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SSRN 2023年

作者： Li, Lin Yao, Jingming Xu, Ruonan Yan, Xinlin Yu, Chuang Zhang, Long Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and Energy Fujian Normal University Fuzhou350117 China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and Technology Yanshan University Hebei Qinhuangdao066004 China Institute of Solid State Physics Vienna University of Technology Wiedner Hauptstr. 8-10 Vienna1040 Austria State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430000 China

The emerging halide solid electrolytes (SEs) possess superior (electro)chemical oxidation stabilities compared to sulfide SEs, but the understanding on their good compatibility toward oxide active materials needs to be further studied. Here, we develop a type of Zr-doped Na3YbCl6 chloride SEs. The optimized composition gains a high ionic conductivity and broad electrochemical oxidation window. The in situ EIS-DRT and ex situ XPS analyses verify that the chloride as ionic additives in the cathode is highly compatible with NaCrO2. Importantly, it is revealed that the volume change in the cathode can act a position effect on the microstructure evolution. It promotes to form a special core-shell-like structure with homogeneous chloride encapsulating NaCrO2 grains. Such a soft intimate contact promotes a uniform ion transport and mitigate electrochemo-mechanical stresses. The prerequisites generating this specific microstructure are proposed. The main capacity loss of the assembled ASSNBs only occurs at the initial 50 cycles, induced by the irreversible O3→O'3 phase transition in NaCrO2. The chloride additives with a soft feature and high oxidation-stability allow a high-quality interface in the oxide cathode and an excellent cycling stability of the ASSNBs. © 2023, The Authors. All rights reserved.

关键词： Solid electrolytes

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Irreversible Instability in Three-Phase Voltage-Source Converter Connected to Non-ideal Power Grid with Interacting Load

Irreversible Instability in Three-Phase Voltage-Source Conve...

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IEEE Energy Conversion Congress and Exposition

作者： Cheng Wany Meng Huang Chi K. Tse Siu-Chung Wong Xinbo Ruan Department of Electronic and Information Engineering The Hong Kong Polytechnic University Kowloon Hong Kong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467308021

Three-phase voltage source converters (VSC) are commonly used to convert ac power from a three-phase grid to a regulated dc voltage with unity input power factor. The control of the VSC is normally achieved by an outer voltage feedback loop and a sinusoidal pulse-width-modulated (SPWM) inner current loop. However, the non-ideal power grid and the presence of other interacting loads give rise to nonlinear operation and drive the VSC to enter an irreversible instability region. In this paper, the irreversible instability phenomenon in three-phase voltage-source converters is reported. The converter can also be regarded as exhibiting a catastrophic bifurcation in which the input current expands to cause undesirable component stress. A large-signal analysis is adopted to identify the physical origin of the phenomenon and to locate the boundary of the instability. The computed boundaries of the irreversible instability in the parameter space are verified though simulations. The phenomenon has been verified experimentally.

关键词： Three-Phase SPWM VSC

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A Method to Study the Influence of Background Magnetic Field on Magnetic Cores: Measurement, Parameter Identification and Discussion

SSRN

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SSRN 2023年

作者： Yang, Yong Wang, Shaoyu Zhu, Boliang Wang, Rumeng Lu, Yiwei Jiang, Li Zhang, Ming 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 Huazhong University of Science and Technology Wuhan430074 China State Grid Wuhan Power Supply Company Wuhan430013 China State Grid Henan Electric Power Research Institute Zhengzhou450001 China Institute of Plasma Physics Chinese Academy of Sciences Anhui230031 China

Magnetic components are naturally sensitive to external magnetic fields and susceptible to severe interference. This paper attempts to reveal the influence of the background magnetic field on magnetic cores based on experimental measurements of hysteresis loops and parameter identification of the Jiles–Atherton model. Firstly, the classical Jiles–Atherton model is used to quantitatively model the hysteresis loop, and an improved artificial bee colony algorithm is proposed for the parameter identification. Then, hysteresis loops of magnetic rings in four materials are measured in different background magnetic field intensities and orientations, and the variation patterns are verified by simulation. Finally, key physical quantities of hysteresis loops and parameters of the Jiles–Atherton model under different test conditions are obtained and identified, whose variation patterns are summarized and discussed. The main contribution of this paper is the proposal of a methodology to reveal the background magnetic field effects on magnetic cores. © 2023, The Authors. All rights reserved.

关键词： Magnetic cores

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Modularized small signal modelling method for DC grid

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical engineering 2016年第11期36卷 2880-2889页

作者： Lu, Xiaojun Lin, Weixing Wen, Jinyu Li, Yunfeng Wu, Yanan An, Ting State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology WuhanHubei Province430074 China Global Energy Interconnection Research Institute Changping District Beijing102211 China

A modularized small signal modelling method for DC grid was proposed. A DC grid is divided into AC network subsystems, converter subsystems and the DC network subsystem, where each converter subsystem is further divided into AC electrical module, DC electrical module, controller module, signal filtering module and phase lock loop module. Models of each subsystem and each module are interlinked through linking matrixes to form the overall small signal model of a DC grid. Small signal model of each module and the linking matrixes between different modules were derived. A generic control model based on control flag was proposed to model different typical VSC controllers using a same modelling structure. Linking matrixes between DC network and the converter systems were derived, an overall modelling matrix for DC grid was then presented. Accuracy of the proposed modelling method was verified on a 3-terminal HVDC system. Results show that for small disturbance, the small signal model is able to output almost identical simulation results as detailed electromagnetic model and nonlinear state-space model. The proposed modular modelling method and generic controller modelling method is able to significantly reduce the complexity of small signal modelling of DC grids. © 2016 Chin. Soc. for Elec. Eng.

