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Ground-state mass of ^(22)Al and test of state-of-the-art ab initio calculations

Chinese Physics C 2024年第3期48卷 72-78页

作者：孙铭泽于越王新鹏王猛李健国张玉虎 K.Blaum 陈祖毅陈瑞九邓涵宇付超义葛文文黄文嘉焦红扬李红蕙李宏福罗胤芳廖挺 YuALitvinov 司敏帅鹏史金阳王茜邢元明徐星徐瑚珊许甫荣袁琪 T.Yamaguchi 颜鑫亮杨建成原有进周小红周旭张敏曾奇 CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Max-Planck-Institut für Kernphysik Saupfercheckweg 169117 HeidelbergGermany GSI Helmholtzzentrum für Schwerionenforschung Planckstraße 164291 DarmstadtGermany Advanced Energy Science and Technology Guangdong Laboratory Huizhou516007China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Department of Physics Saitama UniversitySaitama 338-8570Japan School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

The ground-state mass excess of the T_(z)=−2 drip-line nucleus ^(22)Al is measured for the first time as 18103(10)keV using the newly-developed Bρ-defined isochronous mass spectrometry method at the cooler storage ring in *** new mass excess value allowed us to determine the excitation energies of the two low-lying 1+states in ^(22)Al with significantly reduced uncertainties of 51 *** compared to the analogue states in its mirror nucleus ^(22)F,the mirror energy differences of the two 1^(+)states in the ^(22)Al-^(22)F mirror pair are determined to be−625(51)keV and−330(51)*** excitation energies and mirror energy differences are used to test the state-of-the-art ab initio valence-space in-medium similarity renormalization group calculations with four sets of interactions derived from the chiral effective field *** mechanism leading to the large mirror energy differences is investigated and attributed to the occupation of theπs_(1/2) orbital.

关键词： nuclear mass Bρ-defined IMS mirror energy difference ab initio VS-IMSRG calculations chiral interactions

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Transient Synchronization Stability Mechanism of PMSG With Additional Inertia Control

TechRxiv

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TechRxiv 2023年

作者： Zhang, Yayao Zhan, Meng The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

Synchronous stability is crucial for the safety and operation of AC power systems. However, most of the current researches focused on the stability of grid-connected converters, and that of renewable equipment still lacked. In this paper, the impact of the additional inertia control (AIC) on the permanent magnet synchronous generator (PMSG) is studied. It is found that with the AIC, the system dominant dynamics shifts from the electromagnetic to electromechanical timescales. This paper develops a simplified model for the single-PMSG infinite-bus system with the AIC within the electromechanical timescale, and reveals the transient synchronization stability mechanism from three aspects: the machine-network interface, transient dominant variable, and interaction between the synchronous loop and the power imbalance loop. Finally, this paper analyzes the swing characteristics of the PMSG system, and uncovers the relationship between the energy transmission and synchronization. These findings could provide improved insights into the synchronous stability mechanism of renewable-dominated new-type power systems. © 2023, CC BY-NC-SA.

关键词： Transients

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Investigation of electron cyclotron current drive efficiency on the J-TEXT tokamak

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Plasma Science and technology 2022年第12期24卷 183-189页

作者： Jiangang FANG Wei YAN Zhongyong CHEN Xiaobo ZHANG Xixuan CHEN Junli ZHANG Feiyue MAO You LI Lingke MOU Yu ZHONG Feng Li Weikang ZHANG Fanxi LIU Guinan ZOU Song ZHOU Da LI Li GAO Donghui XIA Zhoujun YANG Zhipeng CHEN Nengchao WANG Yonghua DING Yunfeng LIANG Yuan PAN 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 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikD-52425 JülichGermany

Electron cyclotron current drive(ECCD) efficiency research is of great importance for the neoclassical tearing mode(NTM) *** ECCD efficiency is beneficial for the NTM stabilization and the ECCD power threshold *** efficiency has been investigated on the J-TEXT *** electron cyclotron wave(ECW) power scan was performed to obtain the current drive *** current drive efficiency is derived to be approximately η_(0)=(0.06-0.16)×10^(19)A m^(-2)W^(-1)on the J-TEXT *** effect of the residual toroidal electric field has been included in the determination of the current drive efficiency,which will enhance the ECCD *** the plasma current of I_(p)=100 kA and electron density of n_(e)=1.5×10^(19)m^(-3),the ratio of Spitzer conductivity between omhic(OH)and ECCD phases is considered and the experimental data have been *** correction results show that the current drive efficiency η_(1)caused by the fast electron hot conductivity decreases by approximately 79%.It can be estimated that the driven current is approximately 24 kA at 300 kW ECW power.

关键词： electron cyclotron current drive current drive efficiency residual toroidal electric field

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Influence of Grounded Shield on Cable Broadband Impedance Spectroscopy Measurement

Influence of Grounded Shield on Cable Broadband Impedance Sp...

