CN113468712B - Method and equipment for determining service life of stressed component of wind turbine generator structure - Google Patents
Method and equipment for determining service life of stressed component of wind turbine generator structure Download PDFInfo
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- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
A method and apparatus for determining the useful life of a stressed component of a wind turbine structure is provided, the method comprising: constructing a safety check index function aiming at a stress part of a wind turbine generator system structure; the service life of the stressed component of the wind turbine generator structure is determined based on the constructed safety check index function, wherein the safety check index function is constructed based on the whole design life of the wind turbine generator under standard design wind parameters, the fatigue material coefficient of the stressed component of the wind turbine generator structure and the service life of the stressed component of the wind turbine generator structure and is used for representing the corresponding relation between the service life of the stressed component of the wind turbine generator structure and the safety check index. By adopting the method and the equipment, the service life of each part of the wind turbine generator set at the specific site can be accurately and rapidly estimated, and an advantageous foundation is laid for selecting a proper service life customizing scheme and operation and maintenance strategy for the whole wind turbine generator set subsequently, so that the benefit maximization of the wind power plant is ensured.
Description
Technical Field
The present invention relates generally to the field of wind power generation, and more particularly to a method and apparatus for determining the useful life of a stressed component of a wind turbine structure.
Background
With the increase of the running time of the wind turbine, the wind power generation equipment inevitably generates aging failure, and potential safety hazard and even economic loss are brought to wind power generation enterprises. The service life of the stressed component of the wind turbine generator structure can be accurately predicted, so that potential safety hazards can be reduced, and economic losses can be reduced.
At present, a common method is to give a wind parameter and an estimated service life, judge the adaptability of the load of the whole machine under the estimated service life, and thus estimate the service life of the whole machine of the wind turbine, but the method can only estimate the service life of the whole machine of the wind turbine, but can not reflect the estimated service life of each structural stress part of the wind turbine, and other existing service life prediction methods are limited to specific equivalent loads or specific structural stress parts of the wind turbine, and are also effective for predicting the service life of part of structural stress parts of the wind turbine. The method is difficult to predict the service lives of all the stressed components of the wind turbine generator system.
Disclosure of Invention
The invention provides a method and equipment for determining service life of a stressed component of a wind turbine generator structure, which can overcome the defect that the existing method for predicting the service life of the stressed component of the wind turbine generator structure cannot be applied to most stressed components of the wind turbine generator structure.
According to an aspect of an exemplary embodiment of the present invention, there is provided a method for determining a service life of a stressed component of a wind turbine structure, the method comprising: constructing a safety check index function aiming at a stress part of a wind turbine generator system structure; the service life of the stressed component of the wind turbine generator structure is determined based on the constructed safety check index function, wherein the safety check index function is constructed based on the whole design life of the wind turbine generator under standard design wind parameters, the fatigue material coefficient of the stressed component of the wind turbine generator structure and the service life of the stressed component of the wind turbine generator structure and is used for representing the corresponding relation between the service life of the stressed component of the wind turbine generator structure and the safety check index.
Optionally, the wind turbine structure stress component includes a constrained component and an unconstrained component, wherein the constrained component and the unconstrained component are determined by: and determining the parts which need to acquire the manufacturer side safety check index function corresponding to the estimated service life from the manufacturer of the stress part of the wind turbine generator structure as limited parts, and determining the parts which do not need to acquire the manufacturer side safety check index function corresponding to the estimated service life from the manufacturer of the stress part of the wind turbine generator structure as non-limited parts.
Optionally, the wind turbine generator system structural stress component includes a limited component, and the safety check index function includes a limited safety check index function corresponding to each estimated service life of the plurality of estimated service lives, where the service life of the limited component is determined by: and arranging the estimated service lives in a sequence from large to small, circularly and sequentially obtaining the safety check index of the limited part under the estimated service life based on the limited safety check index function according to the arrangement sequence of the estimated service lives, comparing the obtained safety check index of the limited part under the estimated service life with a first safety index threshold value, stopping circulation until the obtained safety check index is smaller than the first safety index threshold value, and determining the estimated service life corresponding to the obtained safety check index as the minimum value of the service life of the limited part.
Optionally, the step of obtaining the safety check index of the limited component under the estimated service life based on the limited safety check index function includes: determining a reference load of the limited part based on the whole design life of the wind turbine under standard design wind parameters, the fatigue material coefficient of the stressed part of the wind turbine structure and the estimated service life of the limited part; substituting the estimated service life of the limited part and the determined reference load into the limited safety check index function to obtain the safety check index of the limited part under the estimated service life.
Optionally, the wind turbine structure stress component includes a limited component, and the safety check index function is constructed based on the overall design life of the wind turbine under standard design wind parameters, the fatigue material coefficient of the wind turbine structure stress component, and the service life of the wind turbine structure stress component in the following manner: acquiring manufacturer-side safety check index functions of the limited part under the estimated service lives from manufacturers of the limited part; and constructing a safety check index function of the limited part under any estimated service life based on the manufacturer side safety check index function of the limited part under any estimated service life, the overall design life of the wind turbine under the standard design wind parameters, the fatigue material coefficient of the limited part and the service life of the limited part.
Optionally, the constructing the safety check index function of the limited component under any estimated service life based on the manufacturer side safety check index function of the limited component under any estimated service life, the overall design life of the wind turbine under standard design wind parameters, the fatigue material coefficient of the limited component, and the service life of the limited component specifically includes: acquiring a manufacturer side safety check index function of the limited part under any estimated service life and a fatigue material coefficient of the limited part; determining a reference load of the limited part when the estimated service life of the limited part is equal to the whole machine design life of the wind turbine under standard design wind parameters based on a manufacturer side safety check index function of the limited part under any estimated service life and a material coefficient of fatigue of the limited part; performing function conversion processing on the reference load of the limited part under any estimated service life based on the reference load of the limited part when the estimated service life is equal to the overall design life of the wind turbine generator under the standard design wind parameters, and obtaining a new reference load of the limited part under any estimated service life; substituting the new reference load into a manufacturer side safety check index function of the limited part under any estimated service life to obtain a safety check index function of the limited part under any estimated service life.
