JP2015192477A - Controller, control method, and power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably suppress voltage variation in system voltage without delay even when effective power output by a power generator receiving natural energy varies.SOLUTION: According to an embodiment, a controller is used for a power generation system that is connected to a power system through an interconnection line and includes a power converter for outputting power generated by a natural energy power supply for receiving natural energy to perform power generation, by performing control based on a command value of a power factor of generated power output, to a point of interconnection with the interconnection line. The controller includes power factor setting means for setting, on the basis of a ratio of a resistance component of system impedance of the interconnection line viewed from the interconnection point to a reactance component of the system impedance, a command value for a power factor of power generated by the natural energy power supply to the power converter in order to suppress variation in voltage of the power system accompanying variation in the power generated by the natural energy power supply.

Description

  Embodiments described herein relate generally to a control device, a control method, and a power generation system.

  In recent years, the introduction of natural energy power sources such as solar power generation devices has been advanced. When operating a power generation system using a natural energy power source with a maximum power factor of 1 giving priority to the efficiency of the PCS (Power Conditioner Subsystem), the effective power output by this system exceeds the power consumption, and the system voltage increases due to reverse power flow. It is suggested that this increase may deviate from the voltage management range by the power generation system. In order to prevent the system voltage from rising, there is a method of suppressing the system voltage fluctuation caused by the fluctuation of the active power output by separately using a phase adjusting facility such as a reactive power compensator.

JP2011-234620A

  The price of the phase adjusting equipment for introduction into the power generation system described above is expensive. Moreover, since this phase adjusting equipment controls the reactive power after detecting the fluctuation of the system voltage, the response speed becomes slow.

  The present invention has been made to solve the above-described problem, and even when the effective power output by power generation that receives natural energy changes, voltage fluctuation of the system voltage can be stably suppressed without delay. A control device, a control method, and a power generation system are provided.

  According to the embodiment, the control device controls the electric power generated by the natural energy power source that is connected to the power system by the interconnection line and generates power by receiving natural energy based on the command value of the power factor of the power generation output. It is a control device used for a power generation system having a power converter that outputs to a connection point with a connection line. This control device is used to suppress fluctuations in the voltage of the power system accompanying fluctuations in the power generated by the natural energy power source based on the ratio of the resistance and reactance of the system impedance of the interconnection line viewed from the connection point. And a power factor setting means for setting a power factor command value of the power generated by the natural energy power source in the power converter.

  ADVANTAGE OF THE INVENTION According to this invention, even when the active power output by the power generator which received natural energy changes, the voltage fluctuation of a system voltage can be suppressed stably without a delay.

The figure which shows the structural example of the solar energy power generation system in 1st Embodiment. The figure which shows the structural example of the solar energy power generation system in 2nd Embodiment. The figure which shows the structural example of the solar energy power generation system in 3rd Embodiment. The figure which shows the structural example of the solar energy power generation system in 4th Embodiment. The figure explaining an example of the operating range of the power converter of the solar energy power generation system in 4th Embodiment. The figure which shows the structural example of the solar energy power generation system in 5th Embodiment. The figure which shows the structural example of the solar energy power generation system in 6th Embodiment.

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

(First embodiment)
First, the first embodiment will be described. FIG. 1 is a diagram illustrating a configuration example of a photovoltaic power generation system according to the first embodiment.
In the first embodiment, the interconnection line 2 is connected to the main system 1 of the power system. Moreover, in the solar power generation system in this embodiment, the solar panel (solar power generation device) 6 is connected to the main system 1 via the power converter (PCS) 5 and the connection transformer 4. Connected to. Although this embodiment demonstrates the electric power generation system provided with the solar panel 6 as a natural energy power source which receives natural energy and generates electric power, a wind power generator etc. may be sufficient as this natural energy power source.

  The connection point 3 is connected to the main system 1 via the connection line 2. In addition, the photovoltaic power generation system in the present embodiment includes a monitoring control panel 7. The monitoring control board 7 has a power factor setting device 8. The power factor setter 8 gives the power converter 5 a power factor command value of the power generation output from the solar panel 6 via the power converter 5. This power factor command value is a command value for suppressing voltage fluctuation at the interconnection point 3 due to a change in active power output from the solar panel 6 to the interconnection point 3. The power converter 5 performs control to convert the DC power generated by the solar panel 6 into AC power based on the power factor command value, and outputs the AC power to the connection point 3 via the connection transformer 4.

