JP6506664B2 - Wind power generation system or control method of wind power generation system - Google Patents

Description

  The present invention relates to a wind power generation system or a control method for a wind power generation system, and more particularly to a vibration control device such as a tower.

  In recent years, there is concern about global warming due to the emission of carbon dioxide and the exhaustion of fossil fuels, and it is required to reduce the emission of carbon dioxide and to reduce the degree of dependence on fossil fuels. To realize these, it is possible to generate electricity without using carbon dioxide and without using fossil fuel, and introducing a power generation system that can use renewable energy such as wind power and solar power. Is valid.

  Among the power generation systems using renewable energy, the wind power generation system is attracting attention as a relatively stable power generation system because it does not receive changes in day and night output due to solar radiation, unlike a solar power generation system. In addition, a wind power generation system installed on the ocean where the wind speed is high and the wind speed change is small compared to the ground is also attracting attention as a powerful power generation system.

  In order to utilize a wind power generation system and supply electric power stably, the technique which reduces the vibration which generate | occur | produces in the blade which comprises a wind power generation system, a tower, and a drive train is required. In particular, vibration of the tower, which is the structure that supports the entire system, can lead to vibrations to the components.

  Here, there is a tower vibration control means disclosed, for example, in Patent Document 1 as a device in consideration of the reduction of the vibration generated in the tower of the wind power generation system. Patent Document 1 discloses “A wind power generator provided with a pitch angle control mechanism for controlling a pitch angle of a wind turbine blade based on a blade pitch angle command, which is attached to a nacelle and detects acceleration of vibration of the nacelle A pitch angle of the external wind turbine blade for causing the wind turbine blade to generate a thrust force so as to cancel the vibration of the nacelle based on the acceleration and the acceleration detected by the accelerometer and calculating a blade pitch angle There is disclosed a "wind generator" having active damping means outputting to an angle control mechanism.

  By applying the technology described in Patent Document 1, the pitch angle of the blade is adjusted based on the acceleration measured by the accelerometer installed in the nacelle, and the thrust force that the wind power generation system receives from the wind is controlled. , Tower vibration can be reduced.

WO 05/83266

  In order to control the generated power output from the wind power generation system, a controller provided in the wind power generation system adjusts the pitch angle of the blades and the like. Control of the generated power is generally called variable speed control. In Patent Document 1, vibration control is performed based on the acceleration of vibration of the nacelle as described above. On the other hand, if variable speed control is performed, the blade pitch angle is constantly adjusted to keep the generator rotational speed constant at wind speeds above the wind speed (rated wind speed) at which generated power is rated. The power changes from time to time. Therefore, it is desirable to perform tower vibration control so as to cope with such thrust force changes.

  Moreover, even if the wind speed is lower than the rated wind speed, for example, when the wind speed is reduced after being rated output, the control characteristic of the tower vibration control means matches the characteristic of the vibration actually occurring. There is also no case. In this case, even if control is performed based on the acceleration of vibration of a nacelle or the like, it may take time to reduce tower vibration.

  An object of the present invention is to provide a wind power generation system or a control method of a wind power generation system capable of performing control in accordance with the characteristics of tower vibration.

In order to solve the above problems, a wind power generation system according to the present invention is a variable speed controllable wind power generation system, comprising: a blade that rotates in response to wind; a tower that supports the load of the blade; And a controller configured to adjust a pitch angle target value to be sent to the adjusting device, and an adjusting device configured to adjust the pitch angle of the blade based on the pitch angle target value. A tower vibration control means is provided, and the pitch angle target value is determined using an adjustment width for controlling the vibration of the tower determined by the tower vibration control means, and the adjustment width is the value of the generator If is determined based on the generated power, the control device includes a greater than the first power, wherein the generated power is obtained by subtracting a predetermined value from the rated output smaller than the first power Characterized by Rukoto with different size of the adjustment range.

