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Bearing Fault Diagnosis Method of Wind Turbine Based on Improved Anti-Noise Residual Shrinkage Network

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Energy Engineering 2022年第2期119卷 665-680页

作者： Xiaolei Li beijing goldwind science&goldwind huineng technology co. Ltd.Beijing100176China

Aiming at the difficulty of rolling bearing fault diagnosis of wind turbine under noise environment,a new bearing fault identification method based on the Improved Anti-noise Residual Shrinkage Network(IADRSN)is proposed.Firstly,the vibration signals of wind turbine rolling bearings were preprocessed to obtain data samples divided into training and test sets.Then,a bearing fault diagnosis model based on the improved anti-noise residual shrinkage network was established.To improve the ability of fault feature extraction of the model,the co.volution layer in the deep residual shrinkage network was replaced with a Dense-Net layer.To further improve the anti-noise ability of the model,the first layer of the model was set as the Drop-block layer.Finally,the labeled data samples were used for training model and the trained model was applied to the test set to output the fault diagnosis results.The results showed that the proposed method co.ld achieve the fault diagnosis of wind turbine bearing more accurately in the high noise environment through co.parison and verification.

关键词： Bearing fault diagnosis improved residual shrinkage network noise immunity

Dynamic characteristics of large permanent magnet direct‐drive generators co.sidering electromagnetic–structural co.pling effects

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International Journal of Mechanical System Dynamics 2023年第1期3卷 25-38页

作者： Qinkai Han Xueping Xu Zhihong Zhang Yifeng Yan Chao Peng Fulei Chu Department of Mechanical Engineering The State Key Laboratory of TribologyTsinghua UniversityBeijingChina School of Instrumentation and Optoelectronic Engineering Research Institute for Frontier ScienceBeihang UniversityBeijingChina Institute of Research Center Xinjiang Goldwind Science and Technology Co.Ltd.XinjiangChina

Dynamic characteristics of large permanent magnet direct‐drive generators(PMDGs)co.sidering electromagnetic–structural co.pling effects are analyzed in this study.Using the co.formal mapping method,the scalar magnetic potential of the air gap magnetic field co.sidering the slot effect is calculated.On the basis of the discrete current element and magnetic equivalent circuit model,the local magnetic saturation effect of the stator and rotor is quantitatively simulated and the air gap magnetic field intensity distribution is obtained via numerical simulation.A series of uniformly distributed equivalent electromagnetic springs are introduced to develop an electromagnetic–structural co.pling finite element PMDG model.The proposed air gap field analysis method is verified by the finite element analysis results.On the basis of the test platform for the goldwind 1.5MW PMDG,both modal and dynamic response tests for the stator/rotor co.pling system are co.ducted,and the results are co.pared with the natural frequencies,mode shapes,and vibration responses obtained using the numerical model.The effects of the air gap length and rotor speed on the natural frequencies of the co.pling system are analyzed.The proposed model has the potential to accurately evaluate the PMDG vibration energy,avoiding resonance points,and maintaining stable operations of the unit.

关键词： permanent magnet direct‐drive generators dynamic characteristics electromagnetic–structural co.pling effects co.formal mapping magnetic equivalent circuit model electromagnetic springs

Nodes2STRNet for structural dense displacement reco.nition by deformable mesh model and motion representation

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International Journal of Mechanical System Dynamics 2023年第3期3卷 229-250页

作者： Jin Zhao Hui Li Yang Xu Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information technology Harbin Institute of TechnologyHarbinChina Key Lab of Structures Dynamics Behavior and co.trol of the Ministry of Education Harbin Institute of TechnologyHarbinChina School of Civil Engineering Harbin Institute of TechnologyHarbinChina Department of System Design and Simulation Goldwind Science and Technology Co.Ltd.BeijingChina

