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2020 International Conference on Ubiquitous Power Internet of Things, UPIOT 2020 and 4th International Symposium on Green Energy and Smart Grid, SGESG 2020

作者： Tang, Xiaoliang Yang, Fang Zhou, Yabing Zhang, Guangyi Gong, Jie Qingyuan Power Supply Bureau China Southern Power Grid Corporation Qingyuan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Flexible Multi-states Switch based on power electronics technology can realize the flexible interconnection between feeders, elastically control feeder power flow and solve the serious unbalance of feeder power flow in the distribution network. To solve the problem, this paper proposes that using flux-controlled variable reactor as the topology of flexible multi-states switch in distribution network. Firstly, flux-controlled variable reactor's principle will be introduced;Then, we analyze the principle of feeder power flow's control using variable reactor;After that, the control strategy for the flexible multi-states switch with different access methods is proposed;At last, a MATLAB simulation model and the prototype experiment platform are built. The results verified the power flow control function of flexible multi-states switch and effectiveness of proposed controlled strategy. © Published under licence by IOP Publishing Ltd.

关键词： MATLAB

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Optimal Energy Management for Residential House Aggregators with Uncertain User Behaviors Using Deep Reinforcement Learning

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IEEE Transactions on Industry Applications 2025年

作者： Lin, Yujun Yan, Linfang Hui, Hongxun Yang, Qiufan Zhou, Jianyu Chen, Yin Chen, Xia Wen, Jinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan 430074 China State Grid (Suzhou) City & Energy Research Institute Jiangsu Suzhou China University of Macau State Key Laboratory of Internet of Things for Smart City Department of Electrical and Computer Engineering 999078 Macao Central China Branch of State Grid Corporation of China Wuhan China Sichuan University College of Electrical Engineering Chengdu China University of Strathclyde Department of Electronic and Electrical Engineering Glasgow G1 1XW United Kingdom

This paper addresses the home energy management (HEM) problem for a large number of residential houses, which can be regarded as a high-dimensional optimization problem. To cope with the high-dimensional issue, the concept of the aggregator is utilized to reduce the state and action space. And a two-stage deep reinforcement learning (DRL) based approach is proposed for the aggregators to track the schedule from the superior grid and guarantee the operation constraints. In the first stage, a DRL control agent is set to learn the optimal scheduling strategy interacting with the environment based on the soft-actor-critic (SAC) framework and generate the aggregate control actions. In the second stage, the aggregate control actions are disaggregated to individual appliances considering the users' behaviors. The uncertainty of the EV charging demand is quantitatively described by the driver's experience. An aggregate anxiety concept is introduced to characterize both the driver's anxiety on the EV's range and uncertain events. Finally, simulation studies verify the effectiveness of the proposed approach under dynamic user behaviors, and the comparisons also show the superiority of the proposed approach over the method mentioned in benchmarks. © 1972-2012 IEEE.

关键词： deep reinforcement learning dynamic user behaviors electric vehicles (EVs) Home energy management soft actor-critic

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Design and Analysis of Segmented Dipole Coil for Scalable Wireless Power Transfer to Multiple Devices

Design and Analysis of Segmented Dipole Coil for Scalable Wi...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Xiangrui He Cancan Rong Conghui Lu Yingqin Zeng Xiaobo Liu Renzhe Liu Minghai Liu 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 Power Engineering China University of Mining and Technology Xuzhou China

ISBN: (纸本)9781665400657

This paper proposed a novel dipole coil using segmented windings for wireless power transfer (WPT) system with four receivers. The most attractive feature is that the couplings between transmitter and the receivers can be enhanced under the premise of lower core saturation with segmented dipole coil (SDC). Mistuning issues caused by the utilization of ferrite core are modeled and analyzed in detail. Furthermore, an optimized SDC is proposed to homogenize the magnetic field density in ferrite core. Thus, the proposed structure shares the same core saturation with dipole coil using evenly distributed windings but possesses a 30.7% more coupling strength. Eventually, an experimental prototype compensated by LCC-S topology is established. The maximum overall efficiency of four loads reaches 48% when the distance-to-diameter ratio equals to 1. The proposal of novel SDC structure can provide a significant guideline for numerous charging scenarios, such as multiple sensors or robot swarms.

