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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Liu, Yaowen Sun, Haishun Xu, Suyue School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798331530174

Distributed photovoltaic (DPV), represented by household rooftop PV, has been developing rapidly under the promotion of county-wide rooftop PV policy in China. However, its large-scale integration has brought serious challenges to the reliability of the distribution network. It is of great significance to scientifically evaluate the hosting capacity of DPV and provide hosting capacity improvement strategies. By constructing distribution network operational reliability evaluation indexes, the maximum hosting capacity of DPV is evaluated by considering several factors, such as power flow, bus voltage, new energy consumption, etc. The DPV capacity is dispersed evenly to each distribution network bus, which more accurately simulates the dense distribution scenario of household PV and improves the accuracy of the hosting capacity results. A demand response (DR) model based on a two-layer game between load aggregators and distribution network operators is constructed, and the results of the calculation show that the maximum hosting capacity of DPV can be effectively improved based on guaranteeing the maximum interests of both parties. This research provides a scientific basis for the rational planning of the construction scale of DPV. © 2024 IEEE.

关键词： Photovoltaics

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A Fast Transient Current Control Strategy for Three-Phase Dual-Active Bridge Converter

A Fast Transient Current Control Strategy for Three-Phase Du...

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

作者： Zhao, Mengyuan Zhang, Yu School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Wuhan China

ISBN: (纸本)9798350380514

The three-phase dual-active bridge converter (3pDAB) is becoming a promising topology due to the advantages of higher power density and efficiency. Under phase-shift (PS) modulation, the phase-shift angle will have a significant step change when the transmission power is quickly adjusted, which will cause serious transient oscillation of the inductance current and pose a risk to the safety of the converter. Focusing on the widely utilized single phase-shift (SPS) modulation, this paper examines the transient process of 3pDAB resulting from variations in the phase-shift angle. Then, by temporarily adjusting the external phase-shift angle, a fast transient current control strategy (FTCC) is proposed to mitigate oscillations, effectively managing the transient process within one-third of a switching cycle and facilitating smooth transmission power adjustments. Furthermore, the impact and oscillation of inductance current during transient process are significantly reduced. Finally, the performance of the control strategy was verified. © 2024 IEEE.

关键词： electromagnetic transients

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Improving the reliability of classical molecular dynamics simulations in battery electrolyte design

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Journal of Energy Chemistry 2025年第2期101卷 34-41,I0002页

作者： Xin He Yujie Zhang Haomiao Li Min Zhou Wei Wang Ruxing Wang Kai Jiang Kangli Wang State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die&Mould Technology College of Materials Science and EngineeringHuazhong University of Science and Technology Wuhan 430074HubeiChina Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy Hubei University of TechnologyWuhan 430068HubeiChina

Explorations into new electrolytes have highlighted the critical impact of solvation structure on battery performance,Classical molecular dynamics(CMD)using semi-empirical force fields has become an essential tool for simulating solvation ***,mainstream force fields often lack accuracy in describing strong ion-solvent interactions,causing disparities between CMD simulations and experimental *** some empirical methods have been employed in some of the studies to address this issue,their effectiveness has been *** CMD research,supported by quantum chemical calculations and experimental data,reveals that the solvation structure is influenced not only by the charge model but also by the polarization *** empirical approaches that focused solely on adjusting ion-solvent interaction strengths overlooked the importance of polarization *** on this insight,we propose integrating the Drude polarization model into mainstream force fields and verify its feasibility in carbonate,ether,and nitrile *** experimental results demonstrate that this approach significantly enhances the accuracy of CMD-simulated solvation *** work is expected to provide a more reliable CMD method for electrolyte design,shielding researchers from the pitfalls of erroneous simulation outcomes.

关键词： Electrolyte Classical molecular dynamics Solvation structure Simulations

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Multi-Objective Optimization of electromagneticthermal Coupling Performance for High-torquedensity PMSM based on Multi-dimensional Correction Techniques

Multi-Objective Optimization of Electromagneticthermal Coupl...

