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检索条件"机构=State Key Lab of Advanced Electromagnetic Engineering Technology"

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A Physics-Informed Neural Network Model for Temperature Inversion of Axisymmetric Gas Discharge Channel 4th

A Physics-Informed Neural Network Model for Temperature Inve...

引用

4th International Symposium on Insulation and Discharge Computation for Power Equipment, IDCOMPU 2023

作者： Liu, Zhenyu Xiao, Lilang Chen, Shen Huang, Yubin He, Hengxin Chen, Weijiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9789819974047

The accurate measurement of gas discharge channel temperature is of great significance for the study of lightning physics. How to accurately solve the Abel equation and reduce the impact of noise accumulation is the key to the accurate inversion of the temperature. Physics-Informed Neural Networks (PINN) have shown promising future by combining the data driving nature of neural network with physical information guidance. In this paper, the schlieren image dataset is generated by assuming temperature distribution and simulations. With the dataset, the model is developed by training a PINN guided by inverse Abel transform, where the input is a schlieren image and the output is the distribution of relative gas destiny. After training, the results show that the accuracy of the proposed PINN method is close to that of other numerical algorithms, while PINN shows a significant improvement in computation speed. Moreover, compared with other methods, the accuracy of the PINN method remains stable under varying levels of noise, indicating its robustness, while the traditional methods are significantly affected by noise. The results of this paper indicate that PINN is more efficient in temperature inversion fields and more resistant to the effects of noise than previous methods, providing strong support for gas discharge temperature inversion. © Beijing Paike Culture Commu. Co., Ltd 2024.

关键词： Inverse problems

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Research on Rotor Strength and Critical Speed of the Air-Core Pulsed Alternator 10

Research on Rotor Strength and Critical Speed of the Air-Cor...

引用

10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

作者： Wan, Jijian Yu, Kexun Wang, Jiasong Xie, Xianfei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9789038661353

The Air-Core Pulsed Alternator (APA) is the preferred power supply for electromagnetic launch systems [1]. However, due to the enormous centrifugal force and the electromagnetic impact torque, extremely high demands are placed on the strength of the rotor structure. In addition, the design speed of APA is usually high, requiring the machine to pass through the first-order critical speed rapidly to avoid the occurrence of resonance. This paper investigated the structural strength and critical speed of the rotor, as these are two of the most common issues considered in the structural design of the rotor of APA, and discussed the design of the main dimensions of the rotor on this basis. © 2024 Eindhoven University of technology.

关键词： electromagnetic launchers

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Study on transient and steady-state processes of corona discharge ionic wind 50

Study on transient and steady-state processes of corona disc...

引用

50th EPS Conference on Plasma Physics, EPS 2024

作者： Chen, Huan Li, Chuan Yang, Yong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798331305239

When a high voltage is applied to the electrode with a higher curvature, an ionic wind is generated between the two electrodes. This study visualizes the ionic wind using tracer particles and uses Particle Image Velocimetry (PIV) techniques to obtain the flow field of the ionic wind, investigating both transient and steady-state processes. The results indicate that during the transient phase of negative corona ionic wind, multiple jets are generated at the needle electrode and move towards the mesh electrode, with subsequent jets exhibiting higher velocities compared to earlier jets. In contrast to the transient ionic wind, the steady-state ionic wind exhibits greater maximum velocities and an extended effective jet range. © 2024 50th EPS Conference on Plasma Physics, EPS 2024. All rights reserved.

关键词： electromagnetic transients

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An Inductance-Slope-Based Sensorless Control Method for Switched Reluctance Motor 27

An Inductance-Slope-Based Sensorless Control Method for Swit...

引用

27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Zeng, Fanyan Wang, Shuanghong Li, Zixin Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9784886864406

This paper proposes a sensorless control method for switched reluctance motor (SRM) based on the inductance slope of conduction phase. First, the characteristic of inductance variation with respect to position and current is analyzed. It is observed that the inductance slope at different current levels rapidly increases at nearly the same position. Then, building on this observation, a position and speed estimation method is designed, which does not require complex online calculations or complex offline calibration experiments. Finally, experiments are carried out on a 15 kW three-phase 12/8 SRM platform to validate the effectiveness and robustness of the proposed method under different speeds and loads. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Reluctance motors

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Pulse Extraction from Signals Sensed at Neutral Point of Large Hydro Generators 4

Pulse Extraction from Signals Sensed at Neutral Point of Lar...

引用

4th International Conference on Electrical engineering and Control Science, IC2ECS 2024

作者： Zhou, Deyuan Li, Zhaohui Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798331510107

The difficulty of online monitoring of fault discharge of large hydro generators lies in the processing of monitoring signals intertwined by noise, interference and various fault discharge pulses. Pulsed high-fidelity extraction is a critical step. The pulse extraction method based on sliding window energy in the time domain is fast and has a good effect on the oscillating pulse, but the extraction effect will deteriorate rapidly when the signal-to-noise ratio is low. In addition, the background noise intensity, as a key parameter, relies on manual selection of appropriate data segments for estimation. The number of sliding window points, as a key parameter, relies on manual acquisition of the pulse oscillation period. In this paper, an iterative estimation method of background noise intensity is used to automatically determine the background noise intensity. In this paper, the signal is transformed into wavelets, and the wavelet domain sliding window is used to extract the decomposition coefficient of the pulse, and the number of sliding window points does not need to manually obtain the pulse oscillation period. The pulse extraction results of both simulated and measured signals show that the proposed method has a better pulse extraction effect than the wavelet threshold denoising, and has a better and more stable pulse extraction effect than the pulse extraction method based on time-domain sliding window energy. © 2024 IEEE.

