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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Zeng, Bingqian Hu, Tongning Tan, Ping Fan, Kuanjun Li, Junyang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

With the development of electromagnetic metrology, the issue of electric current quantization has been paid more attention but still confronts challenges. By recalling the previous proposal of introducing the theory and technique in electron-accelerators to the current quantization, the design of a prototype for electron-beam tuning is conducted based on both theoretical analysis and multi-particle calculations. Besides, an overall scheme of the equipment is illustrated explicitly, which is based on an existing electron-beam source and an additional tuning tube with adjustable slit combinations. Furthermore, corresponding beam dynamics simulations are performed precisely to verify the feasibility of the beam tuning equipment and demonstrate the influence factors on the stability of the generated current. Although it is an entirely new idea, simulation results show that the designed prototype is sufficient to provide preliminary experimental verification for further theoretical and engineering researches. © 2020 IEEE.

关键词： Electron beams

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Perfecting and extending the near-infrared imaging window

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Light(Science & Applications) 2021年第10期10卷 1949-1966页

作者： Zhe Feng Tao Tang Tianxiang Wu Xiaoming Yu Yuhuang Zhang Meng Wang Junyan Zheng Yanyun Ying Siyi Chen Jing Zhou Xiaoxiao Fan Dan Zhang Shengliang Li Mingxi Zhang Jun Qian State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310058 HangzhouChina Intelligent Optics&Photonics Research Center Jiaxing Institute of Zhejiang University314000 JiaxingZhejiang ProvinceChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070 WuhanChina Key Laboratory of Reproductive Genetics(Ministry of Education) Department of Reproductive EndocrinologyWomen’s HospitalZhejiang University School of Medicine310006 HangzhouChina College of Pharmaceutical Sciences Soochow University215123 SuzhouChina

In vivo fluorescence imaging in the second near-infrared window(NIR-II)has been considered as a promising technique for visualizing ***,the definition of the NIR-II region and the mechanism accounting for the excellent performance still need to be ***,we simulate the photon propagation in the NIR region(to 2340 nm),confirm the positive contribution of moderate light absorption by water in intravital imaging and perfect the NIR-II window as 900–1880 nm,where 1400–1500 and 1700–1880 nm are defined as NIR-IIx and NIR-IIc regions,***,2080–2340 nm is newly proposed as the third near-infrared(NIR-III)window,which is believed to provide the best imaging *** wide-field fluorescence microscopy in the brain is performed around the NIRIIx region,with excellent optical sectioning strength and the largest imaging depth of intravital NIR-II fluorescence microscopy to *** also propose 1400 nm long-pass detection in off-peak NIR-II imaging whose performance exceeds that of NIR-IIb imaging,using bright fluorophores with short emission wavelength.

关键词： perfect Perfect fir

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Vibration characteristics for shifted-angle of multi-module motor with carrier phase-shift method 1

Vibration characteristics for shifted-angle of multi-module ...

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Wang, Qiyuan Liu, Zicheng Jiang, Dong Liu, Kang Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781728196596

In recent years, the multi-module motor becomes more and more popular because of its advantage in control freedom. In the multi-module motor system driven by paralleled inverters, the carrier phase-shift modulation algorithm can change the phase of the radical electromagnetic force between the motor modules in high-frequency, which can change the motor vibration characteristics. This paper firstly analyzes the relationship between carrier shifted-angle and the radial electromagnetic force of the motor, theoretically. Then, the motor vibration experiments are implemented which obtains the vibration distribution of the multi-module motor under different carrier shifted-angles. According to theoretical analysis and experimental results, we can get the vibration characteristics and mechanism of multi-module motors with different carrier shifted-angles, which provide a new viewpoint for the further research on vibration reduction methods of multi-module motors. © 2020 IEEE.

关键词： Vibration analysis

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Torque Calculation of PMa-SynRM Using the Magnetic Equivalent Circuit 4

Torque Calculation of PMa-SynRM Using the Magnetic Equivalen...

