JP6457783B2 - Wind power generator - Google Patents

Description

  The present invention relates to a wind power generator capable of converting wind power into electric power energy, and considers a sudden load change in a tower shadow.

  In recent years, there are concerns about global warming due to carbon dioxide emissions and the depletion of fossil fuels, and there is a demand for a reduction in carbon dioxide emissions and a decrease in dependence on fossil fuels. In order to reduce carbon dioxide emissions and reduce dependence on fossil fuels, it is effective to introduce a power generation system that uses renewable energy obtained from nature such as wind and sunlight. 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 direct output change due to solar radiation unlike the solar power generation system. In addition, wind power generation systems installed on the ocean with higher wind speed and less change in wind speed compared to the ground have attracted attention as a powerful power generation system.

  Here, for example, a technique disclosed in Japanese Patent Application Laid-Open No. 2004-133620 is considered in consideration of reduction of load fluctuations generated in the blade. Japanese Patent Application Laid-Open No. 2004-151867 discloses a storage unit that stores predetermined parameters, azimuth angles, and pitch angle command values that affect blade load fluctuations, and an azimuth angle that detects an azimuth angle for each blade. A detection means; a parameter detection means for detecting a predetermined parameter; and a command value acquisition means for acquiring a pitch angle command value selected by the predetermined parameter detected by the azimuth angle detection means from the storage means for each blade. The pitch angle control command value for controlling the blade pitch angle based on the pitch angle command value acquired by the command value acquisition means and the common pitch angle command value common to each blade obtained from the output information of the wind turbine generator A pitch angle control command value generating means for generating Redopitchi angle control device, is disclosed. Further, a technique is disclosed in which the wind angle characteristics at the installation location of the wind turbine generator are reflected in the pitch angle command value stored in the storage means. In particular, the final pitch angle control command value is determined using a pitch angle command value stored in advance in order to reduce blade load fluctuation caused by a wind speed difference in the vertical direction (hereinafter referred to as wind shear characteristics). . More specifically, by adjusting the pitch angle toward the feather side at the azimuth angle where the blade is located above the nacelle, the load on the blade in the high wind speed region is reduced, and the blade is located below the nacelle. By adjusting the pitch angle toward the fine side at the azimuth angle, the load applied to the blade in the region where the wind speed is low is increased.

JP 2005-83308 A

  In constructing the wind power generation system, it is necessary to reduce the load fluctuation of the blades constituting the wind power generation system. In particular, when the azimuth angle of the blade is located in the vicinity of the tower, it is necessary to reduce the sudden change in blade load and the drive train load caused by the decrease in wind speed caused by the tower (hereinafter referred to as tower shadow characteristics). is there. When the load variation of the blade is large, the blade may vibrate. In order to increase the reliability of the equipment, it can be said that it is preferable to take measures against load fluctuations. An object of the present invention is to provide a highly reliable wind power generator.

In order to solve the above-described problems, a wind turbine generator according to the present invention includes a blade that rotates by receiving wind, a tower that supports a load of the blade, and a sensor, and is capable of adjusting the pitch angle of the blade. Then, the pitch angle when the blade is positioned on the tower shadow of the tower is adjusted to the feather side, and at least one of the blade displacement amount, blade load, tower inclination angle, and tower load that is the output of the sensor. And a range for adjusting the pitch angle in accordance with the azimuth angle of the blade is determined, the pitch angle correction maximum value is determined by the output of the sensor provided in the blade base, the blade load of the blade base, The blade load of the blade base at the azimuth angle affected by the tower shadow, and the tower shad Characterized in that said determined in proportion to the difference between the blade load of the blade base in the azimuth angle effect is not of.

  According to the present invention, it is possible to provide a highly reliable wind power generator.

