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IEEE PES GTD Grand International Conference and Exposition Asia (GTD Asia)

作者： Lejla Pašić Azra Pašić Alija Pašić István Vokony József Bíró Faculty of Electrical Engineering and Informatics Budapest University of Technology and Economics Budapest Hungary Department of Telecommunications and Media Informatics Budapest Hungary ELKH-BME Information Systems Research Group Budapest Hungary Department of Electric Power Engineering Budapest Hungary

Distribution system state estimation is becoming an increasingly important feature in the modern power grid, but the lack of real measurements makes its implementation particularly difficult. A solution for this problem could be the implementation of Artificial Neural Networks for direct distribution system state estimation. In our work, we created an ANN-based distribution system state estimation which can function based on sparse data, the accuracy of the ANN-based state estimation can be further improved utilizing a separated distribution system state estimation (S-ANN), which estimates the state of the network separately according to measurement type based on the same input data. With this method, the root mean square error and standard deviation of the state estimation can be significantly decreased.

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The influence of phosphogypsum microstructure on the main properties of press-formed samples 19th

The influence of phosphogypsum microstructure on the main pr...

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19th International Conference on Silicate Binders, ICBM 2020

作者： Fornés, Ignacio Villalón Vaičiukynienė, Danutė Doroševas, Viktoras Nizevičienė, Dalia Building Materials and Structures Research Centre Faculty of Civil Engineering and Architecture Kaunas University of Technology Studentu st. 48 KaunasLT-51367 Lithuania Department of Electrical Power Systems Faculty of Electrical and Electronics Engineering Kaunas University of Technology Studentu st. 48 KaunasLT-51367 Lithuania

ISBN: (纸本)9783035718706

The storage of the phosphogypsum in stockpiles causes serious environmental problems. In order to avoid them, this by-product should be utilised. Hence, one solution is to employ it as a binding material, so that its structural and binding properties must be satisfactory. Depending on the type of original phosphate rock, the microstructure of phosphogypsum may differ, determining its main physical-mechanical properties. However, research with comparative analyses of the properties of phosphogypsum from different origins is almost inexistent. Therefore, in this study, the microstructure of phosphogypsum from two different sources is analysed: the first type is from Kovdor mine (Russia);the second is a mixture between material from Kirov (Russia) and Casablanca (Morocco) mines. The microstructure of both phosphogypsum types was analysed and compared by applying SEM-DES analysis and by measuring the loss on ignition. In order to obtain high mechanical properties, the material was processed by press-forming. Eventually, the mechanical properties of hardened phosphogypsum of both types were obtained by compression test and then compared. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Microstructure

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An Improved Equilibrium Optimization Algorithm for Optimal Siting and Size of Electric Vehicle Charging Stations in Distribution Networks

An Improved Equilibrium Optimization Algorithm for Optimal S...

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International electrical engineering Congress (iEECON)

作者： Thien Vo Minh Tien Doan Thi Kieu Hoang Diep Chan Hau Nguyen Van Nguyen Tran Anh Dieu Vo Ngoc Department of Power Systems Faculty of Electrical and Electronics Ho Chi Minh City University of Technology (HCMUT) Ho Chi Minh Vietnam Department of Electrical - Electronic - Telecommunication Research Space for New Energy Development Can Tho University of Technology (CTUT) Can Tho Vietnam Department of Electrical Engineering College of Enginerrging Tchnology Can Tho University (CTU) Can Tho Vietnam

ISBN: (数字)9798331543952

ISBN: (纸本)9798331543969

The development of infrastructure for Electric Vehicle Charging Stations (EVCS) is is necessary to meet the rapidly increasing demand for Electric Vehicles (EVs). At the same time, it is essential to ensure stable operation of the power system, address complex challenges, and optimize the use of renewable energy, particularly to bring economic efficiency to investors. In this study, we proposed a framework for identifying optimal placement strategies and capacity of EVCS, incorporating Vehicle to Grid (V2G) technology in a distribution power system with integrated Distributed Generation (DG) with the multi-objective functions include minimizing power losses and optimizing the installation cost of EVCS. An improved Chaotic Equilibrium Optimization (CEO) base on original Equilibrium Optimizer (EO) algorithm was proposed to enhance solution search efficiency, and the standard IEEE 34 bus power network is selected as the simulation platform for testing. The simulation results, conducted in MATLAB and compared with previous studies, demonstrate the effectiveness of the CEO algorithm as well as the proposed problems for optimal EVCS placement.

