CN106286151B - A kind of Wind turbines slow-speed shaft torsional load monitoring method and loading analysis method - Google Patents
A kind of Wind turbines slow-speed shaft torsional load monitoring method and loading analysis method Download PDFInfo
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- CN106286151B CN106286151B CN201610742765.1A CN201610742765A CN106286151B CN 106286151 B CN106286151 B CN 106286151B CN 201610742765 A CN201610742765 A CN 201610742765A CN 106286151 B CN106286151 B CN 106286151B
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- 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
- F05B2260/84—Modelling or simulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/331—Mechanical loads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/335—Output power or torque
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
It includes: the relational model 1) pre-established between the torsional load of slow-speed shaft and the torque of generator that the present invention, which discloses a kind of Wind turbines slow-speed shaft torsional load monitoring method and loading analysis method, the monitoring method step,；2) real time datas such as the given torque of generator, revolving speed during real-time acquisition target running of wind generating set, and the torsional load of target Wind turbines slow-speed shaft is obtained according to the relational model that step 1) is established；The torsional load of the loading analysis method monitoring objective Wind turbines slow-speed shaft, the torsional load progress loading analysis based on the slow-speed shaft that above procedure monitors.The present invention can real-time monitoring obtain the torsional load of Wind turbines slow-speed shaft, and have many advantages, such as that implementation method is simple, obtain precision without complex calculation, required at low cost and load and high-efficient.
Description
Technical field
The present invention relates to technical field of wind power generation more particularly to a kind of Wind turbines slow-speed shaft torsional load monitoring methods
And loading analysis method.
Background technique
Slow-speed shaft torsional load is to be transmitted to slow-speed shaft by wheel hub by wind wheel aerodynamic moment in wind power generating set, in turn
Drive the torsional moment of gear-box operating.The transmission chain system of trunnion axis double-fed wind power generator group includes wind wheel, slow-speed shaft, tooth
Roller box, high speed shaft and generator, wherein slow-speed shaft is directly connect with wind wheel, and wind wheel rotates under the action of the wind, via slow-speed shaft
Torsional load (i.e. torsion driving moment) is passed into gear-box, is then generated electricity by gear-box and high speed axle driven dynamo.
It is directed to the acquisition of slow-speed shaft torsional load at present, a kind of method is based on theoretical calculating, such method is to be based on
The torsional load of slow-speed shaft is derived from blade of wind-driven generator, thus can theoretically pass through wind speed, the blade on wind wheel face
Aerofoil profile, aerodynamics basic theories or wind wheel azimuth etc. carry out aerodynamic loading calculating, then by load transmission relationship into
Row is calculated and is acquired, but this kind of method based on theoretical calculation, and required design conditions obtain difficulty, and computation complexity
Height is not suitable in practical engineering application；Another is then by adding load measurement equipment directly to be measured, more
Common method is the increase torque strain acquirement device on main bearing seat, and the load of torsional direction is converted by data processing
Lotus, but the required equipment for load test is not the standard configuration of Wind turbines, thus mode is stated using this and obtains low speed
Axis torsional load can bring biggish cost input.
Summary of the invention
The technical problem to be solved in the present invention is that, for technical problem of the existing technology, the present invention provides one
Kind implementation method is simple, obtains precision and high-efficient wind-powered electricity generation without complex calculation, required at low cost and slow-speed shaft torsional load
Unit slow-speed shaft torsional load monitoring method and loading analysis method.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
A kind of Wind turbines slow-speed shaft torsional load monitoring method, step include:
1) relational model between the torsional load of slow-speed shaft and the torque of generator is pre-established；
2) in real time obtain target running of wind generating set during generator given torque, and according to the step 1) establish
Relational model obtain the torsional load of target Wind turbines slow-speed shaft.
Further improvement as monitoring method of the present invention: the torque of the torsional load for establishing slow-speed shaft and generator
Between relational model specific steps are as follows: using multi-body dynamics modeling analysis method to the transmission chain systems of Wind turbines into
Row parametrization is equivalent, and foundation obtains Wind turbines drive model；Construct the kinetics equation of the Wind turbines drive model, base
The relational model between the torsional load of slow-speed shaft and the torque of generator is established in the kinetics equation of building.