关键词： Ferrites Couplings Transmitters Magnetic cores Simulation Windings Prototypes

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Terahertz-Polarizing Effect Based on Geometric Anisotropy of Ti3C2Tx Mxene Nanosheets

SSRN

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SSRN 2024年

作者： Lee, Changjae Oh, Eon-Taek Park, Tae Gwan Lee, Seongeun Kim, Seon Joon Choi, Yun-Seok Rotermund, Fabian Yoon, Dong Ki Department of Chemistry Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Department of Physics Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Department of Materials Science and Engineering Korea University Seoul02841 Korea Republic of Materials Architecturing Research Center Korea Institute of Science and Technology Seoul02792 Korea Republic of Division of Nanoscience and Technology KIST School University of Science and Technology Seoul02792 Korea Republic of Convergence Research Center for Solutions to Electromagnetic Interference in Future-mobility Korea Institute of Science and Technology Seoul02792 Korea Republic of Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM87545 United States Oak Ridge National Laboratory United States

Two-dimensional (2D) nanomaterials have garnered considerable attention due to their unique properties, such as thinness and excellent electronic properties. The inherent anisotropy of 2D nanomaterials, which is characterized by their high aspect ratio, can maximize the directional functionality to enhance the conductivity and utilization of edges. Here, we demonstrate how to utilize the edges of titanium carbide (Ti3C2Tx) MXene nanosheet to control the linear polarization in the terahertz (THz) frequency range. By a simple and unique vertical alignment exploiting the high surface charge and excellent colloidal dispersibility of MXene nanosheets, MXene nanosheets are vertically oriented along an applied AC electric field. The well-aligned edges justify the THz polarizing effect, revealing outstanding performances such as the broadband coverage in 0.2 – 1.5 THz and an exceptional extinction ratio reaching 20 dB. Furthermore, we vary the local orientation of the vertical MXene nanosheets by tailoring the applied electric field, enabling spatially controllable polarization capabilities. Our results can provide a generic tool for the utilization of 2D nanomaterials in diverse potential applications in optics and electronics. © 2024, The Authors. All rights reserved.

关键词： Nanosheets

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Transferable Cross-Tokamak Disruption Prediction with Deep Hybrid Neural Network Feature Extractor

arXiv

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arXiv 2022年

作者： Zheng, Wei Xue, Fengming Zhang, Ming Chen, Zhongyong Shen, Chengshuo Ai, Xinkun Wang, Nengchao Chen, Dalong Guo, Bihao Ding, Yonghua Chen, Zhipeng Yang, Zhoujun Shen, Biao Xiao, Bingjia Pan, Yuan 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 Institute of Plasma Physics HFIPS Chinese Academy of Sciences Hefei230031 China College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China

Predicting disruptions across different tokamaks is a great obstacle to overcome. Future tokamaks can hardly tolerate disruptions at high performance discharge. Few disruption discharges at high performance can hardly compose an abundant training set, which makes it difficult for current data-driven methods to obtain an acceptable result. A machine learning method capable of transferring a disruption prediction model trained on one tokamak to another is required to solve the problem. The key is a disruption prediction model containing a feature extractor that is able to extract common disruption precursor traces in tokamak diagnostic data, and a transferable disruption classifier. Based on the concerns above, the paper first presents a deep fusion feature extractor designed specifically for extracting disruption precursor features from common diagnostics on tokamaks according to currently known precursors of disruption, providing a promising foundation for transferable models. The fusion feature extractor is proved by comparing with manual feature extraction on J-TEXT. Based on the feature extractor trained on J-TEXT, the disruption prediction model was transferred to EAST data with mere 20 discharges from EAST experiment. The performance is comparable with a model trained with 1896 discharges from EAST. From the comparison among other model training scenarios, transfer learning showed its potential in predicting disruptions across different tokamaks. Copyright © 2022, The Authors. All rights reserved.

关键词： Forecasting

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Phase–amplitude model for doubly fed induction generators

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Journal of Modern Power Systems and Clean Energy 2019年第2期7卷 369-379页

作者： Hua HUANG Ping JU Xueping PAN Yuqing JIN Xiaoming YUAN Yuan GAO State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China

The doubly fed induction generator(DFIG) is major type of wind turbine generator used in grid-connected wind farms. Practical models of DFIG have been built to study the influence of wind power generation on power system dynamics. However, most existing practical models of the DFIG are based on rectangular coordinates,in which frequency variation is neglected. In this paper, a phase-amplitude(P-A) model is proposed for a DFIG based on phase and amplitude of the internal voltage. The model structure is much like that of the synchronous generator, and the rotor voltage can manipulate both the amplitude and the phase of the internal *** have been made between the new P-A model of the DFIG and the synchronous generator model,as well as the asynchronous motor *** contributions of the new P-A model of the DFIG are discussed and it is demonstrated that the proposed model has better ability in describing power system dynamic phenomena such as voltage dynamics and structural dynamics. Simulation results and a field test validate these contributions.

关键词： Doubly fed induction generator(DFIG) Model Internal voltage Voltage dynamics Frequency dynamics

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Scheme and strategy design for wireless charging of wireless sensor network in substation 1

Scheme and strategy design for wireless charging of wireless...

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Wu, Jinling Liu, Kai Tian, Jie Li, Yan Zhang, Weixin Li, Ang Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Shenzhen Power Supply Co. Ltd Shenzhen518001 China

ISBN: (纸本)9781728196596

Aiming at the need of online intelligent perception in substations, this paper designs and researches wireless sensor networks in substations. Apply the magnetic resonance wireless energy transmission technology, select the LCL-S circuit topology according to the circuit characteristics, design its charging scheme for wireless sensor nodes, and explain its applicability and advantages. Then, according to the characteristics of the substation, a wireless sensor network deployment scheme for the substation is proposed. Aiming at this scheme, the ant colony algorithm is used to design the wireless charging strategy of sensor nodes. The results show that the charge planning strategy based on the ant colony algorithm can ensure the overall and continuous operation of the substation wireless sensor network, and effectively reduce the energy consumption cost of the entire wireless sensor network. © 2020 IEEE.

