parallel bus. Also good. The detailed configuration of the overall controller 9 will be described later with reference to FIGS.

  By connecting the storage battery system 2 to an existing or newly installed solar power generation apparatus (solar panel 4 and solar PCS 5), the solar power generation system 1 of the present embodiment can be easily configured.

  Moreover, the solar power generation system 1 of this embodiment can be easily configured by connecting the power control device 3 to the existing solar panel 4, storage battery 7, solar PCS5, and storage battery PCS6. it can. The solar PCS 5 and the storage battery PCS 6 are connected at a connection point CP, and the connection point CP is connected to the power system 12.

  The power control device 3 can also correspond to a plurality of solar power generation devices. That is, by connecting one power control device 3 to a plurality of solar power generation devices, the difference between the power generation output Ppv of each solar power generation device and the system output Psys can be reduced.

  The solar panel 4 generates power using sunlight. The generated power Ppv of the solar panel 4 is converted from direct current to alternating current by the solar PCS 5 and supplied to the power system 12. Here, the solar panel 4 is made of, for example, a silicon type such as a single crystal silicon type, a polycrystalline silicon type, a microcrystalline silicon type, an amorphous silicon type, or a compound such as InGaAs, GaAs type, CIS type (calcobarite type), etc. It can be configured by connecting a plurality of solar cells in series and parallel. An organic solar panel 4 using a dye-sensitized solar cell or an organic thin-film solar cell may be used.

  On the other hand, the storage battery 7 charges and discharges charging / discharging power Pbatt to the power system 12 via the storage battery PCS 6. The storage battery 7 includes, for example, a lead storage battery, a lithium ion storage battery, a nickel / hydrogen storage battery, and the like.

  The system output Psys of the entire power generation system 1 for the power system 12 is a combined output of the power generation output Ppv and the charge / discharge power Pbatt, which is the power generated by the solar power generation device. The fluctuation of the power generation output Ppv due to the shade fluctuation component such as a cloud is canceled (compensated) by the charge / discharge power Pbatt, and the system output Psys is smoothed. That is, the storage battery system 2 has a fluctuation suppressing function that suppresses fluctuations in the power generation output Ppv.

  PCS 5 and 6 may be referred to as grid interconnection inverters. The power generation output Ppv of the solar panel 4 is output through the sunlight PCS 5. For this reason, the value of the power generation output Ppv is limited by the capacity of the solar PCS 5.

  As will be described in detail later, the overall controller 9 constituting the power control device 3 calculates a system target output Psys * that serves as a guide for fluctuation suppression, and calculates a charge / discharge target value Pb * based on the obtained system target output Psys *. Ask. Then, the overall controller 9 outputs the charge / discharge target value Pb * to the storage battery PCS 6.

  The general controller 9 can acquire the power generation output monitor signal Ppv_fb from the solar PCS 5 and the SOC (State Of Charge) from the storage battery 7 respectively, either periodically or irregularly. The power generation output monitor signal Ppv_fb is a monitor signal of the power generation output Ppv, and is measured by the sunlight PCS 5. It is good also as a structure which measures the electric power generation output monitor signal Ppv_fb with the wattmeter etc. which are separately installed in PCS5 for solar power generation.

  Although FIG. 1 shows a case where the PCS 5 for sunlight and the PCS 6 for storage battery are each installed alone, the present invention is not limited to this. For example, in a large-scale photovoltaic power generation system 1 such as a mega solar equipped with a large number of solar panels 4, a plurality of solar PCSs 5 are installed according to the plurality of solar panels 4, and a plurality of storage batteries 7 are supported. A plurality of storage battery PCSs 6 may be installed. In this case, the overall controller 9 calculates the system target output Psys * as the total value of the plurality of solar PCSs 5. Similarly, the overall controller 9 calculates the charge / discharge target value Pb * as the total value of the plurality of power storage PCSs 6.

  The power control device 3 can also be controlled via an external controller 10 installed at a location away from the power generation system 1. The operator can operate the terminal 11 to access the overall controller 9 via the external controller 10 and input setting values and the like. The operator can also display the state of the power generation system 1 on the terminal 11.

  FIG. 2 is a functional block diagram of the overall controller 9. The overall controller 9 calculates the charge / discharge target value Pb * based on the power generation output monitor signal Ppv_fb input from the solar PCS 5 as will be described later.

