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2021 International Conference on Mechatronics, Automation and Intelligent Control, MAIC 2021

作者： Shuai, Kang Li, Zequan Zhou, Libing Wang, Jin State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China

This paper presents an optimized design method of PMASynRM based on the RBF neural network. Firstly, Sobol sensitivity analysis method is used to analyze the mutual influence of the parameter variables of the motor. Then, in order to establish the surrogate model of the finite element model, the samples are obtained by the Latin hypercube sampling method to train the RBF neural network, and the NSGA-? algorithm is used for multi-objective optimization based on the trained RBF neural network. Finally, the optimization scheme is verified by the results of finite element analysis that the proposed method can provide an optimal design. © Published under licence by IOP Publishing Ltd.

关键词： Multiobjective optimization

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Analytical Model for Magnetic Field of Toroidal D-Shaped HTS Magnet

Analytical Model for Magnetic Field of Toroidal D-Shaped HTS...

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2023 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2023

作者： Song, Meng Li, Li Qiu, Yifeng Ren, Li Xu, Ying China Southern Power Grid Company Ltd Joint Laboratory on Power Superconducting Technology Guangzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350301571

The electromagnetic computation complexity of large-scale three-dimensional superconducting magnets is extremely high, posing significant challenges for optimizing their design. In this paper, an analytical model for the magnetic field of toroidal D-shaped high-temperature superconducting (HTS) magnets is developed based on the assumptions of uniform current distribution and the vector potential's Poisson equation. A comparison with results obtained using the H-formulation reveals that the assumption of uniform current distribution introduces acceptable errors in the magnetic field. To expedite calculations while maintaining precision, the discrete integration method is adopted, providing computation speeds that are two to three orders of magnitude faster than the finite element method (FEM). This model can be applied for calculating parameters such as center magnetic field and critical current, thereby enhancing the efficiency of electromagnetic design for superconducting magnets. © 2023 IEEE.

关键词： HTS magnets magnetic field calculation toroidal D-shaped magnets

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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...

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Energy Storage and Conversion (ISESC), CPSS & IEEE International Symposium on

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

ISBN: (数字)9798350380514

ISBN: (纸本)9798350380521

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.

关键词： Resistors Power control Resonant frequency Power system stability Stability analysis Mathematical models Resonance Voltage control Grid forming Voltage-source converters

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Quasi-static magnetic compression of field-reversed configuration plasma:amended scalings and limits from two-dimensional MHD equilibrium

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Plasma Science and technology 2023年第2期25卷 58-67页

作者： Abba Alhaji BALA 朱平李浩龙丁永华刘家兴万遂何莹李达王能超饶波王之江 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China School of Physics Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Department of Physics Federal University DutseJigawa 720101Nigeria Department of Engineering Physics University of Wisconsin-MadisonMadisonWisconsin WI-53706 United States of America College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060People's Republic of China

In this work,several key scaling laws of the quasi-static magnetic compression of field reversed configuration(FRC)plasma(Spencer et al 1983 *** 261564)are amended from a series of two-dimensional FRC MHD equilibriums numerically obtained using the Grad–Shafranov equation solver *** on the new scaling for the elongation and the magnetic fields at the separatrix and the wall,the empirically stable limits for the compression ratio,the fusion gain,and the neutron yield are evaluated,which may serve as a more accurate estimate for the upper ceiling of performance from the magnetic compression of FRC plasma as a potential fusion energy as well as neutron source devices.

关键词： magneto-hydrodynamic equilibrium Grad-Shafranov equation field reversed configuration NIMEQ magnetic compression

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AC Loss Evaluation of a Toroidal D-Shaped 10 MJ Superconducting Magnet

AC Loss Evaluation of a Toroidal D-Shaped 10 MJ Superconduct...

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2023 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2023

作者： Li, Li Song, Meng Long, Feiyang Xu, Ying Ren, Li China Southern Power Grid Company Ltd Joint Laboratory on Power Superconducting Technology Guangzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350301571

A 10 MJ HTS SMES designed for power system voltage compensation and active-reactive power regulation applications is under construction. The system aims to complete 10MJ charging or discharging in 2s time, so it is crucial to analyze its AC losses. In this paper, the AC loss of the magnet is analyzed by the dimensional reduction inversion method, and the AC loss of the magnet for one complete working cycle is obtained to be about 72 KJ, which provides a reference for the design of the cooling system of SMES. © 2023 IEEE.

关键词： AC loss HTS magnet toroid

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An ISGW Filtering Antenna with Spurious Modes and Surface Wave Suppression for Millimeter Wave Communications

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China Communications 2023年第11期20卷 1-12页

作者： Lihui Wang Dongya Shen Qiuhua Lin Zhiyong Luo Wenjian Wang Jianpei Chen Zhao Gao Wei Zhang School of Electronics and Communication Engineering Sun Yat-sen UniversityShenzhen 518107China School of Information Science and Engineering Yunnan UniversityKunming 650091China Kuang-Chi Institute of Advanced Technology&State Key Laboratory of Meta-RF Electromagnetic Modulation Technology ShenzhenChina School of Electrics and Information Engineering Yunnan Minzu UniversityKunmingChina Institute of Telecommunication and Navigation Satellites China Academy of Space TechnologyBeijing 100094

In this paper,an integrated substrate gap waveguide(ISGW)filtering antenna is proposed at millimeter wave band,whose surface wave and spurious modes are simultaneously suppressed.A secondorder filtering response is obtained through a coupling feeding scheme using one uniform impedance resonator(UIR)and two stepped-impedance resonators(SIRs).To increase the stopband width of the antenna,the spurious modes are suppressed by selecting the appropriate sizes of the ISGW unit ***,the ISGW is implemented to improve the radiation performance of the antenna by alleviating the propagation of surface *** an equivalent circuit is investigated to reveal the working principle of *** demonstrate this methodology,an ISGW filtering antenna operating at a center frequency of 25 GHz is designed,fabricated,and *** results show that the antenna achieves a stopband width of 1.6f0(center frequency),an out-of-band suppression level of 21 dB,and a peak realized gain of 8.5 dBi.