A control method of a wind power generation system according to the present invention includes: a blade rotating in response to wind, a tower supporting a load of the blade, a generator generating power using a rotational force of the blade, and a pitch angle target value A control method of a wind power generation system capable of variable speed control, comprising: an adjustment device for adjusting a pitch angle of the blade based on the control method, wherein the pitch angle target value is determined using an adjustment width for controlling the vibration of the tower The adjustment range is determined based on the generated power of the generator , and the generated power is larger than a first power obtained by subtracting a predetermined value from a rated output, and smaller than the first power. It is characterized in that the size of the adjustment range is made different .

  According to the present invention, it is possible to provide a wind power generation system or a control method of a wind power generation system capable of performing control in accordance with the characteristics of tower vibration.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the structure outline of the wind power generation system 1 which concerns on an Example. Schematic which shows the relationship of the generated electric power in the wind power generation system 1 which concerns on the Example of this invention, a generator rotational speed, a generator torque, and a pitch angle. The block diagram which shows the processing outline of the wind power generation system control means 101 mounted in the controller 9 of the wind power generation system 1 in the Example of this invention. Schematic which shows an example of the relationship between the generated power which concerns on the Example of this invention, and the absolute value of the pitch angle adjustment range by a tower vibration control means. The schematic which shows the relationship of the generated electric power in the wind power generation system 1, the generator rotational speed, the generator torque, and the pitch angle in the conditions which restricted the generated electric power which concerns on an Example. Schematic which shows an example of the relationship between the generated electric power and the absolute value of the pitch angle adjustment range by a tower vibration control means in the conditions which restricted the generated electric power which concerns on the Example of this invention. Schematic which shows an example of the relationship of the fluctuation range of the generated power with respect to the wind speed which concerns on the Example of this invention. The adjustment means based on the generated electric power which concerns on the Example of this invention, and the schematic which shows an example which outputs the control gain of a tower vibration control means. The adjustment means based on the generated electric power which concerns on the Example of this invention, and the schematic which shows an example which outputs the natural frequency of a tower vibration control means. The adjustment means based on the generated power which concerns on the Example of this invention, and the schematic which shows an example which outputs the control gain and natural frequency of a tower vibration control means. The flowchart which shows the processing outline of the wind power generation system control means 101 which concerns on the Example of this invention. Schematic which shows the structure outline | summary in case the wind power generation system 1 which concerns on this invention is equipped with the floating body structure. Schematic which shows an example of the effect of the wind power generation system control means 101 which concerns on this invention.

  Hereinafter, embodiments of the present invention will be specifically described using the drawings. The following is an example to the last, and the embodiment of the present invention is not intended to be limited to the following example.

  First, the schematic configuration and the like of the wind power generation system will be described using FIGS. 1 and 2. First, a schematic configuration of the entire wind power generation system according to the embodiment will be described with reference to FIG.

  The wind power generation system 1 of FIG. 1 includes a rotor 4 configured of a plurality of blades 2 and a hub 3 connecting the plurality of blades 2. The rotor 4 is connected to the nacelle 5 via a rotation shaft (not shown in FIG. 1), and the position of the blade 2 can be changed by rotation. The nacelle 5 rotatably supports the rotor 4. The nacelle 5 is provided with a generator 6 at an appropriate position. The blade 2 is rotated by receiving a wind, and power can be generated by rotating the generator 6 using the rotational force.

  Each of the blades 2 is provided with a pitch actuator 7 capable of changing the positional relationship between the blade 2 and the hub 3, that is, the angle of the blade called a pitch angle, which is not shown in the figure. By changing the pitch angle of the blades 2 using the pitch actuator 7, the rotational energy of the rotor 4 with respect to the wind can be changed. A pitch angle target value is sent from the controller 9 to the pitch actuator 7, and the pitch actuator 7 adjusts the pitch angle based on the sent pitch angle target value. Thereby, the generated power of the wind power generation system 1 can be controlled while controlling the rotational speed of the rotor 4 in a wide wind speed region.

