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2020 IEEE/IAS Industrial and Commercial Power System Asia, I and CPS Asia 2020

作者： Pan, Chen Lin, Xinchun Quan, Xuli Zheng, Yun Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781728143033

The renewable energy system and power grid are usually connected through a grid-connected converter (GCC), whose transient performance is significantly essential during the grid faults. In actual operation, reactive power compensation devices are often connected to the common coupling point (PCC) to improve voltage stability. However, there is a lack of analysis when considering the influence of reactive power compensation devices on GCC's transient stability. In this paper, the mathematical model of GCC when static var generator (SVG) is adopted for reactive power compensation is established. The AC-side equivalent circuit of the system, the state equation and the output power characteristic curve of GCC are obtained. On this basis, the equal-area criterion (EAC) for GCC is proposed to analyze its transient stability. Finally, the simulation of remote voltage sag under different short circuit ratio (SCR) is carried out to verify the correctness of the theoretical analysis. © 2020 IEEE.

关键词： Stability

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Effect of melting rate on microsegregation and primary MC carbides in M2 high-speed steel during electroslag remelting

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China Foundry 2021年第3期18卷 163-169页

作者： Fu-xing Yin Ming Su Fa Ji Qing-chao Tian Ya-guan Bai Jian-hang Feng Zhi-xia Xiao School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Tianjin Key Laboratory of Layered Composite Materials Tianjin 300130China State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai 200444China Tianjin Heavy Industries Research and Development Co. Ltd.Tianjin 300457China

Large-size primary MC carbides can significantly reduce the performance of M2 high-speed *** better control the morphology and size of primary MC carbides,the effect of melting rate on microsegregation and primary MC carbides of M2 steel during electroslag remelting was *** the melting rate is decreased from 2 kg·min^(-1) to 0.8 kg·min^(-1),the columnar dendrites are gradually coarsened,and the extent of segregation of Mo and V is alleviated,while the segregation of Cr becomes *** 2 kg·min^(-1),the number of primary MC carbides per unit area with the sizes in the range of 2 μm to 6 μm accounts for about 75% of all MC carbides,while the carbides are mainly concentrated on the size larger than 8 μm at 0.8 kg·min^(-1).Thermodynamic calculations based on the Clyne-Kurz (simplified to C-K) model shows that MC carbide can be precipitated in the final solidification stage and a smaller secondary dendrite arm spacing caused by higher melting rate (2 kg·min^(-1) in this experiment) facilitates the refinement of primary MC carbides.

关键词： high-speed steel MC carbide melting rate electroslag remelting microsegregation

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Strenuous exercise-tolerance stretchable dry electrodes for continuous multi-channel electrophysiological monitoring

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npj Flexible Electronics 2022年第1期6卷 745-753页

作者： Ruijie Xie Qingsong Li Lijun Teng Zhengshuai Cao Fei Han Qiong Tian Jing Sun Yang Zhao Mei Yu Dianpeng Qi Peizhi Guo Guanglin Li Fengwei Huo Zhiyuan Liu CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences(CAS)Shenzhen 518055China The Institute of Flexible Electronics(IFE Future Technologies)Xiamen UniversityXiamen361005 FujianChina Key Laboratory of Flexible Electronics(KLOFE) School of Flexible Electronics(Future Technologies)Nanjing Tech University30 South Puzhu RoadNanjing 211816China Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China

Electrophysiological monitoring under strenuous exercise by using stretchable dry electrodes is vital for healthcare monitoring,prosthetic control,human−machine interfaces and other biomedical ***,the existing dry electrodes are not applicable to the strenuous exercise situation that always involves both fast moving and profuse ***,we present a nano-thick porous stretchable dry electrode system with high stretchability and water *** system attaches conformably to the skin and stretches with it under Van der Waals forces even at sweating conditions,allowing the detection of electromyogram when moving with an acceleration of 10 g at a sweating rate of 2.8 mg cm^(−2) min^(−1).It is also capable of acquiring electrocardiogram and electroencephalogram *** strategy proposed would enable the biomedical studies and related applications with the requirement of stably recording electrophysiological signals under strenuous exercise scenarios.

关键词： acceleration recording enable

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Transient and Steady-state Response of AlGaN/GaN Terahertz Detectors under Sinusoidal Excitation of Different Intensities

Transient and Steady-State Response of AlGaN/GaN Terahertz D...

