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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Chen, Jinqiao Wang, Shuang Shang, Huidong Peng, Tao Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

In this paper, the operation principles and basic properties of the axial permanent magnet hysteresis damper (APHD) are introduced. First, the double-side APHD (DSAPHD) is taken as an example to analyze the magnetic flux distribution in the stators and the rotor. According to the magnetic flux distribution in the rotor, a finite element (FE) model is established to calculate the minimum and maximum torque of DSAPHD, which has a faster calculation speed. A hybrid method of particle swarm optimization (PSO) and Hook-Jeeves direct search algorithm is used to design and optimize the DSAPHD. This reduces the influence of design experience, resulting in optimal design parameters. The optimized result has a smaller minimum torque while meeting the required maximum torque. Compared with the calculation results of the vector hysteresis model, the simplified FE model has higher calculation accuracy, which can be used in the design of APHD. © 2022 IEEE.

关键词： Hysteresis

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Transmission expansion planning considering customer interests for wind power integration in electricity power market 2

Transmission expansion planning considering customer interes...

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2nd International Conference on Smart Grids and Energy Systems, SGES 2023

作者： Chen, Zhongfei Song, Hui Bai, Yang Cai, Qiuna Zhao, Yue Nie, Zhicong Jin, Tianyu Guangdong Power Grid Co. Ltd China Southern Power Grid Co. Ltd Power Dispatch and Control Center Guangzhou510000 China 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)9798350371659

The high penetration of variable renewable energy sources (RES) in the power system poses substantial risks to the operation of the electricity power market. How to ensure the stability and economy of power market operation while consuming RES is a great challenge for transmission expansion planning (TEP). In this paper, we propose a price signal-based planning model that takes into account the interests of the customer side, which can promote the consumption of RES, effectively cope with the price fluctuations caused by the volatility of RES, suppress the price spikes and reduce the price risks of the customer side. © 2023 IEEE.

关键词： Power markets

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Research on electron evolution of atmospheric pressure pulsed dielectric barrier discharge based on two-dimensional symmetrical fluid model

Research on electron evolution of atmospheric pressure pulse...

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2021 International Conference on Electrical engineering and Computer technology, ICEECT 2021

作者： Chen, Xingyu Lu, Chen Xiong, Zilan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei WuHan430074 China

In recent years, plasma technology under atmospheric pressure has been widely used, and it is urgent to study the mechanism of plasma microcosmic particles. With the development of computer technology, it may be a promising method to describe the microcosmic discharge process by simulation. In this study, a two-dimensional symmetrical fluid model of ns pulse dielectric barrier discharge (DBD) at atmospheric pressure was constructed using COMSOL software. The movement behavior of electrons in different working gas, different gap distance and different electrode radius was analyzed. It was found that in helium, the electrons would move to the outside electrode area with low electron density obviously. In argon, the electrons would always be mainly constrained within the electrode area, and the electron density is more than 105 times than that of the initial value. Changing the gap distance will change the diffusion rate and maximum density of electrons. The electron distribution will be more homogeneous, and the density within the electrode area will increase 102-103 times at large gap distance. Changing the electrode diameter has little impact on electron movement behavior. The validity of the model is verified by comparing experimental and simulated voltage and current waveforms. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Atmospheric pressure

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Viscous effects on plasmoid formation from nonlinear resistive tearing growth in a Harris sheet

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Plasma Science and technology 2022年第1期24卷 18-29页

作者： Nisar AHMAD Ping ZHU Ahmad ALI Shiyong ZENG CAS Key Laboratory of Geospace Environment and Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026People'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 Department of Engineering Physics University of Wisconsin-MadisonMadisonWisconsin 53706United States of America Pakistan Tokamak Plasma Research Institute Islamabad 44000Pakistan Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026People’s Republic of China

In this work,the evolution of a highly unstable m=1 resistive tearing mode,leading to plasmoid formation in a Harris sheet,is studied in the framework of full MHD model using the Non-Ideal Magnetohydrodynamics with Rotation,Open Discussion *** the initial nonlinear growth of the primary m=1 island,the X-point develops into a secondary elongated current sheet that eventually breaks into *** distinctive viscous regimes are found for the plasmoid formation and *** the low viscosity regime(i.e.P_(r)■1),the plasmoid width increases sharply with viscosity,whereas in the viscosity dominant regime(i.e.P_(r)■1),the plasmoid size gradually decreases with *** a finding quantifies the role of viscosity in modulating the plasmoid formation process through its effects on the plasma flow and the reconnection itself.

关键词： viscosity reconnection plasmoids Prandtl number

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Hourly-Level Analytical Maintenance Optimization for Large-Scale Offshore Wind Farms: Case Study for Planned Projects in Guangdong

SSRN

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SSRN 2023年

作者： Han, Jingzuo Guo, Xinyang Chen, Xinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

Deployment of offshore wind power is growing from around 6 GW in 2019 towards over 200 GW in 2030 in China. Number of wind turbines in an offshore wind project is increasing from 165 in the largest project worldwide in 2022 towards over 1400 in Guangdong, China in 2030. Maintenance, which accounts for 33% of the life-cycle expenses, is primarily subject to ambient restrictions. With the increased turbine number in large-scale offshore wind farms, their availability will be further reduced. Optimizing the size and mix of maintenance fleets presents a significant opportunity to improve the availability of large-scale offshore wind farms. However, rigorous quantitative analyses of its effectiveness based on real-world project data are lacking. Additionally, suitable models for the maintenance optimization of large-scale offshore wind farms are also scarce, since existing models have overlooked turbine-level deviation and hourly-level variation, which usually leads to inevitable simplification errors. Here, an hourly-level analytical maintenance optimization model targeted at the large number of wind turbines is proposed to optimize maintenance performance. The model optimizes hourly maintenance decisions for each turbine and vessel individually, distinguishing their individual locations and states. The model is applied to evaluate potential benefits from maintenance fleet transformations in Eastern Guangdong, where about 5500 turbines are planned to be in operation by 2030. The effectiveness of enlarged fleet size, accelerated vessel cruise speed, expanded vessel capacity and enhanced vessel wave height resistance is analyzed. Our study reveals that coordinated improvement in vessel wave height resistance and vessel capacity by only 0.5m and 25%, respectively, could elevate large-scale offshore wind farm availability by over 30%. In contrast, enlarging the vessel fleet size by over 133% and increasing the vessel cruise speed by almost 82% could only raise it by around

