JP2007195315A - Method and apparatus for controlling operation of wind turbine generator system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for controlling the operation of a wind turbine generator system wherein a variable speed operation range can be expanded over an entire wind speed range from a low wind speed range in which the induced voltage of a generator is lower than a voltage required on the power consuming system side to a high wind speed range in which the wind speed is equal to or higher than a rated wind speed through a simplified control circuit with a minimized number of switching elements. <P>SOLUTION: The operation controlling means is for wind turbine generator systems. According to the numbers of revolutions of a wind turbine and a generator, it divides the operation mode of the wind turbine and the generator into three speed control modes: low wind speed control mode in which the induced voltage of the generator is lower than the voltage required on the power consuming system side; high wind speed control mode in which the wind speed of the wind turbine is equal to or higher than the rated wind speed; and intermediate wind speed control mode in which the wind speed is between the wind speed in low wind speed control mode and the wind speed in high wind speed control mode. In low wind speed control mode, a step-up chopper circuit for increasing the voltage of the generator is activated. In operation mode in which a certain value is exceeded, the operation of the step-up chopper circuit is stopped. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an operation control method and apparatus for a wind power generation system including a windmill and a generator that is directly connected to the windmill, and more particularly to an operation control method for a wind power generation system including a step-up chopper circuit that increases a generator voltage. And an apparatus for the same.

Currently, introduction of a PWM converter type variable speed wind power generation system (PWM converter type) using a PWM converter as a converter is in progress. The PWM converter uses many switching elements, and its control is complicated and expensive.However, vector control can be implemented, and high-speed and high-accuracy generator torque control is possible. It is used in large-capacity variable-speed wind power generation systems that require control.
In addition, when using a permanent magnet synchronous generator as a generator, it is not necessary to supply excitation energy from a converter like an induction generator, so a small-capacity wind power generation system for battery charging etc. A diode bridge rectifier is used as a converter, and it is operated mainly at a rated wind speed at which an induced voltage can be sufficiently obtained.

An advantage of a wind power generation system (diode rectification method) using such a diode bridge rectifier as a converter is that a converter can be configured at low cost.
However, in the diode rectification type wind power generation system as described above, since the torque control of the generator cannot be performed by the converter alone, it is difficult to control the wind turbine speed, and when considering the system linkage, the low wind speed Then, there also exists a problem that the induced voltage required in order to link | link a system | strain cannot be obtained.

As one of the wind power generation systems that obtain an induced voltage necessary for system linkage at a low wind speed as described above, a technique of Patent Document 1 (Japanese Patent Laid-Open No. 2003-88190) is provided.
In such a technique, a boost chopper circuit is provided on the power use system side of the generator, and the generated voltage of the generator is generated by the boost chopper circuit at a low wind speed when the induced voltage of the generator is lower than the required voltage on the power use system side. The voltage is boosted to a certain voltage and supplied to the frequency converter on the power usage system side.

JP 2003-88190 A

In a wind power generation system that uses a permanent magnet synchronous generator (hereinafter referred to as a generator) as a generator, the induced voltage of the generator uses power with a simplified control circuit with a minimum number of switching elements. It is required that the variable speed operation range can be expanded over a whole wind speed range from a low wind speed range lower than the required voltage on the system side to a high wind speed range where the wind speed is equal to or higher than the rated wind speed.
However, in the technique of Patent Document 1 (Japanese Patent Laid-Open No. 2003-88190), the voltage generated by the generator is kept constant by the boost chopper circuit at a low wind speed when the voltage is lower than the required voltage on the power usage system side. Only means for boosting the voltage is shown, and this problem cannot be solved.

  In view of the problems of the conventional technology, the present invention provides a low wind speed region in which the induced voltage of the generator is lower than the required voltage on the power usage system side with a control circuit simplified by minimizing the number of switching elements. It is an object of the present invention to provide an operation control method for a wind power generation system and an operation control device thereof that can expand a variable speed operation range over the entire wind speed range from the wind speed to a high wind speed range where the wind speed is equal to or higher than the rated wind speed.

