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European Conference on Power Electronics and Applications

作者： Shijie Song Han Peng Xinbo Chen Xin Hao State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) Huazhong University of Science and Technology Wuhan China Infineon Technologies China Co Ltd Shanghai China

Conventional analytical loss models based on flat Miller plateau cannot predict the turn-off loss precisely under quasi-zero turn-off loss condition, where SiC device’s channel current has dropped to zero before the completion of voltage transient. To solve this problem, this article presents the criterion of determining turn-off condition and a general analytical loss model for SiC MOSFETs turn-off loss considering no Miller Plateau. Experiments are carried out and the results verify the analysis.

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Gelation mechanisms of gel polymer electrolytes for zinc-based batteries

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Chinese Chemical Letters 2024年第5期35卷 97-116页

作者： Mengjun Sun Zhi Wang Jvhui Jiang Xiaobing Wang Chuang Yu Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and ReactionsMinistry of EducationSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007China Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control Ministry of EducationHenan Key Laboratory for Environmental Pollution ControlSchool of EnvironmentHenan Normal UniversityXinxiang 453007China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Zinc-based batteries(ZBs)have been deemed as a potential substitute for lithium-ion batteries due to its unique advantages of abundant resources,low cost and acceptable energy *** great progress in designing electrode materials has been made,the development of high-performance ZBs still remain challenges,such as the dendrite growth of zinc anode,hydrogen evolution reaction,limited electrochemical stability window,water evaporation and liquid *** polymer electrolytes(GPEs),including hydrous GPEs with low content of active water and anhydrous GPEs without the presence of water,are proposed to avoid these ***,employing GPEs is conductive to fabricate flexible devices owing to the good mechanical *** date,most of researches focus on discovering new GPEs and exploring its application on flexible or wearable *** reviews also have outlined the polymer matrixes and advances of GPEs in various battery *** this,herein,we seek to summarize the gelation mechanisms of GPEs,involving physical gel of polymer,chemical crosslinking of polymer and chemical polymerization of ***,the preparation methods are also *** addition,not only the features and central conundrum of GPEs are analyzed but also the corresponding strategies are discussed,contributing to design GPEs with ideal properties for high-performance ZBs.

关键词： Gelation mechanisms Gel polymer electrolytes Zinc-based batteries Gelation methods

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Faraday Angle Prediction Based on 1-D Cnn on the J-Text Tokamak

SSRN

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SSRN 2023年

作者： Chen, Yanqiu Gao, Li Shen, Chengshuo Chen, Zhongyong Tao, Qinlin Wang, Yuhan Lin, Weijie Zheng, Wei Yang, Zhoujun Chen, Zhipeng Pan, Yuan 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

The Faraday angle is an indispensable physical parameter to evaluate and reconstruct the current density profile which is imperative for advanced tokamak operation and physics study. The POLARIS system has been implemented on J-TEXT since 2012 for the measurement of the Faraday angle, this system occasionally encounters operational failures that result in the inability to provide measurements. So a deep learning model is trained to predict the Faraday angle when the POLARIS is unable to provide the measurement. The model is primarily based on a 1-D convolutional neural network (CNN) and is equipped with multiple convolutional paths that can accommodate various lengths of diagnostic data. The data of 100 shots were used to train the 1-D CNN model, and 30 shots were used to optimize the hyperparameters and select the model which performs best during the training process. The results on a test set of 30 shots show that the model obtains a satisfactory fitting effect. © 2023, The Authors. All rights reserved.

