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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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Performance limits of high voltage press-pack SiC IGBT and SiC MOSFET devices

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Power Electronic Devices and Components 2022年 3卷

作者： Han, Lubin Liang, Lin Wang, Yijian Tang, Xinling Bai, Song State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Beijing Intelligent Energy Research Institute Beijing102209 China State Key Laboratory of Wide-Bandgap Semiconductor Power Electronic Devices the 55th Research Institute of China Electronics Technology Group Corporation Nanjing210016 China

Considering the switching frequency limit and electromagnetic interference, the selection of high voltage SiC IGBT and SiC MOSFET is confusing due to punch-through effect and bipolar characteristics of SiC IGBT. The thermal resistance, static characteristics and dynamic characteristics of SiC IGBT and SiC MOSFET module with Press-Pack packaging are measured to evaluate the switching frequency limit and electromagnetic interfere of them. The tradeoffs of SiC IGBT between switching frequency limit and electromagnetic interfere are less attractive due to the intrinsic characteristics, such as high power loss and punch-through effect. The possible solutions for SiC IGBT are proposed based on the improvement of driving resistor and driving voltage. © 2022 The Authors

关键词： Silicon carbide

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An engineering Approach for Short-Circuit Current Calculation Considering WTG Integrated

An Engineering Approach for Short-Circuit Current Calculatio...

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Power Energy Systems and Applications (ICoPESA), International Conference on

作者： Yiran Dong Hengchu Shi Dezhi Kong Hao You Jing Chen Shoudong Xu Jinfu Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Yunnan Electric Power Dispatching and Controlling Center China Southern Power Grid Kunming China System Analysis Department Scientific Research Institute of Yunnan Power Grid Kunming China

With the ever-increasing scale of wind power, the fault characteristics of power grids have changed dramatically, and the existing relay setting calculation approaches can no longer meet the requirements of modeling. The wind turbine generator (WTG) is usually treated as constant current source or set to zero to adapt to the traditional short-circuit current calculation software. This method does not consider the fault characteristics of the WTG, so the calculation accuracy is lower than that of iteration. However, the iterative algorithm also has problems, such as non-convergence or too many iterations leading to long computation time. Therefore, a calculation method of short-circuit current considering WTG integrated is proposed in this paper, which can solve the problem of iteration non-convergence while ensuring accuracy within the allowable range of engineering. Firstly, the WTG short-circuit current models considering converter control strategy and fault characteristics are established. Then, the branches with WTG are converted into "constant potential source + equivalent impedance" to facilitate WTG embedding in the relay protection setting calculation software and maintain consistency with the traditional synchronous generator equivalent mode. In addition, the calculation formula of equivalent impedance is deduced, and the modified voltage is also proposed to improve the accuracy. Finally, a simulation is performed in GIRGE B4-39 and part of actual power grids structures in a province to verify engineering practical value of the proposed method.

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Numerical simulation of disruption mitigation by applying non-resonant magnetic perturbation and massive gas injection on J-TEXT

Numerical simulation of disruption mitigation by applying no...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Zhen Li Zhonghe Jiang Fan Gu Zixiao Jiao Jianjun Yuan Keze Li Jinyu Xiong International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Institute of Fusion and Plasma Physics School of Electrical and Electronic Engineering

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477338

A lot of experimental and theoretical researches have been carrying out to examine the disruption mechanism and the methods to mitigate disruption, including massive gas injection (MGI) and shattered pellet injection (SPI). Based on NIMROD (non-Ideal Magnetohydrodynamics with Rotation, Open Discussion), numerical simulations of the synergistic effect between non-resonant magnetic perturbations and massive gas injection on disruption mitigation is carrying out in J-TEXT. In this paper, we investigate thermal quench, current quench time and the growth of $\mathrm{n}=1-3$ component MHD instabilities responsed to different amplitudes of non-RMPs. The results indicates that non-RMPs can prolong thermal quench and current quench durations and create stronger perturbations during disruption, leading to a high loss of runaway electrons seeds and reducing the hazard of disruption.

