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2024 3rd International Youth Scientist Forum - Academic Symposium on New Energy and New Material, IYSF-NENM 2024

作者： Han, Qigao Wang, Fuhe Wang, Fengqian Ji, Shuaijing Zhong, Jun Du, Jinqiao Tian, Jie Zhang, Weixin Tang, Shun Cao, Yuancheng Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Shenzhen Power Supply Co. Ltd. Shenzhen518001 China

Li7La3Zr2O12 composite solid-state electrolytes (LLZO CSSEs) face severe application challenges due to the effect of grain boundary impedance. For this reason, the ionic conduction blocking effect caused by the polymer is mitigated by a dry process while reducing the polymer content. When paired with the designed fluorinated electrolyte, the ionic conductivity of the LLZO CSSEs reach 1.52 mS cm-1, exhibiting a significant ionic conduction synergistic effect. The wide electrochemical stabilization window and better flame retardancy can guarantee the stable application of LLZO CSSEs in lithium-metal batteries, and the lithium symmetric batteries can be stably cycled more than 1000 hours under the current density of 1 mA cm-2. The Li|LiNi0.8Co0.1Mn0.1O2 solid-state batteries achieved a better rate performance with the specific capacity of 128.50 mAh g-1 under the current of 5 C. These results indicate that LLZO CCSEs have the potential for further applications and are contributed to the development of lithium-metal batteries. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Solid-State Batteries

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Study on Double Feedforward Control Strategy for Three-Level Buck-Boost Bi-Directional Converter Applied in Energy-Storage Inverters 11th

Study on Double Feedforward Control Strategy for Three-Level...

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11th Frontier Academic Forum of Electrical engineering, FAFEE 2024

作者： Zhou, Chijun Fang, Yu Chen, Jie Li, Rui Shu, Kaixin Wang, Xuehua College of Information Engineering Yang Zhou University Yang Zhou China College of Electrical Energy and Power Engineering Yang Zhou University Yang Zhou China The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9789819788156

This paper focuses on the three-level Buck-Boost Bi-directional converter (TL Buck-Boost BDC) applied in energy-storage inverters serving as charging or discharging circuit for storage battery. Based on the traditional dual closed-loop control method, a dual feedforward control strategy based on the balanced duty cycle signal at the midpoint of the direct current bus (DC Bus) and the battery voltage duty cycle signal is proposed. The balanced duty cycle signal at the midpoint of the DC Bus is generated by the balanced feedforward generator, and the battery voltage duty cycle signal is generated by the battery voltage feedforward generator. These two duty cycle signals are superimposed with the duty cycle signal generated by the dual closed-loop control to construct the duty cycle signal used to control the switching on or off of the switches in the TL Buck-Boost BDC, thereby achieving stable control of the charging or discharging operation in the energy-storage inverter while ensuring the DC-Bus voltage, Realized DC-Bus midpoint balance and improving the dynamic response speed of the system. The control parameters of the TL Buck-Boost BDC is designed, and the correctness and reliability of the method studied in this paper is verified by experimental results. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Buck converter

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A Novel High Torque Density Spoke-Array Permanent Magnets Vernier Machine with Magnets Bridge

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IEEE Transactions on Industry Applications 2025年

作者： Zhang, Yuwei Zhao, Yu Li, Dawei Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

In recent years, permanent magnet vernier machine (PMVM) has drawn more attention due to their high torque density. To further improve torque capability, Spoke-array (SA) PM having better flux focusing effect are applied. However, SAPMVM suffers from a considerable torque reduction due to the deteriorated low order working flux harmonics caused by flux barrier effect. Especially, the higher pole ratio (PR), i.e., the ratio of PM pole-pair to armature pole-pair, the severer torque drop of SAPMVM. In this paper, a novel SAPMVM is proposed, where the magnets bridge is introduced, which can effectively restrict the flux barrier effect. As a result, both the working flux harmonics and torque density of SAPMVM are enhanced. To analyze the operating principle of proposed SAPMVM with magnets bridge, an equivalent magnet circuit model is established. Moreover, the electromagnetic performances of the proposed SAPMVM are compared with regular SAPMVM by FEA, where the torque of proposed SAPMVM has increased by 43.3% and 175.6% under rated-load when the PR is selected as 5 and 11. © 1972-2012 IEEE.

关键词： Permanent magnets

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Dual-Polarized Reconfigurable Reflectarray Using Vanadium Dioxide for 5G mmWave Communication

Dual-Polarized Reconfigurable Reflectarray Using Vanadium Di...