It is a schematic block diagram of the wind power generator concerning an example. It is a figure in the comparative example which shows the blade pitch angle with respect to an azimuth angle, the load of a blade base, and the load change of a blade base. It is a figure which shows the azimuth angle of each braid | blade. It is a block diagram which shows the control method of the wind power generator which concerns on an Example. It is Example explanatory drawing at the time of applying the method of reducing the load fluctuation of the blade by a tower shadow (corresponding to FIG. 2 of the comparative example). It is Example explanatory drawing at the time of applying the method of reducing the load variation of the blade by a tower shadow, and the method of suppressing the fall of electric power generation output. FIG. 6 is an explanatory diagram of an embodiment in which a stop period is provided in a pitch angle adjustment period in a method of reducing blade load fluctuation due to a tower shadow. It is explanatory drawing of the Example which does not provide a stop period in the adjustment period of a pitch angle in the method of reducing the load variation of the blade by a tower shadow. It is a figure which shows the relationship of the pitch angle adjustment start azimuth angle and completion | finish azimuth angle, and angle between blades in an Example. It is a figure which shows the relationship of the azimuth angle of the pitch position adjustment start azimuth angle and end azimuth angle, and tower position in an Example. It is a figure which shows the relationship between the azimuth angle of the intermediate | middle of the pitch angle adjustment start azimuth angle and end azimuth angle in an Example, and the azimuth angle of a tower position. 1 is a schematic view of an upwind wind power generator. FIG. It is a schematic diagram of a wind power generator of a downwind system. It is a figure which shows the control flow of the wind power generator which concerns on an Example.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. The following are only examples, and the embodiments of the present invention are not intended to be limited to the following examples.

<< Schematic Configuration of Embodiment of the Present Application >>
First, the schematic configuration of the first embodiment of the wind turbine generator according to the present application will be described with reference to FIG.

  FIG. 1 shows an overall schematic configuration of a wind turbine generator 1 of the present application. The wind turbine generator 1 described in the embodiment includes a rotor 4 including a plurality of blades 2 and a hub 3 that connects the plurality of blades 2. Although not shown in FIG. 1, the rotor 4 is connected to the nacelle 6 via a rotating shaft, and the position of the blade 2 can be changed by rotating. When the blade 2 receives wind, the rotor 4 rotates, and although not shown in the figure, for example, electric power can be generated by rotating a generator provided in the nacelle. Each blade 2 is provided with a pitch actuator 5 that can change the positional relationship between the blade 2 and the hub 3, that is, the angle of the blade called a pitch angle. By changing the pitch angle of the blade 2 using the pitch actuator 5, the rotational energy of the rotor with respect to the wind can be changed. Thereby, the electric power generated by the wind power generator 1 can be controlled while controlling the rotational speed of the rotor 4 in a wide wind speed region.

  In the present embodiment, each blade 2 includes a pitch actuator, and the pitch angle of each blade 2 can be adjusted independently. The nacelle 6 is installed on the tower 7 and is rotatably supported by the tower 7. In this embodiment, the load of the blade 2 is supported by the tower 7 through the hub 3 and the nacelle 6. The tower 7 is installed at a base (not shown in the figure), and is installed at a predetermined position on the ground or the ocean. In addition, the wind power generator 1 includes a controller 9 and adjusts the pitch actuator 5 based on the sensor output that is an output signal of the sensor 10, thereby reducing the pitch angle correction control that reduces the sudden change in the blade load caused by the tower shadow. Means 401 is implemented in the form of a program. Further, an azimuth angle detection sensor 8 for detecting an azimuth angle that is a rotation angle of the rotor 4 is provided. In FIG. 1, the controller 9 is illustrated as being installed outside the nacelle 6 or the tower 7. However, the controller 9 is not limited to this. The form installed in the exterior of the electric power generating apparatus 1 may be sufficient. Here, the tower shadow refers to an azimuth angle at which the wind speed rapidly decreases due to the influence of the tower. In the wind direction, the position that coincides with the tower is most easily affected, but the azimuth angle at which the wind speed rapidly decreases due to the influence of the tower is not necessarily limited to that position. In addition, the downwind wind power generator in which the blade passes leeward than the tower is more easily affected by the tower shadow, and the application of the present invention is preferable. However, the upwinder in which the blade passes the leeward than the tower is preferable. Even the wind power generator of the system is affected by the effect, so the effect of applying the present invention can be expected.

<< Outline of behavior of wind power generator in comparative example >>
FIG. 2 shows blade pitch angle, blade base load, and blade base load change with respect to the azimuth angle in the comparative example.

