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International Conference on Electrical Machines and Systems (ICEMS)

作者： Cong Zhao Zixin Li Farui Zhang Fanqiang Gao Fei Xu Hang Zhang Key Laboratory of High Density Electromagnetic Power and Systems (Chinese Academy of Sciences) Institute of Electrical Engineering Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Beijing China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan Shandong China

ISBN: (数字)9784886864406

ISBN: (纸本)9798350379105

To reduce capacity of converters, segmented power supply method is usually adopted for linear motors (LMs), and thyristor-based switches, which is composed of anti-parallel thyristors, are used to achieve power supply switching. However, thyristor-based switches can only be turned off at the moment of current zero crossing point, which may lead to overcurrent of LMs during power supply switching process. The operating characteristics of the LM is analyzed for the duration of the power supply switching, and the switching time is also derived. On this basis, a smooth power supply switching method is proposed in this paper. The proposed method can achieve thyristor-based switches of all phases turning off simultaneously, while also avoiding overcurrent. The effectiveness of the proposed method is verified by simulation results.

关键词： Time-frequency analysis Thyristors Power supplies Simulation Process control Switches Motors Turning Voltage control Switching circuits

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Model Predictive Thrust Control for Linear Induction Machine: A Fuzzy Optimization Approach

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IEEE Transactions on Industry Applications 2022年第2期59卷 1-14页

作者： Tang L. Xu W. Tang Y. Ge J. Yang K. Islam M.R. Li W. Su S. School of Management School of Electrical Engineering Xi&#x0027 State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan Hubei China School of Electrical Computer and Telecommunications Engineering University of Wollongong NSW Australia Xiangyang CRRC Motor Technology Co. Ltd. Xiangyang China CRRC Zhuzhou Motor Co. Ltd. Zhuzhou China

Model predictive thrust control (MPTC) is one of the most effective approaches for linear induction machine (LIM) drive system. It can achieve the optimization of multiple objectives with suitable weighting factors, such as low ripples and fast dynamic performance. Due to the longitudinal end effect, the selection of weighting factor becomes particularly important in LIM. However, the process of tuning the weighting factors in the objective function is very long and tedious. In this paper, a dynamic fuzzy MPTC approach is proposed to solve the multi-objective problem for minimizing the flux and thrust ripples. Based on the fuzzy optimization technique, the tuning process of weighting factors can be transformed into a discrete membership function. A “max-min” objective function of voltage vectors is employed to select a more balanced switch combination on the Pareto optimal-frontier for LIM. Furthermore, this approach can adapt to different operating conditions by adjusting objective priority of membership function. At last, comprehensive simulation and experimental results are conducted to demonstrate the effectiveness and feasibility of the proposed method. IEEE

关键词： fuzzy optimization Linear induction machine (LIM) model predictive thrust control (MPTC) optimization methods weighting factors

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Robinson Instability of a Double-bunch System 3

Robinson Instability of a Double-bunch System

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Fan, Ziyu Wang, Jian Lei, Jian Luo, Zhengqiu Yuan, Yi Hu, Chen Li, Xiaofei Fan, Kuanjun State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Grid Jiangxi Electric Power Co. Ltd Nanchang330096 China China Electric Power Research Institute Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

Robinson instability is a common beam instability that is caused by the wakefield excited in the resonant cavity. It will cause the energy spread to increase and deteriorate the beam quality, so it is essential to understand its mechanism and suppress it. Based on the bunch longitudinal motion equation, this paper analyzes two bunches with different particle numbers and synchrotron oscillation frequencies and extends the existing single-bunch Robinson instability theory to the double-bunch system. The particle motion is simulated by software MATLAB, and the simulation results are consistent with the theoretical formulas. This research puts forward specific parameter requirements for the design of the storage ring resonator cavity in the fourth-generation synchrotron radiation light source and gives a strategy to suppress beam instability, which provides a reference for subsequent engineering construction. © 2022 IEEE.

关键词： Cavity resonators

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Loss and Vibration Analysis of Flywheel Energy Storage Motor for UPS System

Loss and Vibration Analysis of Flywheel Energy Storage Motor...

