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Robustness Assessment of Wind Power Generation Considering Rigorous Security Constraints for Power System: A Hybrid RLO-IGDT Approach

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 518-529页

作者： Lianyong Zuo Shengshi Wang Yong Sun Shichang Cui Jiakun Fang Xiaomeng Ai Baoju Li Chengliang Hao Jinyu Wen State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430073China State Grid Jilin Electric Power Company Changchun 130021China

Fossil fuel depletion and environmental pollution problems promote development of renewable energy(RE)*** increasing penetration of RE,operation security and economy of power systems(PS)are greatly impacted by fluctuation and intermittence of renewable *** this paper,information gap decision theory(IGDT)is adapted to handle uncertainty of wind power *** on conventional IGDT method,linear regulation strategy(LRS)and robust linear optimization(RLO)method are integrated to reformulate the model for rigorously considering security *** a robustness assessment method based on hybrid RLO-IGDT approach is proposed for analyzing robustness and economic performance of ***,a risk-averse linearization method is adapted to convert the proposed assessment model into a mixed integer linear programming(MILP)problem for convenient optimization without robustness ***,results of case studies validate superiority of proposed method in guaranteeing operation security rigorously and effectiveness in assessment of RSR for PS without *** Terms-Hybrid RLO-IGDT approach,information gap decision theory(IGDT),operation security,robustness assessment,robustness security region(RSR).

关键词： IGDT approach information gap decision theory(IGDT) operation security robustness assessment robustness security region(RSR)

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Stress-induced self-assembly of hierarchically twisted stripe arrays

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Science Bulletin 2025年第5期70卷 704-711页

作者： Zhenghao Zhang Zekai Zhang Junyu Hou Yiyue Zhao Jia Jia Jiwei Wang Jie Zhao Cheng Lian Angang Dong Dongyuan Zhao Wei Li Department of Chemistry Laboratory of Advance MaterialsShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsState Key Laboratory of Molecular Engineering of Polymersand iChEMFudan UniversityShanghai 200433China School of Chemistry and Molecular Engineering East China University of Science and TechnologyShanghai 200237China

Hierarchical organization is prevalent in nature,yet the artificial construction of hierarchical materials featuring asymmetric structures remains a big ***,we report a stress-induced self-assembly strategy for the synthesis of hierarchically twisted stripe arrays(HTSAs)with mesoporous structures.A soft and thin mesostructured film assembled by micelles and TiO_(2) oligomers is the ***,the external stress coming from the exfoliation process triggers the deformation of this mesostructured film into hierarchically twisted *** stripe width and twist degree can be well manipulated by adjusting the cross-linking degree and thickness of the mesostructured ***,this strategy is facile and versatile to synthesize HTSAs with diverse components,including carbon,Al2O3 and *** find that mesoporous TiO_(2) HTSAs can serve as an ideal integrator for adsorption-enrichment-detection process,exhibiting a rapid and high adsorption capacity towards molecules at low concentrations and enabling the subsequent surface-enhanced Raman scattering(SERS)*** twisted stripe arrays achieve 2.3-fold and 5.6-fold enhancements in SERS compared with flat surfaces and solution conditions,respectively,due to the increased Raman scattering among the hierarchical,twisted,and mesoporous structures.

关键词： Mesoporous materials Hierarchical structures Self-assembly Surface-enhanced Raman scattering

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Analysis of an Axial-flux Slotted Limited-angle Torque Motor with Quasi-Halbach Array for Torque Performance Improvement

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CES Transactions on Electrical Machines and Systems 2023年第3期7卷 266-274页

作者： Mingjie Wang Dawei Li Ronghai Qu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China IEEE

Better torque performance and higher reliability have long been the focus of research for slotted limited-angle torque motors(LATMs),which are primarily used to position first-stage valves in electrohydraulic *** paper presents a high reliability axial-flux slotted LATM with quasi-Halbach array for torque performance improvement including constant torque range(CTR)and output ***,the structure with two sets of windings and the operation principle of the proposed slotted LATM is ***,a brief design procedure is presented,the structure selections of open slot and double-stator single-rotor(DSSR)interior rotor with surface mounted quasi-Halbach permanent magnet(PM)array are illustrated,and the geometric parameters are optimized to obtain the optimal design of the proposed slotted ***,3-D finite-element method(FEM)is employed to compare the proposed slotted LATM with the conventional surface mounted PM slotted LATM in terms of cogging torque,no-load back EMF,and output torque,and the results show that the proposed LATM with quasi-Halbach array has a 10%improvement in output torque and a 25%improvement in ***,the flux linkages and torque performance of the two sets of windings under various conditions verify good magnetic ***,prototypes of two different rotor types are manufactured and a series of experiments are performed to validate the analysis.

