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

作者： Hongyu Zhou Wei Yao Qihang Zong Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

Grid-connected wind turbines for frequency support of the grid is conducive to improving the grid frequency security level. Grid-following (GFL) converters and gridforming (GFM) converters are two important types of equipment to support renewable energy integration into the grid. Both GFM and GFL have a variety of different control strategies when performing frequency support. Clarifying the relationship be-tween different strategies of GFM and GFL when performing frequency support will provide guidance for renewable energy frequency support. In this paper, four levels of frequency support uniformity are first established at the generation unit level. (1) The governor and damping branch of the virtual synchronous generator (VSG) control based GFM converter are unified. (2) The VSG based GFM and the droop based GFM are unified. (3) Integrated inertial control based GFL and droop based GFL are unified. Finally, the theoretical analysis is synthetically verified by MATLAB/Simulink simulation platform.

关键词： Damping Renewable energy sources Grid following Frequency conversion Synchronous generators Wind turbines Security MATLAB Frequency control Grid forming

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The inﬂuence of weak transverse magnetic ﬁeld on plasma dissipation process in the post-arc phase in a vacuum interrupter

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Plasma Science and technology 2022年第5期24卷 216-225页

作者： Qilin SHI Hao WU Zhao YUAN Zhe TAO Guixia LI Wei LUO Wei JIANG State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China Key Laboratory of Pulsed Power Technology Huazhong University of Science and TechnologyMinistry of EducationWuhan 430074People’s Republic of China School of Physics Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Transverse magnetic field(TMF)contacts and applying external TMF are often adopted for reducing the ablation of the contact surface,but TMF will also affect the breaking performance of the vacuum *** this work,we investigated the influence of weak TMF on the expansion of the plasma in the post-arc phase with one-dimensional implicit particle-in-cell/Monte Carlo collision model,and we added an external circuit to the model to ensure the correctness of the calculation *** simulated multiple magnetic field strengths(<30 mT),compared the plasma expansion process with the TMF strengths of 0 mT and 10 mT,and discussed the influence of metal vapor density on the insulation performance recovery of the vacuum *** the results,applying TMF with strength below 5 mT has little effect on the expansion of the plasma,and the TMF can increase the plasma density which improve the flow capacity of vacuum circuit breakers when the magnetic field above 10 mT,which is because the particles become more difficult to leave the discharge area under the force of the magnetic *** general,we find that weak external TMF may adversely affect the breaking performance of the vacuum circuit breakers.

关键词： vacuum circuit breakers particle-in-cell/Monte Carlo collisions transverse magnetic field plasma

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Research on Decoupling of Units in Distribution Networks

Research on Decoupling of Units in Distribution Networks

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Xuhua Liu Weiguo Zhang Xiaojie Shi Lei Lin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

The intricate interactions between substantial line impedance and diverse integration techniques have resulted in a strong coupling among PV inverters, imposing a significant challenge to achieve the independent and efficient voltage/power regulation for PV units. To tackle the challenges, this paper presents a novel approach to decouple distributed PV units connected to a distribution network via different interconnection methods. Firstly, an equivalent line impedance derivation method is proposed to streamline the complex coupled distribution network into a unified "PV unit - line impedance – grid" structure while preserving the node information. Then, a "Line Impedance Equivalent Coefficient (LEC)" is defined to capture the evolving characteristics of the equivalent line impedance. Moreover, by treating the chain structure as a special radial form, the proposed method handles diverse network structures with a minimal computational complexity. Simulation results from Matlab/Simulink demonstrate the effectiveness of this method in decoupling radial, chain and hybrid networks.

关键词： Couplings Simulation Distribution networks Regulation Inverters Hybrid power systems Impedance

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Design and Optimization of High-current Beam and Long-range Electron Gun for 1 MeV Electron Irradiation Accelerator 3

Design and Optimization of High-current Beam and Long-range ...

