检索结果-内蒙古大学图书馆

Evaluating transient behaviour of large-scale photovoltaic systems during lightning events using enhanced finite difference time domain method with variable cell size approach

引用

High Voltage 2024年第3期9卷 636-647页

作者： Ibrahim Hetita Diaa-Eldin A.Mansour Yang Han Ping Yang Congling Wang Mohamed M.F.Darwish Matti Lehtonen Amr S.Zalhaf School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China(UESTC)ChengduChina Electrical Power and Machines Engineering Department Faculty of EngineeringHelwan UniversityCairoEgypt Electrical Power and Machines Engineering Department Faculty of EngineeringTanta UniversityTantaEgypt Department of Electrical Power Engineering Faculty of EngineeringEgypt-Japan University of Science and TechnologyAlexandriaEgypt Department of Electrical Engineering Faculty of Engineering at ShoubraBenha UniversityCairoEgypt Department of Electrical Engineering and Automation School of Electrical EngineeringAalto UniversityEspooFinland

Photovoltaic(PV)arrays are usually installed in open areas;hence,they are vulnerable to lightning strikes that can result in cell degradation,complete damage,service disruption,and increased maintenance *** a result,it is imperative to develop an effective and efficient lightning protection system by evaluating the transient behaviour of PV arrays during lightning *** aim is to evaluate the transient analysis of large-scale PV systems when subjected to lightning strikes using the finite difference time domain(FDTD)*** overvoltages are calculated at various points within the mounting *** optimise the FDTD method's execution time and make it more suitable for less powerful hardware,a variable cell size approach is ***,larger cell dimensions are used in the earthing system and smaller cell dimensions are used in the mounting *** FDTD method is utilised to calculate the temporal variation of transient overvoltages for large-scale PV systems under different scenarios,including variations in the striking point,soil resistivity,and the presence of a metal *** results indicate that the highest transient overvoltages occur at the striking point,and these values increase with the presence of a PV metal frame as well as with higher soil ***,a comparison is performed between the overvoltage results obtained from the FDTD approach and the partial element equivalent circuit(PEEC)method at the four corner points of the mounting systems to demonstrate the superior accuracy of the FDTD ***,a laboratory experiment is conducted on a small-scale PV system to validate the simulation *** calculated overvoltages obtained from the FDTD and PEEC methods are compared with the measured values,yielding a mean absolute error of 5%and 11%for the FDTD and PEEC methods,respectively,thereby confirming the accuracy of the FDTD simulation model.

关键词： transient behaviour finite

来源：评论

学校读者我要写书评

暂无评论

Measuring the Level of e-Commerce Usability in the electrical and informatics engineering department Using the System Usability Scale 8

Measuring the Level of e-Commerce Usability in the Electrica...

引用

8th International Conference on electrical, Electronics and Information engineering, ICEEIE 2023

作者： Akbar, Muhammad Iqbal Smaragdina, Azhar Ahmad Ningrum, Gres Dyah Kusuma Fritama, Muhammad Anandha Pratama, Wahyu Setyo Universitas Negeri Malang Electrical and Informatics Engineering Department Malang Indonesia

ISBN: (纸本)9798350340501

In this study, Tech Zone Plaza conducted a testing phase using the system usability scale method, which is used with the aim of measuring how good a user experience is from software. The results of this test is used as a reference for improving and adjusting the user interface based on the result and input from the test. Testing Tech Zone Plaza e-commerce uses System Usability Scale (SUS) Methods. There are several steps that must be followed in conducting a system usability scale. The steps are divided into 3 parts, Preparation, Execution, and Analysis The overall average SUS score is 74, on a scale of 0 to 100, indicating a moderately positive perception of the system's usability. According to the findings of this study, SUS ratings and individual responder feedback provide essential information for evaluating the system's usability. They serve as critical indications of strengths and shortcomings, highlighting areas for improvement and informing decision-making to improve the user experience. A full knowledge of the system's usability may be obtained by supplementing quantitative data from SUS scores with qualitative input from users, resulting in a system that better matches user expectations and requirements. © 2023 IEEE.

