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

作者： Bing Zhu Jiahao She Yuan Liu Xulong Wang Xiaofei Li Jun Yang Kuanjun Fan State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China China Electric Power Research Institute Wuhan China

Synchrotron radiation light source has evolved into the fourth generation of diffraction-limited storage ring sources. Off-axis injection is a common approach at many leading international light sources, with the core element being Nonlinear Kicker (NLK). The pulse power supply is a critical component for ensuring the proper operation of NLK. This paper focuses on the design of pulse power supplies for NLK used in synchrotron light sources, using the off-axis injection NLK at the 1.5 GeV low-energy ring of Wuhan Light Source as a case study. The study employs Matlab/Simulink simulation to analyze the impact of various parameters on the output current of pulse power supply. The outcome of this study culminated in the design of a pulse power supply featuring a pulse current amplitude of 5440 A and a pulse width of 1 μs.

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High Order Inertia Response Analysis of Wind Power Generation Based on Power-Internal Voltage Relationship

High Order Inertia Response Analysis of Wind Power Generatio...

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IEEE Asia Power and Energy engineering Conference (APEEC)

作者： Wei He Xiaoming Yuan Yingbiao Li Ye Zhang State Key Laboratory of Advanced Electromagnetic and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Key Laboratory of HVDC China Southern Power Grid CSG Electric Power Research Institute Guangzhou China

To make the wind power generation support inertial response becomes a necessary trend for the future development of wind power. However, the inertial response of wind power generator is very different from the synchronous generator (SG), which presents high order inertia response characteristics. The reason for the high order inertia response has not been revealed yet. To deal with it, we study the response process of the wind power generator from its power-internal voltage relationship. On this basis, we introduce the concept of the gearbox to investigate the difference between the wind power generator and the SG. It is revealed that the high order characteristics of the gearbox determine the high order inertia response. Then the characteristics, causes and impact factors of the high order inertia response of wind power generation are studied and concluded. Finally the time domain simulation validates the results.

关键词： Simulation Process control Wind power generation Power system stability Generators Synchronous generators Stability analysis

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Effect of Dark Periods on Subsequent Restrike in the Discontinuous Development of Positive Leader

Effect of Dark Periods on Subsequent Restrike in the Discont...

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Power and Electrical engineering (ACPEE), 5th Asia Conference on

作者： Lei Liu Yang Liu Bing Luo Zheng Zhong Caijin Fan Tingting Wang Junjia He Lixue Chen Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Research on the physical mechanism of discontinuous development for the positive leader discharge is fundamental for optimizing the external insulation design of transmission lines. The effect of dark periods on the subsequent restrike, as a factor determining the discontinuous development feature, is investigated by means of a current measurement system with a wide dynamic range and direct optical imaging. With the increase of the voltage change rate, the duration of dark periods decreases, and the subsequent restrike is facilitated to occur and end the dark period. In addition, the discharge current and the amount of charge, representing the electrical characteristics, increase in the restrike process with the increase of these electrical parameters in the previous dark period. Two equations are suggested for fitting positive correlations of these parameters in the dark period and restrike processes.

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A Novel Variable Impedance PM Machines with Separated Fault Tolerant Ring

A Novel Variable Impedance PM Machines with Separated Fault ...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Runyu Wang Xinggang Fan Dawei Li Ronghai Qu Yongtao Peng Xiaopeng Zhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China National Key Laboratory of Science and Technology on Aircraft Control AVIC Xi’an Flight Automatic Control Research Institute Xi’an China

This paper aims to analyze and design a novel variable impedance permanent magnet (PM) machine with separated fault tolerant ring for high reliability applications. The proposed topology automatically changes from low impedance to ultra-high impedance under turn-to-turn short-circuit without complex fault diagnosis and control strategies. First, the topology of the variable impedance PM machine is introduced. Then, the magnetic field distribution of the separate fault tolerant ring under health and fault is analyzed to qualitatively reveal the fault tolerance principle. Finally, a turn-to-turn short-circuit model considering the core saturation effect is developed for investigating the mechanism of fault tolerance performance improvement. It is found that the short-circuit current and torque ripple after the fault of the variable impedance machines are significantly lower than those of the conventional ones.

