CN117231418A - Method and system for limiting load reduction of My (My) of fixed hub of wind generating set - Google Patents

Method and system for limiting load reduction of My (My) of fixed hub of wind generating set Download PDF

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Publication number
CN117231418A
CN117231418A CN202311208766.4A CN202311208766A CN117231418A CN 117231418 A CN117231418 A CN 117231418A CN 202311208766 A CN202311208766 A CN 202311208766A CN 117231418 A CN117231418 A CN 117231418A
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China
Prior art keywords
blade
angle
pitch angle
azimuth
pitch
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Inventor
谭丹
赵晓峻
陈天宇
于虹
曾超
何晓聪
王佑
黄晶晶
黄硕
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MingYang Smart Energy Group Co Ltd
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MingYang Smart Energy Group Co Ltd
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Priority to CN202311208766.4A priority Critical patent/CN117231418A/en
Publication of CN117231418A publication Critical patent/CN117231418A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Abstract

The invention discloses a method and a system for reducing load of a My limit load of a fixed hub of a wind generating set, wherein when the wind generating set encounters extreme turbulence above a rated wind speed, the following steps are executed: 1) Blade position correction; 2) Acquiring a wind speed signal and a pitch angle signal of a unit; 3) Acquiring a blade azimuth signal; 4) If the maximum value of the My limit load of the fixed hub is Mymax overrun, executing the step 6), and if the minimum value of the My limit load of the fixed hub is Mymin overrun, executing the step 5); 5) Establishing an interpolation table of lower half plane azimuth angle-pitch angle; 6) Establishing an interpolation table of the azimuth angle-pitch angle of the upper half plane; 7) Dynamically calculating superimposed pitch angles according to interpolation table results of azimuth angles and pitch angles; 8) Executing pitch control; 9) And exiting the strategy. The invention can effectively solve the problem that the limit load of the fixed hub My exceeds the limit under the extreme turbulence working condition.

Description

Method and system for limiting load reduction of My (My) of fixed hub of wind generating set
Technical Field
The invention relates to the technical field of wind power generation, in particular to a method, a system, a storage medium and computing equipment for limiting load reduction of a fixed hub My of a wind generating set.
Background
The main sources of the load of the wind generating set are aerodynamic load, gravity load, inertial load and other loads (temperature load, icing load and the like), which are important factors affecting the cost and efficiency of the whole wind generating system. The limit load of a wind power generator set generally occurs under fault conditions, extreme gusts, extreme turbulence, years of first-meeting or years of first-meeting limit wind speeds.
According to the IEC 61400-1 standard, all extreme conditions and general possibilities that may occur during the lifetime of a wind power plant, such as extreme gusts or extreme turbulence, grid power loss, pitch failure, etc., have to be considered during the plant design evaluation phase. The limit load of the wind generating set often occurs in extreme wind conditions or fault conditions.
When the wind turbine generator system encounters extreme turbulence wind, the conventional method is to strengthen all subsystems and parts of the wind turbine generator system, so that the parts are not failed or damaged, but the diameter of a wind wheel, the manufacturing cost and the like of the wind turbine generator system are limited, or a power-reducing load-reducing mode is adopted when the wind turbine generator system encounters extreme turbulence wind, so that the power generation performance of the wind turbine generator system is seriously influenced, and the generated energy of the wind turbine generator system is lost.
The invention mainly aims to solve the problem that the limit load of the fixed hub My exceeds the limit under the extreme turbulence working condition. There are two conventional ways to reduce the fixing hub My: 1. redundancy of the fixed hub My limit load is increased by exchanging hardware, which results in an increase in cost; 2. when an extreme turbulence working condition is detected, the limit load of the fixed hub My is reduced by reducing the rotation speed of the impeller or reducing the power, and the power loss can be caused by the mode, so that the generating capacity of the unit is affected.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides a safe and reliable load reduction method for limiting the load of a fixed hub My of a wind generating set, which can effectively solve the problem that the limiting load of the fixed hub My exceeds the limit under the extreme turbulence working condition.
