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Directly wireless communication of human minds via non-invasive brain-computer-metasurface platform

eLight 2022年第1期2卷 132-142页

作者： Qian Ma Wei Gao Qiang Xiao Lingsong Ding Tianyi Gao Yajun Zhou Xinxin Gao Tao Yan Che Liu Ze Gu Xianghong Kong Qammer HAbbasi Lianlin Li Cheng‑Wei Qiu Yuanqing Li Tie Jun Cui Institute of Electromagnetic Space Southeast UniversityNanjing 210096China School of Automation Science and Engineering South China University of TechnologyGuangzhou 510641China State Key Laboratory of Millimeter Wave Southeast UniversityNanjing 210096China Center of Intelligent Metamaterials Pazhou Laboratory Guangzhou 510330China Research Center for Brain-Computer Interface Pazhou LabGuangzhou 510330China Department of Electrical and Computer Engineering National University of SingaporeSingaporeSingapore University of Glasgow James Watt School of EngineeringGlasgow G128QQUK State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsPeking UniversityBeijing 100871China

Brain-computer interfaces(BCIs),invasive or non-invasive,have projected unparalleled vision and promise for assisting patients in need to better their interaction with the *** by the BCI-based rehabilitation technologies for nerve-system impairments and amputation,we propose an electromagnetic brain-computer-metasurface(EBCM)paradigm,regulated by human’s cognition by brain signals directly and *** experimentally show that our EBCM platform can translate human’s mind from evoked potentials of P300-based electroencephalography to digital coding information in the electromagnetic domain non-invasively,which can be further processed and transported by an information metasurface in automated and wireless *** wireless communications of the human minds are performed between two EBCM operators with accurate text ***,several other proof-of-concept mind-control schemes are presented using the same EBCM platform,exhibiting flexibly-customized capabilities of information processing and synthesis like visual-beam scanning,wave modulations,and pattern encoding.

关键词： communication computer surface

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Resilient Market Bidding Strategy for Mobile Energy Storage System Considering Transfer Uncertainty

SSRN

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SSRN 2024年

作者： Wang, Kaijie Wei, Fanrong Lin, Xiangning Li, Zhengtian Ma, Yuncong Dawoud, Samir Mohammed State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan430074 China Xiangyang Power Supply Company State Grid Hubei Electric Power Company Hubei Xiangyang441000 China Department of Electrical Power and Machines Engineering Faculty of Engineering Tanta University Tanta31512 Egypt

The participation of Mobile Energy Storage Systems (MESS) in the electricity market can not only increase its own profit but also alleviate power transmission congestion and increase market clearing balance. However, relevant market trading strategies have yet to be explored. Accordingly, this paper proposes a resilient market bidding strategy for MESS considering the operation of transportation network. Firstly, this paper proposes a joint optimization framework of energy and transportation systems. In this framework, the upper layer is to make decisions on the space-time distribution and bidding strategy of MESS, and the lower layers is designed for the equilibrium of the transportation network and electricity market clearing. Subsequently, for the newly introduced transportation layer, this paper proposes a Logit-type Robust Stochastic User Equilibrium (LRSUE) to calculate the uncertain transfer time of MESS in the transportation network. Further, based on strong duality theory and Karush-Kuhn-Tucker Conditions (KKT) conditions, the two-layer model can achieve an efficient solution. Finally, IEEE14-bus system and a typical traffic network were provided to validate the proposed methods, demonstrating that MESS increase its revenue, alleviate power transmission congestion, and increase the electricity market clearing balance. © 2024, The Authors. All rights reserved.

关键词： Power markets

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Adaptive Anomaly Detection Disruption Prediction Starting from First Discharge on Tokamak

arXiv

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arXiv 2024年

作者： Ai, X.K. Zheng, W. Zhang, M. Ding, Y.H. Chen, D.L. Chen, Z.Y. Guo, B.H. Shen, C.S. Wang, N.C. Yang, Z.J. Chen, Z.P. Pan, Y. Shen, B. Xiao, B.J. 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 Institute of Plasma Physics Chinese Academy of Sciences Hefei230031 China

Plasma disruption presents a significant challenge in tokamak fusion, especially in large-size devices like ITER, where it can cause severe damage and economic losses. Current disruption predictors mainly rely on data-driven methods, requiring extensive discharge data for training. However, future tokamaks require disruption prediction from the first shot, posing challenges of data scarcity and difficulty in training and hyperparameter selection during the early operation period. In this period disruption prediction also aims to support safe exploration of operation range and accumulate necessary data to develop advanced prediction models. Thus, predictors must adapt to evolving plasma environments during this exploration phase. To address these challenges, this study proposes a cross-tokamak adaptive deployment method based on the Enhanced Convolutional Autoencoder Anomaly Detection (E-CAAD) predictor. This method enables disruption prediction from the first discharge of new devices, addressing the challenges of cross-tokamak deployment of data-driven disruption predictors. Experimental results demonstrate the ability of the E-CAAD model trained on existing devices to effectively differentiate between disruption precursors and non-disruption samples on new devices, proving the feasibility of model cross-device transfer. Building upon this, adaptive learning from scratch and threshold adaptive adjustment strategies are proposed to achieve model cross-device transfer. The adaptive learning from scratch strategy enables the predictor to fully use scarce data during the early operation of the new device while rapidly adapting to changes in the operation environment. The warning threshold adaptive adjustment strategy addresses the challenge of selecting warning thresholds on new devices where the validation set is lacking, ensuring that the warning thresholds adapt to changes in the operation environment. Finally, experiments transferring the model from J-TEXT to EAST e

关键词： Anomaly detection

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The engineering Practical Calculation Method of Circulating Current in YD-connected Transformer 2

The Engineering Practical Calculation Method of Circulating ...