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

作者： Kexin Yao Caiyong Ye Yi Liu Mohan Yang Yunfeng Zhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China School of Electrical and Information Engineering Tianjin University Tianjin China National Center for Quality Inspection and Test of Motors Jingxian China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

When the flywheel energy storage motor for UPS system is running at high speed through standby, its motor loss and electromagnetic vibration will increase. In order to improve system reliability, the motor structure needs to be reasonably designed. This paper firstly analyses the working state of flywheel energy storage motor for UPS system. Secondly, the theoretical basis of loss calculation and electromagnetic vibration is summarized in detail. In addition, the influence of structural parameters such as air gap length on stator iron loss and the influence of structural parameters such as stator slot opening on electromagnetic vibration are analyzed respectively. Through the comprehensive analysis of loss and vibration, this flywheel energy storage motor can achieve the performance requirements of low loss and low vibration.

关键词： Vibrations Stators Motors Iron Flywheels Structural engineering Magnetic losses Reliability electromagnetics Uninterruptible power systems

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Frequency multiplication with toroidal mode number of kink/fishbone modes on a static HL-2A-like tokamak

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Plasma Science and technology 2022年第12期24卷 56-66页

作者： Zhihui ZOU Ping ZHU Charlson C KIM Wei DENG Xianqu WANG Yawei HOU CAS Key Laboratory of Geospace Environment and Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026People'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 Engineering Physics University of Wisconsin-MadisonMadisonWisconsin 53706United States of America SLS2 Consulting San DiegoCalifornia 92107United States of America Southwestern Institute of Physics Chengdu 610041People's Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China School of Mathematics and Physics Anhui Jianzhu UniversityHefei 230601People's Republic of China

In the presence of energetic particles(EPs),the long-lived mode(LLM) frequency multiplication with n=1,2,3,or higher is often observed on HL-2A,where n is the toroidal mode *** kinetic-MHD model simulations of the energetic particle(EP) driven kink/fishbone modes on a static HL-2A-like tokamak using NIMROD code find that when the background plasma pressure is relatively high,and the EP pressure and the beam energy are relatively low,the mode frequency increases almost linearly with EP pressure,and the frequency is proportional to n(’frequency multiplication’),even in the absence of any equilibrium plasma *** addition,the frequency multiplication persists as the safety factor at the magnetic axis q_(0)*** the absence of EPs,the growth rate of the 1/1 mode is the largest;however,as the EP pressure increases,the growth rate of 2/2 modes or 3/3 modes becomes dominant,suggesting that higher-n modes are more vulnerable to *** results may shed light on the understanding of the toroidal mode number dependence of kink/fishbone modes in the advanced scenarios of tokamaks with weak or reversed central magnetic shear.

关键词： internal kink mode fishbone mode long-lived mode(LLM) energetic particles(EPs) HL-2A NIMROD

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Full-Order Terminal Sliding Mode Control of Surface-Mounted Pmsm System with Mismatched Uncertainties

SSRN

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SSRN 2023年

作者： Zhou, Minghao Wei, Kemeng Cai, William Xu, Wei Ge, Jian Cheng, Siwei School of Electrical and Electronic Engineering Harbin University of Science and Technology Harbin150080 China The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

This article proposes a new full-order terminal sliding mode control algorithm for speed regulation issue of surface-mounted permanent magnet synchronous motor (SPMSM) control system. To deal with the mismatched uncertainties in the second-order nonlinear system of the SPMSMs, a virtual control technique is constructed with the full-order terminal sliding mode control to ensure that the tracking error trajectory can converge to equilibrium in finite time. Owing to the integral control law, the output signals of the controllers are smoothed with the chattering phenomenon attenuated and the gain-margin overestimation avoided. Comprehensive simulation and experimental results have been carried out to demonstrate the superiority of the proposed method for improving tracking accuracy, rapidness, and robustness to the matched and mismatched uncertainties. © 2023, The Authors. All rights reserved.

关键词： Sliding mode control

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Research on Topology and Control Strategy of DR-MMC Cascaded Hybrid HVDC Transmission System for Offshore Wind Power

Research on Topology and Control Strategy of DR-MMC Cascaded...