Optionally, the wind turbine generator system structural stress component includes an unrestricted component, and the safety check index function includes an unrestricted safety check index function, where a service life of the unrestricted component is determined by: and under the constraint condition that the unrestricted safety check index function meets a second safety index threshold, determining the maximum value of the service life of the unrestricted component based on the unrestricted safety check index function, and determining the determined maximum value as the service life of the unrestricted component.
Optionally, the wind turbine structure stress component includes an unrestricted component, and the safety check index function is constructed based on the overall design life of the wind turbine under standard design wind parameters, the fatigue material coefficient of the wind turbine structure stress component, and the service life of the wind turbine structure stress component by: acquiring a manufacturer-side safety check index function of the unrestricted component from a manufacturer of the unrestricted component; and constructing the safety check index function of the unrestricted component based on the manufacturer side safety check index function of the unrestricted component, the overall design life of the wind turbine generator under the standard design wind parameters, the fatigue material coefficient of the unrestricted component and the service life of the unrestricted component.
Optionally, the safety check index function of the unrestricted component is constructed based on the manufacturer side safety check index function of the unrestricted component, the overall design life of the wind turbine under standard design wind parameters, the fatigue material coefficient of the unrestricted component and the service life of the unrestricted component, and specifically comprises: determining a reference load of the unrestricted component when the service life of the unrestricted component is equal to the service life of the whole wind turbine under standard design wind parameters based on a manufacturer side safety check index function of the unrestricted component and a fatigue material coefficient of the unrestricted component; performing function conversion processing on the reference load of the unrestricted component under the service life of the unrestricted component based on the reference load of the unrestricted component when the service life of the unrestricted component is equal to the service life of the whole machine of the wind turbine generator under the standard design wind parameters, and obtaining a new reference load of the unrestricted component under the service life of the unrestricted component; substituting the new reference load into the manufacturer side safety check index function of the unrestricted component to obtain the safety check index function of the unrestricted component.
Optionally, the reference load comprises at least one of: load persistence distribution, equivalent fatigue load, and markov matrix load.
According to another aspect of an exemplary embodiment of the present invention, there is provided an apparatus for determining a service life of a stressed component of a wind turbine structure, the apparatus comprising: the construction unit is used for constructing a safety check index function aiming at a stress part of the wind turbine generator structure; the service life determining unit is used for determining the service life of the stressed component of the wind turbine generator structure based on the constructed safety check index function, wherein the safety check index function is constructed based on the whole design life of the wind turbine generator under standard design wind parameters, the fatigue material coefficient of the stressed component of the wind turbine generator structure and the service life of the stressed component of the wind turbine generator structure and is used for representing the corresponding relation between the service life of the stressed component of the wind turbine generator structure and the safety check index.
Optionally, the wind turbine structure stress component includes a constrained component and an unconstrained component, wherein the apparatus further includes: and the component determining unit is used for determining a component which is required to acquire a manufacturer side safety check index function corresponding to the estimated service life from a manufacturer of the forced component of the wind turbine generator system structure as a limited component and determining a component which is not required to acquire the manufacturer side safety check index function corresponding to the estimated service life from the manufacturer of the forced component of the wind turbine generator system structure as an unlimited component.
Optionally, the wind turbine generator system structural stress component includes a limited component, the safety check index function includes a limited safety check index function corresponding to each estimated service life of the plurality of estimated service lives, and the service life determining unit determines the service life of the limited component by: and arranging the estimated service lives in a sequence from large to small, circularly and sequentially obtaining the safety check index of the limited part under the estimated service life based on the limited safety check index function according to the arrangement sequence of the estimated service lives, comparing the obtained safety check index of the limited part under the estimated service life with a first safety index threshold value, stopping circulation until the obtained safety check index is smaller than the first safety index threshold value, and determining the estimated service life corresponding to the obtained safety check index as the minimum value of the service life of the limited part.
Optionally, the service life determining unit determines the reference load of the limited part based on the whole design life of the wind turbine generator under the standard design wind parameter, the fatigue material coefficient of the stressed part of the wind turbine generator structure and the estimated service life of the limited part, and substitutes the estimated service life of the limited part and the determined reference load into the limited safety check index function to obtain the safety check index of the limited part under the estimated service life.
Optionally, the construction unit is configured to: acquiring manufacturer side safety check index functions of the limited part under the estimated service lives; and constructing a safety check index function of the limited part under any estimated service life based on the manufacturer side safety check index function of the limited part under any estimated service life, the overall design life of the wind turbine under the standard design wind parameters, the fatigue material coefficient of the limited part and the service life of the limited part.
Optionally, the construction unit constructs the safety check index function of the limited component under any estimated service life based on the manufacturer side safety check index function of the limited component under any estimated service life, the overall design life of the wind turbine under standard design wind parameters, the fatigue material coefficient of the limited component and the service life of the limited component in the following manner: acquiring a manufacturer side safety check index function of the limited part under any estimated service life and a fatigue material coefficient of the limited part; determining a reference load of the limited part when the estimated service life of the limited part is equal to the whole machine design life of the wind turbine generator set under standard design wind parameters based on a manufacturer side safety check index function of the limited part under any estimated service life and a fatigue material coefficient of the limited part; performing function conversion processing on the reference load of the limited part under any estimated service life based on the reference load of the limited part when the estimated service life is equal to the overall design life of the wind turbine generator under the standard design wind parameters, and obtaining a new reference load of the limited part under any estimated service life; substituting the new reference load into a manufacturer side safety check index function of the limited part under any estimated service life to obtain a safety check index function of the limited part under any estimated service life.
Optionally, the wind turbine component includes an unrestricted component, the safety check index function includes an unrestricted safety check index function, and the service life determining unit determines the service life of the unrestricted component by: and under the constraint condition that the unrestricted safety check index function meets a second safety index threshold, determining the maximum value of the service life of the unrestricted component based on the unrestricted safety check index function, and determining the determined maximum value as the service life of the unrestricted component.