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Electrical engineering, Control and Robotics (EECR), International Conference on

作者： Xuebin Ye Dandan Zhang Shi Mo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

Fast and accurate cable fault detection is the key to reduce economic losses and improve electrical system reliability. Broadband impedance spectroscopy (BIS) is a new type of cable fault location technology, but the application of BIS technology in the actual field is still less. In particular, the grounding of cable shield in actual operation is lack of consideration is one of the reasons. In view of the grounding situation which widely occurs in the actual cable, this paper analyzes the influence of the cable shield grounding on the measuring circuit, and carries out the measurement experiments of different grounding conditions under the open and short circuit faults at the terminal of the cable. The results show that the grounding of the cable shield does not affect the accuracy of the BIS data. This simplifies the operation and reduces the risk of electric shock during the measurement, which has positive significance for the application of BIS technology in practice.

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A high-resistance unbalance fault identification method for high-proportion new energy access system 12

A high-resistance unbalance fault identification method for ...

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12th IET International Conference on Advances in Power System Control, Operation and Management, APSCOM 2022

作者： Liu, Dan Kang, Yiqun Xiao, Fan Xiong, Ping Cao, Kan Yan, Jindong Wen, Minghao Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781839538513

With the large number of power electronic power sources such as wind power, photovoltaic power, energy storage connected to the grid, the degree of electric power electronic system gets higher and higher. The fault characteristics of power electronic power supply and synchronous generator are obviously different. When unbalance fault occurs in transmission line especially in the case of high transition resistance, the zero-sequence current will be so small that the zero-sequence overcurrent protection of the line fails to operate, which brings great challenges to the traditional relay protection. In this paper we analyzed the adaptability of traditional zero-sequence protection in different working conditions under the background of typical high-proportion new energy grid engineering, and a high-sensitivity protection principle for unbalance faults of high-proportion new energy access system is proposed. On the basis of traditional zero-sequence overcurrent protection, the protection sensitivity is improved by combining zero-sequence voltage criteria. Considering that the zero-sequence current and zero-sequence voltage criteria may not be sensitive enough under high resistance fault conditions, and the limiting link of some systems will also reduce the fault current, the three-phase voltage specific unbalance is defined to reflect the characteristics of the fault. The voltage specific unbalance fits the voltage characteristics well when unbalance fault occurs in transmission line. In theory the results are very accurate when the fault is identified by the voltage specific unbalance. In order to avoid the influence of phasor extraction algorithm of power frequency, the proposed method uses modulus values of voltage and current instantaneous values in one power frequency period to replace the power frequency phasor. We have verified that the proposed method has a good ability to identify faults with high transition resistance especially when dealing with unbalance fau

关键词： Overcurrent protection

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Modulation Strategy for Cascaded DC/DC Converter through Integration of CLLLC and Six-Switch Buck-Boost Topology

Modulation Strategy for Cascaded DC/DC Converter through Int...

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PELS Students and Young Professionals Symposium (SYPS), IEEE

作者： Erya Qu Yu Zhang Meng He 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

This paper proposes a cascaded DC/DC converter which integrates the six-switch Buck-Boost circuit with CLLLC converter by sharing a bridge arm and shows advantages of bidirectional energy flow, high voltage rating, high efficiency and wide input voltage range. First, an alternative PWM strategy (APWM) for the six-switch Buck-Boost circuit is proposed to balance its flying capacitor voltage. Next, a control method for both current ripple optimization and power control (CRO-PC) is proposed which can reduce 73.5% of current ripple. Finally, a 2 kW/ 20 kHz prototype was built to demonstrate the performance of the proposed method.

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Feature Extraction of Ultrasonic Monitoring during Lithium-ion Battery Cycling 7

Feature Extraction of Ultrasonic Monitoring during Lithium-i...

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7th IEEE International Conference on Power and Renewable Energy, ICPRE 2022

作者： Xu, Maoshu Zou, Binchen Shen, Yi Wang, Kangli Jiang, Kai Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China Huazhong University of Science and Technology School of Materials Science and Engineering Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665450638

ISBN: (纸本)9781665450638

Ultrasonic monitoring is a promising method for state estimation and aging characterization in the battery field. Three feature extraction methods focusing on different ultrasonic wave parts during battery cycling are proposed, and each of which has a strong linear correlation with the state of charge. The Principal Components Analysis, which utilizes the entire ultrasonic wave including oscillatory wave and "first echo", extracts the best performing features, improves the resolution of ultrasonic monitoring in the state of charge estimation, and demonstrates the powerful capabilities of ultrasonic monitoring in battery management applications. © 2022 IEEE.

关键词： Feature extraction

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Temperature Field Analysis and Optimal Design of Axial Flux Permanent Magnet Motor Based on Fluid-Solid Coupling

Temperature Field Analysis and Optimal Design of Axial Flux ...

