CN116538027A - State evaluation method of wind generating set, controller and wind generating set - Google Patents

State evaluation method of wind generating set, controller and wind generating set Download PDF

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Publication number
CN116538027A
CN116538027A CN202310582225.1A CN202310582225A CN116538027A CN 116538027 A CN116538027 A CN 116538027A CN 202310582225 A CN202310582225 A CN 202310582225A CN 116538027 A CN116538027 A CN 116538027A
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CN
China
Prior art keywords
power
bending moment
generating set
root bending
wind
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CN202310582225.1A
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Chinese (zh)
Inventor
王大为
张迪
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Priority to CN202310582225.1A priority Critical patent/CN116538027A/en
Publication of CN116538027A publication Critical patent/CN116538027A/en
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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
    • 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
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • 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
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/20—Wind motors characterised by the driven apparatus
    • F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
    • 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

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Wind Motors (AREA)

Abstract

The disclosure provides a state evaluation method of a wind generating set, a controller and the wind generating set. The state evaluation method comprises the following steps: obtaining a blade root bending moment of a wind generating set; obtaining aerodynamic torque according to the blade root bending moment; obtaining impeller absorption power based on the product of aerodynamic torque, impeller rotation speed of the wind generating set and predetermined blade absorption efficiency; obtaining first power according to the product of the impeller absorption power and the preset unit efficiency; and evaluating the state of the wind generating set according to the first power and the actual output power or grid-connected power of the wind generating set. The state evaluation method according to the embodiment of the disclosure can judge whether the unit has an abnormal state of accumulating excessive energy.

Description

State evaluation method of wind generating set, controller and wind generating set
Technical Field
The present disclosure relates generally to the field of wind power, and more particularly, to a state evaluation method of a wind turbine generator system, a controller, and a wind turbine generator system.
Background
The installed capacity of the wind power plant rises year by year, the wind power plant is also more and more widely distributed, the power generation proportion of wind power is larger and larger, and the wind power gradually becomes a conventional energy source. The operation state of the wind generating set (also simply called a fan, a set or a wind generating set) is monitored so as to obtain the operation state data of the wind generating set, accurate protection control can be performed according to the measured high-precision operation state data, and meanwhile, the state monitoring or state evaluation provides reliable basis for safety control and stability evaluation of the wind generating set.
Currently, operational state data of rotational speed, vibration, power of a unit are obtained by installing sensors for core components such as impellers, blades, nacelle, tower, generator, gearbox, etc. Although the unit state data can be accurately acquired through high-precision sensors and algorithms, the power actually absorbed by the impeller from the wind is generally estimated through the rotation speed of the impeller, the rotational inertia of the impeller, the electromagnetic torque of the generator and the efficiency of the whole transmission chain, and the estimation method takes the assumption that the energy absorbed by the impeller is used for accelerating or decelerating the impeller except a transmission power grid as a premise, so that whether other equipment bears the partial energy to cause damage cannot be known in practice. The existing power prediction and assessment method can be referred to two Chinese patent documents with application publication number of CN109783828A and CN 102693457A.
In addition, the aerodynamic torque Ta is calculated through wind speed, air density, blade length and the like, and then the wind energy absorbed by the impeller can be obtained through multiplication of the impeller rotating speed, but the instability of wind speed and the tower shadow effect cause certain deviation in the aerodynamic torque estimation.
Disclosure of Invention
It is an object of exemplary embodiments of the present disclosure to provide a state evaluation method capable of judging whether a state of a wind turbine generator set is abnormal.
According to a first aspect of the present disclosure, a method for evaluating a state of a wind turbine generator set, comprises: obtaining a blade root bending moment of a wind generating set; obtaining aerodynamic torque according to the blade root bending moment; obtaining impeller absorption power based on the product of aerodynamic torque, impeller rotation speed of the wind generating set and blade absorption efficiency; obtaining first power according to the product of the absorption power of the impeller and the efficiency of the unit; and evaluating the state of the wind generating set according to the first power and the actual output power or grid-connected power of the wind generating set.
According to an embodiment of the present disclosure, the step of obtaining a root bending moment of the wind park may comprise: obtaining a first driving current of a first variable pitch motor of the wind generating set; obtaining a first motor driving torque according to the first driving current and a first current torque coefficient ratio of the first variable pitch motor; obtaining a first blade root bending moment of the wind generating set according to the product of the first motor driving torque, the first pitch motor mechanical efficiency, the first pitch mechanical transmission efficiency and the first pitch speed reducer reduction ratio; the root bending moment is determined from the first root bending moment.