关键词： Signal to noise ratio

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Rotating Object Detection Method of Insulator Defect Base on Improved YOLOv5 11th

Rotating Object Detection Method of Insulator Defect Base on...

引用

11th Frontier Academic Forum of Electrical engineering, FAFEE 2024

作者： Wang, Yunxuan Yong, Yang Li, Chuan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819787791

The precise localization of insulators in visible images is crucial for ensuring the integrity of power systems. In UVAs inspections, challenges such as arbitrary angles, dense distributions, and complex backgrounds often hinder accurate detection. However, existing methods primarily employ axial horizontal detection boxes to detect insulators, which overlook insulator characteristics. To further improve the accuracy, this paper optimizes YOLOv5 across four key areas: rectangular box representation, feature extraction, lightweight convolution, and detection head design. The results show that this paper uses rotating detection boxes instead of axial horizontal detection boxes, which removes a large amount of redundant background information and improves the average accuracy and operation speed. Our experiments on the insulator defect dataset achieved the average accuracy of 97.91% at an intersection ratio of 0.5. Additionally, our algorithm shows promise for extending to defect detection in various power equipment, laying a solid foundation for future automation initiatives. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Electric insulators

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An Online Torque Sharing Function with Torque Reference Self-Adjusting Method for Switched Reluctance Machines 27

An Online Torque Sharing Function with Torque Reference Self...

引用

27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Li, Zixin Wang, Shuanghong Zhou, Libing Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9784886864406

This paper proposes a torque sharing function (TSF) for Switched reluctance motor (SRM) based on the torque closed-loop compensation. Firstly, the online TSF method proposed in this paper takes the negative torque caused by current tailing into account and compensate it in the incoming phase. Secondly, the reference torque of incoming phase and outgoing phase are compensated through torque closed-loop, which enhance the system response ability. Thirdly, six-segment commutation intervals of the traditional TSF methods are divided into twelve segments and the switching states of commutation interval are reassigned, which reduces torque ripple caused by current tracking errors effectively. Simulation of the proposed TSF method and traditional TSF methods have been done on MATlab. The results prove that the proposed TSF method has lower torque ripple and better current tracking capability compared to the traditional TSF. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Reluctance motors

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Stability Analysis of Single-Loop Voltage-Magnitude Controlled Grid-Forming VSCs with Virtual Resistor

Stability Analysis of Single-Loop Voltage-Magnitude Controll...

引用

2024 CPSS and IEEE International Symposium on Energy Storage and Conversion, CPSS and ISESC 2024

作者： Zhou, Shunan Lin, Hua Li, Shaojie Electromagnetic Engineering and Technology Huazhong University of Science and Technology State Key Laboratory of Advanced Wuhan China

ISBN: (纸本)9798350380514

This article elaborates the stability analysis of the grid-forming (GFM) voltage-source converters (VSCs) with the single-loop voltage-magnitude (SLVM) control and the virtual resistor. It is revealed that the virtual resistor can greatly change the stability region of the SLVM controlled VSCs, even it is mainly used to eliminate the synchronous resonance introduced by the power control. The mathematical model is then derived, from which the stability region can be analytically obtained. Simulations and experiments validate the theoretical analysis. © 2024 IEEE.

关键词： Voltage-source converters

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Comparative Study of the Rectifier Topology for Efficient Renewable Power-to-Hydrogen System 14

Comparative Study of the Rectifier Topology for Efficient Re...

引用

14th International Conference on Power and Energy Systems, ICPES 2024

作者： Hu, Kewei Fang, Jiakun Zhong, Zhiyao Lu, Ang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350391329

The power ripple generated by the rectifier tends to pull down the power-to-hydrogen efficiency of water electrolyzers, which is rarely considered in the current research. In this paper, the impact of power ripple on electrolyzer performance is quantified based on electrochemical principle. Furthermore, different types of rectifiers, including thyristorbased, diode-based and IGBT-based rectifiers are compared in terms of efficiency. These topologies are further tested in the green hydrogen production system to find out the optimal topology to maximize the economical profit of the system. © 2024 IEEE.

关键词： energy conversion efficiency Power-to-hydrogen rectifier topology

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Second Order Generalized Integrator Filtering For Enhanced Sliding Mode Observer with Fuzzy Logic Switching Function 27

Second Order Generalized Integrator Filtering For Enhanced S...

引用

27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Cai, Kunsheng Wang, Shuanghong Li, Zixin Huazhong University of Sciecnce and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9784886864406

Traditional Sliding Mode Observers (SMO) in sensorless control of Permanent Magnet Synchronous Motors (PMSM) encounter issues such as chattering and phase delay, resulting in significant discrepancies between the estimated and actual rotor speed and position. Therefore, this paper proposes an improved SMO based on a Fuzzy Logic Controller (FLC) and an Open-Loop Frequency Estimation-based Second-Order Generalized Integrator Frequency Adaptive Filter (OLFE-SOGI) structure. The FLC implements an SMO with a selfadjusting shape factor for the sigmoid function. This strategy accelerates the convergence speed of the SMO while reducing chattering caused by the boundary layer thickness. Additionally, to mitigate the adverse effects brought by lowpass filters (LPF), the OLFE-SOGI is employed to accurately extract the back electromotive force (back-EMF) without phase delay and effectively eliminate high-order harmonic components. Simulation results verify the effectiveness and accuracy of the proposed strategy. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Permanent magnets

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