关键词： User interfaces

来源：评论

学校读者我要写书评

暂无评论

A new technique for fault diagnosis in transformer insulating oil based on infrared spectroscopy measurements

引用

High Voltage 2024年第2期9卷 319-335页

作者： Mohamed M.F.Darwish Mohamed H.A.Hassan Nagat M.K.Abdel-Gawad Matti Lehtonen Diaa-Eldin A.Mansour Department of Electrical Engineering Faculty of Engineering at ShoubraBenha UniversityCairoEgypt Department of Electrical Engineering and Automation School of Electrical EngineeringAalto UniversityEspooFinland Department of Electrical Power Engineering Egypt-Japan University of Science and Technology(E-JUST)New Borg El-Arab CityEgypt Department of Electrical Power and Machines Engineering Faculty of EngineeringTanta UniversityTantaEgypt

Condition monitoring of the insulating system within power transformers has a massive importance according to the electrical *** gas analysis(DGA)is frequently used for this ***,DGA lacks the necessary level of accuracy to identify all equipment faults,particularly in their initial stages of ***,it does not have the capability for real-time monitoring and relies on manual sampling and laboratory testing,causing potential delays in fault ***,the interpretation of DGA data necessitates specialised expertise,which may pose difficulties for smaller entities that have limited access to ***,the contribution of this research is to use infrared spectroscopy measurements as a new effective technique substituting the DGA method for fault diagnosis in insulating *** inception faults that were considered in this study were the electrical fault(discharges of high energy)and the thermal fault(300°C

关键词： fault diagnosis spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Two-stage Optimal Scheduling of Community Integrated Energy System Considering Operation Sequences of Hydrogen Energy Storage Systems

引用

Journal of Modern power Systems and Clean Energy 2025年第1期13卷 276-288页

作者： Wei Kong Kai Sun Jinghong Zhao School of Electrical Engineering Naval University of EngineeringWuhanChina Department of Electrical Engineering State Key Laboratory of Power System Operation and ControlTsinghua UniversityBeijingChina

The hydrogen energy storage system(HESS)integrated with renewable energy power generation exhibits low reliability and flexibility under source-load *** address the above issues,a two-stage optimal scheduling model considering the operation sequences of HESSs is proposed for commercial community integrated energy systems(CIESs)with power to hydrogen and heat(P2HH)*** aims to optimize the energy flow of HESS and improve the flexibility of hydrogen production and the reliability of energy supply for ***,the refined operation model of HESS is established,and its operation model is linearized according to the operation domain of HESS,which simplifies the difficulty in solving the optimization problem under the premise of maintaining high approximate ***,considering the flexible start-stop of alkaline electrolyzer(AEL)and the avoidance of multiple energy conversions,the operation sequences of HESS are ***,a two-stage optimal scheduling model combining day-ahead economic optimization and intra-day rolling optimization is established,and the model is simulated and verified using the source-load prediction data of typical days in each *** simulation results show that the two-stage optimal scheduling reduces the total load offset by about 14%while maintaining similar operating cost to the day-ahead economic optimal ***,by formulating the operation sequences of HESS,the operating cost of CIES is reduced by up to about 4.4%.

关键词： Community integrated energy system(CIES) hydrogen storage operation sequence two-stage optimal scheduling

来源：评论

学校读者我要写书评

暂无评论

Price-based Demand Response Supported Three-stage Hierarchically Coordinated Voltage Control for Microgrids

引用

Journal of Modern power Systems and Clean Energy 2025年第1期13卷 338-350页

作者： Bo Wang Cuo Zhang Xingying Chen Yan Xu Kun Yu Haochen Hua Zhao Yang Dong School of Electrical and Power Engineering Hohai UniversityNanjing 211100China School of Electrical and Computer Engineering The University of SydneySydneyNSW2006Australia Center for Power Engineering(CPE) School of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore 639798Singapore Department of Electrical Engineering City University of Hong KongHong KongChina