Optionally, the construction unit constructs the unrestricted safety check index function based on the overall design life of the wind turbine under the standard design wind parameters, the fatigue material coefficient of the stressed component of the wind turbine structure, and the service life of the stressed component of the wind turbine structure by: acquiring a manufacturer-side safety check index function of the unrestricted component from a manufacturer of the unrestricted component; and constructing the safety check index function of the unrestricted component based on the manufacturer side safety check index function of the unrestricted component, the overall design life of the wind turbine generator under the standard design wind parameters, the fatigue material coefficient of the unrestricted component and the service life of the unrestricted component.
Optionally, the building unit builds the safety check index function of the unrestricted component based on the manufacturer-side safety check index function of the unrestricted component, the overall design life of the wind turbine generator under standard design wind parameters, the fatigue material coefficient of the unrestricted component, and the service life of the unrestricted component in the following manner, and specifically includes: determining a reference load of the unrestricted component when the service life of the unrestricted component is equal to the service life of the whole wind turbine under standard design wind parameters based on a manufacturer side safety check index function of the unrestricted component and a fatigue material coefficient of the unrestricted component; performing function conversion processing on the reference load of the unrestricted component under the service life of the unrestricted component based on the reference load of the unrestricted component when the service life of the unrestricted component is equal to the service life of the whole machine of the wind turbine generator under the standard design wind parameters, and obtaining a new reference load of the unrestricted component under the service life of the unrestricted component; substituting the new reference load into the manufacturer side safety check index function of the unrestricted component to obtain the safety check index function of the unrestricted component.
Optionally, the reference load comprises at least one of: load persistence distribution, equivalent fatigue load, and markov matrix load.
In another aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes: a processor, a memory, and a computer program stored on the memory and executable on the processor; and the processor executes the computer program to determine the service life of the stressed component of the wind turbine generator structure.
In another aspect, an embodiment of the present invention further provides a computer readable storage medium, where a computer program is stored, where the computer program when executed by a processor implements the method for determining a service life of a stressed component of a wind turbine generator structure.
By utilizing the method and the device for determining the service life of the stress component of the wind turbine generator structure, which are provided by the embodiment of the invention, the service life of each stress component of the wind turbine generator structure at a specific site can be accurately and quickly estimated, a favorable foundation is laid for selecting a proper service life customization scheme (for example, running according to the most proper service life of the whole wind turbine generator) and an operation and maintenance strategy (for example, monitoring and replacing the stress components of different wind turbine generator structures before reaching the determined service life) for the whole wind turbine generator, and the maximization of the benefit of a wind power plant is ensured.
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 of exemplary embodiments of the invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings which illustrate exemplary embodiments in which:
FIG. 1 illustrates a flowchart of a method of determining the service life of a structural stressed member of a wind turbine generator according to an exemplary embodiment of the invention;
FIG. 2 illustrates a block diagram of an apparatus for determining the useful life of a stressed component of a wind turbine structure in accordance with an exemplary embodiment of the invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments will be described below in order to explain the present invention by referring to the figures.
FIG. 1 illustrates a flowchart of a method of determining the useful life of a stressed component of a wind turbine structure, wherein a wind turbine may be located at a particular site, according to an exemplary embodiment of the invention.
As shown in fig. 1, in step S100, a safety check index function is constructed for the stress component of the wind turbine generator structure, where the safety check index function is constructed based on the overall design life of the wind turbine generator under the standard design wind parameters, the fatigue material coefficient of the stress component of the wind turbine generator structure, and the service life of the stress component of the wind turbine generator structure, and is used to characterize the correspondence between the service life of the stress component of the wind turbine generator structure and the safety check index. Here, the safety check index function refers to a function for evaluating safety performance of the stress component of the wind turbine generator system by using the service life of the stress component of the wind turbine generator system.
In an exemplary embodiment of the present invention, the stress component of the wind turbine generator structure refers to a wind turbine generator component that may be damaged and destroyed by fatigue due to various mechanical forces during the life cycle of the wind farm, for example: fan large parts such as blades, hubs, nacelle, motor, tower, foundation, etc.; the transmission components comprise main bearings, yaw bearings, pitch reducers, yaw toothed belts and the like; the connecting elements such as connecting bolts, anchor bolts, foundation rings and flanges in and between the large part transmission parts comprise a tower and each connecting flange of the foundation, a tower welding line, a door opening and the like.
In addition, according to whether the manufacturer-side safety check index function corresponding to the estimated service life exists, stress components of the wind turbine structure can be divided into two types, namely limited components and non-limited components, wherein the limited components and the non-limited components can be determined specifically by the following modes: and determining the parts which need to acquire the manufacturer-side safety check index function corresponding to the estimated service life from the manufacturer of the forced part of the wind turbine generator structure as limited parts, and determining the parts which do not need to acquire the manufacturer-side safety check index function corresponding to the estimated service life from the manufacturer of the forced part of the wind turbine generator structure as non-limited parts.
Here, the estimated service life may be a minimum value of service life of a stress component (e.g., a limited component) of the wind turbine generator system structure, which is pre-established by a worker of the wind farm of the specific site, that is, at least how many years the limited component may be used, for example, a set of estimated service lives may be defined by the worker as 15 years, 20 years, 25 years, and 30 years, and may be defined by the worker as 15 years, 18 years, 23 years, 25 years, and 30 years. It should be understood that the estimated service life may be any granularity of years set by a worker of a wind farm at a specific site, and the present invention is not limited in this regard.
Specifically, the manufacturer-side safety check index function corresponding to the estimated service life can be obtained from the manufacturer of the stress component of the wind turbine generator system structure in the following manner: under the condition of experience conversion (linear conversion) of the wind turbine generator in the corresponding relation between the standard design wind parameters and the load size, estimating the envelope load (corresponding to the reference load below) of the structural component of the wind turbine generator in the estimated service life, sending the estimated envelope load and the estimated service life to manufacturers of stress components of the wind turbine generator, determining a manufacturer-side safety check index function under the estimated envelope load and the estimated service life by the manufacturers of stress components of the wind turbine generator, and returning the safety check index function to a wind power plant. In the invention, a part which needs to acquire a manufacturer-side safety check index function corresponding to the estimated service life from a manufacturer of the stressed part of the wind turbine generator system structure is determined to be a limited part. And determining the part which does not need to acquire the manufacturer-side safety check index function corresponding to the estimated service life from the manufacturer of the stressed part of the wind turbine generator system structure as an unrestricted part.
