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

作者： Zhong, Yuanhao Chen, Changsong Cui, Bowen Bai, Chenxi He, Taihang School of Electrical and Electronic Engineering Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798331530174

Due to the good weak grid adaptability and grid support capability, Grid-Forming (GFM) energy storage converter is considered to be an effective solution for the grid-connected interface of new power systems. When a symmetrical low-voltage fault occurring, grid-forming converters may face transient overcurrent problems during the fault and recovery phases. A virtual synchronous generator (VSG)-controlled GFM converter is take as the research object in this paper and a low-voltage ride-through (LVRT) control method of GFM converter is proposed, which realizes the current limitation of GFM converter under low-voltage fault by using adaptive virtual impedance. On the basis of guaranteeing the voltage source characteristics of GFM converter, L VRT control method injects reactive current into the grid according to standards. Finally, based on the Simulink/Matlab simulation platform, the effectiveness of L VRT control method for transient current suppression is verified. © 2024 IEEE.

关键词： Synchronous generators

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Multivariate Evaluation and Enhancement Methods of the Hosting Capacity of Distributed Photovoltaic

Multivariate Evaluation and Enhancement Methods of the Hosti...

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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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Modulation Strategy for 2-SiC Hybrid Devices ANPC-DAB Converter Through Dual-Path Zero-state 10

Modulation Strategy for 2-SiC Hybrid Devices ANPC-DAB Conver...

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

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

ISBN: (纸本)9798350351330

The active-neutral-point-clamped three-level dual active bridge (ANPC-DAB) converter is a prominent topology for medium voltage applications. To realize high cost-efficiency, the hybrid utilization of Si and SiC devices has been an attractive approach. In this paper, a 2-SiC hybrid devices ANPC-DAB converter is studied, which optimally utilizes both Si IGBTs and SiC MOSFETs to achieve the tradeoff between performance and cost. A modulation strategy through dual-path zero-state (DPZS) is proposed to achieve zero-voltage switching (ZVS) turn-on of all switches when combining proper current conditions and optimally balance the switching losses among the switches. Meanwhile, the presented method achieves small dead zones and short commutation loops during switching process. Finally, the experimental results are given to verify the effectiveness of the modulation strategy. © 2024 IEEE.

关键词： Silicon carbide

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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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Efficient direction-independent fog harvesting using a corona discharge device with a multi-electrode structure

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Plasma Science and technology 2022年第9期24卷 98-107页

作者： Dingchen LI Chuan LI Jiawei LI Wendi YANG Menghan XIAO Ming ZHANG Yong YANG Kexun YU International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Efflcient collection of water from fog can effectively alleviate the problem of water shortages in foggy but water-scarce areas,such as deserts,islands and so *** inefflcient fog meshes,corona discharge can charge water droplets and further enhance the water-collecting *** study proposes a novel multi-electrode collecting structure that can achieve efflcient and direction-independent water collection from *** multi-electrode structure consists of three parts:a charging electrode,an intercepting electrode and a ground *** types of watercollecting structures are compared experimentally,and the collection rates from a traditional fog mesh,a wire-mesh electrode with fog coming from a high-voltage electrode,a wire-mesh electrode with fog coming from a ground electrode and a multi-electrode structure are 2–3 g h^(-1),100–120 g h^(-1),60–80 g h^(-1)and 200–220 g h^(-1),*** collection rate of the multielectrode structure is 100–150 times that of a traditional fog mesh and 2–4 times that of a wiremesh *** results demonstrate the superiority of the multi-electrode structure in fog *** addition,the motion equation of charged droplets in an electric fleld is also derived,and the optimization strategy of electrode spacing is also *** structure can be applied not only to fog collection,but also to air puriflcation,factory waste gas treatment and other flelds.

关键词： fog collection corona discharge wire-mesh electrode multi-electrode structure collection rate

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Research on Coupling Simulation Method of Temperature Field and Stress Field in Double-Layer Thin-Walled Corrugated Tube 18th

Research on Coupling Simulation Method of Temperature Field ...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Tong, Yingjie Cai, Jiaqi Peng, Sisi Chen, Lingxuan Ding, Xuan Xu, Ying Li, Xianhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Electromagnetic Energy Wuhan Institute of Marine Electric Propulsion Wuhan430064 China