  In the wind power generation system 1 of FIG. 1, the nacelle 5 is installed on the tower 8 and rotatably supported with respect to the tower 8. The load of the blade 2 is supported by the tower 8 via the hub 3 and the nacelle 5. The tower 7 is installed at a base (not shown) and installed at a predetermined position such as on the ground or the ocean.

  The wind power generation system 1 also includes a controller 9 (control device), and the nacelle inclination information measurement sensor 10 that measures the inclination angle and inclination acceleration of the nacelle 5 from the horizontal surface, and the wind speed sensor that measures the wind speed near the nacelle 5 (Not shown) The controller 9 adjusts the generator 6 and the pitch actuator 7 based on a rotation sensor (not shown) that measures the rotational speed of the generator, thereby adjusting the power output by the wind turbine 1 Do.

  Although not shown in the drawings, a wind direction sensor for measuring the wind direction, a power sensor for measuring the active power output from the generator, and the like are provided at appropriate positions.

  Although the controller 9 is illustrated in FIG. 1 as being installed outside the nacelle 5 or the tower 8, the present invention is not limited to this. The controller 9 is not limited to this. It may be installed outside the power generation system 1.

  Here, the power generation operation outline of the wind power generation system 1 will be described with reference to FIG. FIG. 2 is a schematic diagram showing the relationship between the generated power, the generator rotational speed, the generator torque, and the pitch angle with respect to the wind speed. The horizontal axis in FIG. 2 indicates the wind speed, and the upper side of the vertical axis indicates that the generated power is high in order from the top, the generator rotational speed is high, the generator torque is high, and the pitch angle is on the feather side. Show.

First, focusing on the generated power P, changes the generated power in the range from the cut-in wind speed v _in to the cut-out wind speed v _out but increases the generated power P with the increase of the wind speed v up to the rated wind speed v _d The power generation output P is constant from _vd to the cut-out wind speed _vout .

  In order to operate according to the characteristics of the generated power P with respect to the wind speed v, the controller 9 adjusts the generator rotational speed ω, the generator torque Q, and the pitch angle Θ of the blade 2 as follows.

Controller 9 to the generator rotation speed omega, the cut-in wind velocity v _in to wind v _a is held in a synchronous rotational speed omega _low, from wind speed v _a to wind v _b increases with wind velocity v, wind velocity v _b The _motor is held at the rated rotational speed ω _rated from the cutoff speed V _out . Also, the controller 9 cuts the generator torque Q from the cut-in wind speed v _in to the rated wind speed v _d increases to the rated torque Q _rated according to the increase of the wind speed v, and from the rated wind speed v _d to the cut-out wind speed v _out the rated torque Q Hold at _rated . In order to adjust the generator rotational speed ω and the generator torque Q as described above, the controller 9 cuts the pitch angle Θ of the blade 2 to adjust the wind energy received by the rotor 4 from the wind speed v _in to the wind speed v _c The pitch angle Θ is increased with the increase of the wind speed v from the wind speed v _c to the cut-out wind speed v _out by keeping the pitch angle on the fine side until the wind speed v _out .

  The embodiment relates to a tower vibration control means for reducing longitudinal vibration (hereinafter, tower vibration) generated in the nacelle 5 (or tower 8) during the power generation operation of the wind turbine 1 shown in FIG. Thus, by providing the function of adjusting the wind power generation system control means 1 based on the generated power, it is possible to appropriately reduce the tower vibration without exciting the tower vibration. It is also possible to use with other approaches of tower vibration control.

  The wind power generation system control means 101 according to the embodiment will be described below with reference to FIGS. 3 to 15.

  FIG. 3 is a block diagram showing a processing outline of the wind power generation system 101 mounted on the controller 9 of the wind power generation system 1 in the embodiment of the present invention. The wind power generation system 101 according to the embodiment of the present invention includes variable speed control means 301, adjustment means 302 based on generated power, tower vibration control means 303, and an adder 304.