关键词： filtering antenna integrated substrate gap waveguide millimeter wave communications spurious modes suppression surface wave suppression

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Design of Pulse Power Supply for Nonlinear Kicker of Synchrotron Radiation Light Source 4

Design of Pulse Power Supply for Nonlinear Kicker of Synchro...

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4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Zhu, Bing She, Jiahao Liu, Yuan Wang, Xulong Li, Xiaofei Yang, Jun Fan, Kuanjun Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China China Electric Power Research Institute Wuhan430074 China

ISBN: (纸本)9798350305562

Synchrotron radiation light source has evolved into the fourth generation of diffraction-limited storage ring sources. Off-axis injection is a common approach at many leading international light sources, with the core element being Nonlinear Kicker (NLK). The pulse power supply is a critical component for ensuring the proper operation of NLK. This paper focuses on the design of pulse power supplies for NLK used in synchrotron light sources, using the off-axis injection NLK at the 1.5 GeV low-energy ring of Wuhan Light Source as a case study. The study employs Matlab/Simulink simulation to analyze the impact of various parameters on the output current of pulse power supply. The outcome of this study culminated in the design of a pulse power supply featuring a pulse current amplitude of 5440 A and a pulse width of 1 μs. © 2023 IEEE.

关键词： Light sources

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Temperature Optimization for Efficient Power-to-Hydrogen Water Electrolysis

Temperature Optimization for Efficient Power-to-Hydrogen Wat...

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2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Chen, Ke Hu, Kewei Yang, Jie Chen, Feng Fang, Jiakun State Grid Hubei Electric Power Company Limited Economic Research Institute Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798350322699

This paper proposes an optimization model for temperature of water electrolyzers in pursuit of maximum power-to-hydrogen efficiency. Unlike the traditional operating strategy which controls constant temperature, the model aims at obtaining optimal temperature according to the variation of supplied current. In order to realize the maximum efficiency, the temperature-dependent electrochemical model of the electrolyzer, as well as the thermal model of the heater, is established. The optimal temperature occurs where the electrochemical loss and the thermal loss meet the balance. From the simulation results, the proposed model can acquire optimal temperature based on the supplied current, which can be applied to the scene of fluctuating power supply, e.g. wind and solar power. The test results show that up to 15% efficiency improvement can be achieved with the proposed temperature control method, compared with the traditional constant temperature control. © 2023 IEEE.

关键词： fluctuating power supply power-to-hydrogen efficiency temperature optimization water electrolyzers wind and solar power

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Junction Temperature Estimation Method for Press-pack IGBTs Using Double-side Thermal Resistance Network Model

Junction Temperature Estimation Method for Press-pack IGBTs ...

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

作者： Tu, Liuyu Liang, Lin Wang, Li Zhang, Ziyang Zhang, Zhiyuan Wen, Kaijun School of Electrical and Electronic Engineering Engineering Research Center of Power Safety and Efficiency State Key Laboratory of Advanced Electromagnetic Technology Ministry of Education of China Huazhong University of Science and Technology Wuhan China CTG Jiangsu Energy Investment Co. Ltd Nanjing China

ISBN: (纸本)9798350380514

Due to the asymmetry of the double-side structure of press-pack insulated-gate bipolar transistors (PP IGBTs), the physical significance and calculation method of parameters in the thermal resistance network model are not clear, which brings some challenges to the junction temperature (Tj) estimation method using this model. In this paper, two kinds of double-side thermal resistance network physical models are proposed by calculating the heat flow ratio on both sides and taking the temperature of the top and bottom case as the reference isothermal point. In the single chip packaging and double-side water cooling conditions, the simulation results show that the maximum relative error of the junction temperature estimation of two kinds of models established and the traditional model is -0.13%, 1.21% and -1.42%, respectively. The experiment also verifies that the proposed model has the highest accuracy and a certain range of application for the junction temperature estimation of PP IGBTs. © 2024 IEEE.

关键词： Insulated gate bipolar transistors (IGBT)

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Multiphysics Modeling and Parameter Analysis of Industrial Power-to-Hydrogen Electrolyzers 6

Multiphysics Modeling and Parameter Analysis of Industrial P...

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6th International Conference on Energy, Electrical and Power engineering, CEEPE 2023

作者： Chen, Ke Hu, Kewei Yang, Jie Chen, Feng Zhong, Zhiyao Fang, Jiakun State Grid Hubei Electric Power Company Limited Economic Research Institute Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350348279

This paper proposes the multiphysics model of the industrial power-to-hydrogen electrolyzers. Based on the multi-energy flow in the industrial power-to-hydrogen electrolysis plant, the coupling among the multiphysics in the electrolyzer, including the electrochemical reaction, the flow field, the mass transfer and the temperature field, are unveiled. The governing equations and coupling mechanisms of the physical fields are introduced in detail, which are further illustrated according to the simulation results in COMSOL Multiphysics. Furthermore, several critical parameters, including the cell voltage, temperature and the concentration of the electrolyte, are analyzed based on the proposed model. Through the analysis on the current density- voltage characteristics, it can be concluded that the operating of the industrial electrolyzer usually faces the trade-off between the hydrogen production rate and the efficiency. The proposed model provides multiphysics explanations on the industrial statistics of the electrolyzer. © 2023 IEEE.

关键词： Multiphysics

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