CN108978736B - Method and system for determining design load of foundation ring of wind turbine generator - Google Patents
Method and system for determining design load of foundation ring of wind turbine generator Download PDFInfo
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Abstract
The invention provides a method and a system for determining design load of a foundation ring of a wind turbine generator, wherein the method for determining the design load of the foundation ring of the wind turbine generator comprises the following steps: establishing a simulation model of the wind turbine generator, and carrying out simulation calculation on the simulation model of the wind turbine generator according to design requirements to obtain a time sequence design load of the tower bottom of the wind turbine generator under the extreme working condition; and calculating the dominant design load of the transient design load and the dominant design load of the continuous design load of the foundation base ring of the wind turbine generator, and taking the design load corresponding to the larger one as the limit design load of the foundation base ring of the wind turbine generator. According to the technical scheme provided by the invention, various factors influencing the design load of the foundation ring of the wind turbine generator are comprehensively considered, so that the influence of the non-dominant design load on the design load can be effectively avoided, and the design load is safer and more reliable.
Description
Technical Field
The invention belongs to the technical field of wind power generation equipment, and particularly relates to a method and a system for determining design load of a foundation ring of a wind turbine generator.
Background
With the improvement of the loading capacity of the wind turbine generator in recent years, the diameter of the wind wheel of the wind turbine generator is gradually increased, the height of the hub is gradually increased, the consumption of the foundation in the wind turbine generator is also sharply increased, and the proportion of the foundation in the total investment of the wind turbine generator is also gradually increased.
For the foundation of the foundation ring type wind turbine generator, design loads of a tower cylinder and a host are transmitted to the foundation through the foundation ring. The foundation ring is a steel part embedded in the foundation concrete, is a transition member connected with the foundation and the steel tower, and is also a key member connected with the foundation and the tower. At the tower bottom, the wind turbine generator system has large designed load bending moment, and the foundation ring needs to have the capacity of transferring huge bending moment and can meet the requirements on the bearing capacity such as pulling resistance. The thickness of the concrete at the bottom of the foundation ring, the thickness of the concrete at the upper part of the flange at the bottom of the foundation ring and the arrangement just before are all important influences on the safety of the foundation ring foundation.
In the prior art, the limit conditions of all working conditions are considered when the design load of the foundation base ring of the wind turbine generator is calculated, namely all variables are maximum values, then the maximum values of all the variables are combined, so that the calculated result considers that the factors are not comprehensive enough and the actual design load bearing capacity of the foundation base ring of the wind turbine generator has a large error, the designed base consumption is too conservative under the design load condition, and the optimal economic benefit of the wind turbine generator cannot be realized.
Disclosure of Invention
The invention aims to provide a method and a system for determining design load of a foundation base ring of a wind turbine generator, which are used for solving the problem that when the design load of the foundation base ring of the wind turbine generator is calculated in the prior art, large errors exist between calculation results and actual results due to incomplete consideration factors.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a method for determining design load of a foundation ring of a wind turbine generator comprises the following steps:
(1) establishing a simulation model of the wind turbine generator, and carrying out simulation calculation on the simulation model of the wind turbine generator according to design requirements to obtain a time sequence design load of the tower bottom of the wind turbine generator under the extreme working condition;
(2) and calculating the dominant design load of the transient design load and the dominant design load of the continuous design load of the foundation base ring of the wind turbine generator, and taking the design load corresponding to the larger one as the initial limit design load of the foundation base ring of the wind turbine generator.
According to the technical scheme provided by the invention, the continuous design load and the transient design load of the wind turbine generator foundation base ring are firstly calculated, and the initial limit design load is based on the condition that the dominant design load of the continuous design load and the transient design load is larger. According to the technical scheme provided by the invention, various factors influencing the design load of the foundation ring of the wind turbine generator are comprehensively considered, so that the influence of the non-dominant design load on the design load can be effectively avoided, and the design load is safer and more reliable.