In the following, a specific example will be used to describe how to construct a safety check index function of a stress component of a wind turbine generator structure.
In one example of the invention, the wind turbine structural stress component comprises a constrained component, and the constrained safety check index function can be constructed based on the overall design life of the wind turbine under standard design wind parameters, the fatigue material coefficient of the wind turbine structural stress component, and the service life of the wind turbine structural stress component by:
firstly, acquiring manufacturer-side safety check index functions of the limited part under a plurality of estimated service lives from manufacturers of the limited part. As an example, vendor-side safety check index functions of a limited component over a plurality of estimated useful lives may be obtained by: under the condition that a plurality of estimated service lives of a limited part are established in advance by staff of a wind power plant, determining a reference load of the limited part under each estimated service life in the plurality of estimated service lives, sending different estimated service lives and the reference load under the different estimated service lives to manufacturers of the limited part, establishing manufacturer side safety check index functions under the different estimated service lives by the manufacturers of the limited part based on the different estimated service lives and the reference load under the different service lives, and acquiring the established manufacturer side safety check index functions under the different estimated service lives from the manufacturers. In an example of the invention, the reference load may include, but is not limited to, at least one of: load persistence distribution, equivalent fatigue load, and markov matrix load. Here, the load sustained distribution may include, but is not limited to, any one of a time history load and a lap history load to which the limited part is subjected,
Here, the markov matrix load (Markov Matrix Load), which is a statistical matrix of load data of a rain flow count method, represents the number of cycles at a certain load mean value and a certain load amplitude within an evaluation period.
In addition, the Rain flow counting Method mainly simplifies the time load process into a plurality of load cycles for fatigue life estimation and fatigue test load spectrum programming. Based on the double parameter method, two variables of dynamic intensity (amplitude) and static intensity (mean) are considered.
And then, constructing a safety check index function of the limited part under any estimated service life based on the manufacturer side safety check index function of the limited part under any estimated service life, the whole design life of the wind turbine under the standard design wind parameters, the fatigue material coefficient of the limited part and the service life of the limited part.
As an example, the safety check index function for a limited component at any estimated service life may be constructed by:
firstly, acquiring a manufacturer side safety check index function of the limited part under any estimated service life and a fatigue material coefficient of the limited part.
And then, determining the reference load of the limited part when any estimated service life is equal to the whole machine design life of the wind turbine generator set under the standard design wind parameters based on the manufacturer side safety check index function of the limited part under any estimated service life and the fatigue material coefficient of the limited part.
And then, performing function conversion processing on the reference load of the limited part under any estimated service life based on the reference load of the limited part when any estimated service life is equal to the whole machine design life of the wind turbine generator under the standard design wind parameters, and obtaining a new reference load of the limited part under any estimated service life.
For example, the fatigue material coefficient of the limited part obtained from the manufacturer of the limited part is m, and the manufacturer-side safety check index function obtained from the manufacturer of the limited part at the estimated life y is S (T (y, m), y), where T (y, m) is the reference load of the limited part when the estimated life is y and the fatigue material coefficient of the limited part is m.
In the following, taking the reference load T (y, m) as an equivalent fatigue load as an example, how to perform function conversion processing on the reference load of the limited component under any estimated service life based on the reference load of the limited component under any estimated service life when the estimated service life is equal to the whole machine design life of the wind turbine generator set under the standard design wind parameters will be described.
Specifically, by assuming a fatigue rain accumulation formula in infinite circulation, the equivalent fatigue load formula of the wind turbine can be obtained as followsWhere m represents the Wohler (stress-life) index of the fatigue load stress-cycle number curve (i.e., the fatigue material coefficient of the constrained component), f i Represents the range of the ith cyclic load, p i The frequency of occurrence duty ratio of the range value representing the ith cyclic load is 1.ltoreq.i.
At the position ofn i Representing the number of cycles in one year for the range of ith cyclic load, N represents the reference load for the restricted part at any estimated useful life y for the case of infinite loop number for fatigue load stress versus cycle number curveThe service life y of the limited part in any estimated period is equal to the design life y of the whole wind turbine generator set under the standard design wind parameters 0 Reference load at time
Dividing the two sides of the equation of the formula (1) by the two sides of the equation of the formula (2) respectively to obtain a new load reference when the reference load T (y, m) obtained after the function conversion processing is the equivalent fatigue load:
in a similar way, a new reference load can also be obtained when the reference load T (y, m) is any one of a markov matrix, a time history load and a lap history load.
And finally, substituting the new reference load into the manufacturer side safety check index function of the limited part under any estimated service life after obtaining the new reference load, and obtaining the safety check index function of the limited part under any estimated service life.
For example, following the above example, substituting equation (3) for S (T (y, m), y) as the manufacturer-side safety check index function of the limited part at any estimated service life y, the safety check index function S of the limited part at any estimated service life y (T ((y) 0 ,y,m),y)。
By the method, the service life of the whole machine of the wind turbine under the standard design wind parameters can be introduced into the manufacturer side safety check index function of the limited part under any estimated service life, so that the safety check index function of the limited part under any estimated service life, about the service life of the whole machine of the wind turbine under the standard design wind parameters, any estimated service life and fatigue material coefficients can be obtained.
In another example of the invention, the wind turbine structural force-receiving component comprises an unconstrained component, and the constrained safety check index function can be constructed based on the overall design life of the wind turbine under standard design wind parameters, the fatigue material coefficient of the wind turbine structural force-receiving component, and the service life of the wind turbine structural force-receiving component by:
First, a vendor-side security check index function of an unrestricted component is obtained from a manufacturer of the unrestricted component. Here, the vendor-side security check index function of the unrestricted component may be obtained from the manufacturer of the unrestricted component.
And then, constructing a safety check index function of the unrestricted component based on the manufacturer side safety check index function of the unrestricted component, the whole machine design service life of the wind turbine generator under the standard design wind parameters, the fatigue material coefficient of the unrestricted component and the service life of the unrestricted component.
