CN110094308B - Elastic support model selection method for self-adaptive gearbox of low-wind-speed wind turbine generator - Google Patents

Elastic support model selection method for self-adaptive gearbox of low-wind-speed wind turbine generator Download PDF

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CN110094308B
CN110094308B CN201910371449.1A CN201910371449A CN110094308B CN 110094308 B CN110094308 B CN 110094308B CN 201910371449 A CN201910371449 A CN 201910371449A CN 110094308 B CN110094308 B CN 110094308B
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elastic support
frequency
transmission chain
rigidity
rigidity value
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CN110094308A (en
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褚景春
袁凌
周淑梅
李英昌
员一泽
董健
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Guodian United Power Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D15/00—Transmission of mechanical power
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
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Abstract

The invention discloses a low wind speed wind turbine generator self-adaptive gearbox elastic support model selection method, which comprises the following steps: determining a range f of the natural frequency of the transmission chain, wherein the range should avoid the 6 times frequency and the 9 times frequency of the rotor; calculating rigidity value K of transmission chain and vertical rigidity of elastic supportValue K3A range of (d); in determining the vertical stiffness K of the elastic support3According to the requirements of fan load, space and product deformation, and checking and evaluating the bearing capacity of the elastic support, the elastic support with proper rigidity value is determined. And reversely substituting the determined elastic support rigidity value, verifying whether the inherent frequency f of the transmission chain meets the conditions of avoiding 6 times of frequency and 9 times of frequency of the rotor and other times of frequency, if so, indicating that the elastic support model selection is successful, and if not, repeatedly executing the model selection step. According to the invention, through selection of the rigidity value of the elastic support, the proper elastic support of the gear box can be determined, the purpose of avoiding abnormal vibration of the wind turbine generator is achieved, and the vibration condition of the whole transmission chain of the wind turbine generator is good.

