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风电机组齿轮箱是容易发生故障的重要部件,维修费用高昂,因此有必要对其进行实时状态监测。针对集成K近邻(KNN)算法对随机采样不敏感的问题,提出了一种基于规则采样的改进集成KNN模型。首先利用距离相关系数进行变量选择,然后基于正则化互信息对变量进行排序,将其用于规则采样,构造子训练集,最后基于统计过程控制方法设置预警阈值对实时残差进行分析,根据健康度曲线对风电机组齿轮箱健康度进行监测,并利用某风电机组实际数据对所提方法进行验证。结果表明:所提方法显著提升了模型估计精度,该模型优于常规集成KNN模型,可以实现齿轮箱的早期故障预警。 相似文献
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针对风电机组故障频发且早期故障监测难的问题,为实现风电机组智能监测,提出基于卷积自编码(CAE)与双向长短期神经网络(BiLSTM)的风电机组齿轮箱故障预警方法。首先对风电场数据采集与监视控制(SCADA)系统的数据进行预处理,选择能表征风电机组齿轮箱运行状态的监测量作为输出量,根据相关性分析选择与输出量相关性高的监测量作为输入参数;然后根据特征选择特性和参数非线性特性构建深度学习网络模型,对输出的预测值和残差进行统计分析,设置自适应阈值来监测风电机组异常状态的趋势变化。将CAE-BiLSTM模型应用于某风电场的算例分析中,并与其他模型的预测效果进行对比。结果表明:该方法解决了模型输入与结构冗余问题,提高了模型精度,能够有效预警风电机组齿轮箱早期故障。 相似文献
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李雄威郭晓雅李庚达崔青汝伍权 《可再生能源》2022,(10):1346-1351
风电机组状态监测是提升机组运行水平和经济效益的重要手段。文章提出了一种基于非线性偏最小二乘(PLS)的风电机组齿轮箱状态监测方法,利用数据采集与监控系统(SCADA)数据对齿轮箱油温进行建模和监测。首先,基于无监督聚类对SCADA数据进行预处理,利用相关性分析选取与齿轮箱油温相关的输入变量;然后,构建用于表征非线性关系的输入变量,建立正常运行工况下齿轮箱油温的非线性PLS模型;最后,根据模型输出结果与齿轮箱油温的残差分布,设置合理阈值,用于齿轮箱状态监测。应用该模型对某大型风电机组齿轮箱进行状态监测。监测结果表明,相比于BP神经网络模型,该模型具有更高的拟合优度和预测精度。 相似文献
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针对风电机组轴承微弱故障信号的特征提取困难和故障诊断模型性能差等问题,提出一种并行卷积神经网络的故障诊断方法。首先,利用连续小波变换将一维信号转换成二维时频特性图;其次,构造一种并行卷积神经网络结构,该结构由大卷积层和并行卷积层组成,大卷积层快速提取输入层所有特征,并行卷积层识别特征中的有效故障信息,且并行卷积层为双层小卷积并行结构;然后,采用特征融合层,融合并行卷积层2次特征提取后的故障特征,实现诊断模型内部的特征增强,降低模型复杂度;最后,经实验验证,该模型诊断轴承故障的准确率为98.25%。 相似文献
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基于粒子群优化BP神经网络的风电机组齿轮箱故障诊断方法 总被引:3,自引:0,他引:3
提出了一种基于粒子群优化BP神经网络风电机组齿轮箱故障诊断方法。粒子群算法不需要计算梯度,可以兼顾全局寻优和局部寻优。利用粒子群算法对BP网络权值和偏置进行优化,减少了BP神经网络算法陷入局部最优解的风险,提高了神经网络的训练效率,加快了网络的收敛速度。考虑风电齿轮箱振动信号的不确定性、非平稳性和复杂性,提取功率谱熵、小波熵、峭度、偏度、关联维数和盒维数作为故障特征。经测试,算法诊断结果正确,表明了PSO优化BP神经网络用于风电机组齿轮箱故障诊断的有效性和实用性。 相似文献
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人工智能技术的飞速发展为现代能源装备的精益化故障诊断与健康管理提供了可能。风电齿轮箱由多个齿轮、轴承组成,且长期在变速、变载荷工况下运行,依靠传统的故障特征提取结合机器学习方法进行故障诊断存在精度低、缺乏智能性等缺点。文章提出了基于一维密集连接卷积网络的风电齿轮箱故障分类方法:将原始振动信号直接送入网络模型,经过密集连接、合成连接与卷积运算,匹配对应的故障类型,迭代训练故障分类模型;振动信号输入模型后的分类结果决定所属故障类别。文章所提出的风电齿轮箱故障分类方法具有诊断流程简单、故障识别率高等特点,多工况试验台故障数据验证了该方法的有效性。 相似文献
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Aimed at the difficulty of diagnosing the transmission system of wind turbine under variable working conditions, a novel health condition monitoring method based on common features distribution adaptation is proposed in this article. In the method, envelope analysis is first performed on the collected signals, and then the time-frequency features are extracted to be combined as new input samples. The feature set under the working condition similar to target working condition is selected as the auxiliary sample set in source domain through the evaluation of the transferability. The kernel function is used to map the labeled auxiliary samples and unlabeled target samples to a reproduced kernel Hilbert space, which effectively reduces the data distribution discrepancy between source and target domains. The problem of class imbalance in each domain is taken into account when performing fault recognition, which improves the effect of transfer learning. Finally, the adjusted source domain is used to train the classifier, which is applied to the target domain to get the predicted labels of the test data. Experiment shows that the proposed method has better working performance than traditional fault diagnosis methods. 相似文献
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An artificial neural network‐based condition monitoring method for wind turbines,with application to the monitoring of the gearbox 下载免费PDF全文