As the further improvement of monitoring method of the present invention, between the torsional load of the slow-speed shaft and the torque of generator
Relational model expression formula are as follows:
Wherein, JtEquivalent turn for being formed by the first equivalent mass block for blade, wheel hub and slow-speed shaft rotary inertia lump
Dynamic inertia, θtFor the absolute angular displacement of the first equivalent mass block, J0It is formed when by by gear-box conversion to defeated high speed shaft end
The second equivalent mass block rotary inertia, θ0For the absolute angular displacement of the second equivalent mass block, JgFor turning on high speed shaft
Dynamic inertia and generator amature rotary inertia lump are formed by the equivalent moment of inertia of third equivalent mass block, θgIt is described
The absolute angular displacement of three equivalent mass blocks, Klss、KhssThe respectively elastic torsion stiffness coefficient of slow-speed shaft, high speed shaft, Clss、Chss
The respectively axis damped coefficient of slow-speed shaft, high speed shaft, N=NηAnd NηFor the gear ratio of gear-box；,TgGiven for generator turns
Square, TmFor the torsional load of slow-speed shaft；
AndωtIt is described first etc.
Imitate the angular speed of mass block disk, ω0For the angular speed of the second equivalent mass block disk, ωgFor the third equivalent quality
The angular speed of block disk.
As the further improvement of monitoring method of the present invention, between the torsional load of the slow-speed shaft and the torque of generator
Relational model establishment step are as follows:
1.11) simplified Wind turbines drive model is established: by blade, wheel hub and slow-speed shaft in wind turbine generator drive system
Rotary inertia lump form an equivalent mass block disk, constitute the first equivalent mass block disk；Gear-box is rotated
Inertia is converted to the high speed shaft end of output and forms an equivalent mass block disk, and the second equivalent mass block disk is constituted；With
And by high speed shaft rotary inertia and generator amature rotary inertia lump be an equivalent mass disk, constitute the third
Equivalent mass block disk；
1.12) construction force equation: the Wind turbines drive model construction force side that the step 1.11) is established
Journey；
Generalized external force based on the first equivalent mass block disk is the torsional load T at low speed endmEstablish the first equation:
There was only system internal force based on the second equivalent mass block disk, establish second equation without system external force:
Generalized external force based on the third equivalent mass block disk is electromagnetic torque-NpTeEstablish third equation:
Wherein, NpFor the number of pole-pairs of generator；
1.13) relational model between the torsional load of slow-speed shaft and the torque of generator is established:
It enablesTg=NpTe, and by described
The first equation, second equation and the third equation that step 1.12) is established obtain the torsional load and generator of the slow-speed shaft
Torque between relational model.
As the further improvement of monitoring method of the present invention, the step 1) further includes model verifying step afterwards, before step 2)
Suddenly, specific steps are as follows: the torsional load to the slow-speed shaft and the relational model between the torque of generator carry out mode solution,
Obtain the system frequency based on model；By system reference intrinsic frequency to it is described based on the system frequency of model into
Row verifying is then transferred to if the verification passes and executes step 2).
As the further improvement of monitoring method of the present invention, the specific steps of the mode solution are as follows:
1.21) relational model between the torsional load of the slow-speed shaft and the torque of generator is transformed to four directions
Journey:
WhereinFor mass matrix,For stiffness matrix,
Q is angular displacement,For acceleration；
1.22) the 4th equation that the step 1.21) transformation obtains is deformed into the 5th equation:
Wherein ω is angular frequency,For angular speed,For acceleration；
System frequency f based on model is obtained by the 5th equation solution.
As the further improvement of monitoring method of the present invention, to the system based on model in the model verification step
The specific steps that intrinsic frequency is verified are as follows: by the reference intrinsic frequency of the system frequency based on model and system
It is compared, if the deviation of the two is within a preset range, is verified.