  The overall controller 9 includes, for example, a system target output calculation unit 91 and an output correction unit 92. The system target output calculation unit 91 calculates the system target output Psys * based on the power generation output monitor signal Ppv_fb input from the sunlight PCS 5. The system target output Psys * is a target value of the generated power output from the power generation system 1.

  The system target output calculation unit 91 obtains a system target output Psys * by performing a low-pass filter calculation such as a moving average method and a first-order delay as a smoothing calculation. The overall controller 9 calculates the charge / discharge target value Pb ** from the difference between the system target output Psys * and the power generation output monitor signal Ppv_fb. The charge / discharge target value Pb ** is corrected by the output correction unit 92. The output correction unit 92 corrects the input charge / discharge target value Pb ** and outputs a target value Pb * for adjusting the SOC of the storage battery 7. The output correction unit 92 may be called an SOC adjustment unit 92. The output correction unit 92 gives the corrected charge / discharge target value Pb * to the storage battery PCS6.

  FIG. 3 is a functional block diagram of the system target output calculation unit 91. The system target output calculation unit 91 includes, for example, a smoothing unit 911 and a target value correction unit 912.

  The smoothing unit 911 calculates the system target output Psys ** by performing a low-pass filter operation such as a moving average on the power generation output monitor signal Ppv_fb. The system target output Psys ** before correction corresponds to the “first output target value”.

  The target value correcting unit 912 corrects and outputs the system target output Psys **. The target value correction unit 912 includes, for example, an output change calculation unit 9121, a constraint condition storage unit 9122, and a correction amount calculation unit 9123.

  The output change calculation unit 9121 calculates the degree of divergence between the system target output Psys ** and the power generation output monitor signal Ppv_fb. The constraint condition storage unit 9122 stores conditions that the system output should observe. As a constraint condition, for example, there is a change rate per unit time. Here, it is assumed that the power generation system 1 must supply power to the power system 12 within the range of the change rate negotiated with the power transmission and distribution company.

  The correction amount calculation unit 9123 corrects the system target output Psys ** within a range that satisfies the constraint condition when the degree of deviation between the system target output Psys ** and the power generation output monitor signal Ppv_fb exceeds a predetermined value. The corrected system target output Psys * corresponds to the “second output target value”.

  Note that the function of the target value correcting unit 912 can be provided in the output correcting unit 92. That is, the output correction unit 92 virtually calculates the corrected system target output Psys * and calculates the charge / discharge target value Pb * so as to fill the difference between the system target output Psys * and the power generation output monitor signal Ppv_fb. You can also

  FIG. 4 shows details of the output correction unit 92. The output correction unit 92 includes, for example, an SOC determination unit 921, a deviation determination unit 922, a switching unit 923, a changeover switch 924, an SOC increase output calculation unit 925, and an SOC decrease output calculation unit 926.

  The SOC determination unit 921 increases or decreases the system output based on the SOC condition. The deviation determination unit 922 increases or decreases the system output based on the magnitude relationship between the corrected charge / discharge target value Pb * and the predetermined value ΔP. Switching unit 923 switches changeover switch 924 based on the determination result of SOC determination unit 921 and the determination result of deviation determination unit 922. The SOC increase output calculation unit 925 calculates an output for increasing the SOC. The SOC decrease output calculation unit 926 calculates an output for decreasing the SOC.

  FIG. 5 is a table T <b> 10 showing conditions for controlling the operation of the changeover switch 924. The output correction unit 92 inputs the determination results of the SOC determination unit 921 and the deviation determination unit 922 to the switching unit 923, and changes the switch state of the changeover switch 924 to states 1, 2, and based on the table T10 shown in FIG. Select from 3. Thereby, the output correction | amendment part 92 can determine whether charging / discharging target value Pb * is correct | amended.

  Here, the SOC determination unit 921 makes a determination based on the SOC, and the deviation determination unit 922 determines the charge / discharge target value Pb * one step before as an input. When the switch state 1 is selected, the output via the SOC increase output calculation unit 925 is output as the corrected charge / discharge target value Pb **. When the switch state 2 is selected, the output via the SOC decrease output calculation unit 926 is output as the corrected charge / discharge target value Pb **. When the switch state 3 is selected, the charge / discharge target value Pb * is output as it is.

  As shown in the lower side of the table T10 in FIG. 5, when the deviation is smaller than the predetermined value ΔP (Pb * <ΔP), the switch state is determined only by the determination result of the SOC determination unit 921 regardless of the switch state one step before. Is determined.