  The present invention achieves such an object, and is an operation control method of a wind power generation system including a windmill and a generator that is directly connected to the windmill, and an operation mode in the operation of the windmill and the generator is set to the operation mode of the windmill. The low wind speed control mode in which the induced voltage of the generator is lower than the necessary voltage on the power usage system side, the high wind speed control mode in which the wind speed of the wind turbine is equal to or higher than the rated wind speed, depending on the wind speed and the number of revolutions of the generator, The wind speed is divided into three speed control modes: a medium wind speed control mode in which the wind speed is between the wind speed in the low wind speed control mode and the rated wind speed. Of the three speed control modes, power generation is performed in the low wind speed control mode. A step-up chopper circuit that raises the machine voltage is activated, and the operation of the step-up chopper circuit is stopped in the medium wind speed control mode and the high wind speed control mode. To (claim 1).

In addition, the invention of the apparatus for carrying out the operation control method of the wind power generation system as described above,
An operation control device for a wind power generation system comprising a windmill and a generator directly connected to the windmill, wherein a detected value of a wind speed of the windmill and a detected value of an induced voltage of the generator are input, and the induction of the generator When the detected voltage value is lower than the required voltage on the power usage system side, the detected value of the wind speed is set to the low wind speed control mode, and when the detected value of the wind speed of the wind turbine is equal to or higher than the rated wind speed, the detected value of the wind speed is set to the high wind speed control mode. Control mode switching means for switching to the medium wind speed control mode when the wind speed is in the middle wind speed region between the wind speed and the rated wind speed in the low wind speed control mode is provided, and the control mode switching means switches the low wind speed control mode. The boost chopper circuit for raising the generator voltage is sometimes operated (claim 4).

According to this invention, the control mode switching means is provided, and the wind speed control mode is divided into the three wind speed control modes of the low wind speed control mode, the medium wind speed control mode, and the high wind speed control mode by the control mode switching means. Based on the detected value of the wind speed and the detected value of the induced voltage of the generator, the boost chopper circuit is switched to the low wind speed control mode when the induced voltage detected value of the generator is lower than the required voltage on the power usage system side. Activate to increase generator voltage.
As a result, the step-up chopper circuit is operated only in the low wind speed control mode where the generator voltage needs to be increased to maintain the required power usage system side voltage, and the three wind speed control modes are combined with the medium wind speed control mode and the high wind speed control mode. Stable operation at the required voltage is possible by dividing it into speed control modes, and the variable speed range can be expanded with a small number of switching elements and a simplified control circuit. A wind power generation system with the characteristics can be obtained.

In this invention, specifically, the following configuration is preferable.
That is, the control mode switching means performs generator speed control using an inverter drive circuit with a constant wind turbine pitch angle in the medium wind speed control mode, and the pitch angle using pitch angle control means in the high wind speed control mode. Control is performed (claims 2 and 5).
More specifically, the medium wind speed control mode includes the first medium wind speed control mode and the generator speed in the wind speed range until the generator speed reaches the upper limit speed through the low wind speed control mode. This is performed in the second medium wind speed control mode in the wind speed range where the wind speed of the wind turbine is equal to or lower than the rated wind speed at the upper limit rotation speed.

If configured in this way,
In the low wind speed control mode, the speed of the wind turbine is controlled by controlling the generator torque by adjusting the armature current of the generator with the boost chopper circuit,
In the medium wind speed control mode, the wind turbine speed control is performed by controlling the generator torque by adjusting the DC link voltage with the grid-linked inverter,
In the high wind speed control mode above the rated wind speed, the wind turbine torque is controlled by adjusting the pitch angle by the pitch angle control system.
By hybridizing the three speed control modes, the variable speed range can be expanded, and system interconnection is possible in all control modes.

According to the present invention, the boost chopper circuit is operated only in the low wind speed control mode in which the generator voltage needs to be increased, thereby obtaining an induced voltage required for system linkage on the power usage system side. Wind power generation that enables stable operation in the wind speed range, expands the variable speed range with a simple control circuit with a small number of switching elements, reduces costs, and provides high reliability A system is obtained.
In the low wind speed control mode, the boost chopper circuit obtains the induced voltage required for system linkage on the power usage system side to control the generator torque to control the wind turbine speed. In the medium wind speed control mode, the system linkage inverter The wind turbine speed is controlled by controlling the generator torque by adjusting the DC link voltage, and the wind turbine torque is controlled by adjusting the pitch angle by the pitch angle control system in the high wind speed control mode above the rated wind speed. Therefore, the variable speed range can be expanded by hybridizing the three speed control modes, and system interconnection is possible in all control modes.
Further, according to the present invention, since the boosting switching element does not work in the operation in the mode other than the low wind speed control mode, the switching loss can be reduced as compared with the control system that always works the boosting chopper circuit.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

