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Optimal Allocation and Two-Level Control of Reactive Power for Balancing Voltage and Power Factor of Renewable Energy Stations

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IEEE Transactions on Sustainable Energy 2025年

作者： Zhang, Xinhao Zhou, Hongyu Yao, Wei Xiong, Yongxin Ruan, Yimin Xiao, Bitao Wen, Jinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China The Hong Kong Polytechnic University Department of Electrical and Electronic Engineering 999077 Hong Kong Guodian Nanjing Automation Co. Ltd. Nanjing210032 China

Renewable energy stations(RES) must satisfy voltage security and power factor requirements for safe and efficient operation. However, these requirements often conflict, posing challenges in practical applications. This paper first analyzes the constraints and identifies the boundary of RES voltage regulation capability under power factor constraints. Building on the analysis, an optimal allocation and two-level control (TLC) of reactive power is proposed. It integrates the optimization of reactive power compensator (RPC) with the coordinated control of reactive resources, thereby balancing voltage regulation and power factor. From the allocation perspective, an RPC optimization method is proposed to maximize the feasible voltage range of RES under varying active power conditions of RES. From the control perspective, a TLC scheme is proposed, combining station and unit control. At the station level, the controller features a mode-switching function and calculates the overall reactive power reference value. At the unit level, the controller coordinates the converter-interfaced generations (CIGs) and RPC. Case studies are conducted on a real RES project in Bazhou, Xinjiang, China. Matlab/Simulink and Opal-RT real-time simulation results demonstrate that the proposed method enhances both voltage security and economic efficiency. © 2010-2012 IEEE.

关键词： Solar fuels

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New Current Control Method of DC Power Supply for Magnetic Perturbation Coils on J-TEXT

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Plasma Science and technology 2014年第11期16卷 1074-1078页

作者：曾武兵丁永华易斌许航宇饶波张明刘明海 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

In order to advance the research on suppressing tearing modes and driving plasma rotation, a DC power supply （PS） system has been developed for dynamic resonant magnetic perturbation （DRMP） coils and applied in the J-TEXT experiment. To enrich experimental phe- nomena in the J-TEXT tokamak, applying the circulating current four-quadrant operation mode in the DRMP DC PS system is proposed. By using the circulating current four-quadrant oper- ation, DRMP coils can be smoothly controlled without the dead-time when the current polarity reverses. Essential circuit analysis, control optimization and simulation of desired scenarios have been performed for normal current. Relevant simulation and test results are also presented.

关键词： DRMP power supply （PS） J-TEXT four-quadrant operation

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Equilibrium Reconstruction and Its Integration in J-TEXT

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Plasma Science and technology 2016年第7期18卷 786-790页

作者：张帆徐涛孙新锋张晓卿庄革简翔 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

The equilibrium fitting code （EFIT） and its application in the J-TEXT tokamak are integrated by the Matlab language. The function of analysis and visualization to the results is added. In addition, the experiment data measured by soft X-ray （SXR） are used to calculate plasma equilibrium as a constraint condition. The improved EFIT code is used for J-TEXT discharge and the profiles of plasma parameters such as flux function, safety factor q, pressure and current density are obtained from the reconstructed configurations.

关键词： EFIT integrated operation equilibrium reconstruction

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Plasma Response to Supersonic Molecular Beam Injection in J-TEXT

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Plasma Science and technology 2014年第1期16卷 17-20页

作者：肖金水杨州军庄革胡启明冯先德刘明海 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Recently, hydrogen fueling experiments with supersonic molecular beam injection （SMBI） system have been performed in the J-TEXT tokamak. To evaluate the effects of the in- jection amount of SMBI on plasma behaviors, moderate and intensive SMBs have been separately injected and compared with each other in Ohmic discharges. With moderate SMBs, electron den- sity increases about twice as before, the size of magnetic island slightly decreases, and the edge toroidal rotation speed in a counter-current direction, measured by a high resolution spectrometer （Carbon V ion, 227.09 nm, r/a-= 0.7-0.8）, is accelerated from 8 km/s to 12 km/s. The state of higher electron density with moderate SMBI can be maintained for a long period, which indicates that plasma confinement is improved. However, with intensive SMBs, the accompanied magne- tohydrodynamic （MHD） activities are triggered, and the electron density increases moderately. The edge toroidal velocity is decreased, in certain cases even reversed in the co-current direction. The statistical result of experimental data for moderate and intensive SMBs suggests a preferred fueling amount （less than 3.2 ~ 1019） to improve the SMBI fueling efficiency in experiments.