  That is, when SOC <UL, switch state 1 is selected to increase the SOC. If SOC> HL, switch state 2 is selected to decrease the SOC. When the SOC is located between the lower limit UL and the upper limit HL (UL <SOC <HL), the switch 3 state is selected to maintain the current state.

  As shown in the upper side of the table T10, when the deviation is larger than the predetermined value ΔP (Pb * ≧ ΔP), it is affected by the switch state one step before. If the switch state one step before is state 1 or state 3 and SOC <HL, Pb *> ΔP is prioritized, so switch state 1 is selected, and an output that raises the SOC is calculated. If SOC> HL, switch state 3 is selected to stop the correction. If one step before is switch state 2, switch state 3 is selected to stop the correction and prevent further reduction of the SOC. Thus, in this embodiment, the SOC reduction output (discharge from the storage battery 7) may be interrupted depending on the determination results of the SOC determination unit 921 and the deviation determination unit 922.

  FIG. 6 shows the relationship among the system target output Psys **, the power generation output monitor signal Ppv_fb, and the corrected system target output Psys * (Plim_d, Plim_u).

  For example, when the generated power Ppv decreases rapidly at time T1 and the state does not recover for a while, it is necessary to discharge from the storage battery 7 in order to satisfy the allowable range of output fluctuation. However, if the battery 7 is continuously discharged, an excessive discharge state occurs, and the amount of stored electricity (charge amount, SOC) becomes insufficient. If the amount of power stored in the storage battery 7 is insufficient, the system output of the power generation system 1 cannot satisfy the allowable range of output fluctuation required by the power system 12, so that the power quality of the power system 12 (voltage and frequency are within a certain range). There is a risk of lowering. Furthermore, if the function of suppressing fluctuations in the system output of the power generation system 1 is reduced, the contract with the power transmission / distribution company or the like may be violated, which may cause disadvantages such as a reduction in the power purchase price.

  Therefore, in this embodiment, the system target output Psys * is corrected so that the amount of discharge from the storage battery 7 can be reduced as much as possible and the amount of stored electricity can be maintained. Thereby, in a present Example, it is prevented beforehand that the storage battery 7 will be in an overdischarge state, and generation | occurrence | production of the situation which deviates from the tolerance | permissible_range of an output fluctuation is suppressed.

  For this reason, in this embodiment, a threshold value of the difference Pb ** between the system target output Psys * and the power generation output monitor signal Ppv_fb is set, and when the threshold value is exceeded, the system target output Psys * is output as a discharge amount reduction lowering output. It is corrected (corrected) to Plim_d.

  As a condition for starting the correction of the system target output Psys *, for example, when the difference Pb ** between the system target output Psys * and the power generation output monitor signal Ppv_fb exceeds a threshold value, the differential value of the power generation output monitor signal Ppv_fb is a predetermined amount or more. It may decrease.

  After the system target output Psys * is corrected to the discharge amount reduced output Plim_d, when the discharge amount reduced output Plim_d and the power generation output monitor signal Ppv_fb intersect at time Ts, the system target output is corrected again.

  That is, the system target output Psys * is switched to the discharge amount reduction increase output Plim_u having an inclination of a2 = −a1 at the intersection time Ts. Finally, at time T2 when the discharge amount reduction increase output Plim_u and the system target output Psys * intersect, the discharge amount reduction increase output Plim_u is switched to the system target output Psys ** before correction, and the normal mode is restored.

  As a result, in this embodiment, as shown by the dotted line on the lower side of FIG. 6, the discharge amount of the storage battery 7 in the time zone (T1-T2) in which the solar radiation is sharply reduced is reduced, and the overdischarge state Can be prevented. When the system target output Psys * is not corrected, an overdischarge state can occur as indicated by a two-dot chain line on the lower side of FIG.

  In the present embodiment, even if the storage battery capacity is small, the allowable range of output fluctuation required by the administrator of the power system 12 can be satisfied. Therefore, in this embodiment, the reliability of the system output can be maintained and the power selling rate can be improved without reducing the fluctuation suppressing performance of the power generation system 1.

  In FIG. 6, the discharge amount reduction lowering output Plim_d and the discharge amount reduction increase output Plim_u are changed at constant change rates a1 and a2. However, the present invention is not limited to this. The rate of change for correcting the system target output may be arbitrarily selected within the allowable range of output fluctuation. The change rate a1 at the time of decrease and the change rate a2 at the time of increase may be different or the same. When the change rates a1 and a2 are set to be the same, the control is easy. Note that the system target output may be corrected using the variable limiter shown in FIG.

