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16th International Conference on Signal Processing Systems, ICSPS 2024

作者： Gu, Shenao Guo, Muran Key Laboratory of Advanced Marine Communication and Information Technology AVIC United Technology Center for Electromagnetic Spectrum Collaborative Detection and Intelligent cognition College of Information and Communication Engineering Harbin Engineering University Harbin150001 China

ISBN: (纸本)9781510689251

Conformal antennas typically utilize short dipoles to reduce space occupation. Conformal antenna arrays are essentially polarization-sensitive arrays with broad applicability and enhanced anti-interference capabilities. However, a practical issue that needs to be addressed is the high power consumption and resource usage resulting from high-resolution analog-to-digital converters (ADCs). In this paper, we introduce the mixed-resolution quantization method into the conformal array to alleviate the pressure on resource transmission by partially reducing the quantization resolution. The receive signal model is constructed in this paper, and a rank-deficient MUSIC algorithm suitable for the proposed scheme is developed. The direction of arrival (DOA) parameters, as well as the polarization parameters, are estimated with considerable accuracy. The power consumption and system cost are effectively reduced with a small sacrifice on parameter estimation accuracy. Numerical simulations validate the feasibility of proposed mixed-quantized conformal array. © 2025 SPIE.

关键词： Direction of arrival

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Analysis of Three-Phase Short-Circuit Electromotive Force on Six Vacuum-Break Parallel-Type Generator Outlet Circuit Breakers 11th

Analysis of Three-Phase Short-Circuit Electromotive Force on...

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11th Frontier Academic Forum of Electrical engineering, FAFEE 2024

作者： Sun, Likang Chen, Lixue He, Yinghui Zou, Xinyang Li, Yingzhuo State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819787791

Currently, vacuum type generator outlet circuit breaker dominates the large-capacity generator circuit breaker. However, due to the large short-circuit current at the generator outlet end, the generator outlet circuit breaker needs to bear a great short-circuit electromotive force, thus affecting its dynamic stability. In this paper, COMSOL is used to construct a model of a six vacuum break parallel type outlet circuit breaker for the protection of a megawatt-level generator. Based on Maxwell's electromagnetic theory, the transient calculation of three-phase short-circuit electromotive force under different phases is carried out for the generator outlet vacuum circuit breaker, and the great values of short-circuit electromotive force under different phases are obtained for each phase. The results show that the main component of the short-circuit electromotive force is the electromotive force in the y-direction. And based on the maximum transient electromotive force, the influence of the material on the short-circuit electromotive force is studied, which provides theoretical support for the analysis of the short-circuit electromotive force of the generator outlet circuit breaker and the optimized design of the shell. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Electric shielding

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Enabling superior electrochemical performance of NCA cathode in Li_(5.5)PS_(4.5)Cl_(1.5)-based solid-state batteries with a dual-electrolyte layer

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Chinese Chemical Letters 2024年第4期35卷 231-236页

作者： Ziling Jiang Shaoqing Chen Chaochao Wei Ziqi Zhang Zhongkai Wu Qiyue Luo Liang Ming Long Zhang Chuang Yu School of Chemistry and Chemical Engineering Huazhong 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 Innovation Center for Chemical Sciences College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China College of Physics and Energy Fujian Normal UniversityFuzhou 350117 China

LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2)(NCA) is a promising cathode for sulfide-based solid-state lithium batteries(ASSLBs)profiting from its high specific capacity and voltage plateau, which yielding high energy density. However, the inferior interfacial stability between the bare NCA and sulfides limits its electrochemical performance. Hereien, the dual-electrolyte layer is proposed to mitigate this effect and enhance the battery performances of NCA-based ASSLIBs. The Li_(3)InCl_6 wih high conductivity and excellent electrochemcial stability act both as an ion additives to promote Li-ion diffusion across the interface in the cathode and as a buffer layer between the cathode layer and the solid electrolyte layer to avoid side reactions and improve the interface stability. The corresponding battery exhibits high discharge capacities and superior cyclabilities at both room and elevated temperatures. It exhibits discharge performance of 237.04 and216.07 m Ah/g at 0.1 and 0.5 C, respectively, when cycled at 60 ℃, and sustains 95.9% of the capacity after100 cycles at 0.5 C. The work demonstrates a simple strategy to ensure the superior performances of NCA in sulfide-based ASSLBs.