关键词： Electrical engineering Magnetohydrodynamics Perturbation methods Thermal quenching Impurities Numerical simulation Hazards

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Sodium phytate stabilizing lattice oxygen in high-nickel oxide cathodes for thermal runaway inhibition and high voltage operation

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Science bulletin 2025年

作者： Yuanke Wu Qiang Wu Ziqi Zeng Yixuan Dong Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China. Electronic address: ziqizeng@***. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China. Electronic address: xiejia@***.

The reactive oxygen species (O*) released from the nickel-rich layered oxide cathodes (LiNiCoMnO, NCM) are responsible for triggering thermal runaway (TR) in lithium-ion batteries (LIBs). Specifically, the charge compensation from transition metal (TM) 3d to oxygen (O) 2p in NCM plays a pivotal role in O* release. Here, inspired by the strong chelating effect of sodium phytate (PN) on TM, we employ PN as a cathode additive to coordinate with nickel, thereby weakening the charge compensation of TM 3d to O 2p on the surface of LiNiCoMnO (NCM811) and ultimately enhancing battery safety. It is shown that the chelation successfully stabilizes lattice oxygen and suppresses the release of O*, preventing detrimental phase transitions in NCM811 and reducing heat generation from O* related crosstalk reactions. Consequently, the TR trigger temperature (T) of NCM811 pouch cell with PN elevates from 125.9 to 184.8 °C, while the maximum temperature (T) decreases from 543.7 to 319.7 °C. Moreover, the PN-derived modification layer allows NCM811 to maintain exceptional cycling stability for over 700 cycles at 4.6 V. This strategy provides a facile method for stabilizing lattice oxygen in NCM, inhibiting O*-triggered TR, and enhancing high-voltage performance.

关键词： Battery safety Chelation Chemical crosstalk Lithium−ion battery Reactive oxygen species Thermal runaway

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Implementation and Preliminary Analysis of single/dual-SPI based on NIMROD

Implementation and Preliminary Analysis of single/dual-SPI b...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Zixiao Jiao Zhonghe Jiang Zhen Li Keze Li Jianjun Yuan International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Institute of Fusion and Plasma Physics School of Electrical and Electronic Engineering

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477338

Compared with massive gas injection(MGI), shattered pellet injection(SPI), as a method which is likely to apply on ITER, has advantages in deep injection and faster penetration speed. This paper introduces the NIMROD(non-Ideal MHD with Rotation, Open Discussion) code coupled with SPI module to carry out numerical simulations. Based on the SPI experiments on the J-TEXT, a set of SPI parameters are selected and scanned, including impurity amount, shattered degree and plume speed. From the results, simulations are in good agreements with experiments. Besides, the paper also achieve dual-SPI simulations which has mainly analyzed magnetic stochasticity and radiation. Though simulation results show dual-SPI may not evoke a higher MHD instabilities, it will bring different modes increasing situations. Dual-SPI will produce more radiation, advance thermal quench(TQ) and heighten current quench(CQ) rate. What's more, dual-SPI can improve radiation asymmetry apparently.

关键词： Analytical models Magnetohydrodynamics Codes Simulation Impurities Thermal quenching Numerical simulation

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Comparative Analysis of Bilateral Permanent Magnet Linear Synchronous Motors With Different Structures

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CES Transactions on Electrical Machines and Systems 2020年第2期4卷 142-150页

作者： Fengrui Cui Zhaolong Sun Wei Xu Weichang Zhou Yi Liu School of Naval University of Engineering Wuhan430000China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China

Permanent magnet linear synchronous motor(PMLSM)has the advantages of high thrust density and good control accuracy,which can be applied in high-power and high-speed *** this paper,the analytical models are established to obtain the electromagnetic performance for the PMLSMs with dual secondaries and dual *** air-gap flux density and the electromagnetic thrust are also obtained by the finite element model to verify theoretical ***,an improved structure is also put forward in order to suppress the thrust fluctuation of the ***,the advantages and disadvantages of two PMLSMs topologies are *** analyses would provide a guide for the design of PMLSMs applied in high-power and high-speed occasions.