关键词： Neural network models

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Impact of Control Mode on Small-Signal Stability of Hybrid Cascaded UHVDC System 5

Impact of Control Mode on Small-Signal Stability of Hybrid C...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： He, Yongjie Xiang, Wang Wen, Jinyu Zhou, Jiapei Lin, Chang Zhao, Jingbo Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd. Beijing China Electric Power Research Institute of State Grid Jiangsu Electric Power Co. Ltd. Nanjing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

The hybrid cascaded UHVDC technology is especially suitable for large-capacity, long-distance and overhead line power transmission, and is one of the important technical approaches to solve the problem of large-scale renewable energy transmission over long distances. This paper establishes the small-signal model of the hybrid cascaded UHVDC system and validates the accuracy of the small-signal model by comparing the step responses obtained from the small-signal model with those from the detailed electromagnetic transient model. Based on the developed small-signal model, the impact of two different control modes of the system, the master-slave control mode and all constant DC voltage control mode, on the small-signal stability is investigated. © 2022 IEEE.

关键词： HVDC power transmission

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Phase Delay Analysis of SP-SECE for Piezoelectric Vibration Energy Harvesting and Optimization

Phase Delay Analysis of SP-SECE for Piezoelectric Vibration ...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Xinyue Lv Han Peng Junhao Lei Yidong Zhao Yuyao Yan China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan China School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

Synchronous charge extraction (SECE) have been a hot topic in piezoelectric energy harvesting. Some scholars have been using discrete electronic components to realize self-powered SECE. However, the SP-SECE has an obvious delay, which has a side effect on piezoelectric energy harvesting. In this paper, the delay of the SP-SECE circuit is specifically modeled. The influence of envelope detector and different piezoelectric patch parameters on delay is newly considered. The results of the analysis can provide more detailed guidelines for circuit design.

关键词： Vibrations Switches Capacitance Power electronics Delays Energy harvesting Integrated circuit modeling

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A Positive and Negative-Sequence Equivalent Circuit Model for Linear Induction Machine Adapted to Urban Rail Transit

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IEEE Transactions on Transportation Electrification 2025年

作者： Guo, Yingcong Xu, Wei Ge, Jian Shangguan, Yongdao Xiao, Han Tang, Yirong Southwest Jiaotong University School of Electrical Engineering Chengdu610031 China Beijing100190 China University of Chinese Academy of Sciences School of Electronic Electrical and Communication Engineering Beijing101408 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

The equivalent circuit model is a crucial tool for estimating the performance of linear induction machines (LIMs), and it is widely used in design, optimization, etc. However, the conventional model which does not account for the asymmetrical current is not as precise in certain scenarios. Such asymmetrical current is caused by the inherent end effect in LIMs, which persists even when the machine is powered by a symmetrical voltage source. In this paper, a novel equivalent circuit model is proposed to enhance the precision of analyzing LIMs performance under asymmetrical current. Firstly, the relationship between current, back electro-motive force (EMF) and voltage is established by analyzing the positive and negative-sequence airgap magnetic field. Secondly, the excitation source is converted from symmetrical phase voltage to positive and negative-sequence current by solving the circuit constraint equation. Finally, a positive and negative-sequence equivalent circuit model is constructed and the LIM performance is further analyzed. The proposed model is thoroughly validated through comparison with other methods and experimental data. © 2015 IEEE.

关键词： Urban transportation

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Physical design of a new set of high poloidal mode number coils in the EAST tokamak

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Plasma Science and technology 2022年第3期24卷 106-113页

作者： Liang LIAO Yunfeng LIANG Shaocheng LIU Huaxiang ZHANG Xiang JI Youwen SUN Wenyin WEI Huihui WANG Jinping QIAN Liang WANG Manni JIA Long ZENG Xiang GAO the EAST Team Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich D-52425Germany 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

An external resonant magnetic perturbation(RMP)field,which is an effective method to mitigate or suppress the edge localized mode(ELM),has been planned to be applied on the ELM control issue in ITER.A new set of magnetic perturbation coils,named as high m coils,has been developed for the EAST *** magnetic perturbation field of the high m coils is localized in the midplane of the low field side,with the spectral characteristic of high m and wide n,where m and n are the poloidal and toroidal mode numbers,*** high m coils generate a strong localized perturbation *** magnetic topology under the application of high m coils should have either a small or no stochastic *** the combination of the high m coils and the current RMP coils in the EAST,flexible working scenarios of the magnetic perturbation field are available,which is beneficial for ELM control exploration on *** simulations have been carried out to characterize the high m coil system,including the magnetic spectrum and magnetic topology,which shows a great flexibility of magnetic perturbation variation as a tool to investigate the interaction between ELM and external magnetic perturbation.

