检索结果-内蒙古大学图书馆

International Conference on Electrical Machines and Systems (ICEMS)

作者： Yu Xiao Yang Xiao Yiming Ma Ruichi Wang Jin Wang Libing Zhou State Key Laboratory of Advanced Electromagnetic Engineering and Technology (School of Electrical and Electronic Engineering) Huazhong University of Science and Technology Wuhan China CSG PGC Energy Storage Research Institute Guangzhou China The Wolfson School of Mechanical Electrical and Manufacturing Engineering Loughborough University Loughborough UK

In this paper, the surface-mounted permanent magnet (SPM) and interior permanent magnet (IPM) machines are designed and compared for low voltage regulation applications. The principles of low voltage regulation designs in SPM and IPM machines are explained. Then, a SPM machine using halbach-array PMs and an IPM machine with U+V rotor topology are designed and optimized using the same stator and air-gap length to achieve similar rated voltage and power and voltage regulation rate. The performance between optimized SPM and IPM machines are analyzed and compared by using finite element (FE) analysis. It is found that the SPM machine can achieve higher torque density with smaller PM usage, while the IPM design can significantly improve efficiency by reducing PM loss and can ease manufacturing complexity and cost in particular for halbach-array PMs.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A Predictive Regression Model for High Frequency Structures in MTSS

A Predictive Regression Model for High Frequency Structures ...

引用

International Conference on Vacuum Electronics

作者： Zheng Tan Wanli Shi Junyi Lv Haiying Yuan Yufan Yang Shilong Zhu Luanfeng Gao Xiaofang Zhu Yulu Hu Bin Li National Key Laboratory of Science and Technology on Vacuum Electronics Key Laboratory of Large-Scale Electromagnetic Industrial Software Ministry of Education School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu P.R.China Shenzhen Institute for Advanced Study UESTC Shenzhen P.R. China

ISBN: (数字)9798350348705

ISBN: (纸本)9798350348712

In this paper, a predictive regression model for high frequency structure of helix traveling wave tubes is proposed and integrated in MTSS. In the predictive regression model, a double interpolation model is programmed to calculate the characteristics for high frequency structures with certain helix pitch and helix inner radius. XGBoost is trained to establish the forward mapping relationship between the helix pitch, the helix inner radius and the high frequency characteristic parameters. With the predictive regression model, the phase velocity, the coupling impedance and the attenuation constant of helical slow wave structure with changing helix pitch and helix inner radius can be predicted quickly and accurately.

关键词： Couplings Interpolation Traveling wave tubes Predictive models Attenuation High frequency Impedance Vacuum electronics Electron sources Optimization

来源：评论

学校读者我要写书评

暂无评论

Study on Performance Modification of Insulation Wraps for Power Transmission Line Corona Noise Prevention

Study on Performance Modification of Insulation Wraps for Po...

引用

2021 International Conference on Intelligent Computing, Automation and Systems, ICICAS 2021

作者： Yiyi, Liu Wei, Chen Dan, Lu Junjie, Wu Wei, Qi State Grid Hunan Electric Power Corporation Research Institute State Grid Laboratory of Electric Equipment Noise and Vibration Research Changsha China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781665428101

Study and prevention of transmission line corona noise has become an important means to effectively promote the environmental friendliness and energy saving of transmission line. Studies have shown that using hydrophilic coating treatment on the conductor surface, so that under the condition of precipitation, the rainwater can be evenly distributed on the conductor surface to reduce the formation density of water droplets, which can weaken the impact of raindrops on the curvature radius of the conductor. As a result, less distorted electric field and soft noise were produced, leading to reduce corona noise ultimately. The greater hydrophilicity of the conductor surface, the more significant the reduction of corona noise is. In this paper, experiments have validated that the modification of nano aluminum oxide by electron beam radiation graft technology can improve its surface reactivity, promote its dispersion and bonding ability in RTV rubber matrix, and then elevate the hydrophobicity, mechanical properties and aging resistance of modified RTV silicone rubber. In addition, specific properties of thermal conductivity and hydrophobicity can be improved by further adding functional monomers. © 2021 IEEE.

关键词： Electric lines

来源：评论

学校读者我要写书评

暂无评论

Design and Simulation of Input Cavity of W-Band Extended Interaction Klystron

Design and Simulation of Input Cavity of W-Band Extended Int...

引用

International Conference on Vacuum Electronics

作者： Wanli Shi Zheng Tan Guoxin Ren Shilong Zhu Haiying Yuan Luanfeng Gao Xiaofang Zhu Bin Li Yulu Hu National Key Laboratory of Science and Technology on Vacuum Electronics Key Laboratory of Large-Scale Electromagnetic Industrial Software Ministry of Education School of Electronic Science and Engineering UESTC Chengdu P.R. China Shenzhen Institute for Advanced Study UESTC Shenzhen P.R. China

ISBN: (数字)9798350348705

ISBN: (纸本)9798350348712

The Extended Interaction Klystron (EIK) amplifier is a high-power, high-frequency microwave device widely used in millimeter-wave band. Through the input cavity of an extended interaction klystron, the external microwave signal is introduced and the microwave electric field is established across the cavity gap, thus, the passing electron beam is modulated. This paper analyzes the key considerations in the cavity design of extended interaction klystrons, which encompass operating mode, synchronization condition, effective impedance and normalized electron beam conductance. Finally, a 9-gaps input cavity for W-band extended interaction klystron is designed and analyzed using CST Studio Suite.