The second aim of the invention is to provide a My limit load reduction system of a fixed hub of a wind generating set.
A third object of the present invention is to provide a storage medium.
It is a fourth object of the present invention to provide a computing device.
The first object of the invention is achieved by the following technical scheme: a method for reducing load of a fixed hub My limit load of a wind generating set includes the following steps when the wind generating set encounters extreme turbulence above a rated wind speed:
1) Blade position correction;
adopting an inverted Y-shaped correction mode, namely, the azimuth angle of the blade 1 at the uppermost is 0 degrees, correspondingly, the azimuth angle of the blade 2 at the moment is 120 degrees, the azimuth angle of the blade 3 at the moment is 240 degrees, and executing the step 2 after the azimuth angle correction is finished;
2) Acquiring a wind speed signal and a pitch angle signal of a unit;
if the wind speed is greater than the wind speed threshold value and the pitch angle is greater than the angle threshold value, executing the step 3), and if the wind speed is not greater than the angle threshold value, executing the step 9);
3) Acquiring a blade azimuth signal;
after the wind generating set enters a normal power generation mode, the azimuth angle of the blade 1 is read from an azimuth angle sensorCalculating azimuth angles +_for blade 2 and blade 3>And->After the blade azimuth angle information is acquired, executing the step 4);
4) If the maximum value of the My limit load of the fixed hub is Mymax overrun, executing the step 6), and if the minimum value of the My limit load of the fixed hub is Mymin overrun, executing the step 5);
5) Establishing an interpolation table of lower half plane azimuth angle-pitch angle;
6) Establishing an interpolation table of the azimuth angle-pitch angle of the upper half plane;
7) Dynamically calculating superimposed pitch angles according to interpolation table results of azimuth angles and pitch angles;
8) Executing pitch control;
according to the existing pitch angle command value theta of each blade PIout And the superimposed pitch angle command value of the azimuth FinePitch, determining the final pitch angle control value of each blade;
9) Exiting the strategy;
if the wind speed is not satisfied to be greater than the wind speed threshold and the pitch angle is greater than the angle threshold, then a normal power generation mode is performed.
Further, in step 3), the azimuth angles of the blades 2 and 3And->The calculation formula of (2) is as follows:
further, in step 5), an interpolation table is established according to the corresponding relationship between azimuth angle and pitch angle, and in order to reduce the thrust of the lower half plane of the impeller, that is, increase the limit load of the fixed hub Mymin, a preset pitch angle needs to be superimposed on the lower half plane of the impeller, and the stacking rule is as follows: when the azimuth angle of the blade is 0-90 degrees, the superimposed pitch angle is 0 degrees, when the azimuth angle of the blade is 180 degrees, the superimposed pitch angle is 1 degrees, and when the azimuth angle of the blade is 270-360 degrees, the superimposed pitch angle is 0 degrees, namely the superimposed pitch angle of the azimuth angle of the blade is gradually increased from 90-180 degrees, and the superimposed pitch angle is gradually decreased from 180-270 degrees; step 7) is performed according to the result of the interpolation table.
Further, in step 6), an interpolation table is established according to the corresponding relationship between azimuth angle and pitch angle, and in order to reduce the thrust of the upper half plane of the impeller, that is, reduce the limit load of the fixed hub Mymax, a preset pitch angle needs to be superimposed on the upper half plane of the impeller, and the stacking rule is as follows: when the azimuth angle of the blade is 0 DEG, the superimposed pitch angle is 1 DEG, and when the azimuth angle of the blade is 90 DEG-270 DEG, the superimposed pitch angle is 0 DEG, namely the azimuth angle of the blade is 0 DEG to 90 DEG, the superimposed pitch angle is gradually reduced, and the azimuth angle of the blade is 270 DEG to 360 DEG, and the superimposed pitch angle is gradually increased; step 7) is performed according to the result of the interpolation table.