关键词： SMBI fuelling plasma responses J-TEXT

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Nonvolatile bistable planar Hall effects in a natural two-dimensional metal–antiferromagnet heterostructure

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Physical Review B 2025年第15期111卷 155437-155437页

作者： Minjie Zhang Xinxi Liu Yuqiang Huang Qifeng Hu Jiayi Lu Hui Xing Dawei Shen Bin Lu Yunhao Lu Kenji Watanabe Takashi Taniguchi Guang-Han Cao Yi Zheng School of Physics and State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University Hangzhou 310027 China Key Laboratory of Artificial Structures and Quantum Control and Shanghai Center for Complex Physics School of Physics and Astronomy Shanghai Jiao Tong University Shanghai China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 China State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan

Antiferromagnetic materials with van der Waals (vdW) layered structures hold great promises for developing the next generation of electronic and optoelectronic devices, providing unique combinations of terahertz spin dynamics, ultrastability against magnetic fields disturbance, and low power consumption. Here, we demonstrate unconventional nonvolatile bistable planar Hall effect (PHE) in few-layer GdTe3, a natural vdW heterostructure consisting of metallic Te layers and antiferromagnetic (AFM) GdTe bilayers. By fully unfolding the magnetic phase diagram of few-layer GdTe3 utilizing temperature- and angle-dependent magnetotransport measurements, we identify that the nonvolatile switching of bistable PHE states is rooted in the fourfold Néel vector flipping between two perpendicular in-plane magnetocrystalline anisotropy axes, each flipping reverses the signs of the PHE state. The efficient magnetic field (H) write-in and zero-field read out of the PHE memory pave the way for 2D AFM-based spintronics such as nonvolatile information storage and logic operations.

关键词： Antiferromagnetic materials

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Optimization of the lattice function in the planar undulator applied for terahertz FEL oscillators

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Chinese Physics C 2014年第3期38卷 72-77页

作者：杨磊秦斌杨军刘遐龄谭萍胡桐宁 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Since the beta function of the electron beam within the undulator has a great influence on the power gain of the free electron laser（FEL）,optimization of the undulator lattice becomes *** this paper,the transfer matrix of the planar undulator is obtained from differential equations of the electron *** on this,the lattice function of the planar undulator in a terahertz FEL oscillator proposed by Huazhong University of Science and technology（HUST-FEL） is optimized and the expressions of the average beta function are *** accuracy of the optimization result was confirmed well by the numerical *** application range of this analytical method is given as *** last,the emittance growth in the horizontal direction due to the attenuation of the magnetic field is discussed.

关键词： planar undulator beam transport lattice optimization

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Interaction analysis between induction motor loads and STATCOM in weak grid using induction machine model

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Journal of Modern Power Systems and Clean Energy 2018年第1期6卷 158-167页

作者： Ding WANG Xiaoming YUAN State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Static synchronous compensators(STATCOM)can be used as a reactive power compensation for induction motor(IM)loads due to its effective control and good *** voltage control(TVC)in a STATCOM has a great influence on voltage dynamics which is a significant concern in a system with many IM *** paper investigates the interaction between IM loads and TVC in a STATCOM under weak grid conditions from the viewpoint of active and reactive power flow.A corresponding induction machine model is proposed,based on which the interaction mechanism between IM loads and TVC in a STATCOM can be intuitively *** is shown that the negative damping component provided by TVC in a STATCOM can lead to system oscillation *** strength and the inertia constant of the induction machine affect the extent of such ***-domain simulation results of IM loads connected to an infinite system through a long transmission line,with STATCOM compensation implemented in MATLAB/Simulink,validate the correctness of the analyses.