引用

IEEE International Conference on Power and Power and Renewable Energy (ICPRE)

作者： Haoyu Kang Yiming Song Jin Wang Libing Zhou State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China AECC Hunan Aviation Powerplant Research Institute Zhuzhou China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

With its compact spatial structure and high power density, the axial flux permanent magnet motor is suitable for specialized applications but also imposes higher cooling requirements. It necessitates a well-designed rotor cooling structure to ensure reliable motor operation. This paper uses a 7kW dual-stator single-rotor axial flux permanent magnet motor as an example. Based on the principle of fluid-solid coupling, the motor's three-dimensional fluid field and temperature field models are established to study the impact of different rotor structures on the motor's heat dissipation capability. The research results indicate that the permanent magnets exhibit the highest temperature rise in a dual-stator single-rotor axial flux permanent magnet motor. By more effectively agitating the air around the permanent magnets and increasing the heat dissipation area of the permanent magnets, the motor's cooling capacity can be improved. Specifically, thinning the rotor support structure can effectively suppress the temperature rise of the permanent magnets.

关键词： Heating systems Couplings Solid modeling Temperature distribution Fluids Cooling Rotors Permanent magnet motors Permanent magnets Stress

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Pressureless all-solid-state Na/S batteries with self-supporting Na_(5)YSi_(4)O_(12) scaffolds

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Carbon Energy 2023年第12期5卷 97-110页

作者： Aikai Yang Ruijie Ye Huimin Song Qiongqiong Lu Xingchao Wang Enkhtsetseg Dashjav Kai Yao Daniel Grüner Qianli Ma Frank Tietz Olivier Guillon Forschungszentrum Jülich GmbH Institute of Energy and Climate Research(IEK-1)JülichGermany Institute of Mineral Engineering(GHI) RWTH Aachen UniversityAachenGermany Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials School of Materials Science and EngineeringPeking UniversityBeijingChina Institute of Materials Henan Academy of SciencesZhengzhouHenanChina Henan Key Laboratory of Advanced Conductor Materials ZhengzhouHenanChina State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources Key Laboratory of Advanced Functional MaterialsAutonomous RegionInstitute of Applied ChemistryCollege of ChemistryXinjiang UniversityUrumqiXinjiangChina Forschungszentrum Jülich GmbH Institute of Energy and Climate Research(IEK-2)JülichGermany Jülich Aachen Research Alliance JARA-EnergyJülichGermany

The development of reliable and affordable all-solid-state sodium metal batteries(ASS-SMBs)requires suitable solid-state electrolytes with cost-efficient processing and stabilized electrode/electrolyte ***,an integrated porous/dense/porous Na_(5)YSi_(4)O_(12)(NYS)trilayered scaffold is designed and fabricated by tape casting using aqueous *** this template-based NYS scaffold,the dense layer in the middle serves as a separator and the porous layers on both sides accommodate the active materials with their volume changes during the charge/discharge processes,increasing the contact area and thus enhancing the utilization rate and homogenizing the current *** Na/NYS/Na symmetric cells with the Pb-coated NYS scaffold exhibit significantly reduced interfacial impedance and superior critical current density of up to 3.0 mA cm^(-2)against Na metal owing to enhanced ***,the assembled Na/NYS/S full cells operated without external pressure at room temperature showed a high initial discharge capacity of 970 mAh g^(-1)and good cycling stability with a capacity of 600 mAh g^(-1)after 150 cycles(based on the mass of sulfur).This approach paves the way for the realization of economical and practical ASS-SMBs from the perspective of ceramic manufacturing.

关键词： Na/S batteries Na_(5)YSi_(4)O_(12) scaffold solid-state electrolytes tape casting

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Cooperative Control Scheme of Large-scale Distributed PV Grid-connected Systems for Frequency Regulation Based on DC Optimizers 10

Cooperative Control Scheme of Large-scale Distributed PV Gri...

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10th Renewable Power Generation Conference, RPG 2021

作者： Wang, Qin Yao, Wei Fang, Jiakun Xu, Mengyao Ai, Xiaomeng Wen, Jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781839536069

With the growing proportion of photovoltaic (PV) generation in power systems, DC optimizers (DCOs) based distributed MPPT technologies are recently developed to mitigate the waste of solar energy due to the partial shadow in PV arrays. However, incorporating a large scale of PV capacity into power systems requires frequency regulation enhancement due to the reduced system inertia and PV power fluctuations. In this paper, a novel coordination control strategy for unit-level DCOs and grid-connected inverter is proposed to provide active frequency support from PV units. The proposed control scheme combines the f-P droop control for the power generation of PV-DCO units and the virtual inertia emulation for the DC-link capacitor of the voltage source inverter (VSI), to realize a communication-free cooperative control strategy between large-scale PV systems and grid systems. After that, a flexible power reserve for PV systems is achieved with the improvement of the rate of change of frequency (RoCoF), the frequency nadir, and the steady-state frequency deviation during under/over-frequency events in power systems. Case studies are performed to validate the effectiveness of the proposed control strategy. © The Institution of engineering and technology.

关键词： Solar energy

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