According to embodiments of the present disclosure, the first pitch mechanical transmission efficiency may be determined from a product of the first pitch reduction gear rotational efficiency and the first pitch reduction gear transmission efficiency.
According to an embodiment of the present disclosure, the step of determining the root bending moment from the first root bending moment may comprise: respectively obtaining a second blade root bending moment and a third blade root bending moment of the wind generating set; the first, second and third blade root bending moments are averaged and the average is taken as the blade root bending moment.
According to an embodiment of the present disclosure, the step of obtaining aerodynamic torque from the root bending moment may comprise: aerodynamic torque is obtained according to the product of the blade root bending moment and the correction coefficient.
According to an embodiment of the present disclosure, the correction coefficient may be obtained by: measuring a first pneumatic torque of a wind generating set prototype through a torque sensor and obtaining a blade root bending moment average value of three blades of the wind generating set prototype; and performing curve fitting or linear regression analysis on the first aerodynamic torque and the blade root bending moment average value to obtain a correction coefficient.
According to embodiments of the present disclosure, the unit efficiency may be determined by the product of the four of the generator mechanical efficiency, the generator electrical efficiency, the electrical drive train efficiency, and the mechanical drive train efficiency of the wind turbine unit.
According to an embodiment of the present disclosure, the state evaluation method may further include: the blade tip speed ratio, the blade simulation parameters and the pitch angle of the wind generating set are obtained, and the blade absorption efficiency is determined according to the blade tip speed ratio, the blade simulation parameters, the pitch angle and a predetermined blade absorption efficiency model.
According to an embodiment of the present disclosure, the step of evaluating the state of the wind turbine from the first power and the actual output power or grid-connected power of the wind turbine may comprise: and determining that the wind generating set is in an abnormal state in response to the absolute value of the difference between the first power and the actual output power or the grid-connected power being greater than or equal to a first preset threshold value and lasting for a first preset time, or the absolute value being greater than or equal to a second preset threshold value, being smaller than the first preset threshold value and lasting for a second preset time, wherein the first preset threshold value is greater than the second preset threshold value, and the first preset time is smaller than the second preset time.
According to a second aspect of the present disclosure, a computer-readable storage medium stores instructions or a program that when executed by a processor implements the above-described method of evaluating a state of a wind turbine generator set.
According to a third aspect of the present disclosure, a state evaluation device of a wind turbine generator set includes: the blade root bending moment acquisition unit is used for acquiring the blade root bending moment of the wind generating set; the first calculation unit obtains pneumatic torque according to the blade root bending moment, and the second calculation unit obtains impeller absorption power based on the product of the pneumatic torque, the impeller rotating speed of the wind generating set and the blade absorption efficiency; the third calculation unit is used for obtaining first power according to the product of the absorption power of the impeller and the efficiency of the unit; and the evaluation unit is used for evaluating the state of the wind generating set according to the first power and the actual output power or grid-connected power of the wind generating set.
According to a fourth aspect of the present disclosure, a controller for a wind power generation set comprises: a processor and a computer readable storage medium storing a program or instructions which when executed by the processor implement the above-described method of evaluating the state of a wind turbine generator set.
According to a fifth aspect of the present disclosure, a wind power generator set comprises: the state evaluation device or the controller.
The method and the device can be used for pre-judging whether a large amount of energy is accumulated in the machine set in advance by comparing the calculated power with the generated power according to the principle of energy conservation, so that local overheating or mechanical damage caused by excessive energy accumulation in the machine set is avoided.
Additional aspects and/or advantages of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.
Drawings
The foregoing and other objects and features of exemplary embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings which illustrate the embodiments by way of example, in which:
fig. 1 is a flowchart showing a state evaluation method according to a first embodiment of the present disclosure;
fig. 2 is a flowchart illustrating a state evaluation method according to a second embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a state evaluation method according to a third embodiment of the present disclosure;
fig. 4 is a graph showing blade absorption efficiency according to a fourth embodiment of the present disclosure;
fig. 5 is a block diagram showing a state evaluation device according to a first embodiment of the present disclosure;
fig. 6 is a block diagram illustrating a controller according to a first embodiment of the present disclosure.