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2nd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2021

作者： Cao, Wenbin Qi, Xuanwei Wang, Song Chen, Ming Yin, Xianggen Wen, Minghao State Grid Zhejiang Electrical Power Research Institute Hangzhou310014 China Huazhong University of Science and Technology Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9781665400640

The circulating current in the D-winding may cause primary current waveform distortion, and the reliability of the restraint criterion based on the typical magnetizing inrush current characteristics will be affected. The magnetizing inrush current with typical characteristics is the sum of primary current and circulating current. Using the circulating current to compensate the primary current can improve the reliability of the differential protection. When the phase is not saturated, the magnetizing inrush current is about zero. Therefore, the primary current of unsaturated phase can be replaced by the opposite of the circulating current. Based on this, an engineering practical calculation method for circulating current is proposed. In the method, the segmented primary currents are used to replace the circulating current. Phasor analysis is used to demonstrate the application effect of this method when remanence coefficients are different. The method is simple and practical, and has strong applicability and high reliability. Simulation and recorded waveforms have verified the effectiveness of the method. © 2021 IEEE.

关键词： Reliability

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Dominant Device Identification in Multi-Vsc Systems by Frequency-Domain Participation Factor

SSRN

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SSRN 2023年

作者： Zhan, Meng Yang, Ziqian Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key Laboratory School of Electrical and Electronic Engineering Hubei Wuhan430074 China Institute for New Power Systems Guangdong Guangzhou510000 China

With fast development of power electronic technology, the power system is undergoing a great revolution to a power-electronic-based one and it poses a great challenge to the dominant device identification for the system stability analysis. As an alternative approach, this paper proposes a frequency-domain participation factor method based on the open-loop transfer function matrix of power imbalance model. It also clarifies the relation between different (time-domain, frequency-domain closed-loop, and frequency-domain open-loop) participation factor analytical methods, showing that they are all certain sensitivities against parameter disturbance on different matrix elements. Furthermore, this method is well verified in the classical IEEE 10-generator-39-bus system where the synchronous generators are completely replaced by grid-following or grid-forming converters, and the system stability can be improved by modifying the corresponding parameters of the identified dominating converter. © 2023, The Authors. All rights reserved.

关键词： Power electronics

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Realization of divertor configuration discharge in J-TEXT tokamak

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Plasma Science and technology 2022年第12期24卷 102-113页

作者： Zhipeng CHEN Lizhi ZHU Xin XU Wei ZHENG Ming ZHANG Li GAO Minghui XIA Jie YANG Mingchong ZHU Zhigang HAO Shaodong JIAO Zhifeng CHENG Zhoujun YANG Xiaoqing ZHANG Zhongyong CHEN Nengchao WANG Yonghua DING Ge ZHUANG Kenneth W GENTLE 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 Department of Engineering and Applied Physics School of Physical Sciences University of Science and Technology of ChinaHefei 230026People's Republic of China Institute for Fusion StudiesUniversity of Texas Austin TX 78712United States of America Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich 52425Germany Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China

To extend the operation region of the Joint-Texas Experimental tokamak(J-TEXT) to the divertor configuration and even the H-mode,the divertor configuration discharge has been realized for the first time in the J-TEXT *** with the establishment of a power supply for the divertor configuration,the construction of relevant diagnostics,and the installation of the divertor target on the high-field side,divertor discharge has been *** the equilibrium calculation and position stability analysis,the control strategy has evolved to be more ***-density experiments and auxiliary heating experiments have been carried out on the divertor *** special midplane single-null(MSN) divertor configuration is shown to be more stable than the limiter configuration in the density limit condition and can reach a higher density in the *** the ECRH experiment,the power injection enhances the electron temperature and density,while more heat outflux is loaded on the divertor target tiles and causes more intensive recycling and impurity *** future plan for the divertor configuration operation in the J-TEXT tokamak is also included.