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International Conference on Infrared and Millimeter Waves

作者： Huiting Xia Zhengya Yin Shanshan Jia Lei Cao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Terahertz field effect transistors (TeraFETs) based on AlGaN/GaN materials have high responsivity and sensitivity at room temperature. Based on the hydrodynamic equations, the nonlinear voltage response (transient and steady-state) of this type of THz detector was numerically calculated by finite difference method under THz excitation with different frequencies and intensities. Comparisons with the existing analytical formula and the analysis of the influence of viscosity coefficient on the response were also presented.

关键词： Viscosity Temperature sensors Sensitivity Detectors Voltage Mathematical models Wide band gap semiconductors

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Research on a Fundamental and Harmonic Detection Method Based on D-Q Rotating

Research on a Fundamental and Harmonic Detection Method Base...

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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： Gong, Jie Xue, Feng Zhang, Guangyi Pan, Wenhao Wang, Tingkang 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 in power systems has led to increasingly serious power quality problems in power systems. Active power filters play an important role in governing the harmonics of power systems. The fast and accurate detection of fundamental and harmonic currents in power systems is one of the key aspects of power filters to manage harmonics. In this paper, a new detection method for the fundamental or the nth harmonic component of the fundamental by presetting the frequency of the d-q conversion matrix is proposed. Analysis of simulation results shows that the detection method is not affected by the voltage distortion or asymmetry of the three-phase circuit, and that the results for fundamental and harmonic detection. The ability to accurately reflect changes in frequency and amplitude excursions. © Published under licence by IOP Publishing Ltd.

关键词： Harmonic analysis

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Highly efficient Quantum Rods LEDs for LCD backlights

Highly efficient Quantum Rods LEDs for LCD backlights

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International Conference on Display technology, ICDT 2022

作者： Srivastava, Abhishek Kumar State Key Laboratory of Advanced Displays and Optoelectronics Technologies Centre for Display Research IAS Center for Quantum Technologies Department Electronic and Computer Engineering The Hong Kong University of Science and Technology Hong Kong

Efficient white LEDs with efficacy of > 200 lm/W are much desirable for lighting and displays. LCDs is the market leader with an approximate 70% market share, particularly in the medium-to large-size display segment. The largest portion of power consumption for LCDs belongs to LCD backlight, accounting for 70%– 80% of the total power consumption, which strongly depends on the content and resolution of display panels. [1-8] The polarizer and color filters are the two main components responsible for high-power consumption. Although the phosphor-based LED backlights are much more efficient than the CCFL backlight, the efficiency of display backlight LEDs varies in the range of 70–85 lm/W. A large portion of the phosphor-based LED light is lost in color filters [1-5]. The LED efficacy further decreases at the high brightness required for outdoor applications [4]. Intensive efforts have been made to replace the phosphor with quantum dots-based downconverters, but the efficiency and stability of these devices are still in their infancy. Quantum rods (QRs), the elongated shape nanoparticles, show superior properties such as relatively larger Stokes shifts, polarized emission, and high light out-coupling efficiency in the solid-state. The challenges are as follows: 1. high quantum yield of QRs in the thin solid films covering the whole visible range;2. good in-plane alignment of the QRs on the LEDs;and 3. high photo-stability and low-temperature quenching. In this talk, we will try to discuss all these challenges. We will also discuss the merits of gradient alloyed CdSe/ZnXCd1-XS/ZnS and CdSe/CdS/ZnS core/shell/shell QRs downconverters showing high efficacy LEDs covering a wide color gamut. These QRs-based LEDs attain the luminous efficacy (LE) of 149 lm/W (@10mA), wide color gamut (118% NTSC), which is exceedingly higher than the state-of-the-art quantum dot and phosphor-based on-chip LED, which paves the way for the future display backlight with the efficacy of > 200 lm/W

关键词： Semiconductor quantum dots

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Modelling of Renewable-energy-base Heat and Power System and Regulation Method Study

Modelling of Renewable-energy-base Heat and Power System and...

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2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Li, Zhenxing Zhou, Jianyu Chen, Xia Wen, Jinyu 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)9781728191645

The traditional combined heat and power (CHP) systems rely on fossil energy sources. Most of the recent research on the CHP system is static analysis, and the lack of dynamic mechanism research makes the system's regulation inaccurate. This paper develops a renewable-energy-base heat and power (REHP) system. The whole system can be divided into several modules through modular decomposition. The dynamic mechanism is analyzed for each module and the corresponding model is constructed. Based on each module, a simulation platform that can reflect the system's dynamics is constructed. To overcome the fluctuation of renewable energy and stabilize the energy output of RECHP, a real-time regulation method is proposed. The simulation results verify the effectiveness of the constructed simulation model and the regulation method. © 2020 IEEE.