Detailed Description
The following detailed description is provided to help gain a comprehensive understanding of the methods, apparatus, and/or systems described herein. However, the order of the operations described herein is merely an example and is not limited to those set forth herein, but equivalent substitutions or changes may be made in addition to operations that must occur or be performed in a specific order. In addition, descriptions of the contents well known in the art will be omitted or simplified for the sake of clarity and conciseness.
Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs after understanding this disclosure. Unless explicitly so defined herein, terms (such as those defined in a general dictionary) should be construed to have meanings consistent with their meanings in the context of the relevant art and the present disclosure, and should not be interpreted idealized or overly formal.
Unless specifically stated otherwise, like numbers generally refer to like elements (e.g., components, steps, and methods). The reference numerals described in the previous embodiments, which are again present in the latter embodiments, may be omitted. In addition, technical features described in different or the same embodiment may be combined in any manner as long as the combined embodiment or technical solution is complete and can solve the technical problem of the present application or realize the technical effect described or not described in the present application but can be determined according to the complete technical solution.
The present disclosure determines blade root bending moment M based on a pitch system z Bending moment M of blade root z (e.g. root bending moment M of three blades z Average value of (f) and other parameters of the unit are combined to obtain the absorption power of the impeller. Under normal circumstances, considering the efficiency of the whole machine, the power absorbed by the unit (i.e. the power absorbed by the impeller) should be matched with the power generated, and if the power absorbed by the impeller is significantly higher than the power generated for a long time, there may be a certain component or components in the unit that are subjected to too high energy, which may cause damage to those components.
The method comprises the steps of obtaining aerodynamic bending moment according to blade root bending moment, estimating output power or power generation power of a unit according to aerodynamic bending moment, impeller rotating speed and efficiency of the unit, comparing the estimated output power or power generation power of the unit with actual power generation power, and judging whether abnormal conditions of excessive energy siltation in the unit exist according to comparison results. If it is determined that the unit has the abnormal condition, the unit can be controlled to stop and the subsequent check is performed. Specific embodiments of the present disclosure will be described below in conjunction with fig. 1-6.
Fig. 1 is a flowchart illustrating a state evaluation method according to a first embodiment of the present disclosure, fig. 2 is a flowchart illustrating a state evaluation method according to a second embodiment of the present disclosure, fig. 3 is a flowchart illustrating a state evaluation method according to a third embodiment of the present disclosure, and fig. 4 is a graph illustrating a blade absorption efficiency according to a fourth embodiment of the present disclosure.
Referring to fig. 1, a state evaluation method according to a first embodiment of the present disclosure may include: step S110, step S120, step S130, step S140, and step S150.
In step S110, a root bending moment M of the wind turbine is obtained z 。
The inner ring of the pitch bearing of the wind power plant may be connected to the drive motor of the pitch system, the outer ring of the pitch bearing may be connected to the root of the blade (i.e. the blade root), as an example, the blade root bending moment M may be measured by a sensor z 。
At measuring blade root bending moment M z In the condition that the sensor of the pitch control system is inconvenient to install, the blade root bending moment M can be determined through the driving current of the pitch motor z 。
Specifically, referring to fig. 3, the step S110 of obtaining the root bending moment of the wind turbine may include: step S111, step S112, step S113, and step S114.
The wind generating set may include three pitch motors, namely a first pitch motor driving a first blade to pitch, a second pitch motor driving a second blade to pitch, and a third pitch motor driving a third blade to pitch.
In step S111, a first drive current of a first pitch motor of the wind park is obtained.
The first driving current of the first pitch motor can be obtained by additionally installing a corresponding current sensor for monitoring, and can also be directly obtained from the detection parameters of the related sensors of the original pitch controller or obtained by conversion based on the detection parameters.
In step S112, a first motor drive torque T is obtained from the first drive current and a first current-torque coefficient ratio of the first pitch motor p 。
The current-torque coefficient ratio (first current-torque coefficient ratio, second current-torque coefficient ratio, third current-torque coefficient ratio) of each pitch motor may be calibrated in advance, that is, the ratio between the drive current and the torque of the pitch motor (current-torque coefficient ratio) may be predetermined, and the motor drive torque T of each pitch motor may be obtained with the pitch drive current and the current-torque coefficient ratio known p 。
In step S113, according to the first motor driving torque T p Mechanical efficiency eta of the first pitch motor p First pitch mechanical transmission efficiency Ratio P And obtaining a first blade root bending moment of the wind generating set by multiplying the four reduction ratios i of the first pitch reduction gear. Specifically, the following formula (1) can be referred to.