ISBN: (纸本)9789819710676

In recent years, with the increasing power load in major cities in China, the existing conventional power cables are unable to meet the high-density and high-capacity power transmission requirements. High-temperature superconducting cables, with their characteristics of high capacity, low loss, compact structure, energy-saving, and environmental-friendliness, have promising applications for future urban high-density power transmission. As one of the key components in the cryogenic refrigeration system of superconducting cables, the mechanical performance of double-layer thin-walled stainless steel corrugated tubes directly determines the ability of superconducting cables to resist external forces. In order to study the mechanical performance of double-layer thin-walled stainless steel corrugated tubes under the operating conditions of superconducting cables, this paper establishes a three-dimensional shell model of double-layer thin-walled stainless steel corrugated tubes under tension and bending conditions using finite element simulation. It analyzes the stress and plastic strain distribution characteristics of the double-layer thin-walled corrugated tubes and proposes a temperature field and stress field coupling simulation method for double-layer thin-walled corrugated tubes. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Finite element method

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Online Multiparameter Estimation with Position Error Correction for Unified Synchronous Machine Sensorless Drives

Online Multiparameter Estimation with Position Error Correct...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Liu, Zirui Kong, Wubin Fan, Xinggang Wang, Fei Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350316445

Parameters' accuracies are essential for model-based sensorless control in synchronous machine drives. In this paper, a multiparameter adaptive observer and a position error optimizer are presented to obtain real-time parameter information in the absence of rotor position data for unified synchronous machine (SM). The adaptive observer is based on the misaligned dq-axes' small-signal impedance model where dq-axes EMF coupling terms are well considered. All parameters can achieve high accuracy under entire operation region. In the case of isotropic SMs, the estimated parameters can be directly utilized in the model-based observer to acquire high precision position observation. And, for anisotropic SMs, an optimizer is introduced to correct parameter inaccuracies caused by position error. The effectiveness of the proposed adaptive observer and optimizer is evaluated through a combination of experiments and simulations, providing comprehensive validation of their performance. © 2023 IEEE.

关键词： Multiparameter Estimation Sensorless Control Unified Synchronous Machine (SM)

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Switch Open-Circuit Faults Diagnosis in Three-Phase PWM Rectifier Based on Phase and Transient Model

Switch Open-Circuit Faults Diagnosis in Three-Phase PWM Rect...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Lin, Zhongdong Peng, Li Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350307832

Numerous studies have shown that the power switch devices have high fault rate in converters. Aiming at above problem, this paper proposes a switch open-circuit faults (SOCF) diagnosis method in three-phase pulse-width modulation (PWM) voltage source rectifier (VSR). The diagnosis algorithm is based on phase information from the phase-locked loop (PLL) and line voltage deviations calculated by the transient model. The proposed method can accurately and rapidly diagnose all kinds of single and double SOCF, without extra hardware. Finally, simulations in MATLAB/Simulink verify the robustness and effectiveness of the proposed method. © 2023 IEEE.

关键词： Pulse width modulation

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Ultrathin GaN Film Derived from Amorphous Ga_(2)O_(3) Film

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Journal of Wuhan University of technology(Materials Science) 2024年第4期39卷 814-818页

作者：王鹏 ZHANG Binbin LIU Xiaofei ZHANG Xin TU Rong ZHANG Song 李宝文 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

It remains a big challenge to synthesize two-dimensional(2D)GaN material for applications in power *** synthetic methods require complex equipment and processes and time ***,we reported a two-step route to prepare polycrystalline 2D GaN *** amorphous ultrathin Ga_(2)O_(3)film was first exfoliated from the surface of liquid *** a vapor phase reaction,2D Ga_(2)O_(3)film was then converted into 2D GaN film while maintaining the 2D *** and high-resolution transmission electron microscope(HRTEM)analysis implies the successful synthesis of wurtzite-type GaN ultrathin *** simple strategy proposed in this work will provide more opportunities for applications of GaN ultrathin film in many devices.

关键词： GaN Ga_(2)O_(3) liquid gallium

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Towards high-field applications: high-performance,low-cost iron-based superconductors

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National Science Review 2024年第11期11卷 225-244页

作者： Chiheng Dong Qingjin Xu Yanwei Ma Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of Sciences Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology University of Chinese Academy of Sciences Institute of High Energy Physics Chinese Academy of Sciences

High magnetic fields play a crucial role in advancing basic sciences, fusion energy, and magnetic resonance imaging systems. However, the widespread use of high-field magnets requires affordable high-temperature superconducting wires that can carry large supercurrents. Iron-based superconductors offer an economically attractive solution to push forward important yet costly scientific programs, such as nuclear fusion reactors and next-generation particle accelerators. In this review, we start with the fabrication of iron-based superconducting wires and tapes and continue to discuss several key factors governing the current transport properties. state-of-the-art wires and tapes are introduced with emphasis on grain boundary characteristics,flux pinning, and anisotropy. The architecture of flexible conductors enables low cost, high mechanical strength, and high thermal stability. Recent progress in practical applications, including superconducting joints and insert coils, is also reviewed. Finally, we propose several key questions faced by iron-based superconductors in future practical applications.

关键词： iron-based superconductors superconducting wires critical current density flux pinning superconducting joints high-field magnets

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