The variable speed control means 301 determines the generator torque target value Q * and the pitch angle adjustment range Θ * _VSC by the variable speed control means based on the generator rotational speed ω. The variable speed control means 301 determines the generator torque target value Q * and the pitch angle adjustment range VS * _VSC by the variable speed control means so as to realize the operation characteristic of the wind turbine 1 shown in FIG.

  The adjustment unit 302 based on the generated power determines the adjustment parameter of the tower vibration control unit 303 based on the generated power P. A specific example of the adjustment unit 302 based on the generated power will be described later.

The tower vibration control means 303 determines a pitch angle adjustment range Θ ^* _TVC by tower vibration control based on the tower vibration information. A pitch angle target value is determined using this pitch angle adjustment range Θ ^* _TVC . As a method of using the adjustment range, in addition to the case where the pitch angle target value is determined directly based on the adjustment range itself, a method of using it for comparison with other limit values or the like may be considered. In the present embodiment, the pitch angle adjustment range Θ ^* _TVC is determined based on the generated power of the generator 6.

The adding unit 304 adds the pitch angle adjustment range Θ * _VSC by the variable speed control means 301 and the pitch angle adjustment range Θ * _TVC by the tower vibration control means to determine a pitch angle target value Θ *. In this embodiment, it is assumed that the pitch angle target value Θ * matches the command value transmitted to the pitch actuator 7. However, the present invention is not limited to this, and a process of adding the previous value of the pitch angle target value Θ * Or to transmit the velocity of the pitch angle target value Θ * to the pitch actuator 7.

  The adjustment of the blade pitch angle by variable speed control that controls the rotational speed of the rotor 4 and the generator torque to control the generated power may increase the inherent tower vibration that the wind power generation system has as a structural characteristic. In particular, it becomes remarkable in a floating wind power generation system. Since the floating wind power generation system is not fixed to the ground or the seabed, the tower attitude is likely to change.

  Adjustment of the blade pitch angle to maintain the generator rotational speed by variable speed control may excite tower vibration by changing the thrust force applied to the rotor. This is called a negative damping phenomenon. Tower vibration due to this negative damping phenomenon occurs under operating conditions where the generated power reaches the rated output and the variable speed control adjusts the blade pitch angle adjustment to the feather side so as to maintain the generator rotational speed. On the other hand, it does not occur under the operating conditions below the rated output which is maintained at the fine pitch angle without adjusting the blade pitch angle. In addition, adjustment of the blade pitch angle by variable speed control is implemented not according to the wind speed but according to the measured value of a generator rotational speed and generated electric power. From these facts, it is shown that the above-mentioned tower vibration characteristic has a property of changing based on the generated power. Therefore, it is desirable to perform tower vibration control based on the generated power.

  It is not impossible to suppress the above-mentioned negative damping phenomenon by applying vibration control means based on the acceleration of a nacelle or the like. However, since only the means concerned does not have the technology related to the characteristic change of the tower vibration control means based on the generated power, the convergence time of the tower vibration is prolonged by the change of the tower vibration characteristic according to the generated power described above. There is. As described in the present embodiment, it is possible to effectively focus the tower vibration by changing the characteristics of the tower vibration control means based on the generated power.

  In addition, it is assumed that after the generated power is rated output, the wind speed is lowered to change the rated output or less. When generated power is rated output, tower vibration control means adapted to tower vibration characteristics can reduce tower vibration, but when the generated power changes to less than the rated value, the tower vibration control means has characteristics , May not match the generated tower vibration characteristics. As a result, the adjustment of the blade pitch angle based on the acceleration or the like of the tower vibration does not operate properly, which may require time for the convergence of the tower vibration. Therefore, it is desirable to perform tower vibration control based on the generated power also in the area below the rated wind speed.

  As a preferable application of this embodiment, the application of the tower vibration control means whose characteristics change based on the generated power has a range in which negative damping occurs. Since negative damping occurs at the rated output or at a slightly reduced output from the rated output, it is possible to change the characteristics of the tower vibration control means under the operating conditions near the rated output and the operating conditions where the generated power is smaller than the rated output. preferable. However, the present invention itself can be applied to an output where negative damping does not occur, and even in that case, a certain effect can be expected.

