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Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)

作者： Qihui Fu Zishun Peng Zipeng Ke Huimin Quan Zhenxing Zhao Zeng Liu Yuxing Dai Jun Wang College of Electrical and Information Engineering Hunan University Changsha China National-Local Joint Engineering Laboratory for Digitalize Electrical Design Technology Wenzhou University Wenzhou China College of Electrical and Information Engineering Hunan Institute of Engineering Xiangtan China

ISBN: (纸本)9781665448178

Due to the fractional-order characteristic of the PFC circuit, the traditional integer-order equation cannot describe the circuit model accurately. To increase the model description accuracy, the fractional-order theory is employed to describe the SiC PFC circuit model in this research, and then the model predictive control approach is applied to improve the PFC circuit's performance. The experimental results verify the feasibility of the proposed method.

关键词： Silicon carbide Photonic band gap Asia Power quality Predictive models Mathematical models Power electronics

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Bioinspired ultrathin photonic color convertors for highly efficient micro-light-emitting diodes

FlexMat

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FlexMat 2024年第3期1卷 258-268页

作者： Jiexin Li Xinrui Ding Yuzhi Shi Jiasheng Li Zihao Deng Jiayong Qiu Jinhui Zhang Wei Luo Guanwei Liang Long Zhao Yong Tang Ai Qun Liu Zongtao Li National & Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices South China University of Technology Guangzhou China Institute of Precision Optical Engineering School of Physics Science and Engineering Tongji University Shanghai China Guangdong Provincial Key Laboratory of Semiconductor Micro Display Foshan Nationstar Optoelectronics Company Ltd. Foshan China Department of Electrical and Electronic Engineering Quantum Engineering and Science The Hong Kong Polytechnic University Hong Kong China School of Fashion and Textiles The Hong Kong Polytechnic University Hong Kong China

Pixelated color convertor plays an immensely important role in next-generation display technologies. However, the inherent randomness of light propagation within the convertor presents a formidable challenge to reconcile the huge contradiction between excitation and outcoupling. Here, we demonstrate a bioinspired photonic waveguide pixelated color convertor (BPW-PCC) to realize directional excitation and outcoupling, which is inspired by an insect visual system. The lens array of BPW-PCC enables a focusing photonic waveguide that guides the excitation light and converges it on colloidal quantum dots; the directional channel provides a splitting photonic waveguide to enhance the outcoupling of photoluminescence light. Consequently, the excitation and outcoupling efficiency can be simultaneously improved at this judiciously designed pixelated color convertor with a thickness of 50 μm. By this strategy, ultrathin BPW-PCCs with 4.4-fold enhanced photoluminescence intensity have been demonstrated in micro-light-emitting diode devices and achieved a record-high luminous efficacy of 1600 lm W −1 mm −1 , opening a new avenue for efficient miniaturized displays.

关键词： bioinspired design micro-light-emitting diodes photonic waveguide pixelated color convertors

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A 6-m Tunnel Boring Machine Steel Arch Splicing Manipulator

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Chinese Journal of Mechanical engineering 2022年第1期35卷 1-14页

作者： He, Yuanfu Xia, Yimin Xu, Zhen Yao, Jie Ning, Bo Xiao, Xuemeng College of Mechanical and Electrical Engineering Central South University Changsha China State Key Laboratory of High Performance Complex Manufacturing Central South University Changsha China China Railway Construction Heavy Industry Co. Ltd. Changsha China China Railway Siyuan Survey and Design Group Co. Ltd. Wuhan China National-Local Joint Engineering Research Center of Underwater Tunnelling Technology Wuhan China