关键词： Electron beams Klystrons Microwave amplifiers Vacuum electronics Synchronization Impedance Electron sources Electric fields

来源：评论

学校读者我要写书评

暂无评论

Directly wireless communication of human minds via non-invasive brain-computer-metasurface platform

引用

eLight 2022年第1期2卷 132-142页

作者： Qian Ma Wei Gao Qiang Xiao Lingsong Ding Tianyi Gao Yajun Zhou Xinxin Gao Tao Yan Che Liu Ze Gu Xianghong Kong Qammer HAbbasi Lianlin Li Cheng‑Wei Qiu Yuanqing Li Tie Jun Cui Institute of Electromagnetic Space Southeast UniversityNanjing 210096China School of Automation Science and Engineering South China University of TechnologyGuangzhou 510641China State Key Laboratory of Millimeter Wave Southeast UniversityNanjing 210096China Center of Intelligent Metamaterials Pazhou Laboratory Guangzhou 510330China Research Center for Brain-Computer Interface Pazhou LabGuangzhou 510330China Department of Electrical and Computer Engineering National University of SingaporeSingaporeSingapore University of Glasgow James Watt School of EngineeringGlasgow G128QQUK State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsPeking UniversityBeijing 100871China

Brain-computer interfaces(BCIs),invasive or non-invasive,have projected unparalleled vision and promise for assisting patients in need to better their interaction with the *** by the BCI-based rehabilitation technologies for nerve-system impairments and amputation,we propose an electromagnetic brain-computer-metasurface(EBCM)paradigm,regulated by human’s cognition by brain signals directly and *** experimentally show that our EBCM platform can translate human’s mind from evoked potentials of P300-based electroencephalography to digital coding information in the electromagnetic domain non-invasively,which can be further processed and transported by an information metasurface in automated and wireless *** wireless communications of the human minds are performed between two EBCM operators with accurate text ***,several other proof-of-concept mind-control schemes are presented using the same EBCM platform,exhibiting flexibly-customized capabilities of information processing and synthesis like visual-beam scanning,wave modulations,and pattern encoding.

关键词： communication computer surface

来源：评论

学校读者我要写书评

暂无评论

IDP-PGFE: An Interpretable Disruption Predictor based on Physics-Guided Feature Extraction

arXiv

引用

arXiv 2022年

作者： Shen, Chengshuo Zheng, Wei Ding, Yonghua Ai, Xinkun Xue, Fengming Zhong, Yu Wang, Nengchao Gao, Li Chen, Zhipeng Yang, Zhoujun Chen, Zhongyong 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

Disruption prediction has made rapid progress in recent years, especially in machine learning (ML)-based methods. If a disruption prediction model can be interpreted, it can tell why certain samples are classified as disruption precursors. This allows us to tell the types of incoming disruption for disruption avoidance and gives us insight into the mechanism of disruption. This paper presents a disruption predictor called Interpretable Disruption Predictor based on Physics-Guided Feature Extraction (IDP-PGFE) and its results on J-TEXT experiment data. The prediction performance of IDP-PGFE with physics-guided features is effectively improved (TPR = 97.27%, FPR = 5.45%, AUC = 0.98) compared to the models with raw signal input. The validity of the interpretation results is ensured by the high performance of the model. The interpretability study using an attribution technique provides an understanding of J-TEXT disruption and conforms to our prior comprehension of disruption. Furthermore, IDP-PGFE gives a possible mean on inferring the underlying cause of the disruption and how interventions affect the disruption process in J-TEXT. The interpretation results and the experimental phenomenon have a high degree of conformity. The interpretation results also gives a possible experimental analysis direction that the RMPs delays the density limit disruption by affecting both the MHD instabilities and the radiation profile. PGFE could also reduce the data requirement of IDP-PGFE to 10% of the training data required to train a model on raw signals. This made it possible to be transferred to the next-generation tokamaks, which cannot provide large amounts of data. Therefore, IDP-PGFE is an effective approach to exploring disruption mechanisms and transferring disruption prediction models to future tokamaks. Copyright © 2022, The Authors. All rights reserved.