4, after reflecting the adjustment parameters of the tower vibration control unit 303 by adjusting means 302 based on the generated power, the generated power and by the tower vibrations control tower vibration control unit 303 determines the pitch angle adjustment width theta ^* _TVC It is the schematic which shows an example of relationship. FIG. 4 shows the absolute value | Θ ^* _TVC | of the pitch angle adjustment range by the tower vibration control means when the tower inclination angle, which is an example of tower vibration information, is held at a predetermined value. The tower vibration information is not limited to the tower inclination angle, and for example, acceleration of a tower or a nacelle can also be used.

By reflecting the adjustment parameter of the tower vibration control means by the adjustment means 302 based on the generated power, the tower vibration control means 303 is in the range from the rated output P _rated to P ₁ having a range of a predetermined value ΔP. Increases the absolute value | Θ ^* _TVC | of the pitch angle adjustment range by the tower vibration control means. On the other hand, when the generated power P is smaller than P ₂ (more P ₂ is smaller than P ₁ ) smaller than the rated output P _rated , the absolute value of the pitch angle adjustment range by the tower vibration control means | Θ ^* _TVC | Make The absolute value of the pitch angle adjustment width between the generated power P ₁ and P ₂ | theta ^* _TVC | sudden change to suppress the absolute value of the pitch angle adjustment width between the generated power P ₁ and P ₂ | 補 間^* _TVC | interpolates smoothly according to the change of the generated power P. Also, interpolation between the generated power P ₁ and P _2, linear and not, may be a curve interpolation forms such quadratic function.

A specific operation example of the adjustment unit 302 based on the generated power is as follows. In the range range of P ₁ having a predetermined value ΔP generated power from the rated output P _rated, negative damping phenomenon occurs by the operation of the pitch angle by the variable speed control described above, it may tower oscillations is expanded is there. Therefore, in order to provide a component that reduces tower vibration to the pitch angle adjustment width of variable speed control, the absolute value | た_めに^* _TVC | of the pitch angle adjustment width by the tower vibration control means is increased.

On the other hand, if the generated power is less than P _{2 (} less than P ₁ ) smaller than the rated output P _rated , the above negative damping phenomenon does not occur because the pitch angle is not adjusted by the variable speed control. However, negative vibration may cause tower vibration under operating conditions in the range of rated output P _rated to P ₁ with a range of ΔP, and may continue even after the generated power decreases, or If the wind and wave fluctuations coincide with the above-mentioned tower natural vibration, tower vibration may occur. The tower vibration characteristic in this case is different from the characteristic that the tower vibration expands and continues like the above-mentioned negative damping phenomenon, and the tower vibration can be reduced even if the pitch angle adjustment range based on the tower vibration is small . Therefore, if the generated power P is P ₂ or smaller than the rated output P _rated or P ₁ , the absolute value of the pitch angle adjustment range by the tower vibration control means is | Θ ^* _TVC |, and the generated power is the rated output P _rated to ΔP. The value of P ₁ is smaller than the value of P ₁ which has a range of. That controller 9, the generated power of the generator 6 when the case is greater than P ₁ minus a predetermined value ΔP from the rated output smaller than P _1, and with different sizes of pitch angle adjustment range . However, it does not exclude the thing which makes generated electric power P the absolute value | P ^* _TVC | of the pitch angle adjustment range near the rated output smaller than that of generated electric power P ₂ or less.

  FIG. 5 is a diagram showing an operation outline when the rated output of the wind power generation system 1 is limited. The horizontal axis in FIG. 5 indicates the wind speed, and the upper side of the vertical axis indicates that the generated power is high in order from the top, the generator rotational speed is high, the generator torque is high, and the pitch angle is on the feather side. Show. The dotted line in FIG. 5 shows the case without the generated power restriction shown in FIG. 2, and the solid line shows the case with the generated power restriction.

