CN-122014524-A - Wind power variable pitch bearing friction torque evaluation and early warning method and device

CN122014524ACN 122014524 ACN122014524 ACN 122014524ACN-122014524-A

Abstract

The invention discloses a wind power variable pitch bearing friction torque assessment and early warning method and device, relates to the technical field of wind power generation, and aims to solve the problem of inaccurate assessment caused by the fact that the prior art relies on an empirical formula; the method comprises the steps of collecting current of a variable pitch drive motor in real time, calculating output torque according to the current, obtaining current wind speed and turbulence intensity, inquiring a preset database to obtain corresponding torque of the root of a blade, converting the output torque of the motor into total torque acting on a variable pitch bearing by combining transmission parameters of a variable pitch system, accurately obtaining real-time friction torque of the variable pitch bearing by calculating the difference value of the total torque and the torque of the root of the blade, comparing the friction torque with a preset basic value, and realizing fault early warning according to the degree exceeding a threshold value.

Inventors

YIN JINGXUN
LUO JING
YANG XIN
Dong Zengcai
LIANG XIANG
YI HUI
LI JIE
YANG LEI
SHENG XINLEI
YANG HAONAN
ZENG QINGZHONG
LI BO
GAO ZHONGHUA
WANG JUN

Assignees

东方电气风电股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260204

Claims (10)

1. The wind power variable pitch bearing friction torque evaluation and early warning method is characterized by comprising the following steps of: Collecting operation parameters of a motor in a variable pitch system in real time; calculating the output torque of the variable pitch drive motor based on the operation parameters; Acquiring the torque of the root of the blade under the current wind condition; calculating the total moment acting on the pitch bearing based on the output moment and the transmission parameters of the pitch system; Calculating a pitch bearing friction torque based on the difference between the total torque and the blade root torque; And comparing the friction moment with a preset basic value, and carrying out fault early warning according to a comparison result.
2. The wind power pitch bearing friction torque evaluation early warning method according to claim 1 is characterized in that the real-time acquisition of the operation parameters of the motor in the pitch system comprises the steps of acquiring the current of a pitch drive motor, and calculating the output torque of the pitch drive motor based on the operation parameters, wherein k is a preset proportionality coefficient through a formula of T motor=ki.
3. The wind power variable pitch bearing friction torque evaluation and early warning method according to claim 1, wherein the obtaining the blade root torque under the current wind condition comprises: Acquiring current wind speed and turbulence intensity data; And inquiring a pre-established blade root torque database, and obtaining corresponding blade root torque according to the current wind speed and turbulence intensity data, wherein the database is established by calculating the blade root torque under different wind speeds and turbulence intensities based on a wind turbine generator system simulation model.
4. The wind power pitch bearing friction torque evaluation early warning method according to claim 1, wherein the total torque acting on the pitch bearing is calculated based on the output torque and the pitch system transmission parameter, and the expression is T bearing=i T-shaped motor Η, wherein i is the transmission ratio of the pitch system and η is the transmission efficiency.
5. The wind power variable pitch bearing friction torque evaluation and early warning method according to claim 1, wherein the variable pitch bearing friction torque is calculated based on the difference between the total torque and the torque of the root of the blade, and the expression is tsurface = tshaft-tshape.
6. The wind power pitch bearing friction torque evaluation and early warning method according to claim 1, further comprising a data smoothing step, before or after the calculation of the pitch bearing friction torque, of processing the output torque of the pitch drive motor, the blade root torque and/or the pitch bearing friction torque with an average value within a predetermined time window.
7. The wind power variable pitch bearing friction torque evaluation and early warning method according to claim 6, wherein the predetermined time window is 10 minutes.
8. The wind power variable pitch bearing friction torque evaluation and early warning method according to claim 1, wherein the performing fault early warning according to the comparison result comprises: when the friction torque of the variable-pitch bearing exceeds a first set duty ratio of the basic value under the same wind condition, triggering mild fault early warning; and triggering fault warning when the friction torque of the variable-pitch bearing exceeds a second set duty ratio of the basic value, wherein the second set duty ratio is larger than the first set duty ratio.
9. The wind power variable pitch bearing friction torque evaluation and early warning method according to claim 1, further comprising a system calibration step, comprising: executing the pitch action in the windless or breeze state, and collecting the calculated friction moment of the pitch bearing as a calibration value; and when the friction torque is calculated in the normal running state, introducing the calibration value to correct the calculation result.
10. Wind-powered electricity generation becomes oar bearing friction moment aassessment early warning device, its characterized in that, the device includes: the acquisition module is used for acquiring the operation parameters of the motor in the variable pitch system in real time; The first calculation module is used for calculating the output torque of the variable pitch drive motor based on the operation parameters; the acquisition module is used for acquiring the torque of the root of the blade under the current wind condition; The second calculation module is used for calculating the total moment acting on the pitch bearing based on the output moment and the transmission parameters of the pitch system; The third calculation module is used for calculating the friction torque of the variable-pitch bearing based on the difference value of the total torque and the torque of the root of the blade; and the evaluation early warning module is used for comparing the friction moment with a preset basic value and carrying out fault early warning according to a comparison result.

