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27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Cai, Kunsheng Wang, Shuanghong Li, Zixin Huazhong University of Sciecnce and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9784886864406

Traditional Sliding Mode Observers (SMO) in sensorless control of Permanent Magnet Synchronous Motors (PMSM) encounter issues such as chattering and phase delay, resulting in significant discrepancies between the estimated and actual rotor speed and position. Therefore, this paper proposes an improved SMO based on a Fuzzy Logic Controller (FLC) and an Open-Loop Frequency Estimation-based Second-Order Generalized Integrator Frequency Adaptive Filter (OLFE-SOGI) structure. The FLC implements an SMO with a selfadjusting shape factor for the sigmoid function. This strategy accelerates the convergence speed of the SMO while reducing chattering caused by the boundary layer thickness. Additionally, to mitigate the adverse effects brought by lowpass filters (LPF), the OLFE-SOGI is employed to accurately extract the back electromotive force (back-EMF) without phase delay and effectively eliminate high-order harmonic components. Simulation results verify the effectiveness and accuracy of the proposed strategy. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Permanent magnets

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Inertial PLL of Grid-connected Converter for Fast Frequency Support

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CSEE Journal of Power and Energy Systems 2023年第4期9卷 1594-1599页

作者： Xiang Guo Donghai Zhu Jiabing Hu Xudong Zou Yong Kang Josep M.Guerrero State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China. Department of Energy Technology Aalborg UniversityAalborg 9220Denmark

Frequency support capability for the grid-connected converter(GCC)is one of the basic safeguards for the stability of renewables-dominated power *** this paper,analogous to the motion equation of a synchronous generator(SG),an inertial phase-locked loop(iPLL)is proposed for GCC to achieve fast frequency *** iPLL introduces the inertial and damping loops into the classic PLL structure to emulate the natural frequency regulation characteristics of a *** with the existing methods,the iPLL has a faster frequency response and is simpler in design and ***,the proposed iPLL method is validated by *** Terms-Frequency support,grid-connected converter,inertial phase-locked loop(iPLL),synchronous generation(SG).

关键词： Frequency support grid-connected converter inertial phase-locked loop(iPLL) synchronous generation(SG).

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Modeling and Control of a High-power DC-DC Hydrogen Converter Based on DC Grid 9

Modeling and Control of a High-power DC-DC Hydrogen Converte...

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9th Asia Conference on Power and Electrical engineering, ACPEE 2024

作者： Zhou, Rui Xiao, Fei Liu, Jilong Duan, Shanxu Li, Yufan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Naval University of Engineering National Key Laboratory of Electromagnetic Energy Wuhan China

ISBN: (纸本)9798350309638

Water electrolysis hydrogen generation is considered as a prospective solution to the problem of the renewable energy sources (RES) absorption. To expand the capacity of the high-power hydrogen production system, the hydrogen converter based on the medium-voltage DC bus (MVDCB) is a key equipment. An isolated modular converter is designed in this paper, which can achieve the high step-down ratio, electrical isolation, low output current ripple, high efficiency, and fault isolation capabilities. Considering the dynamic characteristics of proton exchange membrane water electrolyzer (PEMWE) coupled with RES, the modelling method and control strategy are studied by combining the equivalent dynamic electrical models of PEMWE. Finally, the control strategy is verified by simulation. © 2024 IEEE.

关键词： Water absorption

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A novel flexible plasma array for large-area uniform treatment of an irregular surface

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Plasma Science and technology 2022年第3期24卷 130-137页

作者： Baowang LIU Fei QI Dejiang ZHOU Lanlan NIE Yubin XIAN Xinpei LU State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic

In this work,we demonstrate a flexible multi-pin plasma generator with movable electrodes,which can change the shape of the electrode array freely,and then provide a large-area uniform plasma for the treatment of surfaces of different *** characteristics including U-I waveforms and discharge images and sterilization performance under three different electrode configurations(flat-flat,flat-curve,curve-curve)are *** similar results are acquired between the flat-flat configuration and the curve-curve configuration,which is much better than that under flat-curve *** flexible multi-pin plasma generator offers a simple method to treat different irregularly shaped surfaces uniformly with a single ***,this device provides a foundation for developing a self-adaption large-scale uniform plasma generator by further introducing automatic adjustment of the position of every electrode driven by motors with discharge current feedback in the following *** it will promote the applications of atmospheric-pressure cold plasmas significantly.