  In the embodiment configured as described above, the power factor setting unit 8 is based on the ratio R / X of the resistance component R and the reactance component X of the system impedance (synthetic impedance) of the interconnection line 2 viewed from the interconnection point 3. To calculate the power factor command value. The calculation of the power factor command value will be described below. This ratio suppresses the fluctuation of the voltage vector at the connection point 3 due to the change in the active power output from the solar panel 6 to the connection point 3, and the voltage vector at the connection point 3 is changed to the voltage of the main system 1. This is the ratio to approximate the vector.

First, the voltage vector Vs of the main system 1, the voltage vector Vr at the connection point 3, the resistance R and reactance X of the system impedance of the connection line 2, and the current flowing from the power converter 5 to the connection point 3 The following formula (1), formula (2), and formula (3) are defined from the current vector I, the active power P ₀ and the reactive power Q ₀ from the solar panel 6 to the interconnection point 3.
Vs = Vr + (R + jX) I (1)
θ = −tan ⁻¹ (Q ₀ / P ₀ ) (2)
P ₀ + jQ ₀ = Vr × I (3)
Here, when the voltage vector Vr of the interconnection point 3 is taken as a phase reference, the equation (3) becomes the following equation (4).
I = (P ₀ −jQ ₀ ) / Vr (4)
By substituting the above equation (1) into this equation (4), the following equation (5) is obtained.
Vs = Vr + ((RP ₀ + XQ ₀ ) / Vr) + j ((XP ₀ −RQ ₀ ) / Vr) (5)
In order to bring the voltage vector Vr of the interconnection point 3 close to the voltage vector Vs of the main system 1, it is effective to set the difference in the same vector direction to zero.
RP ₀ + XQ ₀ = 0 Equation (6)
From the above equations (2) and (6), the following equation (7) is derived.
_{Q 0 / P 0 = -R /} X = -tanθ ... formula (7)
From this equation (7), the power factor command value cos θ is expressed by the following equation (8).
cos θ = 1 / √ (1 + tan ² θ) = 1 / √ (1+ (R / X) ² ) (8)
As shown in the equation (8), the power factor setting unit 8 obtains a unique power factor command value from the ratio of the resistance component R and the reactance component X of the system impedance of the connection line 2 viewed from the connection point 3. be able to. As the ratio of the resistance component R and the reactance component X of the system impedance, for example, a design value or an external value is set in the internal memory of the power factor setting unit 8. Further, the power factor setting unit 8 may detect, for example, the active power P ₀ and the reactive power Q ₀ to the interconnection point 3 and obtain these values using the detected value and the equation (7), or the power factor setting. The detector 8 may detect the voltage vector Vs, the voltage vector Vr, and the current vector I, and use the detection result and the equation (3) to obtain them.

In this embodiment, a unique power factor command value obtained from the resistance component R and reactance component X of the system impedance of the interconnection line 2 viewed from the connection point 3 is set in the power factor setting unit 8 of the monitoring control panel 7. The power factor setter 8 gives this power factor command value to the power converter 5. By doing so, the fluctuation of the voltage vector at the interconnection point 3 can be suppressed and brought close to the voltage vector of the main grid 1, so that it is output from the solar panel 6 of the photovoltaic power generation system to the interconnection point 3. As the active power P ₀ changes, the reactive power Q ₀ can be controlled so that the power factor becomes constant as the power factor command value.

According to this embodiment, even if the effective power P ₀ output from the solar panel 6 of the solar power generation system to the connection point 3 changes suddenly due to a change in the amount of solar radiation, from the solar panel 6 of the solar power generation system. adjust the reactive power Q ₀ to be output to the connecting point 3 can be suppressed without delay voltage variation interconnection node 3 due to a change in active power P _0. In this way, voltage fluctuations in the power system caused by fluctuations in the active power output on the natural energy power source side can be stably suppressed without delay.

