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Dynamic performance of linear electromagnetic actuators in a stray magnetic field:theoretical analysis and experimental verification

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Plasma Science and technology 2022年第12期24卷 213-222页

作者： Rumeng WANG Yong YANG Shaoyu WANG Ming ZHANG 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

Linear electromagnetic actuators(LEAs) are widely used in tokamaks,but they are extremely sensitive to and are prone to fail in a high-strength stray magnetic field(SMF),which is usually a concomitant with *** this paper,a multi-physics coupling analysis model of LEA,including magnetic field,electric circuit and mechanical motion,is proposed,and the dynamic characteristics of LEAs in SMFs are studied in detail based on the proposed *** failure mechanism of LEAs in SMFs is revealed,and the influence of SMFs on the dynamic performance of LEAs is studied and *** is shown that the failure threshold of the LEA selected in this work under the rated condition is 27 mT and 14 mT in the positive and negative direction,*** a typical SMF of 10 mT in the negative direction,the closing time of the LEA will be extended by 40%,while its opening time will be shortened by about 10%.Experimental tests are also conducted,which verify the validity of the proposed model and the analysis *** paper provides a basis for the diamagnetic optimization design of LEA,and it is of great significance to ensure the reliable operation of the tokamak.

关键词： linear electromagnetic actuator stray magnetic field dynamic performance collision velocity

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Fault diagnosis algorithm for 3-phase passive rectifiers based on frequency-domain analysis for acceleration grid power supply in CFETR NBI system

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Plasma Science and technology 2022年第12期24卷 40-54页

作者： Bangyou ZHU Shaoxiang MA Hongqi ZHANG Zhiheng LI Ming ZHANG 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

The acceleration grid power supply(AGPS) is a crucial part of the Negative-ion Neutral Beam Injection system in the China Fusion engineering Test Reactor,which includes a 3-phase passive(diode) *** diagnose and localize faults in the rectifier,this paper proposes a frequencydomain analysis-based fault diagnosis algorithm for the rectifier in ***,time-domain expressions and spectral characteristics of the output voltage of the TPTL-NPC inverter-based power supply are ***,frequency-domain analysis-based fault diagnosis and frequency-domain analysis-based sub-fault diagnosis algorithms are proposed to diagnose open circuit(OC) faults of diode(s),which benefit from the analysis of harmonics magnitude and phase-angle of the output *** a fundamental period is needed to diagnose and localize exact faults,and a strong Variable-duration Fault Detection Method is proposed to identify acceptable ripple from OC *** simulations and experimental results demonstrate the effectiveness,quickness,and robustness of the proposed algorithms,and the diagnosis algorithms proposed in this article provide a significant method for the fault diagnosis of other rectifiers and converters.

关键词： fault diagnosis 3-phase passive rectifier acceleration grid power supply(AGPS) fault localization

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Model Predictive Control Based Frequency Regulation for Power Systems Containing Massive Energy Storage Clusters 5th

Model Predictive Control Based Frequency Regulation for Powe...

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

作者： Lin, Yujun Yang, Qiufan Zhou, Jianyu Chen, Xia Wen, Jinyu 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

A large number of small-capacity distributed energy storage (ES) systems have been introduced to take an important part in grid frequency regulation. However, the accompanying high-order optimization problem causes an inevitable issue for both centralized and distributed control methods. Accordingly, based on the reduced-order predictive model, a two-layer control strategy of frequency support for power systems is proposed in this paper, in which the frequency regulation and economic dispatch are combined. The lower layer is implemented in a distributed framework which only requires communication between adjacent ESs, and the upper layer only utilizes the reduced-order information sent from the lower layer which lessens the computation burdens. The effectiveness of the entire control method is validated under different scenarios by simulations. As indicated in the simulation results, the proposed method achieves almost the same control effect in ES clusters as that using centralized control with a shorter computing time. And the proposed method incorporates the widespread multiple small-capacity ESs effectively for power system frequency control. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Model predictive control

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electromagnetic Performance Analysis of Homopolar Inductor Alternator with Radial Externally Movable Permanent Magnets 18th

Electromagnetic Performance Analysis of Homopolar Inductor A...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Liu, Longjian Yu, Kexun Xie, Xianfei Liu, Zhijian Guo, Cheng Zhang, Ming Rao, Bo Sun, Xiangfei Faculty of Electric Power Engineering Kunming University of Science and Technology Kunming650500 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819714193