As an example, the method for constructing the safety check index function of the non-limited part based on the manufacturer side safety check index function of the non-limited part, the whole machine design life of the wind turbine under the standard design wind parameters, the fatigue material coefficient of the non-limited part and the service life of the non-limited part specifically comprises the following steps:
firstly, determining a reference load of an unrestricted component when the service life of the unrestricted component is equal to the service life of the whole machine of the wind turbine generator under standard design wind parameters based on a manufacturer side safety check index function of the unrestricted component and a fatigue material coefficient of the unrestricted component.
And then, performing function conversion processing on the reference load of the unrestricted component under the service life of the unrestricted component based on the reference load of the unrestricted component when the service life of the unrestricted component is equal to the service life of the whole machine of the wind turbine generator under the standard design wind parameters, and obtaining a new reference load of the unrestricted component under the service life of the unrestricted component. Because the function conversion processing of the reference load of the unrestricted component under the service life of the unrestricted component is the same as the method of the function conversion processing described above for the restricted component based on the reference load of the unrestricted component under the service life of the complete machine with the service life equal to the standard design wind parameters of the wind turbine generator, the description thereof will not be repeated here.
And finally, substituting the new reference load into the manufacturer side safety check index function of the unrestricted component to obtain the safety check index function of the unrestricted component. For example, the service life of the unrestricted component is y 1 The fatigue material coefficient of the obtained unrestricted component is m 1 The vendor-side security check index function of an unrestricted component obtained from the manufacturer of the unrestricted component can be expressed as S 1 (T(y 1 ,m 1 ),y 1 ) Wherein T (y 1 ,m 1 ) For the service life of y 1 Fatigue material coefficient of unconstrained parts is m 1 Not at allReference load of the limiting member. The design life of the whole machine of the wind turbine generator under the standard design wind parameters is y 0 In this case, the obtained safety check index function of the unrestricted component may be expressed as S 1 (T((y 0 ,y 1 ,m),y 1 )。
With continued reference to FIG. 1, at step S200, a service life of a stressed component of a wind turbine structure is determined based on the constructed safety check index function.
In one example, when the wind turbine structural stress component includes a constrained component, the safety check index function constructed as described above may include a constrained safety check index function corresponding to each of a plurality of estimated useful lives.
Specifically, the service life of the restricted component may be determined by:
Firstly, a plurality of estimated service lives are arranged in order from large to small.
And then, according to the arrangement sequence of the estimated service lives, the safety check index of the limited part under the estimated service life is obtained based on the limited safety check index function in turn in a circulating manner, the obtained safety check index of the limited part under the estimated service life is compared with a first safety index threshold value, and the circulation is stopped until the obtained safety check index is smaller than the first safety index threshold value. Here, the first safety index threshold may be a predetermined constant. For example, the first safety index threshold may be a constant that is empirically preset, but is not limited thereto.
And finally, determining the estimated service life corresponding to the obtained safety check index as the minimum value of the service life of the limited part.
Here, regarding the step of obtaining the safety check index of the limited part under the estimated service life based on the limited safety check index function, in one example, the reference load of the limited part may be determined based on the overall design life of the wind turbine generator under the standard design wind parameters, the fatigue material coefficient of the limited part, and the estimated service life of the limited part and the determined reference load may be substituted into the limited safety check index function to obtain the safety check index of the limited part under the estimated service life.
How to determine the service life of the restricted component will be described in detail below in connection with examples: assuming that a set of estimated service lives set by staff of a wind power plant are 15 years, 20 years, 25 years and 30 years respectively, the overall design life of the wind turbine generator set under standard design wind parameters is 20 years, the fatigue material coefficient m of the limited part is a corresponding value 4 of steel, the first safety index threshold is 75, and each estimated service life corresponds to different safety check index functions respectively.
Specifically, the estimated service lives of the groups are firstly arranged in the order from big to small, and the arrangement results are 30 years, 25 years, 20 years and 15 years. Then, y=30, y is set in order of arrangement result 0 Substituting the values of =20 and m=4 into the safety check index function with the estimated service life of 30 years to obtain the safety check index s with the estimated service life of 30 years 30 Then s is taken 30 Comparing with the first safety index threshold 75 if s 30 Less than the first safety index threshold 75, y=30 is taken as the minimum value of the safety check index of the limited component at an estimated service life of 30 years, in other words, the limited component can be used for at least 30 years. If s is 30 Not less than the first safety index threshold 75, the estimated service life y=25, y after 30 years of estimated service life is arranged 0 Substituting the values of =20 and m=4 into the safety check index function under the estimated service life of 25 years to obtain the safety check index s under the estimated service life of 25 years 25 Then s is taken 25 Comparing with the first safety index threshold 75 if s 25 Less than the first safety index threshold 75, y=25 is taken as the minimum value of the safety check index of the limited component under the estimated service life of 25 years, in other words, the limited component can be used for at least 25 years. If s is 25 If the safety check index is not smaller than the first safety index threshold 75, the method is circulated until the obtained safety check index is smaller than the first safety index threshold. By the method, the service life of the limited part can be estimated rapidly and accurately.
In another example, the wind turbine structural force component includes an unrestricted component, and the safety check index function constructed as described above may include an unrestricted safety check index function, wherein the service life of the unrestricted component is determined by: and under the constraint condition that the unrestricted safety check index function meets the second safety index threshold, determining the maximum value of the service life of the unrestricted component based on the unrestricted safety check index function, and determining the determined maximum value as the service life of the unrestricted component. Here, the second security index threshold is a predetermined constant. For example, the second safety index threshold value may be a constant that is empirically preset, but is not limited thereto.
For example, assume that the safety check index function of an unrestricted component is S (T ((y) 0 ,y 1 ,m),y 1 ) The second safety index threshold is 100, the constraint condition of the second safety index is less than 100, y 0 =20 and m 1 =4 substitution into S (T ((y) 0 ,y 1 ,m 1 ),y 1 ) Less than or equal to 100 due to y 0 And m 1 Are known quantities, so that y can be obtained by solving the inequality 1 Will y 1 Is determined as the service life of the unrestricted component.
According to the method for determining the service life of the stressed component of the wind turbine generator structure, disclosed by the embodiment of the invention, the accurate and rapid assessment of the service life of each component of the wind turbine generator at a specific site can be realized, and a favorable foundation is laid for the subsequent selection of a proper service life customization scheme (for example, the operation according to the most proper operating income of the whole wind turbine generator) and an operation and maintenance strategy (for example, the monitoring and replacement are carried out before the stressed components of different wind turbine generator structures reach the determined service life) for the whole wind turbine generator, so that the maximization of the benefit of a wind power plant is ensured.
