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

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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

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

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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

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Sky Image Analysis and Solar power Forecasting: A Convolutional Neural Network Approach

Renewable Energy and Power Quality Journal

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Renewable Energy and power Quality Journal 2023年 21卷 456-461页

作者： Jakoplić, A. Vlahinić, S. Dobraš, B. Franković, D. Department of Electric Power Systems University of Rijeka Faculty of Engineering Vukovarska 58 Rijeka51000 Croatia Department of Automation and Electronics University of Rijeka Faculty of Engineering Vukovarska 58 Rijeka51000 Croatia

Recently, the share of renewable sources in the energy mix of production units has been steadily increasing. The unpredictability of renewable sources leads to difficulties in planning, managing and controlling the electric energy system (EES). One of the ways to reduce the negative impact of unpredictable renewable sources is to predict the availability of these energy sources. Short-term forecasting of photovoltaic power plant production is one of the tools that enable greater integration of renewable energy sources into the EES. One way to gather information for the short-term forecast production model is to continuously photograph the hemisphere above the photovoltaic power plant. By processing the data contained within the images, parameters related to the current output power of the observed power plant are obtained. This paper presents a model that utilises a convolutional neural network to analyse images of the hemispherical sky above a power plant to predict the current output power of the power plant. Estimating current production is a crucial step in developing models for short-term solar forecasts. The model was specifically developed for photovoltaic power plants and is capable of achieving high accuracy in power prediction. The estimation of power production from photovoltaic power plants enables the use of next-frame prediction for short-term forecasting. © 2023, European Association for the Development of Renewable Energy, Environment and power Quality (EA4EPQ). All rights reserved.

关键词： Solar energy

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Design and Implementation of an Underactuated Biped Robot Prototype on Compliant Ground 8

Design and Implementation of an Underactuated Biped Robot Pr...

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8th IEEE International Conference on Advanced Robotics and Mechatronics, ICARM 2023

作者： Zhou, Qian Yin, Xiong Guo, Zhilong Pei, Yu Feng, Zhao Yao, Daojin East China Jiaotong University Department of Electrical and Automation Engineering China Wuhan University Faculty of the School of Power and Mechanical Engineering China East China Jiaotong University Faculty of the Department of Electrical and Automation Engineering China

ISBN: (纸本)9798350300178

Considering the influence of the actual compliant grounds on the stable walking of the underactuated robot, a prototype of the planar underactuated biped walking robot is designed in this paper, and the simulation and experiment are carried out. Firstly, a biped robot model is established, and the compliant ground is equivalent to a spring-damping system. An adaptive feedforward control strategy is adopted to realize stable underactuated walking by controlling the robot's centroid velocity. Then, according to the control strategy, a 600mm high, 5.62kg weight planar underactuated robot prototype was produced, including the mechanical structure and software system. Finally, the underactuated walking with the step size of 0.1839m is realized through simulation and robot prototype experiment. The experimental results show that the robot prototype designed in this paper can carry out underactuated walking on different compliant grounds. © 2023 IEEE.

关键词： Machine design

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Real-time High-accuracy 3D Reconstruction Based on Texture and Geometric Features 41

Real-time High-accuracy 3D Reconstruction Based on Texture a...

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第41届中国控制会议

作者： Jiajie Kong Tianfang Zhou Haikuan Wang Wenju Zhou Key Laboratory of Power Station Automation Technology School of Mechatronic Engineering and AutomationShanghai University The Faculty of Engineering Architecture and Information TechnologyThe University of Queensland

ISBN: (数字)9789887581536

ISBN: (纸本)9781665482561

We present a robust approach for reconstructing accurate 3D model based on image features combine with geometric features using RGB-D ***,the depth image captured by RGB-D camera is filtered by our efficient algorithm to remove the intrinsic *** allows us to perform high-fidelity *** the point cloud is extracted texture and geometric features from color and depth ***,some mismatch point pairs are filtered by point color and distance statistics information.A new point cloud registration based on internal relative vector is proposed to obtain the current camera *** additional,a voxel count algorithm is proposed to register feature point and acquire an excellent fusion *** the registered feature point,the 6 DoF pose can be easily estimated from RGB-D *** results demonstrate that the proposed method have an excellent in both reconstruction and pose estimation.

关键词： 3D reconstruction point cloud registration SURF algorithm pose estimation

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Analysis of Electric Arc Furnace Influence on power Quality in Low and Medium Voltage Networks 24

Analysis of Electric Arc Furnace Influence on Power Quality ...

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24th EEEIC International Conference on Environment and Electrical engineering and 8th I and CPS Industrial and Commercial power Systems Europe, EEEIC/I and CPS Europe 2024

作者： Grabowski, Dariusz Klimas, MacIej Lange, Andrzej Silesian University of Technology Faculty of Electrical Engineering Department of Electrical Engineering and Computer Science Gliwice Poland University of Warmia and Mazury Faculty of Technical Sciences Department of Electrical and Power Eng. Electronics and Automation Olsztyn Poland

ISBN: (纸本)9798350355185

This paper focuses on analyzing power quality issues resulting from electric arc furnace operation. It highlights the challenges posed by the stochastic nature of the arc and proposes strategies to mitigate its impact on the power grid. Through measurements carried out on the medium and low voltage side of the furnace, fluctuations in parameters such as voltage, current, and power factor were observed, indicating significant disturbances in power quality. Mitigation strategies, including e.g. installing compensators, are suggested to stabilize the network and improve power quality, enhancing efficiency and reducing energy consumption and electrode usage. © 2024 IEEE.