As a further improvement on the continuous design load of the basic ring, the time sequence design load of the tower bottom of the wind turbine generator set under the limit working condition is screened and calculated to obtain the design load of the tower bottom under the normal working condition, the operation and maintenance working condition and the start-stop working condition, and the maximum value of the design load is used as the continuous design load of the basic ring.
As a further improvement on the transient design load of the foundation ring, the transient design load of the foundation ring refers to the maximum design load of the tower bottom of the wind turbine generator under the fault working condition and the limit wind speed.
As a further improvement on the limit torque of the foundation ring, the method also comprises the steps of calculating an additional bending moment generated by foundation settlement and tower eccentricity; and adding the additional bending moment into the initial limit design load of the foundation base ring of the wind turbine generator to obtain the final limit torque of the foundation ring.
As a further improvement on the additional torque, if the height of the tower barrel of the wind turbine generator is increased by one meter, the eccentric displacement of the gravity center of the tower barrel is increased by delta s, the eccentric displacement of the gravity center of the tower barrel is increased to delta m due to the processing and manufacturing errors of the tower barrel, and the weight of the ith tower barrel is GiLength of liN tower barrels, the total height of the tower barrels is l, and the weight of a cabin assembly of the wind wheel is GtThen, the additional bending moment generated by foundation settlement and tower eccentricity is:
AddT＝(Δs+Δm)[(G1l1+G2(l1+l2)+…+Gn(l1+l2+…+ln)+Gt*l]。
as a further improvement of the calculation method of the final limit torque of the basic ring, the initial limit design load of the basic ring is set as Mxs、Mys、Mxys、MzsWith an additional bending moment AddTThe resulting final ultimate torque of the foundation ring is then:
Mx＝Mxs+AddT
My＝Mys+AddT
Mz＝Mzs。
in order to determine the fatigue design load of the foundation base ring of the wind turbine generator, the method further comprises the following steps:
carrying out simulation calculation on the wind turbine generator simulation model according to design requirements to obtain a time series design load of the tower bottom of the wind turbine generator under a fatigue working condition;
dividing the time series design load of the tower bottom of the wind turbine generator set under the fatigue working condition into intervals with set number, and calculating the weighted average value of the fatigue design load according to the time corresponding to each interval;
calculating the equivalent fatigue design load of the foundation ring of the wind turbine generator by adopting a rain flow counting method;
and taking the weighted average of the fatigue design loads as an average value, and calculating the final fatigue design load by combining the equivalent fatigue design load of the foundation base ring of the wind turbine generator.
As a further improvement to the fatigue design load weighted average, the set number is n, wherein the ith interval is biniCorresponding to time tiI is more than 0 and less than or equal to n; the weighted mean of the fatigue design loads is:
as a further improvement to the equivalent fatigue design load, the design load amplitude of the ith interval is set as rangiThe corresponding number of rain flow cycles is cyclesiAnd if the equivalent cycle number of the fatigue design load is N, the equivalent fatigue design load corresponding to the slope m in the S-N curve is as follows:
a system for determining a design load of a foundation base ring of a wind turbine generator comprises a memory and a processor, wherein the memory is stored with a computer program for executing on the processor; when the processor executes the computer program, the following steps are realized:
(1) establishing a simulation model of the wind turbine generator, and carrying out simulation calculation on the simulation model of the wind turbine generator according to design requirements to obtain a time sequence design load of the tower bottom of the wind turbine generator under the extreme working condition;
(2) and calculating the dominant design load of the transient design load and the dominant design load of the continuous design load of the foundation base ring of the wind turbine generator, and taking the design load corresponding to the larger one as the initial limit design load of the foundation base ring of the wind turbine generator.
According to the technical scheme provided by the invention, the continuous design load and the transient design load of the wind turbine generator foundation base ring are firstly calculated, and the initial limit design load is based on the condition that the dominant design load of the continuous design load and the transient design load is larger. According to the technical scheme provided by the invention, various factors influencing the design load of the foundation ring of the wind turbine generator are comprehensively considered, so that the influence of the non-dominant design load on the design load can be effectively avoided, and the design load is safer and more reliable.