Based on the same inventive concept as the method for determining the service life of the stressed component of the wind turbine generator structure shown in fig. 1, the embodiment of the invention further provides equipment for determining the service life of the stressed component of the wind turbine generator structure, as in the following embodiment. Because the principle of the device for solving the problem is similar to that of the method shown in fig. 1, the implementation of the device can refer to the implementation of the method for determining the service life of the stressed component of the wind turbine generator structure shown in fig. 1, and the repetition is omitted.
FIG. 2 illustrates a block diagram of an apparatus for determining the useful life of a stressed component of a wind turbine structure, wherein the wind turbine may be located at a particular site, according to an exemplary embodiment of the invention.
As shown in fig. 2, an apparatus for determining a service life of a stress member of a wind turbine structure according to an exemplary embodiment of the present invention includes: a construction unit 100 and a service life determination unit 200.
The construction unit 100 constructs a safety check index function for the stress component of the wind turbine generator structure, wherein the safety check index function is constructed based on the whole design life of the wind turbine generator under the standard design wind parameters, the fatigue material coefficient of the stress component of the wind turbine generator structure and the service life of the stress component of the wind turbine generator structure, and is used for representing the corresponding relation between the service life of the stress component of the wind turbine generator structure and the safety check index.
In an exemplary embodiment of the invention, the wind turbine structural force-receiving component may include a constrained component and an unconstrained component. Specifically, the apparatus may further include a component determination unit (not shown in fig. 2), wherein the component determination unit determines, as the restricted component, a component for which a manufacturer-side safety check index function corresponding to the estimated service life is required to be acquired from a manufacturer of the wind turbine structure force receiving component, and determines, as the unrestricted component, a component for which a manufacturer-side safety check index function corresponding to the estimated service life is not required to be acquired from a manufacturer of the wind turbine structure force receiving component.
In one example of the invention, the wind turbine structural stress component comprises a constrained component, and the building unit 100 is specifically configured to: acquiring manufacturer side safety check index functions of the limited part under a plurality of estimated service lives from manufacturers of the limited part; the safety check index function of the limited part under any estimated service life is constructed based on the manufacturer side safety check index function of the limited part under any estimated service life, the overall design life of the wind turbine under the standard design wind parameters, the fatigue material coefficient of the limited part and the service life of the limited part.
As an example, the building unit 100 may specifically be configured to:
and acquiring a manufacturer side safety check index function of the limited part under any estimated service life and a fatigue material coefficient of the limited part.
Determining a reference load of the limited part when any estimated service life is equal to the whole machine design life of the wind turbine generator set under standard design wind parameters based on a manufacturer side safety check index function of the limited part under any estimated service life and fatigue material coefficients of the limited part;
performing function conversion processing on the reference load of the limited part under any estimated service life based on the reference load of the limited part when any estimated service life is equal to the whole machine design life of the wind turbine generator under the standard design wind parameters, and obtaining a new reference load of the limited part under any estimated service life;
Substituting the new reference load into the manufacturer side safety check index function of the limited part under any estimated service life to obtain the safety check index function of the limited part under any estimated service life.
By the method, the service life of the whole machine of the wind turbine under the standard design wind parameters can be introduced into the manufacturer side safety check index function of the limited part under any estimated service life, so that the safety check index function of the limited part under any estimated service life, about the service life of the whole machine of the wind turbine under the standard design wind parameters, any estimated service life and fatigue material coefficients can be obtained.
In another example of the invention, when the wind turbine structural stress component comprises an unrestricted component, the building unit 100 may be configured to: acquiring a manufacturer-side safety check index function of the unrestricted component from a manufacturer of the unrestricted component; the safety check index function of the unrestricted component is constructed based on the manufacturer side safety check index function of the unrestricted component, the whole machine design service life of the wind turbine generator under the standard design wind parameters, the fatigue material coefficient of the unrestricted component and the service life of the unrestricted component.
As an example, the building unit 100 may be used to:
determining a reference load of the unrestricted component when the service life of the unrestricted component is equal to the service life of the whole machine of the wind turbine under the standard design wind parameters based on the manufacturer side safety check index function of the unrestricted component and the fatigue material coefficient of the unrestricted component;
performing function conversion processing on the reference load of the unrestricted component under the service life of the unrestricted component based on the reference load when the service life of the unrestricted component is equal to the service life of the whole machine of the wind turbine generator under the standard design wind parameters, and obtaining a new reference load of the unrestricted component under the service life of the unrestricted component;
substituting the new reference load into the manufacturer side safety check index function of the unrestricted component to obtain the safety check index function of the unrestricted component.
The service life determining unit 200 determines the service life of the stressed component of the wind turbine generator structure based on the constructed safety check index function.
In one example, the wind turbine structural stress component includes a constrained component, and the safety check index function constructed as described above may include a constrained safety check index function corresponding to each of a plurality of estimated useful lives.
Specifically, the service life determining unit 200 may determine the service life of the limited part by:
firstly, a plurality of estimated service lives are arranged in order from large to small.
Then, according to the arrangement sequence of a plurality of estimated service lives, the safety check index of the limited part under the estimated service life is obtained based on the limited safety check index function in turn in a circulating manner, the obtained safety check index of the limited part under the estimated service life is compared with a first safety index threshold value, the circulation is stopped until the obtained safety check index is smaller than the first safety index threshold value,
and finally, determining the estimated service life corresponding to the obtained safety check index as the minimum value of the service life of the limited part.
As an example, the service life determining unit 200 determines the reference load of the limited component based on the overall design life of the wind turbine generator under the standard design wind parameters, the fatigue material coefficient of the limited component, and the estimated service life of the limited component, and substitutes the estimated service life of the limited component and the determined reference load into the limited safety check index function to obtain the safety check index of the limited component under the estimated service life. As an example, the reference load may include, but is not limited to, at least one of: load persistence distribution, equivalent fatigue load, and markov matrix load. Here, the load sustained distribution may again include, but is not limited to, any one of a time history load and a lap history load to which the limited part is subjected.