  The horizontal axis in FIG. 2 indicates the azimuth angle, and the vertical axis indicates the blade pitch angle, the load on the blade base, and the load change on the blade base from the top of the drawing, respectively. In the figure which shows the blade pitch angle with respect to an azimuth angle, it points out that a blade pitch angle goes to a feather direction as it goes upwards in the figure. In the figure which shows the load of the blade base with respect to an azimuth angle, it shows that the load of a blade base becomes large (in the direction which receives a wind) as it goes upwards in the figure. In the figure showing the load change of the blade base with respect to the azimuth angle, it is shown that the load change of the blade base becomes larger (in the direction of receiving wind) as it goes upward in the figure. In the present embodiment, the azimuth angle of the blade is 0 deg when the blade is positioned at the apex on the azimuth angle. Then, when the windmill is viewed from the windward side, the clockwise direction is a positive direction, and values determined from 0 deg to 360 deg are shown (FIG. 3). Of course, how to determine the angle is not limited to the method of this embodiment.

  In the present embodiment, as shown in FIG. 3, the wind power generator 1 includes three blades. However, regarding the pitch angle and blade load, only the blade indicated by # 1 will be described as a representative. As for # 2 and # 3, only the reference azimuth angle is different, and the basic operation is the same as that of # 1, and therefore detailed explanation is omitted.

  In the following, when the control method of the wind turbine generator 1 of the present application is not applied, the blade pitch angle and the figure are not clearly shown, but the pitch angle control is mainly considered for the variable speed control, and at least the tower shadow The characteristics are not considered. The variable speed control is not shown in the figure, but is implemented as a program of the control device 8. Furthermore, in order to simplify the discussion, a steady state with a constant wind speed is assumed.

  First, paying attention to the blade pitch angle in FIG. 2, when the wind speed is constant, the blade pitch angle is held at a constant value of θ1 regardless of the azimuth angle by the variable speed control. In that case, in the period of azimuth angle φ1 deg to φ2 deg where the wind energy received by the blade is blocked by the tower, the load on the blade base continuously decreases from L1 to L2 compared to other periods. . Finally, paying attention to the load change of the blade base, it decreases to the minimum value -dL1 in the range of azimuth angle φ1 deg to 180 deg and increases to 0. Further, it increases to the maximum value dL1 in the range of azimuth angle 180 deg to φ2 deg and then decreases to 0.

  Since the load on the blade base changes with the azimuth angle, the load change on the blade base becomes steep. As a result, vibrations are generated in the blades and the drive train. Therefore, it is necessary to enhance the structural strength in consideration of the vibrations. However, when the strength of the blades is improved, the blade weight is increased and the costs of related devices are increased.

<< Pitch angle correction means in the embodiment >>
Hereinafter, an embodiment of pitch angle correction means that is mounted on the controller 9 of the wind turbine generator 1 and slows the blade load change due to the tower shadow will be described with reference to FIGS.

  FIG. 4 is a block diagram illustrating an outline of the pitch angle correction unit 401 mounted on the controller 9 of the wind turbine generator 1 in the embodiment of the present application.

  The pitch angle correction means 401 in this embodiment includes a pitch angle correction maximum value calculation unit 402 (hereinafter also simply referred to as a correction maximum value calculation unit) and a pitch angle correction start azimuth angle calculation unit 403 (hereinafter simply referred to as correction start azimuth). A pitch angle correction end azimuth angle calculation unit 404 (hereinafter also simply referred to as a correction end azimuth angle calculation unit), and a pitch angle correction value calculation unit 405 (hereinafter simply referred to as a correction value calculation unit). Also expressed).

  The correction maximum value calculation unit 402 determines a pitch angle correction maximum value based on a sensor output that is an output signal of the sensor 10 described later. Although not explicitly shown in the figure, the maximum value in the pitch angle correction (to reduce the load change of the blade base due to the influence of the tower shadow) is determined. The method of determining the maximum value may be determined according to the wind speed, for example, and the amount of change of the blade base provided in the blade base at the azimuth angle having an influence of the tower shadow characteristic is stored. However, it may be determined in proportion to the difference of the load door of the blade base at the azimuth angle without the influence of the tower shadow.

  The correction start azimuth angle calculation unit 403 determines a pitch angle correction start azimuth angle based on the sensor output and the azimuth angle. Examples of the method for determining the correction start azimuth angle include the following methods. The azimuth angle at which the sensor output starts to change greatly is preserved in the vicinity of the tower and at the azimuth angle at which the blade moves toward the tower. Then, the pitch angle correction start azimuth angle is determined so as to reduce the azimuth angle by subtracting a predetermined value from the stored azimuth angle.

