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

作者： Chen, Siying Cheng, Min Li, Yingbiao Yu, Jiawei Zhu, Yihua Wu, Mingkang Hu, Jiabing Yan, Jianan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering China Yunnan Power Grid China China

ISBN: (纸本)9798350351330

DC overvoltage occurs when short circuit fault exists at the receiving-end and is harmful to the safety of the system where wind farms are connected to the grid through high-voltage direct current (HVDC) transmission based on the modular multilevel converter (MMC). To address this issue, this paper first analyzed the mechanism of the DC overvoltage and innovatively proposed a strategy in which grid-forming-controlled wind farms are integrated into the AC grid through MMC-HVDC, whose sending-end applies grid-following control and constant DC voltage control. However, secondary DC overvoltage appears during the fault recovery stage and is mainly caused by the saturation of the PI controller of constant active power control. Simulations are carried out on a test with MATLAB/Simulink, and results verify the efficacy of the proposed methods in suppressing DC overvoltage that appeared during receiving-end faults and their recovery stage. © 2024 IEEE.

关键词： MATLAB

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Microstructural evolution mechanism of Ba_(0.6)K_(α)Fe_(2)As_(2) Cu/Ag composite sheathed superconducting tapes

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Superconductivity 2025年第1期13卷 23-31页

作者： Wenchao Li Chen Guo Meng Han Minghui Tang Chiheng Dong Chao Yao Dongliang Wang Yanwei Ma Key Laboratory of High Density Electromagnetic Power and Systems(Chinese Academy of Sciences) Institute of Electrical EngineeringChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu ZhongkeJinan250013China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

Low-cost Cu/Ag composite sheathed Ba_(0.6)K_(α)Fe_(2)As_(2)superconducting tapes have been the focus of considerable research interest in terms of superconducting properties and performance *** K-doping content has a great influence on the transport critical current density(J_(c))of Cu/Ag composite sheathed *** study analyzes the evolution occurring within the micro-composition and the mechanism affecting the transport J_(c) in Ba_(0.6)K_(α)Fe_(2)As_(2)(0.42≤α≤0.54)raw material,by modulating the ratio of *** has been demonstrated that both extremes of K content,namely an insufficient or excessive amount,have an adverse effect on phase purity of the ***,this has a direct impact on the transport J_(c) of ***/Ag tapes fabricated using a precursor powder with an optimal K ratio α∼0.464 exhibited the highest performance,with a J_(c) of 5.8×10^(4) A cm^(−2) at 10 T and 4.2 *** optimized Cu/Ag composite tapes have been found to have superior advantages for high-field applications.

关键词： Ba_(0.6)K_(α)Fe_(2)As_(2) Cu/Ag composite sheath Excess K element Transport J_(c) Microstructure evolution

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Suppression of runaway current by electrode biasing and limiter biasing on J-TEXT

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Plasma Science and technology 2022年第12期24卷 7-14页

作者： Lingke MOU Zhongyong CHEN Wei YAN You LI Weikang ZHANG Jiangang FANG Yingzhou JIANG Xiaobo ZHANG Yu ZHONG Feng LI Guinan ZOU Fanxi LIU Zhipeng CHEN Zhoujun YANG Nengchao WANG Yonghua DING Yuan PAN J-TEXT Team 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

The avoidance of runaway electrons(REs) generated during plasma disruption is of great concern for the safe operation of tokamak *** study on the suppression of runaway current by electrode biasing(EB) and limiter biasing(LB) has been performed on the J-TEXT tokamak,which could be an alternative way to suppress the runaway *** experimental results show that the higher the voltage value,the smaller the runaway current in both EB and LB *** runaway current can be completely suppressed at an electrode biased voltage of +450 V and a limiter biased voltage of +300 *** comparison of the energy spectra during the runaway plateau phase shows that the maximum energy max(E_(RE)) and radiation temperature T_(HXR)hard x-rays(HXRs)are significantly reduced after the application of +200 V limiter biased *** electric field generated by the biased voltage may be the key factor to suppress the runaway current,and the measured radial electric field increases obviously after the voltage is *** may result in an increase in the loss of REs to realize the suppression of runaway current.

关键词： plasma disruption electrode biasing limiter biasing runaway current

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Superhydrophobic Fe-based amorphous coating fabricated by detonation spraying with excellent anti-corrosion and self-cleaning properties

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Rare Metals 2023年第2期42卷 629-644页

作者： Shuai Cui Hai-Min Zhai Wen-Sheng Li Wei Tong Xiao-Song Li An-Hui Cai Xiang-Juan Fan Xu-Qiang Li Dang-Sheng Xiong School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of TechnologyLanzhou730050China Hunan Provincial Key Laboratory of Electromagnetic Equipment Design and Manufacturing Hunan Institute of Science and TechnologyYueyang414000China