In another example, when the wind turbine structure force-receiving component includes an unrestricted component, the safety check index function constructed as described above may include an unrestricted safety check index function, wherein the service life determining unit 200 determines the service life of the unrestricted component by: and under the constraint condition that the unrestricted safety check index function meets the second safety index threshold, determining the maximum value of the service life of the unrestricted component based on the unrestricted safety check index function, and determining the determined maximum value as the service life of the unrestricted component. Here, the second security index threshold is a predetermined constant.
It should be appreciated that the specific implementation manner of the apparatus for determining the service life of the stressed component of the wind turbine generator system according to the exemplary embodiment of the present invention may be implemented with reference to the related specific implementation manner described in connection with fig. 1, which is not described herein.
Furthermore, it should be appreciated that various units in the apparatus for determining the useful life of a wind turbine structural stressed component according to an exemplary embodiment of the invention may be implemented as hardware components and/or as software components. The individual units may be implemented, for example, using a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), depending on the processing performed by the individual units as defined.
An electronic device according to another exemplary embodiment of the present invention includes: a processor (not shown) and a memory (not shown) and a computer program stored on the memory and executable on the processor; the processor, when executing the computer program, implements the method for determining the service life of the stressed component of the wind turbine generator structure according to the above-described exemplary embodiment.
A computer readable storage medium according to an exemplary embodiment of the present invention stores a computer program which, when executed by a processor, causes the processor to perform the method of determining the service life of a stressed component of a wind turbine structure of the above exemplary embodiment. The computer readable storage medium is any data storage device that can store data which can be read by a computer system. Examples of the computer readable storage medium include: read-only memory, random access memory, compact disc read-only, magnetic tape, floppy disk, optical data storage device, and carrier waves (such as data transmission through the internet via wired or wireless transmission paths).
By using the method and the device for determining the service life of the stress component of the wind turbine generator structure according to the exemplary embodiments of the present invention, accurate and rapid assessment of the service life of each stress component of the wind turbine generator at a specific site can be realized, and an advantageous foundation is laid for selecting an appropriate life customization scheme (for example, running according to the most appropriate operating income of the whole wind turbine generator) and an operation and maintenance strategy (for example, monitoring and replacement are performed before the stress components of different wind turbine generator structures reach the determined service life) for the whole wind turbine generator, thereby ensuring maximization of benefits of a wind farm.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (17)
1. A method of determining the useful life of a stressed component of a wind turbine structure, the method comprising:
constructing a safety check index function aiming at a stress part of a wind turbine generator system structure;
determining the service life of the stressed component of the wind turbine generator system structure based on the constructed safety check index function,
wherein the safety check index function is constructed based on the whole design life of the wind turbine generator under the standard design wind parameters, the fatigue material coefficient of the stressed component of the wind turbine generator structure and the service life of the stressed component of the wind turbine generator structure, and is used for representing the corresponding relation between the service life of the stressed component of the wind turbine generator structure and the safety check index,
wherein the wind turbine generator system structural stress component comprises a limited component, wherein the component which needs to acquire a manufacturer side safety check index function corresponding to the estimated service life from the manufacturer of the wind turbine generator system structural stress component is determined as the limited component,
Wherein the safety check index function includes a limited safety check index function corresponding to each of a plurality of estimated service lives,
wherein the service life of the restricted component is determined by: and arranging the estimated service lives in a sequence from large to small, circularly and sequentially obtaining the safety check index of the limited part under the estimated service life based on the limited safety check index function according to the arrangement sequence of the estimated service lives, comparing the obtained safety check index of the limited part under the estimated service life with a first safety index threshold value, stopping circulation until the obtained safety check index is smaller than the first safety index threshold value, and determining the estimated service life corresponding to the obtained safety check index as the minimum value of the service life of the limited part.
2. The method of claim 1, wherein the wind turbine structural load bearing component further comprises an unrestricted component, wherein components that do not require a manufacturer-side safety check index function corresponding to the estimated service life from a manufacturer of the wind turbine structural load bearing component are determined to be unrestricted components.
3. The method of claim 1, wherein obtaining a safety check indicator for the limited component at the estimated service life based on the limited safety check indicator function comprises:
determining a reference load of the limited part based on the whole design life of the wind turbine under standard design wind parameters, the fatigue material coefficient of the stressed part of the wind turbine structure and the estimated service life of the limited part;
substituting the estimated service life of the limited part and the determined reference load into the limited safety check index function to obtain the safety check index of the limited part under the estimated service life.
4. The method of claim 1, wherein, in the case where the wind turbine structural force-receiving component comprises a constrained component, the safety check indicator function is constructed based on a complete machine design life of the wind turbine under standard design wind parameters, fatigue material coefficients of the wind turbine structural force-receiving component, and a service life of the wind turbine structural force-receiving component by:
acquiring manufacturer-side safety check index functions of the limited part under the estimated service lives from manufacturers of the limited part;
And constructing a safety check index function of the limited part under any estimated service life based on the manufacturer side safety check index function of the limited part under any estimated service life, the overall design life of the wind turbine under the standard design wind parameters, the fatigue material coefficient of the limited part and the service life of the limited part.
5. The method of claim 4, wherein the constructing the safety check index function of the limited component at any estimated service life based on the manufacturer-side safety check index function of the limited component at any estimated service life, the overall design life of the wind turbine at standard design wind parameters, the fatigue material coefficient of the limited component, and the service life of the limited component specifically comprises:
acquiring a manufacturer side safety check index function of the limited part under any estimated service life and a fatigue material coefficient of the limited part;
determining a reference load of the limited part when the estimated service life of the limited part is equal to the whole machine design life of the wind turbine under standard design wind parameters based on a manufacturer side safety check index function of the limited part under any estimated service life and a material coefficient of fatigue of the limited part;
Performing function conversion processing on the reference load of the limited part under any estimated service life based on the reference load of the limited part when the estimated service life is equal to the overall design life of the wind turbine generator under the standard design wind parameters, and obtaining a new reference load of the limited part under any estimated service life;
substituting the new reference load into a manufacturer side safety check index function of the limited part under any estimated service life to obtain a safety check index function of the limited part under any estimated service life.