  In addition, the adjustment allowance for decreasing (azimuth angle) based on the rotor rotational speed may be changed.

  In consideration of the speed of rotation of the blade and the time required for changing the pitch angle (mechanical response speed), adjustment of the pitch angle to the feather side may be started before the blade is positioned in the tower shadow. . Thereby, when approaching a tower shadow, it is possible to adjust a pitch angle to the feather side reliably.

  The correction end azimuth angle calculation unit 404 determines the pitch angle correction end azimuth angle based on the sensor output and the azimuth angle. More specifically, the azimuth angle at which the sensor output does not change is stored at the azimuth angle in the vicinity of the tower and the blade moves away from the tower. The pitch angle correction end azimuth angle may be determined so as to increase the azimuth angle by adding a predetermined value to the stored azimuth angle, or based on the rotor rotational speed (azimuth angle). You may change the adjustment cost to enlarge.

  The correction start azimuth angle calculation unit 403 and the correction end azimuth angle calculation unit 404 determine a range in which the pitch angle is adjusted in consideration of tower shadow characteristics according to the sensor output and the azimuth angle.

  The correction value calculation unit 405 determines the pitch angle correction value based on the azimuth angle and the input values of the maximum correction value, the correction start azimuth angle, and the correction end azimuth angle that are respectively determined. More specifically, the pitch angle is operated based on the pitch angle correction maximum value in the range of the azimuth angle from the pitch angle correction start azimuth angle to the pitch angle correction end azimuth angle. The pitch angle correction value increases the pitch angle correction value toward the maximum pitch angle correction value during the correction execution period described above, and decreases the pitch angle correction value after matching the maximum pitch angle correction value.

  In the controller 9 of the wind turbine generator 1, the pitch angle correction value determined by the pitch angle correction unit 401 is added to the pitch angle command basic value (not shown) determined by variable speed control or the like via the adder 406. And add to the pitch actuator 5 as a pitch angle command value.

  FIG. 5 shows the blade pitch angle with respect to the azimuth angle, the load on the blade base, and the load change on the blade base when the pitch angle correction unit 401 according to the embodiment of the present application is applied.

  The horizontal axis of FIG. 5 shows the azimuth angle, and the vertical axis shows the blade pitch angle, the load of the blade base, and the load change of the blade base from the top of the drawing, respectively. In the figure which shows the blade pitch angle with respect to an azimuth angle, it points out that a blade pitch angle goes to a feather direction as it goes upwards in the figure. In the figure which shows the load of the blade base with respect to an azimuth angle, it shows that the load of a blade base becomes large as it goes upwards in the figure. In the figure showing the load change of the blade base with respect to the azimuth angle, it is shown that the load change of the blade base increases in the upward direction in the figure. In addition, the broken line in a figure shows the result in the comparative example shown in FIG. 2, and the solid line has shown the result when the pitch angle correction means 401 is applied.

  By applying the pitch angle correction means 401 in the embodiment of the present application, (1) after the azimuth angle φp1 deg, the pitch angle is corrected from θ1 to the feather direction, and increases to θ2 at an azimuth angle of 180 deg. (2) In the range of azimuth angle 180 deg to φp2 deg, the pitch angle is decreased from θ2 to θ1. The change speed of the pitch angle at this time can be set to the maximum pitch speed. Thereby, it is possible to reduce the area on the azimuth angle where the pitch angle is adjusted in consideration of the tower shadow characteristics, and it is possible to prevent the power generation amount from being lowered. By correcting the pitch angle as described above, the load on the blade base decreases from (1) L1 to L3, and then increases from (2) L3 to L1. At this time, L3 takes a value smaller than L2. Along with the transition of the load of the blade base described above, the change in the blade load decreases from (1) φp1 to 0 to −dL2, increases to (2) dL2, and finally decreases to 0 at φp2. Here, the change in the load of the blade base portion is reduced to dL2 from the absolute value dL1 (> dL2) which is an absolute value when the pitch angle correction unit 401 of this embodiment is not applied. By applying the angle correction means 401, it becomes possible to slow down the load change of the blade base caused by the tower shadow characteristic. The amount of load change when passing through the tower shadow is reduced by adjusting the pitch angle when the blade is positioned in the tower shadow to the feather side compared to the pitch angle when the blade is positioned outside the tower shadow. Can do. When the azimuth angle of the blade is positioned in the vicinity of the tower, a sudden change in the blade load and a sudden change in the drive train load caused by a decrease in the wind speed (tower shadow characteristic) caused by the tower are reduced. That is, the contents of the present embodiment can contribute to improving the reliability of not only the rotor but also the drive train that transmits the rotational energy of the blades to the generator side. As a member constituting the drive train, for example, there are a main shaft connected to the rotor, a speed increasing device connected to the main shaft to increase the rotation speed, or a hydraulic drive system, but of course, it is not limited to this. Absent.