关键词： Induction machine Small signal stability Static synchronous compensator(STATCOM) Terminal voltage control Weak grid

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Neural Network Prediction of Disruptions Caused by Locked Modes on J-TEXT Tokamak

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Plasma Science and technology 2013年第11期15卷 1154-1159页

作者：丁永华金雪松陈真真庄革 State Key Laboratory of Advanced Electromagnetic Engineering and Technology College of Electrical and Electronic Engineering Huazhong University of Science and Technology

Prediction of disruptions caused by locked modes using the Back-Propagation （BP） neural network is completed on J-TEXT tokamak. The network, which is based on the BP neural network, uses Mirnov coils and locked mode coils signals as input data, and outputs a signal including information of prediction of locked mode. The rate of successful prediction of locked modes is more than 90%. For intrinsic locked mode disruptions, the network can give a prewarning signal about 1 ms ahead of the locking-time. For the disruption caused by resonant magnetic perturbation （RMPs） locked modes, the network can give a prewarning signal about 10 ms ahead of the locking-time.

关键词： disruption locked mode BP neural network prediction

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Enhanced dynamo drive for the sawtooth relaxation process due to non-uniform resistivity distribution in a reversed field pinch

arXiv

引用

arXiv 2025年

作者： Yan, Wentan Zhu, Ping Li, Hong Liu, Wandong Luo, Bing Li, Haolong KTX Laboratory Department of Plasma Physics and Fusion Engineering University of Science and Technology of China Anhui Hefei230026 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Nuclear Engineering and Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Hunan Province Key Laboratory Integration and Optical Manufacturing Technology College of Mathematics and Physics Hunan University of Arts and Science Hunan Changde415000 China Department of Physics School of Science Tianjin University of Science and Technology Tianjin300457 China

In this work, we use the three-dimensional resistive MHD code NIMROD to investigate the impact of resistivity inhomogeneity on the sawtooth process of an reversed field pinch (RFP) plasma. The simulation employs a non-uniform resistivity profile similar to experiments, which monotonically increases from the core to the edge as the temperature decreases. The resistivity inhomogeneity introduces an additional electric field in the plasma, which accelerates the inward diffusion of magnetic flux and changing the self sustained reversal state, hence significantly enhances the dynamo effect and the sawtooth process in the RFP plasma. Copyright © 2025, The Authors. All rights reserved.

关键词： Electric fields

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Advancing the understanding and prediction accuracy of molecular adsorption energy with artificial intelligence

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Physical Review B 2025年第19期111卷 195413-195413页

作者： Wen Liu Ning Xu Zheng Li Meiliang Ma Xiaojuan Hu Zhong-Kang Han Ying Jiang Wentao Yuan Hangsheng Yang Sergey V. Levchenko Yong Wang Center of Electron Microscopy and State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China Skolkovo Institute of Science and Technology Bolshoy Boulevard 30/1 Moscow 121205 Russia

Molecular adsorption plays a key role in heterogeneous catalysis, with the d-band center theory being extensively utilized for qualitative analysis of adsorption behavior of molecules on transition-metal surfaces. However, adsorption energies predicted by d-band center theory can have large errors, especially when a wide range of metals is considered. The physical mechanism responsible for the deviation has been unclear, posing significant challenges of the precise design of catalysts. Here, we have integrated density-functional theory calculations with artificial intelligence approaches to develop a unifying model that quantitatively evaluates the adsorption energy of water on various transition-metal surfaces. Data mining revealed that the large deviations between the d-band center theory predictions and first-principles calculations primarily stem from surface relaxation effects. Additionally, we discovered that the synergistic effects of electron donation and back donation, which are mediated by the d and p orbitals in metals, also play a role in these deviations, although their impact is less significant compared to that of the surface relaxation. These findings enhance our understanding of molecular adsorption behavior and are poised to influence research fields such as surface science and heterogeneous catalysis.

关键词： Density functional theory

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