(Second Embodiment)
Next, a second embodiment will be described. FIG. 2 is a diagram illustrating a configuration example of the photovoltaic power generation system according to the second embodiment.
In a normal power system, since the fluctuation of the ratio R / X obtained from the resistance R and reactance X of the system impedance of the interconnection line 2 as viewed from the connection point 3 is small, in the first embodiment, this ratio R / X was fixed. However, when the configuration of the power system changes greatly, the ratio R / X also changes greatly.

In contrast, in the second embodiment, the monitoring control panel 7 obtains information indicating that the ratio R / X has changed. Then, a new power factor command value corresponding to this information is given to the power converter 5 from the power factor setting unit 8 of the monitoring control panel 7. This can suppress a voltage fluctuation of the connecting point 3 due to a change in active power P ₀ which is output from the solar panels 6 of photovoltaic systems interconnection point 3 to the interconnection point 3.

  The photovoltaic power generation system according to the second embodiment further includes a power supply command station 9. The power supply command station 9 obtains the ratio R / X of the resistance R of the system impedance of the interconnection line 2 and the reactance X as described in the first embodiment, or obtains it from the outside, as described in the first embodiment. To the power factor setting unit 8. When the ratio R / X changes due to a change in the configuration of the power system, the power supply command station 9 obtains the changed ratio R / X again as described in the first embodiment or from the outside. Or sent to the monitoring control panel 7.

In the internal memory of the power factor setting unit 8 of the monitoring control panel 7, information on power factor command values corresponding to a plurality of predetermined ratios R / X is stored in advance. The power factor setting unit 8 reads a power factor command value corresponding to the ratio R / X sent from the power supply command station 9 from the internal memory. The power factor setter 8 gives the read power factor command value to the power converter 5. In this way, as described in the first embodiment, the power factor becomes the power factor command value in accordance with the change in the effective power P ₀ output from the solar panel 6 of the photovoltaic power generation system to the interconnection point 3. Can be controlled so as to adjust the reactive power Q ₀ so that it becomes constant.

According to this embodiment, even when the system impedance changes greatly, the change in the effective power P ₀ output from the solar panel 6 of the solar power generation system to the interconnection point 3 is the same as in the first embodiment. It is possible to suppress the voltage fluctuation at the interconnection point 3 due to the delay without delay.

(Third embodiment)
Next, a third embodiment will be described. FIG. 3 is a diagram illustrating a configuration example of the photovoltaic power generation system according to the third embodiment.
In the second embodiment described above, the monitoring control panel 7 obtains information on the ratio R / X of the resistance R and reactance X of the system impedance of the interconnection line 2 from the power supply command station 9. However, there are cases where the monitoring control panel 7 cannot obtain information on the ratio R / X from the power supply command station 9. As a countermeasure, in the third embodiment, the power factor command value is corrected to an optimum value in accordance with information obtained from the power converter 5 side. Thereby, the voltage fluctuation of the connection point 3 resulting from only a solar power generation system can be suppressed.

In contrast, in the third embodiment, the photovoltaic power generation system further includes a voltage detector 10 as compared with the first embodiment. The voltage detector 10 detects the voltage vector Vr at the interconnection point 3.
In the third embodiment, the monitoring control panel 7 further includes a power factor corrector 11, a level detector 12, a limiter 31, and an integrator 32, as compared with the first embodiment.
The power factor corrector 11 corrects the power factor command value given from the power factor setting unit 8 of the monitoring control panel 7 to the power converter 5.
A procedure for obtaining the correction value of the power factor command value will be described. The monitoring control board 7 obtains a voltage deviation ΔV between the voltage vector Vr detected by the voltage detector 10 and the voltage reference value _Vref .

  In the limiter 31, a dead zone (± X%) of the voltage deviation ΔV is set. The integrator 32 performs integration from the timing when the voltage deviation ΔV passing through the limiter 31 exceeds the width of the dead zone to the timing when the voltage deviation ΔV returns within the dead zone.

  When the output value from the integrator 32 reaches a predetermined set value for the power factor increase, the level detector 12 obtains a power factor correction value for the power factor increase in accordance with the output value and calculates the power factor corrector. 11 is input. The predetermined set value for the power factor increase is a set value indicating that a fluctuation exceeding the upper limit of the dead band for the voltage vector Vr has occurred over a predetermined time or more. The power factor correction value corresponding to the power factor increase is a correction value for keeping the voltage deviation ΔV within the upper limit of the dead zone.