As a further improvement on the continuous design load of the basic ring, the time sequence design load of the tower bottom of the wind turbine generator set under the limit working condition is screened and calculated to obtain the design load of the tower bottom under the normal working condition, the operation and maintenance working condition and the start-stop working condition, and the maximum value of the design load is used as the continuous design load of the basic ring.
As a further improvement on the transient design load of the foundation ring, the transient design load of the foundation ring refers to the maximum design load of the tower bottom of the wind turbine generator under the fault working condition and the limit wind speed.
As a further improvement on the limit torque of the foundation ring, the method also comprises the steps of calculating an additional bending moment generated by foundation settlement and tower eccentricity; and adding the additional bending moment into the initial limit design load of the foundation base ring of the wind turbine generator to obtain the final limit torque of the foundation ring.
As a further improvement on the additional torque, if the height of the tower barrel of the wind turbine generator is increased by one meter, the eccentric displacement of the gravity center of the tower barrel is increased by delta s, the eccentric displacement of the gravity center of the tower barrel is increased to delta m due to the processing and manufacturing errors of the tower barrel, and the weight of the ith tower barrel is GiLength of liN tower barrels, the total height of the tower barrels is l, and the weight of a cabin assembly of the wind wheel is GtThen, the additional bending moment generated by foundation settlement and tower eccentricity is:
AddT＝(Δs+Δm)[(G1l1+G2(l1+l2)+…+Gn(l1+l2+…+ln)+Gt*l]。
as a further improvement of the calculation method of the final limit torque of the basic ring, the initial limit design load of the basic ring is set as Mxs、Mys、Mxys、MzsWith an additional bending moment AddTThe resulting final ultimate torque of the foundation ring is then:
Mx＝Mxs+AddT
My＝Mys+AddT
Mz＝Mzs。
in order to determine the fatigue design load of the foundation base ring of the wind turbine generator, the method further comprises the following steps:
carrying out simulation calculation on the wind turbine generator simulation model according to design requirements to obtain a time series design load of the tower bottom of the wind turbine generator under a fatigue working condition;
dividing the time series design load of the tower bottom of the wind turbine generator set under the fatigue working condition into intervals with set number, and calculating the weighted average value of the fatigue design load according to the time corresponding to each interval;
calculating the equivalent fatigue design load of the foundation ring of the wind turbine generator by adopting a rain flow counting method;
and taking the weighted average of the fatigue design loads as an average value, and calculating the final fatigue design load by combining the equivalent fatigue design load of the foundation base ring of the wind turbine generator.
As a further improvement to the fatigue design load weighted average, the set number is n, wherein the ith interval is biniCorresponding to time tiI is more than 0 and less than or equal to n; the weighted mean of the fatigue design loads is:
as a further improvement to the equivalent fatigue design load, the design load amplitude of the ith interval is set as rangiThe corresponding number of rain flow cycles is cyclesiAnd if the equivalent cycle number of the fatigue design load is N, the equivalent fatigue design load corresponding to the slope m in the S-N curve is as follows:
drawings
FIG. 1 is a step of a wind turbine foundation ring limit design load determination method in an embodiment of the method;
FIG. 2 is a flowchart illustrating an exemplary implementation of a method for determining a design load of a foundation ring of a wind turbine generator in an embodiment of the method;
FIG. 3 is a schematic diagram of a load applied by a wind turbine generator in the method embodiment.
Detailed Description
The invention aims to provide a method and a system for determining design load of a foundation base ring of a wind turbine generator, which are used for solving the problem that when the design load of the foundation base ring of the wind turbine generator is calculated in the prior art, large errors exist between calculation results and actual results due to incomplete consideration factors.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a method for determining design load of a foundation ring of a wind turbine generator comprises the following steps:
(1) establishing a simulation model of the wind turbine generator, and carrying out simulation calculation on the simulation model of the wind turbine generator according to design requirements to obtain a time sequence design load of the tower bottom of the wind turbine generator under the extreme working condition;
(2) and calculating the dominant design load of the transient design load and the dominant design load of the continuous design load of the foundation base ring of the wind turbine generator, and taking the design load corresponding to the larger one as the initial limit design load of the foundation base ring of the wind turbine generator.