  Moreover, the vibration of the blade is related to the low frequency sound during the operation of the wind power generation system, and reducing the blade vibration leads to prevention of an increase in the low frequency sound.

  Here, the correction of the pitch angle as shown in FIG. 5 operates the pitch angle to the feather side in the period of azimuth angle from 90 deg to 270 deg. Therefore, the efficiency of converting the wind energy of the blade into rotational energy decreases in this period. . In order to suppress a decrease in power generation efficiency by the pitch angle correcting means 401 of the present embodiment, as shown in FIG. 6, the pitch angle is corrected in the period from 0 deg to 90 deg and from 270 deg to 360 deg. In the following, such additional embodiments will be described.

  FIG. 6 shows blade pitch angle, blade base load, and blade base load change with respect to the azimuth angle when the pitch angle is corrected. The horizontal axis of FIG. 6 shows the azimuth angle, and the vertical axis shows the blade pitch angle, the load of the blade base, and the load change of the blade base from the top of the drawing, respectively. In the figure which shows the blade pitch angle with respect to an azimuth angle, it points out that a blade pitch angle goes to a feather direction as it goes upwards in the figure. In the figure which shows the load of the blade base with respect to an azimuth angle, it shows that the load of a blade base becomes large as it goes upwards in the figure. In the figure showing the load change of the blade base with respect to the azimuth angle, it is shown that the load change of the blade base increases in the upward direction in the figure. Also, the broken line in the figure shows the case where the pitch angle correcting unit 401 of this embodiment is not applied, and the solid line shows the result when the pitch angle correcting unit 401 of this embodiment is applied.

  The difference from the pitch angle correction means 401 of this embodiment shown by the solid line in FIG. 5 and FIG. 6 is that the pitch angle is corrected even at azimuth angles of 0 deg to 90 deg and 270 deg to 360 deg. In FIG. 6, in order to suppress a decrease in power generation output due to correction of the pitch angle in the feather direction in the period from azimuth angle 90 deg to 270 deg, the pitch angle is changed from θ1 to the fine side from θ1 to 90 deg and 270 deg to 360 deg. Correct to θ3. Along with this, at the azimuth angle of 0 deg to 90 deg, the load on the blade base decreases from L3 to L1 (compared to the comparative example, the peak load increases to L3), and from the azimuth angle of 270 deg to 360 deg, from L1 to L3. To increase. The load change of the blade base decreases from 0 to -dL3 and then increases to 0 at an azimuth angle of 0 deg to 90 deg. At an azimuth angle of 270 deg to 360 deg, it increases from 0 to dL3 and then decreases to 0. It is located in a region other than the tower shadow (in this embodiment, 0 deg to 90 deg and 270 deg to 360 deg, but not limited to this region, and it is not impossible to set only one of 0 deg to 90 deg and 270 deg to 360 deg). When making this correction, the pitch angle is finer than the pitch angle (when the correction value is added to or subtracted from the pitch angle command basic value, the value determined by the pitch angle command basic value) when this correction is not considered (as in the comparative example). By setting it to the side, it is possible to reduce the load change of the blade base without reducing the power generation output when captured at one round of the azimuth angle.

  In the pitch angle correction means 401 shown in FIGS. 5 and 6, the pitch angle correction is continuously changed with a smooth curve. However, the pitch angle correction unit 401 is not limited to this and may take other forms.

  FIG. 7 shows an example in which the pitch angle correction format of the pitch angle correction means 401 is changed, and the pitch angle correction is held at a constant value during a part of the period when the tower shadow passes. The horizontal axis in FIG. 7 indicates the azimuth angle, and the vertical axis in FIG. 7 indicates the blade pitch angle. The upper part of the figure shows the feather direction with respect to the blade pitch angle.

