CN114876730A - Wind power generator gust load-reducing operation control method - Google Patents

Wind power generator gust load-reducing operation control method Download PDF

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CN114876730A
CN114876730A CN202210503469.1A CN202210503469A CN114876730A CN 114876730 A CN114876730 A CN 114876730A CN 202210503469 A CN202210503469 A CN 202210503469A CN 114876730 A CN114876730 A CN 114876730A
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wind speed
wind
value
measured
cabin
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CN114876730B (en
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王剑利
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Sichuan College of Architectural Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/0204—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor for orientation in relation to wind direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/022—Adjusting aerodynamic properties of the blades
    • F03D7/0224—Adjusting blade pitch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/32—Wind speeds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/321—Wind directions
    • 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 gust load-reducing running control method for a wind driven generator, which comprises the steps of obtaining the measured wind speed at a fan through a laser wind measuring radar; obtaining the wind direction through a wind vane at the top of the cabin, if the deviation between the wind direction measured by the laser wind-measuring radar and the wind direction measured by the wind vane at the top of the cabin is within a set degree, executing a yawing action by taking the wind direction measured by the laser radar as a reference, otherwise, executing the yawing action by taking the wind direction measured by the wind vane at the top of the cabin as a reference, and ensuring that a fan accurately faces the wind; according to the relation between the power of the generator and the torque, an estimated wind speed value is estimated through a Newton iterative algorithm; measuring the wind speed at the cabin of the fan through an anemometer to obtain a measured wind speed value at the cabin, and obtaining a wind speed value at the cabin according to the measured wind speed value and the estimated wind speed value at the cabin; and obtaining a variable pitch compensation coefficient according to the wind speed difference value between the measured wind speed and the wind speed at the engine room, obtaining a variable pitch compensation value according to the variable pitch coefficient, and controlling the fan to change the pitch by the variable pitch controller according to the variable pitch compensation value.

Description

Wind power generator gust load-reducing operation control method
Technical Field
The invention relates to the field of wind power generation, in particular to a control method for gust wind load reduction of a wind driven generator.
Background
At present, the scale of the wind power generation assembly in China has been according to the first in the world, the single machine capacity of the onshore wind turbine of the wind driven generator has been developed to the 6MW grade from the previous 1MW and 1.5MW, the offshore wind turbine has been developed to the 10MW and 12MW, even 16MW grade from the previous 1.5MW and 3MW grade, the increase of the single machine capacity of the wind driven generator also needs to be supported by the increase of the blade length, at present, the blade length of the wind driven generator has been increased to the length of 102 meters, the increase of the blade length of the wind driven generator has larger swinging and swinging problems, so that the wind driven generator faces the problems of larger fatigue load and limit load, the weight and the mechanical strength of a tower barrel are also continuously increased during the design, and thus, the larger design cost is brought, therefore, a load reduction method is needed to be designed, so that the wind driven generator can face the gust problem from the beginning even in gust, and the load of the wind driven generator is effectively reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a wind driven generator gust load-reducing running control method, which comprises the following steps:
acquiring wind speed data and wind direction data at a set distance from a fan of a wind driven generator through a laser wind measuring radar, and obtaining a measured wind speed at the fan according to the wind speed data;
step two, obtaining the wind direction through a wind vane at the top of the cabin, if the deviation between the wind direction measured by the laser wind-measuring radar and the wind direction measured by the wind vane at the top of the cabin is within a set degree, executing a yawing action by taking the wind direction measured by the laser radar as a reference, otherwise, executing the yawing action by taking the wind direction measured by the wind vane at the top of the cabin as a reference, and ensuring that the fan accurately faces the wind;
estimating to obtain an estimated wind speed value through a Newton iterative algorithm according to the relation between the power of the generator and the torque;
measuring the wind speed of the cabin of the fan through an anemometer to obtain a measured wind speed value of the cabin, and obtaining a wind speed value of the cabin according to the measured wind speed value and the estimated wind speed value of the cabin;
and step five, obtaining a variable pitch compensation coefficient according to the wind speed difference value between the measured wind speed and the wind speed at the engine room, obtaining a variable pitch compensation value according to the variable pitch coefficient, and controlling the fan to change the pitch by the variable pitch controller according to the variable pitch compensation value.