Description

Wind power variable pitch bearing friction torque evaluation and early warning method and device Technical Field The invention relates to the technical field of wind power generation, in particular to a wind power variable pitch bearing friction torque evaluation and early warning method and device. Background The wind power pitch system is one of core components of the wind turbine, and adjusts the power captured by the wind wheel by changing the pitch angle of blades, so that the stable output power of the wind turbine above the rated wind speed is ensured. The variable pitch bearing is used as a key component for connecting the blade and the hub, and the running state of the variable pitch bearing is directly related to the safety and the service life of the whole machine. The friction torque of a pitch bearing is an important indicator for assessing its health. Abnormal increase of friction moment is often related to faults such as bearing lubrication failure, raceway damage, abnormal bolt pretightening force and the like. Currently, the estimation of the friction torque of a pitch bearing in the industry often depends on an empirical formula for calculation. These empirical formulas are typically based on ideal operating conditions and conservative assumptions, which fail to adequately account for the complex actual operating conditions of the pitch bearing. The friction moment of the pitch bearing is related to various factors such as bearing type, external load, lubrication condition and the like, wherein the external load dynamically changes along with wind condition parameters such as wind speed, turbulence intensity and the like, so that a calculation result based on an empirical formula has larger deviation from an actual value. Therefore, uncertainty in the prior art makes it difficult to accurately judge the true friction level of the bearing, and not only can the design redundancy of the driving torque of the pitch system be caused by overestimation, but also serious faults can be caused by failure in timely identifying the increase of friction resistance. Disclosure of Invention In view of the above problems, the invention provides a wind power pitch bearing friction moment assessment and early warning method and device, which can be used for assessing the friction moment of a pitch bearing on line in real time, dynamically and accurately, effectively reflecting the real friction level of the pitch bearing, realizing reliable fault early warning based on the real friction level, and providing data support for predictive maintenance of a wind turbine generator. In a first aspect, an embodiment of the present invention provides a wind power pitch bearing friction torque evaluation and early warning method, where the wind power pitch bearing friction torque evaluation and early warning method includes: Collecting operation parameters of a motor in a variable pitch system in real time; calculating the output torque of the variable pitch drive motor based on the operation parameters; Acquiring the torque of the root of the blade under the current wind condition; calculating the total moment acting on the pitch bearing based on the output moment and the transmission parameters of the pitch system; Calculating a pitch bearing friction torque based on the difference between the total torque and the blade root torque; And comparing the friction moment with a preset basic value, and carrying out fault early warning according to a comparison result. In some embodiments, the real-time acquisition of the operation parameters of the motor in the pitch system comprises acquisition of the current of the pitch drive motor, and calculation of the output torque of the pitch drive motor based on the operation parameters is achieved through calculation of a formula T motor=ki, wherein k is a preset proportionality coefficient. In some embodiments, the obtaining blade root torque at the current wind condition includes: Acquiring current wind speed and turbulence intensity data; And inquiring a pre-established blade root torque database, and obtaining corresponding blade root torque according to the current wind speed and turbulence intensity data, wherein the database is established by calculating the blade root torque under different wind speeds and turbulence intensities based on a wind turbine generator system simulation model. In some embodiments, the total moment acting on the pitch bearing is calculated based on the output moment and the pitch system transmission parameters, expressed as T bearing = iT-shaped motorΗ, wherein i is the transmission ratio of the pitch system and η is the transmission efficiency. In some embodiments, the pitch bearing friction torque is calculated based on the difference between the total torque and the blade root torque, expressed as Tfriction = Tbearing-Troot. In some embodiments, before or after the calculation of the pitch bearing friction torque, a data smoothing step is fu