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2022 International Conference on electrical, Computer, Communications and Mechatronics engineering, ICECCME 2022

作者： Jurčević, Jura Zoričić, Davor Dolinar, Denis Pavić, Ivan Čović, Nikolina University of Zagreb Faculty of Economics and Business Department of Managerial Economics Zagreb Croatia University of Zagreb Faculty of Electrical Engineering and Computing Department of Energy and Power Systems Zagreb Croatia

ISBN: (数字)9781665470957

ISBN: (纸本)9781665470957

Decarbonization efforts aimed at tackling the cli-mate change issues rely on increasing use of renewable energy sources (RES) in the power system. In order to maximise their integration, significantly higher rollout of the battery storage systems (BSS) is necessary, even in the EU which set ambitious goal of achieving carbon neutrality by 2050. EU goals will be difficult to realize without incentives to battery storage. In this paper direct subsidies reducing the installation cost of BSS are considered. We use German power market data for the 2017 and 2021: intraday prices, day-ahead prices and primary reserve markets in particular. Battery storage is integrated with photovoltaics (PV) in order to provide electricity to small and medium sized industrial plants. In this setup the multi- objective optimisation (MOO) method to optimise the annual BSS operation is applied and internal rate of return is used to assess profitability. Since the BSS cycle lifetime (determined by market conditions) often exceeds the calendar lifetime, a fall in the profitability occurs which is used to calculate the subsidy level. The results suggest that the obtained subsidy range is within the range reported in practice considering the perfect foresight assumption used in the analysis. Also, lower subsidies are obtained for 2021 due to conditions more favourable for BSS operation. © 2022 IEEE.

关键词： Multiobjective optimization

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The Influence of the Electric Vehicle Charging Station on the power Supply Network with Regard to power Quality

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Transportation Research Procedia 2023年 74卷 876-883页

作者： Pavel Stanko Michal Reguľa Alena Otčenášová Matej Tkáč Department of Power Systems and Electric Drives Faculty of Electrical Engineering University of Žilina Univerzitná 1 010 26 Žilina Slovakia

The European Union (EU) aims to reduce greenhouse gas emissions by 2030 and therefore a proposal has been accepted to improve publicly accessible charging and refueling infrastructure for alternative fuels. This will result in an increasing number of electric vehicles charging stations, which can negatively impact the power grid. Therefore, this paper investigates the impact of electric vehicle charging by a particular charging station on the grid from a power quality perspective. The charging station's harmonic components, reactive power, and power factor during different operating conditions are analyzed. The harmonic analysis for one period of supply voltage and current consumed by the charging station during maximum load, graphs of active power, reactive power, first harmonic power factor, and total power factor for different operating conditions are shown in this paper.

关键词： electric vehicle charging station power quality harmonics reactive power power factor

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electrical Grid Capability Evaluation in the Context of Prosumer Contribution Growth 17th

Electrical Grid Capability Evaluation in the Context of P...

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17th International Conference on Interdisciplinarity in engineering, INTER-ENG 2023

作者： Dumitru, Cristian-Dragoş Gligor, Adrian Gorea, Cristian Vlasa, Ilie Damian, Claudiu-Iosif Department of Electrical Engineering and Information Technology Faculty of Engineering and Information Technology "George Emil Palade" University of Medicine Pharmacy Science Târgu Mureş Romania Department of Electrical Power Systems Faculty of Energy Engineering University Politehnica of Bucharest Bucharest Romania Distribuție Energie Electrică Romania S.A. Str. Ilie Măcelaru nr. 28A Cluj-Napoca jud. Cluj Romania

ISBN: (纸本)9783031546709

In the context of the energy transition, the number of photovoltaic prosumers has increased significantly in recent years. This paper analyzes the evolution of prosumers from 100 in 2021, producing 0.02 GWh, to 1000 in 2023, generating 2.2 GWh, within a consistent electrical network. Through a detailed case study, we assess the capacity and limitations of the network in relation to the increased energy injection. The results highlight the current challenges of the network and estimate its adaptation potential in the face of emerging prosumer demands, having significant implications for the planning and optimization of future networks. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Electric loads

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Traction powered multiport DC-DC converter for bidirectional EV charging application – HIL simulation results

Traction powered multiport DC-DC converter for bidirectional...