This article proposes a homopolar inductor alternator with a permanent magnet that can move radially outward. The motor has lower no-load electromagnetic losses under idle operating conditions, which can effectively increase the efficiency of the flywheel energy storage system. This article introduces the structure of this motor and analyzes the operating principle of this motor. As the distance between permanent magnet and motor stator is different, the magnetic field strength in the main magnetic circuit of motor is different, and the magnetic field of motor can be adjusted by adjusting the radial displacement of permanent magnet. Finally, the theoretical calculation results were verified using finite element simulation. The simulation results show that the proposed mechanical magnetic induction motor has very low no-load iron loss under idle operating conditions. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Permanent magnets

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Characteristics of the SOL ion-to-electron temperature ratio on the J-TEXT tokamak with different plasma configurations

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Plasma Science and technology 2024年第2期26卷 13-21页

作者：李存凯梁云峰江中和周松华建坤阳杰杨庆虎 Alexander KNIEPS Philipp DREWS 徐鑫毛飞越谢伟杨雨桐郭金龙李杨波任正康陈志鹏王能超 the 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 Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung—PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Julich 52425Germany 不详

Accurate measurement of the average plasma parameters in the edge region,including the temperature and density of electrons and ions,is critical for understanding the characteristics of the scrape-off layer(SOL) and divertor plasma transport in magnetically confined fusion *** the J-TEXT tokamak,a multi-channel retarding field analyzer(RFA) probe has been developed to study average plasma parameters in the edge region under various poloidal divertor and island divertor *** edge radial profile of the ion-to-electron temperature ratio,τ_(i/e),has been determined,which gradually decreases as the SOL ion self-collisionality,v_(SOL)*,*** is broadly consistent with what has been observed previously from various tokamak ***,the comparison of experimental results under different configurations shows that in the poloidal divertor configuration,even under the same v_(SOL)*,τ_(i/e) in the SOL region becomes smaller as the distance from the X-point to the target plate *** the island divertor configuration,τ_(i/e) near the O-point is higher than that near the X-point at the same v_(SOL)*,and both are higher than those in the limiter *** results suggest that the magnetic configuration plays a critical role in the energy distributions between electrons and ions at the plasma boundary.

关键词： ion temperature island divertor poloidal divertor retarding field analyzer(RFA)probe

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Revealing performance of 78Li_(2)S-22P_(2)S_(5) glass ceramic based solid-state batteries at different operating temperatures

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Chinese Chemical Letters 2023年第7期34卷 418-422页

作者： Chaochao Wei Xinrong Liu Chuang Yu Shaoqing Chen Shuai Chen Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

78Li_(2)S-22P_(2)S_(5) are sulfide electrolytes with high lithium-ion conductivity and wide electrochemical windows in the Li_(2)S-P_(2)S_(5) system,making them attractive solid electrolytes for ***,the role and potential of 78Li_(2)S-22P_(2)S_(5) solid electrolytes over a wide temperature range are still not fully ***,we constructed solid-state batteries with NCM622 as the positive electrode and 78Li_(2)S-22P_(2)S_(5) glass-ceramics as the electrolyte to investigate in depth the differences in battery performance over a wide temperature range and their intrinsic *** in-situ impedance and relaxation time distribution (DRT) demonstrated the electrochemical stability of the electrolyte over a wide temperature range,while the in-situ stacking pressure observed a large volume change during cycling at 60℃,leading to local solid-solid contact failure and poor cycling *** study provides insight into the advantages and problems of 78Li_(2)S-22P_(2)S_(5) in the wide temperature range as well as a basis for the construction of ASSLBs with high energy density and long cycle life.

关键词： 78Li_(2)S-22P_(2)S_(5)electrolytes Li-ion conductivity Operating temperature Battery performance Volume changes Interfacial resistance

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Energy router interconnection system: A solution for new distribution network architecture toward future carbon neutrality

Energy Conversion and Economics

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Energy Conversion and Economics 2022年第4期3卷 181-200页

作者： Liu, Bin Zhu, Bingzhao Guan, Ziyou Mao, Chengxiong Wang, Dan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