As the further improvement of monitoring method of the present invention, the specific steps of the step 2) are as follows:
2.1) referred to by Condition Monitoring Data, operation during SCADA system acquisition running of wind generating set in Wind turbines
Data are enabled, the given torque T of generator is obtainedg, the revolving speed of revolving speed and slow-speed shaft, high speed shaft revolving speed；
2.2) torsional angular displacement and rotation acceleration, low speed of generator are calculated according to the data that the step 2.1) obtains
The torsional angular displacement of axis and the torsional angular displacement and rotation acceleration of torsion acceleration and high speed shaft, it is equivalent to obtain described first
The absolute angular displacement of mass block diskt, the second equivalent mass block disk absolute angular displacement0And the third equivalent
The absolute angular displacement of mass block diskg；
2.3) relational model that data, the step 1) obtained according to the step 2.2) is established obtains target wind turbine
The torsional load of group slow-speed shaft.
The present invention further provides a kind of load of wind turbine generator analysis method, step includes:
According to slow-speed shaft torsional load in above-mentioned monitoring method monitoring objective Wind turbines；
Loading analysis is carried out to transmission system in target Wind turbines based on the slow-speed shaft torsional load monitored.
Compared with the prior art, the advantages of the present invention are as follows:
1) the present invention is based on Wind turbines to be driven realization principle, by establishing the torsional load of slow-speed shaft and turning for generator
Relational model between square gets the given of generator during running of wind generating set by the relational model established and in real time
Torque obtains the torsional load of Wind turbines slow-speed shaft, to realize inverse by transmission system high speed end generator torsional torque
To the driving torque for obtaining driving end, the torsional load for being not easy to the slow-speed shaft of measurement is obtained, implementation method is simple, without complexity
Operation and aided-detection device, the torsional load precision of slow-speed shaft required at low cost and obtained and high-efficient；
2) present invention further establishes Wind turbines drive model by multi-body dynamics modeling analysis method, and passes through pair
The Wind turbines drive model construction force equation of foundation obtains between the torsional load of slow-speed shaft and the torque of generator
Relational model is verified, energy by transmission realization principle and dynamics modal analysis method in wind turbine generator drive system
Enough establish obtains the model of high reliablity；
3) present invention is obtained further directly based on the data of SCADA system based on Wind turbines self-operating data
Slow-speed shaft torsional load value is taken, without increasing load measuring cell or other equipment, slow-speed shaft torsional load value can be realized
Real time on-line monitoring, the dependence needed for capable of utmostly reducing in slow-speed shaft torsional load monitoring process to hardware condition；
4) present invention is by carrying out Wind turbines real-time monitoring, the real-time slow-speed shaft monitored to slow-speed shaft torsional load
Torsional load value provides for the carrying of the critical components such as main shaft, gear-box, resilient support and Analysis on Cyclic Life Expenditure in transmission system
Load basis can further realize the real load analysis to Wind turbines；Master can be also effectively analyzed based on loading analysis
The Fatigue Life Expenditure of the critical components such as axis, gear-box and analysis unit transmission chain service life etc..
Detailed description of the invention
Fig. 1 is the implementation process schematic diagram of the present embodiment Wind turbines slow-speed shaft torsional load monitoring method.
Fig. 2 is the Wind turbines drive model for the simplification established in the present embodiment.
Specific embodiment
Below in conjunction with Figure of description and specific preferred embodiment, the invention will be further described, but not therefore and
It limits the scope of the invention.
As shown in Figure 1, the present embodiment Wind turbines slow-speed shaft torsional load monitoring method, step include:
1) relational model between the torsional load of slow-speed shaft and the torque of generator is pre-established；
2) in real time obtain target running of wind generating set during generator given torque, and according to step 1) establish pass
It is the torsional load that model obtains target Wind turbines slow-speed shaft.
The present embodiment is based on Wind turbines and is driven realization principle, by establishing the torsional load of slow-speed shaft and turning for generator
Relational model between square gets the given of generator during running of wind generating set by the relational model established and in real time
Torque obtains the torsional load of Wind turbines slow-speed shaft, to realize inverse by transmission system high speed end generator torsional torque
To the driving torque for obtaining driving end, the torsional load for being not easy to the slow-speed shaft of measurement is obtained, implementation method is simple, without complexity
Operation does not need to add aided-detection device, the torsional load precision and efficiency of slow-speed shaft required at low cost and obtained yet
It is high.