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2024 International Conference on Electrical Machines, ICEM 2024

作者： Li, Zequan Wang, Jin Sun, Lu Kang, Haoyu Liu, Liyang Zhou, Libing State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Guangzhou China Guangzhou511453 China

ISBN: (纸本)9798350370607

To address the precision limitation of traditional thermal models and the computational inefficiency of electromagnetic-thermal coupling finite element models, this work proposes a multidimensional correction-based electromagnetic-thermal coupling design optimization method for electric machines. Firstly, this method corrects the sensitive parameters in the analytical lumped parameters thermal network model (LPNM) based on prior information from historical experimental data to ensure the accuracy for thermal performance analysis. Subsequently, to enhance computational efficiency, a large number of low-fidelity (LF) samples are obtained using the corrected thermal model in a serial electromagnetic-thermal field calculation manner, complemented by a small number of high-fidelity (HF) samples obtained from the electromagnetic-thermal coupling simulation model. Then, by employing a transfer learning technique, the data information from the low- to high-fidelity sample sets is comprehensively utilized to train a multi-fidelity (MF) surrogate model for the final optimization. The proposed method applied to a high-torque-density aerospace propulsion permanent magnet synchronous motor (PMSM) with short-term strong overload capability, it not only significantly improves the accuracy of LPNM, but also reduces the training sample acquisition time by over 50% under the same model accuracy. Finally, a prototype is tested to validate the effectiveness of the proposed method. © 2024 IEEE.

关键词： Lumped parameter networks

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Multi-scale regulation in S,N co-incorporated carbon encapsulated Fe-doped CO_(9)S_(8) achieving efficient water oxidation with low overpotential

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Nano Research 2022年第2期15卷 872-880页

作者： Wenbin Wang Yang Yang Yang Zhao Shuzhe Wang Xiaomeng Ai Jiakun Fang Youwen Liu State Key Laboratory of Materials Processing and Die&Mould Technology and School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Lab of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Sulfide compounds provide a type of promising alternative for oxygen evolution reaction(OER)electrocatalysts due to their diversity,intrinsic activities,low-price and ***,the unsmooth mass transport channel,the collapse of the structure and insufficient intrinsic activities limit their potential for OER *** respond,the dense Fe-doped Co_(9)S_(8) nanoparticles encapsulated by S,N co-incorporated carbon nanosheets(Fe-Co_(9)S_(8)@SNC)were proposed and synthesized via fast thermal treatment from ultrathin metal-organic frameworks(MOFs)*** designed catalysts,the nanosheet configuration connected by nanoparticles retained rich access for permeation of electrolyte and precipitation of O_(2) bubbles during OER ***,the outer carbon layer of Co9S8 provided additional catalytic activity while acting as armor to keep the structure *** the atomic scale,the doped Fe regulated the local charge density and the d-band center for facilitating desorption of oxygen *** from this multi-scale regulation strategy,the Fe-Co_(9)S_(8)@SNC displays an ultralow overpotential of 273 mV at 10 mA·cm^(-2) and small Tafel slope of 55.8 mV·dec^(-1),which is even close to the benchmark RuO_(2) *** concept could provide valuable insights into the design of other catalysts for OER and beyond.

关键词： Co9S8 water oxidation electronic structure multi-scale regulation d-band center

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A Double Gaussian Denoising Method for Beam Profiling in Proton Therapy 4

A Double Gaussian Denoising Method for Beam Profiling in Pro...

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4th International Conference on Electronic Information engineering and Computer technology, EIECT 2024

作者： Xiong, Haimin Tan, Ping Chen, Songbin Qian, Zhihong Tang, Dan School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331528850

The beam position and size are critical for the safety of the proton therapy system. In view of the distortion of data collected by the ionization chamber during radiating, the possible physical process of noise generation is analyzed and a denoising method based on double Gaussian fitting is proposed for beam profiling in this paper. To investigate the effect of air scattering on the distortion of measured data, we performed the simulation analysis of the process after the proton beam enters the ionization chamber using Garfield++. It was found that the double Gaussian denoising method has obvious advantages over the simple single Gaussian fitting. © 2024 IEEE.

