检索结果-内蒙古大学图书馆

23rd International Symposium on High Voltage engineering, ISH 2023

作者： Leite Neto, Antonio F. Guedes, Edson G. Vilar, Pablo B. Lira, George R.S. Andrade, Filipe L.M. Melo, João Victor J. Junior, Almir C.S. Marotti, Ana C.F. Costa, André I. Souza, João Paulo A. Electrical Engineering Graduate Program Federal University of Campina Grande Campina Grande Brazil Department of Electrical Engineering Federal University of Campina Grande Campina Grande Brazil Department of Electrical Engineering Federal Institute of Paraiba Patos Brazil Eletrobras Furnas Electric Power Furnas Rio de Janeiro Brazil Concert Concert Technologies Belo Horizonte Brazil

ISBN: (纸本)9781839539954

Failures in Current Transformers (CTs) can have a significant financial impact on utilities, causing revenue loss, service interruptions, and even damage to nearby equipment. To minimize the effects of CT degradation on the electrical system, predictive techniques and continuous monitoring are essential. One such tool that can aid in the supervision and diagnosis of equipment in service is the loss tangent. This parameter is directly related to the aging and degradation of electrical insulation, making it a useful indicator of possible failures in CTs. Therefore, this work aims to perform computer simulations using the finite element method (FEM) to simulate the effect of oil and paper degradation on the loss tangent values of a 230 kV current transformer. To achieve this, the COMSOL Multiphysics® software was used to verify the loss tangent as a function of the conductivity of parameters correlated to the CT dielectric. The results of the simulations show that the degradation of oil and paper substantially increases the value of the loss tangent. Additionally, it was found that the simultaneous or individual degradation of oil and paper have different effects on the loss tangent values obtained. The findings of this study demonstrate the usefulness of loss tangent as a tool for the diagnosis and supervision of electrical equipment in service. © The Institution of engineering & Technology 2023.

关键词： Distribution transformers

来源：评论

学校读者我要写书评

暂无评论

Modeling Small Signal Analysis Using Kharitonov’s Theorem Case: Inverter Based Microgrid

Modeling Small Signal Analysis Using Kharitonov’s Theorem C...

引用

International Conference on High Voltage engineering and power Systems (ICHVEPS)

作者： Jason Kevin M. Banjar-Nahor Nanang Hariyanto Electrical Power Engineering Study Program Bandung Institute of Technology Bandung Indonesia

Microgrid systems are becoming more popular and the main component in a microgrid system is generation, which in a microgrid system usually consists of distributed generations (DGs). Because the renewable energy (RE) generators are an inverter-based generator, a microgrid dominated by RE generators is called inverter-based microgrid. Due to intermittency of RE generator, such as solar PV, the RE power generation variation may cause instability. The conventional method to analyze system stability due to the variation of loads and generation is modal analysis. In this experiment the proposed method for analyzing small signal stability is by using Kharitonov’s Theorem. The objective of this experiment is to analyze inverter-based stability using Kharitonov’s Theorem and compare it to the result using conventional analysis method which is modal analysis. Using Kharitonov’s Theorem, the system stability can be determined for several operation scenarios within certain time range. In this experiment, the inverter-based microgrid will be modeled using DIgSILENT powerFactory and the system matrices will be exported into MATLAB software to be analyzed and converted to four transfer functions using Kharitonov’s Theorem. The four output transfer function will determined the system small signal stability of modeled microgrid in one day operation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Adaptive Control Applied to Half-Bridge Synchronous Buck Converter using LCL Filter for Charging Batteries 16

Adaptive Control Applied to Half-Bridge Synchronous Buck Con...

引用

16th Seminar on power Electronics and Control, SEPOC 2024

作者： Rodrigues, Vinicius Descovi Merlo, Joao Vitor Tibola, Jonas Roberto Tambara, Rodrigo Varella Federal University of Santa Maria Research and Development Center in Electrical Engineering NUPEDEE Santa Maria Brazil Federal University of Santa Maria Graduate Program in Electrical Engineering PPGEE Santa Maria Brazil Federal University of Santa Maria Research and Development Center in Electrical and Computational Systems GSEC Santa Maria Brazil Federal University of Santa Maria Group of Power Electronics and Control GEPOC Santa Maria Brazil

ISBN: (纸本)9798350379419

This paper proposes a discrete-time Model Reference Adaptive Controller (MRAC), applied to a Half-Bridge synchronous buck converter for charging batteries. The system uses an LCL filter that interfaces the power converter and the batteries. A virtual plant method is proposed for better transitory response of the adaptive control system. The model reference utilizes a reduced order, to simplify the project of the adaptive controller. Simulation results are presented for validation of the control project. © 2024 IEEE.

