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

作者： Lin Gan Changsong Chen Shuran Jia Bowen Cui Xiayan 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: (数字)9798331530174

ISBN: (纸本)9798331530181

A multi-unit bidirectional inductive power transfer (BIPT) system is suitable as a wireless energy trading platform for electric vehicles (EVs). Phase synchronization technique is required to implement flexible power flow pattern of such system. Traditional method utilizes dedicated synchronization module, which will increase the complexity and the cost of system. This article proposed a multi-unit BIPT system with power-synchronization controlled subunits. The resemblance between the multi-unit BIPT system and the traditional power grid dominated by synchronous machines is revealed. A power-synchronization method is proposed for the multi-unit BIPT system, which can significantly reduce the complexity and the cost of system because neither extra coils nor extra high-speed, high-precision detection and conditioning circuits are required. Experimental verification is carried out to verify the grid-to-vehicle (G2V) and vehicle-to-grid (V2G) capability of the multi-unit BIPT system and the effectiveness of the proposed power-synchronization method.

关键词： Wireless communication Coils Vehicle-to-grid Costs Control systems Power grids Complexity theory Synchronization Synchronous machines Load flow

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Effect of phosphate conversion film on fatigue and corrosion fatigue behavior of an as-rolled Mg–3.08Zn–0.83Al(in wt.%)alloy

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Journal of Iron and Steel Research International 2023年第12期30卷 2557-2565页

作者： Bao-jie Wang Dao-kui Xu Shuo Wang Xiang-bo Xu En-hou Han School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159LiaoningChina Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016LiaoningChina Binzhou Institute of Technology Binzhou256606ShandongChina Shandong Key Laboratory of Advanced Aluminium Materials and Technology Binzhou256606ShandongChina Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819LiaoningChina

Through investigating and comparing the fatigue behavior of an as-rolled Mg–3.08Zn–0.83Al(in wt.%)alloy performing surface phosphate conversion film treatment,it revealed that the determined fatigue strength of surface treated samples at 106 cycles in air was 65 MPa,whereas the fatigue strength was only 35 MPa when tested in 3.5 wt.%NaCl *** analysis demonstrated that in air,the fatigue crack initiation was mainly dominated by the interaction between the retarding effect of phosphate conversion film on cyclic slips occurring in the underneath *** the matrix cannot endure the accumulated stress concentration due to the irreversibility of cyclic slips,the fatigue crack will preferentially initiate at sample *** the phosphate conversion film cracked easily under the cyclic loading and lost its protectiveness on the substrate in 3.5 wt.%NaCl solution,fatigue cracks were preferentially nucleated at the localized corrosion pits.

关键词： Mg alloy Corrosion fatigue Surface film Pitting Crack initiation

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Real-time State Prediction Based Coordinated Control Strategy of LIQHYSMES

Real-time State Prediction Based Coordinated Control Strateg...

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

作者： Qi Liu Jing Shi Jiachen Zhou Siwei Cheng Qi Cheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

LIQHYSMES (Liquid hydrogen with superconducting magnetic energy storage) offers rapid response, substantial capacity, and low energy conversion losses, making it ideal for large scale renewable energy integration and power grid stability. However, challenges remain in fully coordinated utilization of the storage units and safe, stable operation of the storage magnets. Accurate state prediction and control are vital for the efficient operation and coordination of LIQHYSMES. This paper proposes a state prediction based LIQHYSMES coordinated control strategy. Firstly, a superconducting magnet state prediction model based on the random forest algorithm is established. Secondly, the coordinated control strategy is outlined. Finally, simulation analysis validates the prediction model and control strategy, demonstrating their accuracy and effectiveness.

关键词： Renewable energy sources Accuracy Hydrogen Superconducting transmission lines Magnetic liquids Predictive models Superconducting magnets Prediction algorithms Stability analysis Superconducting magnetic energy storage

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Analysis of cesium distribution for negative ion sources: SID diagnosis and Monte-Carlo simulation

Analysis of cesium distribution for negative ion sources: SI...