Robotic splicing of steel arches is a challenging task that is necessary to realize the grasping and docking of steel arches in a limited space. Steel arches often have a mass of more than 200 kg and length of more than 4 m. Owing to the large volume and mass of steel arches and the high requirements for accurately positioning the splicing, it is difficult for a general manipulator to meet the stiffness requirements. To enhance the structural stiffness of the steel arch splicing manipulator, a single-degree-of-freedom (DOF) closed-loop mechanism was added to the grasping structure of the manipulator. Based on the basic principle of structural synthesis, a solution model of the single-DOF closed-loop mechanism was developed, and alternative kinematic pairs of the mechanism with different input constraints and output requirements were derived. Based on this model, a design method for a single-DOF closed-loop grasping mechanism and a posture adjustment mechanism for a steel arch was devised. Combined with the same dimensional subspace equivalence principle of the graphical-type synthesis method, 12 types of steel arch splicing manipulator were constructed. By analyzing the motion/force transmission and structural complexity of the steel arch splicing manipulators, the best scheme was selected. A prototype of the steel arch splicing manipulator was manufactured. Adams software was used to obtain clearly the output trajectory of the end of the manipulator. The relative spatial positions of the upper and lower jaws under different working stages were analyzed, demonstrating that the manipulator satisfied the grasping requirements. Through a steel arch splicing experiment, the grasping effect, docking accuracy, and splicing efficiency of the manipulator met the design requirements. The steel arch splicing manipulator can replace the manual completion of the steel arch splicing operation, significantly improving the operation efficiency.

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Drift-Flux Correlation Based on Coaxial Line Phase Sensor in a Horizontal Slug Flow

SSRN

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SSRN 2022年

作者： Zhao, Zhiyue Wang, Xiaojie Wang, Fan Li, Xiaoting Fang, Lide Zhao, Ning The College of Physics Science and Technology Hebei University Baoding071002 China College of Quality and Technical Supervision Hebei University National & Local Joint Engineering Research Center of Metrology Instrument and System Hebei Key Laboratory of Energy Metering and Safety Testing Technology Baoding071002 China College of Mechanical and Electrical Engineering Cangzhou Normal University Cangzhou061001 China

Void fraction is a crucial parameter in pressure drops calculation, heat transfer industrial process design in the two-phase flow, the drift-flow correlation is often been applied in the void fraction predicted of gas-liquid two-phase due to its rate has the advantageous characteristics of simple structure and high practicality. The void fraction measurement experiments of slug flow have been conducted using a coaxial line phase sensor, and the prediction performance of available correlations has been assessed and analyzed comprehensively using current and database obtained. After the systematic analysis of the influence effecting on the distribution parameter C0 and drift velocity ugm, the functional between C0 and L-M parameter X is established, and mass quality ratio between liquid and gas (1-x)/x and superficial velocity um are selected as variables to develop prediction models for ugm. The optimized correlation can dynamically reflect the effects of gas-liquid flow velocity and system pressure variation on C0 and ugm, and the predictive performance of present correlation evaluated by the mean absolute percentage error (MAPE) is 6.98% and 11.07% in current and literature data, respectively. © 2022, The Authors. All rights reserved.

关键词： Void fraction

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Hexagonally ordered microbowl arrays decorated with ultrathin CuInS_(2) nanosheets for enhanced photoelectrochemical performance

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Journal of Energy Chemistry 2020年第12期29卷 134-142页

作者： Ming Li Le Chen Yanjie Su Huan Yin Kexiang Hu State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China School of Electronic Engineering and Automation Guilin University of Electronic TechnologyKey Laboratory of Optoelectronic Information Processing of Guangxi Colleges and Uniy/ersitiesGuilin 541004GuangxiChina Key Laboratory for Thin Film and Microfabrication of the Ministry of Education Department of Micro/Nano ElectronicsSchool of ElectronicsInformation and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China National and Local Joint Engineering Laboratory of Internet Technology on Mine School of Information and Control EngineeringChina University of Mining and TechnologyXuzhou 221008JiangsuChina School of Physics and Telecommunication Engineering Guangxi Colleges and Universities Key Lab of Complex System Optimization and Big Data ProcessingYulin Normal UniversityYulin 537400GuangxiChina