M z ＝η p * T p * Ratio P * i (1)
In step S114, the root bending moment is determined based on the first root bending moment.
As an example, the first root bending moment may be determined directly as the root bending moment of the wind park.
In addition, the second pitch motor and the third pitch motor may be used as references to obtain the blade root bending moment. For example, the second blade root bending moment of the wind generating set may be obtained according to a product of the second motor driving torque, the second pitch motor mechanical efficiency, the second pitch mechanical transmission efficiency and the second pitch reduction gear reduction ratio. Of course, the third blade root bending moment of the wind park may also be obtained in a similar way.
The blade root bending moment of the wind generating set may be determined according to the second blade root bending moment and/or the third blade root bending moment, at least two of the first blade root bending moment, the second blade root bending moment, the third blade root bending moment may be averaged, and the obtained average value may be determined as the blade root bending moment of the wind generating set. As an example, the root bending moment may be an average of the root bending moments of three blades.
Pitch motor mechanical efficiency η associated with pitch system of each blade p Variable pitch mechanical transmission efficiency Ratio P The speed reduction ratio i of the variable pitch speed reducer can be directly determined according to the parameters of the corresponding variable pitch system. That is, the mechanical efficiency η of the pitch motor p Variable pitch mechanical transmission efficiency Ratio P The reduction ratio i of the variable pitch speed reducer can be predetermined.
The transmission efficiency of the pitch mechanism can be determined according to the product of the rotation efficiency of the pitch reducer and the transmission efficiency of the pitch reducer. Specifically, the product of the pitch reduction rotational efficiency (e.g., the first pitch reduction rotational efficiency corresponding to the first pitch motor) and the pitch reduction transmission efficiency (e.g., the first pitch reduction transmission efficiency corresponding to the first pitch motor) may be directly determined as the pitch mechanical transmission efficiency (e.g., the first pitch mechanical transmission efficiency corresponding to the first pitch motor). The second pitch mechanical transmission efficiency may also be determined based on a product of a second pitch reduction rotational efficiency corresponding to the second pitch motor and a second pitch reduction transmission efficiency corresponding to the second pitch motor. The third pitch mechanical transmission efficiency may also be determined in a similar manner.
Referring to FIG. 1, in step S120, aerodynamic torque is obtained from the root bending moment.
The step of obtaining aerodynamic torque from the root bending moment may comprise: obtaining pneumatic torque T according to the product of blade root bending moment and correction coefficient C a . The specific mode of obtaining is represented by the following formula (2).
T a ＝C * M z (2)
The correction factor may be a predetermined constant and the correction factor C may be obtained based on a prototype of the wind park. In particular, it can be obtained by the following means:
and measuring the first pneumatic torque of the wind generating set prototype through a torque sensor, obtaining the blade root bending moment average value of three blades of the wind generating set prototype, and performing curve fitting or linear regression analysis on the first pneumatic torque and the blade root bending moment average value to obtain a correction coefficient C.
That is, a functional relationship between aerodynamic torque and blade root bending moment can be obtained in advance, and in combination with the functional relationship, aerodynamic torque can be directly obtained without calculating aerodynamic torque T from blade wind speed, air density, blade length, etc. when blade root bending moment is known a And the influence of the instability of wind speed and the tower shadow effect on the estimation precision is reduced.
In addition, the state evaluation method disclosed by the invention does not need to install a torque sensor for each wind generating set, so that the cost can be reduced. In another aspect, the aerodynamic torque T of the present disclosure a From the bending moment M of the blade root z Converted into a blade root bending moment M z The blade root bending moment measuring device is calculated by the driving current of the pitch motor, so that a sensor for measuring the blade root bending moment does not need to be installed.
Referring to fig. 1, in step S130, based on the aerodynamic torque T a Impeller rotation speed omega and blade absorption efficiency C of wind generating set p The product of the three components obtains the impeller absorption power P 1 。
As an example, the aerodynamic torque T can be directly applied a Impeller speed Ω of a wind turbine generator system and predetermined blade absorption efficiency C p The product of the three is determined as the impeller absorption power P 1 . The specific calculation method is as shown in the following formula (3).