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IEEE International Conference on Plasma Science (ICOPS)

作者： F. Xue C. Zuo D. Li D. Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350360912

ISBN: (纸本)9798350360929

Cesium evaporation is commonly adopted in negative ion sources to form appropriate cesium coverage on the converter surface which lowers surface work function, thus improving negative ion production. The surface coverage of cesium is influenced by oven evaporation rate (controlled by the oven heating temperature) and wall sticking coefficient (influenced by the wall temperature). To investigate cesium transportation in chamber and to optimize cesium condition for future cesium injection in the HUST negative ion source, experiments are carried out in the cesium test stand with surface ionization detector (SID), including the oven SID and two movable SIDs along axis and radius direction, under adjusted oven temperatures and wall temperatures, to simulate the actual working conditions in negative ion sources. A Monte-Carlo model is established to carry out analysis, providing the relationship of cesium distribution and wall sticking coefficient under certain oven evaporation rates. With the oven evaporation rate obtained based on the oven SID, the wall sticking coefficient under various wall temperatures is acquired by comparing the experimental results of movable SIDs with simulation. The results show the relationship between cesium distribution under different oven evaporation rates and wall temperatures, along with wall sticking coefficients calculated.

关键词： Temperature distribution Monte Carlo methods Ovens Transportation Production Ion sources Cesium

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Discharge and post-explosion behaviors of electrical explosion of conductors from a single wire to planar wire array

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Plasma Science and technology 2022年第1期24卷 151-164页

作者： Chen LI Ruoyu HAN Yi LIU Jinlin ZHAO Yanan WANG Feng HE Jiting OUYANG Research Center for Electrostatics and Applications Beijing Institute of TechnologyBeijing 100081People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'an 710049People’s Republic of China

This work deals with an experimental study of a Cu planar wire array(PWA)in air and water under the stored energy 300-1200 J.A single Cu wire is adopted as a controlled *** configurations of PWA and a wire with the same mass(cross-section area)but the different specific surface areas(15-223 cm^(2)g^(-1))are *** transient process is analyzed using high-speed photography in combination with the results of optical emission and *** characteristics revealed that PWA always has a higher electric power peak,early but higher voltage peak,as well as faster vaporization and ionization process than the single-wire *** to three times stronger optical emission could be obtained when replacing the single-wire with PWA,indicating a higher energy-density state is ***,in both air and water,single-wire load tends to develop a transverse stratified structure,while PWA is dominated by the uneven energy deposition among ***,the synchronism and uniformity of the PWA explosion are discussed.

关键词： electrical explosion wire array metal plasma plasma radiation shock wave

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Variable dead zone pulse width modulation to reduce conducted electromagnetic interference

Variable dead zone pulse width modulation to reduce conducte...

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China Power Supply Society electromagnetic Compatibility Conference (CPEMC)

作者： Hui Liu Dong Jiang She Yan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331509552

ISBN: (纸本)9798331509569

The switching of the switch will produce a lot of electromagnetic interference (EMI). The time scale of the dead zone is very small, and the actual conduction situation is determined by the direction of the current, and therefore affects the EMI at the MHz level. Based on the principle of spread spectrum modulation, a pulse width modulation (PWM) technique with variable dead zone (VDZ) is proposed in this paper. The simulation and experimental results show that the differential mode EMI can be reduced by about 5dB at 600kHz-5MHz by using VDZPWM at a constant switching frequency.

关键词： Power supplies Switching frequency electromagnetic interference Switches Pulse width modulation electromagnetic compatibility

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Optimization Methodologies for Uncertainty Characterization with Large-Scale Renewables Integration 4th

Optimization Methodologies for Uncertainty Characterization ...

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4th International Conference on Energy Power and Automation engineering, ICEPAE 2023

作者： Wang, Miao Li, Zeke Sun, Bo Fan, Haiwei Hu, Xin Ding, Linglong China Electric Power Research Institute Beijing100192 China State Grid Fujian Electric Power Co. LTD Fuzhou350003 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819988778

The increasing penetration of renewable sources into the power grid brings uncertainty of active power on both the generation side and demand side also increases significantly. Power grid dispatching needs to be transformed from deterministic optimization to uncertain optimization. The scenario-based, stochastic programming, and robust optimization methods are optimization methods that can be used to characterize the uncertainty of renewable energy generation and improve power grid dispatching. This paper utilizes three methods to characterize the uncertainty of renewable output and employs a series of techniques to convert these methods into optimization that can be directly handled by existing solvers. An evaluation of each method is provided at the end. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Stochastic programming

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A composite enhanced fog water collection method combining plasma and asymmetric wetting microstructure

A composite enhanced fog water collection method combining p...