关键词： LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2) Li_(5.5)PS_(4.5)Cl_(1.5) Double solid electrolyte layer configuration Operating temperatures Electrochemical performances

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Multiple discharges before leader inception in long air gaps under positive switching impulses

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High Voltage 2023年第1期8卷 111-118页

作者： Xiangen Zhao Juhyeong Lee Gang Liu Lei Jia Yang Liu Junjia He Yaping Du Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityHung HomHong KongChina Department of Mechanical and Aerospace Engineering Utah State UniversityLoganUtahUSA State Key Laboratory of HVDC Transmissions Technology Electric Power Research InstituteChina Southern Power GridGuangzhouChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina

There are multiple corona bursts before leader inception when the rising rate of the applied voltage or electric field is not sufficiently high enough in long positive *** existing studies,no attention has been paid to whether these corona bursts occur in the same location,and they are mostly considered directly as belonging to the same ***,this paper presents that in a typical rod-plate long air gap,the multiple corona bursts before leader inception are distributed in at least two different locations,and the highest probability of three discharges ***,the discharge occurs with the highest probability in the time sequence‘tip-tip-side-tip-other side’of the electrode in the first five corona *** each discharge,the first corona current is a single,double exponential pulse,while the following corona currents are mostly a superposition of multiple *** above findings are mainly based on experiments in a 1.4 m air gap under positive switching impulses,in which the voltage,current,and high-speed images were recorded ***,based on the experimental results,this paper discusses the effects brought by ignoring the multiple discharges on key parameters of leader inception and makes some suggestions to optimise long spark experiments.

关键词： positive exponential superposition

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Island-Oriented Multi-Energy Reef Pan Power Plant and Its Application - Layout Optimization Study and Capacity Exploration

Island-Oriented Multi-Energy Reef Pan Power Plant and Its Ap...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： He, Weijie Wei, Fanrong Lin, Xiangning Dawoud, Samir M. School of Electrical and Electronic Engineering Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Tanta University The Department of Electrical Power and Machines Engineering Tanta Egypt

ISBN: (纸本)9798331530174

In response to the problem of unreasonable power supply layout on islands, this paper fully evaluates the status of wind/light/wave energy resources in the island and its surrounding reef area scenarios. Then, based on bladeless wind turbines, floating solar panels and oscillating float wave energy capture devices, an integrated construction layout plan for multi-energy reef power stations was proposed. And with the maximum annual total power generation as the objective function, a layout optimization and capacity exploration model was established. The CPLEX mixed integer programming algorithm was used to solve the model example. The example results show that the construction layout plan proposed in this paper is reasonable and feasible, and has unique advantages in island scenarios. © 2024 IEEE.

关键词： Reefs

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Design and Analysis of Coupled Self-charging Mechanical DC Circuit Breaker

Design and Analysis of Coupled Self-charging Mechanical DC C...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Xie, Yunlong Yuan, Zhao Chen, Lixue State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819620456

Mechanical DC circuit breakers have become an irreplaceable part of flexible DC power grids because of their advantages of high economy, low con-duction impedance, and reliable control. However, the large volume of the charging circuit and the high interruption pressure in low current are still the problems it faces. To address the aforementioned issues, a Coupled Self-charging Mechanical DC Circuit Breaker (CSC-DCCB) is proposed. This innovative solution mitigates the risk of switch arc reignition during the commutation process by incorporating a self-charging circuit. The energy consumption process of metal-oxide varistor will cause the capacitor to complete recharging, and this voltage will be used for the reclosing of the CSC-DCCB. Secondly, the parameter of the CSC-DCCB is optimized to achieve a lower overall capacity of the circuit breaker and the rated voltage of the converter switches, which retains the traditional low conduction loss. Finally, the feasibility of CSC-DCCB is validated through PSCAD, the technical parameters of CSC-DCCB are compared with traditional DCCB, showing that CSC-DCCB has better economic efficiency. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Flexible electronics

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Modulation Strategy for Cascaded DC/DC Converter through Integration of CLLLC and Six-Switch Buck-Boost Topology

Modulation Strategy for Cascaded DC/DC Converter through Int...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Qu, Erya Zhang, Yu He, Meng Chen, Yangfan State Key Laboratory of Advanced Electromagnetic China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology WuHan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic School of Electrical and Electronic Engineering WuHan China

ISBN: (纸本)9798350307832

This paper proposes a cascaded DC/DC converter which integrates the six-switch Buck-Boost circuit with CLLLC converter by sharing a bridge arm and shows advantages of bidirectional energy flow, high voltage rating, high efficiency and wide input voltage range. First, an alternative PWM strategy (APWM) for the six-switch Buck-Boost circuit is proposed to balance its flying capacitor voltage. Next, a control method for both current ripple optimization and power control (CRO-PC) is proposed which can reduce 73.5% of current ripple. Finally, a 2 kW/ 20 kHz prototype was built to demonstrate the performance of the proposed method. © 2023 IEEE.

