CN111985110A - Wind turbine generator yaw bearing service life calculation method and device - Google Patents
Wind turbine generator yaw bearing service life calculation method and device Download PDFInfo
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- CN111985110A CN111985110A CN202010859379.7A CN202010859379A CN111985110A CN 111985110 A CN111985110 A CN 111985110A CN 202010859379 A CN202010859379 A CN 202010859379A CN 111985110 A CN111985110 A CN 111985110A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F2113/00—Details relating to the application field
- G06F2113/06—Wind turbines or wind farms
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F2119/04—Ageing analysis or optimisation against ageing
Abstract
The invention provides a method and a device for calculating the service life of a yaw bearing of a wind turbine generator. The method comprises the following steps: converting the input time sequence load into bearing load working conditions under each single working condition; calculating the service life of the bearing under each single working condition according to the design parameters of the bearing; calculating a bearing damage value under a single working condition according to the bearing rotating speed, the bearing rotating speed and the bearing service life under each single working condition; and accumulating the damage amount under each single working condition according to the damage accumulation theory of Miner criterion to obtain the damage amount of the bearing in the design life of the whole wind turbine generator. The method and the device for calculating the service life of the yaw bearing of the wind turbine generator set are high in accuracy and good in reliability, and can provide accurate guidance for fatigue calculation of the yaw bearing of the wind turbine generator set.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a method and a device for calculating the service life of a yaw bearing of a wind turbine generator.
Background
The method for calculating the service life of the yaw bearing of the wind generating set is always a blind area in the wind power industry, and no unified requirement is provided for fatigue calculation of the yaw bearing of the wind generating set in each large certification standard.
Fatigue calculations according to ISO 281 and ISO 16281 require the use of equivalent loads for the bearings, the result being the number of revolutions or hours of life of the bearings, provided that the bearings maintain circular motion, but the yaw bearings are designed to operate in a manner that swings according to the wind direction. DG 03 (according to NREL (national renewable energy laboratory) DG 03: Yaw and Pitch Rolling Bearing Life) provides a method for calculating the service Life of a swing Bearing, but the method requires fixed swing angle amplitude and swing speed parameters, in fact, the swing amplitude and swing direction of the Yaw Bearing change at any time when the Yaw Bearing performs a Yaw action, and a stable swing angle amplitude and swing speed parameter cannot be provided, so the method for calculating the service Life of the Bearing in DG 03 is not good for the applicability of the Yaw Bearing of the wind generating set.
Disclosure of Invention
The invention aims to provide a method and a device for calculating the service life of a yaw bearing of a wind turbine generator system, and provides accurate guidance for fatigue calculation of the yaw bearing of the wind turbine generator system.
In order to solve the technical problem, the invention provides a method for calculating the service life of a yaw bearing of a wind turbine generator, which comprises the following steps: converting the input time sequence load into bearing load working conditions under each single working condition; calculating the service life of the bearing under each single working condition according to the design parameters of the bearing; calculating a bearing damage value under a single working condition according to the bearing rotating speed, the bearing rotating speed and the bearing service life under each single working condition; and accumulating the damage amount under each single working condition according to the damage accumulation theory of Miner criterion to obtain the damage amount of the bearing in the design life of the whole wind turbine generator.
In some embodiments, further comprising: after the damage amount of the bearing in the design life period of the whole wind turbine generator is obtained by accumulating the damage amount under each single working condition according to the damage accumulation theory of Miner criterion, the total damage amount is compared with 1 to evaluate whether the life of the bearing meets the design requirement.
In some embodiments, converting the input time series load into bearing load conditions at each single condition comprises: inputting the time sequence load of the bearing; the bearing load is calculated from the input load.
In some embodiments, inputting a time series load of a bearing comprises: and inputting the load under each single working condition, the bearing rotating speed under each single working condition, the acquisition time step length of each single working condition and the occurrence frequency of the working condition in the whole design life of the wind turbine generator.
In some embodiments, calculating the bearing load from the input load comprises: and under each single working condition, calculating the axial load, the radial load, the overturning moment and the equivalent load of the bearing.
In some embodiments, calculating the axial load of the bearing at each single operating condition comprises: the axial load is calculated according to the following formula:
Fai＝Fz
wherein, FaiAxial load of the bearing in the i-th operating mode, FzThe Z-axis load is shown for the i-th condition.