Further, the obtaining of the measured wind speed at the wind turbine according to the wind speed data includes the following steps:
the wind speed is calculated as follows:
V LOS1，2 ＝w cosα±u sinα
Figure BDA0003635113560000021
Figure BDA0003635113560000022
Figure BDA0003635113560000023
Figure BDA0003635113560000024
wherein V is the laser radar synthetic wind speed; u is the laser radar tangential wind speed; w is the laser radar axial wind speed; v los1 Is los1 laser beam direction wind speed; v los2 Is los2 laser beam direction wind speed; alpha is the included angle between the los1 laser beam and the los2 laser beam and the axis;
Figure BDA0003635113560000025
obtaining the wind speed V of the laser wind measuring radar for the relative wind direction;
smoothing and filtering the measured wind speed of the laser radar:
Figure BDA0003635113560000026
Figure BDA0003635113560000027
outputting the filtered data of the nth sampling; x n-i The sampled data of the (n-i) th time; n is the average time coefficient, the sliding average value is the measured wind speed, and is marked as V lidar 。
Further, the estimating wind speed value is estimated through a newton iterative algorithm according to the relationship between the power and the torque of the generator, and the method includes the following steps:
from the relationship between generator power and torque, the following calculations can be made:
P＝T generator ×ω
Figure BDA0003635113560000028
In the formula: p is the active power of the wind turbine, T Generator The torque is the pneumatic torque of the wind driven generator, and omega is the rotation angular speed of the wind driven generator; the pneumatic torque can be obtained by actual measurement at the frequency converter, and then the effective wind speed value is estimated according to a Newton iterative algorithm:
Figure BDA0003635113560000029
in the formula, the optimal solution of V is the estimated wind speed value which is marked as V Estimating 。
Further, the wind speed at the cabin of the wind turbine is measured by the anemometer to obtain a measured wind speed value at the cabin, and the wind speed value at the cabin is obtained according to the measured wind speed value at the cabin and the estimated wind speed value, and the following formula is adopted:
wind speed value at nacelle:
V cabin wind speed ＝avg(V Measuring ，V Estimating )。
Further, the method includes the steps of obtaining a variable pitch compensation coefficient according to a wind speed difference value between the measured wind speed and the wind speed at the engine room, obtaining a variable pitch compensation value according to the variable pitch coefficient, and controlling the fan to change the pitch according to the variable pitch compensation value by a variable pitch controller, and includes the following steps:
wind speed V at the nacelle Cabin wind speed And measuring wind speed V by laser radar lidar The absolute value of the wind speed difference between the wind speed difference and the wind speed difference is more than 2m/s, namely gust wind, the gust wind starting value is 5m/s, the feedforward controller obtains a pitch angle feedforward value according to the wind speed, the pitch angle feedforward value is added with the pitch angle output by the PID controller and is used as a pitch angle set value of a pitch changing system, and the pitch control is carried out according to the pitch angle set value; the feedforward controller expression is:
Figure BDA0003635113560000031
the invention has the beneficial effects that: the wind driven generator can effectively reduce the load of the fan and prolong the service life of the fan while keeping good output under the complex meteorological conditions.
Drawings
FIG. 1 is a method for controlling gust wind speed reduction operation of a wind turbine;
FIG. 2 is a schematic diagram of feed forward control;
fig. 3 is a schematic diagram of lidar wind measurement.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
For the purpose of making the object, technical solution and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention. It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
As shown in fig. 1, a method for controlling the wind gust reduction operation of a wind turbine includes the following steps:
acquiring wind speed data and wind direction data at a set distance from a fan of a wind driven generator through a laser wind measuring radar, and obtaining a measured wind speed at the fan according to the wind speed data;
step two, obtaining the wind direction through a wind vane at the top of the cabin, if the deviation between the wind direction measured by the laser wind-measuring radar and the wind direction measured by the wind vane at the top of the cabin is within a set degree, executing a yawing action by taking the wind direction measured by the laser radar as a reference, otherwise, executing the yawing action by taking the wind direction measured by the wind vane at the top of the cabin as a reference, and ensuring that the fan accurately faces the wind;
estimating to obtain an estimated wind speed value through a Newton iterative algorithm according to the relation between the power of the generator and the torque;
measuring the wind speed at the cabin of the fan through an anemometer to obtain a measured wind speed value at the cabin, and obtaining a wind speed value at the cabin according to the measured wind speed value and the estimated wind speed value at the cabin;
and step five, obtaining a variable pitch compensation coefficient according to the wind speed difference value between the measured wind speed and the wind speed at the engine room, obtaining a variable pitch compensation value according to the variable pitch coefficient, and controlling the fan to change the pitch by the variable pitch controller according to the variable pitch compensation value.