Further, in step 7), the table results of step 5) or 6) are used to adjust the pitch angle command value θ of the blades 1, 2, 3 to be superimposed in real time according to the superposition rule of the blade azimuth angles Az1 、θ Az2 、θ Az3 And (3) executing the step 8 according to the superimposed pitch angle command value.
Further, in step 8), according to the existing pitch angle command value θ for each blade PIout And a superimposed azimuth angle FinePitch pitch angle command value θ Az1 、θ Az2 、θ Az3 Determining a final pitch angle control value θ for blades 1, 2, 3 PitchDemand1 、θ PitchDemand2 、θ PitchDemand3 Applying this value to the pitch actuator of the wind power plant for controlEach blade is manufactured to execute corresponding variable pitch action so as to adjust the limit load of the fixed hub My of the wind generating set;
θ PitchDemand1 ＝θ PIout +θ Az1
θ PitchDemand2 ＝θ PIout +θ Az2
θ PitchDemand3 ＝θ PIout +θ Az3
in θ PIout And the pitch angle command value is a pitch PI control pitch angle command value.
The second object of the invention is achieved by the following technical scheme: the utility model provides a wind generating set fixed hub My limit load reduction system for realize above-mentioned wind generating set fixed hub My limit load reduction method, it includes:
the blade position correction module adopts an inverted Y-shaped correction mode, namely the azimuth angle of the blade 1 at the uppermost is 0 degrees, correspondingly, the azimuth angle of the blade 2 at the moment is 120 degrees, the azimuth angle of the blade 3 at the moment is 240 degrees, and the first signal acquisition module is executed after the azimuth angle correction is completed;
the first signal acquisition module is used for acquiring a wind speed signal and a pitch angle signal of the unit, if the wind speed is greater than a wind speed threshold value and the pitch angle is greater than an angle threshold value, the second signal acquisition module is executed, and if the wind speed is not greater than the wind speed threshold value, the exit strategy module is executed;
the second signal acquisition module is used for acquiring azimuth signals of the blades, and reading azimuth angles of the blades 1 from the azimuth angle sensor after the wind generating set enters a normal power generation modeCalculating azimuth angles +_for blade 2 and blade 3>And->After the blade azimuth angle information is obtained, executing a judging module;
the judging module is used for executing the second interpolation table module if the maximum value of the My limit load of the fixed hub is Mymax overrun, and executing the first interpolation table module if the minimum value of the My limit load of the fixed hub is Mymin overrun;
the first interpolation table module is used for establishing an interpolation table of the azimuth angle-pitch angle of the lower half plane and executing a calculation module according to the result of the interpolation table;
the second interpolation table module is used for establishing an interpolation table of the azimuth angle-pitch angle of the upper half plane and executing a calculation module according to the result of the interpolation table;
the calculation module is used for dynamically calculating the superimposed pitch angle according to the interpolation table result of the azimuth angle and the pitch angle;
the pitch control module controls the value theta according to the existing pitch angle of each blade PIout And the superimposed pitch angle command value of the azimuth FinePitch, determining the final pitch angle control value of each blade;
and exiting the strategy module, and executing a normal power generation mode if the wind speed is not greater than the wind speed threshold value and the pitch angle is greater than the angle threshold value.
The third object of the invention is achieved by the following technical scheme: a storage medium stores a program, and when the program is executed by a processor, the method for reducing the load of the fixed hub My limit of the wind generating set is realized.
The fourth object of the invention is achieved by the following technical scheme: the computing device comprises a processor and a memory for storing a program executable by the processor, wherein when the processor executes the program stored by the memory, the limiting load reducing method of the fixed hub My of the wind generating set is realized.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the limit load of the fixed hub My is solved in a software mode without increasing hardware cost.
2. The implementation mode is simple and reliable.
3. And the device is started under the condition of strong wind, and no loss is caused to the generated energy.
Drawings
FIG. 1 is one of the azimuth-pitch angle correspondence maps.
FIG. 2 is a second plot of azimuth-pitch angle correspondence.