To the case of no electric power generation limit shown by a dotted line, in the case where there is a solid line in electric power generation limit, and restricted to operate below the wind speed v generated power which can be generated by _e P _res, power generation or more wind velocity v _e Hold the power at _Pres . The generator rotational speed and the generator torque are limited to ω _res and Q _res , respectively, in accordance with the generated power limitation. In addition, according to the generated power restriction, the pitch angle is operated to the feather side at the wind speed v _e or more.

6, the absolute value of the pitch angle adjustment range by the generated power and a tower vibration control unit With a restricted generated power shown in FIG. 5 | is a schematic diagram showing an example of a relationship | Θ ^* _TVC. (Maximum) of the generated power in accordance with the fact of limiting the power limit P _res is below the rated output from the rated output P _rated, by the tower vibration control means between P ₃ obtained by subtracting a predetermined value ΔP from the generated power P _res The absolute value of the pitch angle adjustment range | Θ ^* _TVC | and the absolute value of the pitch angle adjustment range by the tower vibration control means between the generated powers P ₄ (<P ₃ ) and P ₃ | Θ ^* _TVC | The sizes are different.

  FIG. 7 is a schematic view showing an example of the relationship between ΔP and the wind speed shown in FIGS. 4 and 6. The horizontal axis of FIG. 7 indicates the wind speed, and the vertical axis indicates the generated power. The solid line in FIG. 7 indicates the steady-state characteristic, and the broken line indicates the fluctuation range of the generated power in the sequential operation. As shown in FIG. 7, .DELTA.P shown in FIG. 4 and FIG. 6 is about a half of the fluctuation range of the generated power when generating at a rated rotational speed or higher.

However, the invention is not limited to this, and ΔP may be half or less of the fluctuation range of the generated power, or may have a value as large as about three times, as shown in FIG. The absolute value | Θ ^* _TVC | of the pitch angle adjustment range by the tower vibration control means shown in FIG. 6 has a characteristic that is changed based on ΔP. In the above description of FIGS. 4 to 7, although the same predetermined value .DELTA.P has been described, different values may be used because the operating conditions of both are different. Specifically, assuming that ΔP in FIG. 4 is ΔP ₁ and ΔP in FIG. 6 is ΔP ₂ , ΔP ₁ ΔΔP ₂ may be used. These predetermined values should be able to cover the fluctuation range of the generated power at the time of operation. Specifically, the rated wind speed v _d and the wind speed v _e higher than itself after limitation With respect to the threshold wind speed such as v _e which holds the generator torque constant, each predetermined speed such as ΔP ₁ or ΔP ₂ The value can be determined in consideration of the variation of the generated power above the corresponding threshold wind speed. The necessity of taking into consideration the variation of the generated power can be explained as follows. That is, since the measured value (sensor output) of the generator rotational speed, which is an input of the variable speed control, and the output value (actual value) of the generator torque include variations, the generated power fluctuates even during rated operation etc. . Further, according to the method shown in the present embodiment, the generated power is used also for grasping the current operating conditions (such as whether or not the negative damping phenomenon occurs), but this measured value also includes the variation. Therefore, it is desirable to consider the variation in generated power also in order to accurately determine the operating conditions.

8 to 10 are diagrams showing specific examples of the adjustment unit 302 based on the generated power. FIG. 8 shows a case where the adjustment means 302 based on the generated power adjusts the control gain G _TVC of the tower vibration control means based on the generated power. Although this is not specified in the figure, this is an example in the case where the transfer characteristic for determining the pitch angle target value of the tower vibration control means 303 has a control gain G _TVC . The control gain G _TVC may be capable of changing the entire gain of the transfer characteristic of the tower vibration control means 303, or may be capable of changing only a part. The controller 9 changes the pitch angle adjustment range by adjusting the gain for adjusting the transfer characteristic of the tower vibration control means 303.