  Further, when the output value from the integrator 32 reaches a predetermined set value for the power factor decrease, the level detector 12 obtains a power factor correction value for the power factor decrease according to the output value and calculates the power factor. Input to the corrector 11. The predetermined set value for the power factor decrease is a set value indicating that a fluctuation that is less than the lower limit value of the dead zone for the voltage vector Vr has occurred over a predetermined time or more. The power factor correction value corresponding to the power factor decrease is a correction value for setting the voltage deviation ΔV within the lower limit value of the dead zone.

The power factor corrector 11 gives the power converter 5 a value obtained by correcting the power factor command value output from the power factor setter 8 with the power factor correction value from the level detector 12.
Thus, in the third embodiment, the voltage detector 10 monitors the voltage vector Vr at the interconnection point 3. When the fluctuation exceeding the dead band width occurs for the voltage vector Vr over a predetermined time or longer, the power factor command value corrected so that the fluctuation does not exceed the dead band width is given to the power converter 5. . By doing in this way, the reactive power Q is set so that the power factor becomes constant as the power factor command value in accordance with the change in the effective power P ₀ output from the solar panel 6 of the photovoltaic power generation system to the interconnection point 3. It can be controlled to adjust ₀ .

(Fourth embodiment)
Next, a fourth embodiment will be described. FIG. 4 is a diagram illustrating a configuration example of the photovoltaic power generation system according to the fourth embodiment.
In the above-described third embodiment, the power converter 5 is provided with a power factor command value at which the output current of the power converter 5 is outside the range allowed by the power converter 5 only by the information obtained from the terminal. It may be possible to end up. As a countermeasure, for example, a limiter is provided to control the power factor command value so that the power converter 5 does not give a power factor command value in which the output current of the power converter 5 is outside the range allowed by the power converter 5. It is possible to do.

  On the other hand, the configuration of the fourth embodiment is a configuration that does not give the power converter 5 a power factor command value at which the output current of the power converter 5 is outside the range allowed by the power converter 5. As a specific configuration, the monitoring control panel 7 of the photovoltaic power generation system according to the fourth embodiment further includes a power factor calculator 13 as compared with the third embodiment.

  The power factor calculator 13 performs a calculation to make the power factor command value corrected by the power factor corrector 11 a value that does not exceed the power factor range allowed by the power converter 5. The command value obtained is given to the power converter 5. This allowable power factor range is a range from the maximum power factor 1 to the minimum power factor cos θa.

FIG. 5 is a diagram for explaining the operating range of the power converter 5 in the fourth embodiment. As shown in FIG. 5, in the present embodiment, a maximum current range 21 wider than the rated current range 20 so that the power converter 5 can output active power P ₀ rated at the maximum power factor 1 and the rated current range 20. Is acceptable. Thereby, even when the power factor applied to the power converter 5 is the minimum power factor cos θa shown in FIG. 5, the power converter 5 can output the active power P ₀ , the reactive power Q ₀ , and the apparent power S _0. It becomes.

(Fifth embodiment)
Next, a fifth embodiment will be described. FIG. 6 is a diagram illustrating a configuration example of the photovoltaic power generation system according to the fifth embodiment.
In the second embodiment described above, the monitoring control panel 7 obtains information on the ratio R / X of the resistance R and reactance X of the system impedance of the interconnection line 2 from the power supply command station 9. However, there are cases where the monitoring control panel 7 cannot obtain information on the ratio R / X from the power supply command station 9. As a countermeasure, in the fifth embodiment, an optimum power factor command value corresponding to information obtained from the own end is calculated and given to the power converter 5. Thereby, the voltage fluctuation of the connection point 3 resulting from only a solar power generation system can be suppressed.

  On the other hand, the photovoltaic power generation system in the fifth embodiment includes a voltage detector 10, a current detector 14, an active power detector 15, and a reactive power detector 16 as compared with the first embodiment. In the fifth embodiment, the monitoring control panel 7 further includes a power factor calculator 17, an active power setting unit 18, and a reactive power setting unit 19 as compared with the first embodiment.