The following further describes embodiments of the present invention with reference to the drawings.
The embodiment provides a method for determining design load of a foundation base ring of a wind turbine generator, which is used for calculating the design load of the foundation base ring of the wind turbine generator and providing data support for design of the foundation base ring of the wind turbine generator.
The method for determining the design load of the foundation ring of the wind turbine generator provided by the embodiment is mainly implemented by the following steps, as shown in fig. 1:
(1) establishing a simulation model of the wind turbine generator, and calculating a time sequence design load under the tower bottom limit working condition of the wind turbine generator;
(2) building a mathematical calculation model for calculating the design load of the foundation ring of the wind turbine generator, and calculating the initial limit design load of the foundation ring according to the design requirement;
(3) and (3) building a mathematical calculation model for calculating the design load of the foundation ring of the wind turbine generator, and calculating the fatigue design load of the foundation ring according to the design requirement.
The specific implementation method of the above steps is shown in fig. 2, and specifically includes:
in the step (1), the established wind turbine generator simulation model is a blanked simulation model of the wind turbine generator, relevant parameters of a prototype part of the wind turbine generator are led into the simulation model, and a wind turbine generator simulation model with the function equivalent to that of the prototype part of the wind turbine generator is established; according to design requirements, simulation calculation is carried out on the wind turbine generator simulation model under the limit working condition to obtain the design load M of the tower bottom of the wind turbine generator under the limit working conditionx、My、Mxy、Mz、Fx、Fy、Fxy、FzTime series design load of (1), as shown in FIG. 3, where Mx、My、MzRespectively representing the moment in the direction of axis X, Y, Z, Fx、Fy、FzRespectively representing forces in the direction of axis X, Y, Z, MxyShowing the resultant moments in the X-and Y-directions, FxyThe resultant moment in the X-axis direction and the Y-axis direction is shown. In this embodiment, the wind turbine limit condition setting condition is determined according to the specification of the wind turbine authentication guideline GL, and the set external condition and the set running state of the wind turbine simulate the actual bearing condition of the wind turbine as much as possible.
In the step (2), firstly, screening time series design loads of the tower bottom under the limit working condition to obtain design loads of the tower bottom under the normal working condition, the operation and maintenance working condition and the start-stop working condition, and taking the maximum design load as the continuous design load of the basic ring; then, calculating the design loads of the tower bottom under the fault working condition and the limiting wind speed, and taking the larger design load as the transient design load of the foundation ring; and finally comparing the continuous design load of the foundation ring with the dominant design load of the transient design load, and taking the design load with larger dominant design load as the initial limit design load of the foundation ring.
In order to eliminate the gravity center offset of the tower caused by manufacturing and installation errors and foundation settlement, the method for determining the ultimate design load of the foundation ring of the wind turbine generator provided by the embodiment further comprises the following steps:
if the height of the tower of the wind turbine generator is increased by one meter every timeThe eccentric displacement of the center of gravity is increased by deltas, and the eccentric displacement of the center of gravity of the tower barrel is increased to deltam due to the processing and manufacturing errors of the tower barrel; let the i-th tower have a weight of GiLength of liN tower barrels, the total height of the tower barrels is l, and the weight of a cabin assembly of the wind wheel is GtThen, the additional bending moment generated by foundation settlement and tower eccentricity is:
AddT＝(Δs+Δm)[(G1l1+G2(l1+l2)+…+Gn(l1+l2+…+ln)+Gt*l]。
setting the calculated basic initial limit design load Mxs、Mys、Mxys、MzsThe limit torque of the base ring is then:
Mx＝Mxs+AddT
My＝Mys+AddT
Mz＝Mzs。
in the step (3), the time distribution condition of the fatigue design load is determined by counting the time series design load condition of the tower bottom under the fatigue working condition, wherein the design load is referred to as LDD design load for short; giving time to each fatigue simulation working condition according to standard Rayleigh distribution or wind speed frequency distribution of a wind power plant to be built, equally dividing time sequence design load of the tower bottom under the fatigue working condition into n intervals according to the size, and setting the ith interval as biniThe time corresponding to the interval is tiAnd i is more than 0 and less than or equal to n, the weighted mean value of the tower bottom fatigue design load is as follows:
calculating the equivalent fatigue design load of the foundation base ring of the wind turbine generator by adopting a rain flow counting methodWhen the time sequence design load at the tower bottom under the fatigue working condition is subjected to rain flow counting statistics, the design load amplitude of the ith interval is designed as rangiThe corresponding number of rain flow cycles is cyclesiAnd if the equivalent cycle number of the fatigue design load is N, the equivalent fatigue design load corresponding to the slope m in the S-N curve is as follows:
wherein
Is ran giThe m-th power of (a), the S-N curve, is a curve having the fatigue load strength as the ordinate and the fatigue life logarithm as the abscissa.