FIG. 9 shows a case where the adjustment means 302 based on the generated power adjusts the natural frequency ω _TVC of the tower vibration control means based on the generated power. This is an example not shown in the figure, but is an example in the case where the transfer characteristic for determining the pitch angle target value of the tower vibration control means 303 has a natural frequency ω _TVC such as a digital filter. The digital filter may be a band pass filter that extracts a specific frequency component from a tower tilt angle, which is an example of tower vibration information, or may be a combination with a transfer characteristic that adjusts other phase characteristics.

FIG. 10 shows a case where the adjustment means 302 based on the generated power adjusts the control gain G _TVC of the tower vibration control means and the natural frequency ω _TVC of the tower vibration control means based on the generated power. Although not shown in the figure, in the same manner as described above, this is an example of the case where the transmission characteristics of the tower vibration control means 302 have characteristics of natural frequency ω _TVC such as control gain G _TVC and digital filter. In the controller 9, the adjustment range is changed by adjusting the natural frequency ω _TVC of the filter characteristic. However, the invention is not limited to this, and adjustment parameters other than the natural frequency ω _TVC such as the control gain G _TVC and the digital filter may be determined.

FIG. 11 is a flowchart showing an outline of processing of the control means 101 of the wind power generation system according to the embodiment of the present invention. In step S1101, the generator rotational speed ω is determined, and the process proceeds to the next step. In step S1102, the pitch angle adjustment means 301 by the variable speed control means determines the pitch angle adjustment range Θ * _VSC by the variable speed control means, and the process proceeds to the next step. In step S1103, tower vibration information is determined, and the process proceeds to the next step. In step S1104, after the adjustment parameter is determined by the adjustment unit 302 based on the generated power, the tower vibration control unit 303 determines the pitch angle adjustment range と * _TVC by the tower vibration control unit based on the tower vibration information and the adjustment parameter. Decide and proceed to the next step. In step S1105, the adding unit 304 adds the pitch angle adjustment range Θ * _VSC by the variable speed control means 301 and the pitch angle adjustment range Θ * _TVC by the tower vibration control means to determine the pitch angle target value Θ * , End a series of processing.

  The scope of the present invention is not limited to the above. Specifically, the wind power generation system 1 shown in FIG. 1 does not specify the installation mode, but may be a landing type wind power generation system installed on the ground or the seabed. Moreover, as shown in FIG. 12, you may provide the structure installed on the floating body structure 11 floated on the ocean.

  FIG. 13 is a schematic view showing the effect of the wind power generation system control means 101 according to the embodiment of the present invention. The horizontal axis in FIG. 13 represents time, and the vertical axis represents the wind speed, the generated power, and the tower inclination angle which is an example of tower inclination information from the upper side of the drawing. The upper side of the figure shows, from top to bottom, that the wind speed is high, the generated power is high, and the tower tilt angle is aft, respectively. In FIG. 13, the dotted line shows an example of response when the embodiment of the present invention is not applied, and the solid line shows an example of response when the present invention is applied.

Figure 13 is a wind velocity shown at the top is lower than time t _2, the at time t ₃ is the case where changes to the state of being smaller than the rated output v _d. With the change of the wind speed, the generated power shown in the middle stage of FIG. 13 falls from P _rated . Since the characteristics of the tower tilt angle change according to the changes in the wind speed and the generated power, the vibration of the tower tilt angle does not diverge when the contents according to the present embodiment are not applied, but time t ₃ After that, tower vibration may continue. In contrast, by applying the contents of the present embodiment, based on the generated power by adjusting the characteristics of the tower vibration control means, the tower vibrations at time t ₃ after can be converged in a short period of time . In the above example, the vibration reduction of the tower etc. is mainly explained based on the tower inclination angle, but it is also possible to apply other tower vibration reduction methods together, for example, for acceleration of nacelle or tower. It is possible to apply to the tower vibration reduction method based on.