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Compatibility in power Electronics (CPE)

作者： Mykola Lukianov Enrique Romero Cadaval Oleksandr Matiushkin Ryszard Strzelecki Faculty of Electrical and Control Engineering Gdańsk University of Technology Gdańsk Poland Power Electrical and Electronic Systems R+D Group University of Extremadura Badajoz Spain Department of Electrical Power Engineering and Mechatronics Tallinn University of Technology Tallinn Estonia Faculty of Electrical Engineering Gdynia Maritime University Gdynia Poland

ISBN: (数字)9798331515171

ISBN: (纸本)9798331515188

The limited availability of public electric vehicle (EV) charging infrastructure poses a significant challenge to EV adoption in urban areas. This underscores the need for cost-effective solutions that enable charging for a large number of EVs, particularly for multiterminal charging stations. One promising approach to reducing installation costs is the implementation of a current-fed multi-active bridge multiport converter, powered by existing DC traction infrastructure. The use of a multiport converter allows for sharing electric components between several ports, reducing total number of elements required, compared to conventional systems, where each EV charger relies on a separate converter. Additionally, connection to the DC traction grid enables sharing some of the substation equipment between the traction network and the EV charger, further lowering installation costs while providing additional benefits, such as DC grid voltage stabilization and transit transport braking energy recuperation. In the case studied in the paper, the use of the converter reduced catenary voltage drops by $10 \%$ and voltage surges by $30 \%$, compared to $\pm 35 \%$ in the base scenario (without a converter).

关键词： power engineering Costs Substations Hardware-in-the-loop simulation Urban areas Voltage DC-DC power converters Electric vehicle charging Traction power supplies Surges

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Flicker Visibility With Different Spectra of White Light

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IEEE Transactions on Industry Applications 2025年

作者： Kukacka, Leos Hergesel, Jan Necasek, Jakub Bilek, Petr Vik, Michal Stiegler, Robert Pourarab, Morteza Meyer, Jan Drapela, Jiri Technical University of Liberec Faculty of Mechatronics Informatics and Interdisciplinary Studies Institute-of Mechatronics and Computer Engineering Liberec Czech Republic Technical University of Liberec Faculty of Textile Engineering Department of Material Engineering Czech Republic Technische Universität Dresden Institute of Electrical Power Systems and High Voltage Engineering Chair of Electrical Power Supply Dresden01069 Germany Brno University of Technology Faculty of Electrical Engineering and Communications Brno61600 Czech Republic

The standard flickermeter (voltage flickermeter) algorithm commonly used for the evaluation of flicker severity in current electromagnetic compatibility standards originates from the 1980 s. It was developed to mimic irritation of an average human observer by flickering incandescent lamp as a reference light source and optimized to voltage fluctuations caused by arc furnaces. However, the algorithm is questionable as the situation in the grid changed since the 1980 s;many modern devices are being connected to the grid, creating voltage distortion patterns which are not properly recognized by the voltage flickermeter. In addition, incandescent lamps have been largely replaced by discharge lamps and later by LEDs. Transitioning the algorithm from incandescent lamp light to LED light requires detailed revision of every part of the algorithm. This paper is concerned with verifying the frequency weighting function of the average human observer which is one of the bases of the voltage flickermeter, as well as of the derived light flickermeter. Flicker sensitivity of 34 human observers is measured with two different light sources (LED warm and neutral white, incandescent lamp) and compared with the frequency weighting function used in the current specification of the flickermeters in standards. Finally, an optimization of the weighting function is proposed based on the findings. © 1972-2012 IEEE.