The method for obtaining the measured wind speed of the fan according to the wind speed data comprises the following steps:
the wind speed is calculated as follows:
V LOS1，2 ＝w cosα±u sinα
Figure BDA0003635113560000041
Figure BDA0003635113560000042
Figure BDA0003635113560000043
Figure BDA0003635113560000044
wherein V is the laser radar synthetic wind speed; u is the laser radar tangential wind speed; w is the laser radar axial wind speed; v los1 Is los1 laser beam direction wind speed; v los2 Is los2 laser beam direction wind speed; alpha is the included angle between the los1 laser beam and the los2 laser beam and the axis;
Figure BDA0003635113560000045
obtaining the wind speed V of the laser wind measuring radar for the relative wind direction;
smoothing and filtering the measured wind speed of the laser radar:
Figure BDA0003635113560000046
Figure BDA0003635113560000051
outputting the filtered data of the nth sampling; x n-i The sampled data of the (n-i) th time; n is an average time coefficient, the sliding average value is the measured wind speed and is recorded as V lidar 。
According to the relation between the power of the generator and the torque, an estimated wind speed value is estimated through a Newton iterative algorithm, and the method comprises the following steps:
from the relationship between generator power and torque, the following calculations can be made:
P＝T generator ×ω
Figure BDA0003635113560000052
In the formula: p is the active power of the wind turbine, T Generator The torque is the pneumatic torque of the generator, and omega is the rotation angular speed of the generator; the pneumatic torque can be obtained by actual measurement at the frequency converter, and then the effective wind speed value is estimated according to a Newton iterative algorithm:
Figure BDA0003635113560000053
in the formula, the optimal solution of V is the estimated wind speed value which is marked as V Estimating 。
The wind speed at the cabin of the fan is measured by the anemometer to obtain a measured wind speed value at the cabin, and the wind speed value at the cabin is obtained according to the measured wind speed value at the cabin and the estimated wind speed value, and the following formula is adopted:
wind speed value at nacelle:
V cabin wind speed ＝avg(V Measuring ，V Estimating )。
The method comprises the following steps of obtaining a variable pitch compensation coefficient according to a wind speed difference value between a measured wind speed and a wind speed at a cabin, obtaining a variable pitch compensation value according to the variable pitch coefficient, and controlling a fan to change pitch according to the variable pitch compensation value by a variable pitch controller, wherein the variable pitch controller comprises the following processes:
wind speed V at the nacelle Cabin wind speed And measuring wind speed V by laser radar lidar The absolute value of the wind speed difference between the wind speed difference and the wind speed difference is more than 2m/s, namely gust wind, the gust wind starting value is 5m/s, the feedforward controller obtains a pitch angle feedforward value according to the wind speed, the pitch angle feedforward value is added with the pitch angle output by the PID controller and is used as a pitch angle set value of a pitch changing system, and the pitch control is carried out according to the pitch angle set value; feed forward controlThe expression of the device is:
Figure BDA0003635113560000054
specifically, wind speed data is collected and processed, and a 4-beam airborne wind lidar is adopted to measure wind speed and wind direction. The wind speed is calculated as follows:
V Los1，2 ＝w cosα±u sinα
Figure BDA0003635113560000061
Figure BDA0003635113560000062
Figure BDA0003635113560000063
Figure BDA0003635113560000064
and further obtaining the wind speed V measured by the laser radar.
Radar wind speed data processing
The wind speed acquisition frequency of the laser wind radar is 1Hz, and the measured wind speed of the laser radar is subjected to smooth filtering treatment:
Figure BDA0003635113560000065
Figure BDA0003635113560000066
outputting the filtered data of the nth sampling; x n-i The sampled data of the (n-i) th time; n is an average time coefficient, N can be 10 or other values, and the sliding average value is the wind at the position of 100 meters at the front end of the wind wheelVelocity value, denoted V lidar 。
The wind meter is mounted at the tail of the nacelle, but its measurement value (denoted as V) Measuring ) Measurement inaccuracy is caused by the influence of the rotation of the wind wheel; from the relationship between generator power and torque, the following calculations can be made:
P＝T generator ×ω
Figure BDA0003635113560000067
In the formula: p is the active power of the wind turbine, T Generator The torque is the pneumatic torque of the generator, and omega is the rotation angular speed of the generator; the pneumatic torque can be obtained by actual measurement at the frequency converter, and then the effective wind speed value is estimated according to a Newton iterative algorithm:
Figure BDA0003635113560000068
in the formula, the optimal solution of V is the estimated wind speed value which is marked as V Estimating 。
Because the estimated wind speed value can be calculated only in the power generation state, the wind speed measurement installed at the tail of the engine room is required to be included in the control flow to obtain the wind speed value at the engine room:
V cabin wind speed ＝avg(V Measuring ，V Estimating )
Considering that the wind speed is proportional to the power by the power of 3, if the gust opening threshold cannot be defined too large, the wind speed V at the nacelle is Cabin wind speed And measuring wind speed V by laser radar lidar The wind speed difference between the wind speed sensors is more than 2m/s in absolute value, and then gust can be defined. The gust start value may be defined as 5m/s or other parameter values.
