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Nonsingular Terminal Sliding Mode Control for Speed Regulation of Permanent Magnet Synchronous Motor with Parameter Uncertainties and Torque Change

Nonsingular Terminal Sliding Mode Control for Speed Regulati...

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International Conference on Electrical Machines and Systems

作者： Wei Xu Yajie Jiang Chaoxu Mu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China School of Electrical and Automation Engineering Tianjin University Tianjin China

ISBN: (纸本)9781479988068

This paper mainly studies the speed control for a permanent magnet synchronous motor (PMSM) system with parameters uncertainties and torque change. PMSM is a typical nonlinear multivariable coupled system, and is sensitive to the load disturbance and the changing of motor parameters. Hence, the drive performance of PMSM is deteriorated when faced with all kinds of disturbances. A new control algorithm based on nonsingular terminal sliding mode control (NTSMC) is designed to replace the traditional sliding mode control (SMC) in this paper, which can provide effective control for the speed regulation of PMSM servo system with parameter uncertainties and torque change. The high performance in simulation results are proposed to verify the effectiveness of this proposed method.

关键词： PMSM NTSMC SMC

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Mechanically reprogrammable Pancharatnam-Berry metasurface for microwaves

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advanced Photonics 2022年第1期4卷 69-79页

作者： Quan Xu Xiaoqiang Su Xueqian Zhang Lijuan Dong Lifeng Liu Yunlong Shi Qiu Wang Ming Kang Andrea Alù Shuang Zhang Jiaguang Han Weili Zhang Tianjin University Center for Terahertz Waves and College of Precision Instrument and Optoelectronics EngineeringKey Laboratory of Optoelectronic Information Technology(Ministry of Education of China)TianjinChina Shanxi Datong University Institute of Solid State Physics and College of Physics and Electronic ScienceShanxi Province Key Laboratory of Microstructure Electromagnetic Functional MaterialsDatongChina Wuhan University of Technology School of Information EngineeringWuhanChina Tianjin Normal University College of Physics and Materials ScienceTianjinChina City University of New York Advanced Science Research CenterPhotonics InitiativeNew YorkUnited States City University of New York Graduate CenterPhysics ProgramNew YorkUnited States University of Hong Kong Faculty of ScienceDepartment of PhysicsHong KongChina University of Hong Kong Department of Electrical and Electronic EngineeringHong KongChina Guilin University of Electronic Technology Guangxi Key Laboratory of Optoelectronic Information ProcessingSchool of Optoelectronic EngineeringGuilinChina Oklahoma State University School of Electrical and Computer EngineeringStillwaterOklahomaUnited States

Metasurfaces have enabled the realization of several optical functionalities over an ultrathin platform,fostering the exciting field of flat *** metasurfaces are achieved by arranging a layout of static meta-atoms to imprint a desired operation on the impinging wavefront,but their functionality cannot be *** and programmability of metasurfaces are the next important step to broaden their impact,adding customized on-demand functionality in which each meta-atom can be individually *** demonstrate a mechanical metasurface platform with controllable rotation at the meta-atom level,which can implement continuous Pancharatnam–Berry phase control of circularly polarized *** the proof-of-concept experiments,we demonstrate metalensing,focused vortex beam generation,and holographic imaging in the same metasurface template,exhibiting versatility and superior *** dynamic control of electromagnetic waves using a single,low-cost metasurface paves an avenue towards practical applications,driving the field of reprogrammable intelligent metasurfaces for a variety of applications.

关键词： reprogrammable metasurfaces Pancharatnam-Berry phase mechanical metasurfaces microwaves

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Target-Oriented WiFi Sensing for Respiratory Healthcare: from Indiscriminate Perception to In-Area Sensing

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IEEE Network 2024年

作者： Wang, Meng Huang, Jinyang Zhang, Xiang Liu, Zhi Li, Meng Zhao, Peng Yan, Huan Sun, Xiao Dong, Mianxiong Hefei University of Technology Anhui Province Key Laboratory of Affective Computing and Advanced Intelligence Machine School of Computer and Information Hefei230601 China University of Science and Technology of China CAS Key Laboratory of Electromagnetic Space Information Hefei230026 China The University of Electro-Communications Department of Computer and Network Engineering Tokyo1828585 Japan Guizhou Normal University School of Big Data and Computer Science Guiyang550025 China Muroran Institute of Technology Department of Sciences and Informatics 0508585 Japan