关键词： Flickering

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Assessment of the significance of features for the identification of domestic appliances

Assessment of the significance of features for the identific...

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27th International Conference on Electricity Distribution (CIRED 2023)

作者： L. Ma M. Schmidt P. Schegner Technische Universitaet Dresden Institute of Electrical Power Systems and High Voltage engineering Faculty of Electrical and Computer Engineering Dresden Germany

The load identification technologies in the domestic field, also called Non-Intrusive Load Monitoring (NILM), aim to break down the total electricity consumption at household level to the appliance level. This detailed information helps to identify the behaviour of users, deduce energy saving concepts, or provide live assistance for the residents. The NILM approaches are carried out with appliance features, such as the absorbed power, the voltage and current profile. They are defined as appliance-specific characteristics or features, which supposed to make the appliance clearly distinguishable from others. However, most of the publications focus on the identification algorithms. There is barely a contribution to analyse the significance of features. Hereby, the significance means, how consistent and reliable a feature differs from one appliance to another. This paper works on this question. Based on analyses of publications and own measurements, this paper gives an overview of the significance of representative features. Furthermore, suitable features for one-second data are selected and NILM is carried out.

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Quadratic Interpolation Optimization for Planning of Renewable Energy-based DG Units in power System Networks

Quadratic Interpolation Optimization for Planning of Renewab...

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International Middle-East power System Conference, MEPCON

作者： Mohammed S. M. Zewail Mohamed R. Elkadeem Mohamed M. M. Salama Diaa-Eldin A. Mansour Mohamed M. F. Darwish Department of Electrical Engineering Faculty of Engineering at Shoubra Benha University Cairo Egypt Interdisciplinary Research Center for Sustainable Energy Systems (IRC-SES) KFUPM Saudi Arabia Department of Electrical Power and Machines Engineering Faculty of Engineering Tanta University Tanta Egypt Electrical Power Engineering Department Faculty of Engineering Egypt-Japan University of Science and Technology Alexandria Egypt

ISBN: (数字)9798350379648

ISBN: (纸本)9798350379655

Optimal planning of distributed generation (DG) units within power system networks PSN is crucial for improving the reliability and quality of power delivery. This involves optimizing the size and location of DGs, considering both technical and operational constraints. This study proposes the Quadratic Interpolation Optimization (QIO) method, a mathematically inspired meta-heuristic algorithm, for the optimal planning and allocation of renewable energy (RE)-based DG units. The optimization problem aims to enhance the voltage profile and stability index of the network, minimize power losses, and maximize investment profitability. The QIO algorithm utilizes the principle that any three points can define a quadratic function, efficiently identifying the minimizer of that function and overcoming the limitations of traditional quadratic interpolation methods. To validate the proposed algorithm, simulations were conducted on the standard IEEE 69-bus radial distribution system. Various scenarios were analyzed by varying the type and number of DG units to evaluate their impact on network performance. Compared to existing methods, the QIO demonstrates superior efficiency in optimizing the allocation and sizing of RE-based DG units, achieving faster convergence and reduced computational time.

关键词： Interpolation Renewable energy sources Metaheuristics Stability criteria Voltage power system stability Generators Planning Resource management Standards

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Measurements and Simulations of Very Fast Transients at the Connection of High Voltage Cable with Gas Insulated Metal Enclosed Switchgear 4

Measurements and Simulations of Very Fast Transients at the ...