Description

Elastic support model selection method for self-adaptive gearbox of low-wind-speed wind turbine generator
Technical Field
The invention relates to the technical field of wind turbines, in particular to a self-adaptive gear box elastic support model selection method for a low-wind-speed wind turbine.
Background
With the continuous increase of installed capacity of wind power and the extension of the running time of a wind power generator, the problems related to vibration are more and more prominent, the requirement on the vibration isolation performance of the wind power generator is continuously improved, and a transmission chain of the wind power generator is an important component of the whole wind power generator, so the quality of the vibration isolation performance of the wind power generator is directly related to the quality of the power generation quality of the wind power generator.
In the wind turbine generator system, the elastic support is used as an important part for bearing the load of the gear box, so that the vibration transmitted to a cabin structure and a tower by the gear box can be effectively reduced. Most importantly, the installation of the elastic support can avoid the dangerous phenomenon of transmission chain resonance, improve the safety performance of the wind turbine generator and prolong the service life of the wind turbine generator.
On the basis, the invention provides a self-adaptive gear box elastic support model selection method for the wind turbine generator, so that a basis is more conveniently provided for the model selection of the elastic support rigidity of the gear box, and favorable support is provided for the vibration reduction of a transmission chain of the wind turbine generator.
Disclosure of Invention
The invention aims to provide a self-adaptive gear box elastic support model selection method for a low-wind-speed wind turbine generator, which provides a basis for the model selection of the elastic support rigidity of a gear box more conveniently and provides favorable support for the vibration reduction of a transmission chain of the generator.
In order to solve the technical problem, the invention provides a model selection method for an adaptive gearbox elastic support of a low-wind-speed wind turbine generator, which comprises the following steps:
(1) determining a range of a natural frequency f of the drive train, which should avoid the rotor frequency 6 times and the frequency 9 times;
(2) calculating the range of the transmission chain rigidity value K, wherein the calculation formula of the transmission chain rigidity value K is as follows:
Figure BDA0002050103250000021
wherein f is the natural frequency of the transmission chain, K is the rigidity value of the transmission chain, and I is the rotational inertia of the transmission chain;
(3) calculating the vertical rigidity K of the elastic support3Range of (1), vertical stiffness value K of said elastic support3The calculation formula of (2) is as follows:
Figure BDA0002050103250000022
wherein, K1For torsional rigidity, K, of the main shaft of the drive chain2For torsional rigidity, K, of gearboxes3Vertical stiffness, K, for elastic support4The torsional rigidity of the coupler is shown, and L is the span of a torsion arm of the gear box;
(4) the vertical stiffness value K of the elastic support determined in the step (3)3According to the requirements of fan load, space and product deformation, selecting the elastic support with better rigidity value.
Further, the calculation formula of the rotational inertia I of the transmission chain is as follows:
Figure BDA0002050103250000023
wherein, I1Is the rotational inertia of the main shaft of the transmission chain I2For the moment of inertia, I, at the low-speed end of the gearbox3Is the sum of the rotational inertia of the high-speed end of the gear box, the brake disc and the coupling, I4And p is the rotational inertia of the generator and the high-low speed ratio of the gear box.
In a further improvement, the range of the natural frequency f of the drive chain is selected from the interval between 120% of the rotor 6 times frequency and 80% of the rotor 9 times frequency, the excitation frequency below 80% of the rotor 6 times frequency, or the excitation frequency above 120% of the rotor 9 times frequency.
And (4) further improving, checking and evaluating the bearing capacity of the elastic support with the better rigidity value determined in the step (4), and determining the elastic support with the proper rigidity value.
Further improving, reversely substituting the determined rigidity value of the elastic support into a calculation formula of the rigidity value K of the transmission chain and a calculation formula of the natural frequency f of the transmission chain, verifying whether the natural frequency f of the transmission chain meets the conditions of avoiding 6 times of frequency, 9 times of frequency and other times of frequency of the rotor, if so, indicating that the elastic support is successfully selected, and if not, repeatedly executing the type selection methods of the steps (1) to (4).
After adopting such design, the invention has at least the following advantages:
according to the invention, the range of the natural frequency of the transmission chain is determined, the elastic support rigidity value is calculated according to a formula, and then the elastic support with the better rigidity value is selected according to the fan load, the space and the product deformation requirements. And checking and evaluating the bearing capacity of the elastic support to determine the elastic support with proper rigidity value. And through reverse substitution, whether the inherent frequency f of the transmission chain meets the conditions of avoiding 6 times of frequency, 9 times of frequency and other times of frequency of the rotor is verified for many times, and finally, a more appropriate elastic support is selected, so that the model selection of the self-adaptive gear box elastic support of the low-wind-speed wind turbine generator is completed, the purpose of avoiding abnormal vibration of the wind turbine generator is achieved, and the vibration condition of the transmission chain of the whole wind turbine generator is good.
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The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
FIG. 1 is a schematic view of the working principle of the gear box elastic support rigidity model selection of the invention.
Detailed Description
Because the wind turbine generator system is after the whole structure of drive chain is confirmed, the influence of whole drive chain natural frequency is mainly decided and adjusted by gear box support rigidity, so this application is based on wind turbine generator system gear box elastic support rigidity selection, through its influence to drive chain rigidity, to the influence of driving wheel natural frequency, reaches and avoids the work excitation frequency, realizes the technical effect of valuing in a safe scope. The specific gearbox elastic support rigidity selection step is as follows.
The self-adaptive gearbox elastic support model selection method for the low-wind-speed wind turbine generator set comprises the following steps:
(1) determining a range of a natural frequency f of the drive train, which should avoid the rotor frequency 6 times and the frequency 9 times; the range of the natural frequency f of the drive train in this embodiment is first selected from the interval of 120% of 6 times the frequency of the rotor to 80% of 9 times the frequency of the rotor.
(2) After the range of the natural frequency f of the transmission chain is determined, the range of the rigidity value K of the transmission chain is calculated, and the calculation formula of the rigidity value K of the transmission chain is shown as the following formula:
Figure BDA0002050103250000041
wherein f is the natural frequency of the transmission chain, K is the rigidity value of the transmission chain, and I is the rotational inertia of the transmission chain.
The calculation formula of the rotational inertia I of the transmission chain is represented by the following formula II:
Figure BDA0002050103250000042
wherein, I1Is the rotational inertia of the main shaft of the transmission chain I2For the moment of inertia, I, at the low-speed end of the gearbox3Is the sum of the rotational inertia of the high-speed end of the gear box, the brake disc and the coupling, I4And p is the rotational inertia of the generator and the high-low speed ratio of the gear box.
(3) After the range of the rigidity value K of the transmission chain is determined, the vertical rigidity value K of the elastic support is calculated3Range of (1), vertical stiffness value K of the elastic support3The calculation formula of (c) is shown as the following formula (c):
Figure BDA0002050103250000043
wherein, K1For torsional rigidity, K, of the main shaft of the drive chain2For torsional rigidity, K, of gearboxes3Vertical stiffness, K, for elastic support4And L is the torsional rigidity of the coupler and the span of the torque arm of the gear box.
(4) The elastic support vertical rigidity value K determined in the step (3)3According to the requirements of fan load, space and product deformation, selecting the elastic support with better rigidity value.
And checking and evaluating the bearing capacity of the elastic support with the better rigidity value, and determining to obtain the elastic support with the proper rigidity value.
The preferred embodiment is that the rigidity value of the elastic support is determined and substituted into the calculation formula of the rigidity value K of the transmission chain and the calculation formula of the inherent frequency f of the transmission chain, whether the inherent frequency f of the transmission chain meets the conditions of avoiding 6 times of frequency, 9 times of frequency and other times of frequency is verified, if so, the elastic support is successfully selected; if not, the type selection method of the steps (1) to (4) is repeatedly executed. And (3) reselecting the excitation frequency of less than 80% of the rotor 6 times of frequency or more than 120% of the rotor 9 times of frequency in the step (1), and continuing the steps (2), (3) and (4) until finally obtaining the elastic support which meets the conditions of avoiding the rotor 6 times of frequency, the rotor 9 times of frequency and other times of frequency, such as a proper rigidity value of 3 times of frequency.
According to the invention, through selection of the elastic support rigidity value, a proper gear box elastic support selection type can be determined, the purpose of avoiding abnormal vibration of the wind turbine generator is achieved, and a favorable support is provided for the good vibration condition of the whole wind turbine generator transmission chain.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.