关键词： flexible multi-pin electrode large-area uniform plasma sterilization

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Realisation of the reconfigurable pulsed high magnetic field facility and its scientific application at Wuhan National Pulsed High Magnetic Field Centre

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High Voltage 2023年第5期8卷 898-906页

作者： Jianfeng Xie Shaozhe Zhang Jiangtao Shi Junfeng Wang Liang Li Xiaotao Han Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhanChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina

To generate arbitrary shape magnetic field waveforms for advanced scientific research,a reconfigurable pulsed high magnetic field facility(PHMFF)was developed at Wuhan National Pulsed High Magnetic Field Centre(WHMFC).First,the basic elements of PHMFF are introduced,and a ternary physical model composed of energy storage unit,magnet,transmission circuits and other auxiliary units is summarised to describe various magnetic field ***,in order to realise the reconfiguration of magnetic field systems based on detailed elements,the control system with the ability of dynamic construction and control sequence reconfiguration is *** this basis,the PHMFF has been realised and various magnetic field systems are constructed to produce arbitrary shape magnetic field waveforms,such as half‐sine,ultra‐high,flat‐top and repetitive field pulses,which not only enhances the capability and efficiency of PHMFF,but also makes more scientific research possible in pulsed magnetic *** far,a peak magnetic field of 94.8 T,a flat‐top magnetic field of 64 T/10 ms and a repetitive magnetic field waveform of 20 T/60 Hz have been achieved,and some experiments and studies on the physical properties of materials have been carried out at WHMFC.

关键词： magnetic field pulsed

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Advance Warning Prior to Capacity Plunge of Liquid Metal Battery Using Data-driven Methods

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IEEE Transactions on Industry Applications 2025年第3期61卷 4147-4154页

作者： Shi, Qionglin Zhou, Min Li, Haomiao Wang, Kangli Jiang, Kai Ministry of Education Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering School of Electrical and Electronic Engineering Engineering Research Center of Power Safety and Efficiency Wuhan China

The liquid metal battery (LMB) has gained attention as a novel energy storage technology due to its exceptional safety and long lifespan. Analyzing the aging trajectory, particularly capacity plunge process, is crucial for understanding its aging mechanism and enabling effective health diagnosis. However, it often lacks clear warning signs prior to the capacity plunge, hindering accurate capacity prediction and proactive measures in real-world applications. To address this challenge, this study proposes a data-driven method that effectively quantifies the capacity various in LMBs, enabling advance warning before the occurrence of a capacity plunge. Firstly, the Empirical Mode Decomposition method decomposes the capacity data into several components, representing different characteristics of LMBs. Subsequently, a Gaussian mixture model is applied to construct the feature distribution for each component, which exhibits a hump-shaped pattern. Finally, The Jensen-Shannon divergence is used to quantify the divergence of these humps, offering a concrete measure of LMB health and aging progression. The proposed method integrating both aging analysis and data-driven insights provides an advance warning of the capacity plunge, offering a reliable foundation for future lifespan prediction and fault diagnosis of LMBs. © 2025 IEEE.

关键词： Network security

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Conversion-type cathode materials for high energy density solid-state lithium batteries

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Journal of Energy Chemistry 2025年第1期100卷 409-425页

作者： Yuhao Ma Shihong Qing Hongyu Liu Chuntao Ma Yuan Yu Chuang Yu Liping Wang School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology Zhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Solid-state lithium batteries(SSLBs)are regarded as an essential growth path in energy storage systems due to their excellent safety and high energy *** particular,SSLBs using conversion-type cathode materials have received widespread attention because of their high theoretical energy densities,low cost,and *** the great progress in research and development of SSLBs based on conversiontype cathodes,their practical applications still face challenges such as blocked ionic-electronic migration pathways,huge volume change,interfacial incompatibility,and expensive processing *** review focuses on the advantages and critical issues of coupling conversion-type cathodes with solid-state electrolytes(SSEs),as well as state-of-the-art progress in various promising cathodes(e.g.,FeS_(2),CuS,FeF_(3),FeF_(2),and S)in ***,representative research on conversion-type solid-state full cells is discussed to offer enlightenment for their practical ***,the energy density exhibited by the S cathode stands out impressively,while sulfide SSEs and halide SSEs have demonstrated immense potential for coupling with conversion-type ***,perspectives on conversion-type cathodes are provided at the material,interface,composite electrode,and battery levels,with a view to accelerating the development of conversion-type cathodes for high-energy–density SSLBs.