Photovoltaic(PV)inverter,as a promising voltage/var control(VVC)resource,can supply flexible reactive power to reduce microgrid power loss and regulate bus ***,active power plays a significant role in microgrid voltage ***-based demand response(PBDR)can shift load demand via determining time-varying prices,which can be regarded as an effective means for active power ***,due to the different characteristics,PBDR and inverter-based VVC lack systematic ***,this paper proposes a PBDR-supported three-stage hierarchically coordinated voltage control method,including day-ahead PBDR price scheduling,hour-ahead reactive power dispatch of PV inverters,and realtime local droop control of PV *** their mutual influence,a stochastic optimization method is utilized to centrally or hierarchically coordinate adjacent two *** solve the bilinear constraints of droop control function,the problem is reformulated into a second-order cone programming relaxation ***,the concave constraints are convexified,forming a penalty convex-concave model for feasible solution ***,a convex-concave procedure-based solution algorithm is proposed to iteratively solve the penalty *** proposed method is tested on 33-bus and IEEE 123-bus distribution networks and compared with other *** results verify the high efficiency of the proposed method to achieve power loss reduction and voltage regulation.

关键词： Photovoltaic inverter voltage control demand response convex-concave procedure second-order cone programming relaxation

来源：评论

学校读者我要写书评

暂无评论

Enhancing microgrid renewable energy integration at SEKEM farm

引用

Global Energy Interconnection 2024年第6期7卷 761-772页

作者： Mohamed.M.Reda Mohamed I.Elsayed M.A.Moustafa Hassan Hatem M.Seoudy Department of Electrical Engineering May UniversityCairo 11769Egypt Department of Electrical Engineering El-Azhar university 11651CairoEgypt Department of Electrical power Cairo UniversityCairo 12613Egypt Department of Electrical power and machine The Higher Institute of EngineeringElshorouk 11765Egypt

This study explores the feasibility of implementing a hybrid microgrid system powered by renewable energy *** solar photovoltaics,wind energy,and fuel cells to ensure a reliable and sustainable electricity supply for the SEKEM farm in WAHAT,*** study utilizes MATLAB/Simulink software to conduct simulations based on sun irradiation and wind speed *** control techniques,such as the proportional-integral(PI)controller,Fuzzy Logic Controller for PI tuning(fuzzy-PI),and neuro-fuzzy controllers,were evaluated to improve the performance of the *** results demonstrate that the Fuzzy-PI control strategy outperforms the alternative control systems,enhancing the overall dependability and long-term viability of energy *** hybrid system was integrated with a voltage source control(VSC)and fuzzy PI controller,which effectively addressed power fluctuations and improved the stability and reliability of the energy ***,it provides insightful information on how to design and implement a 100%renewable energy system,with the fuzzy PI controller emerging as a viable method of control that can guarantee the system’s resilience and outperform other approaches,such as the standalone PI controller and the neuro-fuzzy controller.

关键词： SEKEM farm Neuro-fuzzy Microgrid hybrid system Fuzzy-PI

来源：评论

学校读者我要写书评

暂无评论

Temporal and Spatial Optimization for 5G Base Station Groups in Distribution Networks

引用

Journal of Modern power Systems and Clean Energy 2024年第4期12卷 1159-1169页

作者： Silu Zhang Nian Liu Jianpei Han Department of Electrical and Electronic Engineering North China Electric Power UniversityBeijingChina

With the large-scale connection of 5G base stations(BSs)to the distribution networks(DNs),5G BSs are utilized as flexible loads to participate in the peak load regulation,where the BSs can be divided into base station groups(BSGs)to realize inter-district energy transfer.A Stackelberg game-based optimization framework is proposed,where the distribution net-work operator(DNO)works as a leader with dynamic pricing for multi-BSGs;while BSGs serve as followers with the ability of demand response to adjust their charging and discharging strategies in temporal dimension and load migration strategy in spatial ***,the presence and uniqueness of the Stackelberg equilibrium(SE)are ***,differential evolution is adopted to reach the SE and the optimization problem in multi-BSGs is decomposed to solve the time-space ***,through simulation of a practical system,the results show that the DNO operation profit is increased via cutting down the peak load and the operation costs for multi-BSGs are reduced,which reaches a winwin effect.

