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Sustainable Power and Energy Conference (iSPEC)

作者： Jianhua Pei Zhipeng Wu Jingyu Wang Dongyuan Shi State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665414401

The development of cyber-physical power systems gives rise to the concerns on the data quality issue of phasor measurement units (PMUs). Low signal-to-noise ratios (SNRs) and data missing caused by malicious electromagnetic interference, false data injections, and equipment malfunctioning may jeopardize the integrity and availability of power system monitoring, protection, and control applications. To ensure grid resiliency, this paper proposes a PMU measurement recovery method based on the singular spectrum analysis of Hankel structures. It utilizes single or multiple channels of PMU time-series to restore the problematic phasor measurements with low SNRs and data losses. Numerical case studies demonstrate that the proposed method can recover the noise-contaminated measurements with higher accuracy than traditional methods such as filtering and wavelet analysis, and can effectively complete the missed data. The latency margins of power system applications can be satisfied in the mean time.

关键词： electromagnetic interference Wavelet analysis Phasor measurement units Loss measurement Real-time systems Power systems Spectral analysis

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NIR-Ⅱ Excitation and NIR-I Emission Based Two-photon Fluorescence Lifetime Microscopic Imaging Using Aggregation-induced Emission Dots

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Chemical Research in Chinese Universities 2021年第1期37卷 171-176页

作者： LIU Wen ZHANG Yuhuang QI Jj QIAN Jun TANG Ben Zhong State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou310058P.R.China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of TechnologyGuangzhou510640P.R.China Department of Chemistry The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionInstitute for Advanced Study and Department of Chemical and Biological Engineering and Institute of Molecular Functional MaterialsThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP.R.China

Near-infrared(NIR)lights are powerful tools to conduct deep-tissue imaging since NIR-Ⅰ wavelengths hold less photon absorption and NIR-Ⅱ wavelengths serve low photon scattering in the biological tissues compared with visible ***-photon fluorescence lifetime microscopy(2PFLM)can utilize NIR-Ⅱ excitation and NIR-Ⅰ emission at the same time with the assistance of a well-designed fluorescent *** induced emission(AIE)dyes are famous for unique optical properties and could serve a large two-photon absorption(2PA)cross-section as aggregated ***,we report two-photon fluorescence lifetime microscopic imaging with NIR-Ⅱ excitation and NIR-Ⅰ emission using a novel deep-red AIE *** AIE-gens held a 2PA cross-section as large as 1.61×10^(4)GM at 1040 *** AIE dots had a two-photon fluorescence peak at 790 nm and a stable lifetime of 2.2 ns under the excitation of 1040 nm femtosecond *** brain vessels of a living mouse were vividly reconstructed with the two-photon fluorescence lifetime information obtained by our home-made 2PFLM *** vessels as small as 3.17µm were still observed with a nice signal-background ratio at the depth of 750µ*** work will inspire more insight into the improvement of the working wavelength of fluorescent agents and traditional 2PFLM.

关键词： Near-infrared Brain imaging Aggregation-induced emission Two-photon fluorescence lifetime microscopic imaging

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Mechanism Analysis of Impact of Wind Power Generation on Synchronous Generator Damping

Mechanism Analysis of Impact of Wind Power Generation on Syn...

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Sustainable Power and Energy Conference (iSPEC)

作者： Wei He Xiaojie Zhang Yunpeng Zhou State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665414401

This paper presents an insight view on how doubly fed induction generator (DFIG) type wind power source influences the small signal stability of power system. Firstly, DFIG wind turbine is modeled as a controllable voltage source and its internal voltage is defined. Secondly, a standard source which is considered to supply no damping effect is proposed. Thirdly, the impacts of DFIG in some common control modes on synchronous generator (SG) damping are analyzed respectively based on an extended Hefferon–Phillips model by comparing DFIG and the standard source. From the extended Hefferon– Phillips model, how the internal voltage of DFIG responds and influences the variation of rotor speed of synchronous generator is analyzed and some useful conclusions are obtained. To validate the analysis, a detailed electromagnetic transient time domain simulation is carried out.