P 1 ＝ Ω* T a *C p (3)
The impeller speed Ω can be obtained by means of an associated detection sensor. Regarding blade absorption efficiency C p Can be determined according to a predetermined blade absorption efficiency model. The blade absorption efficiency model can be a model about the tip speed ratio, the blade simulation parameters and the pitch angle, and the blade absorption efficiency C can be determined according to the obtained tip speed ratio, the blade simulation parameters and the pitch angle and a predetermined blade absorption efficiency model p 。
Thus, a state evaluation method according to an embodiment of the present disclosure may further include: obtaining the tip speed ratio, blade simulation parameters (including blade airfoil, length and the like) and pitch angle of the wind generating set.
The tip speed ratio can be determined according to the ratio of the tip speed of the blade (which can be calculated by the impeller rotating speed and the length of the blade) to the wind speed (which can be measured by a crosswind system), the blade simulation parameters can be determined according to the actual physical parameters of the blade, the pitch angle can be obtained according to a rotary encoder, or can be obtained from a control instruction of a pitch system.
Referring specifically to fig. 4, from fig. 4, it is possible to obtain the blade absorption efficiencies of the same airfoil, the same tip speed ratio, and different pitch angles (0 °, 2 °, 3 °, … …), or to obtain the blade absorption efficiencies of the same airfoil, the same pitch angle, and different tip speed ratios.
In step S140, a first power P is obtained from the product of the impeller absorption power and the unit efficiency eta 2 . Specifically, it can be obtained by the following formula (4):
P 2 ＝ η * P 1 (4)
that is, the impeller can directly absorb the power P 1 And the product of the predetermined unit efficiency eta is directly determined as the first power P 2 . First power P 2 Can be understood as theoretical power if the first power P 2 Far greater than the generated power, it means that a lot of energy is deposited in the unit.
Specifically, in step S150, the state of the wind turbine generator set is evaluated based on the first power and the actual output power or grid-connected power of the wind turbine generator set.
As an example, according to the first power P 2 And judging whether the wind generating set is in an abnormal state of accumulating a large amount of energy in the wind generating set according to the ratio of the actual output power or the grid-connected power P of the wind generating set.
Specifically, when the ratio is greater than or equal to a first threshold value and lasts for a first time, or the ratio is greater than or equal to a second threshold value, less than the first threshold value and lasts for a second time, determining that the wind generating set is in an abnormal state, wherein the first threshold value is greater than the second threshold value, and the first time is less than the second time.
That is, when the above ratio is large (for example, greater than 1.1 and less than 1.2) and the duration is long, it may be determined that the wind turbine generator set is in an abnormal state. In addition, when the above ratio is larger (for example, 1.2 or more) but the duration is short, it is also possible to determine that the wind turbine generator set is in an abnormal state.
In addition, the first power P 2 And judging the difference with the actual output power or the grid-connected power P of the wind generating set. Referring to fig. 2, step S150 may include step S151 and step S152.
In step S151, it is determined whether the absolute value |ΔP| of the difference between the first power and the actual output power or the grid-connected power is greater than or equal to the first predetermined threshold value P t1 And last for a first predetermined time T 1 Or whether the absolute value |Δp| is greater than or equal to a second predetermined threshold value P t2 Less than a first predetermined threshold P t1 And last for a second predetermined time T 2 Wherein the first predetermined threshold value P t1 Greater than a second predetermined threshold P t2 A first preset time T 1 Less than a second predetermined time T 2 。
In step S152, if the above condition is satisfied, it may be determined that the wind turbine generator set is in an abnormal state.
That is, the step of evaluating the state of the wind power plant based on the first power and the actual output power or grid-connected power of the wind power plant comprises: responsive to the absolute value |ΔP| of the difference between the first power and the actual output power or grid-tied power being greater than or equal to a first predetermined threshold value P t1 And last for a first predetermined time T 1 Or the absolute value is greater than or equal to a second predetermined threshold P t2 Less than a first predetermined threshold P t1 And last for a second predetermined time T 2 Determining that the wind generating set is in an abnormal state, wherein a first preset threshold value P t1 Greater than a second predetermined threshold P t2 A first preset time T 1 Less than a second predetermined time T 2 。
When it is determined that the wind power plant is in the above-described abnormal state, the wind power plant may be controlled to stop, and which components of the wind power plant may be further checked for energy fouling (e.g., may be judged by way of heat generation).