In some embodiments, calculating the radial load of the bearing at each single operating condition comprises: the radial load is calculated according to the following formula:
wherein, FriAxial load of the bearing in the i-th operating mode, FxRepresenting the X-axis load, F, in the i-th operating conditionyIndicating the Y-axis load for the i-th condition.
In some embodiments, calculating the overturning moment of the bearing at each single operating condition comprises: the overturning moment is calculated according to the following formula:
wherein M isiRepresenting the overturning moment, M, of the bearing under the i-th operating conditionxRepresenting the moment of the X-axis, M, in the i-th operating conditionyIndicating the Y-axis torque for the i-th operating condition.
In some embodiments, calculating the equivalent load of the bearing at each single operating condition comprises: the equivalent load is calculated according to the following formula:
Peai＝0.75×Fri+Fai+2Mi/dm
wherein, the equivalent load of the bearing under the i-th working condition is represented as FriAxial load of the bearing in the i-th operating mode, FaiRepresenting the axial load, M, of the bearing in the i-th conditioniThe overturning moment of the bearing in the i-th working condition is shown, and dm is the roller rotating diameter of the bearing.
In addition, the invention also provides a wind turbine generator yaw bearing service life calculating device, which comprises: one or more processors; a storage device for storing one or more programs, which when executed by the one or more processors, cause the one or more processors to implement the wind turbine generator yaw bearing life calculation method according to the foregoing.
After adopting such design, the invention has at least the following advantages:
according to the principle that the actual movement mode of the bearing under each single working condition is rotation in a single direction, the service life and the damage amount of the bearing under the working condition are calculated according to the L-P theory, and the reliability is high. And accumulating the damage amount of the bearing under each single working condition according to Miner criterion to obtain the total damage amount of the bearing, and taking whether the total damage amount reaches 1 as a judgment standard of the service life of the bearing, wherein sufficient theoretical basis exists. The method is high in calculation mode accuracy and good in reliability, and can provide accurate guidance for fatigue calculation of the yaw bearing of the wind generating set.
Drawings
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 flowchart of a method for calculating a lifetime of a yaw bearing of a wind turbine generator according to an embodiment of the present invention;
fig. 2 is a structural diagram of a device for calculating the service life of a yaw bearing of a wind turbine generator according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In order to better evaluate the service life of the yaw bearing of the wind generating set, the invention provides a method for calculating the service life of the yaw bearing based on time sequence load. The time sequence load is obtained by listing all calculated load working conditions when a manufacturer of the complete wind turbine generator evaluates the grade of a wind field, and the accuracy of the time sequence load is higher than the equivalent load used for fatigue calculation according to ISO 281 and ISO 16281. Meanwhile, the actual movement mode of the bearing under each single working condition is rotation in a single direction, and the service life and the damage amount of the bearing under the working condition are calculated according to an L-P theory, so that the reliability is high. And accumulating the damage amount of the bearing under each single working condition according to Miner criterion to obtain the total damage amount of the bearing, and taking whether the total damage amount reaches 1 as a judgment standard of the service life of the bearing, wherein sufficient theoretical basis exists. The method is high in calculation mode accuracy and good in reliability, and can provide accurate guidance for fatigue calculation of the yaw bearing of the wind generating set.
The time sequence load of a yaw bearing coordinate system is used as input, and the bearing service life L of the bearing under each single working condition i in the time sequence load is calculated by combining the design parameters of the bearingi(ii) a The occurrence frequency T of each single working condition in the design life of the wind turbine generator is countediThe total motion stroke N of the bearing under each single working condition can be obtainediHerein, thisTotal stroke NiLife L of bearingiCombining, the bearing damage D under each single working condition can be calculatedi. According to the damage accumulation theory of Miner criterion, accumulating the damage D of each single working conditioniNamely the damage D of the bearing in the design life of the whole wind turbine. Comparing the total damage D with 1 can evaluate whether the service life of the bearing meets the design requirement.
The following process is implemented by programming.
1. Reading time sequence load of bearing
The coordinate system of the time sequence load is the yaw bearing coordinate system, as shown in fig. 1. The time sequence load comprises a load F under each single working condition i in three directionsxi、Fyi、Fzi、Mxi、Myi、MziSpeed n of rotation of the bearing per single operating conditioniAcquisition time step t for each single operating modeiAnd the occurrence frequency T of the working condition in the whole design life of the wind turbine generatori。
2. Calculating bearing load from input load
For each single operating condition, the axial load of the bearing is:
Fai＝Fz
radial load:
overturning moment:
equivalent load of bearing:
Peai＝0.75×Fri+Fai+2Mi/dm
wherein d ismIs the roller revolution diameter of the bearing.