关键词： Offshore wind farms

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Model and Control of Integrated Six-switch Buck-Boost and CLLLC Cascaded Converter

Model and Control of Integrated Six-switch Buck-Boost and CL...

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PELS Students and Young Professionals Symposium (SYPS), IEEE

作者： Meng He Yu Zhang Erya Qu Yangfan Chen State Key Laboratory of Advanced Electromagnetic China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

An integrated six-switch Buck-Boost and CLLLC cascaded converter (ISSBB-CLLLC) is proposed in this paper, which is suitable for high-voltage applications. To realize the flying capacitor voltage balance, current ripple optimization and output voltage regulation, a model of the converter is established, and a control strategy is proposed. Firstly, the balance of flying capacitor voltage in six-switch Buck-Boost circuit is analyzed, and a voltage balance control method (FCV-BCM) is proposed, which is implemented by alternatively using the redundant switching states. Next, a model of the ISSBB-CLLLC is derived and a dual closed-loop control based on phase shift control (DLC-PSC) is proposed to regulate the output voltage, which can further optimize the current ripple of inductor in six-switch Buck-Boost circuit as well. Finally, the experimental results are given to verify the effectiveness of the control strategies.

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Design and Simulation of Three-Phase electromagnetic Wiping Device for Steel Strips Hot-Dip Galvanizing

Design and Simulation of Three-Phase Electromagnetic Wiping ...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Weilin Chen Xiaotao Han Tonghai Ding Wuhan National High Magnetic Field Center and State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

electromagnetic wiping has the advantages of non-contact and easy control compared to traditional gas wiping. However, electromagnetic wiping devices available are primarily designed for cylindrical workpieces such as steel wire and pipes, leading to low efficiency when applied to steel strips. This paper presents a three-phase electromagnetic wiping device for hot-dip galvanizing of steel strips. Based on the traveling magnetic field of the linear motor, the device allows precise control over coating thickness by adjusting the frequency and amplitude of the current. A Multiphysics model of the electromagnetic field and fluid field is established to study the body force of the coating in a hot-dip galvanizing process. Simulation results show that the proposed wiping device can effectively remove the excess zinc liquid and reduce coating thickness.

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Research on the Properties of Optical Transition Radiation in HUST-FEL 3

Research on the Properties of Optical Transition Radiation i...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Zhang, Chi Zeng, Guang Hu, Yanqi Tian, Peishuai Xiong, Yongqian Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

Bunch length is one of the key longitudinal parameters in beam diagnostics, a bunch length measurement system is urgently needed to monitor the variation of bunch length in HUST-FEL. Based on a thorough investigation, we propose a measurement system using streak camera based on the optical transition radiation (OTR). We discuss the classical theory of the transition radiation (TR) in HUST-FEL in detail, simulate the angular distribution of TR at different beam energies, and select the TR target material from the perspective of economy and practicability. Considering about the practical application, we also discuss the effects of finite size target and pre-wave zone of TR based on the Weizsäcker-Williams method of virtual photon. © 2022 IEEE.

关键词： Angular distribution

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Double Closed-loop Self-regulating Active Gate Driver with High-bandwidth Peak Voltage Sampling Circuit

Double Closed-loop Self-regulating Active Gate Driver with H...

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European Conference on Power Electronics and Applications

作者： Xinbo Chen Han Peng Shijie Song State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

In this article, a double closed-loop self-regulating active gate driver (DCSAGD) for power device is proposed. The high-bandwidth peak detection circuit based on operational trans-conductance amplifier realize the accurate sampling of v DS_peak in the ns-level turn-off process. The closed-loop control strategy is realized at low cost by all analog circuit. The experimental results show that the system can accurately control v DS_peak at 500V/40A working condition under two reference voltage of 700V and 730V.

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Clustering Optimization Method for Liquid Metal Battery Screening Requirements

Clustering Optimization Method for Liquid Metal Battery Scre...

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International Conference on Power Electronics (ICPE)

作者： A. E Zhang B. Kangli Wang C. Kai Jiang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan Hubei China

Liquid metal battery (LMB) exhibits the potential to appear as a cost-effective solution for grid-scale energy storage to improve the stability and flexibility of new power systems. In order to improve the consistency and reliability of liquid metal battery packs, a novel classification method is proposed in this paper. Firstly, a feature vector for battery screening is established from the key influencing factors of battery pack performance. Secondly, the density-based spatial clustering of applications with noise (DBSCAN) algorithm whose input parameters have been optimized by the elbow method is used to detect outliers among sample data. Then, the remaining data are screened by the Mean shift algorithm and the Davies-Bouldin Index (DBI) as the optimized objective. Finally, an experimental of 216 laboratory-made LMBs with the proposed method is presented and the clustering optimization results verify that the proposed method can automatically determine the number of clustering and improve the accuracy of clustering with outlier detection.

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