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2023 International Conference on Smart Energy systems and Technologies, SEST 2023

作者： Barac, Bojana Krpan, Matej Capuder, Tomislav University of Zagreb Faculty of Electrical Engineering and Computing Department of Energy and Power Systems Zagreb Croatia

ISBN: (纸本)9798350397901

The massive penetration of distributed energy resources (DER) encourages the provision of frequency regulation services at the distribution network level following large frequency disturbances occurring at the transmission system side. The availability of reduced-order or aggregated models will facilitate the coordination between transmission and distribution system operators. As there are no models that can capture the dynamics of diverse distributed technologies and their control systems by a unified single device model, this paper presents the single equivalent device based on the virtual synchronous machine (VSM) technology that can subsume the frequency response of different DER and loads. The validation of the proposed model is performed on the adjusted IEEE 9-bus system for different multi-energy systems. Simulated scenarios have demonstrated the accuracy of proposed aggregation with a maximum relative error of 0.1% as well as computational improvement of almost 100%. © 2023 IEEE.

关键词： Electric power distribution

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Incorporating a High-speed Camera in the Lightning Current Measurement system for Wind Turbines 4

Incorporating a High-speed Camera in the Lightning Current M...

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4th International Conference on Smart Grid Metrology, SMAGRIMET 2023

作者： Vukovic, Franjo Milardic, Viktor Filipovic-Grcic, Bozidar Stipetic, Nina Franc, Bojan Milos, Dominik University of Zagreb Faculty of Electrical Engineering and Computing Department of Energy and Power Systems Zagreb Croatia

ISBN: (纸本)9798350323597

A lightning current measurement system for wind turbines was developed and tested in the High Voltage Laboratory at the faculty of electrical engineering and computing, University of Zagreb, to determine actual distributions of lightning current parameters in a particular wind turbine area. The output of the measurement system is a waveform of lightning current. The measurement system consists of two current sensors with different frequency and amplitude ranges and a real-Time controller with two digitizers and a GPS module. The current sensors are Rogowski coils connected to integrators with coaxial cables. The prototype was installed on a wind turbine in a high winter lightning activity area. The current stage of development involves integrating the high-speed camera into the prototype measurement system to obtain the visual confirmation of the waveform measurements and help categorize lightning strikes into downward or upward strikes. The camera control application was developed in LabVIEW. The camera was set to trigger by the real-Time controller. Also, a redundant trigger occurs when there is a change in motion in the camera frame in case the prototype measurement system fails to register a lightning strike and therefore fails to send a trigger signal to the camera. The camera control application was tested in the High Voltage Laboratory by recording a flashover in a spark gap and a flashover on the insulator. © 2023 IEEE.

关键词： High speed cameras

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Line Parameter and Switching State Identification Method for Radial and Meshed Distribution Networks

Line Parameter and Switching State Identification Method for...

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2023 International Conference on Smart Energy systems and Technologies, SEST 2023

作者： Matijasevic, Terezija Antic, Tomislav Capuder, Tomislav University of Zagreb Faculty of Electrical Engineering and Computing Department of Energy and Power Systems Zagreb Croatia

ISBN: (纸本)9798350397901

Current major changes in distribution systems require better monitoring from energy utilities to prevent possible issues in the form of deterioration of power quality and stability, voltage oscillations, and many others. However, distribution networks are still characterized by their limited observability, where information such as switching state and line parameters are not known. This constraint further complicates analyses concerning the observations of distribution networks. Therefore, this paper proposes a methodology that, as an answer to these problems, offers machine learning-based algorithms that aim to determine the switching state and line parameters of distribution networks using only collected historical Advanced Metering Infrastructure (AMI) measurements. This model was tested on the radial IEEE 33-bus benchmark system and both meshed and radial real-world distribution networks. The results demonstrate that the proposed method can provide an accurate estimation of line parameters and network topology relying only on voltage magnitudes and active and reactive power measurements. © 2023 IEEE.

关键词： power quality

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Pricing Binary Variables of system-wide Constraints for power system Optimization

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CSEE Journal of power and Energy systems 2024年第3期10卷 1131-1144页

作者： Jiaxun Li Wei Lin Zhifang Yang Mikhail Davidson State Key Laboratory of Power Transmission Equipment and System Security and New Technology College of Electrical EngineeringChongqing UniversityChongqing 400030China Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong Kong SAR 999077China Faculty of Computational Mathematics and Cybernetics Moscow State UniversityMoscow 119991Russia IEEE

With the trend of multiple energies or flexible demand in power systems,binary variables appear in systemwide constraints,which are the foundation of marginal pricing currently in *** appropriate pricing method incentivizes compliance of market participants;otherwise,compliance can be incentivized by paying discriminatory uplift payments which jeopardize transparency of *** paper proposes two theorems to examine whether the binary variables brought by multiple energies and flexible demand will impact compliance under marginal *** first theorem shows sufficient conditions with which marginal pricing with fixed binary variables incentivizes compliance,while the second theorem shows sufficient conditions to require uplift *** improve transparency by reducing uplift payments under cases which fall into the second theorem,this paper further proposes a pricing method by combining 1)designed constraints to price binary variables in system-wide constraints,and 2)convex hull pricing to price binary variables in private *** of the proposed theorems and pricing method is verified in an electricity-gas case(consisting of the IEEE 30-bus system and the NGS 10-node system)and the IEEE 118-bus test system.

