专利汇可以提供WINDMILL PITCH ANGLE CONTROLLER AND METHOD FOR CONTROLLING WINDMILL PITCH ANGLE专利检索,专利查询,专利分析的服务。并且The object is to reduce aerodynamic load when a wind turbine is halted. When a wind turbine halt command is input, pitch angles of wind turbine blades 5-1, 5-2, and 5-3 are matched, and then the pitch angles of the wind turbine blades 5-1, 5-2, and 5-3 are moved to a feathering position.,下面是WINDMILL PITCH ANGLE CONTROLLER AND METHOD FOR CONTROLLING WINDMILL PITCH ANGLE专利的具体信息内容。
The present invention relates to a wind turbine pitch-angle control device for individually controlling pitch angles of wind turbine blades and to a method thereof.
Conventionally, in controlling a wind turbine, the wind turbine is halted when the wind speed exceeds a cutout wind speed at which operation should be halted or when an abnormality, such as acceleration or excessive power output, occurs. When the wind turbine is halted, the pitch angles of the wind turbine blades are moved from operating state positions to a feathering position (for example, refer to Patent Document 1).
Japanese Unexamined Patent Application, Publication No.
When an independent pitch control method for individually controlling the pitch angles of the respective wind turbine blades is employed, the pitch angles of the wind turbine blades do not necessarily match when the wind turbine is halted. Thus, for example, the wind turbine blades may be moved from different pitch angles to the feathering position (see
The present invention was conceived to solve the above-described problem, and an object therefor is to provide a pitch-angle control method of wind turbine blades, a device thereof, and a wind turbine that are capable of reducing aerodynamic load when the wind turbine is halted.
To solve the above-described problem, the present invention employs the following solutions.
A first aspect of the present invention is a wind turbine pitch-angle control device configured to carry out individual pitch-angle control for individually controlling pitch angles of a plurality of wind turbine blades, wherein, when a wind turbine halt command is input, the pitch angles of the wind turbine blades are matched, and then the pitch angles of the wind turbine blades are moved to a feathering position.
By performing control in this way, when a wind turbine halt command is input, the pitch angles of the wind turbine blades can be moved to the feathering position with the pitch angles being matched. In this way, aerodynamic load generated by an imbalance in the pitch angles can be reduced.
In the above-described wind turbine pitch-angle control device, when the wind turbine halt command is input, a representative wind turbine blade may be identified on the basis of the pitch angle from among the plurality of wind turbine blades, the pitch angle of the representative wind turbine blade and the pitch angles of the other wind turbine blades may be matched, and then the pitch angles of the wind turbine blades may be moved to the feathering position.
In this way, by identifying the representative wind turbine blade from among a plurality of wind turbine blades and controlling the pitch angles of the other wind turbine blades so as to match the pitch angles to the pitch angle of the representative wind turbine blade, the pitch angles of the wind turbine blades can be matched efficiently.
More specifically, for example, the wind turbine blade whose pitch angle may be closest to the feathering position is identified as the representative wind turbine blade.
In this way, since the wind turbine blade whose pitch angle is closest to the feathering position is identified as the representative wind turbine blade and the pitch angles of the other wind turbine blades are matched to the pitch angle of the representative wind turbine blade, the pitch angles of the wind turbine blades can be moved to the feathering position efficiently.
In the above-described wind turbine pitch-angle control device, by setting the moving speed of the pitch angle of the representative wind turbine blade smaller than the moving speeds of the pitch angles of the wind turbine blades other than the representative wind turbine blade, the pitch angles of the wind turbine blades other than the wind turbine blade and the pitch angle of the representative wind turbine blade may be matched.
In this way, by setting the moving speed of the pitch angle of the representative wind turbine blade smaller than the moving speeds of the pitch angles of the wind turbine blades other than the representative wind turbine blade, the pitch angles of the other wind turbine blades can be matched to the pitch angle of the representative wind turbine blade while carrying out control for adjusting the pitch angle of the representative wind turbine blade closer to the feathering position. In this way, the time required for moving the pitch angles to the feathering position is reduced compared with when the movement of the pitch angle of the representative wind turbine blade is stopped.