关键词： Limited-angle torque motor(LATM) Axial-flux machine Quasi-Halbach array Finite-element method(FEM) Cogging torque Torque performance

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Development of a toroidal soft x-ray imaging system and application for investigating three-dimensional plasma on J-TEXT

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Plasma Science and technology 2024年第3期26卷 94-99页

作者：赵传旭李建超张晓卿王能超丁永华杨州军江中和严伟李杨波毛飞越任正康 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 Engineering and School of PhysicsHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205People's Republic of China 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

A toroidal soft x-ray imaging(T-SXRI)system has been developed to investigate threedimensional(3D)plasma physics on *** T-SXRI system consists of three sets of SXR *** sets are newly developed and located on the vacuum chamber wall at toroidal positionsφof 126.4°and 272.6°,respectively,while one set was established previously atφ=*** set of SXR arrays consists of three arrays viewing the plasma poloidally,and hence can be used separately to obtain SXR images via the tomographic *** sawtooth precursor oscillations are measured by T-SXRI,and the corresponding images of perturbative SXR signals are successfully reconstructed at these three toroidal positions,hence providing measurement of the 3D structure of precursor *** observed 3D structure is consistent with the helical structure of the m/n=1/1 *** experimental observation confirms that the T-SXRI system is able to observe 3D structures in the J-TEXT plasma.

关键词： SXR imaging J-TEXT tokamak three-dimensional measurement MHD

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Study of Star-Delta Soft Switch to Extend AC Motor High Speed Operation Region

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CES Transactions on Electrical Machines and Systems 2023年第3期7卷 248-255页

作者： Yixuan Shuai Dong Jiang Zhuo Chen Zicheng Liu Haijing Sun Peng Li IEEE State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

In traction application,speed range of motor is an important index for motor *** AC motor control,the maximum speed of the motor is limited by the output voltage capability of the traditional three-phase inverter with star connenction of *** the star connection to delta connection in high-speed range can extend the speed *** order to extend the speed operation region,star-delta switch proposed by many literatures relies on mechanical relay,which needs a dead zone of tens of milliseconds and seriously affects torque ***,the traditional method will cause current overshoot during the switch transient process,decreasing the device security and *** at the defects existing in the star-delta hard switching,this paper proposes a star-delta soft switching *** adding extra power electronics devices,DC-bus capacitor is used to provide the path of zero axis current in the transient process,which helps to achieve the smooth torque output and zero current switch in the *** have been done to validate the performance of the proposed *** switching transient from star to delta connection in the motor drive can be much more stable than hard switching method.

关键词： Speed range Soft switch 0-axis current Zero current switch

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Reliability criterion of film capacitor based on moisture diffusion in encapsulation

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High Voltage 2023年第6期8卷 1242-1252页

作者： Zheng Li Hua Li Tian Qiu Fuchang Lin Yucheng Wang School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhanChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina Key Laboratory of Pulsed Power Technology Ministry of EducationWuhanChina

The current reliability criterion(RC)of the film capacitor(FC)is usually a fixed value,which does not consider the staged capacitance loss caused by moisture diffusion under high temperature and/or high *** expected lifetime of capacitors would deviate far from the actual *** moisture diffusion process of the encapsulated FC is ana-lysed based on Fick's second *** order to investigate the capacitance loss and moisture diffusion characteristics,4 types of film capacitors are stressed with AC voltage under different temperatures and *** on the staged analysis of the capacitance and weight gain curves,the effect of moisture diffusion on capacitance loss is *** indicate that the linear stage of capacitance loss corresponds to the Fickian moisture diffusion stage of weight *** effect of voltage on FC aging is the most *** capacitance loss rate increases by 301%when the voltage rises by 30%.An RC calculation method of the FC is further proposed,which could also screen the encap-sulation quality and shorten the aging test duration by at least 80%.

关键词： aging moisture diffusion

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Prediction of Equivalent Icing Thickness of Transmission Lines in Distribution Network 9

Prediction of Equivalent Icing Thickness of Transmission Lin...

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9th Asia Conference on Power and Electrical engineering, ACPEE 2024

作者： Xu, Jiaxin Li, Dayi Dai, Yufeng Xie, Siqi Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350309638

Aiming at the problem that the time series forecasting method will produce a certain degree of lag due to its series autocorrelation, the multivariate equivalent ice thickness prediction using meteorological data as the feature is used. Aiming at the problem that the prediction accuracy of ice thickness is not high, the attention mechanism is used to assign adaptive weights to multi-dimensional feature parameters and time steps to highlight important information in different feature dimensions and time steps. At the same time, due to the change of ice cover with time, a Bi-directional Long Short-term Memory (Bi-LSTM) is used to establish an ice cover prediction model to make use of the past and future information provided at each time point in the process, and for the parameter selection problem of Bi-LSTM, the sparrow search algorithm (SSA) is used to select the hyperparameters to reduce the error caused by human intervention, and then improve the accuracy of line equivalent ice thickness prediction, and finally verify the validity of the model through experimental results. © 2024 IEEE.