关键词： Damping Analytical models Doubly fed induction generators Rotors Wind power generation Power system stability Synchronous generators

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Performance limits of high voltage press-pack SiC IGBT and SiC MOSFET devices

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Power Electronic Devices and Components 2022年 3卷

作者： Han, Lubin Liang, Lin Wang, Yijian Tang, Xinling Bai, Song State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Beijing Intelligent Energy Research Institute Beijing102209 China State Key Laboratory of Wide-Bandgap Semiconductor Power Electronic Devices the 55th Research Institute of China Electronics Technology Group Corporation Nanjing210016 China

Considering the switching frequency limit and electromagnetic interference, the selection of high voltage SiC IGBT and SiC MOSFET is confusing due to punch-through effect and bipolar characteristics of SiC IGBT. The thermal resistance, static characteristics and dynamic characteristics of SiC IGBT and SiC MOSFET module with Press-Pack packaging are measured to evaluate the switching frequency limit and electromagnetic interfere of them. The tradeoffs of SiC IGBT between switching frequency limit and electromagnetic interfere are less attractive due to the intrinsic characteristics, such as high power loss and punch-through effect. The possible solutions for SiC IGBT are proposed based on the improvement of driving resistor and driving voltage. © 2022 The Authors

关键词： Silicon carbide

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Concept Design of BU for Mesh-like Constant Current Seafloor Observation Networks

Concept Design of BU for Mesh-like Constant Current Seafloor...

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

作者： Peng Fan Ying Xu Li Ren Yuejin Tang Jing Shi Jingdong Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665400657

Cabled undersea observation networks have been attracting increasing research attention due to the abilities of abundant power distribution and broad bandwidth communication. Stability of their power supply systems is crucial for their normal operation. However, rare studies were carried out on constant current (CC) mesh-like undersea observation networks. This paper focuses on designing branching unit (BU) for CC mesh-like seafloor observation network. Firstly, the design concept of CC mesh-like submarine power system is introduced, as well as the equivalent model of power delivery submarine cable and the circuit of CC converters. Then, based on features of the power network, concept of BU for mesh-like CC system is proposed respectively, and reliability protection schemes for various scenarios are analyzed. The model of the observatory network was set in MATLAB, Simulations were carried out, from which results showed good consistence, verifying the theoretical methods.

关键词： Power supplies Sea floor Surge protection Reliability theory Power system stability Mathematical models Topology

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Validation of the plasma-wall self-organization model for density limit in ECRH-assisted start-up of Ohmic discharges on J-TEXT

arXiv

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arXiv 2023年

作者： Liu, Jiaxing Zhu, Ping Escande, Dominique Franck Zhang, Junli Xia, Donghui Wang, Yuhan Wang, Jiaming Yang, Qinghu Fang, Jiangang Gao, Li Cheng, Zhifeng Chen, Zhipeng Yang, Zhoujun Chen, Zhongyong Ding, Yonghua 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 Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Aix-Marseille Université CNRS PIIM UMR 7345 Marseille France

A recently developed plasma-wall self-organization (PWSO) model predicts a significantly enhanced density limit, which may be attainable in tokamaks with ECRH-assisted ohmic startup and sufficiently high initial neutral density. Experiments have been conducted on J-TEXT to validate such a density limit scenario based on this model. Experimental results demonstrate that increasing the pre-filled gas pressure or ECRH power during the startup phase can effectively enhance plasma purity and raise the density limit at the flat-top. Despite the dominant carbon fraction in the wall material, some discharges approach the edge of the density-free regime of the 1D model of PWSO. Copyright © 2023, The Authors. All rights reserved.

关键词： Electric discharges

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Healing of the edge magnetic island in the island divertor configuration on J-TEXT

arXiv

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arXiv 2025年

作者： Hou, Zhangrong Zhou, Song Wang, Nengchao Ding, Yonghua Jiang, Zhonghe Liang, Yunfeng Ren, Zhengkang Mao, Feiyue Yang, Qinghu Wang, Jiaming Xu, Xin Yang, Yutong Hua, Jiankun Xuan, Zijian Zhao, Chuanxu Li, Yangbo Yu, Lei Xia, Donghui Chen, Zhipeng Yang, Zhoujun 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 Forschungszentrum Jülich GmbH Institut für Energie- und Klimaforschung—Plasmaphysik Jülich52425 Germany Institute of Plasma Physics Chinese Academy of Sciences Hefei230031 China

The phenomena of island healing and configuration transition induced by high-power electron cyclotron resonance heating (ECRH) have been investigated in the island divertor configuration on the J-TEXT tokamak. Experimental results reveal that the size of the edge open magnetic island with mode number m/n = 3/1 decreases substantially under specific ECRH conditions. This process, referred to as island healing, occurs when ECRH with a power of 500~600 kW is deposited in the plasma core or when 250 kW of ECRH is deposited at r"# = 0.5 a, where a is the minor radius. The reduction of the island width makes the island divertor ineffective and transition into the limiter configuration. A model incorporating the influence of ECRH on the scrape-off layer (SOL) thermoelectric current is proposed to explain the observed changes in the edge magnetic topology of the island divertor configuration. These findings suggest that ECRH should be deposited at the plasma core with carefully controlled power to ensure the stable and compatible operation of ECRH and the island divertor configuration in tokamaks. The results can provide insights into achieving robust operation of an island divertor in tokamaks. Copyright © 2025, The Authors. All rights reserved.