Displacement is a critical indicator for mechanical systems and civil structures.co.ventional vision-based displacement reco.nition methods mainly focus on the sparse identification of limited measurement points,and the motion representation of an entire structure is very challenging.This study proposes a novel Nodes2STRNet for structural dense displacement reco.nition using a handful of structural co.trol nodes based on a deformable structural three-dimensional mesh model,which co.sists of co.trol node estimation subnetwork(NodesEstimate)and pose parameter reco.nition subnetwork(Nodes2PoseNet).NodesEstimate calculates the dense optical flow field based on FlowNet 2.0 and generates structural co.trol node co.rdinates.Nodes2PoseNet uses structural co.trol node co.rdinates as input and regresses structural pose parameters by a multilayer perceptron.A self-supervised learning strategy is designed with a mean square error loss and L2 regularization to train Nodes2PoseNet.The effectiveness and accuracy of dense displacement reco.nition and robustness to light co.dition variations are validated by seismic shaking table tests of a four-story-building model.co.parative studies with image-segmentation-based Structure-PoseNet show that the proposed Nodes2STRNet can achieve higher accuracy and better robustness against light co.dition variations.In addition,NodesEstimate does not require retraining when faced with new scenarios,and Nodes2PoseNet has high self-supervised training efficiency with only a few co.trol nodes instead of fully supervised pixel-level segmentation.

关键词： structural dense displacement reco.nition deformable structural mesh model deep-learning-based monocular vision self-supervised learning

PV Power Forecasting Using an Integrated GA-PSO-ANFIS Approach and Gaussian Process Regression Based Feature Selection Strategy

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CSEE Journal of Power and Energy Systems 2018年第2期4卷 210-218页

作者： Yordanos Kassa Semero Jianhua Zhang Dehua Zheng School of Electrical and Electronic Engineering North China Electric Power UniversityBeijing 102206China goldwind science and technology co. Ltd.Beijing 100176China

This paper presents a hybrid approach for the forecasting of electricity production in microgrids with solar photovoltaic(PV)installations.An accurate PV power generation forecasting tool essentially addresses the issues resulting from the intermittent and uncertain nature of solar power to ensure efficient and reliable system operation.A day-ahead,hourly mean PV power generation forecasting method based on a co.bination of genetic algorithm(GA),particle swarm optimization(PSO)and adaptive neuro-fuzzy inference systems(ANFIS)is presented in this study.Binary GA with Gaussian process regression model based fitness function is used to determine important input parameters that significantly influence the amount of output power of a PV generation plant;and an integrated hybrid algorithm co.bining GA and PSO is used to optimize an ANFIS based PV power forecasting model for the plant.The proposed modeling technique is tested based on power generation data obtained from goldwind microgrid system found in beijing.Forecasting results demonstrate the superior performance of the proposed method as co.pared with co.monly used forecasting approaches.The proposed approach outperformed existing artificial neural network(ANN),linear regression(LR),and persistence based forecasting models,validating its effectiveness.

关键词： ANFIS binary genetic algorithm feature selection hybrid method particle swarm optimization PV power forecasting

The behavior of deep co.vective clouds over the warm pool and co.nection to the Walker circulation

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science China Earth sciences 2018年第11期61卷 1605-1621页

作者： Wenjing SHI Ziniu XIAO Yufei AI beijing Institute of Applied Meteorology Beijing 100029 China beijing goldwind science & Creation Windpower Equipment co. Ltd. Xinjiang Goldwind Science & Technology Co. Ltd. Beijing 100176 China State Key Laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic Sciences School of Physics Peking University Beijing 100871 China

As the deep co.vective clouds(DCCs) over the western Pacific and Indian Ocean warm pool may play different roles in the climate system, variations in DCC properties over these two sectors are investigated and co.pared. The DCC intensity and area varies more significantly in the Indian Ocean than the western Pacific sector, while the DCC frequency is co.parable in both sectors at the seasonal scale. Although the Indian Ocean sector is strongly dominated by the seasonal evolution, the interannual variations in the two sectors are co.parable for all three DCC properties(frequency, intensity, and area). Besides,Walker circulation is closely co.related with the interannual variability of DCCs in both sectors. The Walker circulation strengthens(weakens) as the DCCs shift eastward(westward) over the Indian Ocean sector and westward(eastward) over the western Pacific sector. When more or stronger DCCs occur over the Indian Ocean sector(western Pacific sector), the Walker circulation beco.es stronger(weaker) and shifts westward(eastward). Interestingly, the response of the Walker circulation to DCC variability over the warm pool is asymmetry. The asymmetry response of the Walker circulation to the negative and positive DCC anomaly may be related to the non-linearity internal variability of the atmosphere. DCCs over the Indian Ocean sector have a much weaker nonlinear co.relation with the Walker circulation than DCCs over the western Pacific sector.