关键词： Renewable energy resources

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Novel Multifunctional Transient Voltage Suppressor technology for Modular EOS/ESD Protection Circuit Designs 35

Novel Multifunctional Transient Voltage Suppressor Technolog...

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35th International Symposium on Power Semiconductor Devices and ICs, ISPSD 2023

作者： Qi, Zhao Qiao, Ming Wei, Jingqi Shi, Yonggang Chen, Hongquan Li, Zhaoji Zhang, Bo University of Electronic Science and Technology of China State Key Laboratory of Electronic Thin Films and Integrated Devices Chengdu China Chongqing Institute of Microelectronics Industry Technology Uestc Chongqing China Institute of Electronic and Information Engineering of Uestc in Guangdong Dongguan China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen China

ISBN: (纸本)9798350396829

Transient voltage suppressor (TVS) is a kind of widely-used protection device which can enhance system surge and electrostatic discharge (ESD) robustness in small PCB area. However, different TVS cannot be fabricated using same technology due to the huge characteristic difference, which brings technology complexity in multifunctional system. In order to unity the TVS designs, a novel multifunctional TVS technology which solves non-uniformity finger triggering, voltage stacking and low leakage modular assembly issues is proposed. By using this TVS technology, the low-capacitance TVS array gets the peak current (IPP)of 5 A under the line-line capacitance (CL-L) of 0.25 pF, 5 V power clamp gets the IPP of 10 A with the dynamic resistance (Rdyn) of 0.15 Ohm, high-voltage protection diode gets the breakdown voltage (BV) of 70 V by stacking eight units and the surge TVS realizes IPP of 320 A by increasing finger amount without non-uniformity triggering. © 2023 IEEE.

关键词： Capacitance

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Fast Continuous 2π Phase Modulation using Defect-free Deformed Helix Ferroelectric Liquid Crystals

Fast Continuous 2π Phase Modulation using Defect-free Defor...

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Digital Holography and Three-Dimensional Imaging, DH 2022

作者： Sun, Zhi-Bo Yuan, Zheng-Nan Kwok, Hoi Sing Srivastava, Abhishek K. State Key Laboratory on Advanced Displays and Optoelectronics Technologies Center for Display Research Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

In this paper, we propose a fringe-field-effect-free fast (250μs) continuous 2π phase modulation using defect-free deformed helix ferroelectric liquid crystal (DHFLC) with high efficiency (> 90%) for the first ti... 详细信息

ISBN: (纸本)9781957171128

关键词： Pixels

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Boosting energy storage performance of low-temperature sputtered CaBi_(2)Nb_(2)O_(9) thin film capacitors via rapid thermal annealing

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Journal of advanced Ceramics 2021年第3期10卷 627-635页

作者： Jing YAN Yanling WANG Chun-Ming WANG Jun OUYANG Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China Institute of Advanced Energy Materials and Chemistry School of Chemistry and Chemical EngineeringShandong Provincial Key Laboratory of Molecular EngineeringQilu University of Technology(Shandong Academy of Sciences)Jinan 250353China College of Physics and Electronic Engineering Qilu Normal UniversityJinan 250013China Amperex Technology Limited Ningde 352100China School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China

CaBi_(2)Nb_(2)O_(9) thin film capacitors were fabricated on SrRuO_(3)-buffered Pt(111)/Ti/Si(100)substrates by adopting a two-step fabrication *** process combines a low-temperature sputtering deposition with a rapid thermal annealing(RTA)to inhibit the grain growth,for the purposes of delaying the polarization saturation and reducing the ferroelectric *** using this method,CaBi_(2)Nb_(2)O_(9) thin films with uniformly distributed nanograins were obtained,which display a large recyclable energy density Wrec≈69 J/cm^(3) and a high energy efficiencyη≈82.4%.A superior fatigue-resistance(negligible energy performance degradation after 10^(9) charge-discharge cycles)and a good thermal stability(from-170 to 150℃)have also been *** two-step method can be used to prepare other bismuth layer-structured ferroelectric film capacitors with enhanced energy storage performances.

关键词： bismuth layer-structured ferroelectrics(BLSFs) calcium bismuth niobate(CaBi_(2)Nb_(2)O_(9)) nanograin films rapid thermal annealing(RTA) energy storage fatigue-resistance

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