In the above-described wind turbine pitch-angle control device, after the pitch angles of the wind turbine blades are matched, the wind turbine blades may be moved to the feathering position by controlling the wind turbine blades using a common pitch-angle control command.
Since the pitch angles of the wind turbine blades are moved on the basis of the common pitch-angle command after the pitch angles of the wind turbine blades are matched, control can be simplified, and the aerodynamic load on the wind turbine blades can be reduced.
A second aspect of the present invention is a wind turbine including the wind turbine pitch-angle control device described above.
A third aspect of the present invention is a wind turbine pitch-angle control method for carrying out independent pitch-angle control for individually controlling pitch angles of a plurality of wind turbine blades, wherein, when a wind turbine halt command is input, the pitch angles of the wind turbine blades are matched, and then the pitch angles of the wind turbine blades are moved to a feathering position.
The present invention is advantageous in that aerodynamic load can be reduced while the wind turbine is halted.
An embodiment of a pitch-angle control method of a wind turbine blade, a device therefor, and a wind turbine according to the present invention will be described below with reference to the drawings.
A wind turbine pitch-angle control device 10 (see
As shown in
The above-mentioned θcom is a common pitch angle, which is a value common to all wind turbine blades. Δθ1, Δθ2, and Δθ3 are adjustment amounts that are set according to the wind turbine blades; for example, they are set to correspond to the loads on the wind turbine blades and the operating environment etc. of the wind turbine, such as wind speed and wind direction.
The pitch-angle command value θcom+Δθ1 is provided to a driving device 11-1 for drive control of the pitch angle of the wind turbine blade 5-1; the pitch-angle command value θcom+Δθ2 is provided to a driving device 11-2 for drive control of the pitch angle of the wind turbine blade 5-2; and the pitch-angle command value θcom+Δθ3 is provided to a driving device 11-3 for drive control of the pitch angle of the wind turbine blade 5-3. In this way, the pitch angles of the wind turbine blades 5-1, 5-2, and 5-3 are controlled by operating the driving devices 11-1, 11-2, and 11-3 in response to the input pitch-angle control values. The driving devices 11-1, 11-2, and 11-3 are each constructed of an actuator or the like having a fluid-pressure cylinder, etc.
In such a wind turbine pitch-angle control device 10, a wind turbine halt command is generated at another control device, which is not shown, when the wind speed exceeds the cutout wind speed at which operation should be halted or when an abnormality such as acceleration or excessive power output occurs.
When the wind turbine pitch-angle control device 10 receives such a wind turbine halt command, the pitch-angle command values for the wind turbine blades 5-1, 5-2, and 5-3 are calculated so as to move the wind turbine blades 5-1, 5-2, and 5-3 to the feathering positions. Here, the feathering position is a position in which the blade surface of a wind turbine blade is substantially parallel to the wind direction. At this position, it is possible to achieve a condition in which the effect of the wind power is minimized. Furthermore, the feathering position can be arbitrarily set within a pitch angle range that achieves the condition in which the effect of the wind power is substantially minimized. In this embodiment, the feathering position is set to, for example, 110°. Furthermore, in this embodiment, the position where the blade surface of a wind turbine blade is substantially perpendicular to the wind direction, i.e., a state most affected by wind, is defined as a pitch angle of 20°.
The pitch-angle control method of the wind turbine blades when a wind turbine halt command is input is described below with reference to
First, when a wind turbine halt command is input, the pitch-angle control device 10 compares the actual pitch angles of the wind turbine blades 5-1, 5-2, and 5-3 and determines whether or not the pitch angles of the wind turbine blades substantially match (Step SA1 in
As a result, when the pitch angles of the wind turbine blades do not substantially match ("NO" in Step SA1 in
Descriptions will be provided below for when the wind turbine blade 5-1 is identified as the representative wind turbine blade.
Subsequently, the pitch-angle command values of the wind turbine blades are determined by setting a minimum adjustment amount ΔθLOW set in advance as the adjustment amount Δθ1 corresponding to the wind turbine blade 5-1, which is the representative wind turbine blade, and by setting a maximum adjustment amount ΔθHIGH set in advance as the adjustment amounts Δθ2 and Δθ3 corresponding to the other wind turbine blades 5-2 and 5-3 (Step SA3 in
At this time, the adjustment amounts of the wind turbine blades whose pitch angle difference with respect to the representative wind turbine blade is less than a predetermined value are set to the minimum adjustment amount ΔθLOW. In this way, the pitch angle difference, relative to the pitch angle of the representative wind turbine blade, of a wind turbine blade whose pitch angle is within a predetermined range can be prevented from increasing.