关键词： Controllers

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Layer dependence of interlayer breathing and shear modes in ising ferromagnetic CrI3

arXiv

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arXiv 2019年

作者： Guo, Kai Deng, Bowen Shi, Zhongtai Li, Yue Wang, Xin Bi, Lei Zhang, Li Lu, Haipeng Zhou, Peiheng Zhang, Linbo Cheng, Yingchun Peng, Bo National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu611731 Key Laboratory of Flexible Electronics Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing211816 Department of Physics Broida Hall University of California Santa BarbaraCA93106-9530 Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education University of Electronic Science and Technology of China Chengdu611731

Long-range magnetic orders in atomically thin Ising ferromagnetic CrI3together with their promising electronic and optical properties give rise to new fascinating physics. However, to date, there has been no experimentally comprehensive understanding of the lattice dynamics in such 2D ferromagnets. Here, we report the layer, temperature and polarization dependence of Raman features in few-layer CrI3. The out-of-plane Ag(in-plane Eg) mode shifts to a higher (lower) frequency with an increased number of layers at 10 K. These modes simultaneously blueshift to higher energies due to phonon-phonon coupling as the temperature decreases from 200 to 60 K. Remarkably, a spin-phonon coupling emerges below 60 K (∼Tc), which causes an anomalous temperature-dependent behavior for both the Ag and Eg mode. The Ag(Eg) mode maintains (reverses) the helicity of incident light at 10 K, which is independent of the magnetic field and originates from the phonon symmetry. Our work provides insights into the spin-phonon coupling and lattice dynamics of Ising ferromagnets. Copyright © 2019, The Authors. All rights reserved.

关键词： Ferromagnetism

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Triggering of tearing instability by impurity radiation through resistive interchange reversal in a tokamak

arXiv

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arXiv 2022年

作者： Zeng, Shiyong Zhu, Ping Zhou, Ruijie Escande, Dominique Frank Department of Plasma Physics and Fusion Engineering University of Science and Technology of China Anhui Hefei230026 China 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 Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Institute of Plasma Physics Chinese Academy of Sciences Anhui Hefei230031 China Aix-Marseille University CNRS PIIM UMR 7345 Marseille France

Recent MHD simulations find that the reversal of the local resistive interchange parameter DR from negative to positive due to impurity radiation cooling is able to trigger the resistive tearing mode growth in a tokamak above a threshold in impurity level. A layer of perturbed Pfirsch-Schlüter current density and resistivity are also induced by the impurity radiation, which further govern the tearing mode growth and saturation in the nonlinear stage. The impurity threshold and the tearing mode growth strongly depend on the parallel thermal conductivity, and such a dependence derives from the impact on DR of the fast parallel thermal equilibration along the helical magnetic field lines. Copyright © 2022, The Authors. All rights reserved.

关键词： Thermal conductivity

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Electrical Characteristics of the GEC Reference Cell with Impedance Matching: A Two-Dimensional PIC/MCC Modeling Study

arXiv

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arXiv 2023年

作者： Chen, Zili Wang, Hongyu Yu, Shimin Wang, Yu Chen, Zhipeng Jiang, Wei Schulze, Julian Zhang, Ya State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China School of Physics Science and Technology Anshan Normal University Anshan114007 China School of Physics Huazhong University of Science and Technology Wuhan430074 China Department of Applied Electrodynamics and Plasma Technology Faculty of Electrical Engineering and Information Sciences Ruhr University Bochum Bochum44801 Germany Department of Physics Wuhan University of Technology Wuhan430070 China

In this paper, the electrical characteristics of the Gaseous Electronics Conference (GEC) reference cell with impedance matching are investigated through a two-dimensional electrostatic implicit Particle-in-Cell/Monte Carlo Collision (PIC/MCC) model in an axisymmetric coordinate system. The coupling between the complex reactor geometry and the external circuit is included via an equivalent capacitance calculated from the electric energy density. The results of this model are compared with experimental measurements and other model calculations and show good agreement. This simulation obtains the plasma kinetics of the capacitively coupled discharge process at low pressure and detailed external circuit responses, including power transmission, reflection, and higher-order harmonics in the circuit, which provides important insights for impedance-matching design in semiconductor plasma processing. Copyright © 2023, The Authors. All rights reserved.