关键词： Electric arc furnaces

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Two-Phase power Converter for Electrodynamic Vibration System

Two-Phase Power Converter for Electrodynamic Vibration Syste...

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2024 International Conference on Industrial engineering, Applications and Manufacturing, ICIEAM 2024

作者： Volskiy, Sergey German-Galkin, Sergey Kornev, Aleksandr Institute No. 3 Moscow Moscow Russia Institute Of Ship Automation And Electrical Engineering Maritime Academy Szczecin Poland St. Petersburg State Marine Technical University Faculty Of Ship Power Engineering And Automation St. Petersburg Russia

ISBN: (纸本)9798350395013

A two-phase power converter for powering an electrodynamic vibration system is considered. It has a two-phase output voltage with pulse width modulation with carrier frequency of 3200 Hz, which provides a sine wale of the output current. In such converter, electromagnetic transients at the carrier frequency are very difficult to describe mathematically. An analytical solution for transients is proposed based on taking into account only the first harmonic of the output voltage, which has a frequency range from 10 to 100 Hz. This approach significantly simplifies the analytical solution of transients. The obtained analytical solution was tested on a developed computer simulation using the Sim power Systems package, which calculates the transition processes in power converters with the greatest accuracy. Using the obtained analytical solution and a computer simulation, the PC150 YHL power converter was developed according to the specified technical requirements. The values of currents and voltages in transients obtained as a result of testing and using an analytical solution differ by no more than 4,3%, and using a computer simulation, they differ by no more than 2,3%. This article is of interest to electrical engineers who develop power converters with pulse width modulation © 2024 IEEE.

关键词： power converters

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Analysis of the Permanent Magnets Influence on the Operation of a BLDC Motor 13

Analysis of the Permanent Magnets Influence on the Operation...

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13th IEEE International Conference and Expositions on Electric and power engineering, EPEi 2024

作者： Paduraru, Bogdan-Constantin Dragomir, Alin Munteanu, Adrian Adam, Maricel Nadabaica, Stefan-Andrei Chiriac, Gabriel 'Gheorghe Asachi' Technical University of Iasi Faculty of Electrical Engineering Department of Power Engineering Iasi Romania 'Gheorghe Asachi' Technical University of Iasi Faculty of Electrical Engineering Department of Electrical Engineering Iasi Romania 'Gheorghe Asachi' Technical University of Iasi Faculty of Electrical Engineering Department of Utilisation Electrical Drives and Industrial Automation Romania

ISBN: (纸本)9798350356199

This analysis was made on the structure of the permanent magnets located on the rotor exterior of the BLDC electric scooter motor, three different case studies were carried out to allow us a view of the change in the polar coverage factor. After the analysis of the three cases, we realized that the structure of the permanent magnets was modified in the case of the studied BLDC-type motor, which led to a decrease in its performance, which confirms the fact that the analysis done in the research paper remains the most reliable and cheapest for this type of BLDC motor for the electric scooter. © 2024 IEEE.

关键词： Permanent magnets

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Research on A New Type of Low Current Grounding System Based on Arc Suppression Coil 6

Research on A New Type of Low Current Grounding System Based...

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6th International Conference on power and Energy Applications, ICPEA 2023

作者： Jing, Gao Sibo, Xu Siyu, Teng Yingqi, Xu Hongtao, Wang Jinming, Luo Shenyang Institute of Engineering Institute of Electric Power Shenyang China Shenyang Institute of Engineering Graduate Faculty Shenyang China Shenyang Institute of Engineering School of Automation Shenyang China

ISBN: (纸本)9798350359053

China's power distribution network covers a wide range, the structure is complex and changeable, and random faults often occur. The neutral ground mode plays a decisive role in fault discovery and process as well as the operation of distribution network. This paper discusses a new type of low current grounding system that uses arc suppression coil parallel resistance grounding, which can satisfy the problems of eliminating arc and fast line selection and tripping at the same time and verifies the characteristics of this grounding system through simulation. © 2023 IEEE.

关键词： Electric power distribution

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Advanced Encoderless Control System-based Split-Source Inverter for Induction Motor Drives

Advanced Encoderless Control System-based Split-Source Inver...

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2023 IEEE IAS Global Conference on Emerging Technologies, GlobConET 2023

作者： Hussien, Mohamed G. Cao, Lingling Islam, Md. Rabiul School of Mechanical Engineering and Automation Shenzhen China Tanta University Faculty of Engineering Electrical Power and Machines Engineering Department Tanta Egypt University of Wollongong School of Electrical Computer and Telecommunications Engineering Faculty of Engineering and Information Sciences Wollongong Australia

ISBN: (纸本)9798350331790

The purpose of this study is to construct a sensorless vector control system for an induction motor (IM) with a promising split-source inverter (SSI) arrangement, along with an effective speed estimation approach. Indirect Magnetic Field Orientation Scheme (IRFOC) is a simplified approach that will be presented for monitoring the rotor speed signal based on the relation of phase-axis for the motor. Extensive analysis to assure the observability of the suggested split-source inverter-based sensorless control system is carried out, and it is supported by results from typical functional tests and parameter modifications. In comparison to the sensorless vector control approach, the results demonstrate the efficacy of the suggested speed estimation method as well as the observability and robustness of the implemented system. © 2023 IEEE.

关键词： Induction motors

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