关键词： Binary variables impact analysis pricing under non-convexities

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House heating system thermal dynamics assessment using Petri Net approach 10

House heating system thermal dynamics assessment using Petri...

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10th International Conference on Modern power systems, MPS 2023

作者： Beniugǎ, Oana Beniugǎ, Rǎzvan Bǎiceanu, Florin Technical University Gheorghe Asachi of Iasi Electrical Engineering Faculty Power System Department Iasi Romania

ISBN: (纸本)9798350326826

Energy efficiency is important as a way towards achieving energy savings and lowering harmful greenhouse gas emissions, and it also opens opportunities for employment and growth for new areas of activity boosting investment. Residential buildings have an important share in the energy used for different activities. As most of the energy used in residential buildings is aimed for space heating, the heating system must be assessed in terms of energy efficiency related to low heat losses. The paper proposed a Petri Net approach for modelling and simulating the dynamics of thermal heating system of a house in order to reduce the energy consumption based on appropriated heating system behavior. © 2023 IEEE.

关键词： Energy efficiency

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Collective Citizen Energy Investment Models for Solar power: Case Study Croatia

Collective Citizen Energy Investment Models for Solar Power:...

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2023 International Conference on Future Energy Solutions, FES 2023

作者： Herenčić, Lin Capuder, Tomislav Kirac, Mislav Čačić, Goran University of Zagreb Faculty of Electrical Engineering and Computing Department of Energy and Power Systems Zagreb Croatia Zagreb Croatia

ISBN: (纸本)9798350332308

Cost-competitiveness of decentralized renewable energy sources (RESs) has opened opportunities for citizens' ownership of RES and for the development of new business models. Citizen energy investment models based on cooperative principles have gained increased attention lately due to promises to support local economic welfare, boost local economy, increase social cohesion, help in grid optimization, and increase citizens' support for new RES projects. In this paper, we provide an overview of collective citizen energy investment concepts and describe the six types of models being developed in Croatia. We provide an overview of the initiatives together with the challenges, threats, and opportunities found when concepts are faced with the real-life practice in Croatia. We show that even though citizens' ownership of RES (mainly individual solar PV systems) is strongly increasing, the current developments of collective (group) citizen energy investment models are predominantly related to sporadic research projects and enthusiasts' initiatives, meaning still no wider-scope investments in RES have been conducted this way. Following the findings, we provide recommendations for removing the barriers and speeding up the development of such projects in the future. © 2023 IEEE.

关键词： Solar energy

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Key Issues for Modelling, Operation, Management and Diagnosis of Lithium Batteries: Current States and Prospects

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Energy engineering 2024年第8期121卷 2085-2091页

作者： Bo Yang Yucun Qian Jianzhong Xu Yaxing Ren Yixuan Chen Faculty of Electric Power Engineering Kunming University of Science and TechnologyKunming650500China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing102206China School of Engineering University of LincolnLincolnLN67TSUK Department of Electrical and Electronic Engineering The University of Hong KongHong Kong999077China

1 *** the continuous growth of the global population,the energy demand continues to ***,due to the dominance of fossil fuels in global energy and fossil fuels are non-renewable,it has led to the global energy crisis[1].Besides,the use of fossil fuels will generate a mass of air pollutants(e.g.,carbon dioxide,sulfur dioxide,etc.),which will cause serious environmental pollution,climate change[2],*** resolve the aforementioned issues,countries around the world have implemented a variety of measures hoping to fundamentally adjust the global energy structure and achieve sustainable ***,“Paris Agreement”reached in 2015 under the framework of“United Nations Framework Convention on Climate Change”aims to control the increase in the average temperature of the globe to within 2°C below preindustrial levels,and thereafter to peak global greenhouse gas emissions as soon as possible,continuously decreasing thereafter[3].United Kingdom plans to reduce the average exhaust emissions of“new cars”to approximately 50–70 g/km by 20230,which is roughly half of what it is now[4].In addition,China proposed a plan at“United Nations General Assembly”in 2020 to peak carbon dioxide emissions by 2030 and strive to achieve carbon neutrality by *** is a fact that the whole world is committed to changing the current energy structure,protecting the Earth’s ecology,and achieving global sustainable development[5].