Major failures in wind turbines are expensive to repair and cause loss of revenue due to long downtime. Condition‐based maintenance, which provides a possibility to reduce maintenance cost, has been made possible because of the successful application of various condition monitoring systems in wind turbines. New methods to improve the condition monitoring system are continuously being developed. Monitoring based on data stored in the supervisory control and data acquisition (SCADA) system in wind turbines has received attention recently. Artificial neural networks (ANNs) have proved to be a powerful tool for SCADA‐based condition monitoring applications. This paper first gives an overview of the most important publications that discuss the application of ANN for condition monitoring in wind turbines. The knowledge from these publications is utilized and developed further with a focus on two areas: the data preprocessing and the data post‐processing. Methods for filtering of data are presented, which ensure that the ANN models are trained on the data representing the true normal operating conditions of the wind turbine. A method to overcome the errors from the ANN models due to discontinuity in SCADA data is presented. Furthermore, a method utilizing the Mahalanobis distance is presented, which improves the anomaly detection by considering the correlation between ANN model errors and the operating condition. Finally, the proposed method is applied to case studies with failures in wind turbine gearboxes. The results of the application illustrate the advantages and limitations of the proposed method. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
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齿轮箱故障是造成风电机组停机时间最长的一种故障,对其故障进行早期预警,对保证整机的可靠运行和减少维修费用具有重要意义。文章提出了一种基于确定性随机子空间方法的齿轮箱故障预测算法,首先,该算法利用齿轮箱正常状态的实时监测振动和转速数据,建立齿轮箱的状态空间模型,并得到一组参考特征值;然后利用这组参考特征值与实际监测数据所求特征值进行比较,利用均方根误差(RMSE)作为齿轮箱故障预警指标,并结合统计过程控制原理定义该指标的门槛值,来实现对齿轮箱运行状态的监控。通过对实际监测数据的仿真验证,表明了所提方法的正确性和有效性。 相似文献
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Condition monitoring (CM) of wind turbine becomes significantly important part of wind farms in order to cut down operation and maintenance costs. The large amount of CM system vibration data collected from wind turbines are posing challenges to operators in signal processing. It is crucial to design sensitive and reliable condition indicator (CI) in wind turbine CM system. Bearing plays an important role in wind turbine because of its high impact on downtime and component replacement. CIs for wind turbine bearing monitoring are reviewed in the paper, and the advantages and disadvantages of these indicators are discussed in detail. A new engineering CI (ECI), which combined the energy and kurtosis representation of the vibration signal, is proposed to meet the requirement of easy applicability and early detection in wind turbine bearing monitoring. The quantitative threshold setting method of the ECI is provided for wind turbine CM practice. The bearing run‐to‐failure experiment data analysis demonstrates that ECI can evaluate the overall condition and is sensitive to incipient fault of bearing. The effectiveness in engineering of ECI is validated though a certain amount of real‐world wind turbine generator and gearbox bearing vibration data. 相似文献
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为了延长风电机组平稳运行时长和减少故障停机次数,文章基于有监督主成分分析(SPCA)的Hotelling-T~2和Q统计量控制图,提出了一种风电机组状态监测与评估方法。首先,根据风电机组SCADA历史数据提取正常状态数据。然后,训练集成学习模型拟合主要状态变量,采用贝叶斯优化算法优化其中的超参数。最后,在移动时间窗内利用SPCA方法将监测数据分解到主成分空间与残差空间,计算真实数据与参考状态数据的Hotelling-T~2和Q统计量,并同时求取两种统计量的斯皮尔曼系数,通过划定阈值对机组进行状态评估。将该方法用于某风电场1.5 MW级风电机组,结果表明,该方法能够有效地对机组当前状态进行监测并识别出功率输出故障。 相似文献