关键词： Buck converter

来源：评论

学校读者我要写书评

暂无评论

RFID-Based Smart Secure E-Bike Parking Station

RFID-Based Smart Secure E-Bike Parking Station

引用

International Conference on electrical engineering, Computer Science and Informatics (EECSI)

作者： Tole Sutikno Tri Wahono Haris Imam Karim Fathurrahman Watra Arsadiando Hendril Satrian P Master Program of Electrical Engineering Universitas Ahmad Dahlan Yogyakarta Indonesia Undergraduate Program of Electrical Engineering Universitas Ahmad Dahlan Yogyakarta Indonesia Embedded System and Power Electronics Research Group (ESPERG) Yogyakarta Indonesia

ISBN: (数字)9798350355314

ISBN: (纸本)9798350355321

This research discusses the safety challenges faced by bicycle smart parking systems, which are often irregular and unsafe, especially in Indonesia. The purpose of this research is to develop an RFID-based smart parking system for electric bicycles that improves user safety and accessibility. The system is designed using components such as the NodeMCU 8266 microcontroller, RFID module, and solenoid lock, and is tested under real-world conditions. Using the $\mathrm{C}++$ programming language to be embedded in a microcontroller. Quantitative results show that the system achieved an 80% success rate in RFID detection on various materials with optimal performance through acrylic barriers. The system demonstrates better safety compared to traditional bicycle parking solutions, which contributes to increased public confidence in the safety of electric bicycles.

关键词： Microcontrollers Urban areas Metals Bicycles Materials reliability Automated parking Safety Solenoids Informatics Radiofrequency identification

来源：评论

学校读者我要写书评

暂无评论

Internet of Things-Based Early Forest Fire Detection System with *** Platform

Internet of Things-Based Early Forest Fire Detection System ...

引用

International Conference on electrical engineering, Computer Science and Informatics (EECSI)

作者： Tole Sutikno Son Ali Akbar Tosan Aji Bayusuta Liya Yusrina Sabila P Hendril Satrian Master Program of Electrical Engineering Universitas Ahmad Dahlan Yogyakarta Indonesia Undergraduate Program of Electrical Engineering Universitas Ahmad Dahlan Yogyakarta Indonesia Embedded System and Power Electronics Research Group (ESPERG) Yogyakarta Indonesia

ISBN: (数字)9798350355314

ISBN: (纸本)9798350355321

Forest and land fires in Indonesia are a major concern for the government when entering the dry season. The researchers have widely developed early detection technology, including satellite and airborne-based technology, but it faces several limitations due to the influence of weather and other unavoidable factors. Furthermore, fire detection technology based on wireless sensor networks (WSNs) and the Internet of Things (loT) is one of the most effective solutions. This study developed a sensor node that includes an Arduino UNO, a smoke sensor, a fire sensor, and temperature and humidity sensors and code program using C++, to detect potential forest fires. We place these nodes at fire-prone points in the forest. Additionally, the gateway node receive data from the sensor node, process it using the NodeMCU ESP8266, and send it to the *** database for real-time report. The developed system's test results demonstrate that it can display and send data in real-time to the *** platform via an internet connection. Additionally, the base station's physical 12C 20x4 LCD screen displays the information. The forest fire early warning system functions well, and the test results show good detection and data transmission capabilities.

关键词： Temperature sensors Wireless communication Wireless sensor networks Temperature Transmitters Forestry Logic gates Real-time systems Data communication Internet of Things

来源：评论

学校读者我要写书评

暂无评论

A Comprehensive Review and Evaluation of Classical MPPT Techniques for a Photovoltaic System 8th

A Comprehensive Review and Evaluation of Classical MPPT Tech...