3. Design parameters of bearing
The design parameters of the bearing are used for calculating the rated dynamic load of the bearing:
Ca＝3.647fcm(i·cosα)0.7Z2/3D1.4tanα
wherein: ca-bearing load rating; f. ofcm-bearing geometry, material, manufacturing accuracy related calculation coefficients; i-number of rows of rolling elements; z is the number of single-row rolling bodies; d is the diameter of the rolling body; alpha-rolling element contact angle.
4. Calculation of bearing damage under single operating condition
According to the bearing service life calculation method of the L-P theory, the service life of the bearing under a single working condition is as follows:
Li＝(Ca/Peai)3×106rotating shaft
Under a single working condition, the running stroke of the bearing is as follows:
Ni＝ni×ti×Ti
the damage amount of the bearing under the working condition is as follows:
Di＝Ni/Li
5. judging whether the service life of the bearing in the whole service life period meets the use requirement
Damage amount of bearing in life:
D＝∑Di
and if D is less than 1, judging that the bearing meets the service life requirement.
When the flow is used, the program judges whether the fatigue life of the bearing meets the use requirement or not according to the following logic sequence.
FIG. 2 shows a structure of a wind turbine yaw bearing life calculation device. Referring to FIG. 2, for example, the wind turbine yaw bearing life calculation apparatus 200 may be used to act as a yaw bearing life prediction host in a wind turbine system. As described herein, the wind turbine yaw bearing life calculation apparatus 200 may be used to implement a bearing life calculation function in a wind turbine system. The wind turbine yaw bearing life calculation apparatus 200 may be implemented in a single node, or the functions of the wind turbine yaw bearing life calculation apparatus 200 may be implemented in multiple nodes in a network. Those skilled in the art will appreciate that the term wind turbine yaw bearing life calculation device includes a broad sense of apparatus, and that the wind turbine yaw bearing life calculation device 200 shown in FIG. 2 is only one example. The wind turbine yaw bearing life calculation apparatus 200 is included for clarity and is not intended to limit the application of the present invention to a particular wind turbine yaw bearing life calculation apparatus embodiment or to a certain class of wind turbine yaw bearing life calculation apparatus embodiments. At least some of the features/methods described herein may be implemented in a network device or component, such as the wind turbine yaw bearing life calculation device 200. For example, the features/methods of the present invention may be implemented in hardware, firmware, and/or software running installed on hardware. The wind turbine yaw bearing life calculation apparatus 200 may be any device that processes, stores, and/or forwards data frames via a network, such as a server, a client, a data source, and the like. As shown in FIG. 2, the wind turbine yaw bearing life calculation device 200 may include a transceiver (Tx/Rx)210, which may be a transmitter, a receiver, or a combination thereof. Tx/Rx 210 may be coupled to a plurality of ports 250 (e.g., an uplink interface and/or a downlink interface) for transmitting and/or receiving frames from other nodes. Processor 230 may be coupled to Tx/Rx 210 to process frames and/or determine to which nodes to send frames. Processor 230 may include one or more multi-core processors and/or memory devices 232, which may serve as data stores, buffers, and the like. Processor 230 may be implemented as a general-purpose processor or may be part of one or more Application Specific Integrated Circuits (ASICs) and/or Digital Signal Processors (DSPs).
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 (10)
1. A method for calculating the service life of a yaw bearing of a wind turbine generator is characterized by comprising the following steps:
converting the input time sequence load into bearing load working conditions under each single working condition;
calculating the service life of the bearing under each single working condition according to the design parameters of the bearing;
calculating a bearing damage value under a single working condition according to the bearing rotating speed, the bearing rotating speed and the bearing service life under each single working condition;
and accumulating the damage amount under each single working condition according to the damage accumulation theory of Miner criterion to obtain the damage amount of the bearing in the design life of the whole wind turbine generator.
2. The wind turbine generator yaw bearing life calculation method according to claim 1, further comprising:
after the damage amount of the bearing in the design life period of the whole wind turbine generator is obtained by accumulating the damage amount under each single working condition according to the damage accumulation theory of Miner criterion, the total damage amount is compared with 1 to evaluate whether the life of the bearing meets the design requirement.