This paper demonstrates the design and fabrication of three-dimensional(3 D) hexagonally ordered microbowl arrays(MBAs) decorated with Cu In S2 nanosheets for enhanced photoelectrochemical(PEC) performance. The 3 D MBAs are fabricated by a micro-fabrication technique. The ultrathin CuInS2 nanosheets are grown on the 3 D electrodes by solvothermal transformation of Cu film. The photocurrent density of 3 D photocathode(CuInS2@MBAs) is about two times higher than that of the planar counterpart(CuInS2@Planar). The improved PEC performance can be ascribed to the elevated light trapping ability and the increased surface area for loading photocatalysts. In addition, CdS quantum dots as cocatalysts are modified onto the Cu In S2 nanosheets to further enhance the PEC activity because the formed p-n heterojunction can accelerate the separation of photogenerated carriers. As a result, the 3 D photocathode of CuInS2/CdS@MBAs shows an optimal incident photon to current efficiency of 10% at the wavelength of400 nm. It is believed that this work can be generalized to design other hierarchical 3 D photoelectrodes for improved solar water splitting.

关键词： Microbowl array CuInS_(2) Nanosheet Photocathode Photoelectrochemical performance

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A Fractional Order Model Predictive Control Method for Electric-Hydrogen Hybrid Energy Storage System

A Fractional Order Model Predictive Control Method for Elect...

引用

Chinese Automation Congress (CAC)

作者： Xiaofeng Xu Zishun Peng Li Li Wen Zhou Zhenxing Zhao Yuxing Dai National-Local Joint Engineering Laboratory For Digitalize Electrical Design Technology Wenzhou University Wenzhou China Zhejiang CHINT Electrics Co. Ltd. Yueqing China Changsha Sunye Electric Co. Ltd. Changsha China College of Electrical & Information Engineering Hunan Institute of Engineering Changsha China

ISBN: (纸本)9781665426480

A Fractional order model predictive control (FO-MPC) method for electric-hydrogen combined hybrid energy storage system is proposed in this paper. This method can help the converter of HESS to smooth the fluctuations of DG’s output better, improve the control accuracy of the converter output current and improve the stability of DC microgrid. Firstly, the structure of electric-hydrogen combined HESS is illustrated and DC microgrid system is described. Secondly, the concept of fractional calculus is introduced and the predictive model of DC Converter based on fractional order differential equation is established. According to the predictive model, the next current state of bidirectional converter of battery-ultracapacitor and converter of electrolyzer and fuel cell is predicted precisely. Finally, the fractional order model predictive control approach is experimentally verified in Buck/Boost circuit and significantly reduce the current ripple on the DC bus of the microgrid.

关键词： Hydrogen Microgrids Power smoothing Predictive models Stability analysis Regulation Voltage control

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Recent Advances in Triboelectric Nanogenerators: From Technological Progress to Commercial Applications

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ACS Nano 2023年第12期17卷 11087-11219页