Claims (3)

1. The model selection method for the self-adaptive gearbox elastic support of the low-wind-speed wind turbine generator is characterized by comprising the following steps of:
(1) determining a range of a natural frequency f of the drive train, which should avoid the rotor frequency 6 times and the frequency 9 times; the range of the natural frequency f of the transmission chain is selected from the interval between 120% of 6 times of the rotor frequency and 80% of 9 times of the rotor frequency, the excitation frequency below 80% of 6 times of the rotor frequency, or the excitation frequency above 120% of 9 times of the rotor frequency;
(2) calculating the range of the transmission chain rigidity value K, wherein the calculation formula of the transmission chain rigidity value K is as follows:
Figure FDA0002666415600000011
Figure FDA0002666415600000012
wherein f is the natural frequency of the transmission chain, K is the rigidity value of the transmission chain, I is the rotational inertia of the transmission chain, and I is the rotational inertia of the transmission chain1Is the rotational inertia of the main shaft of the transmission chain I2For the moment of inertia, I, at the low-speed end of the gearbox3Is the sum of the rotational inertia of the high-speed end of the gear box, the brake disc and the coupling, I4The moment of inertia of the generator is defined, and p is the high-low speed ratio of the gear box;
(3) calculating the vertical rigidity K of the elastic support3Range of (1), vertical stiffness value K of said elastic support3The calculation formula of (2) is as follows:
Figure FDA0002666415600000013
wherein, K1For torsional rigidity, K, of the main shaft of the drive chain2For torsional rigidity, K, of gearboxes3Vertical stiffness, K, for elastic support4The torsional rigidity of the coupler is shown, and L is the span of a torsion arm of the gear box;
(4) the vertical stiffness value K of the elastic support determined in the step (3)3According to the requirements of fan load, space and product deformation, selecting the elastic support with better rigidity value.
2. The model selection method for the elastic support of the self-adaptive gearbox of the low-wind-speed wind turbine generator system according to claim 1, characterized by comprising the step of carrying out bearing capacity checking and evaluation on the elastic support with the better rigidity value determined in the step (4) and determining the elastic support with the proper rigidity value.
3. The self-adaptive gearbox elastic support model selection method for the low wind speed wind turbine generator system according to claim 2, characterized by reversely substituting the determined rigidity value of the elastic support into a calculation formula of the transmission chain rigidity value K and a calculation formula of the transmission chain natural frequency f, verifying whether the transmission chain natural frequency f meets the conditions of avoiding 6 times of frequency and 9 times of frequency of the rotor, if so, indicating that the elastic support model selection is successful, and if not, repeatedly executing the model selection methods of the steps (1) to (4).
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