关键词： tokamak high-field side midplane single null divertor

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SIMULATION AND DESIGN OF NEW DCCB TEST CIRCUIT 22

SIMULATION AND DESIGN OF NEW DCCB TEST CIRCUIT

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22nd International Symposium on High Voltage engineering, ISH 2021

作者： Li, Guixia Yuan, Zhao Chen, Lixue Deng, Chun Cai, Wei Qin, Yifan Key Laboratory of Pulsed Power Technology Huazhong University of Science and Technology Ministry of Education Hubei Province Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical andElectronic Engineering Huazhong University of Science and Technology Hubei Province Wuhan430074 China

ISBN: (纸本)9781839536052

It is necessary to ensure the equivalence of the recovery voltage and its rising rate during the breaking test of mechanical HVDC circuit breaker. In this paper, a test circuit topology is proposed, which is composed of current source, commutation source and recovery voltage source. Both current source and commutation source are oscillation circuits composed of L and C, which use low-voltage capacitor to provide fault current and current zero-crossing point for DCCB. Recovery voltage source uses high-voltage capacitor, which mainly provides recovery voltage for DCCB. The design of the test circuit realizes the isolation of the recovery voltage source from the current source and the commutation source, ensuring that the recovery voltage can rise rapidly after the successful breaking of DCCB. The advantage of this topology is that the test circuit ensures the equivalence of di/dt and du/dt in the breaking test, and the consumption of capacitance is smaller and the cost is low. Finally, the effectiveness of the test circuit is verified by simulation software, Whe simulation results show that the test circuit can not only fully simulate the recovery voltage and its rising rate, but also ensure the equivalence of current process. © 2021 The Institution of engineering and technology.

关键词： Capacitance

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Strong coupling of an EIT-like metamaterial with photons in a photonic crystal cavity

Strong coupling of an EIT-like metamaterial with photons in ...

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International Conference on Infrared and Millimeter Waves

作者： Fanqi Meng Lei Cao Aristeidis Karalis Hantian Gu Mark D. Thomson Hartmut G. Roskos Goethe-Universität Frankfurt Physikalisches Institut Frankfurt am Main Germany State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge USA

We report strong coupling between a plasmonic dark mode of an EIT-like metamaterial (EIT: electromagnetically induced transparency) with the photons of a 1D photonic crystal cavity in the terahertz frequency range. The coupling between the dark mode and the cavity photons is mediated by a plasmonic bright mode, which is proven by the observation of a frequency splitting which depends on the strength of the inductive interaction between the plasmon bright and dark modes of the EIT metamaterial. In addition, since the plasmonic dark mode strongly couples with the cavity dark mode, we observed four polariton modes. The frequency splitting by interaction of the four modes (plasmonic bright and dark mode and the two eigenmodes of the photonic cavity) can be reproduced in the framework of a model of four coupled harmonic oscillators.

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Repetitive Control-Based Torque Ripple Reduction Method for SRM Drive 5

Repetitive Control-Based Torque Ripple Reduction Method for ...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Wu, Yiying Wang, Shuanghong Li, Longchun He, Miao Zhong, Cheng Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Shaanxi Aero Electric Co. Ltd Xian China Guizhou Aerospace Linquan Motor Co. Ltd Guizhou China Aerospace Heavy Industry Co. Ltd Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

In this paper, a torque ripple suppression strategy of SRM based on repetitive control was proposed. Due to the doubly salient structure of SRM, the rate of rising current and falling current is different in the current commutation period, which leads to a large fluctuation of electromagnetic torque. In the conventional current chopping control, the current would exceed the hysteresis range in practical application due to the insufficient switching frequency. Therefore, a repetitive controller has been used in the speed loop to generate a periodic current reference signal, which can improve the reference current in advance. And the improved soft current chopper control combined with PWM is adopted in current loop to reduce the torque ripple caused by current overshoot in the single-phase excitation stage. In this paper, an SRM control system based on repetitive control has been constructed. The proposed control strategy is verified by simulation, and the FFT analysis is used to illustrate the effect of the strategy on the suppression of torque ripple, which proves that the proposed control method can effectively reduce the torque ripple. © 2022 IEEE.

关键词： Torque

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Energy Joint Scheduling of Isolated Islands Considering Low-Density Production Period of Renewable Energy

SSRN

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SSRN 2024年

作者： Sun, Chengcheng Bai, Chunhan Wei, Fanrong Lin, Xiangning Khalid, Muhammad S. Dawoud, Samir M. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Province Wuhan430074 China Department of Electrical Engineering National University of Computer and Emerging Sciences Faisalabad Pakistan Department of Electrical Power and Machines Engineering Faculty of Engineering Tanta University Tanta Egypt

In view of the special dispatching demand of isolated islands in the low-density period of renewable energy power generation, the defects of traditional dispatching mode applying in isolated power generation system is analyzed, and the idea of reasonably extending the daily scheduling cycle is proposed to adapt to the application of flexible energy resources in the form of energy package under various uncertain scenarios. Under the multi-party cooperative power supply strategy of isolated islands, we analyze the shortcomings of key element modeling. The global optimal model of energy scheduling of isolated islands considering low-density energy output period is constructed based on refined element model, and the corresponding solution method is proposed for the nonlinear constraints. The reasonability and effectiveness of the refined model, global optimal model and the assumption of extended scheduling cycle are verified by theoretical analysis and case simulation. © 2024, The Authors. All rights reserved.

关键词： Energy resources

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