关键词： Electric discharges

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Commissioning of two RF operation modes for RF negative ion source experimental setup at HUST

引用

AIP Conference Proceedings 2017年第1期1869卷

作者： D. Li D. Chen K. Liu P. Zhao C. Zuo X. Wang H. Wang L. Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

An RF-driven negative ion source experimental setup, without a cesium oven and an extraction system, has been built at Huazhong University of Science and technology (HUST). The working gas is hydrogen, and the typical operational gas pressure is 0.3 Pa. The RF generator is capable of delivering up to 20 kW at 0.9 - 1.1 MHz, and has two operation modes, the fixed-frequency mode and auto-tuning mode. In the fixed-frequency mode, it outputs a steady RF forward power (Pf) at a fixed frequency. In the auto-tuning mode, it adjusts the operating frequency to seek and track the minimum standing wave ratio (SWR) during plasma discharge. To achieve fast frequency tuning, the RF signal source adopts a direct digital synthesizer (DDS). To withstand high SWR during the discharge, a tetrode amplifier is chosen as the final stage amplifier. The trend of maximum power reflection coefficient |ρ|2 at plasma ignition is presented at the fixed frequency of 1.02 MHz with the Pf increasing from 5 kW to 20 kW, which shows the maximum |ρ|2 tends to be “steady” under high RF power. The experiments in auto-tuning mode fail due to over-current protection of screen grid. The possible reason is the relatively large equivalent anode impedance caused by the frequency tuning. The corresponding analysis and possible solution are presented.

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Highly reproducible surface-enhanced Raman scattering substrate for detection of phenolic pollutants

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Nanotechnology 2016年第45期27卷 455301页

作者： Zeng, Zhiqiang Tang, Dan Liu, Liwei Wang, Yin Zhou, Qingwei Su, Shaoqiang Hu, Die Han, Bing Jin, Mingliang Ao, Xianyu Zhan, Runze Gao, Xingsen Lu, Xubing Zhou, Guofu Senz, Stephan Zhang, Zhang Liu, Junming Institute for Advanced Materials Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials South China Normal University Guangzhou510006 China State Key Laboratory of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and Technology School of Physics and Engineering Sun Yat-sen University Guangzhou510275 China Centre for Optical and Electromagnetic Research South China Academy of Advanced Optoelectronics South China Normal University Guangzhou510006 China Laboratory of Solid State Microstructures Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Electronic Paper Display Institute South China Academy of Advanced Optoelectronics South China Normal University Guangzhou510006 China Max Planck Institute of Microstructure Physics Weinberg 2 HallesD-06120 Germany

The ordering degree of nanostructures is the key to determining the uniformity of surface-enhanced Raman scattering (SERS). However, fabrication of large-area ordered nanostructures remains a challenge, especially with the ultrahigh-density (>1010 cm-2). Here, we report a fabrication of large-area ultrahigh-density ordered Ag@Al2O3/Ag core-shell nanosphere (NS) arrays with tunable nanostructures. The ultrahigh-density (2.8 ×1010 cm-2) ordered NS arrays over a large-area capability (diameter >4.0 cm) enable the uniform SERS signals with the relative standard deviation of less than 5%. The as-fabricated highly reproducible SERS substrate can be applied to detect trace phenolic pollutants in water. This work does not only provide a new route for synthesizing the ultrahigh-density ordered nanostructures, but also create a new class of SERS substrates with high sensitivity and excellent reproducibility. © 2016 IOP Publishing Ltd.

关键词： Aluminum oxide

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A unified dynamic phasor modeling and operating characteristic analysis of electrical system of MMC

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical engineering 2016年第20期36卷 5479-5491页

作者： Lu, Xiaojun Lin, Weixing An, Ting Li, Yunfeng Wen, Jinyu Yao, Wei State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology WuhanHubei Province430074 China Global Energy Interconnection Research Institute Changping District Beijing122000 China

A unified dynamic phasor model (DPM) for electrical system of modular multilevel converter (MMC) under the rotating frame was proposed. The model considers the AC voltage components in the rotating frame and the DC voltage as electrical inputs, takes the fundamental frequency and second harmonic components of modulation indices as the control inputs. By individually modeling the controller, the internal dynamics of MMC and the dynamics of external electrical system, the proposed dynamic phasor model is capable of conveniently interconnecting models of MMC electrical dynamics, controllers and external electrical system. The dynamic phasor model of MMC was therefore normalized. By setting the derivative terms in the DPM to zero, static phasor model for the electrical system of MMC was achieved. By linearizing the DPM around the steady-state operating point, small signal model for the electrical system of MMC was obtained. As a result, the proposed DPM unified the dynamic phasor model, static phasor model and small signal model of MMC. Based on the obtained static phasor model of the MMC, an open loop circulating current suppressing control (CCSC) strategy and a method of analytically analyzing the operating characteristic of MMC considering various constraints were proposed. Simulations on PSCAD/EMTDC verified the accuracy of the dynamic phasor model, the efficacy of the open loop CCSC strategy and the different constraints on the PQ operation zone of a MMC. © 2016 Chin. Soc. for Elec. Eng.

关键词： Controllers

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