It is preferable to set the ΔθHIGH to, for example, the capacity limit of each driving device or a value close to the limit. By setting it to such a value, the pitch angles of the wind turbine blades other than the representative wind turbine blade can be efficiently and quickly matched to the pitch angle of the representative wind turbine blade. Moreover, the minimum adjustment amount ΔθLOW may be set to a value smaller than the maximum adjustment value, for example, zero. By setting the minimum adjustment amount ΔθLOW to a value other than zero, the pitch angles of the other wind turbine blades can be matched to the pitch angle of the representative wind turbine blade while carrying out control for adjusting the pitch angle of the representative wind turbine blade closer to the feathering position, and thus the wind turbine blades can be efficiently moved to the feathering position.
In this embodiment, for example, the minimum adjustment amount ΔθLOW is set to 1 (°/s), and the maximum adjustment amount ΔθHIGH is set to 7 (°/s).
Next, the pitch-angle command values of the wind turbine blades 5-1, 5-2, and 5-3 set in this way are output to the driving devices 11-1, 11-2, and 11-3, respectively (Step SA4 in
When the pitch angles of the wind turbine blades 5-1, 5-2, and 5-3 substantially match by repeating the processing described above ("YES" in Step SA1), subsequently, the pitch-angle command values corresponding to the wind turbine blades 5-1, 5-2, and 5-3 are set to a common value by setting the adjustment values Δθ1 to Δθ3 of the wind turbine blades 5-1, 5-2, and 5-3 to the maximum adjustment amount ΔθHICH (Step SA5 in
Then, when the pitch angles of the wind turbine blades 5-1, 5-2, and 5-3 match the feathering position (110°) ("YES" in Step SA6 in
As described above, in the wind turbine pitch-angle control device according to this embodiment and the method thereof, when a wind turbine halt command is input, the wind turbine blade closest to the feathering position (closest to the fine side) is identified as the representative wind turbine blade. By setting the pitch-angle command value of this representative wind turbine blade smaller than the pitch-angle command values of the other wind turbine blades, the pitch angles of the other wind turbine blades can be matched to the pitch angle of the representative wind turbine blade by slowly moving the pitch angle of the representative wind turbine blade and quickly moving the pitch angles of the other wind turbine blades, as shown in
An embodiment of the present invention has been described in detail above with reference to the drawings. However, the detailed structure is not limited to this embodiment, and design modifications, etc. that do not depart from the scope of the present invention are also included.
For example, in this embodiment, when a wind turbine halt command is input, the common pitch angle θcom for the wind turbine blades may be set to zero. By setting the common pitch angle θcom to zero, the wind turbine blades can be controlled by the maximum adjustment amount ΔθHIGH or minimum adjustment amount ΔθLOW. In this way, since the moving speed of the representative wind turbine blade can be decreased even more, the pitch angles of the wind turbine blades can be matched even more quickly.
In this embodiment, the wind turbine blade whose pitch angle is closest to the feathering position is identified as the representative wind turbine blade. Instead, however, another wind turbine blade may be identified as the representative wind turbine blade, and the pitch angles of the other wind turbine blades may be matched to this representative wind turbine blade.
In this embodiment, the adjustment amount of the representative wind turbine blade is set to the minimum adjustment amount, and the adjustment amounts of the other wind turbine blades are set to the maximum adjustment amount. However, it is not limited to this example, and the adjustment amounts of the other wind turbine blades may be increased, in stages, starting from the one furthest from the feathering position. In other words, in the present invention, to move the pitch angles of the wind turbine blades to the feathering position, the pitch angles of the wind turbine blades should be matched before the pitch angles of the wind turbine blades reach the feathering position, and then, after the pitch angles are matched, the pitch angles of the wind turbine blades may be moved in synchronization. The procedure of matching the pitch angles of the wind turbine blades should be selected arbitrarily.
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