关键词： Vehicle-to-grid Renewable energy sources Costs Simulation Transportation Distribution networks Electric vehicle charging power systems Standards Testing

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Finite-Set Model Predictive Control for 17-Level Inverter with Reduced Number of Iterations in Photovoltaic Applications

Finite-Set Model Predictive Control for 17-Level Inverter wi...

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Workshop on Predictive Control of electrical Drives and power Electronics (PRECEDE)

作者： Mohamed Abdelrahem Ibrahim Harbi Mostafa Ahmed M. Saad Bin Arif Ralph Kennel Jose Rodriguez Dept. of Electrical Engineering Assiut University Assiut Egypt Chair of High-Power Converter Systems Technical University of Munich Munich Germany College of Engineering and Technology Aligarh Muslim University Aligarh India Faculty of Engineering Universidad San Sebastiáan Santiago Chile

Finite-set model predictive control (FS-MPC) algorithms provide excellent dynamic performance for the power electronics converters with the ability to easily include any non-linearities and constraints. However, the high number of iterations required for prediction and cost function evaluation, especially for multi-level converters, hampers the implementation of the FS-MPC techniques. In this paper, firstly, the deadbeat concept is utilized to directly obtain the reference voltage vector. Accordingly, the iterations required for prediction are eliminated. Secondly, the number of iterations for cost function evaluation is also reduced by selecting a certain number of voltage vectors based on the value of the reference voltage vector. Finally, experimental results using hardware in the loop (HIL) technology are given to validate the proposed FS-MPC technique.

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

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

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International Colloquium on Smart Grid Metrology (SmaGriMet)

作者： Katarina Musulin Božidar Filipović-Grčić Viktor Milardić Mario Jurić Robert Teči Bruno Jurišić Ravel Ltd. Zagreb Croatia Department of Energy and Power Systems Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia Croatian Transmission System Operator Plc. Transmission Area Zagreb Zagreb Croatia KONČAR-Electrical Engineering Institute Ltd. Zagreb Croatia

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.

关键词： Voltage measurement Grounding Switchgear Switches High-voltage techniques Cable insulation Gas insulation

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Backward Radiation Reduction and Bandwidth Enhancement of Metamaterial Antenna for UWB Applications

Backward Radiation Reduction and Bandwidth Enhancement of Me...

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2021 Emerging Technology in Computing, Communication and Electronics, ETCCE 2021

作者： Uddin, M. Jasim Ullah, M. Habib Bentley, Barry L. Shakib, M.N. Islam, Syed Zahurul Rahman, Md Arafatur Cardiff Metropolitan University Cardiff School of Technologies Department of Applied Computing and Engineering United Kingdom University of Malaya Faculty of Engineering Department of Electrical Engineering Kuala Lumpur50603 Malaysia Cardiff Metropolitan University Cardiff School of Technologies Department of Computer Science United Kingdom Green University of Bangladesh Faculty of Science and Engineering Dept. of Electrical and Electronics Engineering Dhaka1207 Bangladesh University Tun Hussein Onn Malaysia Faculty of Electrical and Electronic Engineering Power Integration Systems Johor Malaysia Faculty of Science and Engineering University of Wolverhampton United Kingdom