关键词： Lithium batteries optimization operation modelling state estimation life prediction fault diagnosis

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A MLP-Mixer and mixture of expert model for remaining useful life prediction of lithium-ion batteries

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Frontiers of Computer Science 2024年第5期18卷 1-10页

作者： Lingling ZHAO Shitao SONG Pengyan WANG Chunyu WANG Junjie WANG Maozu GUO Faculty of Computing Harbin Institute of TechnologyHarbin 150001China School of Electrical Engineering Liaoning University of TechnologyJinzhou 121004China School of Computer Science Northeast Electric Power UniversityJilin 132000China Department of Medical Informatics School of Biomedical Engineering and InformaticsNanjing Medical UniversityNanjing 211166China School of Electrical and Information Engineering Beijing University of Civil Engineering and ArchitectureBeijing 100044China

Accurately predicting the Remaining Useful Life(RUL)of lithium-ion batteries is crucial for battery management *** learning-based methods have been shown to be effective in predicting RUL by leveraging battery capacity time series ***,the representation learning of features such as long-distance sequence dependencies and mutations in capacity time series still needs to be *** address this challenge,this paper proposes a novel deep learning model,the MLP-Mixer and Mixture of Expert(MMMe)model,for RUL *** MMMe model leverages the Gated Recurrent Unit and Multi-Head Attention mechanism to encode the sequential data of battery capacity to capture the temporal features and a re-zero MLP-Mixer model to capture the high-level ***,we devise an ensemble predictor based on a Mixture-of-Experts(MoE)architecture to generate reliable RUL *** experimental results on public datasets demonstrate that our proposed model significantly outperforms other existing methods,providing more reliable and precise RUL predictions while also accurately tracking the capacity degradation *** code and dataset are available at the website of github.

关键词： lithium-ion battery remaining useful life deep learning MLP-Mixer mixture-of-experts

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Complementary Reflectance and Carbon Dots Fluorescence Imaging Using Endoscopic Scanner 16

Complementary Reflectance and Carbon Dots Fluorescence Imagi...

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16th International Conference on Information Technology and electrical engineering, ICITEE 2024

作者： Leong, Yang Sing Bakar, Mohd Hafiz Abu Mokhtar, Mohd Hadri Hafiz Arsad, Norhana Zan, Mohd Saiful Dzulkefly Bakar, Ahmad Ashrif A. Universiti Kebangsaan Malaysia Faculty of Engineering and Built Environment Department of Electrical Electronic and System Engineering Bangi Malaysia Universiti Tenaga Nasional Institute of Power Engineering Kajang Malaysia

ISBN: (纸本)9798350375817

Endoscopic imaging plays a crucial role in biomedical research, offering insights into biological structures and chemical processes. In this study, we present a fibre pair cantilever-based endoscopic scanner capable of employing confocal reflectance and carbon dots-based fluorescence imaging. Fluorescent microspheres were used to verify the fluorescence detection capability of the proposed scanner. Subsequently, a carbon dots-labelled sample was imaged and analysed. The results show that the confocal reflectance images capture the surface profile of the sample while the fluorescence images detect the emitted fluorescence signals. The findings show the complementary strength between confocal reflectance and carbon-dots based fluorescence modalities for precise localisation of fluorescence signals within the sample. The proposed endoscopic scanner shows the potential of multimodal endoscopic imaging for advancing biomedical research. © 2024 IEEE.

关键词： Fluorescence imaging

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Optimization of power Supply system of Motorway Energy Consumers through Reliability Analyses

Optimization of Power Supply System of Motorway Energy Consu...

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2023 International Conference on electrical, Computer, Communications and Mechatronics engineering, ICECCME 2023

作者： Pašalić, Fuad Batalović, Mirza Smaka, Senad Berberović, Sead Matoruga, Mirza Int Bh Sarajevo Design and Development Department Sarajevo Bosnia and Herzegovina Faculty of Electrical Engineering Department of Electrical Power Engineering Sarajevo Bosnia and Herzegovina Faculty of Electrical Engineering and Computing Department of Electrical Engineering Fundamentals and Measurements Zagreb Croatia Elektroprenos - Elektroprijenos BiH Sector for Power Lines Sarajevo Bosnia and Herzegovina

ISBN: (纸本)9798350322972

This paper presents assessment of selected concept of medium voltage (MV) and low voltage (LV) power supply system of motorway energy consumers/systems on the Pan-European motorway corridor, branch Vc, in Bosnia and Herzegovina (BiH) through methods of reliability analyses. Assessment of selected concept is performed through comparison with different, enhanced and reduced, possible MV network and MV/LV transformer substation configurations. Comparison and analysis of different configurations have been made using of serial, parallel, serial-parallel and delta-star reliability model and Fault tree model. Objective was to confirm that selected concept offers optimized technical solution which provides reliable power supply, failure rate of the supply system as low as possible, together with relative simplicity of design. The results from the selected approach of reliability analyses indicate that this power supply concept entirely based on direct power supply from the primary transformer stations 110/x kV, which ensures two-sided MV power supply of MV/LV transformer substations and their redundant configuration provides reliable power supply of motorway consumers. © 2023 IEEE.

关键词： Stars

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