关键词： Tokamak devices

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Optimal Capacity Planning of a Bundled Wind-Photovoltaic-Thermal Generation System Considering Carbon Emission Trading 14

Optimal Capacity Planning of a Bundled Wind-Photovoltaic-The...

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14th International Conference on Computer and Electrical engineering, ICCEE 2021

作者： Ouyang, Litao Fan, Yue Lou, Suhua Zhang, Yuanxin Bai, Chongtao Yu, Haiyang China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan430074 China State Grid Qinghai Electric Power Corporation Xining Qinghai810008 China

In view of the situation of the bundled wind-photovoltaic-thermal generation system (BWPTGS) in China's new energy bases and the demand of carbon emissions reduction in generation system, this paper constructs a capacity planning method for wind-photovoltaic-thermal bundling power supply considering the life cycle carbon emissions. Based on the concept of low-carbon economy, this paper introduces carbon emission trading (CET) method into capacity planning of BWPTGS. Then, this paper calculates the carbon emissions cost of the generation system under the carbon emissions trading mechanism. With the objective of minimizing the comprehensive cost of generation system taking into account the cost of CET, the paper constructs an optimal generation system planning model for new energy bases considering carbon emission trading. The optimization model is applied to a BWPTGS for a new energy base in north-western China. Case studies are conducted to demonstrate the effectiveness of this proposed model and method. © Published under licence by IOP Publishing Ltd.

关键词： Emission control

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A weighted matching scheme of magnetic coil design for FRC shaping control

arXiv

引用

arXiv 2023年

作者： Qu, Zitong Zhu, Ping Chen, Zhipeng Li, Haolong Liu, Jiaxing 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 Department of Nuclear Engineering and Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China

The two-dimentional (2D) separatrix shaping plays a crucial role in the confinement of the Field-Reversed Configuration (FRC), and the magnetic coils serve as an effective means for its control. In this work we develop a method to optimize the location, and current amplitude of the coils required for achieving the target separatrix shape. By iteratively calculating the coil currents, the plasma current, and the equilibrium magnetic flux, the equilibrium separatrix progressively converges towards the desired shape. The coil currents are determined through a matching method, and the NIMEQ code is employed to compute the FRC equilibrium with a Rigid Rotor type of plasma distribution. This approach enables the adaption of the equilibrium separatrix into any desired shape, thus offering a potential coil optimization scheme for the device design and the 2D shaping control of FRC plasma. Copyright © 2023, The Authors. All rights reserved.

关键词： Iterative methods

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Numerical simulation of disruption mitigation by applying non-resonant magnetic perturbation and massive gas injection on J-TEXT

Numerical simulation of disruption mitigation by applying no...

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

作者： Zhen Li Zhonghe Jiang Fan Gu Zixiao Jiao Jianjun Yuan Keze Li Jinyu Xiong 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 Wuhan China Institute of Fusion and Plasma Physics School of Electrical and Electronic Engineering

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477338

A lot of experimental and theoretical researches have been carrying out to examine the disruption mechanism and the methods to mitigate disruption, including massive gas injection (MGI) and shattered pellet injection (SPI). Based on NIMROD (non-Ideal Magnetohydrodynamics with Rotation, Open Discussion), numerical simulations of the synergistic effect between non-resonant magnetic perturbations and massive gas injection on disruption mitigation is carrying out in J-TEXT. In this paper, we investigate thermal quench, current quench time and the growth of $\mathrm{n}=1-3$ component MHD instabilities responsed to different amplitudes of non-RMPs. The results indicates that non-RMPs can prolong thermal quench and current quench durations and create stronger perturbations during disruption, leading to a high loss of runaway electrons seeds and reducing the hazard of disruption.

关键词： Electrical engineering Magnetohydrodynamics Perturbation methods Thermal quenching Impurities Numerical simulation Hazards

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