ISBN: (纸本)9781665483643

A metamaterial inspired planar-patterned microstrip patch antenna, feeding on a Duroid substrate inset bottom ground soft-surface, is presented for ultra-wide band (UWB) applications. The present antenna is configured on a step-edge periodic unit-cell pattern, with a tiny air gap etched on the metal patch and finite ground plane. By employing these structures an ultra-wide band from 4 GHz ~ 16.2 GHz is achieved. The important advantage is retaining the suppression of back radiation while removing grounded edge metallic parts and replacing them with the finite cut-off square unit cell. The feeding ground plane and radiating patch are specially configured to develop artificial structures using series capacitance and shunt inductance. The efficiency of the proposed antenna is above 99.1%. To enhance gain and bandwidth, this antenna has etched Jerusalem crossed slots on the ground plane and star-slots on the patch, with the enhanced gain reaching a maximum of 8 dBi at 9.2 GHz. The antenna's overall dimensions exhibit 0.72λ × 0.83λ × 0.05λ at a 10.1 GHz cut-off frequency. The high absorption gain, directivity, and enhanced frequency bandwidth, verified by numerical modeling and experimentation, ensure the proposed antenna is well suited to any UWB application. © 2021 IEEE.

关键词： Metamaterial antennas

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Bidirectional EV charger integration into LV DC traction grid

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

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Compatibility in power Electronics (CPE)

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

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.

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A fast and effective maximum power point tracking method under various weather conditions for grid-connected photovoltaic systems

A fast and effective maximum power point tracking method und...

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IEEE Conference on power Electronics and Renewable Energy (CPERE)

作者： Karam Khairullah Mohammed Saad Mekhilef Muhyaddin Rawa Control and Mechatronics Engineering Department School of Electrical Engineering Universiti Teknologi Malaysia Johor Bahru Malaysia School of Software and Electrical Engineering Faculty of Science Engineering and Technology Swinburne University of Technology Hawthorn VIC Australia Smart Grids Research Group Center of Research Excellence in Renewable Energy and power Systems King Abdulaziz University Jeddah Saudi Arabia Department Of Electrical and computer Engineering Faculty of engineering K. A Care Energy Research and Innovation Center King Abdulaziz University Jeddah Saudi Arabia

Photovoltaic systems (PV) are exposed to various weather conditions during the day and getting the maximum power of a PV system is one of its major challenges. While the conventional methods take time to track the maximum power accompanying the fluctuation around the maximum power. Consequently, several metaheuristic algorithms have been presented to overcome the fluctuating around the maximum power. On the other hand optimization methods will search into entire the PV curve to extract the maximum power. This leads to unnecessary search points during the uniform shading conditions which decrease the convergence speed towards the maximum power. In overcoming the tracking time issues as well as the capacity to distinguish between uniform and partial shading conditions, a quick and efficient tracking technique connected to the grid system was presented in this paper. The proposed system, has been tested using MATLAB/SIMULINK, which includes a boost converter to track the maximum power with a sampling time of 0.05 seconds, While a voltage source converter (VSC) is used to transfer the power generated by solar panels to the grid. The simulation results demonstrated that the proposed method was successfully implemented, with an average tracking time of 0.412 s for different weather conditions. Moreover, the comparison with the conventional method of perturb and observe (P& O) has been presented to evaluate the proposed method’s efficiency.

关键词： Maximum power point trackers Renewable energy sources Fluctuations Simulation Optimization methods power electronics Solar panels

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State Estimation for Integrated Energy systems: Motivations, Advances, and Future Work

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IEEE Transactions on power systems 2024年