FIG. 3 is a graph of azimuth angle versus superimposed pitch angle.
FIG. 4 is a graph of pitch angle control values for blades 1, 2, 3.
Fig. 5 is a diagram of the architecture of the system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
The embodiment discloses a wind generating set fixed hub My limit load reduction method, when the wind generating set encounters extreme turbulence above rated wind speed, the following steps are executed:
1) Blade position correction;
and (3) adopting an inverted Y-shaped correction mode, namely, the azimuth angle of the blade 1 at the uppermost position is 0 degrees, correspondingly, the azimuth angle of the blade 2 at the moment is 120 degrees, the azimuth angle of the blade 3 at the moment is 240 degrees, and executing the step (2) after the azimuth angle correction is completed.
2) Acquiring a wind speed signal and a pitch angle signal of a unit;
if the wind speed is greater than the wind speed threshold and the pitch angle is greater than the angle threshold, then step 3) is performed, and if not, step 9) is performed.
3) Acquiring a blade azimuth signal;
after the wind generating set enters a normal power generation mode, the azimuth angle of the blade 1 is read from an azimuth angle sensorCalculating azimuth angles +_for blade 2 and blade 3>And->Calculation formulaThe formula is as follows:
after the blade azimuth information is acquired, step 4) is executed.
4) If the maximum value of the limiting load of the fixed hub My (namely Mymax) exceeds the limit, the step 6) is executed, and if the minimum value of the limiting load of the fixed hub My (namely Mymin) exceeds the limit, the step 5) is executed.
5) Establishing an interpolation table of lower half plane azimuth angle-pitch angle;
according to the corresponding relation of azimuth angle and pitch angle, an interpolation table is established, and in order to reduce the thrust of the lower half plane of the impeller, namely to increase the limit load of the fixed hub Mymin, the preset pitch angle is required to be overlapped on the lower half plane of the impeller, wherein the overlapping rule is as follows: as shown in fig. 1, when the blade azimuth angle is 0 ° -90 °, the superimposed pitch angle is 0 °, when the blade azimuth angle is 180 °, the superimposed pitch angle is 1 °, and when the blade azimuth angle is 270 ° -360 °, the superimposed pitch angle is 0 °, i.e., the blade azimuth angle gradually increases from 90 ° -180 ° and the superimposed pitch angle gradually decreases from 180 ° -270 °; step 7) is performed according to the result of the interpolation table.
As shown in FIG. 3, the azimuth angle varies from 0-360, the superimposed pitch angle varies from 0-1, the blade azimuth angle increases gradually from 90-180, and the blade azimuth angle decreases gradually from 180-270.
6) Establishing an interpolation table of the azimuth angle-pitch angle of the upper half plane;
according to the corresponding relation of azimuth angle and pitch angle, an interpolation table is established, and in order to reduce the thrust of the upper half plane of the impeller, namely reduce the limit load of the fixed hub Mymax, the preset pitch angle is required to be overlapped on the upper half plane of the impeller, wherein the overlapping rule is as follows: as shown in fig. 2, at a blade azimuth angle of 0 °, the superimposed pitch angle is 1 °, and at a blade azimuth angle of 90 ° -270 °, the superimposed pitch angle is 0 °, i.e. the blade azimuth angle decreases from 0 ° -90 °, the blade azimuth angle increases from 270 ° -360 °. Step 7) is performed according to the result of the interpolation table.
7) Dynamically calculating superimposed pitch angles according to interpolation table results of azimuth angles and pitch angles;
adopting the table result of the step 5) or 6), and adjusting the pitch angle command value theta of the blades 1, 2 and 3 to be overlapped in real time according to the superposition rule of the blade azimuth angles Az1 、θ Az2 、θ Az3 And (3) executing the step 8 according to the superimposed pitch angle command value.