关键词： 5G base station dynamic pricing demand response energy storage load migration Stackelberg game optimization

来源：评论

学校读者我要写书评

暂无评论

Evaluation of Impressed Potential on Buried Pipelines near HVDC Grounding Electrodes Considering the Polarization Effect

引用

CSEE Journal of power and Energy Systems 2024年第6期10卷 2667-2674页

作者： Bo Zhang Fangyuan Cao Xiaobo Meng State Key Lab of Power System Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Department of Mechanical and Electrical Engineering Guangzhou UniversityGuangzhou 510080China

When a long distance HVDC transmission system discharges current into the earth through its grounding electrode,ground potential differences appear in a large *** therefore part of the DC current may flow into nearby pipelines which may be dangerous to the equipment and personnel,and may aggravate *** this paper,an equivalent circuit based on the method of moments is introduced to calculate the current and potential distributions along a pipeline with damaged anticorrosive *** current-dependent electrochemical polarization potential between soil and the metal pipe,due to the damage of the anticorrosive coating,is taken into account by using the Newton-Raphson *** circuit is verified through a reduced scale *** examining the circuit,the effect of the damaged anticorrosive coating on the leakage current and the pipe potential with respect to soil along the pipeline is analyzed.

关键词： Circuit modeling corrosion grounding HVDC Transmission moment methods pipeline polarization

来源：评论

学校读者我要写书评

暂无评论

power System Reliability Evaluation Based on Sequential Monte Carlo Simulation Considering Multiple Failure Modes of Components

引用

Journal of Modern power Systems and Clean Energy 2025年第1期13卷 202-214页

作者： Wei Huang Bo Hu Changzheng Shao Wei Li Xiaozhe Wang Kaigui Xie C.Y.Chung State Key Laboratory of Power Transmission Equipment Technology School of Electrical EngineeringChongqing UniversityChongqingChina China Southern Power Grid GuangzhouChina Department of Electrical and Computer Engineering McGill UniversityMontrealCanada Department of Electrical and Electronic Engineering Hong Kong Polytechnic UniversityHong KongChina

The component aging has become a significant concern worldwide,and the frequent failures pose a serious threat to the reliability of modern power *** light of this issue,this paper presents a power system reliability evaluation method based on sequential Monte Carlo simulation(SMCS)to quantify system reliability considering multiple failure modes of ***,a three-state component reliability model is established to explicitly describe the state transition process of the component subject to both aging failure and random failure *** this model,the impact of each failure mode is decoupled and characterized as the combination of two state duration variables,which are separately modeled using specific probability ***,SMCS is used to integrate the three-state component reliability model for state transition sequence generation and system reliability ***,various reliability metrics,including the probability of load curtailment(PLC),expected frequency of load curtailment(EFLC),and expected energy not supplied(EENS),can be *** ensure the applicability of the proposed method,Hash table grouping and the maximum feasible load level judgment techniques are jointly adopted to enhance its computational *** studies are conducted on different aging scenarios to illustrate and validate the effectiveness and practicality of the proposed method.

关键词： power system reliability evaluation aging failure sequential Monte Carlo simulation

来源：评论

学校读者我要写书评

暂无评论

Enhancing VTOL control using twin delayed deep deterministic policy gradient-based controller

引用

International Journal of Intelligent Systems Technologies and Applications 2024年第4期22卷 378-404页

作者： Al-Radhi, Haitham M. El-Metwally, Khaled A. Department of Electrical Power Engineering Faculty of Engineering Cairo University Giza Egypt

This study presents the application of a twin delayed deep deterministic policy gradient (TD3) based controller for vertical take-off and landing (VTOL) system control. The TD3 algorithm is a deep reinforcement learning (DRL) algorithm (actor-critic type) designed for continuous control problems. The DRL agent learns to optimise actions to maximise rewards by interacting with the environment. VTOL aircraft is a nonlinear system that shows high complexity with variable aerodynamic parameters during the flight. The proposed controller is implemented on a one-degree-of-freedom VTOL system. The performance of the proposed controller is compared to that of a PID controller and a deep deterministic policy gradient (DDPG) based controller, another DRL algorithm. The evaluation includes analysing step response characteristics and the sum square of errors. MATLAB and Simulink are utilised for the implementation and analysis. The results indicate that the TD3-based controller exhibits performance better than the PID controller with reduced settling time and free overshoot. Copyright © 2024 Inderscience Enterprises Ltd.

关键词： Deep reinforcement learning

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：