关键词： Magnetic resonance

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An New Method for Detecting Harmonic Currents

An New Method for Detecting Harmonic Currents

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2020 International Conference on Ubiquitous Power Internet of Things, UPIOT 2020 and 4th International Symposium on Green Energy and Smart Grid, SGESG 2020

作者： Chen, Xianfeng Guo, Lin Gong, Jie Huizhou Power Supply Bureau Guangdong Power Grid Corporation Huizhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The widespread use of power electronics has led to increasing problems with harmonics in power systems. The ip-iq detection method is a common method to detect harmonics. If there is a symmetry of the three phases of the power system, the ip-iq detection method can have very large errors in detecting the harmonic current. To solve this problem, an new method for detecting harmonic currents is proposed in this paper. The method solves the phase between the positive sequence voltage of each phase and the actual voltage by using the delay method to obtain the positive sequence fundamental signal of the fundamental current error problem. The simulation was then carried out using MATLAB/SIMULINK, and the simulation results confirmed the method still accurately detects harmonic currents in all cases. Therefore, this method is of great research importance for the elimination of harmonics. © Published under licence by IOP Publishing Ltd.

关键词： Harmonic analysis

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Sinusoidal waveform modulated voltage supply for current improvement of water electrolyzers based on multi-physical dynamics

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Applied Energy 2025年 397卷

作者： Kewei Hu Jiakun Fang Xiaomeng Ai Zhiyao Zhong Xiaobo Yang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China Hitachi ABB Power Grids Research Beijing China

In this paper, the effect of the sinusoidal waveform modulated voltage (SWMV) on the performance of the water electrolyzers is investigated based on multi-physical dynamics. By introducing the dynamic bubble in the industrial water electrolyzers, Sinusoidal waveform modulated voltage supply can theoretically improve the overall current density by taking advantage of the time-scale differences between the electrochemical reaction and the diphasic flow. In order to prove the analysis, a three-dimensional dynamic multiphysics model of the alkaline electrolyzer is established by considering the bidirectional coupling of the diphasic flow field and the current density field, which are then validated by the experiment on the RTLab-based electrolysis testbed. Results show that the overall hydrogen production rate can be improved by 1.82 % to 3.07 % under sinusoidal waveform modulated voltage with the frequency ranging from 0.01 Hz to 9 Hz, which is primarily attributed to the transient process of the diphasic flow in seconds. Furthermore, the time constant of the flow field has proved to be a critical parameter determining the current gain brought by sinusoidal waveform modulated voltage, where up to 4.5 % promotion of the current density is realized by extending the flow channel. The discovery is expected to pave the way for renewable power-to‑hydrogen by bridging the gap between fluctuating renewable energy and water electrolyzers.

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Efficiency and bandwidth improvement of integrated acousto-optic modulators using dielectric acoustic reflectors

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APL Photonics 2025年第5期10卷

作者： Liu, Huilong Huang, Jiying Jiang, Jiantao Huang, Hongyi Chen, Huipeng Chen, Chengyu La, Haiwei Li, Huan Xu, Xiaochun Chen, Yuping Li, Zhaohui Wan, Lei School of Physics Ningxia University Yinchuan750021 China Department of Electronic Engineering College of Information Science and Technology Jinan University Guangzhou510632 China State Key Laboratory of Photonics and Communications School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Extreme Photonics and Instrumentation Center for Optical and Electromagnetic Research College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou310058 China North Minzu University Yinchuan750030 China Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems Sun Yat-sen University Guangzhou510275 China Zhuhai519000 China

Manipulation and control of traveling surface acoustic waves (SAWs) are critical to the realization of high-performance integrated acousto-optic modulators (AOMs). In this paper, we present the chalcogenide glass (ChG) acoustic reflector-loaded thin-film lithium niobate (TFLN) Mach-Zehnder interferometer (MZI) AOMs with single-arm and single-finger configurations based on the forming mechanism of the acoustic standing wave. Through the engineering of dielectric acoustic reflectors, threefold modulation efficiency improvement is achieved for the TFLN MZI AOM with X-Z orientation, while twofold bandwidth extension is demonstrated for the counterpart with X-30°Y orientation. Propagation loss of the Rayleigh SAW around 0.85 GHz and the reflection coefficient of ChG acoustic grating are measured to be 3.04 dB/mm and 0.34, respectively. Introduction of dielectric acoustic reflectors opens a new pathway to the study of efficient and wideband acousto-optic interaction devices. © 2025 Author(s).

关键词： Light modulation

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