FIG. 1 is an operation control device control block diagram of a wind power generation system according to an embodiment of the present invention.
In FIG. 1, 100 is a windmill, 101 is a blade of the windmill 100, 102 is a rotor head, and 104 is a main shaft. Reference numeral 105 denotes a generator that is rotationally driven by the windmill. In this embodiment, the generator is a permanent magnet type multi-pole synchronous generator (hereinafter referred to as a generator). 107 is a converter that converts the generated power of the generator 105 into direct current, 106 is a reactor, 109 is a diode, 108 is a boosting switching element for boosting the generated voltage from the generator that has passed through the converter 107, and 110 is a capacitor , 111 is a resistor, 112 is an inverter that performs reverse conversion to alternating current, and 113 is a grid.
Reference numeral 103 denotes a pitch driving device that changes the pitch angle of the blade 101, and reference numeral 5 denotes pitch angle control means for controlling the pitch angle of the blade 101 via the pitch driving device 103.

8 is a step-up chopper drive circuit for driving the step-up switching element 108, and 10 is a step-up chopper time ratio control means for controlling the time ratio of the step-up chopper drive circuit 8.
The step-up chopper drive circuit 8, the step-up switching element 108, the step-up chopper time ratio control means 10 and the like constitute a step-up chopper circuit.
9 is an inverter drive circuit for driving the inverter 112, and 11 is an inverter control means for controlling the inverter drive circuit 9 by a control logic to be described later.
4 is a speed sensor for detecting the rotational speed of the generator 105 (generator rotational speed), 3 is a wind speed sensor for detecting the wind speed to the wind turbine 100, and 6 is a voltage (boosted voltage) after being boosted by a boost chopper circuit described later. A DC voltage sensor 7 detects the AC current and voltage after the inverter 112, and a current / voltage sensor.

Reference numeral 1 denotes a control mode switching means which is the gist of the present invention. The detected value of the wind speed from the wind speed sensor 3, the detected value of the generator speed from the speed sensor 4, and the DC of the generator from the DC voltage sensor 6. A detection value of the link unit voltage (the induced voltage of the generator boosted by the boost chopper) is input, and control mode switching as described later is performed based on the detection signal.
Reference numeral 2 denotes a generator rotational speed target value generating means, which receives a wind speed detection value Uw from the wind speed sensor 3, and based on the wind speed detection value, a means for generating the target rotational speed (generator target rotation) of the generator 105 by means described later. Number).

Next, based on FIGS. 2-8, operation | movement of each control means of the operation control apparatus of the wind power generation system shown in FIG. 1 is demonstrated.
FIG. 2 is a control block diagram of the control mode switching means 1 in the embodiment of the present invention.
The control mode switching means 1 includes a detected value of the wind speed Uw input from the wind speed sensor 3, a detected value of the generator rotational speed ωg input from the speed sensor 4, and a generator input from the DC voltage sensor 6. The mode is determined based on the detected value of the DC link unit voltage Vdc, and the mode signal Mod is output.

That is, the control mode switching condition by the control mode switching means 1 is:
When Uin ≦ Uw and Vdc ≦ Vdc0 → Mode 1 or low wind speed control mode Vdc> Vdc0 and ωg <ωmax → Mode 2 or medium wind speed control mode (1)
ωg ≧ ωmax, Uw ≦ Urat → mode 3, that is, medium wind speed control mode (2)
Uw> Urat → mode 4, that is, high wind speed control mode where Uin = cut-in wind speed
Vdc0 = Generator induced voltage required for grid connection (required voltage on the power usage system side)
ωmax = generator rotation speed upper limit
Urat = Rated wind speed