关键词：发行量深对流水池温暖不对称现象连接行为印度洋

A co.parative study of pseudo-static slope stability analysis using different design co.es

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Water science and Engineering 2018年第4期11卷 310-317页

作者： Xin-guang Yang En-di Zhai Yuan Wang Zhong-bo Hu Central Research Institute of Building and co.struction co. Ltd. MCC Group Beijing 100088 China goldwind science & technology co. Ltd. Beijing 100176 China co.lege of Mechanics and Materials Hohai University Nanjing 210098 China China Three Gorges co.poration Beijing 100038 China

Many researchers have developed new calculation methods to analyze seismic slope stability problems, but the co.ventional pseudo-static method is still widely used in engineering design due to its simplicity. Based on the Technical co.e for Building Slope Engineering(GB 50330-2013) of China and the Guidelines for Evaluating and Mitigating Seismic Hazards in California(SP117), a co.parative study on the pseudo-static method was performed. The results indicate that the largest difference between these two design co.es lies in determination of the seismic equivalence reduction factor( f_(eq)). The GB 50330-2013 co.e specifies a single value for f_(eq) of 0.25. In SP117, numerous factors,such as magnitude and distance, are co.sidered in determining f_(eq). Two case studies show that the types of slope stability status evaluated by SP117 are in agreement with those evaluated by the seismic time-history stability analysis and Newmark displacement analysis. The factors of safety evaluated by SP117 can be used in practice for safe design. However, the factors of safety evaluated by GB 50330-2013 are risky for slope seismic design.

关键词： Earthquake Slope stability Pseudo-static method Design co.e

Design Methodology Research of the Floating Foundation for the Offshore MW-Rating Wind Turbine

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Journal of Energy and Power Engineering 2014年第5期8卷 882-889页

作者： Rongfu Li Haifei Zhu Tingting Wang goldwind science &technology co. Ltd. Beijing 100176 China

A Modelling Study on PM_(2.5)-Related Health Impacts from Climate Change and Air Pollution Emission co.trol--China,2010s and 2040s

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China CDC weekly 2021年第23期3卷 500-506页

作者： Jing Huang Heng Tian Jiawei Wang Teng Yang Yiran Peng Shaowei Wu Tzung-May Fu Guoxing Li Department of Occupational and Environmental Health sciences Peking University School of Public HealthBeijingChina beijing goldwind science&Creation Windpower Equipment co. LtdBeijingChina Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijingChina Department of Occupational and Environmental Health School of Public HealthXi’an Jiaotong University Health Science CenterXi’anShaanxiChina School of Environmental science and Engineering Southern University of Science and TechnologyShenzhenGuangdongChina

What is already known about this topic?Climate change and air pollution are two important environmental issues in China.It is important to investigate particulate matter with aerodynamic diameter less than 2.5μm(PM2.5)-related health impacts from climate change and air pollution emission co.trol.What is added by this report?Deaths and years of life lost related to PM2.5 would increase in climate change scenario,although emission co.trol would outweigh the influence of climate change.What are the implications for public health practice?More targeted actions should be taken to meet challenges of exacerbated PM2.5 pollutions and its health impacts related to climate change in the future.

关键词： pollution China. Pollution

Voltage Stabilization of Hybrid Micro-Grid Using Super Capacitors

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Journal of Power and Energy Engineering 2015年第6期3卷 1-9页

作者： Jamshed Khan Usman Nasir goldwind science and technology co. Ltd. Beijing China North China Electric Power University Beijing China

Scarcity of fossil fuel resources has motivated the researchers to develop renewable energy based power projects. Instead of using a single or independent renewable energy source, it is preferable to use the co.bination of such energy sources in a distributed way to co.pensate the power fluctuations of the system and this leads to the co.cept of hybrid micro-grid energy. Voltage stability is an important parameter for the secure operation of the hybrid-micro grid, and IEEE 1547 Standard defines the limit of the voltage for the successful operation of the micro-grid. Although Vanadium Redox Batteries (VRBs) can help the system to stabilize the voltage when voltage sag occurs when a heavy load is suddenly co.nected to the system, this stabilization process takes some time. This paper discusses the application of super capacitors to the hybrid micro-grid system, as a higher energy density element, to help the system quickly reco.er its transient voltage.

关键词： Super Capacitors Micro-Grid Voltage Sags Voltage Stabilization Hybrid Micro-Grid