In the present embodiment, the specific steps of the relational model between the torsional load of slow-speed shaft and the torque of generator are established
Are as follows: Wind turbines parameterize using multi-body dynamics modeling analysis method it is equivalent, foundation obtain Wind turbines transmission mould
Type；The kinetics equation of Wind turbines drive model is constructed, the kinetics equation based on building establishes the torsion of slow-speed shaft
Relational model between load and the torque of generator.By using be driven in wind turbine generator drive system realization principle and after
Continuous dynamics model analysis analysis method is verified, and can establish to obtain the model of high reliablity.
In the present embodiment, the establishment step of the relational model between the torsional load of slow-speed shaft and the torque of generator are as follows:
1.11) simplified Wind turbines drive model is established:
As shown in Fig. 2, the rotary inertia lump of blade, wheel hub and slow-speed shaft in wind turbine generator drive system is formed one
Equivalent mass block disk constitutes the first equivalent mass block disk, JtIt is formed by blade, wheel hub and slow-speed shaft rotary inertia lump
The first equivalent mass block equivalent moment of inertia, θtFor the absolute angular displacement of the first equivalent mass block；Gear-box rotation is used
Amount conversion forms an equivalent mass block disk to the high speed shaft end of output, constitutes the second equivalent mass block disk, J0For by tooth
The rotary inertia of the second equivalent mass block, θ are formed by when roller box conversion is to defeated high speed shaft end0For the exhausted of the second equivalent mass block
Diagonal displacement；And by high speed shaft rotary inertia and generator amature rotary inertia lump be an equivalent mass disk,
Constitute third equivalent mass block disk, JgFor on high speed shaft rotary inertia and generator amature rotary inertia lump be formed by
The equivalent moment of inertia of third equivalent mass block, θgFor the absolute angular displacement of third equivalent mass block；
1.12) construction force equation:
The Wind turbines drive model construction force equation that step 1.11) is established；
Since the kinetic energy of transmission system may be expressed as:
The potential energy of transmission system may be expressed as:
The energy consumption of transmission system may be expressed as:
Wherein, Klss、KhssThe respectively elastic torsion stiffness coefficient of slow-speed shaft, high speed shaft, Clss、ChssRespectively low speed
The axis damped coefficient of axis, high speed shaft, N=NηAnd NηFor the gear ratio of gear-box, ωtFor the angle speed of the first equivalent mass block disk
Degree, ω0For the angular speed of the second equivalent mass block disk, ωgFor the angular speed of third equivalent mass block disk.
The Lagrange's equation (Lagrange equation) for having N number of generalized coordinates system with complete ideal constraint
Are as follows:
Wherein Ek、Ed、EpKinetic energy, the potential energy of system and the energy consumption of system of respectively above-mentioned transmission system, i=t, 0, g,
qiIndicate generalized coordinates, FiIndicate the power of broad sense.
Then the generalized external force of the first equivalent mass block disk based on low speed end is the torsional load T at low speed endmIt is (i.e. pneumatic
Machine torque), the first equation is established by formula (5):
The second equivalent mass block disk to high speed shaft end, which is converted, based on gear-box there was only system internal force, without system external force,
Second equation is established by formula (6):
The generalized external force of third equivalent mass block disk based on high speed shaft end is electromagnetic torque-NpTe, wherein TgFor power generation
The torque of machine establishes third equation by formula (7):
Wherein, NpFor the number of pole-pairs of generator；
1.13) establish relational model between the torsional load of slow-speed shaft and the torque of generator:
It enablesTg=NpTe, and by step
Rapid the first equation, second equation and the third equation 1.12) established obtains the torque of the torsional load and generator of slow-speed shaft
Between relational model expression formula are as follows:
Due toFor mass matrix,For stiffness matrix,It, can be according to the Wind turbines machine system parameter of design phase for damping matrix
It obtains,It then can be according to wind turbine
The real-time running data of group obtains, thus after acquiring the given torque of generator, by the torsion for the slow-speed shaft that formula (8) are established
Reprint the torsional load that slow-speed shaft can be calculated in the relational model between lotus and the torque of generator.