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2025 IEEE International Workshop on Antenna technology, iWAT 2025

作者： Disharoon, Walter Dasari, Sree Adinarayana Williamson, Thomas G. Kovitz, Joshua Ghalichechian, Nima Electrical and Computer Engineering Georgia Institute of Technology Atlanta United States Georgia Tech Research Institute Sensors and Electromagnetic Applications Laboratory Atlanta United States Georgia Tech Research Institute Advanced Concepts Laboratory Atlanta United States

ISBN: (纸本)9798331527365

A vanadium dioxide (VO2) reconfigurable reflectarray was designed and simulated for operation between 28-32 GHz. VO2 is an insulator-metal-transition phase-change material that exhibits a sharp, reversible conductivity change at 68 °C. The design is dual-polarized to support LP, dual-LP, or dual-CP applications. The simulated reflection loss is less than 1 dB over the entire band. The phase difference is 180 ± 20° between 28-33 GHz. The simulated realized gain of the finite array peaks at 22.9 dBi, which corresponds to an aperture efficiency of 29%. The 3-dB Gain bandwidth covers 27.7-33.2 GHz, which is an 18% bandwidth. Ongoing fabrication and measurement results will be presented at the conference. © 2025 IEEE.

关键词： Reflection

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Special issue on progress of real-time confocal microscopy study on steelmaking and phase transformation in metallic materials

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Journal of Iron and Steel Research International 2025年第2期32卷 313-314页

作者： Wangzhong Mu Ying Ren Tong-sheng Zhang Deepoo Kumar Susanne Michelic Bryan Webler Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing 100083China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Department of Metallurgical Engineering and Materials Science IIT BombayPowaiMumbaiIndia Christian Doppler Laboratory for Inclusion Metallurgy in Advanced Steelmaking Montanuniversitaet LeobenLeoben 8700Austria Department of Materials Science and Engineering Carnegie Mellon UniversityPittsburgh 15213PAUSA

High-temperature confocal laser scanning microscopy(HT-CLSM)is a robust characterization tool which can provide in situ real-time studies of materials *** facility has been applied in investigating interfacial phenomena in ironmaking and steelmaking as well as phase transformations during heat treatment of metallic *** pioneering work on the application of HTCLSM dates back to twenty-five years ago,to directly observe the crystallization of undercooled steel melt.

关键词： transformation materials steel

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Regional Short-Term Wind Power Prediction Based on CEEMDAN-FTC Feature Mapping and EC-TCN-BiLSTM Deep Learning

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Wind Energy 2025年第6期28卷

作者： Qin, Guoyuan Peng, Xiaosheng Yang, Zimin State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

Regional-scale holistic wind power prediction (WPP) is pivotal to securing the safety, stability, and economic efficiency of power systems. To improve the accuracy of regional short-term WPP, a method based on complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN), fine-to-coarse (FTC) feature mapping, and error compensation-temporal convolutional network-bidirectional Long short-term memory network (EC-TCN-BiLSTM) is proposed in this paper. First, the regional input features, encompassing data from numerous wind farms, are decomposed using the CEEMDAN algorithm to extract intrinsic mode functions (IMFs) and residuals at different time scales. Second, the decomposed IMFs and residuals are reconstructed using the adaptive FTC feature mapping technique, forming a high-dimensional feature set in the time-frequency domain, which boasts fewer features than the original set, thus diminishing the computational intricacy of the prediction model. Third, by combining the strengths of TCN and BiLSTM neural networks, the temporal and spatial correlations of input features can be captured effectively. Fourth, the integration of the EC module corrects the systematic errors of the prediction results, thereby further improving the prediction accuracy. Finally, case studies elucidate the efficacy of the proposed WPP method, illustrating a 0.41%–2.4% diminution in 24-h-ahead root mean square error (RMSE) and a 0.68%–2.63% reduction in 96-h-ahead RMSE relative to conventional methodologies. © 2025 The Author(s). Wind Energy published by John Wiley & Sons Ltd.

关键词： Convolutional neural networks

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Dielectric Mechanism and Spectrum Prediction Model for Insulating Paper Based on Three-Dimensional Frequency-Domain Spectroscopy

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IEEE Transactions on Dielectrics and Electrical Insulation 2025年

作者： Liu, Ruiqi Wang, Shengkang Lin, Fuchang Li, Hua Ministry of Education State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

Moisture is a serious concern for transformers, as it will degrade insulation properties and accelerate aging. The dielectric mechanisms of oil-immersed paper (OIP) and the influence of moisture still remains contentious in existing studies, which prevents the application of Frequency-Domain Spectroscopy (FDS) technology in moisture assessment of transformers. OIP is a biphasic composite material composed of oil and paper, and the existence of oil would complicate the understanding of the dielectric mechanisms in solid insulation. Therefore, this study focuses on investigating the dielectric properties of non-immersed insulating paper using FDS. Firstly, the spectra of paper with different moisture content were analyzed, and the relationship between dielectric parameters and moisture was quantified through the proposed dielectric model of insulating paper. Then, a three-dimensional dielectric model for spectrum prediction was established, and the feasibility and universality of model was verified. Results show three distinct dielectric response processes in insulating papers: the hopping conduction (RI), the low-frequency relaxation polarization (RII), and the high-frequency relaxation polarization (RIII). With increasing moisture content, RI and RII processes shift synchronously and exponentially towards higher frequencies with the dielectric curve shape maintained, while RIII process is unaffected. Moreover, the proposed spectrum prediction model can accurately predict the spectrum of insulating paper with varying moisture content. The dielectric response mechanism and three-dimensional dielectric model of insulating paper identified in this study provide the theoretical basis and data support for subsequent studies of the dielectric mechanism and moisture assessment of oil-immersed paper. © 1994-2012 IEEE.