Amorphous alloys without crystalline defects(dislocation,crystal boundary)are ideal hydrophobic coating materials due to their low surface *** work used a synergistic method of detonation spraying and surface modification to obtain the superhydrophobic Febased amorphous coatings with high hardness and dense structure on the Q 235 *** results showed that the water contact angles(WCA)of the superhydrophobic coating was 160°±3.6°,and water droplets could bounce off the superhydrophobic coating surface,illustrating the excellent self-cleaning performance of ***,the corrosion current density(i_(corr))of the superhydrophobic coating further decreased by 2 orders of magnitude down to8.008×10^(-8)A·cm^(-2)compared to the as-deposited coating with 5.473×10^(-6)A·cm^(-2);the corrosion potential(E_(corr))of the superhydrophobic coating shifted by 34 mV to the positive side compared with that of the as-deposited coating(-310 mV).Likewise,the impedance modulus|Z|values of the superhydrophobic coating increased by nearly2 orders of magnitude up to 1×10^(5.6)compared to the asdeposited coating with 1×10^(3.8).Even through lasting immersion in NaCl for 10 days,|Z|values of the superhydrophobic coating were still much higher than those of the as-deposited *** superhydrophobic Fe-based amorphous coatings could respond to their applications under extreme conditions due to their excellent hydrophobicity and self-cleaning properties,illustrating their promising future in aerospace,automotive,and machinery industries.

关键词： Fe-based amorphous coating Detonation spraying Superhydrophobic Corrosion resistance Self-cleaning

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VSC-HVDC Traveling Wave Protection Based on Improved Ultra-High-Speed Fault Location technology

VSC-HVDC Traveling Wave Protection Based on Improved Ultra-H...

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IEEE General Meeting Power& Energy Society

作者： Zhenting Zhao Yi Shen Yinhong Li StateKey Laboratory of Advanced Electromagnetic Technology Hubei Electric Power Security and High Efficiency Key Laboratory School of Electrical and Electronic Engineering Huazhong University of Science and Technology

ISBN: (数字)9798350381832

ISBN: (纸本)9798350381849

Traveling wave protection based on the fault location technology effectively improves the sensitivity to identify the high-resistance fault for VSC-HVDC (Voltage Source Converter Based High Voltage Direct Current Transmission) grids. Some issues, however, still need to be addressed, e.g., the low speed of fault location and the difficult identification of the bus fault. To address these issues, the fault location technology is improved. The indexes of the first current traveling wave, FCIFP (First Current Integration of Fault Pole) and FCINP (First Current Integration of Non-Fault Pole), are introduced to locate faults, increasing the location speed. The bus fault can be identified according to the distance, resistance, and reactor characteristics of FCIFP and FCINP. Based on the improved fault location technology, a novel traveling wave protection is proposed. The protection is with ultra-high speed and high sensitivity to identify high-resistance and bus faults. The performance of the proposed protection is validated on a VSC-HVDC grid simulation model.

关键词： Resistance Sensitivity Voltage High-voltage techniques Fault location Power conversion Protection Inductors

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Recent progress of the ECRH system and initial experimental results on the J-TEXT tokamak

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Plasma Science and technology 2022年第12期24卷 127-137页

作者： Donghui XIA Xixuan CHEN Dengfeng XU Jiangang FANG Junli ZHANG Nengchao WANG Zhoujun YANG Zhongyong CHEN Yonghua DING Wei ZHENG Shaoxiang MA Zhijiang WANG Yuan PAN 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

In order to broaden the range of the plasma parameters and provide experimental conditions for physical research into high-performance plasma,the development of the electron cyclotron resonance heating(ECRH) system for the J-TEXT tokamak was initiated in *** the first stage,the ECRH system operated successfully with one 105 GHz/500 kW/1 s gyrotron in *** than 400 kW electron cyclotron(EC) wave power has been injected into the plasma successfully,raising the core electron temperature to 1.5 *** 2022,another 105 GHz/500 kW/1 s gyrotron completed commissioning tests which signifies that the ECRH system could generate an EC wave power of 1 MW in *** the support of the ECRH system,various physical experiments have been carried out on *** electron thermal transport in ECRH plasmas has been *** ECRH is turned on,the electron thermal diffusivity significantly *** runaway current is elevated when a disruption occurs during ECRH *** the injected EC wave power is 400 kW,the conversion efficiency of runaway current increases from 35% to 75%.Fast electron behavior is observed in electron cyclotron current drive(ECCD) plasma by the fast electron bremsstrahlung diagnostic(FEB).The increase in the FEB intensity implies that ECCD could generate fast electrons.A successful startup with a 200 kW ECW is *** the upgrade of the ECRH system,the J-TEXT operational range could be expanded and further relevant research could be conducted.

关键词： ECRH J-TEXT tokamak electron thermal transport runaway electron current assisted start-up

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Application of the interpretable disruption prediction model to the J-TEXT high-density disruption experiment 4

Application of the interpretable disruption prediction model...