关键词： Tokamak devices

来源：评论

学校读者我要写书评

暂无评论

Optimal Allocation and Two-Level Control of Reactive Power for Balancing Voltage and Power Factor of Renewable Energy Stations

引用

IEEE Transactions on Sustainable Energy 2025年

作者： Zhang, Xinhao Zhou, Hongyu Yao, Wei Xiong, Yongxin Ruan, Yimin Xiao, Bitao Wen, Jinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China The Hong Kong Polytechnic University Department of Electrical and Electronic Engineering 999077 Hong Kong Guodian Nanjing Automation Co. Ltd. Nanjing210032 China

Renewable energy stations(RES) must satisfy voltage security and power factor requirements for safe and efficient operation. However, these requirements often conflict, posing challenges in practical applications. This paper first analyzes the constraints and identifies the boundary of RES voltage regulation capability under power factor constraints. Building on the analysis, an optimal allocation and two-level control (TLC) of reactive power is proposed. It integrates the optimization of reactive power compensator (RPC) with the coordinated control of reactive resources, thereby balancing voltage regulation and power factor. From the allocation perspective, an RPC optimization method is proposed to maximize the feasible voltage range of RES under varying active power conditions of RES. From the control perspective, a TLC scheme is proposed, combining station and unit control. At the station level, the controller features a mode-switching function and calculates the overall reactive power reference value. At the unit level, the controller coordinates the converter-interfaced generations (CIGs) and RPC. Case studies are conducted on a real RES project in Bazhou, Xinjiang, China. Matlab/Simulink and Opal-RT real-time simulation results demonstrate that the proposed method enhances both voltage security and economic efficiency. © 2010-2012 IEEE.

关键词： Solar fuels

来源：评论

学校读者我要写书评

暂无评论

Sinusoidal and nonsinusoidal patterns in amplitude envelope synchronization

引用

Physical Review E 2022年第4期105卷 044209-044209页

作者： Hanchang Liu Weiqing Liu Chaoxin Fu Meng Zhan School of Science Jiangxi University of Science and Technology Ganzhou 341000 China School of Electronic Information and Communications Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

In this work, amplitude envelope synchronization (AES), as a general phenomenon characterized with highly correlated amplitude envelope but uncorrelated phases and frequencies in coupled nonidentical nonlinear systems, is investigated theoretically and numerically. Two different types of AES patterns, including sinusoidal and nonsinusoidal, are widely observable in coupled periodic and/or chaotic oscillators. They both come from modulation of phase mismatch on amplitude but show different patterns due to different behaviors of phase mismatch. With increase of frequency mismatch, the system tends to crossover from nonsinusoidal to sinusoidal AES. With the aid of synchronization manifold and transverse stability analyses of the AES state, the physical mechanism and scale relations for the AES are well revealed. We expect that all these results could uncover the generality of AES in coupled nonlinear oscillators and help to understand the rich dynamics of phase and amplitude coupling in multidisciplinary fields.

关键词： Coupled oscillators Synchronization

来源：评论

学校读者我要写书评

暂无评论

Review on Optimal Operation Models and Intelligent Solving Algorithms of Cascade Hydropower Stations 4

Review on Optimal Operation Models and Intelligent Solving A...

引用

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Si, Dajun Liang, Shuhao Sun, Peng Wu, Yaowu Li, Lingfang Wang, Yuan Center Yunnan Power Grid Co. Ltd. Power Grid Planning and Construction Research Kunming China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

The optimal operation of cascade power stations is not only one of the main development directions for the comprehensive exploitation, utilization and management of water resources, but also an important strategic direction for the sustainable development of national energy. This article starting with the overview and composition of the cascade power station group, expounds the operation characteristics and task requirements of cascade hydropower under different time scales, and provides a comprehensive overview of the objective functions and constraints of medium and long-term scheduling, short-term scheduling, and day-ahead scheduling. Then this article analyzes and compares the current intelligent solution algorithms for optimal operation of cascade hydropower stations at home and abroad, and finally gives an outlook on the future research about the participation of cascade hydropower in the electricity market. © 2021 IEEE.

关键词： Scheduling

来源：评论

学校读者我要写书评

暂无评论

Solution for Invasion of Stray Current from Traction Power Supply System on AC Power System

Solution for Invasion of Stray Current from Traction Power S...

引用

Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Jinli Zhu Chengxiong Mao Zhaoyuan Wang Dan Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (of HUST) Wuhan China

ISBN: (纸本)9781728164021

The stray current generated by the urban traction power supply system will invade the AC power system through the grounded transformer, and the intuitive impact is the abnormal operation of the transformer, such as the increase of noise and temperature. Based on the field measurement and characteristic analysis of neutral current, this paper presents the principle of stray current from traction power supply system invading AC network. To mitigate the stray current at the neutral point, a capacitor and a converter are connected in series to block the DC and harmonic currents respectively. And the influence of the series connection with the neutral point on the relay protection is discussed, and based on this, a reliable and reasonable bypass protection unit composed of the mechanical switch and the electronic switch is configured to ensure the safe operation of the system. The developed device has been tested and will be applied in the field substation.

关键词： Temperature measurement Semiconductor device measurement Substations Protective relaying Switches Power system harmonics Harmonic analysis

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：