关键词： Buck-Boost converter

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Effect of icosahedral phase formation on the stress corrosion cracking(SCC)behaviors of the as-cast Mg-8%Li(in wt.%)based alloys

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Journal of Magnesium and Alloys 2024年第1期12卷 225-236页

作者： Shuo Wang Daokui Xu Dongliang Wang Zhiqiang Zhang Baojie Wang Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Engineering Research Center of Advanced Materials Preparing Technology Ministry of EducationNortheastern UniversityShenyang110819China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159China Binzhou Institute of Technology BinzhouShandong Province256606China Shandong Key Laboratory of Advanced Aluminium Materials and Technology BinzhouShandong Province256606China

Through exploring the stress corrosion cracking(SCC)behaviors of the as-cast Mg-8%Li and Mg-8%Li-6%Zn-1.2%Y alloys in a 0.1 M NaCl solution,it revealed that the SCC susceptibility index(I_(SCC))of the Mg-8%Li alloy was 47%,whilst the I_(SCC)of the Mg-8%Li-6%Zn-1.2%Y alloy was 68%.Surface,cross-sectional and fractography observations indicated that for the Mg-8%Li alloy,theα-Mg/β-Li interfaces acted as the preferential crack initiation sites and propagation paths during the SCC *** regard to the Mg-8%Li-6%Zn-1.2%Y alloy,the crack initiation sites included the I-phase and the interfaces of I-phase/β-Li andα-Mg/β-Li,and the preferential propagation paths were the I-phase/β-Li andα-Mg/β-Li ***,the SCC of the two alloys was concerned with hydrogen embrittlement(HE)mechanism.

关键词： Magnesium-lithium alloy Stress corrosion cracking I-phase Fracture analysis

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Design of Power Supply for FRC Plasma Thruster Driven by Pulsed RMF

Design of Power Supply for FRC Plasma Thruster Driven by Pul...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Zhang, YiSong Yang, Yong Huang, Yuxuan Yi, Xiaopeng Lv, Chaofan Rao, Bo Lv, Fangwei Zhang, Ming School of Electrical and Electronic Engineering Huazhong University of Science and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

The Field-reversed configuration (FRC) plasma thruster is a propulsion device driven by Pulsed Rotating magnetic field (RMF) to generate thrust. An FRC plasma thruster prototype has been built. The RMF antennas are designed with very high parameters namely a peak current of 4 kA, a resonant frequency of 150 kHz. Thus, a high voltage, high current pulsed power supply is required to satisfy the design. This article mainly presents the challenges and solutions in the design of the power supply system. First, 4 sets of power supplies are used to feed the RMF coils, which results in design parameters of 4 kA/3.5 kV for each power supply. Then, stray parameters control and loss analysis were done to improve power supply efficiency. Experimental tests are also performed on the system. In conclusion, the designed power supply system can satisfy the requirements of high operation parameters and high controllability. © 2024 IEEE.

关键词： Pulsed plasma thrusters

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Investigation of the J-TEXT plasma events by k-means clustering algorithm

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Plasma Science and technology 2023年第8期25卷 38-43页

作者：李建超张晓卿张昱 Abba Alhaji BALA 柳惠平周帼红王能超李达陈忠勇杨州军陈志鹏董蛟龙丁永华 the J-TEXT Team 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 Department of Physics Federal University DutseJigawa 720101Nigeria 不详

Various types of plasma events emerge in specific parameter ranges and exhibit similar characteristics in diagnostic signals,which can be applied to identify these events.A semisupervised machine learning algorithm,the k-means clustering algorithm,is utilized to investigate and identify plasma events in the J-TEXT *** method can cluster diverse plasma events with homogeneous features,and then these events can be identified if given few manually labeled examples based on physical understanding.A survey of clustered events reveals that the k-means algorithm can make plasma events(rotating tearing mode,sawtooth oscillations,and locked mode)gathering in Euclidean space composed of multi-dimensional diagnostic data,like soft x-ray emission intensity,edge toroidal rotation velocity,the Mirnov signal amplitude and so *** on the cluster analysis results,an approximate analytical model is proposed to rapidly identify plasma events in the J-TEXT *** cluster analysis method is conducive to data markers of massive diagnostic data.

关键词： k-means cluster analysis plasma event machine learning

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