关键词： resonant magnetic perturbation ELM control tokamak

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A Lightweight Self-Powered Module Based on Magnetic Energy Harvesting for Transmission Line Remotely Sensing

A Lightweight Self-Powered Module Based on Magnetic Energy H...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Yidong Zhao Han Peng Hongfei Xiao Liwen Hou Yuyao Yan Weiming Chen Chao Li State Key Laboratory of Advanced Electromagnetic Technology (AET) School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Grid Fujian Electric Power Research Institute Fuzhou China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

Transmission line condition monitoring is very important for the safe and reliable operation of the power grid, in which wireless sensors play an important role. Power supply is one of the main challenges in deploying wireless sensors. In this paper, a lightweight self-powered module with flexible installation and a wide range of application scenarios is proposed for wireless sensors power supply in transmission line condition monitoring. The magnetic energy harvester model for lightweight magnetic core is analyzed to predict the output power and voltage. The key design parameters are also analyzed to locate the most critical ones that determining the output power and power density of MEH. A self-powered module with power management circuit, as well as temperature sensor and 4G communication is constructed and tested. The proposed self-powered module can generate 30mW power under 115Arms transmission line. The overall weight is only 100 g.

关键词： Temperature sensors Wireless communication Condition monitoring Wireless sensor networks Power transmission lines Magnetic cores Magnetomechanical effects

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Simpson's Rule Differential Protection for New Energy Power Plant Outgoing Line 7

Simpson's Rule Differential Protection for New Energy Power ...

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7th Asia Conference on Power and Electrical engineering, ACPEE 2022

作者： Luo, Bing Chen, Wei Li, Shilong Xiao, Fan Liu, Dan Cao, Yuhan Wen, Minghao Huazhong University of Science and Technology China-EU Institute for Clean and Renewable Energy Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China State Grid Sichuan Electric Power Research Institute Chengdu China

ISBN: (纸本)9781665418195

New energy power supplies are connected to the grid through converters, and the fault features of short-circuit currents include small current amplitudes, power frequency variations, and phase limitations, which may reduce sensitivity of traditional differential protection, and even cause uncorrected operation. This phenomenon is particularly prominent in new energy power plants outgoing lines. Therefore, this article firstly discussed the fault feature of new energy sources. Then a theory of current differential protection based on Simpson's Rule integration is put forward, which can reliably identify the internal or external faults. Finally, build the relevant simulation model to prove the performance of Simpson's Rule differential protection scheme for new energy power plant outgoing line. The simulation results have suggested that the protection scheme fully satisfies the demands of safe operation of energy power plant. © 2022 IEEE.

关键词： Sensitivity analysis

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An Online Accuracy Evaluation Method for Calibration Devices Based on Spatial Correlation

SSRN

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SSRN 2023年

作者： Qu, Zemin Jiao, Yang Li, Hongbin Chen, Qing Zhu, Yongzheng Wei, Wei School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Wuhan430070 China

As the testing device for smart electricity meters, a calibration device should be ensured to have qualified metering performance. The conventional inspection could only be conducted periodically, usually once a quarter, making the deterioration between two inspections neglected. Thus, studies have been made on the online inspection. Most of them are developed only for functional failures but not performance deterioration, while several theoretically feasible methods rely on too large data volumes and varieties to be practically applied. In this paper, an accuracy evaluation method is proposed based on the idea that the difference in two calibration devices' metering performance could be reflected through the correlation of time series formed by their testing results. Also, the superiority in data volumes and varieties is demonstrated, and the validity is verified with an application. © 2023, The Authors. All rights reserved.

关键词： Calibration

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