引用

8th EAI International Conference on Advancement of Science and Technology, ICAST 2020

作者： Yetayew, Tefera T. Workineh, Tewodros G. Department of Electrical Power and Control Engineering Adama Science and Technology University Adama Ethiopia Electrical Power and Energy Program Bahirdar Institute of Technology Bahirdar Ethiopia

ISBN: (纸本)9783030806200

Extracting available maximum power is an important component of solar photovoltaic system which can be achieved by an efficient maximum power point tracking algorithm. Up to date review of related works summarized available MPPT algorithms as classical and modern optimization techniques. Among classical algorithms the incremental conductance (InCond) and perturb & observe (P&O) based tracking algorithms with duty ratio control are widely used due to relatively accurate MPP tracking capability and less implementation complexity under uniform radiation. However;steady-state oscillation, wrong perturbation direction for rapid climate change and failure to track the global peak under partial shade/mismatching operating conditions of the photovoltaic system are some of the limitations of these algorithms. Thus, in this work, a succinct review, formulations and evaluations of widely used classical techniques along with a proposed classical improved perturb and observe (IPO) to improve drawbacks of steady state oscillation has been done. The performance evaluation results of widely used classical perturbation based algorithms (InCond, P&O, IPO) using MATLAB/Simulink revealed improved performances of the improved perturbation based algorithm over the widely used classical (InCond, P&O) algorithms in reducing steady-state oscillations of step-change in irradiance without any partial shading condition of the photovoltaic (PV) of the PV system. © 2021, ICST Institute for Computer Sciences, Social Informatics and Telecommunications engineering.

关键词： Maximum power point trackers

来源：评论

学校读者我要写书评

暂无评论

Midfidelity model verification for a point-absorbing wave energy converter with linear power take-off

International Marine Energy Journal

引用

International Marine Energy Journal 2022年第1期5卷 67-75页

作者： Katsidoniotaki, Eirini Yu, Yi-Hsiang Göteman, Malin Department of Electrical Engineering Division of Electricity at Uppsala University. Lägerhyddsvägen 1 Uppsala752 37 Sweden Water Power Program at National Renewable Energy Laboratory 15013 Denver W Pkwy GoldenCO80401 United States

In the preliminary design stage of a wave energy converter (WEC), researchers need fast and reliable simulation tools. High-fidelity numerical models are usually employed to study the wave-structure interaction, but the computational cost is demanding. As an alternative, midfidelity models can provide simulations in the order of real time. In this study, we operate Uppsala University’s WEC in a relatively mild sea state and model it using WEC-Sim. The model is verified based on OpenFOAM simulations. To analyze the ability of the midfidelity model to capture WEC dynamics, we investigate the system separately with 1, 2, and 3 degrees of freedom. We examine the contribution of viscous phenomena, and study both linear and weakly nonlinear solutions provided by WEC-Sim. Our results indicate that the viscous effects can be neglected in heave and surge motion, but not for pitch. We also find that the weakly nonlinear WEC-Sim solution successfully agrees with the computational fluid dynamics, whereas the linear solution could suggest misleading results. © 2022, European Wave and Tidal Energy Conference. All rights reserved.

关键词： Computational fluid dynamics

来源：评论

学校读者我要写书评

暂无评论

Evaluation of temperature dependent vortex pinning properties in strongly pinned YBa_(2)Cu_(3)O_(7-δ)thin films with Y_(2)BaCuO_(5)nanoinclusions

引用

Superconductivity 2024年第1期9卷 95-105页

作者： Alok K.Jha Kaname Matsumoto Tomoya Horide Shrikant Saini Ataru Ichinose Paolo Mele Yutaka Yoshida Satoshi Awaji Department of Materials Science and Engineering Kyushu Institute of TechnologyTobata-kuKitakyushu 804-8550Japan Department of Mechanical and Control Engineering Kyushu Institute of TechnologyTobata-kuKitakyushu 804-8550Japan Central Research Institute of Electrical Power Industry YokosukaKanagawa 240-0196Japan College of Engineering-Innovative Global Program Shibaura Institute of TechnologyMinuma-kuSaitama 337-8570Japan Department of Energy Engineering and Science Nagoya UniversityChikusa-kuNagoya 464-8603Japan Institute for Materials Research Tohoku UniversityAoba-kuSendai 980-8577Japan