Under the background of carbon neutrality, distribution networks are facing many new challenges, including providing higher power supply reliability and power quality, additional power supply forms, and better information sharing. The traditional distribution network has difficulty coping with these challenges;thus, it is imperative to transform the traditional distribution network architecture. An energy router (ER) is a type of intelligent power electronic device, and has the potential to play a great role in the transformation of the distribution network. This paper proposes the basic architecture of an ER interconnection system (ERIS), where multiple ERs are gathered together to play a stronger role. Aiming for two different stages of the transformation process of the distribution network, two types of ERISs are employed for a single prosumer and multiple prosumers, respectively. The equivalent modelling, main control strategies, and energy management schemes of the two types of ERIS are respectively illustrated. Several ERIS simulation cases are investigated, and the results verify the advantages and satisfactory performance of the ERIS. The proposed ERIS provides an effective solution for building a new distribution network to adapt to the new challenges in a future carbon neutral era. © 2022 The Authors. Energy Conversion and Economics published by John Wiley & Sons Ltd on behalf of The Institution of engineering and technology and the State Grid Economic & Technological Research Institute Co., Ltd.

关键词： Network architecture

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Analysis of electromagnetic Performance of a Pulsed HIA with Novel Compensating Winding 1

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Liu, Longjian Yu, Kexun Xie, Xianfei Liu, Zhijian Guo, Cheng Faculty of Electric Power Engineering Kunming University of Science and Technology Kunming650500 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (数字)9789819713516

ISBN: (纸本)9789819713509

This article proposes a homopolar inductor alternator (HIA) with a special compensation winding, which is a three-phase winding and has twice the number of poles as a regular armature winding. Two methods can be used: passive compensation and active feeding. This article uses finite element simulation (FEM) to verify the effectiveness of the compensation-type HIA proposed in this article, and compares the compensation effects of passive compensation and active feeding. The research results in this paper show that both passive compensation and active feeding compensation can improve the charging power and motor power density, and the active feeding compensation effect is better. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Feeding

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Analysis of Repetition Capacitor Charge System Based on Permanent Magnet Excited Homopolar Inductor Alternator 18th

Analysis of Repetition Capacitor Charge System Based on Perm...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

ISBN: (纸本)9789819713509

This article proposes a capacitor charging pulse power supply based on a permanent magnet excitation homopolar inductor generator (HIG). Compared with ordinary HIG, it does not require an external excitation power supply, and has the advantages of a simpler system and no excitation loss in the motor. And a mechanical magnetic adjustment method was adopted to reduce iron loss during no-load operation. The average value analysis model of the power supply system was analyzed, and it was pointed out that the difference between the permanent magnet excitation induction motor and the ordinary induction motor model lies in the different values of the equivalent internal inductance. The equivalent inductance of the permanent magnet excitation HIG is related to the dq axis inductance value, while the equivalent inductance of the ordinary HIG is related to the transient dq axis inductance value. The correctness of the average-value model was verified through finite element simulation, and the effectiveness of the magnetic adjustment ring was verified, which can significantly reduce the no-load iron loss of the motor. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Permanent magnets

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Tuning Solid Interfaces via Varying Electrolyte Distributions Enables High-Performance Solid-State Batteries

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Energy & Environmental Materials 2023年第2期6卷 26-33页

作者： Linfeng Peng Chuang Yu Ziqi Zhang Ruonan Xu Mengjun Sun Long Zhang Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430000China School of Physics Huazhong University of Science and TechnologyWuhan 430000China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430000China

Solid/solid interface is the major challenge for high-performance solid-state *** electrolytes(SEs)play a crucial role in the fabrication of effective interfaces in solid-state ***,the electrolyte distribution with varied particle sizes is tuned to construct solid-state batteries with excellent performance at different operating ***-state batteries with the configuration S/L(small-sized SE in composite cathode and large-sized SE in electrolyte layer)show the best performance at room temperature(168 mA h g^(−1) at 0.2 C,retention of 99%,100 cycles)and−20°C(89 mA h g^(−1) at 0.05 C),while the configuration S/S displays better performance at elevated *** superior performance of S/L battery is associated with faster lithium-ion dynamics due to the better solid/solid interface between active materials and ***,the inferior performance at 60℃is caused by the formation of voids and cracks in the electrolyte layer during *** contrast,the S/S battery delivers superior performance at elevated operating temperature because of the integrated *** work confirms that tailoring electrolyte size has significant effect on fabricating all-climate solid-state batteries.

关键词： electrochemical performance lithium argyrodite operating temperature size distribution solid-state batteries

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