The unit efficiency eta can be determined by the product of the mechanical efficiency, the electrical transmission chain efficiency and the mechanical transmission chain efficiency of the generator of the wind generating unit. The mechanical efficiency of the generator, the electrical drive train efficiency and the mechanical drive train efficiency may all be determined based on information about electrical parameters of the relevant components of the unit, i.e. all four may be predetermined.
Fig. 5 is a block diagram showing a state evaluation device according to a first embodiment of the present disclosure, and fig. 6 is a block diagram showing a controller according to the first embodiment of the present disclosure.
Referring to fig. 5, a state evaluation device 500 according to a first embodiment of the present disclosure may include: a root bending moment acquisition unit 510, a first calculation unit 520, a second calculation unit 530, a third calculation unit 540 and an evaluation unit 550.
The blade root bending moment obtaining unit 510 may obtain a blade root bending moment of the wind generating set, and as described above, the blade root bending moment obtaining unit 510 may determine the blade root bending moment according to a motor driving bending moment, and the motor driving bending moment may be obtained by calculating according to a driving current of the variable pitch motor.
Specifically, the root bending moment acquisition unit 510 may be configured to: obtaining a first driving current of a first pitch motor of the wind generating set, obtaining a first motor driving torque according to the first driving current and a first current torque coefficient ratio of the first pitch motor, obtaining a first blade root bending moment of the wind generating set according to a product of the first motor driving torque, a predetermined first pitch motor mechanical efficiency, a predetermined first pitch mechanical transmission efficiency and a predetermined first pitch reduction gear reduction ratio, and determining the blade root bending moment according to the first blade root bending moment.
The root bending moment acquisition unit 510 may directly determine the first root bending moment as the root bending moment of the wind turbine. As an example, the blade root bending moment obtaining unit 510 may take an average of the first blade root bending moment, the second blade root bending moment, and the third blade root bending moment as the blade root bending moment of the wind generating set.
The root bending moment acquisition unit 510 may be configured to: aerodynamic torque is obtained from the product of the root bending moment and a predetermined correction factor. Specifically, the blade root bending moment obtaining unit may measure a first aerodynamic torque of a wind turbine generator system prototype through a torque sensor and obtain blade root bending moment average values of three blades of the wind turbine generator system prototype, and perform curve fitting or linear regression analysis on the first aerodynamic torque and the blade root bending moment average values to obtain a correction coefficient. The blade root bending moment and the aerodynamic torque can also be calibrated to form a mapping table, and the aerodynamic torque can be determined by a table look-up mode under the condition that the blade root bending moment is known. Similarly, the root bending moment may be obtained in a similar manner, with the root bending moment being determined by means of a look-up table given the motor drive current.
The first computing unit 520 may obtain aerodynamic torque based on the root bending moment. The first calculation unit 520 may determine aerodynamic torque based on the product of the root bending moment and the correction factor.
The second calculation unit 530 may obtain the impeller absorption power based on a product of aerodynamic torque, an impeller speed of the wind turbine, and a predetermined blade absorption efficiency.
The third calculation unit 540 may obtain the first power from a product of the impeller absorption power and a predetermined unit efficiency.
As an example, the calculation steps of the formulas (1) to (4) described above may be performed by a single calculation unit, and the formulas (1) to (4) may be combined and calculated to obtain the first power. Wherein the unit efficiency may be determined by a product of a predetermined generator mechanical efficiency, a predetermined generator electrical efficiency, a predetermined electrical drive train efficiency, and a predetermined mechanical drive train efficiency of the wind turbine generator unit. As an example, the product of the four above may be determined directly as the unit efficiency.
The evaluation unit 550 may evaluate the state of the wind turbine based on the first power and the actual output power or the grid-connected power of the wind turbine.
Specifically, the evaluation unit 550 may be configured to: responsive to the absolute value |ΔP| of the difference between the first power and the actual output power or grid-tied power being greater than or equal to a first predetermined threshold value P t1 And last for a first predetermined time T 1 Or have a large absolute valueAt or equal to a second predetermined threshold value P t2 Less than a first predetermined threshold P t1 And last for a second predetermined time T 2 Determining that the wind generating set is in an abnormal state, wherein a first preset threshold value P t1 Greater than a second predetermined threshold P t2 A first preset time T 1 Less than a second predetermined time T 2 。
That is, when the above absolute value is large and the duration is long, it may be determined that the wind turbine generator set is in an abnormal state. In addition, when the absolute value is larger but the duration is shorter, it is also possible to determine that the wind turbine is in an abnormal state. The threshold or predetermined threshold as described above may be greater than the self-power consumption of the unit (the sum of the power consumption of the self-power consumption (e.g., pitch system, crosswind system, etc.).