关键词： Bilateral permanent magnet linear synchronous motor(BPMLSM) analytical method finite element algorithm(FEA) electromagnetic performance.

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Multiphoton Multidimensional Entanglement Based on Graph Theory

Multiphoton Multidimensional Entanglement Based on Graph The...

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Bao, Jueming Fu, Zhaorong Pramanik, Tanumoy Mao, Jun Chi, Yulin Cao, Yingkang Zhai, Chonghao Mao, Yifei Dai, Tianxiang Chen, Xiaojiong Jia, Xinyu Zhao, Leshi Zheng, Yun Yang, Yan Tang, Bo Li, Zhihua Luo, Jun Wang, Wenwu Peng, Yingying Liu, Dajian Dai, Daoxin He, Qiongyi Muthali, Alif Laila Oxenløwe, Leif K. Vigliar, Caterina Paesani, Stefano Hou, Huili Santagati, Raffaele Silverstone, Joshua W. Laing, Anthony Thompson, Mark G. O'Brien, Jeremy L. Ding, Yunhong Gong, Qihuang Wang, Jianwei State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing100871 China Institute of Microelectronics Chinese Academy of Sciences Beijing100029 China State Key Laboratory for Modern Optical Instrumentation College of Optical Science and Engineering Ningbo Research Institute International Research Center for Advanced Photonics Zhejiang University Hangzhou310058 China Department of Electrical and Photonics Engineering Technical University of Denmark Kgs. Lyngby2800 Denmark Niels Bohr Institute University of Copenhagen Blegdamsvej 17 CopenhagenDK-2100 Denmark Quantum Engineering Technology Labs H. H. Wills Physics Laboratory Department of Electrical and Electronic Engineering University of Bristol BristolBS8 1FD United Kingdom QuantumLab Boehringer Ingelheim Ingelheim am Rhein55218 Germany Department of Physics The University of Western Australia Perth6009 Australia

We demonstrate the capability of graph theory scheme to realize complex multiphoton multidimensional state. We show the generation of quantum states based on graph theory was realized by the reconfigurable integrated quantum chip. The 4-photon 3-dimensional GHZ state was generated and verified and manipulated for the first time. © Optica Publishing Group 2024

关键词： Quantum entanglement

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Torque Ripple Suppression Method for Switched Reluctance Motor Based on Current Adaptive Torque Sharing Function

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IEEE Transactions on Transportation Electrification 2025年

作者： Li, Zixin Wang, Shuanghong Zhou, Libing Gan, Chun Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

Considering the poor torque ripple suppression performance resulting from inefficient torque allocation in conventional offline torque sharing functions (TSFs), this paper proposes an online adaptive TSF based on deadbeat predictive control (DPC). First, the proposed method accounts for the current tracking capability by dynamically distributing the optimal current reference profiles for the incoming and outgoing phases. The rate of change of current (RCC) in the adjacent phases is also considered during the formulation of the TSF expression. Second, to accommodate various operating conditions, a control angle self-adjustment algorithm is proposed. The optimal turn-on angle is determined by minimizing torque ripple through an iterative calculation method. The optimal turn-off angle is identified by comparing the estimated value with the maximum flux linkage at the (k+1) control period. Compared to the optimal angle calculation strategies in the existing literature, the proposed method is not only computationally efficient but also mitigates the angle oscillation phenomenon during the iterative calculation process. Finally, simulation and experimental validation of the proposed method are conducted on a three-phase 12/8 switched reluctance motor (SRM). The results demonstrate that the proposed method offers superior torque ripple suppression and higher torque-per-ampere ratios across different operating conditions compared to the traditional torque control method. © 2025 IEEE.

关键词： Predictive control systems

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Multiphoton Multidimensional Entanglement Based on Graph Theory

Multiphoton Multidimensional Entanglement Based on Graph The...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

关键词： Quantum entanglement

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