In the present embodiment, step 1) further includes model verification step, specific steps afterwards, before step 2) are as follows: to slow-speed shaft
Relational model between torsional load and the torque of generator carries out mode solution, obtains the system frequency based on model；
The system frequency based on model is verified by the reference intrinsic frequency of system, if the verification passes, is then transferred to execution
Step 2).Mode is carried out by the relational model between the torsional load of above-mentioned slow-speed shaft and the torque of generator to foundation to ask
Solution, to verify the validity of model by natural mode of vibration, to be verified based on dynamics model analysis analysis method, Neng Goujian
It is vertical to obtain the model of high reliablity, so that it is guaranteed that obtained slow-speed shaft torsional load precision.
In the present embodiment, the specific steps of mode solution are as follows:
1.21) will take 0 on the right side of the relational model between the torsional load of slow-speed shaft and the torque of generator, and remove with
Mode frequency
The unrelated damping term of rate, is transformed to the 4th equation:
WhereinFor mass matrix,For stiffness matrix,
Q is angular displacement；
1.22) the 4th equation that step 1.21) transformation obtains can be deformed into the 5th equation:
Wherein ω is angular frequency,For angular speed；
System frequency based on model is obtained by the 5th equation solution
Mass matrix and stiffness matrix can be obtained according to the Wind turbines machine system parameter of design phase, passes through solution
Formula (10) can obtain system frequency, and the softwares such as matlab specifically can be used and solved.
In the present embodiment, the system frequency based on model is verified in model verification step specific steps
Are as follows: the system frequency based on model is compared with the reference intrinsic frequency of system, if the deviation of the two is in default model
It encloses in (the present embodiment specifically takes 5%), is then verified, is i.e. the obtained intrinsic frequency of above-mentioned relation model solution and with reference to intrinsic
Deviation between frequency is then verified less than 5%, it is believed that the relational model of above-mentioned foundation is effective.
The reference intrinsic frequency of system can specifically be acquired according to following two mode: one is using Bladed and
The softwares such as simpack obtain dynamic chain frequency f1As the reference intrinsic frequency of system, wind energy conversion system design process tractor parameter mould
Type can be obtained by softwares such as Bladed and simpack；Another kind is driven by the Model Distinguish in model machine stage
The modal frequency f of chain2Reference intrinsic frequency as system.
In the present embodiment, the specific steps of step 2) are as follows:
2.1) referred to by Condition Monitoring Data, operation during SCADA system acquisition running of wind generating set in Wind turbines
Data are enabled, the given torque T of generator is obtainedg, the revolving speed of revolving speed and slow-speed shaft, high speed shaft revolving speed；
2.2) data obtained according to step 2.1) calculate the torsional angular displacement and rotation acceleration, slow-speed shaft of generator
The torsional angular displacement and rotation acceleration of torsional angular displacement and torsion acceleration and high speed shaft obtain the first equivalent mass block circle
The absolute angular displacement of diskt, the second equivalent mass block disk absolute angular displacement0And third equivalent mass block disk is absolute
Angular displacementg；
2.3) relational model that data, the step 1) obtained according to step 2.2) is established obtains target Wind turbines slow-speed shaft
Torsional load.
SCADA (Supervisory Control And Data Acquisition, data during running of wind generating set
Acquisition and monitoring control) system can record unit dynamic response, then can obtain in real time generator by SCADA system and give
Torque Tg, slow-speed shaft revolving speed, high speed shaft revolving speed and generator speed, then slow-speed shaft torsion angle position is obtained by differential and integral
It movesWith torsion accelerationThe torsional angular displacement of high speed shaftWith torsion accelerationGenerator torsional angular displacementWith turn
Dynamic accelerationIt substitutes into the relational model of above-mentioned formula (8) and slow-speed shaft torsional load can be obtained.
The present embodiment obtains low speed based on Wind turbines self-operating data directly based on the data of SCADA system
The real-time of slow-speed shaft torsional load value can be realized without increasing load measuring cell or other equipment in axis torsional load value
On-line monitoring, the dependence needed for capable of utmostly reducing in slow-speed shaft torsional load monitoring process to hardware condition, to mention
Supply unit is monitored, the Gernral Check-up of chain sub-assembly etc. analysis.