It should be understood that each unit or module in the control device according to the exemplary embodiments of the present disclosure may be implemented as a hardware component and/or a software component. Those skilled in the art may implement the various units in accordance with the processes performed by the defined various units, for example, using Field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), software algorithms, and the like.
Various operations of the above-described steps may be written as software programs or instructions, and thus, a control method according to an exemplary embodiment of the present disclosure may be implemented via software, and a computer-readable storage medium of an exemplary embodiment of the present disclosure may store a computer program that, when executed by a processor, implements a state evaluation method as described in the above-described exemplary embodiment.
According to various embodiments of the present disclosure, an apparatus (e.g., a module or their functions) or method may be implemented by a program or instructions stored in a computer-readable storage medium. Where the instruction is executed by a processor, the processor may perform a function corresponding to the instruction or perform a method corresponding to the instruction. At least a portion of the modules may be implemented (e.g., executed) by a processor. At least a portion of the programming modules may include modules, programs, routines, instruction sets, and procedures for performing at least one function. In one example, the instructions or software include machine code (such as machine code produced by a compiler) that is directly executed by one or more processors or computers. In another example, the instructions or software include higher-level code that is executed by one or more processors or computers using an interpreter. The instructions or software may be written using any programming language based on the block diagrams and flowcharts shown in the figures and the corresponding descriptions in the specification.
The computer-readable storage medium includes non-transitory computer-readable storage media, which may include, for example, magnetic media such as floppy disks and magnetic tapes, optical media including Compact Disk (CD) ROMs, and DVD ROMs, magneto-optical media such as floppy disks, hardware devices such as ROMs, RAMs, and flash memories designed to store and execute program commands. The program commands include language code executable by a computer using an interpreter and machine language code generated by a compiler. The hardware means described above may be implemented by one or more software modules for performing the operations of the various embodiments of the present disclosure.
The modules or programming modules of the present disclosure may include at least one of the foregoing components with some components omitted or other components added. The operations of the modules, programming modules, or other components may be performed sequentially, in parallel, in a loop, or heuristically. Moreover, some operations may be performed in a different order, omitted, or expanded with other operations.
The computer-readable storage medium and/or the state evaluation device of the exemplary embodiments of the present disclosure may be part of a controller (e.g., a master controller) of a wind turbine generator system.
For example, referring to fig. 6, a controller 600 according to an exemplary embodiment of the present disclosure may include: a processor 620 and a computer readable storage medium 630, wherein the computer readable storage medium 630 stores a computer program or instructions which, when executed by the processor 620, implement the state evaluation method as described in the above exemplary embodiments.
The wind power generation set of embodiments of the present disclosure may include a computer readable storage medium, a state evaluation device, or a controller as described above.
According to the state evaluation method and the state evaluation device, whether the wind generating set has an abnormal state of energy accumulation or not can be accurately judged.
According to the state evaluation method and the state evaluation device, a blade root bending moment sensor and the like are not needed, and cost can be reduced.
The method and the device can be used for pre-judging whether a large amount of energy is accumulated in the machine set in advance by comparing the calculated power with the generated power according to the principle of energy conservation, so that local overheating or mechanical damage caused by excessive energy accumulated in the machine set is avoided.
Although a few exemplary embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents, e.g., the technical features of the different embodiments may be combined.

Claims (13)

1. A method for evaluating the state of a wind turbine generator system, comprising:
obtaining a blade root bending moment of the wind generating set;
obtaining aerodynamic torque according to the blade root bending moment;
obtaining impeller absorption power based on the product of the aerodynamic torque, the impeller rotating speed of the wind generating set and the blade absorption efficiency;
obtaining first power according to the product of the absorption power of the impeller and the efficiency of the unit;
and evaluating the state of the wind generating set according to the first power and the actual output power or grid-connected power of the wind generating set.