作者： Choi, Dongwhi Lee, Younghoon Lin, Zong-Hong Cho, Sumin Kim, Miso Ao, Chi Kit Soh, Siowling Sohn, Changwan Jeong, Chang Kyu Lee, Jeongwan Lee, Minbaek Lee, Seungah Ryu, Jungho Parashar, Parag Cho, Yujang Ahn, Jaewan Kim, Il-Doo Jiang, Feng Lee, Pooi See Khandelwal, Gaurav Kim, Sang-Jae Kim, Hyun Soo Song, Hyun-Cheol Kim, Minje Nah, Junghyo Kim, Wook Menge, Habtamu Gebeyehu Park, Yong Tae Xu, Wei Hao, Jianhua Park, Hyosik Lee, Ju-Hyuck Lee, Dong-Min Kim, Sang-Woo Park, Ji Young Zhang, Haixia Zi, Yunlong Guo, Ru Cheng, Jia Yang, Ze Xie, Yannan Lee, Sangmin Chung, Jihoon Oh, Il-Kwon Kim, Ji-Seok Cheng, Tinghai Gao, Qi Cheng, Gang Gu, Guangqin Shim, Minseob Jung, Jeehoon Yun, Changwoo Zhang, Chi Liu, Guoxu Chen, Yufeng Kim, Suhan Chen, Xiangyu Hu, Jun Pu, Xiong Guo, Zi Hao Wang, Xudong Chen, Jun Xiao, Xiao Xie, Xing Jarin, Mourin Zhang, Hulin Lai, Ying-Chih He, Tianyiyi Kim, Hakjeong Park, Inkyu Ahn, Junseong Huynh, Nghia Dinh Yang, Ya Wang, Zhong Lin Baik, Jeong Min Choi, Dukhyun Kyung Hee University Gyeonggi Yongin17104 Korea Republic of Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Department of Mechanical Engineering Soft Robotics Research Center Seoul National University Seoul08826 Korea Republic of Department of Mechanical Engineering Gachon University Seongnam13120 Korea Republic of Department of Biomedical Engineering National Taiwan University Taipei10617 Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan School of Advanced Materials Science & Engineering Sungkyunkwan University Suwon16419 Korea Republic of Sungkyunkwan University 2066 Seobu-ro Gyeonggi Suwon16419 Korea Republic of Department of Chemical and Biomolecular Engineering National University of Singapore 4 Engineering Drive 4 117585 Singapore Division of Advanced Materials Engineering Jeonbuk National University 567 Baekje-daero Jeonbuk Jeonju54896 Korea Republic of Jeonbuk National University 567 Baekje-daero Jeonbuk Jeonju54896 Korea Republic of Department of Physics Inha University 100 Inha-ro Incheon22212 Korea Republic of School of Materials Science & Engineering Yeungnam University Gyeongbuk Gyeongsan38541 Korea Republic of 291 Daehak-ro Daejeon34141 Korea Republic of School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore Institute of Flexible Electronics Technology of Tsinghua Zhejiang Jiaxing314000 China Nanomaterials and System Lab Major of Mechatronics Engineering Faculty of Applied Energy System Jeju National University Jeju632-43 Korea Republic of School of Engineering University of Glasgow GlasgowG128QQ United Kingdom Seoul02792 Korea Republic of Department of Physics Inha University Incheon22212 Korea Republic of Suwon16419 Korea Republic of Department of

Serious climate changes and energy-related environmental problems are currently critical issues in the world. In order to reduce carbon emissions and save our environment, renewable energy harvesting technologies will serve as a key solution in the near future. Among them, triboelectric nanogenerators (TENGs), which is one of the most promising mechanical energy harvesters by means of contact electrification phenomenon, are explosively developing due to abundant wasting mechanical energy sources and a number of superior advantages in a wide availability and selection of materials, relatively simple device configurations, and low-cost processing. Significant experimental and theoretical efforts have been achieved toward understanding fundamental behaviors and a wide range of demonstrations since its report in 2012. As a result, considerable technological advancement has been exhibited and it advances the timeline of achievement in the proposed roadmap. Now, the technology has reached the stage of prototype development with verification of performance beyond the lab scale environment toward its commercialization. In this review, distinguished authors in the world worked together to summarize the state of the art in theory, materials, devices, systems, circuits, and applications in TENG fields. The great research achievements of researchers in this field around the world over the past decade are expected to play a major role in coming to fruition of unexpectedly accelerated technological advances over the next decade. © 2023 The Authors. Published by American Chemical Society

关键词： Nanogenerators

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State of charge estimation for lithium-ion battery based on dynamic data reconciliation combined with unscented Kalman filtering and long short-term memory network

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Journal of Energy Storage 2025年 124卷

作者： Yan, Jin Zhang, Zhengjiang Wang, Sigao Hong, Zhihui Zhao, Sheng Wu, Guichu The National and Local Joint Engineering Research Center of Electrical Digital Design Technology Wenzhou University Zhejiang Wenzhou325000 China The Key Laboratory of Low-Voltage Apparatus Intellectual Technology of Zhejiang Wenzhou University Zhejiang Wenzhou325000 China Zhejiang Juchuang Intelligent Technology Company Limited Zhejiang Wenzhou325000 China