1: Wind power generation system 2: Blade 3: Hub 4: Rotor 5: Nacell 6: Generator 7: Pitch actuator 8: Tower 9: Controller 10: Tower inclination information measurement sensor 11: Floating structure

Claims (13)

A variable speed controllable wind power generation system,
A blade that rotates in response to the wind,
A tower for supporting the load of the blade;
A generator that generates electricity using the rotational force of the blade;
An adjusting device for adjusting the pitch angle of the blade based on a pitch angle target value;
A control device for determining a pitch angle target value to be sent to the adjustment device;
The control device has a tower vibration control means, and determines the pitch angle target value using an adjustment width for controlling the vibration of the tower determined by the tower vibration control means,
The adjustment range is determined based on the power generated by the generator ,
Wherein the control device, wherein a case where the generated power is greater than the first power obtained by subtracting the predetermined value from the rated output, if less than the first power, the Rukoto with different size of the adjustment range Wind power generation system. The wind power generation system according to claim 1 ,
When the output of the generator is limited to the limit power equal to or less than the rated output, the control device is configured to generate the second power when the generated power is larger than a second power obtained by subtracting a predetermined value from the limit power. A wind power generation system, wherein the size of the adjustment range is made different when the power is smaller. The wind power generation system according to claim 1 or 2 , wherein
The controller controls the generator torque to be held at a wind speed higher than a threshold wind speed,
The wind power generation system according to claim 1, wherein each of the predetermined values is determined in consideration of a variation in generated power above the threshold wind speed. The wind power generation system according to claim 3 ,
The wind power generation system, wherein the predetermined value is approximately one half of a fluctuation range of the generated power when generating power at the threshold wind speed or more. The wind power generation system according to any one of claims 1 to 4 , wherein
The said control apparatus changes the said adjustment range by adjusting the gain which adjusts the transfer characteristic which the said tower vibration control means has, The wind power generation system characterized by the above-mentioned. The wind power generation system according to any one of claims 1 to 5 , wherein
When the transfer characteristic of the tower vibration control means has a filter characteristic for extracting a frequency component of the input value of the transfer characteristic,
The said control apparatus changes the said adjustment range by adjusting the natural frequency of the said filter characteristic, The wind power generation system characterized by the above-mentioned. The wind power generation system according to any one of claims 1 to 6 , further comprising a floating body structure for supporting the load of the tower. A blade that rotates in response to the wind,
A tower for supporting the load of the blade;
A control method of a wind power generation system capable of variable speed control, comprising: a generator that generates electric power using the rotational force of the blade; and an adjustment device that adjusts the pitch angle of the blade based on a pitch angle target value,
The pitch angle target value is determined using an adjustment width that controls the vibration of the tower,
The adjustment range is determined based on the power generated by the generator ,
The size of the adjustment range is made different between when the generated power is larger than a first power obtained by subtracting a predetermined value from a rated output and when it is smaller than the first power . Control method. The control method of the wind power generation system according to claim 8 ,
When the output of the generator is limited to the limit power equal to or less than the rated output, the generated power is larger than the second power obtained by subtracting a predetermined value from the limit power, and smaller than the second power The control method of the wind power generation system, wherein the size of the adjustment range is made different. The control method of the wind power generation system according to claim 8 or 9 ,
At wind speeds above the threshold speed, control is performed to maintain the generator torque,
A control method of a wind power generation system, characterized in that each of the predetermined values is determined in consideration of a variation in generated power at or above the threshold wind speed. The control method of the wind power generation system according to claim 10 , wherein
The control method of the wind power generation system, wherein the predetermined value is approximately one half of a fluctuation range of the generated power at the time of generating power at the threshold wind speed or more. The control method of the wind power generation system according to any one of claims 8 to 11 ,
A control method of a wind power generation system, wherein the adjustment range is changed by adjusting a gain for adjusting a transfer characteristic of the tower vibration control means. The control method of the wind power generation system according to any one of claims 8 to 12 , wherein
When the transfer characteristic of the tower vibration control means has a filter characteristic for extracting a frequency component of the input value of the transfer characteristic,
A control method of a wind power generation system, wherein the adjustment range is changed by adjusting the natural frequency of the filter characteristic.

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