  In FIG. 7, the operation of the pitch angle from θ1 to θ2 is completed during the period of the azimuth angle φp1 to φ1, the pitch angle θ2 is maintained during the period of the azimuth angle φ1 to φ2, and the pitch angle is changed during the period of the azimuth angle φ2 to φp2. Change from θ2 to θ1.

  On the other hand, as shown in FIG. 8, there may be no stop period and the pitch angle may be set to operate continuously. FIG. 8 shows an example in which the pitch angle correction unit 401 continuously operates to correct the pitch angle. The horizontal axis in FIG. 8 indicates the azimuth angle, and the vertical axis in FIG. 8 indicates the blade pitch angle. The upper part of the figure shows the feather direction with respect to the blade pitch angle. The form of pitch angle correction shown in FIG. 8 is the same as the form shown in FIG.

  In both cases of FIGS. 7 and 8, the pitch angle is adjusted before reaching the azimuth angle (azimuth angle determined by the pitch angle correction end azimuth angle calculation unit 404 or the like) for adjusting the pitch angle in consideration of the tower shadow characteristic. The change operation to the fine side (return operation to the pitch angle without considering this correction) is started.

<< Azimuth angle range for correcting the pitch angle in the embodiment of the present application >>
Hereinafter, the azimuth angle range in which the pitch angle correction unit 401 in the embodiment of the present application corrects the pitch angle will be described.

  In FIG. 9, the azimuth angle with which the pitch angle correction means 401 corrects the pitch angle is an angle between blades (usually 180 degrees for two blades and usually 120 degrees for three blades). It is a figure which shows the example which is the following. In FIG. 9, the azimuth angle between (the two closest blades) of the plurality of blades 2 provided in the wind turbine generator 1 is defined as φb. The pitch angle correction means 401 of this embodiment is a pitch angle correction range indicating the range of the azimuth angle from the azimuth angle φp1 at which the pitch angle correction is started to the azimuth angle φp2 at which the pitch angle correction is completed (when positioned in the tower shadow). In this example, azimuth angle range (pitch angle adjustment) φp is smaller than φb (φp <φb). Although FIG. 9 shows a state in which φp is smaller than φb, φp and φb may almost coincide with each other, or φp may be about 1/10 of φb. Although it does not exclude φp> φb, in this case, a plurality of blades simultaneously come closer to the feather side than usual. Considering the amount of power generation and the like, φp and φb are preferably at least approximately the same, and more preferably φp <φb.

  FIG. 10 is a diagram showing a state in which the pitch angle correction range φp shown in FIG. 9 includes an azimuth angle φt indicating the tower position. As shown in FIG. 10, by including in the pitch angle correction range φp by the pitch angle correction means 401 of this embodiment, it becomes more reliable to suppress the vibration of the blade and the drive train due to the tower shadow. Further, the center azimuth angle of the pitch angle correction range φp may coincide with φt.

  FIG. 11 shows an example in which the center azimuth angle φpm of the pitch angle correction range φp shown in FIGS. 9 and 10 does not coincide with the azimuth angle φt indicating the tower position. As shown in FIG. 11, the pitch angle may be corrected by correcting the pitch angle as an azimuth angle with φpm smaller than φt, and although not clearly shown in the figure, the pitch angle as an azimuth angle with φpm larger than φt. It is also possible to correct this.

<< The form of the wind power generator 1 in embodiment of this application >>
Below, the system of the wind power generator 1 which applies the pitch angle correction | amendment means 401 in embodiment of this application is demonstrated.

  FIG. 12 shows an example of an upwind method in which the rotor 4 of the wind power generator 1 is located on the windward side of the tower 7. FIG. 13 shows an example of a downwind system in which the rotor 4 of the wind turbine generator 1 is arranged leeward than the tower 7. In both of the systems shown in FIGS. 12 and 13, there is an influence of a tower shadow characteristic in which the wind in the vicinity of the tower is blocked by the tower, and vibrations are generated in the blade and the drive train. Therefore, the pitch angle correcting unit 401 in the embodiment of the present application is used. Has an effect of alleviating the load change of the blade for any of the methods.

<< Processing of Pitch Angle Correction Unit 401 in the Embodiment of the Present Application >>
In the above description, the sensor output, which is the output signal of the sensor 10, is used to calculate the maximum pitch angle correction value. Specifically, the sensor output is used for wind speed, blade displacement, blade load, rotor rotation. The speed, the generator rotation speed, the tower inclination angle, the tower load, etc. may be mentioned. In this case, it is possible to perform the same control by replacing the sensor output described with reference to FIG.