6. The method of claim 2, wherein, in the event that the wind turbine structural load bearing component comprises an unrestricted component, the safety check indicator function comprises an unrestricted safety check indicator function,
wherein the service life of the unrestricted component is determined by:
and under the constraint condition that the unrestricted safety check index function meets a second safety index threshold, determining the maximum value of the service life of the unrestricted component based on the unrestricted safety check index function, and determining the determined maximum value as the service life of the unrestricted component.
7. The method of claim 2, wherein, in the case where the wind turbine structural force-receiving component comprises an unconstrained component, the safety check index function is constructed based on a complete machine design life of the wind turbine under standard design wind parameters, fatigue material coefficients of the wind turbine structural force-receiving component, and a service life of the wind turbine structural force-receiving component by:
acquiring a manufacturer-side safety check index function of the unrestricted component from a manufacturer of the unrestricted component;
and constructing the safety check index function of the unrestricted component based on the manufacturer side safety check index function of the unrestricted component, the overall design life of the wind turbine generator under the standard design wind parameters, the fatigue material coefficient of the unrestricted component and the service life of the unrestricted component.
8. The method of claim 7, wherein constructing the safety check index function of the unrestricted component based on the vendor-side safety check index function of the unrestricted component, a complete machine design life of the wind turbine generator under standard design wind parameters, fatigue material coefficients of the unrestricted component, and a service life of the unrestricted component, specifically comprises:
Determining a reference load of the unrestricted component when the service life of the unrestricted component is equal to the service life of the whole wind turbine under standard design wind parameters based on a manufacturer side safety check index function of the unrestricted component and a fatigue material coefficient of the unrestricted component;
performing function conversion processing on the reference load of the unrestricted component under the service life of the unrestricted component based on the reference load of the unrestricted component when the service life of the unrestricted component is equal to the service life of the whole machine of the wind turbine generator under the standard design wind parameters, and obtaining a new reference load of the unrestricted component under the service life of the unrestricted component;
substituting the new reference load into the manufacturer side safety check index function of the unrestricted component to obtain the safety check index function of the unrestricted component.
9. A method according to claim 3, wherein the reference load comprises at least one of: load persistence distribution, equivalent fatigue load, and markov matrix load.
10. An apparatus for determining the useful life of a stressed component of a wind turbine structure, the apparatus comprising:
the construction unit is used for constructing a safety check index function aiming at a stress part of the wind turbine generator structure;
A service life determining unit for determining the service life of the stressed component of the wind turbine generator structure based on the constructed safety check index function,
wherein the safety check index function is constructed based on the whole design life of the wind turbine generator under the standard design wind parameters, the fatigue material coefficient of the stressed component of the wind turbine generator structure and the service life of the stressed component of the wind turbine generator structure, and is used for representing the corresponding relation between the service life of the stressed component of the wind turbine generator structure and the safety check index,
wherein the wind turbine generator system structural stress component comprises a restricted component, the component determining unit of the device determines a component which needs to acquire a manufacturer-side safety check index function corresponding to the estimated service life from a manufacturer of the wind turbine generator system structural stress component as the restricted component,
wherein the safety check index function includes a limited safety check index function corresponding to each of a plurality of estimated service lives,
wherein the service life determining unit determines the service life of the limited part by: and arranging the estimated service lives in a sequence from large to small, circularly and sequentially obtaining the safety check index of the limited part under the estimated service life based on the limited safety check index function according to the arrangement sequence of the estimated service lives, comparing the obtained safety check index of the limited part under the estimated service life with a first safety index threshold value, stopping circulation until the obtained safety check index is smaller than the first safety index threshold value, and determining the estimated service life corresponding to the obtained safety check index as the minimum value of the service life of the limited part.
11. The apparatus of claim 10, wherein the wind turbine structural load bearing member further comprises an unconstrained member,
the component determining unit determines a component which does not need to acquire a manufacturer-side safety check index function corresponding to the estimated service life from a manufacturer of the stressed component of the wind turbine generator system structure as an unrestricted component.
12. The apparatus of claim 10, wherein the service life determination unit determines a reference load of the limited component based on a complete machine design life of the wind turbine under standard design wind parameters, a fatigue material coefficient of a stressed component of a wind turbine structure, and an estimated service life of the limited component, substitutes the estimated service life of the limited component and the determined reference load into the limited safety check index function, and obtains a safety check index of the limited component under the estimated service life.
13. The apparatus of claim 12, wherein the construction unit is to:
acquiring manufacturer side safety check index functions of the limited part under the estimated service lives;
and constructing a safety check index function of the limited part under any estimated service life based on the manufacturer side safety check index function of the limited part under any estimated service life, the overall design life of the wind turbine under the standard design wind parameters, the fatigue material coefficient of the limited part and the service life of the limited part.
14. The apparatus of claim 11, wherein, in the event that the wind turbine structural load bearing member comprises an unrestricted member, the safety check indicator function comprises an unrestricted safety check indicator function,
wherein the service life determining unit determines the service life of the unrestricted component by:
and under the constraint condition that the unrestricted safety check index function meets a second safety index threshold, determining the maximum value of the service life of the unrestricted component based on the unrestricted safety check index function, and determining the determined maximum value as the service life of the unrestricted component.
15. The apparatus of claim 14, wherein the construction unit constructs the unrestricted safety check indicator function based on a complete machine design life of the wind turbine at standard design wind parameters, fatigue material coefficients of stressed components of the wind turbine structure, a service life of stressed components of the wind turbine structure by:
acquiring a manufacturer-side safety check index function of the unrestricted component from a manufacturer of the unrestricted component;
and constructing the safety check index function of the unrestricted component based on the manufacturer side safety check index function of the unrestricted component, the overall design life of the wind turbine generator under the standard design wind parameters, the fatigue material coefficient of the unrestricted component and the service life of the unrestricted component.
16. An electronic device, the electronic device comprising: a processor, a memory, and a computer program stored on the memory and executable on the processor;
the method of determining the service life of a stressed component of a wind turbine structure as claimed in any one of claims 1 to 9, when said computer program is executed by said processor.
17. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements a method of determining the service life of a stressed component of a wind turbine structure according to any of claims 1 to 9.
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