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IEEE Energy Conversion Congress and Exposition

作者： Xiangwen Sun Zicheng Liu Dong Jiang An Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9781728158266

ISBN: (纸本)9781728158273

Based on the control of the five-phase open-end winding induction motor (OEWIM) drive system, where the main and floating inverters are supplied by a DC power and a floating capacitor respectively, an open-phase fault-tolerant strategy is proposed by taking advantage of multiple degrees of freedom. Without extra hardware-assisted expense, the fault-tolerant strategy ensures the smooth output torque and stable floating capacitor voltage when the open-circuit fault occurs on the inverter legs or stator windings. Experimental results are presented to verify the effectiveness of the proposed fault-tolerant strategy.

关键词： Capacitors Circuit faults Inverters Voltage control Windings Topology Switches

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Real-time evaluation method for measurement error of capacitor voltage transformer

Real-time evaluation method for measurement error of capacit...

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

作者： Keqi Ma Tao Jiang Hongbin Li Zhan Meng Qing Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9781728196596

ISBN: (纸本)9781728196602

As one of the electrical parameters measuring devices, capacitor voltage transformer (CVT) is widely used in the grid with a voltage of 110kV and above. It provides reliable basis for electric energy measurement, state monitoring and relay protection, thus related to the safety, stability and economic operation of the power system. The existing measurement error evaluation methods are not conducive to timely evaluate the error of CVTs. Therefore, a real-time error evaluation method for CVTs based on same-phase voltage correlation and large-dimensional random matrices (SPVC-LDRM) is proposed. Collect same-phase voltage measurement data of CVTs, extract the error state characteristic parameters for CVTs based on the same-phase voltage correlation, and construct a large-dimensional random matrices model, then the evaluation index and its threshold are calculated to evaluate the error anomaly of CVTs in real time according to single-ring law. The simulation experiment verifies the effectiveness of the method in evaluating the measurement error of the CVTs.

关键词： Measurement errors Voltage measurement Correlation Voltage transformers Capacitors Power system stability Real-time systems

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Construcing Graphene Conductive Networks in Manganese Vanadate as High-Performance Cathode for Aqueous Zinc-Ion Batteries

SSRN

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SSRN 2022年

作者： Liu, Hongwei Wang, Nengze Hu, Lei Sun, Mengxuan Li, Zhijie Jia, Chunyang State Key Laboratory of Electronic Thin Films and Integrated Devices National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu610054 China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen518110 China School of Physics University of Electronic Science and Technology of China Chengdu610054 China

Aqueous zinc-ion batteries (AZIBs) have been widely studied for their cheapness, safety, as well as high energy and power density. Electrode material plays a dominant role in the electrochemical properties of zinc-ion batteries. Reduced graphene oxide (rGO) can easily interact with compounds via π-π stacking for high-speed electron transport. In this study, we uniformly loaded the Mn-modified V6O13 material cathode onto the rGO conductive network. It can not only releases the electron conduction process that constrains the performance of the electrode material, but also acts as a uniquely elastic medium to buffer the large volume changes brought about by the MnVO nanobelts during charging and discharging. The results show that MnVO@rGO exhibits excellent energy storage properties with a high capacity of 360.3 mAh g-1 at a current density of 0.2 A g-1 in being used as the cathode material for AZIBs. More significantly, even with a current density expansion of a factor of 100, the MnVO@rGO//Zn battery still has a capacity of 88.9 mAh g-1 and a capacity retention rate of over 100% after 10,000 long cycles. In addition, it has a high energy density of 260.0 Wh kg-1 and a high power density of 9113.7 W kg-1. This study provides an interesting idea for the development of electrode materials for zinc-ion batteries. © 2022, The Authors. All rights reserved.

关键词： Nanobelts

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Overview of the Rectangular Wire Windings AC Electrical Machine

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CES Transactions on Electrical Machines and Systems 2019年第2期3卷 160-169页

作者： Yu Zhao Dawei Li Tonghao Pei Ronghai Qu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China

The rectangular wire winding AC electrical machine has drawn extensive attention due to their high slot fill factor,good heat dissipation,strong rigidity and short end-windings,which can be potential candidates for some traction application so as to enhance torque density,improve efficiency,decrease vibration and weaken noise,*** this paper,based on the complex process craft and the electromagnetic performance,a comprehensive and systematical overview on the rectangular wire windings AC electrical machine is *** to the process craft,the different type of the rectangular wire windings,the different inserting direction of the rectangular wire windings and the insulation structure have been compared and ***,the detailed rectangular wire windings connection is researched and the general design guideline has been ***,the performance of rectangular wire windings AC machine has been presented,with emphasis on the measure of improving the bigger AC copper losses at the high speed condition due to the distinguished proximity and skin ***,the future trend of the rectangular wire windings AC electrical machine is prospected.

关键词： AC copper losses the rectangular wire winding AC electrical machine process craft winding connection.

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Inside Back Cover: Plasma Process. Polym. 2/2022

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Plasma Processes and Polymers 2022年第2期19卷

作者： Chen Lu Xingyu Chen Yuqi Wang Yu Zhu Zhenping Zou Zilan Xiong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

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A General Dead Time Compensation Method Based on Current Ripple Prediction and Pulse Delay Measurement for Voltage Source Inverter

A General Dead Time Compensation Method Based on Current Rip...