8) Executing pitch control;
according to the existing pitch angle command value theta of each blade PIout And a superimposed azimuth angle FinePitch pitch angle command value θ Az1 、θ Az2 、θ Az3 Determining a final pitch angle control value θ for blades 1, 2, 3 PitchDemand1 、θ PitchDemand2 、θ PitchDemand3 As shown in fig. 4, the final pitch angle control value θ PitchDemand1 、θ PitchDemand2 、θ PitchDemand3 Applying the value to a variable pitch actuator of the wind generating set, and controlling each blade to execute corresponding variable pitch action so as to adjust the limit load of a fixed hub My of the wind generating set;
θ PitchDemand1 ＝θ PIout +θ Az1
θ PitchDemand2 ＝θ PIout +θ Az2
θ PitchDemand3 ＝θ PIout +θ Az3
in θ PIout And the pitch angle command value is a pitch PI control pitch angle command value.
9) Exiting the strategy;
if the wind speed is not satisfied to be greater than the wind speed threshold and the pitch angle is greater than the angle threshold, then a normal power generation mode is performed.
Example 2
The embodiment discloses a wind generating set fixed hub My limit load reducing system, which is used for realizing the wind generating set fixed hub My limit load reducing method in embodiment 1, as shown in fig. 5, and comprises the following functional modules:
the blade position correction module adopts an inverted Y-shaped correction mode, namely the azimuth angle of the blade 1 at the uppermost is 0 degrees, correspondingly, the azimuth angle of the blade 2 at the moment is 120 degrees, the azimuth angle of the blade 3 at the moment is 240 degrees, and the first signal acquisition module is executed after the azimuth angle correction is completed;
the first signal acquisition module is used for acquiring a wind speed signal and a pitch angle signal of the unit, if the wind speed is greater than a wind speed threshold value and the pitch angle is greater than an angle threshold value, the second signal acquisition module is executed, and if the wind speed is not greater than the wind speed threshold value, the exit strategy module is executed;
the second signal acquisition module is used for acquiring azimuth signals of the blades, and reading azimuth angles of the blades 1 from the azimuth angle sensor after the wind generating set enters a normal power generation modeCalculating azimuth angles +_for blade 2 and blade 3>And->After the blade azimuth angle information is obtained, executing a judging module;
the judging module is used for executing the second interpolation table module if the maximum value of the My limit load of the fixed hub is Mymax overrun, and executing the first interpolation table module if the minimum value of the My limit load of the fixed hub is Mymin overrun;
the first interpolation table module is used for establishing an interpolation table of the azimuth angle-pitch angle of the lower half plane and executing a calculation module according to the result of the interpolation table;
the second interpolation table module is used for establishing an interpolation table of the azimuth angle-pitch angle of the upper half plane and executing a calculation module according to the result of the interpolation table;
the calculation module is used for dynamically calculating the superimposed pitch angle according to the interpolation table result of the azimuth angle and the pitch angle;
the pitch control module controls the value theta according to the existing pitch angle of each blade PIout And the superimposed pitch angle command value of the azimuth FinePitch, determining the final pitch angle control value of each blade;
and exiting the strategy module, and executing a normal power generation mode if the wind speed is not greater than the wind speed threshold value and the pitch angle is greater than the angle threshold value.
Example 3
The embodiment discloses a storage medium storing a program, which when executed by a processor, implements the method for limiting load shedding of the fixed hub My of the wind turbine generator set according to embodiment 1.
The storage medium in this embodiment may be a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a usb disk, a removable hard disk, or the like.
Example 4
The embodiment discloses a computing device, which comprises a processor and a memory for storing a program executable by the processor, wherein when the processor executes the program stored by the memory, the limiting load reduction method of the fixed hub My of the wind generating set in embodiment 1 is realized.
The computing device described in this embodiment may be a desktop computer, a notebook computer, a smart phone, a PDA handheld terminal, a tablet computer, a programmable logic controller (PLC, programmable Logic Controller), or other terminal devices with processor functionality.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.