Load down line control
1. When the fan is in the incoming flow gust, the gust controls the compensation of the variable pitch speed or the variable pitch angle, and the pitch-retracting speed is 1.2 times of the normal operation speed. Meanwhile, the output amplitude of the variable pitch speed of the gust controller is limited within (-2, +6) DEG/s.
2. If the wind speed is higher than the rated wind speed, judging the gust after starting a threshold value according to the length of a fan blade, the single machine capacity of the whole machine, the characteristics of a variable pitch system and the power characteristics, and if the gust is judged to be coming, reducing the target rotating speed, wherein the target set rotating speed can be properly reduced by 50 rpm. And meanwhile, adjusting the pitch rate and the pitch rate according to a preset coefficient.
3. And designing a feedforward controller, wherein the feedforward controller is used for giving out a proper pitch angle feedforward value according to the wind speed, and adding the appropriate pitch angle feedforward value with the pitch angle output by the PID controller to be used as a pitch angle set value of the pitch-variable system. When the wind speed is increased, the feedforward controller increases the set value of the pitch angle in time, so that the pitch angle is increased, and the wind energy absorbed by the wind wheel is reduced. On the contrary, the feedforward controller reduces the set value of the pitch angle and increases the wind energy absorbed by the wind wheel, thereby maintaining the constant power above the rated wind speed. Designing the feedforward controller expression as:
Figure BDA0003635113560000071
1. measuring wind speed and wind direction information of front end of fan
In the actual operation of the wind turbine, if the wind condition in front of the wind wheel can be obtained, the defects of the traditional wind measuring system can be avoided. Therefore, a coherent Doppler laser radar wind meter with wider application can be selected. The principle is that light emitted by laser is reflected by small particles, pollen, dust and water drops in the air, the movement speed and the direction of the small particles can be calculated by utilizing the laser Doppler effect, and the movement speed of the small particles is the same as the movement and the change direction of wind, so that the measured wind condition is represented. The laser anemometer emits 4 beams of laser which form an included angle of 30 degrees with the central axis of the wind wheel respectively, the 4 beams of laser measure the wind speed and the wind direction at the position of 100m, and then the wind speed and the wind direction at the position of 100m in front of the wind wheel are synthesized in a vector mode.
2. Logic design
2.1 calculating the wind speed and the wind direction at the position of 100 meters at the front end of the wind wheel;
2.2 if the deviation between the wind direction measured by the laser radar and the wind direction measured by the wind vane at the top of the cabin is within 10 degrees, performing yawing motion by taking the wind direction measured by the laser radar as a reference, or performing yawing motion by taking the wind direction measured by the wind vane at the top of the cabin as a reference, ensuring that the fan accurately faces the wind, and reducing the load of the fan;
2.3 calculating an anemometer at the top of the cabin and predicting the wind speed reduced wind speed;
2.4 calculating a variable pitch compensation coefficient according to the wind speed deviation;
2.5, properly reducing the current variable pitch angle, wherein the reduction value is the ratio of the wind speed difference of the cabin wind speed and the radar position to the time t, and multiplying the ratio by a proper coefficient;
Figure BDA0003635113560000081
target pitch angle is equal to current pitch angle multiplied by k multiplied by t
Wherein k is a correction coefficient.
2.6 the current pitch speed should be increased by 1.2 times (or other design parameters);
2.7 speed control
When the deviation between the wind speed at the front end of the fan and the wind speed at the fan is larger than 3m/s (or other set parameters), the calculated variable pitch compensation value is sent to a variable pitch controller, the requirement of a variable pitch position calculated by the variable pitch control main controller is focused on unloading power, and meanwhile, the target rotating speed of the variable pitch control is reduced by 50rpm (or other set parameters).