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IEEE Energy Conversion Congress and Exposition

作者： Zewei Shen Dong Jiang Jianan Chen Zicheng Liu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology

ISBN: (数字)9781728158266

ISBN: (纸本)9781728158273

This paper introduces a general dead time compensation method for voltage source inverter. By analyzing the dead time effect caused by the current freewheeling and switching delay, the precise dead time compensation can be implemented by reconstructing the actual phase current with the general current ripple prediction and pulse delay measurement. Simulation and experimental results are provided to validate the proposed method with good performance, and the proposed method can be extended to different topologies and modulation schemes.

关键词： Switches Delays Pulse width modulation Delay effects Inverters Topology Voltage measurement

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Viscous effects on nonlinear double tearing mode and plasmoid formation in adjacent Harris sheets

arXiv

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arXiv 2022年

作者： Ahmad, Nisar Zhu, Ping Shen, Chao Ali, Ahmad Zeng, Shiyong Shenzhen518055 China 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 Hubei Wuhan430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Shenzhen518055 China Pakistan Tokamak Plasma Research Institute Islamabad3329 Pakistan Department of Engineering and Applied Physics University of Science and Technology of China Anhui Hefei230026 China University of Science and Technology of China China

In this paper, we study the effects of viscosity on the evolution of double tearing mode (DTM) in a pair of adjacent Harris sheets based on the resistive MHD model in the NIMROD code. Similar to the tearing mode in the conventional single Harris sheet, a transition is observed in the generation of both normal and monster plasmoids at Pr = 1. In the Pr r is above the critical value, the generation of monster plasmoid is halted. Correspondingly, in the Pr r > 1 regime this flow advection is inhibited. © 2022, CC BY-NC-SA.

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Outside Front Cover: Plasma Process. Polym. 5/2022

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Plasma Processes and Polymers 2022年第5期19卷

作者： Chen Lu Zilan Xiong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

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Distributed control system for catalysing the formation of artificial rainfall and snow using charged particles 2

Distributed control system for catalysing the formation of a...

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2nd International Conference on Environmental Prevention and Pollution Control Technologies, EPPCT 2020

作者： Yang, Z. Wu, Q. Zhang, M. Zheng, W. Wang, Y. Ai, X. China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan Hubei430074 China 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 Wuhan Hubei430074 China

In order to solve the limitations and shortcomings of the traditional artificial rainfall technology, researchers all over the world are actively researching new artificial rainfall technologies. The charged particle catalytic artificial rainfall technology is one of the new artificial rainfall technologies. This method uses a charged particle generator set up in the wild to produce charged particles to catalyse rainfall. It is necessary to control all equipment in the experiment site remotely during the experiment. Thus, a control system needs to be implemented. There are many kinds of controlled equipment in this control system, such as high-voltage power supply, meteorological data acquisition devices, and various experimental auxiliary equipment. In this paper, we design and implement a comprehensive control system based on the characteristics of the charged particle catalysed artificial rainfall field experiment and the controlled equipment in the experiment site. The software interface connected to different types of equipment in the system is developed based on the large-scale experimental control system framework CFET, which can easily add equipment and view measurement data. The system is designed as a distributed system connected through a network, which can meet the needs of centralized control of multiple experimental sites. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Charged particles

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Automated Cardiac Vortex Ring Identification and Characterization Based on Recurrent All-Pairs Field Transforms and Lagrangian Averaged Vorticity Deviation

SSRN

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SSRN 2023年

作者： Yang, Ke Zeng, Shan Shi, Ruizheng Ghista, Dhanjoo N. Hu, Xin Lv, Site Zhang, Chris W.J. Zhang, Yi Wong, Kelvin K.L. School of Mathematics and Computer Science Wuhan Polytechnic University Wuhan430023 China Department of Cardiovascular Medicine Xiangya Hospital Central South University Changsha410008 China University 2020 Foundation San JoseCA95126 United States The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Department of Mechanical Engineering College of Engineering University of Saskatchewan SaskatoonSKS7N 5A9 Canada Machine Intelligence Laboratory College of Computer Science Sichuan University Chengdu610041 China School of Electrical and Electronic Engineering University of Adelaide AdelaideSA5005 Australia

Automated identification of cardiac vortices is a formidable task due to the complex nature of blood flow within the heart chambers. This study proposes a novel approach that algorithmically characterizes the identification criteria of these cardiac vortices based on Lagrangian Averaged Vorticity Deviation (LAVD). For this purpose, the Recurrent All-Pairs Field Transforms (RAFT) on the optical flow of Phase Contrast Magnetic Resonance Imaging (PC-MRI) is introduced to construct a continuous velocity field and reduce errors that arise from the integral process of LAVD. Additionally, Generalized Hough Transform (GHT) is applied for automated depiction of the structure of cardiac vortices. The effectiveness of this method is demonstrated and validated by the computation of the acquired cardiac flow data. The results of this comprehensive visual and analytical study show that the evolution of cardiac vortices can be effectively described and displayed, and the RAFT framework for optical flow can synthesize the in-between PC-MRIs with high accuracy. This allows cardiologists to acquire a deeper understanding of intracardiac hemodynamics and its impact on cardiac functional performance. © 2023, The Authors. All rights reserved.

关键词： Vortex flow

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