FIG. 3 is a characteristic diagram of the wind turbine output and the generator rotational speed with respect to the wind speed in the embodiment.
In FIG. 3, A is the operation start point (cut-in wind speed Uin point), B is the generator induced voltage (necessary voltage on the power usage system side) Vdc0 required for grid interconnection, and DC link unit voltage (generator induced voltage). ) A point higher than Vdc (Vdc ≦ Vdc0), C is a point where the generator rotational speed ω reaches the generator rotational speed target value ωf (smaller than the generator rotational speed upper limit value ωmax), D is the wind speed U rated Is the point where the wind speed Urat is reached.
The control mode switching condition is:
A to B: Mode 1 or low wind speed control mode B to C: Mode 2 or medium wind speed control mode (1)
C to D: Mode 3, that is, medium wind speed control mode (2)
D˜: Mode 4 or high wind speed control mode

Next, the target value ωf of the generator rotational speed is calculated by the following procedure.
FIG. 4 is a block diagram for calculating the target value of the generator speed, and FIG. 5 is a calculation diagram for the output coefficient.
In FIG. 4, the detected value of the wind speed Uw input from the wind speed sensor 3 to the generator rotational speed target value generating means 2 is a proportional constant set in the coefficient unit 31 in the generator rotational speed target value generating means 2. The current value ω1 of the generator speed is calculated by multiplying by K and input to the low selector 32.
A preset generator rotational speed upper limit value ωmax (see FIG. 3) is input to the low selector 32. In the low selector 32, the current value ω1 of the generator rotational speed and the generator rotational speed upper limit value are set. The value ωmax is compared with the smaller rotational speed as the generator rotational speed target value ωf.
That is, the generator rotational speed target value ωf is limited so as not to operate when the generator rotational speed upper limit ωmax is exceeded.
Here, the proportionality constant K is determined such that the blade output coefficient Cp becomes the maximum peripheral speed ratio even when the wind speed Uw changes.
That is, as shown in FIG. 5, the blade output coefficient Cp is a function of the peripheral speed ratio λ of the blade, and for calculating the proportionality constant K, the blade output coefficient Cp corresponding to the maximum value λmax of the peripheral speed ratio λ is used.

Next, the operation control method in the modes 1 to 4 will be described.
・ Mode 1 (Low wind speed control mode)
In this mode, the booster chopper circuit constituted by the booster chopper drive circuit 8, the booster switching element 108, the booster chopper time ratio control means 10 and the like in FIG. 1 is operated to raise the generator voltage.
That is, FIG. 6 is a control block diagram of the step-up chopper circuit. In the figure, the generator rotational speed target value ωf calculated based on the block diagram of FIG. 4 and the generator rotational speed detection value from the speed sensor 4 are shown. ωg is input to the subtracter 35 of the boost chopper duty ratio control means 10. The PI controller 36 performs a PI control operation on the deviation of the rotational speed calculated by the subtractor 35 to calculate a DC link unit voltage (generator induced voltage) Vdc and inputs it to the switch unit 37.
In the switch unit 37, when the DC link unit voltage (generator induced voltage) Vdc is less than or equal to the generator induced voltage (necessary voltage on the power use system side) Vdc0 required for grid connection (Vdc ≦ Vdc0), The pulse generator 38 is driven by switching to the mode 1, and the step-up chopper drive circuit 8 is operated by the pulse generator 38. When Vdc> Vdc0, the modes 2 to 4 are selected, the PI control output is set to 0, and the boost chopper circuit is not operated.

The step-up chopper drive signal from the step-up chopper drive circuit 8 is input to the step-up switching element 108. By the operation of the step-up chopper circuit, the power generation voltage of the power generator 105 that has passed through the converter 107 is increased.
Thus, by operating the boost chopper circuit only in the low wind speed control mode (mode 1) in which the generator voltage needs to be increased, the generator induced voltage required for grid interconnection (the required voltage on the power usage system side) Can be held.

Mode 2 (medium wind speed control mode (1)) and mode 3 (medium wind speed control mode (2))
In mode 2, the generator induced voltage (required voltage on the power use system side) Vdc0 required for grid interconnection in FIG. 3 is higher than the DC link unit voltage (generator induced voltage) Vdc (Vdc ≦ Vdc0). Is a control mode from point B to point C where the generator rotational speed ωg reaches the generator rotational speed target value ωf (smaller than the generator rotational speed upper limit value ωmax). This is a control mode from point C, which is the rotational speed target value ωf, to point D, which is a point that reaches the rated wind speed Urat.
In such mode 2 and mode 3, as shown in FIG. 1, the generator torque of the generator 105 is controlled by adjusting the DC link voltage Vdc by the inverter 112, the inverter drive circuit 9 and the inverter control means 11, and the wind turbine speed is adjusted. Take control.