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (5)

1. A wind power generator gust load-dropping operation control method is characterized by comprising the following steps:
acquiring wind speed data and wind direction data at a set distance from a fan of a wind driven generator through a laser wind measuring radar, and obtaining a measured wind speed at the fan according to the wind speed data;
step two, obtaining the wind direction through a wind vane at the top of the cabin, if the deviation between the wind direction measured by the laser wind-measuring radar and the wind direction measured by the wind vane at the top of the cabin is within a set degree, executing a yawing action by taking the wind direction measured by the laser radar as a reference, otherwise, executing the yawing action by taking the wind direction measured by the wind vane at the top of the cabin as a reference, and ensuring that the fan accurately faces the wind;
estimating to obtain an estimated wind speed value through a Newton iterative algorithm according to the relation between the power of the generator and the torque;
measuring the wind speed at the cabin of the fan through an anemometer to obtain a measured wind speed value at the cabin, and obtaining a wind speed value at the cabin according to the measured wind speed value and the estimated wind speed value at the cabin;
and step five, obtaining a variable pitch compensation coefficient according to the wind speed difference value between the measured wind speed and the wind speed at the engine room, obtaining a variable pitch compensation value according to the variable pitch coefficient, and controlling the fan to change the pitch by the variable pitch controller according to the variable pitch compensation value.
2. The method for controlling the gust wind speed reduction operation of the wind power generator according to claim 1, wherein the step of obtaining the measured wind speed at the wind turbine based on the wind speed data comprises the following steps:
the wind speed is calculated as follows:
V LOS1，2 ＝w cosα±u sinα
Figure FDA0003635113550000011
Figure FDA0003635113550000012
Figure FDA0003635113550000013
Figure FDA0003635113550000014
wherein V is the laser radar synthetic wind speed; u is the laser radar tangential wind speed; w is the laser radar axial wind speed; v los1 Is los1 laser beam direction wind speed; v los2 Is los2 laser beam direction wind speed; alpha is the included angle between the los1 laser beam and the los2 laser beam and the axis;
Figure FDA0003635113550000015
obtaining the wind speed V of the laser wind measuring radar for the relative wind direction;
smoothing and filtering the measured wind speed of the laser radar:
Figure FDA0003635113550000016
Figure FDA0003635113550000017
outputting the filtered data of the nth sampling; x n-i Sampling data of the nth-i times; n is the average time coefficient, the sliding average value is the measured wind speed, and is marked as V lidar 。
3. The method for controlling the gust wind speed reduction of the wind driven generator according to claim 1, wherein the estimation of the wind speed value according to the relation between the power and the torque of the generator by means of the Newton iterative algorithm comprises the following steps:
from the relationship between generator power and torque, the following calculations can be made:
P＝T generator ×ω
Figure FDA0003635113550000021
In the formula: p is the active power of the wind turbine, T Generator The torque is the pneumatic torque of the generator, and omega is the rotation angular speed of the generator; the pneumatic torque can be obtained by actual measurement at the frequency converter, and then the effective wind speed value is estimated according to a Newton iterative algorithm:
Figure FDA0003635113550000022
in the formula, the optimal solution of V is the estimated wind speed value which is marked as V Estimating 。
4. The method for controlling the gust carrier of the wind turbine according to claim 1, wherein the wind speed at the nacelle of the wind turbine is measured by an anemometer to obtain a measured wind speed value at the nacelle, and the wind speed value at the nacelle is obtained according to the measured wind speed value and the estimated wind speed value at the nacelle by using the following formula:
wind speed value at nacelle:
V cabin wind speed ＝avg(V Measuring ,V Estimating )。
5. The wind power generator gust load shedding control method according to claim 1, wherein the method comprises the following steps of obtaining a variable pitch compensation coefficient according to a wind speed difference between a measured wind speed and a wind speed at a cabin, obtaining a variable pitch compensation value according to the variable pitch coefficient, and controlling a fan to change a pitch according to the variable pitch compensation value by a variable pitch controller:
wind speed V at engine room Cabin wind speed And measuring wind speed V by laser radar lidar The absolute value of the wind speed difference between the two is more than 2m/s, namely gust, the gust starting value is 5m/s, the feedforward controller obtains a pitch angle feedforward value according to the wind speed, the pitch angle feedforward value is added with the pitch angle output by the PID controller to be used as a pitch angle set value of the pitch-variable system, and the propeller is driven according to the pitch angle set valueDistance control; the feedforward controller expression is:
Figure FDA0003635113550000023
CN202210503469.1A 2022-05-09 2022-05-09 Wind power generator gust descending operation control method Active CN114876730B (en)

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