The present embodiment passes through the torsional load of real-time monitoring slow-speed shaft, is conducive to pass in running of wind generating set use process
The critical component of dynamic system, such as main shaft, gear-box, the practical dynamic loading analysis of gear case elastic support carry out, and be these portions
Part fatigue loss analysis provides load source and provides operation carrying data basis for set drive chain durability analysis.
The present embodiment further comprises load of wind turbine generator analysis method, and step includes:
According to slow-speed shaft torsional load in above-mentioned monitoring method monitoring objective Wind turbines；
Loading analysis is carried out to target Wind turbines based on the slow-speed shaft torsional load monitored.
The present embodiment is based on above-mentioned monitoring mode and carries out Wind turbines real-time monitoring to slow-speed shaft torsional load, and monitoring obtains
Real-time slow-speed shaft torsional load value, be the carrying of the critical components such as main shaft, gear-box, resilient support and service life in transmission system
Loss analysis provides load basis, to further realize the real load analysis to Wind turbines；Can be had based on loading analysis
The Fatigue Life Expenditure of the critical components such as effect analysis main shaft, gear-box and analysis unit transmission chain service life.
Above-mentioned only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form.Although of the invention
It has been disclosed in a preferred embodiment above, however, it is not intended to limit the invention.Therefore, all without departing from technical solution of the present invention
Content, technical spirit any simple modifications, equivalents, and modifications made to the above embodiment, should all fall according to the present invention
In the range of technical solution of the present invention protection.
Claims (8)
1. a kind of Wind turbines slow-speed shaft torsional load monitoring method, which is characterized in that step includes:
1) relational model between the torsional load of slow-speed shaft and the torque of generator is pre-established；
2) in real time obtain target running of wind generating set during generator given torque, and according to the step 1) establish pass
It is the torsional load that model obtains target Wind turbines slow-speed shaft；
The specific steps of relational model between the torsional load for establishing slow-speed shaft and the torque of generator are as follows: use more bodies
Dynamic Modeling analysis method the transmission chain system of Wind turbines parameterize it is equivalent, foundation obtain Wind turbines transmission mould
Type；The kinetics equation for constructing the Wind turbines drive model, the kinetics equation based on building establish slow-speed shaft
Relational model between torsional load and the torque of generator.
2. Wind turbines slow-speed shaft torsional load monitoring method according to claim 1, it is characterised in that: the slow-speed shaft
Torsional load and generator torque between relational model expression formula are as follows:
Wherein, JtThe Equivalent Rotational for being formed by the first equivalent mass block for blade, wheel hub and slow-speed shaft rotary inertia lump is used
Amount, θtFor the absolute angular displacement of the first equivalent mass block, J0The is formed by when for by gear-box conversion to defeated high speed shaft end
The rotary inertia of two equivalent mass blocks, θ0For the absolute angular displacement of the second equivalent mass block, JgIt is used for the rotation on high speed shaft
Amount and the lump of generator amature rotary inertia are formed by the equivalent moment of inertia of third equivalent mass block, θgFor described third etc.
Imitate the absolute angular displacement of mass block, Klss、KhssThe respectively elastic torsion stiffness coefficient of slow-speed shaft, high speed shaft, Clss、ChssRespectively
For slow-speed shaft, the axis damped coefficient of high speed shaft, N=NηAnd NηFor the gear ratio of gear-box, TgFor the given torque of generator, Tm
For the torsional load of slow-speed shaft；
AndωtFor the described first equivalent matter
The angular speed of gauge block disk, ω0For the angular speed of the second equivalent mass block disk, ωgFor third equivalent mass block circle
The angular speed of disk.