That is, FIG. 7 is a block diagram of inverter control performed in the mode 2 and the mode 3.
In FIG. 7, in such an inverter control system, the DC link voltage Vdc is controlled to a DC link voltage Vds that can be linked. Furthermore, in mode 2 and mode 3, speed control of the generator 105 is performed. In mode 4, the generator output control is performed by the pitch angle control means 5 that controls the pitch angle of the blade 101, and the voltage Vds that can be linked is corrected.

In the inverter control by the inverter control means 11 shown in FIG. 7, the d-axis current target value isdf is output from the PI controller 91 in the DC link voltage control unit, and the PI controller is calculated from the deviation from the measured d-axis current isd. The PI control calculation is performed at 92, and the PI control calculation is performed by the PI controller 93 from the deviation between the q-axis current target value (0 when maintaining the power factor of 1) isqf and the measured q-axis current isq. The d-axis voltage command value Vsdf and the q-axis voltage command value Vsqf are output to the inverter drive circuit 9 by the non-interference control operation of the non-interference control means 94 using both.
In FIG. 7, Pg is a generator output of the generator 105, and Pgrt is a generator rated output. Isu, isv, and isw are three-phase currents.

・ Mode 4 (High wind speed control mode)
Mode 4 is a control mode of point D or higher at which the wind speed U reaches the rated wind speed Urat in FIG.
In the mode 4, as shown in FIG. 8, generator output control is performed by the pitch angle control means 5 that controls the pitch angle of the blade 101.
In other words, in FIG. 8, the fixed pitch angle is kept until the control mode by the control mode switching means 1 is switched to mode 4, and when the control mode is switched to mode 4, the generator output control by the pitch angle control means 5 is controlled. Do. In the figure, the deviation between the generator rotational speed detection value ωg and the generator rotational speed target value ωf is calculated. Then, pitch angle control is performed by outputting the pitch angle target value θf calculated by the PI calculation of the deviation in the PI controller 52 to the pitch angle driving device 103 via the changeover switch 51 as the pitch angle command value θref. . In modes other than mode 4, the change-over switch 51 outputs the pitch angle fixed value θcot as the pitch angle command value θref.

  As described above, according to the embodiment, the control mode switching means 1 is provided, and the wind speed control mode is changed to the low wind speed control mode (mode 1) and the medium wind speed control mode (modes 2 and 3) by the control mode switching means 1. ) And high wind speed control mode (mode 4), and the induced voltage detection value Vdc of the generator is determined based on the detected value of wind speed Uw and the detected value Vdc of the induced voltage of the generator. When the voltage is lower than the required voltage Vf on the power usage system side, the mode is switched to the low wind speed control mode, and the boost chopper circuit configured by the boost chopper drive circuit 8, the boost switching element 108, the boost chopper time ratio control means 10, etc. Activate to increase generator voltage.

  As a result, the boost chopper circuit is operated only in the low wind speed control mode (mode 1) in which the generator voltage needs to be raised, and the generator induced voltage (necessary voltage on the power use system side) required for grid interconnection is obtained. In addition, in each of the three speed control modes in combination with the medium wind speed control mode (modes 2 and 3) and the high wind speed control mode (mode 4), stable operation at a required voltage is possible, and the number of switching elements is small. In addition, the variable speed range can be expanded with a simplified control circuit.

  Further, in the medium wind speed control mode (modes 2 and 3), the control mode switching means 1 performs the generator speed control using the inverter drive circuit 9 at a constant pitch angle of the windmill, and the high wind speed control mode (mode 4). ), The pitch angle control using the pitch angle control means 5 is performed. Therefore, in the low wind speed control mode (mode 1), the armature current of the generator (generator) 105 is generated by the boost chopper circuit. The wind turbine speed is controlled by adjusting the generator torque by adjusting, and in the middle wind speed control mode (modes 2 and 3), the generator torque is controlled by adjusting the DC link voltage by the grid-linked inverter 112. The wind turbine speed is controlled, and in the high wind speed control mode (mode 4) higher than the rated wind speed, the pitch angle is adjusted by the pitch angle control means 5 to Since controlling the speed of the wind turbine to control the torque, and can enlarge the variable speed range by hybrid three speed control mode, system interconnection becomes possible in all control modes.