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4th IEEE Student Conference on Electric Machines and Systems, SCEMS 2021

作者： Ling, Zaixun Shuai, Kang Cheng, Cheng Chen, Hao Zheng, Jingwen Wang, Jin State Grid Hubei Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781665436816

This paper proposes a torque analysis method for the design of PMa-SynRM. Firstly, an analytical model of the multilayer flux barrier structure of the rotor is established based on the magnetic equivalent circuit. To improve the calculation accuracy of the model, the effects of stator slotting and rotor magnetic bridge saturation are considered. Then, the analytical expression of the air gap flux density is derived and the output torque of the motor is calculated by the Lorentz force law, and the analysis results are verified by the finite element method. Finally, the torque performance of the motor under different flux barrier structures is compared through the analysis model. © 2021 IEEE.

关键词： Timing circuits

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Design and Analysis of a Novel Miniaturized Ultra-Thin Wide-Band Metamaterial Absorber

Design and Analysis of a Novel Miniaturized Ultra-Thin Wide-...

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International Applied Computational electromagnetics Society Symposium (ACES)

作者： Jingnan Ma Yan Li Erping Li School of electronics and information engineering Hebei University of Technology Tianjin China Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province China China Jiliang University Zhejiang China Key Laboratory of Advanced Micro-Nano Electronic Device & Smart Systems and Applications Zhejiang University Zhejiang China

The volume of existing metamaterial absorber (MMA) is not small enough to be applied in miniaturized devices such as chip level. To solve this problem, a miniaturized ultrathin wide-band MMA is proposed in this paper. The thickness of proposed MMA is 1.1mm with a absorption rate of 99.6% at 19.7GHz. This paper also analyzes the influence of parameters of the proposed MMA on the absorption performance and proves that it has a certain tunability of the absorption band. By comparing with other works, the MMA proposed in this paper realizes the miniaturization of the structure while ensuring ultra-wideband. This benefit offers a novel approach to address the problem of difficult loading electromagnetic shielding structures in miniaturized chip designs.

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An Improved Triple-Vector Modulated Model Predictive Control Method for Permanent Magnet Synchronous Motor

An Improved Triple-Vector Modulated Model Predictive Control...

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Workshop on Predictive Control of Electrical Drives and Power Electronics (PRECEDE)

作者： Dong Liu Wei Xu Han Xiao Pu Zhong Leilei Guo School of Electrical Engineering Zhengzhou Electric Power College Zhengzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China College of Electrical and Information Engineering Zhengzhou University of Light Industry Zhengzhou China State Grid Luohe Power Supply Company Luohe China

Model predictive control (MPC) has been widely used in motor control, and modulated model predictive control (MMPC) has been derived. However, in the conventional MMPC, the action time of the basic voltage vector is calculated by the inverse ratio of the cost function, which lacks a strictly theoretical basis. To enhance the theoretical basis of the MMPC, an improved triple-vector MMPC is proposed. First, two adjacent dual-vectors are synthesized by the conventional method. Then, the Helen’s formula and geometric relationship between the two dual-vectors are used to scale and synthesize the triple-vectors. Finally, the simulation verifies the effectiveness of the proposed method.

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Research on transient interaction mechanism of two PMSG considering different nodes and network characteristics 1

Research on transient interaction mechanism of two PMSG cons...

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Mao, Zichen Yuan, Xiaoming State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781728196596

Compared with the traditional AC power system, high proportion of renewable generation and power electronics are the characteristics of the power electronic dominated power system. The multi-time scale problem of the dynamical problems becomes prominent. There are complex interactions between power electronics. First, this paper describes the multi-time scale control links of equipment in the power electronic dominated power system and the mechanism of the multiscale with the example of permanent magnetic synchronous generator (PMSG).Second, a multi-time scale nesting model for analyzing interaction is proposed. Finally, the phenomenon of multi-time scale interaction between two PMSG is explained by simulation, and the influence of different node and network characteristics on the degree of interaction is explored, which provides references for subsequent analytical analysis. © 2020 IEEE.