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

作者： Zhou, Zijian Zhang, Zhenyi Huang, Jiang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

In this paper, a high-current beam and long-range electron gun is designed and optimized for electron irradiation accelerator based on the weak-beam current problem encountered in the actual electron accelerator irradiation industry. The effects of the cathode-anode gap and two openings of the focusing electrode in the electron gun on the perveance and beam waist are investigated separately by finite element analysis of CST software to determine the optimal structural parameters. The effects of common cathode filament shapes on the shape of the electron beam spot are modeled and simulated to determine the causes of the common irregular beam profile plot generation for the first time, and a new filament shape was designed to correct the beam profile plot and improve the quality of the electron beam spot. This work could fundamentally solve the problem of nonuniformity irradiation in the irradiation industry. © 2022 IEEE.

关键词： Structural optimization

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3D-Printed Superhydrophobic and Magnetic Device That Can Self-Powered Sense A Tiny Droplet Impact

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engineering 2022年第8期8卷 196-205页

作者： Xuan Zhang Qi Wang Ruiping Zou Bo Song Chunze Yan Yusheng Shi Bin Su State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China ARC Research Hub for Computational Particle Technology Department of Chemical EngineeringMonash UniversityClayton VIC 3800Australia

Three-dimensional(3D)-printed magnetic soft architectures have attracted extensive attention and research from the engineering and material *** force-driven shape deformation of such architectures causes a change in the magnetic field distribution,indicating the capability to convert mechanical energy to ***,we fabricate a flexible superhydrophobic and magnetic device by integrating two kinds of 3D printing *** 3D-printed magnetic device(3DMD)exhibits a long-term stable mechanoelectrical conversion capacity under consecutive water droplet *** output current of the 3DMD is higher than that of records in the existing *** with Maxwell numerical simulation,the mechanoelectrical conversion mechanism of the 3DMD is investigated,further guiding regulation of the diverse ***,three 3DMDs are integrated to light up a commercial light-emitting diode(LED)by a stream of collected *** a combined design incorporating energy conversion is believed to promisingly motive advances in the 3D printing field.

关键词： 3D printing Self-powered sensing Magnetic Waterdrops

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Second Order Generalized Integrator Filtering For Enhanced Sliding Mode Observer with Fuzzy Logic Switching Function

Second Order Generalized Integrator Filtering For Enhanced S...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Kunsheng Cai Shuanghong Wang Zixin Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Sciecnce and Technology Wuhan China

ISBN: (数字)9784886864406

ISBN: (纸本)9798350379105

Traditional Sliding Mode Observers (SMO) in sensorless control of Permanent Magnet Synchronous Motors (PMSM) encounter issues such as chattering and phase delay, resulting in significant discrepancies between the estimated and actual rotor speed and position. Therefore, this paper proposes an improved SMO based on a Fuzzy Logic Controller (FLC) and an Open-Loop Frequency Estimation-based Second-Order Generalized Integrator Frequency Adaptive Filter (OLFE-SOGI) structure. The FLC implements an SMO with a selfadjusting shape factor for the sigmoid function. This strategy accelerates the convergence speed of the SMO while reducing chattering caused by the boundary layer thickness. Additionally, to mitigate the adverse effects brought by lowpass filters (LPF), the OLFE-SOGI is employed to accurately extract the back electromotive force (back-EMF) without phase delay and effectively eliminate high-order harmonic components. Simulation results verify the effectiveness and accuracy of the proposed strategy.