关键词： Conversion-type cathode Lithium-free cathode Solid-state electrolyte Solid-state lithium battery High energy density

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Dynamic Modeling and Operations of a Heat-power Station System Based on Renewable Energy

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CSEE Journal of Power and Energy Systems 2022年第4期8卷 1110-1121页

作者： Zhenxing Li Jianyu Zhou Jinyu Wen Xia Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The coexistence of pollution from coal-fired heating and inefficient utilization of renewable resources in northern China has raised great *** studies on heat-power systems are primarily focused on traditional combined heat and power(CHP)systems and are limited to static energy flow analysis or the dynamic characteristics of a single system ***,it is difficult to make full use of the complementary potential of electrical energy and heat *** paper proposes a heat-power station(HPS)system based on renewable energy for the purpose of utilizing the surplus renewable energy to generate heat and meet heating *** overall architecture of the HPS system is established and its operational principle and dynamic characteristics of both the electrical and heating components in the system are analyzed and dynamic mathematical models are also *** addition,a coordinated electro-thermal control method based on system characteristics is designed to ensure the normal operation of a *** results verify the effectiveness of the model and control in the case of renewables fuctuation and heat load variations.

关键词： Coordinated control dynamic model and simulation heat-power station renewable energy

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AtomGAN:unsupervised deep learning for fast and accurate defect detection of 2D materials at the atomic scale

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Science China(Information Sciences) 2023年第6期66卷 102-114页

作者： Danpeng CHENG Wuxin SHA Zuo XU Shide LI Zhigao YIN Yuling LANG Shun TANG Yuan-Cheng CAO State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and Technology School of Computer Science and Technology Huazhong University of Science and Technology CITIC Dicastal Co. Ltd.

The extraction of atomic-level material features from electron microscope images is crucial for studying structure-property relationships and discovering new materials. However, traditional electron microscope analyses rely on time-consuming and complex human operations; thus, they are only applicable to images with a small number of atoms. In addition, the analysis results vary due to observers' individual deviations. Although efforts to introduce automated methods have been performed previously, many of these methods lack sufficient labeled data or require various conditions in the detection process that can only be applied to the target material. Thus, in this study, we developed AtomGAN, which is a robust, unsupervised learning method, that segments defects in classical 2D material systems and the heterostructures of MoS2/WS2automatically. To solve the data scarcity problem, the proposed model is trained on unpaired simulated data that contain point and line defects for MoS2/WS2. The proposed AtomGAN was evaluated on both simulated and real electron microscope images. The results demonstrate that the segmented point defects and line defects are presented perfectly in the resulting figures, with a measurement precision of 96.9%. In addition, the cycled structure of AtomGAN can quickly generate a large number of simulated electron microscope images.

关键词： deep learning generative adversarial network defect detection atomic resolution 2D materials

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Research on Decoupling of Units in Distribution Networks 10

Research on Decoupling of Units in Distribution Networks

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10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Liu, Xuhua Zhang, Weiguo Shi, Xiaojie Lin, Lei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350351330

The intricate interactions between substantial line impedance and diverse integration techniques have resulted in a strong coupling among PV inverters, imposing a significant challenge to achieve the independent and efficient voltage/power regulation for PV units. To tackle the challenges, this paper presents a novel approach to decouple distributed PV units connected to a distribution network via different interconnection methods. Firstly, an equivalent line impedance derivation method is proposed to streamline the complex coupled distribution network into a unified "PV unit - line impedance - grid"structure while preserving the node information. Then, a "Line Impedance Equivalent Coefficient (LEC)"is defined to capture the evolving characteristics of the equivalent line impedance. Moreover, by treating the chain structure as a special radial form, the proposed method handles diverse network structures with a minimal computational complexity. Simulation results from Matlab/Simulink demonstrate the effectiveness of this method in decoupling radial, chain and hybrid networks. © 2024 IEEE.

关键词： Electric power distribution

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