关键词： Synchronous generators

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A Hybrid Deep Learning Framework With Local-Global Feature Extraction for Intelligent Power System Stability Assessment

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IEEE Transactions on Power Systems 2025年

作者： Yao, Wei Zhang, Runfeng Zhang, Yurun Wei, Shanyang Lan, Yutian Shi, Zhongtuo Wen, Jinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

Transient simulation is the key to ensure the safe and stable operation of power systems. After large disturbances, power systems may experience transient rotor angle instability and short-term voltage instability, which share similar electrical characteristics but require different control strategies. Therefore, distinguishing the dominant instability mode (DIM) is crucial. In this paper, a novel hybrid deep learning (DL) framework is proposed to achieve accurate DIM identification by fully extracting local-global features from electricity data. In the proposed framework, an advanced graph neural network (GNN) optimized by random sampling and aggregation is constructed. It can better capture local features than traditional GNN and help to improve model generalization ability. Further, important global features are mined by employing transformer network with self-attention mechanism to improve DIM identification accuracy. In addition, the vital discrete fault features are also embedded into the neural networks to improve the performance. The proposed method improves upon existing DL models by providing a solution for integrating multi-level features extracted by different schemes and addressing the limitation of focusing on a single instability mode. Case studies conducted on an 8-machine 36- bus system and Northeast China Power Grid verify the superiority of the proposed method over other state-of-the-art DL methods. © 1969-2012 IEEE.

关键词： Transient stability

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A weighted matching scheme of magnetic coil design for FRC shaping control

arXiv

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arXiv 2023年

作者： Qu, Zitong Zhu, Ping Chen, Zhipeng Li, Haolong Liu, Jiaxing State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Department of Nuclear Engineering and Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China

The two-dimentional (2D) separatrix shaping plays a crucial role in the confinement of the Field-Reversed Configuration (FRC), and the magnetic coils serve as an effective means for its control. In this work we develop a method to optimize the location, and current amplitude of the coils required for achieving the target separatrix shape. By iteratively calculating the coil currents, the plasma current, and the equilibrium magnetic flux, the equilibrium separatrix progressively converges towards the desired shape. The coil currents are determined through a matching method, and the NIMEQ code is employed to compute the FRC equilibrium with a Rigid Rotor type of plasma distribution. This approach enables the adaption of the equilibrium separatrix into any desired shape, thus offering a potential coil optimization scheme for the device design and the 2D shaping control of FRC plasma. Copyright © 2023, The Authors. All rights reserved.

关键词： Iterative methods

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Facilely Fabricating V2o3@C Nanosheets Grown on Rgo as High-Performance Negative Material for Lithium-Ion Batteries by Adjusting Surface Tension

SSRN

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SSRN 2022年

作者： Zhang, Dan Zhang, Chunyan Zhao, Yizhuo Zheng, Xuan Shi, Xinyu Yan, Mengmeng Li, Yuzhu Liu, Guangyin Liu, Xiaodi Yu, Chuang College of Chemistry and Pharmaceutical Engineering Nanyang Normal University Nanyang473061 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China

The flourish of insertion reaction type V 2 O 3 negative materials with large reversible capacity and outstanding rate performance is facing a huge trouble. In the study, we have successfully prepared V 2 O 3 @C/rGO composite by adjusting surface tension. The small V 2 O 3 @C nanosheets are fastened to reduced graphene oxide, which remarkably elevates electrons and lithium ions transfer rate. More importantly, the obvious interaction between V 2 O 3 and reduced graphene oxide is beneficial for faster charge transfer. The above features of V 2 O 3 @C/rGO composite are responsible for obtaining larger reversible capacity and superior rate capability. When applied to lithium-ion batteries as a negative material, it delivers a large reversible discharge capacity of 754 mA h g -1 at 100th cycle under 100 mA g -1 . Though under 2000 mA g -1 , V 2 O 3 @C/rGO still can give a large capacity of 409 mA h g -1 . This study would bring a novel light on the preparation of 2D materials and the efficient application of insertion reaction type materials. © 2022, The Authors. All rights reserved.

关键词： Surface tension

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