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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Rui Liu Shilong Niu Li Chen Qing He Tianhe Yang Meng Huang State Grid On-site Test and Evaluation Technology Laboratory for High Voltage Electrical Equipment (Hubei Electrical Power Research Institute) Wuhan China State Key Laboratory of New Energy Power System North China Electric Power University Beijing China State Grid Hubei Power Co. Wuhan China

In the existing threshold calculation methods, there are problems such as establishing distribution models based on large group data of different types of oil-filled equipment, or specifying the threshold using normal dissolved gases analysis (DGA) data of some individuals while fault data of others, etc. In order to address these problems, this paper proposes a differentiation gas content threshold calculation method applicable to large oil-filled equipment individuals. The method is based on the gas content normal data and fault data of individuals of oil-filled equipment, establishes parameter model based on the Weibull distribution to fit the data, and uses the inverse cumulative distribution function and the P-R curve to calculate and select the reasonable thresholds as the attention value and warning value. The differentiated thresholds are obtained for five kinds of large oil-filled equipment individuals, and compared with the traditional threshold calculation method, the thresholds obtained by this method are more effective in identifying defects and faults, and can significantly reduce the occurrence of false alarms and omissions.

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Measurement of 3d Pavement Morphology Using Improved Binocular Reconstruction Under Structured Light Constraint Mechanism

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SSRN 2024年

作者： Wang, Yuanyuan Zhang, Hengtong Shu, Haicheng Wang, Zhongren Xue, Jinshun Yang, Jianhua Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Hubei University of Arts and Science No.296 Longzhong Road Xiangyang441053 China School of Mechanical Engineering Hubei University of Arts and Science No.296 Longzhong Road Xiangyang441053 China Enterprise Technical Center Bridge Construction Group Co.Ltd Xiangyang Road Xiangyang441023 China School of Civil Engineering and Architecture Hubei University of Arts and Science No.296 Longzhong Road Xiangyang441053 China

For the special object of asphalt pavement, due to dark surface color, weak regional texture, and inconspicuous features points, traditional binocular vision is not ideal for measuring the three-dimensional (3D) morphology. To achieve accurate measurement of 3D pavement morphology, this paper introduced sine-encoded stripe structured light and explores a matching strategy that combines image spatial domain information with frequency domain phase information. The phase shift iterative matching algorithm under structured light constraint mechanism was proposed. A binocular reconstruction measurement system was subsequently constructed to evaluate the measurement accuracy of the proposed algorithm and the measurement effect in real scenarios. The results show that the constraint effect of structured light enhances the effective matching between pixels and improves the measurement accuracy. The maximum absolute deviation measured by the proposed algorithm is only 0.4 mm, which can meet the precision requirements of 3D pavement morphology measurement. © 2024, The Authors. All rights reserved.

关键词： Morphology

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Measurement of 3d Pavement Morphology Using Improved Binocular Reconstruction Under Structured Light Constraint Mechanism

SSRN

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SSRN 2024年

关键词： Morphology

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Sub-Synchronous Oscillation Damping Controller design for Doubly-Fed Wind Turbines Considering Oscillation Frequency Detection

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SSRN 2024年

作者： Qin, Shiyao Wang, Zehui Li, Shaolin Chen, Renjie Jia, Lingjie Peng, Xiaotao China Electric Power Research Institute Haidian District Beijing China Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy School of Electrical Engineering and Automation Wuhan University Wuhan China School of Electrical Engineering and Automation Wuhan University Wuhan China Wuhan Iron & Steel Design & Research Institute China

Doubly fed induction generators are widely used in wind power generation because of their efficient and low-cost power generation and active-reactive power decoupling control features. In this paper, we propose a parametric adaptive damping controller based on oscillation detection to address the problem of sub-synchronous oscillations in doubly fed induction generators connected to the grid by series compensation. This paper firstly constructs the impedance model of grid-connected doubly-fed wind turbine and analyzes the characteristics of the sub-synchronous oscillation based on impedance analysis and then concludes that the negative equivalent resistance at the resonance frequency is the reason for the sub-synchronous oscillation. Subsequently, a damping controller based on proportional resonance is designed, and a parameter design method is proposed by impedance analysis. Finally, the oscillation suppression effect of the controller is analyzed by time domain simulation and it is tested that the controller can suppress sub-synchronous oscillation and has adaptability in scenarios with different parameters. © 2024, The Authors. All rights reserved.

关键词： Wind turbines

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Field-Harmonic-Oriented design of Vernier Permanent Magnet Machine Towards High Torque Density and Low Torque Ripple

Field-Harmonic-Oriented Design of Vernier Permanent Magnet M...

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International Conference on electrical Machines and systems (ICEMS)

作者： Li Fang Dawei Li Yuanzhi Zhang Jiewen Wu School of Electrical and Electronics Engineering Huazhong University of Science and Technology Wuhan China School of Electricla Engineering and Automation (Hubei Key Laboratory of Power Equipment and System Security for Integrated Energy) Wuhan University Wuhan China College of Design and Engineering National University of Singapore Singapore

Vernier permanent magnet machine (VPMM) has been a promising candidate for low-speed large-torque applications owing to high torque density based on multiple-magnetic field-harmonics working principle However, rich field harmonics also cause large torque ripple, meanwhile the regular reducing methods will also undermine torque density. In this paper, the field-harmonic-oriented design approach is proposed for the VPMM towards high torque density and low torque ripple. Based on the permeance unit model, the mapping relationship between torque output and field harmonics is built. Explicit design regulations are established for the airgap structure so as to modulate the optimal field harmonics composition. Via the proposed method, a surface-mounted VPMM is purposely designed and the electromagnetic performance is verified by FEA. Finally, a prototype of the proposed machine has been manufactured and tested. Both analytical and experimental results validate the feasibility of the proposed design method.