Claims (9)

1. The limiting load reducing method for the fixed hub My of the wind generating set is characterized by comprising the following steps of:
1) Blade position correction;
adopting an inverted Y-shaped correction mode, namely, the azimuth angle of the blade 1 at the uppermost is 0 degrees, correspondingly, the azimuth angle of the blade 2 at the moment is 120 degrees, the azimuth angle of the blade 3 at the moment is 240 degrees, and executing the step 2 after the azimuth angle correction is finished;
2) Acquiring a wind speed signal and a pitch angle signal of a unit;
if the wind speed is greater than the wind speed threshold value and the pitch angle is greater than the angle threshold value, executing the step 3), and if the wind speed is not greater than the angle threshold value, executing the step 9);
3) Acquiring a blade azimuth signal;
after the wind generating set enters a normal power generation mode, the azimuth angle of the blade 1 is read from an azimuth angle sensorCalculating azimuth angles +_for blade 2 and blade 3>And->After the blade azimuth angle information is acquired, executing the step 4);
4) If the maximum value of the My limit load of the fixed hub is Mymax overrun, executing the step 6), and if the minimum value of the My limit load of the fixed hub is Mymin overrun, executing the step 5);
5) Establishing an interpolation table of lower half plane azimuth angle-pitch angle;
6) Establishing an interpolation table of the azimuth angle-pitch angle of the upper half plane;
7) Dynamically calculating superimposed pitch angles according to interpolation table results of azimuth angles and pitch angles;
8) Executing pitch control;
according to the existing pitch angle command value theta of each blade PIout And the superimposed pitch angle command value of the azimuth FinePitch, determining the final pitch angle control value of each blade;
9) Exiting the strategy;
if the wind speed is not satisfied to be greater than the wind speed threshold and the pitch angle is greater than the angle threshold, then a normal power generation mode is performed.
2. The method for limiting load shedding of the fixed hub My of the wind generating set according to claim 1, which is characterized in that: in step 3), the azimuth angles of the blades 2 and 3And->The calculation formula of (2) is as follows:
3. the method for limiting load shedding of the fixed hub My of the wind generating set according to claim 2, which is characterized in that: in step 5), according to the corresponding relation between azimuth angle and pitch angle, an interpolation table is established, and in order to reduce the thrust of the lower half plane of the impeller, namely to increase the limit load of the fixed hub Mymin, the preset pitch angle needs to be overlapped on the lower half plane of the impeller, wherein the overlapping rule is as follows: when the azimuth angle of the blade is 0-90 degrees, the superimposed pitch angle is 0 degrees, when the azimuth angle of the blade is 180 degrees, the superimposed pitch angle is 1 degrees, and when the azimuth angle of the blade is 270-360 degrees, the superimposed pitch angle is 0 degrees, namely the superimposed pitch angle of the azimuth angle of the blade is gradually increased from 90-180 degrees, and the superimposed pitch angle is gradually decreased from 180-270 degrees; step 7) is performed according to the result of the interpolation table.
4. The method for limiting load shedding of the fixed hub My of the wind generating set according to claim 3, wherein the method comprises the following steps of: in step 6), according to the corresponding relation between azimuth angle and pitch angle, an interpolation table is established, and in order to reduce the thrust of the upper half plane of the impeller, namely reduce the limit load of the fixed hub Mymax, the preset pitch angle is required to be overlapped on the upper half plane of the impeller, wherein the overlapping rule is as follows: when the azimuth angle of the blade is 0 DEG, the superimposed pitch angle is 1 DEG, and when the azimuth angle of the blade is 90 DEG-270 DEG, the superimposed pitch angle is 0 DEG, namely the azimuth angle of the blade is 0 DEG to 90 DEG, the superimposed pitch angle is gradually reduced, and the azimuth angle of the blade is 270 DEG to 360 DEG, and the superimposed pitch angle is gradually increased; step 7) is performed according to the result of the interpolation table.
5. The method for limiting load shedding of the fixed hub My of the wind generating set according to claim 4 is characterized in that: in step 7), the table results of step 5) or 6) are adopted to adjust the pitch angle command value theta of the blades 1, 2 and 3 to be overlapped in real time according to the superposition rule of the blade azimuth angles Az1 、θ Az2 、θ Az3 And (3) executing the step 8 according to the superimposed pitch angle command value.