  FIG. 7 is an explanatory diagram illustrating a method of determining the slopes of the discharge amount reduction / decrease output Plim_d and the discharge amount reduction / decrease increase output Plim_u.

  First, the inclination a3 of the system target output Psys * per second is obtained. Next, in order to reduce the divergence Pb ** between the power generation output monitor signal Ppv_fb and the discharge amount reduction fall output Plim_d, the slope a1 of the discharge amount reduction fall output Plim_d is set to be steeper than the current slope a3. decide.

  As shown in FIG. 7, by setting a3 <a1, it is possible to reduce the difference between the power generation output monitor signal Ppv_fb and the discharge amount lowering output Plim_d. As a result, the amount of discharge for eliminating the divergence can be reduced as shown by the hatched portion, and the storage battery 7 can be prevented from being overdischarged.

  At the turn-back time Ts when the discharge amount reduction decrease output Plim_d coincides with the power generation output monitor signal Ppv_fb, the system target output Psys ** is switched to the discharge amount reduction increase output Plim_u. When the discharge amount reduction increase output Plim_u reaches the correction end time T2 that coincides with the power generation output monitor signal Ppv_fb, the correction of the system target output Psys ** is stopped and the normal mode is restored.

  Note that the discharge amount reduction output Plim_d and the discharge amount reduction increase output Plim_u in FIG. 7 are both shown as simplified straight lines, but are not limited thereto. The system target output can be corrected in a curved shape, a staircase shape, or the like. Further, as shown in FIG. 8, the same effect can be obtained even if a variable limiter is used.

  FIG. 9 is a flowchart showing a process for correcting the system target output. Although the outline has been described with reference to FIG. 7, it will be described more specifically with reference to FIG. This process only needs to be performed in the overall controller 9, and may be executed by the correction amount calculation unit 9123 of the system target output calculation unit 91 or may be executed by the output correction unit 92. Here, the operation subject of the correction process is described as the overall controller 9. The step is abbreviated as “S”.

  The overall controller 9 calculates a difference Pb ** between the system target output Psys ** and the power generation output monitor signal Ppv_fb (S10). The overall controller 9 determines whether or not the difference Pb ** between the system target output Psys ** and the power generation output monitor signal Ppv_fb exceeds a predetermined value ΔP (S11).

  If the overall controller 9 determines that the difference Pb ** exceeds the predetermined value ΔP (S11: YES), the overall controller 9 calculates the rate of change a1 of the discharge amount reduction descending output Plim_d based on the current slope a3 of the system target output Psys **. Calculate (S12).

  The overall controller 9 calculates the discharge amount reduction decrease output Plim_d using the change rate a1 calculated in step S12, and switches from the system target output Psys ** to the discharge amount reduction decrease output Plim_d (step 13).

  The overall controller 9 determines whether or not the discharge amount reduction decrease output Plim_d intersects the power generation output monitor signal Ppv_fb (S14), and if it intersects (S14: YES), calculates the rate of change a2 of the discharge amount reduction increase output Plim_u ( S15). In step S15, the rate of change a2 may be obtained by attaching a minus sign while maintaining the rate of change rate a1 of the discharge amount decreasing output Plim_d as it is.

  The overall controller 9 determines the discharge amount reduction increase output Plim_u based on the change rate a2 calculated in step S15, and switches the system target output from the discharge amount reduction decrease output Plim_d (S16).

  The overall controller 9 determines whether or not the discharge amount reduction increase output Plim_u and the system target output Psys ** intersect (S17). If they intersect (S17: YES), the system target before correction is determined from the discharge amount reduction increase output Plim_u. The mode is switched to the output Psys ** to return to the normal mode (S18), and this process is terminated.

  According to the present embodiment configured as described above, the system target output can be dynamically corrected according to the change in the power generation output of the solar power generation device, so that the storage battery 7 does not enter an overdischarged state. The charge / discharge target value Pb * can be adjusted. Therefore, according to the present embodiment, even if the capacity of the storage battery 7 is not increased, it is possible to satisfy the allowable range of output fluctuation required by the administrator of the power system 12 when the power generation output is reduced. As a result, according to the present embodiment, the reliability of the system output can be maintained without lowering the fluctuation suppressing performance of the power generation system 1, and the introduction cost of the storage battery 7 can be reduced.