  The active power setting unit 18 of the monitoring control panel 7 gives the power converter 5 an arbitrary active power command value for temporarily changing the active power output. When the active power command value is given to the power converter 5, the voltage at the interconnection point 3 changes. The voltage detector 10 detects this changing voltage. The current detector 14 detects a current flowing from the power converter 5 to the interconnection point 3. The active power detector 15 detects an active power output value based on the voltage value detected by the voltage detector 10 and the current value detected by the current detector 14.

  The reactive power setting unit 19 of the monitoring control panel 7 gives an arbitrary reactive power command value for temporarily changing the reactive power output to the power converter 5. When the reactive power command value is given to the power converter 5, the voltage at the interconnection point 3 changes. The voltage detector 10 detects this changing voltage. The current detector 14 detects a current flowing from the power converter 5 to the interconnection point 3. The reactive power detector 16 detects a reactive power output value based on the voltage value detected by the voltage detector 10 and the current value detected by the current detector 14.

  The power factor calculator 17 of the monitoring control panel 7 obtains an appropriate power factor command value and inputs it to the power factor setter 8. The power factor setter 8 gives the input power factor command value to the power converter 5. The calculation by the power factor calculator 17 will be described later.

As described above, the active power setting unit 18 of the monitoring control panel 7 gives an arbitrary active power command value to the power converter 5. In this embodiment, the deviation ΔP between the active power P ₀ detected by the active power detector 15 and the active power output value detected by the active power detector 15 immediately before the power factor command value is given from the power factor setter 8 is Input to the power factor calculator 17.
The voltage value detected by the voltage detector 10 changes when the active power setting unit 18 gives an arbitrary active power command value to the power converter 5. The power factor calculator 17 inputs a voltage variation ΔVp that is a deviation between the changed voltage value and the voltage reference V _pref . The voltage reference V _pref is a reference value of the voltage of the magnetic pole direction component of the rotating coordinate system at the interconnection point 3.

In the present embodiment, after the active power command value from the active power setter 18 is returned to be the active power P ₀ , the reactive power setter 19 of the monitoring control panel 7 is the power converter as described above. An arbitrary reactive power command value is given to 5. In the present embodiment, the deviation ΔQ between the reactive power Q ₀ detected by the reactive power detector 16 and the reactive power output value detected by the reactive power detector 16 immediately before the power factor command value is given from the power factor setting unit 8 is Input to the power factor calculator 17.
The voltage value detected by the voltage detector 10 changes when the reactive power setter 19 gives an arbitrary reactive power command value to the power converter 5. The power factor calculator 17 inputs a voltage variation ΔVq which is a deviation between the changed voltage value and the voltage reference V _qref . The voltage reference V _qref is a reference value of the voltage of the component perpendicular to the magnetic pole in the rotating coordinate system at the interconnection point 3.

The power factor calculator 17 uses these input results as the active power deviation ΔP, the voltage fluctuation ΔVp, the reactive power deviation ΔQ, the voltage fluctuation ΔVq and the following equation (9) to obtain an optimum power factor command. A value cos θ is calculated, and the calculation result is input to the power factor setting unit 8. The power factor setter 8 gives this power factor command value to the power converter 5.
cos θ = (ΔVp / ΔP) / √ ((ΔVp / ΔP) ² + (ΔVq / ΔQ) ² ) (9)
By doing in this way, the reactive power Q is set so that the power factor becomes constant as the power factor command value in accordance with the change in the effective power P ₀ output from the solar panel 6 of the photovoltaic power generation system to the interconnection point 3. Control for adjusting ₀ can be performed.

(Sixth embodiment)
Next, a sixth embodiment will be described. FIG. 7 is a diagram illustrating a configuration example of the photovoltaic power generation system according to the sixth embodiment.
In the above-described fifth embodiment, the power converter 5 is provided with a power factor command value at which the output current of the power converter 5 is outside the range allowed by the power converter 5 only by the information obtained from its own end. It may be possible to end up. As a countermeasure, for example, a limiter is provided to control the power factor command value so that the power converter 5 does not give a power factor command value at which the output current of the power converter 5 is outside the range allowed by the power converter 5. It is possible.

  On the other hand, the configuration of the sixth embodiment is a configuration that does not give the power converter 5 a power factor command value at which the output current of the power converter 5 is outside the range allowed by the power converter 5. As a specific configuration, the monitoring control panel 7 of the photovoltaic power generation system in the sixth embodiment further includes a power factor calculator 13 as compared with the fifth embodiment.