3. Wind turbines slow-speed shaft torsional load monitoring method according to claim 2, it is characterised in that: the slow-speed shaft
Torsional load and generator torque between relational model establishment step are as follows:
1.11) simplified Wind turbines drive model is established: by turn of blade, wheel hub and slow-speed shaft in wind turbine generator drive system
Dynamic inertia lump forms an equivalent mass block disk, constitutes the first equivalent mass block disk；By gear-box rotary inertia
The high speed shaft end for converting output forms an equivalent mass block disk, constitutes the second equivalent mass block disk；And it will
Rotary inertia and generator amature rotary inertia lump on high speed shaft are an equivalent mass disk, constitute the third equivalent
Mass block disk；
1.12) construction force equation: the Wind turbines drive model construction force equation that the step 1.11) is established；
Generalized external force based on the first equivalent mass block disk is the torsional load T at low speed endmEstablish the first equation:
There was only system internal force based on the second equivalent mass block disk, establish second equation without system external force:
Generalized external force based on the third equivalent mass block disk is electromagnetic torque-NpTeEstablish third equation:
Wherein, NpFor the number of pole-pairs of generator；
1.13) relational model between the torsional load of slow-speed shaft and the torque of generator is established:
It enablesTg=NpTe, and by the step
1.12) the first equation, second equation and the third equation established obtain the torsional load of the slow-speed shaft and turning for generator
Relational model between square.
4. Wind turbines slow-speed shaft torsional load monitoring method according to claim 3, which is characterized in that the step 1)
It afterwards, further include model verification step, specific steps before step 2) are as follows: the torque of torsional load and generator to the slow-speed shaft
Between relational model carry out mode solution, obtain the system frequency based on model；By the reference intrinsic frequency pair of system
The system frequency based on model is verified, and if the verification passes, is then transferred to and is executed step 2).
5. Wind turbines slow-speed shaft torsional load monitoring method according to claim 4, which is characterized in that the mode is asked
The specific steps of solution are as follows:
1.21) relational model between the torsional load of the slow-speed shaft and the torque of generator is transformed to the 4th equation:
WhereinFor mass matrix,For stiffness matrix, q is
Angular displacement,For acceleration；
1.22) the 4th equation that the step 1.21) transformation obtains is deformed into the 5th equation:
Wherein ω is angular frequency,For angular speed；
System frequency f based on model is obtained by the 5th equation solution.
6. Wind turbines slow-speed shaft torsional load monitoring method according to claim 5, it is characterised in that: the model is tested
The specific steps that the system frequency based on model is verified in card step are as follows: by the system based on model
Intrinsic frequency is compared with the reference intrinsic frequency of system, if the deviation of the two is within a preset range, is verified.
7. Wind turbines slow-speed shaft torsional load monitoring method, feature according to any one of claim 3~6 exist
In: the specific steps of the step 2) are as follows:
2.1) pass through Condition Monitoring Data, operating instruction number during SCADA system acquisition running of wind generating set in Wind turbines
According to obtaining the given torque T of generatorg, the revolving speed of revolving speed and slow-speed shaft, high speed shaft revolving speed；
2.2) data obtained according to the step 2.1) calculate the torsional angular displacement and rotation acceleration, slow-speed shaft of generator
The torsional angular displacement and rotation acceleration of torsional angular displacement and torsion acceleration and high speed shaft, obtain first equivalent mass
The absolute angular displacement of block diskt, the second equivalent mass block disk absolute angular displacement0And the third equivalent quality
The absolute angular displacement of block diskg；
2.3) it is low that the relational model that data, the step 1) obtained according to the step 2.2) is established obtains target Wind turbines
The torsional load of fast axis.
8. a kind of load of wind turbine generator analysis method, which is characterized in that step includes:
According to slow-speed shaft torsional load in monitoring method monitoring objective Wind turbines described in any one of claim 1~7；
Loading analysis is carried out to transmission system in target Wind turbines based on the slow-speed shaft torsional load monitored.
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| CN110080943B (en) * | 2019-04-28 | 2020-09-29 | 石河子大学 | Double-fed motor transmission chain torsional vibration active control method |
| CN111120223B (en) * | 2019-12-16 | 2021-09-03 | 大连赛听科技有限公司 | Blade fault monitoring method and device based on double arrays |
| CN111859649B (en) * | 2020-07-10 | 2023-10-03 | 中国科学院电工研究所 | Wind turbine generator transmission chain ground test working condition establishment method based on virtual simulation |
| CN111859650B (en) * | 2020-07-10 | 2023-10-20 | 中国科学院电工研究所 | Wind turbine generator set transmission chain virtual ground test method based on online joint simulation |
| CN113623146B (en) * | 2021-09-15 | 2023-06-30 | 中国船舶重工集团海装风电股份有限公司 | On-line monitoring method for fatigue state of gearbox of wind generating set |
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