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Weighted registration of multiple trajectories of dynamic objects for online calibration of MMW radar and camera

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Measurement Science and Technology 2025年第6期36卷

作者： Huang, Gang Dong, Qinlei Cao, Huiling Chen, Zhenling Hu, Zhaozheng School of Automobile and Traffic Engineering Wuhan University of Science and Technology Wuhan430081 China Intelligent Transportation Systems Research Center Wuhan University of Technology Wuhan430063 China Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Xiangyang441053 China

Multi-sensor fusion can improve the accuracy and reliability of information perception and is widely used in autonomous driving, smart AGVs, drones, and other intelligent agents. Considering the comprehensive efficiency and economy, the fusion of millimeter wave (MMW) radar and camera with complementary advantages is a potential solution in autonomous driving perception. The calibration flexibility of the two sensors determines the usability of the perception system. Unlike traditional offline calibration, dynamic calibration allows for flexible calibration using dynamic targets found in the environment. It can be applied when cumbersome offline calibration can not be performed or specific calibration templates are unavailable. The paper proposes dynamic calibration of MMW radar and camera by fusing trajectory constraints and multi-target (radar cross section) RCSs, On the one hand, trajectory constraints can preliminarily achieve the calibration of external parameters. On the other hand, introducing RCS can enhance the accurate tracking of target trajectories, enabling automated trajectory generation. By assigning higher calibration weights to trajectories with larger RCS values, both the calibration accuracy and the robustness of the entire perception system can be further improved. The selection of multiple targets ensures the wide applicability of the calibration results. RCS information reflects the signal-to-noise ratio of the target. Compared with existing traditional methods, this algorithm does not require dedicated calibration equipment. As targets are continuously acquired, more accurate calibration results can be iteratively refined. The algorithm offers high computational efficiency and good performance. Additionally, when sensors become loose while the vehicle is in operation, this algorithm can update the calibration results in conjunction with the system’s miscalibration detection mechanism, ensuring the long-term reliability of the entire system. Si

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Research on visibility detection model optimization based on dark channel prior and image entropy and visibility development trend prediction

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IOP Conference Series: Earth and Environmental Science 2021年第1期826卷

作者： Hao Zhou Mingyu Dai Dapai Shi Yuchi Meng Boyang Peng Tingxuan Chen Vehicle Engineering Jilin University Changchun Jilin 130000 China Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Hubei University of Arts and Science Xiangyang Hubei 441053 China

In this paper, a visibility detection model based on the dark channel prior and image entropy is established to improve the lane line detection algorithm. Our algorithm does not need to preset the target, nor is it affected by the camera calibration parameters and position. It transforms the visibility calculation problem into the atmosphere transmittance calculation problem and refines the required results through the guided filter, achieving more accurate and stable visibility estimation results. In addition, based on the changing regularity of the visibility over time obtained by the detection model, a mathematical model is established to predict the change of heavy fog. We use ADF to test the visibility obtained in the visibility detection model and calculate the autocorrelation and partial autocorrelation functions. Finding the original sequence non-stationary, we perform the difference on the data, remove all insignificant factors and then incorporate the data into ARIMA model for fitting, finally getting the fitting and prediction results. The results are found similar to the actual situation, indicating that the results obtained by the visibility prediction model are robust and reliable.

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Corrigendum to “design of sub-synchronous oscillation proportional resonance damping controller for doubly-fed wind turbines based on impedance analysis” [Int. J. Electr. power Energy Syst. 162 (2024) 110333]

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International Journal of electrical power & Energy systems 2025年 164卷

作者： Shiyao Qin Zehui Wang Shaolin Li Renjie Chen Lingjie Jia Xiaotao Peng China Electric Power Research Institute Haidian District Beijing China Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy School of Electrical Engineering and Automation Wuhan University Wuhan China School of Electrical engineering and Automation Wuhan University Wuhan China Wuhan Iron & Steel Design & Research Institute China

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Research on large equipment maintenance system in life cycle

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IOP Conference Series: Earth and Environmental Science 2017年第1期69卷

作者： Xiaowei Xu Hongxia Wang Zhenxing Liu Nan Zhang School of Automobile and Traffic Engineering Wuhan University of Science and Technology Wuhan 430081 China Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Xiangyang 441053 China

In order to change the current disadvantages of traditional large equipment maintenance concept, this article plans to apply the technical method of prognostics and health management to optimize equipment maintenance strategy and develop large equipment maintenance system. Combined with the maintenance procedures of various phases in life cycle, it concluded the formulation methods of maintenance program and implement plans of maintenance work. In the meantime, it takes account into the example of the dredger power system of the Waterway Bureau to establish the auxiliary platform of ship maintenance system in life cycle.

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