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4th International Conference on Energy, Power and Electrical engineering, EPEE 2024

作者： Lin, Weijie Shen, Chengshuo Gao, Li Yang, Zhoujun Huazhong University of Science and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798331518066

Nuclear fusion energy generated by magnetic confinement reactors plays a central role in preventing global energy insecurity and atmospheric pollution. Disruption as a plasma instability can terminate the fusion reaction and damage key components. Predicting and mitigating disruption represents one of the pressing challenges for tokamak devices. Moreover, the disruption predictor can be used for more than just predicting disruption owing to the learned disruption physics. In our previous research, an interpretable disruption predictor(IDP-PGFE) was developed to predict disruption and brought a new sight for disruption experiments under RMPs. Electron Cyclotron Resonance Heating (ECRH) can affect the density limit in experiments conducted on J-TEXT. Distinguishing the causes of disruption in high-density experiments under ECRH helps the understanding of physics mechanisms. In this paper, the application of IDP-PGFE in high-density disruption experiments under ECRH has been introduced. Benefiting from strong interpretability, IDP-PGFE can help researchers accurately identify various types of disruptions, including typical density limit disruptions, radiation-enhanced disruptions, and those driven by increased Magnetohydrodynamics (MHD) instabilities. This approach provides valuable insights into the mechanisms underlying disruption events and contributes to advancing disruption prediction capabilities in fusion research. © 2024 IEEE.

关键词： Tokamak devices

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An Optimal Direct Torque Control Scheme for DC-biased Vernier Reluctance Machine Drives

An Optimal Direct Torque Control Scheme for DC-biased Vernie...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Li, Zimin Kong, Wubin 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

ISBN: (纸本)9798350316445

An optimal direct torque control (OPT-DTC) scheme is proposed for DC-biased vernier reluctance machines (VRMs) to improve the steady and dynamic performance of drive system. Firstly, the nonlinear model of DC-biased VRM is proposed in synchronous rotating frame. Then, the optimal control theory is employed to the model by designing an optimal torque controller with the ability of regulating zero-sequence current. The feedforward control terms are designed to improve the dynamic response, and the feedback control terms are designed to improve the steady performance. An optimal load torque observer is designed for speed control. Finally, comparative experiments with conventional DTC schemes for DC-biased VRMs are carried out to verify the superior performance of the proposed method, including higher accuracy of torque and flux and faster dynamic response. © 2023 IEEE.

关键词： direct torque control Optimal control reluctance machines

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Fusion power supply advances by the J-TEXT engineering team

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Plasma Science and technology 2022年第12期24卷 85-100页

作者： Ming ZHANG Hongqi ZHANG Rumeng WANG Xiaohan XIE Wenshan WANG Yixing JIANG Zhiheng LI Peilong ZHANG Liye WANG Shaoxiang MA Yong YANG Wei ZHENG Bo RAO International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China

To meet the stringent requirements of the fusion power supply for large-scale fusion devices,the J-TEXT engineering team has carried out key technology research and applications in several important directions of fusion power *** article presents the advances made by the J-TEXT engineering team in recent years in the following areas:(1) a high-voltage power supply for an auxiliary heating system;(2) a breakdown protection device for an auxiliary heating power supply;(3) magnetic field compatibility;(4) a high-voltage pulsed power supply for a fieldreversed configuration;(5) a large physics experimental facility control *** research backgrounds,technical progress,test results,applications,summaries and prospects are described in detail in each *** innovative research results and valuable engineering experience can promote the progress of fusion power supply technology,and also lay a foundation for the development of power supplies with higher parameters in the future.

关键词： high-voltage DC power supply breakdown protection magnetic field compatibility high-voltage pulsed power supply control system

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A Novel Control Strategy of Air-Core Pulsed Alternators for Driving electromagnetic Railgun 5th

A Novel Control Strategy of Air-Core Pulsed Alternators for ...

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5th International Conference on Energy Storage and Intelligent Vehicles, ICEIV 2022

作者： Wang, Jiasong Xie, Xianfei Yu, Kexun State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819910267

The pulse power system based on the air-core pulse alternator (ACPA) takes into account the high energy storage density and high power density, has the advantages of miniaturization, lightness and high repetitive output frequency, and is an important technical way of pulse power for electromagnetic railgun. It is necessary to make the speed of electromagnetic rail gun controllable and reduce the muzzle current in the process of actual combat, but the proposed working principle has not yet studied the speed control of rail gun and the strategy of reducing the muzzle current. In this paper, the two-phase discharge process of the ACPA is analyzed through the superconducting loop magnetic chain conservation and the characteristics of its commutation overlap process are analyzed. Then the feedback predictive control of rail gun speed based on pulse wave number control is derived on the basis of two-phase discharge, and the relationship between the initial excitation current of the discharge and the discharge speed of the rail gun is analyzed, and a possible continuous control of the speed of the rail gun based on the pulse power system of the ACPA is proposed. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Speed control

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