关键词： Ionization chambers

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Magnet and Tracking Analysis of Quadrupole Scanning Method for Emittance Measurement

Magnet and Tracking Analysis of Quadrupole Scanning Method f...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Zeng, Yifeng Wang, Yan Hu, Hao Lu, Di Liu, Kaifeng Hu, Tongning School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

Since transverse emittance serves as a critical parameter for evaluating the performance of an electron-beam injector, accurate emittance measurement directly affects the engineering realization of not only the injector but also the entire accelerator-based facility involved. Based on the typical beam injector developed at Huazhong University of Science and technology (HUST injector), the quadrupole magnet scanning (Q-scanning) method is employed for emittance measurement. Suitable selections are made for the existing devices within the beamline, which reduce the measurement errors associated with emittance. An analysis is conducted on the selected quadrupole magnets (Q-magnets), along with an examination of the impact of fringe fields on emittance measurements, including the effects of different edge field conditions and the direct representation of fringe fields in the transfer matrix. The analysis results clearly demonstrate the importance of device selection in the Q-scanning method and the direct effects of fringe fields on various aspects. © 2024 IEEE.

关键词： Accelerator magnets

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Study on the Influence of Control Grid on the Emission Characteristics of Cathode Assembly

Study on the Influence of Control Grid on the Emission Chara...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Xiong, Mianzhi Zhou, Zijian Huang, Jiang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

Low-energy electron curtain accelerators are widely used in the field of radiation processing. In this paper, the model of the cathode emission assembly of the multi-filament electron curtain accelerator is established by CST simulation software, and the influence of the duty ratio and grid width of the semi-cylindrical control grid on the current emission characteristics of the cathode assembly is explored. It is found that the larger the duty ratio of the control grid and the wider the mesh grid width, the emission current and the current drawn at control grid increase. Especially when the width of mesh grid reaches 3mm, the current emission characteristics of the cathode assembly no longer conform to the three-half law. The research work in this paper has reference significance for the construction and design of cathode assembly. © 2024 IEEE.

关键词： Field emission cathodes

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Signature Identification of False Data Injection Attacks Based on Deep Vision Networks

Signature Identification of False Data Injection Attacks Bas...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： He, Yixuan Wang, Jingyu Shi, Dongyuan School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

The increasing integration of cyber-physical systems has markedly amplified the vulnerability of power systems to False Data Injection Attacks (FDIAs), posing significant threats to their security and reliability. FDIAs can emulate various power system dynamics, each with distinct objectives, potentially leading to incorrect decisions by operators or causing damage that may go undetected initially. The impact of these attacks often hinges on their specific signatures, which reflect the temporal characteristics of the injected data waveforms. Therefore, precise classification of these attack signatures is essential for predicting their potential effects and devising effective countermeasures. This paper addresses this challenge by proposing the use of the VGG16 network, a deep learning model commonly utilized in computer vision, to classify the attack signatures. Leveraging VGG16's ability to identify complex patterns in data, the pro-posed method offers a robust solution for distinguishing between different types of FDIAs. Experimental validation on the IEEE 39-bus system confirms the effectiveness of this approach in improving the detection and classification of FDIAs. © 2024 IEEE.

关键词： Cyber attacks

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Dynamic Analysis of No-Insulation Insert Magnet Under Changing Background Magnetic Field

Dynamic Analysis of No-Insulation Insert Magnet Under Changi...

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

作者： Duan, Pu Ren, Li Xu, Ying Shi, Jing Tang, Yuejin Li, Jingdong School of Electrical and Electronic Engineering The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350301571

Due to the excellent thermal stability and high-power density in steady state, no-insulation (NI) winding technology is widely used in the application of superconducting magnets. However, current ripple and background magnetic field fluctuations caused by relative devices result in repetitive turn-to-turn current of the NI insert magnet, which will impose a great impact on the thermal stability of the NI magnet. This paper analyzes the cylindrical and radial current distributions of NI magnet under dynamic operating conditions by 2D finite-element method. The results provide references of thermal conductive structure design and assessment of operational reliability of NI magnets in changing working conditions. © 2023 IEEE.

关键词： current distribution dynamic analysis electric field finite element NI magnet

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