3. The wind turbine generator yaw bearing life calculation method according to claim 1 or 2, wherein converting the input time sequence load into bearing load conditions under each single condition comprises:
inputting the time sequence load of the bearing;
the bearing load is calculated from the input load.
4. The method for calculating the service life of the yaw bearing of the wind turbine generator according to claim 3, wherein inputting the time sequence load of the bearing comprises:
and inputting the load under each single working condition, the bearing rotating speed under each single working condition, the acquisition time step length of each single working condition and the occurrence frequency of the working condition in the whole design life of the wind turbine generator.
5. The wind turbine generator yaw bearing life calculation method of claim 3, wherein calculating a bearing load from an input load comprises:
and under each single working condition, calculating the axial load, the radial load, the overturning moment and the equivalent load of the bearing.
6. The method for calculating the service life of the yaw bearing of the wind turbine generator according to claim 5, wherein calculating the axial load of the bearing under each single working condition comprises:
the axial load is calculated according to the following formula:
Fai＝Fz
wherein, FaiAxial load of the bearing in the i-th operating mode, FzThe Z-axis load is shown for the i-th condition.
7. The method for calculating the service life of the yaw bearing of the wind turbine generator according to claim 5, wherein calculating the radial load of the bearing under each single working condition comprises:
the radial load is calculated according to the following formula:
wherein, FriAxial load of the bearing in the i-th operating mode, FxRepresenting the X-axis load, F, in the i-th operating conditionyIndicating the Y-axis load for the i-th condition.
8. The method for calculating the service life of the yaw bearing of the wind turbine generator according to claim 5, wherein calculating the overturning moment of the bearing under each single working condition comprises:
the overturning moment is calculated according to the following formula:
wherein M isiRepresenting the overturning moment, M, of the bearing under the i-th operating conditionxRepresenting the moment of the X-axis, M, in the i-th operating conditionyIndicating the Y-axis torque for the i-th operating condition.
9. The method for calculating the service life of the yaw bearing of the wind turbine generator according to claim 5, wherein calculating the equivalent load of the bearing under each single working condition comprises:
the equivalent load is calculated according to the following formula:
Peai＝0.75×Fri+Fai+2Mi/dm
wherein, the equivalent load of the bearing under the i-th working condition is represented as FriAxial load of the bearing in the i-th operating mode, FaiRepresenting the axial load, M, of the bearing in the i-th conditioniThe overturning moment of the bearing in the i-th working condition is shown, and dm is the roller rotating diameter of the bearing.
10. The utility model provides a wind turbine generator system driftage bearing life-span accounting device which characterized in that includes:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the wind turbine yaw bearing life calculation method of any of claims 1-9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114021288A (en) * | 2021-11-19 | 2022-02-08 | 西安热工研究院有限公司 | Method for predicting service life of yaw bearing of wind turbine generator |
| CN114444336A (en) * | 2022-04-08 | 2022-05-06 | 杭州安脉盛智能技术有限公司 | New energy automobile motor service life estimation method and system based on information fusion |
| CN115983054A (en) * | 2023-03-21 | 2023-04-18 | 中车山东风电有限公司 | Capability evaluation and load processing method of wind generating set and terminal |
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| US20110115233A1 (en) * | 2008-02-18 | 2011-05-19 | Schroeppel Werner | Wind power plant and method for operating the same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114021288A (en) * | 2021-11-19 | 2022-02-08 | 西安热工研究院有限公司 | Method for predicting service life of yaw bearing of wind turbine generator |
| CN114021288B (en) * | 2021-11-19 | 2024-02-20 | 西安热工研究院有限公司 | Method for predicting service life of yaw bearing of wind turbine generator |
| CN114444336A (en) * | 2022-04-08 | 2022-05-06 | 杭州安脉盛智能技术有限公司 | New energy automobile motor service life estimation method and system based on information fusion |
| CN115983054A (en) * | 2023-03-21 | 2023-04-18 | 中车山东风电有限公司 | Capability evaluation and load processing method of wind generating set and terminal |
| CN115983054B (en) * | 2023-03-21 | 2023-08-11 | 中车山东风电有限公司 | Capability assessment and load processing method for wind generating set and terminal |
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