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4th International Conference on Smart Grid Metrology, SMAGRIMET 2023

作者： Musulin, Katarina Filipovic-Grcic, Bozidar Milardic, Viktor Juric, Mario Teci, Robert Jurisic, Bruno Ravel Ltd. Zagreb Croatia University of Zagreb Faculty of Electrical Engineering and Computing Department of Energy and Power Systems Zagreb Croatia Croatian Transmission System Operator Plc. Transmission Area Zagreb Zagreb Croatia KONČAR-Electrical Engineering Institute Ltd. Zagreb Croatia

ISBN: (纸本)9798350323597

The transient enclosure voltage rise (TEVR) in GIS is caused by very fast overvoltages that occur inside the enclosure during the switching operation, mainly during disconnector operations. TEVR is caused by very high frequency overvoltages (the order of MHz), for which even small inductance of earthing leads can represent significant impedance. The level of TEVR strongly depends on design and length of the earthing leads. Therefore, overvoltage measurements were performed for different earthing leads configurations in 110 kV GIS and results are presented in this paper. The earthing leads configurations were first verified by simulation in the EMTP program. © 2023 IEEE.

关键词： Enclosures

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Bidirectional EV charger integration into LV DC traction grid 17

Bidirectional EV charger integration into LV DC traction gri...

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17th IEEE International Conference on Compatibility, power Electronics and power engineering, CPE-powerENG 2023

作者： Lukianov, Mykola Verbytskyi, Ievgen Cadaval, Enrique Romero Strzelecki, Ryszard Gdańsk University of Technology Faculty of Electrical and Control Engineering Gdańsk Poland National Technical University of Ukraine 'Igor Sikorsky Kyiv Polytechnic Institute' Dept. of Electronic Devices and Systems Kyiv Ukraine University of Extremadura Power Electrical and Electronic Systems R+D Group Badajoz Spain

ISBN: (纸本)9798350300048

Integration of bidirectional electric vehicle (EV) chargers into low voltage (LV) DC traction grids can potentially reduce chargers installation cost, as well as provide ancillary services for the DC grid, such as voltage stabilization, energy recuperation and reduced peak load. However, due to high LV DC grid voltage fluctuations and excessive load that EV chargers can create on a grid, their integration is challenging. In order to solve the problem, an EV charger connection scheme, converters parameters, as well as charger control algorithm must be considered wisely. This paper presents different connection solutions for bidirectional EV chargers integration into traction substations. A comparison of possible converter topologies that can be used in the system is made, depending on their efficiency, cost and applicability. Consequently, the system main parameters such as converters nominal power, voltage ratings and smart charging principle are presented. As a result, the proposed solution can be beneficial for developing EVs and public electric transport, which uses LV DC grids, such as trams/trolleybuses/metro. © 2023 IEEE.

关键词： Integration

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Study on Subsynchronous Resonance in Vietnam power System

Study on Subsynchronous Resonance in Vietnam Power System

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2023 International Symposium on electrical and Electronics engineering, ISEE 2023

作者： Nguyen, Nhat-Nam Nguyen, Manh-Toan Vu, Duc-Quang Vu, Phan-Tu Faculty of Electronics-Electrical Engineering Department of Power Systems Ho Chi Minh City70000 Viet Nam Thu Duc City70000 Viet Nam Power Engineering Consulting Joint Stock Company 2 Train Research and Develop Centre Ho Chi Minh City70000 Viet Nam

ISBN: (纸本)9798350315486

The SSR is a concerning issue in power systems that can lead to damaging consequences such as turbine-generator shaft damage and power system instability. The installation of series capacitors on transmission lines is a major factor contributing to SSR. Vietnam experienced an occurrence of SSR at the Vung Ang I thermal power plant on November 24th, 2015. As the country's renewable energy sector, particularly wind turbine generators, continues to expand rapidly, the severity of SSR to Vietnam power system is expected to increase. Recognizing the significant harms caused by SSR to power systems, this article focuses on studying this phenomenon in the power grid of Vietnam under two typical scenarios: 2020 and 2025. The research makes use the EMTP-RV tool to determine the frequency range that triggers SSR and identifies power plants at high risk of being affected. In addition, a viable solution for reducing SSR in the power system is proposed and validated. © 2023 IEEE.

关键词： Turbogenerators

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