  According to the present invention, the wind speed is reduced from the low wind speed range where the induced voltage of the generator is lower than the required voltage on the power usage system side with the simplified control circuit with the minimum number of switching elements. It is possible to provide an operation control method for a wind power generation system and an operation control device thereof that can expand the variable speed operation range over the entire wind speed range up to the high wind speed range.

It is an operation control apparatus control block diagram of the wind power generation system which concerns on the Example of this invention. It is a control block diagram of the control mode switching means in the embodiment. It is a characteristic diagram of the windmill output with respect to the wind speed in the said Example, and a generator rotation speed. It is a target value calculation block diagram of the generator rotation speed in the said Example. It is a calculation diagram of the output coefficient in the embodiment. It is a control block diagram of the step-up chopper circuit in the embodiment. It is a control block diagram of inverter control in the embodiment. It is a control block diagram by the pitch angle control means in the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control mode switching means 2 Generator rotation speed target value production | generation means 3 Wind speed sensor 4 Speed sensor 5 Pitch angle control means 6 DC voltage sensor 7 Current and voltage sensor 8 Boost chopper drive circuit 9 Inverter drive circuit 10 Boost chopper time ratio control means DESCRIPTION OF SYMBOLS 11 Inverter control means 100 Windmill 101 Blade 102 Rotor head 103 Pitch drive device 105 Generator 107 Converter 108 Boosting switching element 112 Inverter

Claims (5)

  An operation control method for a wind power generation system including a windmill and a generator that is directly connected to the windmill, wherein an operation mode in the operation of the windmill and the generator is determined by the wind speed of the windmill and the rotation speed of the generator. A low wind speed control mode in which the induced voltage of the machine is lower than a required voltage on the power usage system side, a high wind speed control mode in which the wind speed of the wind turbine is equal to or higher than a rated wind speed, and the wind speed in the low wind speed control mode It is divided into three speed control modes, ie, a medium wind speed control mode that is a wind speed between the rated wind speed, and a boost chopper circuit that raises the generator voltage in the low wind speed control mode is activated among the three speed control modes. In the medium wind speed control mode and the high wind speed control mode, the operation of the boost chopper circuit is stopped. .   The generator speed control using an inverter drive circuit is performed at a constant pitch angle of the wind turbine in the medium wind speed control mode, and the pitch angle control using pitch angle control means is performed in the high wind speed control mode. The operation control method of the wind power generation system of 1.   In the medium wind speed control mode, the first intermediate wind speed control mode in the wind speed range until the generator rotational speed reaches the upper limit rotational speed through the low wind speed control mode and the generator rotational speed is the upper limit rotational speed. 2. The operation control method for a wind power generation system according to claim 1, wherein the operation is performed in a second medium wind speed control mode in a wind speed range in which the wind speed is equal to or lower than the rated wind speed.   An operation control device for a wind power generation system comprising a windmill and a generator directly connected to the windmill, wherein a detected value of a wind speed of the windmill and a detected value of an induced voltage of the generator are input, and the induction of the generator When the detected voltage value is lower than the required voltage on the power usage system side, the low wind speed control mode is set.When the detected wind speed value exceeds the rated wind speed, the detected wind speed value is set to the high wind speed control mode. Control mode switching means for switching to the medium wind speed control mode when the wind speed is in the middle wind speed region between the wind speed in the wind speed control mode and the rated wind speed, respectively, is provided when the low wind speed control mode is switched. An operation control device for a wind power generation system configured to operate a step-up chopper circuit for increasing a generator voltage. The control mode switching means operates a generator speed control by operating an inverter drive circuit at a constant wind turbine pitch angle when the medium wind speed control mode is switched, and a pitch using the pitch angle control means when the high wind speed control mode is switched. The operation control device for a wind power generation system according to claim 4, wherein the operation control device is configured to perform angle control.

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