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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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A Hybrid EMI Filter Design for Motor Drive System Based on Common-Mode Impedance Optimization

A Hybrid EMI Filter Design for Motor Drive System Based on C...

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Power Electronics and Application Symposium (PEAS), IEEE International

作者： Jianrui Liu Dong Jiang She Yan Pengye Wang Weiheng He Qihong Liu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China GD Midea Heating & Ventilating Equipment Co. Ltd. Advanced Research Center Foshan China

The motor drive system is a widely studied power electronics application, with significant attention given to its electromagnetic interference (EMI) issues. Passive EMI filters (PEFs), composed of inductors and capacitors, are commonly employed to mitigate EMI. However, the size and weight of conventional common mode inductors with high inductance tend to cause heating and power loss problems. An alternative solution is the implementation of active EMI filters (AEFs), which significantly reduce the inductance value of common mode inductors, resulting in a smaller filter size and improved power density and efficiency for the electric drive system. In this study, a hybrid EMI filter is designed for motor drive systems featuring certain ground parasitic common-mode (CM) capacitance. By optimizing the impedance relationship, the proposed filter effectively suppresses CM noise in the frequency range of 150 kHz to 1 MHz, achieving noise reduction of 20–30 dB.

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Magnet Design of a 5MW Liqhysmes

Magnet Design of a 5MW Liqhysmes

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Energy, Electrical and Power engineering (CEEPE), International Conference on

作者： Li Li Meng Song Zhixing Yang Li Ren Ying Xu Jiakun Fang Chuang Wang Yifeng Qiu Joint Laboratory on Power Superconducting Technology China Southern Power Grid Company Ltd Guangzhou China The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

LIQHYSMES (combination of LIQuid HYdrogen and SMES) has the advantages of superconducting magnetic energy storage and hydrogen energy storage, which can solve the power imbalance problem caused by the output fluctuation of renewable energy because of grid connection. Superconducting magnet is the core component of the system. In this paper, the 5MW LIQHYSMES magnet is taken as the research object, and the total amount of superconducting tapes used by the magnet is taken as the optimization objective. By using COMSOL software and MATLAB software, the optimal economic design scheme of the superconducting magnet was obtained by genetic algorithm.

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Analysis of Damage Behaviors of HTS Coated Conductors Under Bending Loads

Analysis of Damage Behaviors of HTS Coated Conductors Under ...

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International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD

作者： Li Li Meng Song Jiajie Wu Jingdong Li Ying Xu Li Ren Joint Laboratory on Power Superconducting Technology China Southern Power Grid Company Ltd Guangzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

To evaluate the effect of microscopic damage in superconducting conductors on the performance degradation of coils and cables during operation. This paper develops a damage model for high temperature superconducting coated conductor. First, a three-dimensional model based on composite shells was developed to calculate the stress and strain experienced under various bending curvatures. The accuracy of the simulation model's calculations was validated by numerical formulas. Then, the initiation and evolution of damage in the rare-earth barium copper oxide (REBCO) layer was analyzed, combined with experimental data on critical current (I c ) degradation under different bending curvatures, an exponential model correlating damage and I c was proposed.

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Spread Spectrum Modulation Strategy for Vienna Rectifiers to Reduce EMI and Switching Losses

Spread Spectrum Modulation Strategy for Vienna Rectifiers to...

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Power Electronics and Application Symposium (PEAS), IEEE International

作者： Hui Liu Dong Jiang Shuyu Zhang Xuan Zhao Jianan Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China College of Electrical Engineering and Control Science Nanjing Tech University Nanjing China

The utilization of constant switching frequency pulse width modulation (CSFPWM) in the Vienna rectifier leads to the generation of numerous electromagnetic interference (EMI) spikes within its frequency spectrum. A sinusoidal spread spectrum modulation method is presented in this paper. When the maximum amplitude of three-phase current increases, the switching frequency decreases. On the basis of reducing EMI, the efficiency of the system is improved by reducing the switching loss. The experimental results show that compared with CSFPWM, sinusoidal PWM (SINPWM) can reduce the conducted EMI by 15dB.

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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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