Driven by the vision of integrated sensing and communication (ISAC) toward 6G technology, the WiFi-based respiration sensing approach has emerged as a highly competitive candidate for advanced healthcare services. Nevertheless, the indiscriminate perception of all the moving objects within the sensing area raises challenges for system stability and robustness for real-world deployment, especially for the susceptibility to motion interference from other people. Meanwhile, thanks to the emerging in-area wireless sensing technologies, i.e., beamforming, the dynamic environment tolerance of these technologies gives crucial opportunities for target-oriented WiFi-based healthcare services. This article discusses the compelling intersection of in-area WiFi sensing and the future of target-oriented intelligent respiratory healthcare network services. We first present a novel WiFi-based healthcare-assisting framework tailored for inter-user motion interference-tolerable (IMIT) sensing. The detailed components of low-level signal preprocessing, target-direction signal extraction, and healthcare-related services are discussed. By utilizing CSI beamforming technology, which adjusts a directional beam toward the desired direction and adaptively places beam nulls in noisy directions, we can mitigate motion interference and achieve target-oriented healthcare sensing. Finally, we discuss open challenges and potential solutions for target-oriented WiFi healthcare sensing. © 1986-2012 IEEE.

关键词： Wireless local area networks (WLAN)

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Measuring Near-Field Radiative Heat Transfer in a Graphene-SiC Heterostructure

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Physical Review Applied 2023年第2期19卷 024019-024019页

作者： Naeem Iqbal Sen Zhang Shuai Wang Zezheng Fang Yaoyuan Hu Yongdi Dang Minjie Zhang Yi Jin Jianbin Xu Binfeng Ju Yungui Ma State Key Lab of Modern Optical Instrumentation Centre for Optical and Electromagnetic Research College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou China The State Key Lab of Fluid Power Transmission and Control School of Mechanical Engineering Zhejiang University Hangzhou China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics Zhejiang University Hangzhou China Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road Hong Kong China

Near-field radiative heat transfer between closely placed objects may exceed the far-field black-body radiation limit by orders of magnitude, especially between polaritonic materials. Great efforts have been made to experimentally measure this fundamental effect in various systems. In this work, we manage to experimentally characterize the near-field thermal emission between less explored plasmon-phonon hybrid material systems made of a graphene-SiC heterostructure. The experiment is carried out using a custom-designed all-optical measurement setup. A heat flux enhancement factor of 26 over the black-body radiation limit is obtained at a 150-nm vacuum gap. Three fundamental modes, i.e., surface plasmon and phonon polaritons with frustrated modes, are identified to contribute the near-field heat flux in this hybrid system. The measured results are well reproduced from the analytical calculations, indicating the robustness of the measurement. Deeper experimental explorations for near-field heat transfer between more complicated material systems could be encouraged in the future.

关键词： Energy harvesting devices Heat transfer Near-field optics Surface plasmon polariton Graphene Van der Waals systems Optical techniques

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Network-constrained transactive control for multi-microgrids-based distribution networks with SOPs

arXiv

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arXiv 2020年

作者： Yang, Xiaodong Song, Zehao Wen, Jinyu Xu, Chongbo Wu, Qiuwei Zhang, Youbing Zhang, Menglin Cheng, Shijie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China College of Information Engineering Zhejiang University of Technology Hangzhou310023 China Center for Electric Power and Energy Department of Electrical Engineering Technical University of Denmark Kongens Lyngby2800 Denmark School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States Center for Electric Power and Energy Department of Electrical Engineering Technical University of Denmark Kongens Lyngby2800 Denmark

Different from most transactive control studies only focusing on economic aspect, this paper develops a novel network-constrained transactive control (NTC) framework that can address both economic and secure issues for a multi-microgrids-based distribution network considering uncertainties. In particular, we innovatively integrate a transactive energy market with the novel power-electronics device (i.e., soft open point) based AC power flow regulation technique to improve economic benefits for individual microgrids and meanwhile ensure the security of the entire distribution network. In this framework, a dynamic two-timescale NTC model consisting of slow-timescale pre-scheduling and real-time scheduling stages is formulated to work against multiple system uncertainties. Moreover, the original bilevel game problems are transformed into single-level mixed-integer second-order cone programming problems through KKT conditions, duality, linearization and relaxation techniques to avoid iterations of transitional methods, so as to improve computational efficiency. Finally, numerical simulations on a modified 33-bus test system with 3 MGs verify the effectiveness of the proposed framework. Copyright © 2020, The Authors. All rights reserved.

关键词： Power markets

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Highly Stable and Encapsulation-Microstructural Cathode Enabled by Na-Halides for Superb All-Solid-State Na Batteries

SSRN

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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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