6. The method for limiting load shedding of the fixed hub My of the wind generating set according to claim 5, wherein the method comprises the following steps of: in step 8), according to the existing pitch angle command value θ of each blade PIout And a superimposed azimuth angle FinePitch pitch angle command value θ Az1 、θ Az2 、θ Az3 Determining a final pitch angle control value θ for blades 1, 2, 3 PitchDemand1 、θ PitchDemand2 、θ PitchDemand3 Applying the value to a pitch actuator of the wind generating set to control each blade to execute a corresponding pitch action so as to adjust the limit load of a fixed hub My of the wind generating set;
θ PitchDemand1 ＝θ PIout +θ Az1
θ PitchDemand2 ＝θ PIout +θ Az2
θ PitchDemand3 ＝θ PIout +θ Az3
in θ PIout And the pitch angle command value is a pitch PI control pitch angle command value.
7. A wind generating set fixed hub My limit load reducing system, which is used for realizing the wind generating set fixed hub My limit load reducing method as defined in any one of claims 1 to 6, and comprises the following steps:
the blade position correction module adopts an inverted Y-shaped correction mode, namely the azimuth angle of the blade 1 at the uppermost is 0 degrees, correspondingly, the azimuth angle of the blade 2 at the moment is 120 degrees, the azimuth angle of the blade 3 at the moment is 240 degrees, and the first signal acquisition module is executed after the azimuth angle correction is completed;
the first signal acquisition module is used for acquiring a wind speed signal and a pitch angle signal of the unit, if the wind speed is greater than a wind speed threshold value and the pitch angle is greater than an angle threshold value, the second signal acquisition module is executed, and if the wind speed is not greater than the wind speed threshold value, the exit strategy module is executed;
the second signal acquisition module is used for acquiring azimuth signals of the blades, and reading azimuth angles of the blades 1 from the azimuth angle sensor after the wind generating set enters a normal power generation modeCalculating azimuth angles +_for blade 2 and blade 3>And->After the blade azimuth angle information is obtained, executing a judging module;
the judging module is used for executing the second interpolation table module if the maximum value of the My limit load of the fixed hub is Mymax overrun, and executing the first interpolation table module if the minimum value of the My limit load of the fixed hub is Mymin overrun;
the first interpolation table module is used for establishing an interpolation table of the azimuth angle-pitch angle of the lower half plane and executing a calculation module according to the result of the interpolation table;
the second interpolation table module is used for establishing an interpolation table of the azimuth angle-pitch angle of the upper half plane and executing a calculation module according to the result of the interpolation table;
the calculation module is used for dynamically calculating the superimposed pitch angle according to the interpolation table result of the azimuth angle and the pitch angle;
the pitch control module controls the value theta according to the existing pitch angle of each blade PIout And the superimposed pitch angle command value of the azimuth FinePitch, determining the final pitch angle control value of each blade;
and exiting the strategy module, and executing a normal power generation mode if the wind speed is not greater than the wind speed threshold value and the pitch angle is greater than the angle threshold value.
8. A storage medium storing a program, wherein the program, when executed by a processor, implements the wind turbine generator set fixed hub My limit load shedding method according to any one of claims 1 to 6.
9. A computing device comprising a processor and a memory for storing a program executable by the processor, wherein the processor, when executing the program stored in the memory, implements the wind turbine stationary hub My limit load shedding method of any one of claims 1 to 6.
CN202311208766.4A 2023-09-19 2023-09-19 Method and system for limiting load reduction of My (My) of fixed hub of wind generating set Pending CN117231418A (en)

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Application Number Priority Date Filing Date Title
CN202311208766.4A CN117231418A (en) 2023-09-19 2023-09-19 Method and system for limiting load reduction of My (My) of fixed hub of wind generating set

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CN117231418A true CN117231418A (en) 2023-12-15

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