作者： Zhao, Junbo Srivastava, Ankur Guo, Ye Cetenovic, Dragan Lin, Yuzhang Levi, Victor Yin, Guanxiong Huang, Manyun Zhang, Tingting Li, Zhigang Chen, Yanbo Exposito, Antonio G. Zhang, Wen Zheng, Weiye Chakrabarti, Saikat Li, Yang Sharma, Ankush Kamwa, Innocent Guo, Qinglai Terzija, Vladimir Mili, Lamine University of Connecticut Department of Electrical and Computer Engineering StorrsCT06269 United States Tsinghua University Tsinghua-Berkeley Shenzhen Institute Shenzhen518055 China The University of Manchester Department of Eee ManchesterM13 9PL United Kingdom University of Kragujevac Faculty of Technical Sciences Čačak Čačak32000 Serbia New York University Department of Electrical and Computer Engineering NY11201 United States Tsinghua University Department of Electrical Engineering Beijing100084 China Hohai University College of Energy and Electrical Engineering Nanjing210098 China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan250061 China The Chinese University of Hong Kong-Shenzhen School of Science and Engineering Shenzhen518172 China North China Electric Power University School of Electrical and Electronic Engineering Beijing102206 China University of Sevilla Spain Sevilla41092 Spain South China University of Technology School of Electrical Power Engineering Guangzhou510641 China Indian Institute of Technology Kanpur Department of Electrical Engineering Kanpur208016 India Northeast Electric Power University School of Electrical Engineering Jilin132012 China Laval University Department of Electrical and Computer Engineering QuebecQCG1V 0A6 Canada Tsinghua University State Key Laboratory of Power Systems Department of Electrical Engineering Beijing100084 China Newcastle University School of Engineering Newcastle upon TyneNE1 7RU United Kingdom Virginia Polytechnic Institute and State University Bradley Department of Electrical and Computer Engineering Falls ChurchVA22043 United States

This paper summarizes the technical activities of a three-year-long IEEE Task Force (TF) on State Estimation (SE) for Integrated Energy systems (IES). It presents the formal definition and characteristics of IES, along with the comprehensive discussion on Electric power systems (EPS) model, and static and dynamic models associated with heating and natural gas systems. The paper also identifies the barriers of SE for IES, such as estimation modeling, observability analysis, and measurement requirements, together with addressing multi-scale dynamics. An extensive comparative analysis between Integrated Energy systems-State Estimation (IES-SE) and more established Electric power System-State Estimation (EPS-SE) is presented. The paper also provides future research needs and directions related to IES-SE. © 1969-2012 IEEE.

关键词： power system analysis

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Evaluation of Inertial Response and Frequency Regulation in the Long-term Based on the Development Strategy of the Latvian power System

Evaluation of Inertial Response and Frequency Regulation in ...

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International Conference on Environment and electrical engineering (EEEIC)

作者： Inga Zicmane Svetlana Beryozkina Saulius Gudzius Audrius Jonaitis Sergey Kovalenko Gatis Junghans Jevgenijs Kuckovskis Faculty of Electrical and Environmental Engineering Riga Technical University Riga Latvia College of Engineering and Technology American University of the Middle East Kuwait Department of Electrical Power Systems Kaunas University of Technology Kaunas Lithuania JSC Augstsprieguma tikls (TSO) Riga Latvia Faculty of Electrical and Environmental Engineering Riga Latvia

ISBN: (数字)9781665485371

ISBN: (纸本)9781665485388

The balance of electricity consumption and frequency regulation is the main technical problem in power systems with a high share of renewable energy sources leading to reducing the network inertia. As a result, the same level of imbalance of electricity supply and demand will have a greater impact on the system frequency with low inertia rather than with high. In turn, the problem of the lack or absence of stored energy could become especially acute in the event of an emergency failure of large power plants, not allowing them to fill the lack of power quickly and temporarily. This work aims to study the problem of maintaining the balance of power and frequency within normal operating limits based on the example of a simplified model of the Latvian power system developed in the Siemens PSS/E environment. As a solution, the combined use of synchronous capacitors and energy storage devices (the latter as sources of synthetic inertia) is proposed in case of sudden power changes in generation or load. The frequency response of the power system model has been investigated for both current and future development scenarios considering a significant increase in the share of generation from wind farms as well as the expected energy synchronization of the Baltic States with the energy systems of continental Europe in 2025.

关键词： Wind energy generation Renewable energy sources Supply and demand Europe Wind power generation Wind farms power systems

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