<< Flowchart of tower vibration suppression control in the embodiment of the present application >>
FIG. 14 shows an example of a flowchart of the pitch angle correction means 401 in the embodiment of the present application. The flow of the block diagram of FIG. 4 is described as a flow.

  In step S2101, information serving as input to the pitch angle correction unit 401 is measured by a sensor, and a value is determined by signal processing. In step S2102, the azimuth angle of the blade 2 whose pitch angle is to be corrected is determined. In step S2103, the pitch angle correction maximum value is determined from the sensor output determined in step S2101 and the azimuth angle determined in step S2102. In step S2104, the pitch angle correction start azimuth angle is determined based on the sensor output determined in step S2101 and the azimuth angle determined in step S2102. In step S2105, the pitch angle end start azimuth angle is determined based on the sensor output determined in step S2101 and the azimuth angle determined in step S2102. In step S2106, the azimuth angle determined in step 2102, the maximum pitch angle correction value determined in step 2103, the pitch angle correction start azimuth angle determined in step 2104, and the pitch angle correction determined in step S2105. Based on the end azimuth angle, the pitch angle correction amount according to the azimuth angle is determined. In step 2107, the pitch angle command value is determined by adding the pitch angle correction amount determined in step 2106 to the pitch angle basic command value determined by variable speed control or the like. After processing the above steps, the series of operations is terminated, and the same processing is performed in the next cycle.

  The wind power generator to which the present invention is applied need not be limited to being attached to a specific foundation or foundation. For example, even if it is a landing type wind power generator in which a tower is installed on the ground or the seabed, It may be a floating wind power generator installed on a base floating in the sea area.

DESCRIPTION OF SYMBOLS 1 Wind power generator 2 Blade 3 Hub 4 Rotor 5 Pitch actuator 6 Nacelle 7 Tower 8 Azimuth angle detection sensor 9 Controller 10 Sensor 401 Pitch angle correction means 402 Pitch angle correction maximum value calculation unit 403 Pitch angle correction start azimuth angle calculation unit 404 End of pitch angle correction azimuth angle calculator 405 Pitch angle correction value calculator 406 Adder

Claims (7)

A blade that rotates in response to wind, a tower that supports the load of the blade, and a sensor,
A wind power generator capable of adjusting the pitch angle of the blade,
The pitch angle when the blade is located in the tower shadow of the tower is adjusted to the feather side ,
A range for adjusting the pitch angle is determined according to at least one of a blade displacement amount, a blade load, a tower inclination angle and a tower load as an output of the sensor, and an azimuth angle of the blade,
The pitch angle correction maximum value is obtained by calculating the blade load of the blade base from the output of the sensor provided in the blade base, the blade load of the blade base at the azimuth angle affected by the tower shadow, A wind power generator characterized by being determined in proportion to a difference from the blade load of the blade base at the azimuth angle without the influence of a tower shadow . The wind turbine generator according to claim 1,
The wind power generator characterized in that the pitch angle is adjusted to the fine side when positioned other than the tower shadow. The wind turbine generator according to claim 2,
The pitch angle is adjusted to the fine side when the blade is positioned at 0 deg to 90 deg or 270 deg to 360 deg on the azimuth angle when the blade is positioned at the apex on the azimuth angle. A featured wind power generator. A wind turbine generator according to any one of claims 1 to 3,
The wind power generator characterized by the range of the azimuth angle which adjusts the said pitch angle when it is located in the said tower shadow being below the azimuth angle between the said several blades. The wind power generator according to any one of claims 1 to 4,
The wind power generator according to claim 1, wherein a speed at which the pitch angle is adjusted when the blade is positioned in a tower shadow of the tower is a maximum pitch speed. A wind turbine generator according to any one of claims 1 to 5,
In consideration of the rotational speed of the blade and the time required for changing the pitch angle, the wind power generator starts adjusting the pitch angle to the feather side before the blade is positioned in the tower shadow. A wind turbine generator according to any one of claims 1 to 6 ,
Before reaching the azimuth angle at which the adjustment of the pitch angle ends, the pitch angle is changed to the fine side.