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IEEE International Conference on Plasma Science (ICOPS)

作者： D. Li C. 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: (数字)9798350360912

ISBN: (纸本)9798350360929

Fog water collection can effectively alleviate the water scarcity problem faced by humanity. In order to achieve this goal, electrostatic fog water collection has become an emerging technology that is receiving significant attention. Although electrostatic fog water collection technology has advantages such as convenience and economy, there are currently some issues that limit its widespread adoption, such as low collection efficiency, high operating voltage, and power consumption. Furthermore, there is a lack of in-depth understanding and mechanism research of this technology, which hinders the development and optimization of related devices. First, the charging mechanism and force acting on the fog droplets were analyzed, and it was clarified that field-induced charging is the dominant charging mechanism. The motion equation of charged fog droplets was established, providing theoretical guidance for the design of electrostatic fog water collection devices. Subsequently, the corona discharge characteristics in the electrostatic fog water collection device and the discharge process of the nanoelectrode were studied using a multi-scale multi-source discharge model, providing important references for optimizing device performance. In terms of experiments, an electrostatic fog water collection experimental platform was established to study the influence of electrical factors and environmental factors on the collection efficiency. At the same time, micro-nano technology enhancement methods were proposed to improve the electrode surface, thereby enhancing the discharge performance, droplet transport capacity, and collection efficiency of the device. Based on the research results, a new type of electrostatic fog water collection device with high efficiency, low power consumption, and stable operation was designed. Ultimately, a fog water collection efficiency of 96% was achieved, while reducing the operating voltage by 30%. In conclusion, the effective utilization of wate

关键词： Performance evaluation Water Power demand Surface discharges Voltage Mathematical models Plasmas

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An application of the shortest path algorithm for the identification of weak MHD mode

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Plasma Science and technology 2023年第8期25卷 19-27页

作者：黄卓毛飞越丁永华田微黄名响李达沈呈硕王能超梁云峰 the J-TEXT Team College of Computer Science South-Central Minzu UniversityWuhan 430074People'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 Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich 52425Germany 不详

The identification of magnetohydrodynamic(MHD)modes is a crucial issue in the control of magnetically confined *** paper proposes a novel method for identifying the evolution of MHD modes from a signal with a low signal-to-noise *** proposed method generates a weighted directed graph from the time-frequency spectrum and calculates the evolution of the mode frequency by solving the shortest *** method addresses the limitations posed by the lack of data channels and the disturbance of noise in the estimation of mode frequency and yields much better results compared to traditional *** is demonstrated that,using this method,the evolution of an unlocked tearing mode was more accurately calculated on the J-TEXT *** method remains feasible even with a low signal-to-noise ratio of 0.5,as shown by its ***,with appropriate parameters,this method can be applied to not only signals with MHD modes,but also to general signals with continuous modes.

关键词： plasma physics magnetohydrodynamic pattern recognition

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Research and Analysis of Equivalent Circuit Model for Core Snubber

Research and Analysis of Equivalent Circuit Model for Core S...

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2022 International Conference on Smart Energy and Electrical engineering, SEEE 2022

作者： Li, Zhiheng Ma, Shaoxiang Wang, Yongmao Zhu, Bangyou Zhang, Hongqi Zhang, Ming Pan, Yuan Yu, Kexun 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 Wuhan Second Ship Design and Research Institute Wuhan430205 China

The ion source is the key to the NBI. It is very sensitive to overvoltage and overcurrent, and the breakdown frequently occurs between the acceleration grid. The core snubber is the most suitable surge suppression device to achieve DC fault protection. This paper introduces some basic concepts, comparing the core snubber's material properties and important parameters. It also introduces the basic concept of an equivalent circuit model for snubber, including the derivation process and theoretical analysis. Then the characteristics of the snubber and surge suppression analysis are introduced. Finally, this paper looks forward to the future research direction of the snubber. © Published under licence by IOP Publishing Ltd.

关键词： Ion sources

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