关键词： Frequency domain analysis

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Divertor heat flux challenge and mitigation in the EHL-2 spherical torus

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Plasma Science and technology 2025年第2期27卷 97-109页

作者： Fuqiong WANG Xiang GU Jiankun HUA Yumin WANG Xiaokun BO Bo CHEN Yuejiang SHI Shuai XU Erhui WANG Yunfeng LIANG the EHL-2 Team College of Physics Donghua UniversityShanghai 201620People’s Republic of China Hebei Key Laboratory of Compact Fusion Langfang 065001People’s Republic of China ENN Science and Technology Development Co. Ltd.Langfang 065001People’s Republic of China 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 Forschungszentrum Jülich GmbH Institute of Fusion Energy and Nuclear Waste Management-Plasma PhysicsJülich 52425Germany

The divertor design is critical to heat load handling and thus to achievements of highperformance plasma operations in the EHL-2(ENN He-Long 2)*** paper presents the design of an X-point target(XPT)divertor,featuring a conventional inner divertor and an XPT outer divertor,aimed at the effective control of heat loads,which may be extremely high during high ion temperature *** divertor target plates are made from carbon-based materials,which can handle heat loads of up to 5 MW/m².Divertor performances,including the heat load controllability,the onset of detachment and the in-out/up-down asymmetry,etc.,are evaluated using both the simple particle-tracking strategy and the complicated SOLPS-ITER *** attention is paid to the drift effects on particle/heat transport in the divertor/scrape-off layer region and on the divertor heat loads,focusing on the semi-detached/detached operation *** from SOLPS-ITER simulations demonstrated that the currently designed magnetic equilibrium and divertor configuration can effectively handle the power heat load in EHL-2.

关键词： heat flux divertor EHL-2

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Inherent Switching Reallocated CPS-PWM with Improved Voltage Balancing for MMC

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IEEE Transactions on Power Electronics 2025年

作者： Peng, Li Ying, Yuxuan Wang, Zhen Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

Modular multilevel converter is an attractive solution in medium or high voltage applications, and voltage balancing is one of the most significant technical problems especially for CPS-PWM based MMCs. To solve this problem, in this paper, an inherent switching reallocated CPS-PWM is proposed for MMC. Based on arm current directions, switching states of sub-modules (SMs), voltage sorting and carrier sorting results, proposed method divides SMs and carriers into inserting and bypassing groups for each, enabling switching reallocation within these four co-optimized groups to inherently balance capacitor voltages. This effectively prevents additional switchings. Besides, most computations of the proposed CPS-PWM are logical operations implemented in FPGA, so proposed method can achieve reallocation frequency equal to sampling frequency. Unlike other CPS-PWM based methods for voltage balancing, the inherent switching reallocated CPS-PWM not only has superior converge speed in dynamic processes which accommodate a wide power range, but also has excellent balancing accuracy especially considering capacitance differences. Owing to appropriate reallocation principles, the proposed CPS-PWM has lower switching loss compared to existing carrier reallocation methods. Finally, the feasibility and superiority of the proposed method are validated by simulation and experiment results. © 1986-2012 IEEE.

关键词： Compressed sensing

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Research on Simulation Model and Test of Rail Temperature in electromagnetic Launch

Research on Simulation Model and Test of Rail Temperature in...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Xu, Rong Wang, Jiong Li, Tao Ye, Wenyi Cheng, Wenping Yan, Ping Xu, Weidong Institute Electrical Engineering Chinese Academy of Sciences Beijing100190 China Key Laboratory of Power Electronics and Electric Drives Chinese Academy of Sciences Beijing100190 China Key Laboratory of High Density Electromagnetic Power and Systems Chinese Academy of Sciences Beijing100190 China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan250104 China

ISBN: (纸本)9789819620791

The temperature of the rail is increasing in a short period of time by the Joule heat generated by the high current passing the contact surface between the rail and the armature, the frictional heat generated by the armature’s movement on the rail surface during the electromagnetic launching process. The launch performance is affected by the surface temperature of the track sharply increases and a decrease in the mechanical performance of the rail. The rail temperature simulation model and tests of the model is established by launch experiments. The model is modified and improved to provide support for the optimization design of thermal management system. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Launching

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