The pinning of quantized magnetic vortices in superconducting YBa_(2)Cu_(3)O_(7-δ)(YBCO or Y123)thin films with Y_(2)BaCuO_(5)(Y211)nanoinclusions have been investigated over wide temperature range(4.2-77 K).The concentration of Y211 nanoinclusions has been systematically varied inside YBCO thin films prepared by laser ablation technique using surface modified target *** pinning force density values(Fp∼0.5 TNm^(−3)at 4.2 K,9 T)have been observed for the YBCO film with moderate concentration of Y211 nanoinclusions(3.6 area%on ablation target).In addition,uniform enhancement in critical current density(J_(c))was observed in the angular dependent J_(c)measurement of YBCO+Y211 nanocomposite films.Y211 nanoinclusions have been found to be very efficient in pinning the quantized vortices thereby enhancing the in‐field J_(c)values over a wide range of *** the concentration of Y211 secondary phase into Y123 film matrix results into agglomeration of Y211 phase and observed as increased Y211 nanoparticle *** larger secondary phase nanoparticles are not as efficient pinning centers at lower temperatures as they are at higher temperatures due to substantial reduction of the coherence length at lower *** of the temperature dependence of J_(c)for YBCO+Y211 nanocomposite films has been conducted and possible vortex pinning mechanism in these nanocomposite films has been discussed.

关键词： YBCO thin film Critical current Vortex pinning Nanoscale APCs

来源：评论

学校读者我要写书评

暂无评论

A Storage and Transmission Joint Planning Method for Centralized Wind power Transmission

引用

Computers, Materials & Continua 2021年第7期68卷 1081-1097页

作者： Xiuyu Yang Qi Guo Jianzhong Gui Renyong Chai Xueyuan Liu Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology(Northeast Electric Power University) Jilin132012China Electrical Engineering-PHD program at the University of Idaho Idaho83843America State Grid Jiangxi Power Supply Company Xinyu338025China

Centralized delivery has become the main operation mode under the scaled development of wind *** channels are usually the guarantee of out-delivered wind power for large-scale wind *** configuration of transmission capacity,which has the features of low utilization and poor economy,is hardly matching correctly due to the volatility and low energy density of *** usage of energy storage can mitigate wind power fluctuations and reduce the requirement of out-delivery transmission capacity,but facing the issue of energy storage cost ***,it is necessary to optimize the allocation of energy storage while considering the problem of wind power *** paper studies the joint optimization of large-scale wind power transmission capacity and energy storage,reveals the mechanism of energy storage in order to reduce the power fluctuation of wind power base and slow down the demand of ***,analyze the multi-functional cost-sharing mode of energy storage,improve the efficiency of energy storage cost *** the coordination optimization configuration model to deal with the problem of large-scale wind power transmission capacity and energy storage,and realizes the transmission capacity optimization coordination and optimization with energy *** proposed method is verified by a wind base located in Northeast China.

关键词： Wind farm group energy storage configuration transmission capacity coordination and optimization

来源：评论

学校读者我要写书评

暂无评论

Development of Perching and Fail-Safe Module for Wall Climbing Multi-copter 10th

Development of Perching and Fail-Safe Module for Wall Cli...

引用

10th International Conference on Robot Intelligence Technology and Applications, RiTA 2022

作者： Kim, Taewan Tirtawardhana, Christian Yu, Byeongho Nahrendra, I. Made Aswin Kim, Seoktae Myung, Hyun Robotics Program Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of School of Electrical Engineering Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of KEPCO RI Korea Electric Power Corporation Daejeon34056 Korea Republic of

ISBN: (纸本)9783031268885

In recent years, various researches using UAVs (Unmanned Aerial Vehicles), especially multi-copter in various tasks, have been conducted due to their high mobility. Various perching mechanisms to perch the multi-copter onto the surface were developed for energy efficiency and to ensure safety while doing its tasks. However, developing mechanisms for multi-copter has limitations, such as limited payload. In this paper, we propose the perching and fail-safe module for the wall-climbing aerial robot "CAROS-Q" which can tilt its pose to perch on tilted surfaces. The proposed module consists of a passive perching mechanism with a specially designed suction cup to perch onto the surface safely, and a fail-safe mechanism to prevent falling from unexpected accidents. The prototype verifies the performance of the proposed module. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Energy efficiency

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：