  The power factor calculator 13 calculates the power factor command value from the power factor setter 8 to a value that does not exceed the range of the power factor allowed by the power converter 5 described in the fourth embodiment. And the calculated command value is given to the power converter 5.

In the present embodiment configured as described above, as shown in FIG. 5 described in the fourth embodiment, the power converter 5 outputs the active power P ₀ rated at the maximum power factor 1 and the rated current range 20. A maximum current range 21 wider than the rated current range 20 is allowed as possible. Thus, even when the power factor applied to the power converter 5 is the minimum power factor cos θa shown in FIG. 5, the power converter 5 can output the active power P ₀ , the reactive power Q ₀ , and the apparent power S _0. It becomes.

  Although several embodiments of the 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 ... Master system, 2 ... Connection line, 3 ... Connection point, 4 ... Connection transformer, 5 ... Power converter, 6 ... Solar power panel, 7 ... Monitoring control panel, 8 ... Power factor setting device, DESCRIPTION OF SYMBOLS 9 ... Power supply command place, 10 ... Voltage detector, 11 ... Power factor corrector, 12 ... Level detector, 13 ... Power factor calculator, 14 ... Current detector, 15 ... Active power detector, 16 ... Reactive power detection 17 ... Power factor calculator, 18 ... Active power setter, 19 ... Reactive power setter, 20 ... Rated current range, 21 ... Maximum current range, 31 ... Limiter, 32 ... Integrator.

Claims (8)

The power generated by a natural energy power source that is connected to the power system through a connection line and generates power by receiving natural energy is controlled based on the command value of the power factor of the power generation output to be a connection point with the connection line. A control device used in a power generation system having an output power converter,
Based on the ratio of the resistance component and reactance component of the system impedance of the interconnection line viewed from the interconnection point, for suppressing the fluctuation of the voltage of the power system accompanying the fluctuation of the power generated by the natural energy power source A control device comprising power factor setting means for setting a command value of the power factor in the power converter. The power factor setting means includes
2. The control device according to claim 1, wherein when information indicating that the ratio has changed is obtained from the outside, the new command value is set in the power converter based on the changed ratio. . When the voltage value at the interconnection point is outside the predetermined range for a predetermined time or longer, the power factor set by the power factor setting means is set so that the voltage value at the interconnection point is within the predetermined range. The control device according to claim 1, further comprising power factor correction means for correcting. When the voltage value at the interconnection point is outside the predetermined range for a predetermined time or longer, the power factor set by the power factor setting means is set so that the voltage value at the interconnection point is within the predetermined range. Power factor correction means to correct;
Power factor calculation means for calculating the command value of the power factor for making the output current of the power converter within a predetermined allowable range based on the command value of the power factor corrected by the power factor correction means; The control device according to claim 1, further comprising: Power factor calculation means for calculating the command value of the power factor based on the variation of the voltage value at the interconnection point by temporarily varying the active power and reactive power of the power generation output of the natural energy power source Further comprising
The power factor setting means includes
The control device according to claim 1, wherein the power factor command value calculated by the power factor calculation unit is set in the power converter. Power factor calculation means for calculating the command value of the power factor based on the variation of the voltage value at the interconnection point by temporarily varying the active power and reactive power of the power generation output of the natural energy power source Further comprising
The power factor setting means sets the command value of the power factor calculated by the power factor calculation means to the power converter,
Power factor calculation means for calculating the power factor command value for setting the output current of the power converter within a predetermined allowable range based on the power factor command value set by the power factor setting means. The control device according to claim 1, further comprising: The power generated by a natural energy power source that is connected to the power system through a connection line and generates power by receiving natural energy is controlled based on the command value of the power factor of the power generation output to be a connection point with the connection line. A method used in a power generation system having an output power converter,
Based on the ratio of the resistance component and reactance component of the system impedance of the interconnection line viewed from the interconnection point, for suppressing the fluctuation of the voltage of the power system accompanying the fluctuation of the power generated by the natural energy power source A control method characterized by setting a command value of the power factor in the power converter.   A power generation system comprising the control device according to claim 1 and the power converter.

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