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International Conference on Power System technology (POWERCON)

作者： Shimin Di Wang Xiang Yinliang Xu Peiyu Meng Haobo Zhang Jinyu Wen Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Establishing a new type of power system with new energy as the mainstay, offshore wind power needs to be greatly flourished. Based on the research background of 2 GW offshore wind power grid connection, the DR-MMC hybrid cascade system is firstly proposed in this paper. Based on reactive power requirements, the feasible operating range of MMC under different capacities was solved. Therefore, the system parameters were optimized. Then designed the corresponding start-up, steady-state and reactive power coordination control strategies for the system. Finally, the electromagnetic transient simulation model of DR-MMC cascaded hybrid HVDC transmission system is built in PSCAD/EMTDC, and the simulation verified the feasibility of the proposed system topology and the effectiveness of the control strategy.

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A Composite Current-Fed LLC Resonant Converter for Wide Input Voltage

A Composite Current-Fed LLC Resonant Converter for Wide Inpu...

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Smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Caifeng Liu Shuang Liu Donghai Zhu Xu Yan Xudong Zou State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan China

The LLC resonant converter is the most commonly used unidirectional isolated DC/DC converter. However, the gain adjustment range of conventional LLC resonant converters is limited and not suitable for applications with wide input voltage. In this paper, a C-LLC resonant converter topology suitable for wide input voltage range is obtained by improving the current-fed LLC resonant converter. The operational modes and stages of the C-LLC resonant converter employing the basic pulse width modulated + double phase shift modulation (PWM+DPS) are analyzed. Then an optimized modulation strategy for efficiency improvement is proposed by optimizing the soft switching range and current RMS values. Finally, a prototype is built to verify the analysis. The efficiency is improved by up to 5% when the optimized modulation strategy is adopted compared to the conventional LLC resonant conversion at voltage mismatch condition.

关键词： Phase modulation Energy Soft switching Prototypes Resonant converters Voltage Switches

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Reflectionless spatial beam benders with arbitrary bending angle by introducing optic-null medium into transformation optics

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Chinese Physics B 2021年第3期30卷 242-247页

作者： Fei Sun Yi-Chao Liu Yi-Biao Yang Hong-Ming Fei Zhi-Hui Chen Sai-Ling He Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceCollege of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China National Engineering Research Center for Optical Instruments Center for Optical and Electromagnetic ResearchZhejiang UniversityHangzhou 310058China

By introducing an optic-null medium into the finite embedded transformation,a reflectionless spatial beam bender is designed,which can steer the output beam by a fixed pre-designed angleβfor an arbitrary incident *** bending angleβof the beam bender is determined by the geometrical angle of the device,which can be changed by simply choosing different geometrical *** various bending angles,the designed spatial beam bender can be realized by the same materials(i.e.,an optic-null medium),which is a homogenous anisotropic *** simulations verify the reflectionless bending effect and rotated imaging ability of the proposed beam bender.A reduction model of the optic-null medium is studied,which can also be used for a reflectionless spatial beam bender with a pre-designed bending angle.

关键词： spatial beam benders optic-null medium transformation optics

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Optimal Model of Hydrogen Production Coupled Sewage Treatment from Renewable Energy for Hydrogen and Oxygen Utilization

Optimal Model of Hydrogen Production Coupled Sewage Treatmen...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Sihang Qi Kewei Hu Zhan Wang Ruodong Ma Yu Zhang Binyu Xiong School of Automation Wuhan University of Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Grid-Hubei-Electric Power Research Institute Wuhan China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

To avoid the waste of oxygen, a byproduct of hydrogen production from electricity, this article proposes a new utilization scenario that combines renewable energy hydrogen production with sewage treatment, and supplies pure oxygen from hydrogen production to the aerobic aeration tank for sewage treatment. This scenario involves combining pure oxygen with air, achieving the optimal pure oxygen ratio through adjustment, and then being aerated by an aerator into an aerobic bioreactor. While achieving comprehensive utilization of hydrogen and oxygen, it greatly enhances the economy of renewable energy hydrogen production. A new application scenario for renewable energy hydrogen production is provided, and simulation results show that its daily operating cost is reduced by 67.5%. The energy consumption of the aerator is reduced by 28.5%, and the light rejection rate is reduced by 30%.

关键词： Renewable energy sources Energy consumption Costs Power demand Oxygen Electricity Hydrogen

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