关键词： Long short-term memory

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Loosely coordinating diluted highly concentrated electrolyte toward -60℃ Li metal batteries

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Journal of Energy Chemistry 2024年第3期90卷 380-387,I0009页

作者： Han Zhang Ziqi Zeng Qiang Wu Xinlan Wang Mingsheng Qin Sheng Lei Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Lithium metal batteries(LMBs) promise energy density over 400 Wh kg^(-1).However,they suffer severe electrochemical performance deterioration at sub-zero *** failure behavior highly correlates to inferior lithium metal anode(LMA) compatibility and sluggish Li^(+) ***,we demonstrate that cyclopentylmethyl ether(CPME) based diluted high-concentration electrolyte(DHCE)enables-60℃ LMBs *** leveraging the loose coordination between Li^(+) and CPME,such developed electrolyte boosts the formation of ion clusters to derive anion-dominant interfacial chemistry for enhancing LMA compatibility and greatly accelerates Li^(+) desolvation *** resulting electrolyte demonstrates high Coulombic efficiencies(CE),providing over 99.5%,99.1%,98.5% and 95% at 25,-20,-40,and-60℃*** assembled Li-S battery exhibits remarkable cyclic stability in-20,and-40℃ at 0.2 C charging and 0.5 C *** at-60℃,Li-S cell with this designed electrolyte retains> 70% of the initial capacity over 170 ***,lithium metal coin cell and pouch cell with10 mg cm^(-2) high S cathode loading exhibit cycling stability at-20℃.This work offers an opportunity for rational designing electrolytes toward low temperature LMBs.

关键词： Lithium metal batteries -60℃operation Lithium metal anode compatibility Li^(+) desolvation kinetics

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Performance Study of MIMO-OSTBC Parallel Relay FSO System Based on GFDM

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Chinese Journal of Electronics 2024年第2期33卷 564-572页

作者： Rui ZHOU Yong WANG Yi WANG Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province College of Information Engineering China Jiliang University State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University

This paper investigates the performance of a new generalized frequency division multiplexing(GFDM)parallel relay free space optical(FSO) communication system using multi-input multi-output(MIMO) orthogonal space-time block codes(OSTBC) scheme. Under the M distribution atmospheric turbulence, taking into account the triple effects of irradiance, pointing errors and path loss, the mathematical expression of system symbol error rate is derived with the help of Meijer G-function. The symbol error performance of GFDM is compared with on-off keying,Gaussian minimum shift keying, polarization shift keying and orthogonal frequency division multiplexing(OFDM)modulation methods. The effects of the MIMO-OSTBC parallel relay scheme on the GFDM system including filter roll down coefficient, the number of transmitting and receiving antennas, the number of relays, normalized beamwidth and jitter variance are analyzed, and the numerical results are verified by Monte Carlo simulation. This work provides a good foundation for engineering applications.

关键词： Free-space optical Generalized frequency division multiplexing Multi-input multi-output Orthogonal space-time block codes Parallel relay

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High-safety and high-voltage lithium metal batteries enabled by nonflammable diluted highly concentrated electrolyte

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Nano Research 2024年第4期17卷 2638-2645页

作者： Han Zhang Ziqi Zeng Shuping Wang Yuanke Wu Changhao Li Mengchuang Liu Xinlan Wang Shijie Cheng Jia Xie State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Grid Anhui Electric Power Research Institute Anhui Province Key Laboratory of Electric Fire and Safety Protection(State Grid Laboratory of Fire Protection for Transmission and Distribution Facilities)Hefei 230601China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China

Lithium metal batteries(LMBs)show great promise for achieving energy densities over 400 Wh·kg^(-1).However,highly flammable organic electrolytes are a long-lasting problem that triggers safety hazards and hinders the commercial application of ***,a nonflammable diluted highly concentrated electrolyte(DHCE)with ethoxy(pentafluoro)cyclotriphosphazene(PFPN)as a diluent is developed to simultaneously achieve high safety and cycling stability of high-voltage *** optimal DHCE not only ensures reversible Li deposition/dissolution behavior with a superior average Coulombic efficiency(CE)over 99.1%on lithium metal anode(LMA),but also suppresses side reactions and stress crack on the LiCoO_(2)(LCO)under high cut-off *** newly developed DHCE exhibits high thermal stability,showing complete nonflammability and reduced heat generation between the electrolyte and delithiated LCO/cycled *** work offers an opportunity for rational designing nonflammable electrolytes toward high-voltage and safe LMBs.

关键词： lithium metal batteries thermal stability nonflammable electrolyte high-voltage phosphazene

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