关键词： Fuzzy logic Filtering Simulation Force Adaptive filters Sensorless control Observers Permanent magnet motors Frequency estimation Frequency control

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Disordered Rocksalts with Lattice Oxygen Activation as Efficient Oxygen Evolution Electrocatalysts

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Transactions of Tianjin University 2023年第4期29卷 304-312页

作者： Zhengli Huan Haipeng Fu Xuerong Zheng Huiming Ji School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjin 300072China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China

The lattice oxygen oxidation mechanism(LOM)provides an efficient pathway for accelerating the oxygen evolution reaction(OER)in certain electrocatalysts by activating and involving lattice oxygen in the catalytic OER *** investigated the potential of disordered rocksalts as catalysts for accelerating the OER through the LOM process,leveraging their unique metastable Li-O-Li bond *** calculations were employed to predict the catalytic pathways and activities of disordered rocksalts(DRX),such as Li_(1.2)Co_(0.4)Ti_(0.5)O_(2)(LCTO).The results revealed that benefiting from the unhybridized Li-O electronic orbitals and the resulting metastable states of Li-O-Li bonds in DRX,LCTO exhibited a typical LOM pathway,and the lattice oxygen was easily activated and participated in the *** experimental results showed that LCTO exhibited a remarkable pH-dependent OER activity through the LOM pathway,with an overpotential of 241 mV at a current density of 10 mA/cm^(2),and excellent long-term *** work provides a novel chemical space for designing highly active and stable OER electrocatalysts by leveraging the LOM reaction pathway.

关键词： Lattice oxygen oxidation Disordered rocksalts Oxygen evolution reaction Electrocatalysts

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Research on Rotor Strength and Critical Speed of the Air-Core Pulsed Alternator

Research on Rotor Strength and Critical Speed of the Air-Cor...

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Pulsed Power Conference, International Conference on High-Power Particle Beams and International Symposium on electromagnetic Launch technology (EAPPC/BEAMS/EML), Euro-Asian

作者： Jijian Wan Kexun Yu Jiasong Wang Xianfei Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9789038661353

ISBN: (纸本)9798350352733

The Air-Core Pulsed Alternator (APA) is the preferred power supply for electromagnetic launch systems [1]. However, due to the enormous centrifugal force and the electromagnetic impact torque, extremely high demands are placed on the strength of the rotor structure. In addition, the design speed of APA is usually high, requiring the machine to pass through the first-order critical speed rapidly to avoid the occurrence of resonance. This paper investigated the structural strength and critical speed of the rotor, as these are two of the most common issues considered in the structural design of the rotor of APA, and discussed the design of the main dimensions of the rotor on this basis.

关键词： Particle beams Torque Power supplies Force Rotors Resonance Alternators Indexes electromagnetics Stress

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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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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Yao, Kexin Ye, Caiyong Liu, Yi Yang, Mohan Zhao, Yunfeng School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China School of Electrical and Information Engineering Tianjin University Tianjin300072 China National Center for Quality Inspection and Test of Motors Jingxian242500 China

ISBN: (纸本)9798331530174

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. © 2024 IEEE.

关键词： Flywheels

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NVH Analysis of Integrated Motor and Two-Speed Gearbox System for Electric Vehicles

NVH Analysis of Integrated Motor and Two-Speed Gearbox Syste...

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2022 International Conference on Electrical Machines, ICEM 2022

作者： Feng, Shun Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Hubei Wuhan430074 China

ISBN: (数字)9781665414326

ISBN: (纸本)9781665414326

The market penetration rate of electric vehicles has boosted very rapidly in China and worldwide this year. Most of e-powertrain systems nowadays in passengers' vehicle consists of electric traction motor, inverter and single speed gearbox. Compared to the traditional single speed system, integrated motor and two-speed gearbox system has been developed with higher overall efficiency, higher power density and better noise, vibration and harshness (NVH) performance. This paper presents NVH analysis and optimization of the two-speed e-powertrain system under electromagnetic and mechanical excitations. The simulation model with both e-motor and gear excitations is established. The order interference analysis is conducted at the very beginning to avoid system resonance. Modal, vibration and radiated noise analysis are done in a systematic way to analyze and optimize the original design. System NVH tests are completed in the semi-anechoic chamber. A-weighed system sound pressure level is verified to be less than 80 dBA. © 2022 IEEE.

关键词： Vibration analysis

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