For new energy vehicles, their safety and reliability are closely related to the accuracy of the state of charge (SOC) estimation of lithium batteries. However, the single SOC estimation methods have their limitations, and the accuracy of the estimation is limited. To improve the accuracy of SOC estimation, this study proposes a hybrid method based on dynamic data reconciliation (DDR) for data fusion. The method combines the Unscented Kalman Filter (UKF) based on the Thevenin model and the long short-term memory (LSTM) method, which operate in parallel to generate two sets of SOC prediction data, after which the two sets of data are fused by DDR to obtain the final SOC estimation result. The results from both the simulation and experimental set, show that the proposed method not only integrates the advantages of the two single methods, but also demonstrates high robustness and accuracy. © 2025 Elsevier Ltd

关键词： Lithium-ion batteries

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IFA-EO: An improved firefly algorithm hybridized with extremal optimization for continuous unconstrained optimization problems

Research Square

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Research Square 2021年

作者： Chen, Min-Rong Yang, Liu-Qing Zeng, Guo-Qiang Lu, Kang-Di Huang, Yi-Yuan School of Computer Science South China Normal University Guangzhou510631 China National-Local Joint Engineering Laboratory of Digitalize Electrical Design Technology Wenzhou University Wenzhou325035 China College of Cyber Security Jinan University Guangzhou510632 China Institute of Cyber Systems and Control Zhejiang University Hangzhou310018 China

As one of the evolutionary algorithms, firefly algorithm (FA) has been widely used to solve various complex optimization problems. However, FA has significant drawbacks in slow convergence rate and is easily trapped into local optimum. To tackle these defects, this paper proposes an improved FA combined with extremal optimization (EO), named IFA-EO, where three strategies are incorporated. First, to balance the tradeoff between exploration ability and exploitation ability, we adopt a new attraction model for FA operation, which combines the full attraction model and the single attraction model through the probability choice strategy. In the single attraction model, small probability accepts the worse solution to improve the diversity of the offspring. Second, the adaptive step size is proposed based on the number of iterations to dynamically adjust the attention to the exploration model or exploitation model. Third, we combine an EO algorithm with powerful ability in local-search into FA. Experiments are tested on two group popular benchmarks including complex unimodal and multimodal functions. Our experimental results demonstrate that the proposed IFA-EO algorithm can deal with various complex optimization problems and has similar or better performance than the other eight FA variants, three EO-based algorithms, and one advanced differential evolution variant in terms of accuracy and statistical results. © 2021, CC BY.

关键词： Probability

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engineering Application of a large Airborne Radar Power Supply System with 100 kW

Engineering Application of a large Airborne Radar Power Supp...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Jinsong Xia Yuetong Wang Xiaoli Zhang Tingli Cheng Zhiwei Chen Yingying Zhang School of Electrical Engineering and Automation Hefei University of Technology HeFei China National and local joint Engineering Laboratory of renewable energy access grid technology HeFei China

ISBN: (数字)9781728153018

ISBN: (纸本)9781728153025

With the development of the power electronics technology, the power supply system of radar directly affects the performance of the radar. Higher reliability and security of electronics units in the radar array brought forward stringent requirements for its power supply system. In this paper, a large airborne radar power supply system with output power of 100kW is designed and implemented by using the layered and fused power supply architecture of "centralized rectification and decentralized voltage stabilization". The output voltage, current, power consumption and temperature of the power supply system can be monitored through the network in real time to ensure that the system works in a normal state. The design of each component of the power supply system, such as the distribution unit, the rectifier unit, the DC/DC conversion unit, the capacitance module and so on, is introduced in detail. The scheme of the power supply system has good reliability, high security, and easy expansion, which offers important reference to the design of other radar power supply and distribution systems.

关键词： Power supplies Airborne radar Rectifiers Power system stability Reliability engineering Power system reliability Security

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