  A second embodiment will be described with reference to FIG. The following embodiment including this embodiment corresponds to a modification of the first embodiment, and therefore, the difference from the first embodiment will be mainly described. In the present embodiment, the predicted solar radiation amount Ppre from the solar radiation prediction unit 13 is used instead of the generated power Ppv.

  The solar radiation predicting unit 13 predicts the solar radiation amount to the solar panel 4 from the weather data and the signal of the solar radiation sensor at a predetermined cycle, and outputs the prediction result as the predicted solar radiation amount Pre to the overall controller 9A of the present embodiment. To do. In the case of a wind turbine generator, the wind speed and direction can be predicted from an anemometer, an anemometer, weather data, and the like.

  In this embodiment, by using the predicted solar radiation amount Ppre, the system target output Psys ** can be corrected before the power generation output Ppv actually changes suddenly, and the storage battery 7 can be used in the normal use range (UL or higher, HL Less than a range).

  Further, in the present embodiment, the future SOC state can be predicted based on the change in the predicted solar radiation amount Ppre. The overall controller 9A can calculate a deviation threshold according to the predicted SOC state. Thereby, in a present Example, possibility that generation | occurrence | production of an overdischarge state can be prevented can be improved further.

  For example, the overall controller 9A decreases the time constant of the filter of the smoothing unit 911 when the predicted solar radiation amount Pre decreases. Thereby, the difference between the power generation output monitor signal Ppv_fb and the system target output Psys * is reduced, and the amount of discharge from the storage battery 7 can be reduced.

  In addition, this invention is not limited to the above-mentioned embodiment, Various modifications can be included. For example, the above embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to the one having all the configurations described. Also, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment. The technical features included in the present embodiment can be combined in addition to the combinations described in the claims.

  1: power generation system, 2: power storage system, 3: power control device, 4: solar panel, 5: PCS for sunlight, 6: PCS for storage battery, 7: storage battery, 9: general controller, 12: power system, 13 : Solar radiation prediction unit, 91: system target output calculation unit, 92: output correction unit, 911: smoothing unit

Claims (7)

A power fluctuation control device that suppresses fluctuations in power generation output of a renewable energy power generation device that generates power using renewable energy,
When a deviation degree between the first output target value obtained by smoothing the monitor value of the power generation output and the monitor value of the power generation output is detected, and the deviation degree satisfies a predetermined correction start condition, An output target value correcting unit that corrects the first output target value to the second output target value so that the degree of deviation decreases;
A charge / discharge target value control unit for controlling a charge / discharge output of a power storage device applied to the power generation output in order to reduce a difference between the second output target value and the monitor value of the power generation output;
With
The output target value correction unit corrects the first output target value to the second output target value so as to follow the change in the monitor value of the power generation output,
The output target value correction unit sets the second output target value to decrease at a predetermined first angle when the correction start condition is satisfied because the monitor value of the power generation output has decreased.
When the second output target value is less than or equal to the monitor value of the power generation output, the second output target value is set to increase at a predetermined second angle .
Power variation control device for renewable energy power generation device. The predetermined first angle and the predetermined second angle are set so as to satisfy a preset constraint condition,
The power fluctuation control apparatus of the renewable energy power generator according to claim 1 . The charge / discharge target value control unit calculates a difference between the second output target value and the monitor value of the power generation output as a charge / discharge target value, and calculates the charge / discharge target value from the amount of charge stored in the power storage device and the degree of divergence. And the corrected charge / discharge target value is given to the power storage device.
The power fluctuation control apparatus of the renewable energy power generator according to claim 2 . The predetermined first angle and the predetermined second angle are set to have the same absolute value.
The power fluctuation control apparatus of the renewable energy power generator according to claim 3 . The correction start condition is satisfied when the divergence degree exceeds a predetermined threshold.
The electric power fluctuation | variation control apparatus of the renewable energy electric power generating apparatus as described in any one of Claims 1-4 . The monitor value of the power generation output is generated based on a predicted value of renewable energy available in the renewable energy power generation device,
The electric power fluctuation | variation control apparatus of the renewable energy electric power generating apparatus as described in any one of Claims 1-4 . The output target value correcting unit corrects the first output target value to the second output target value by reducing a time constant of the smoothing process when the correction start condition is satisfied;
The power fluctuation control device for a renewable energy power generation device according to claim 6 .

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