2. The method for evaluating the state of a wind turbine according to claim 1, wherein the step of obtaining a root bending moment of the wind turbine comprises:
obtaining a first driving current of a first variable pitch motor of the wind generating set;
obtaining a first motor driving torque according to the first driving current and a first current torque coefficient ratio of the first variable pitch motor;
obtaining a first blade root bending moment of the wind generating set according to the product of the first motor driving torque, the first pitch motor mechanical efficiency, the first pitch mechanical transmission efficiency and the first pitch speed reducer reduction ratio;
and determining the blade root bending moment according to the first blade root bending moment.
3. The method of claim 2, wherein the first pitch mechanical transmission efficiency is determined from a product of a first pitch reduction gear rotational efficiency and a first pitch reduction gear transmission efficiency.
4. The method of state assessment of a wind turbine of claim 2, wherein determining the root bending moment from the first root bending moment comprises:
respectively obtaining a second blade root bending moment and a third blade root bending moment of the wind generating set;
averaging the first, second and third blade root bending moments and taking the average as the blade root bending moment.
5. The method for evaluating the condition of a wind power plant according to any one of claims 1 to 4, wherein the step of obtaining aerodynamic torque from the root bending moment comprises: and obtaining the aerodynamic torque according to the product of the blade root bending moment and the correction coefficient.
6. The method for evaluating the state of a wind turbine according to claim 5, wherein the correction factor is obtained by:
measuring a first pneumatic torque of a wind generating set prototype through a torque sensor and obtaining a blade root bending moment average value of three blades of the wind generating set prototype;
and performing curve fitting or linear regression analysis on the first aerodynamic torque and the blade root bending moment average value to obtain the correction coefficient.
7. The method of state assessment of a wind power plant according to any of claims 1 to 4, wherein the plant efficiency is determined by the product of the wind power plant's generator mechanical efficiency, generator electrical efficiency, electrical drive train efficiency and mechanical drive train efficiency.
8. The method for evaluating the state of a wind turbine according to claim 7, further comprising: obtaining a tip speed ratio, blade simulation parameters and pitch angles of the wind generating set; and determining the blade absorption efficiency according to the blade tip speed ratio, the blade simulation parameters, the pitch angle and a predetermined blade absorption efficiency model.
9. The method for evaluating the state of a wind power generator set according to claim 1, wherein the step of evaluating the state of the wind power generator set based on the first power and the actual output power or grid-connected power of the wind power generator set comprises:
and determining that the wind generating set is in an abnormal state in response to the absolute value of the difference between the first power and the actual output power or the grid-connected power being greater than or equal to a first preset threshold value and lasting for a first preset time, or the absolute value being greater than or equal to a second preset threshold value, being smaller than the first preset threshold value and lasting for a second preset time, wherein the first preset threshold value is greater than the second preset threshold value, and the first preset time is smaller than the second preset time.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores instructions or a program, which when executed by a processor, implements a method of state assessment of a wind park according to any one of claims 1 to 9.
11. A state evaluation device of a wind turbine generator system, comprising:
the blade root bending moment acquisition unit is used for acquiring the blade root bending moment of the wind generating set;
the first calculation unit is used for obtaining aerodynamic torque according to the blade root bending moment;
the second calculation unit is used for obtaining impeller absorption power based on the product of the aerodynamic torque, the impeller rotating speed of the wind generating set and the blade absorption efficiency;
a third calculation unit for obtaining a first power according to the product of the impeller absorption power and the unit efficiency;
and the evaluation unit evaluates the state of the wind generating set according to the first power and the actual output power or grid-connected power of the wind generating set.
12. A controller of a wind turbine generator set, characterized by comprising a processor and a computer readable storage medium storing a program or instructions which, when executed by the processor, implement a method of state assessment of a wind turbine generator set according to any one of claims 1 to 9.
13. A wind power plant comprising a state evaluation device according to claim 11 or a controller according to claim 12.
CN202310582225.1A 2023-05-22 2023-05-22 State evaluation method of wind generating set, controller and wind generating set Pending CN116538027A (en)

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CN202310582225.1A CN116538027A (en) 2023-05-22 2023-05-22 State evaluation method of wind generating set, controller and wind generating set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310582225.1A CN116538027A (en) 2023-05-22 2023-05-22 State evaluation method of wind generating set, controller and wind generating set

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CN116538027A true CN116538027A (en) 2023-08-04

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