The weighted mean value and the equivalent fatigue design load are calculated from the time series design load of the tower bottom under the fatigue working condition, the weighted mean value is used for measuring the fluctuation benchmark of the load of the foundation ring, namely the load fluctuates up and down near the weighted mean value, the equivalent fatigue design load reflects more times of load fluctuation and the amplitude of fluctuation, and the two are combined to determine the fatigue design load of the foundation ring. Therefore, the weighted average of the fatigue design loads is used as an average value, and the final fatigue design load is calculated by combining the equivalent fatigue design load of the foundation base ring of the wind turbine generator.
The embodiment of the system is as follows:
the embodiment provides a system for determining design load of a foundation ring of a wind turbine generator, which comprises a memory and a processor, wherein the memory is stored with a computer program for being executed on the processor; the processor, when executing the computer program stored on the memory, performs the steps of determining the design load of the wind turbine foundation base ring as provided in the method embodiments.
Claims (2)
1. A method for determining design load of a foundation ring of a wind turbine generator is characterized by comprising the following steps:
(1) establishing a simulation model of the wind turbine generator, and carrying out simulation calculation on the simulation model of the wind turbine generator according to design requirements to obtain a time sequence design load of the tower bottom of the wind turbine generator under the extreme working condition;
(2) calculating the dominant design load of the transient design load and the dominant design load of the continuous design load of the foundation base ring of the wind turbine generator, and taking the design load corresponding to the larger one of the dominant design load and the continuous design load as the initial limit design load of the foundation base ring of the wind turbine generator;
screening and calculating time series design loads of the tower bottom of the wind turbine generator set under the limit working condition to obtain design loads of the tower bottom under the normal working condition, the operation and maintenance working condition and the start-stop working condition, and taking the maximum value as the continuous design load of the basic ring;
the transient design load of the foundation ring refers to the maximum design load of the tower bottom of the wind turbine generator under the fault working condition and the limit wind speed;
calculating additional bending moment generated by foundation settlement and tower eccentricity; adding the additional bending moment into the initial limit design load of the foundation base ring of the wind turbine generator to obtain the final limit torque of the foundation base ring;
if the height of the tower drum of the wind turbine generator is increased by one meter, the eccentric displacement of the gravity center of the tower drum is increased by delta s, the eccentric displacement of the gravity center of the tower drum is increased to delta m due to the processing and manufacturing errors of the tower drum, and the weight of the ith tower drum is GiLength of liN tower barrels, the total height of the tower barrels is l, and the weight of a cabin assembly of the wind wheel is GtThen, the additional bending moment generated by foundation settlement and tower eccentricity is:
AddT＝(Δs+Δm)[(G1l1+G2(l1+l2)+…+Gn(l1+l2+…+ln)+Gt*l]；
setting the initial limit design load of the foundation ring to Mxs、Mys、Mxys、MzsWith an additional bending moment AddTThe resulting final ultimate torque of the foundation ring is then:
Mx＝Mxs+AddT
My＝Mys+AddT
Mz＝Mzs；
also comprises the following steps:
carrying out simulation calculation on the wind turbine generator simulation model according to design requirements to obtain a time series design load of the tower bottom of the wind turbine generator under a fatigue working condition;
dividing the time series design load of the tower bottom of the wind turbine generator set under the fatigue working condition into intervals with set number, and calculating the weighted average value of the fatigue design load according to the time corresponding to each interval;
calculating the equivalent fatigue design load of the foundation ring of the wind turbine generator by adopting a rain flow counting method;
calculating the final fatigue design load by taking the weighted average value of the fatigue design load as an average value and combining the equivalent fatigue design load of the foundation base ring of the wind turbine generator;
the set number is n, wherein the ith interval is biniCorresponding to time tiI is more than 0 and less than or equal to n; the weighted mean of the fatigue design loads is:
setting the design load amplitude of the ith interval as rangiThe corresponding number of rain flow cycles is cyclesiAnd if the equivalent cycle number of the fatigue design load is N, the equivalent fatigue design load corresponding to the slope m in the S-N curve is as follows:
2. a system for determining a design load of a foundation base ring of a wind turbine generator comprises a memory and a processor, wherein the memory is stored with a computer program for executing on the processor; wherein the processor, when executing the computer program, implements the steps of:
(1) establishing a simulation model of the wind turbine generator, and carrying out simulation calculation on the simulation model of the wind turbine generator according to design requirements to obtain a time sequence design load of the tower bottom of the wind turbine generator under the extreme working condition;
(2) calculating the dominant design load of the transient design load and the dominant design load of the continuous design load of the foundation base ring of the wind turbine generator, and taking the design load corresponding to the larger one of the dominant design load and the continuous design load as the initial limit design load of the foundation base ring of the wind turbine generator;
screening and calculating time series design loads of the tower bottom of the wind turbine generator set under the limit working condition to obtain design loads of the tower bottom under the normal working condition, the operation and maintenance working condition and the start-stop working condition, and taking the maximum value as the continuous design load of the basic ring;
the transient design load of the foundation ring refers to the maximum design load of the tower bottom of the wind turbine generator under the fault working condition and the limit wind speed;
calculating additional bending moment generated by foundation settlement and tower eccentricity; adding the additional bending moment into the initial limit design load of the foundation base ring of the wind turbine generator to obtain the final limit torque of the foundation base ring;
if the height of the tower drum of the wind turbine generator is increased by one meter, the eccentric displacement of the gravity center of the tower drum is increased by delta s, the eccentric displacement of the gravity center of the tower drum is increased to delta m due to the processing and manufacturing errors of the tower drum, and the weight of the ith tower drum is GiLength of liN tower barrels, the total height of the tower barrels is l, and the weight of a cabin assembly of the wind wheel is GtThen, the additional bending moment generated by foundation settlement and tower eccentricity is:
AddT＝(Δs+Δm)[(G1l1+G2(l1+l2)+…+Gn(l1+l2+…+ln)+Gt*l]；
setting the initial limit design load of the foundation ring to Mxs、Mys、Mxys、MzsWith an additional bending moment AddTThen obtainThe base ring final ultimate limiting torque of (a):
Mx＝Mxs+AddT
My＝Mys+AddT
Mz＝Mzs；
also comprises the following steps:
carrying out simulation calculation on the wind turbine generator simulation model according to design requirements to obtain a time series design load of the tower bottom of the wind turbine generator under a fatigue working condition;
dividing the time series design load of the tower bottom of the wind turbine generator set under the fatigue working condition into intervals with set number, and calculating the weighted average value of the fatigue design load according to the time corresponding to each interval;
calculating the equivalent fatigue design load of the foundation ring of the wind turbine generator by adopting a rain flow counting method;
calculating the final fatigue design load by taking the weighted average value of the fatigue design load as an average value and combining the equivalent fatigue design load of the foundation base ring of the wind turbine generator;
the set number is n, wherein the ith interval is biniCorresponding to time tiI is more than 0 and less than or equal to n; the weighted mean of the fatigue design loads is:
setting the design load amplitude of the ith interval as rangiThe corresponding number of rain flow cycles is cyclesiAnd if the equivalent cycle number of the fatigue design load is N, the equivalent fatigue design load corresponding to the slope m in the S-N curve is as follows:
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