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Mediterranean Electrotechnical Conference (MELECON)

作者： Sofia Varotto Vincenzo Trovato Ehsan Kazemi-Robati Bernardo Silva Dept. of Civil Environmental and Mechanical Engineering University of Trento Trento Italy Center of Power and Energy Systems INESC TEC Porto Portugal Faculty of Engineering University of Porto Porto Portugal Dept. of Electrical and Electronic Engineering Imperial College London London United Kingdom

ISBN: (数字)9798350387025

ISBN: (纸本)9798350387032

This paper investigates the financial benefits stemming from the potential installation of battery energy storage systems behind the meter of a hybrid offshore farm including wind turbines and floating photovoltaic panels. The optimal investment and operation decisions concerning the energy storage system in the hybrid site are assessed by means of a mixed integer linear programming optimization model. The operation is also subject to technical constraints such as limitations on the connection capacity and ramping constraints imposed by the grid operator at the point of common coupling. Three design configurations for the battery system are analysed: I) offshore with the hybrid farm, II) onshore where the grid connection point is, III) both offshore and onshore. The results indicate the financial value of installing battery storage units, and other benefits deriving from this investment, as the reduction of curtailment.

关键词： Photovoltaic systems Production systems Battery energy storage system Hybrid power systems Batteries Wind turbines Resource management

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A Comparative Study of Metaheuristic Optimization Algorithms for GMPP Tracking in Photovoltaic systems Under Partial Shading Conditions

A Comparative Study of Metaheuristic Optimization Algorithms...

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International Youth Conference on Radio Electronics, electrical and power engineering (REEPE)

作者： Salam J. Yaqoob Salah Kamel Francisco Jurado Naseer T. Alwan Mohamed A. Tolba Electrical Engineering Department University of Jaén Jaén Spain Electrical Engineering Department Faculty of Engineering Aswan University Aswan Egypt Department of Renewable Energy Techniques Engineering College of Oil & Gas Techniques Engineering / Kirkuk Northern Technical University Iraq Ural Federal University named after the first President of Russia B. N. Yekaterinburg Russia Reactors Department Nuclear Research Center Egyptian Atomic Energy Authority Cairo Egypt Electrical Power Systems Department Moscow Power Engineering Institute Moscow Russia

ISBN: (数字)9798331531836

ISBN: (纸本)9798331531843

In this paper, a comparative analysis of the most popular metaheuristic optimization algorithms used for maximum power point tracking (MPPT) in the case of partial shading conditions (PSC) is carried out. The algorithms include Particle Swarm Optimization (PSO), improved Grey Wolf Optimizer (IGWO), Firefly Algorithm (FA), Salp Swarm Algorithm (SSA) as well as Harris Hawks Optimization (HOA). Moreover, the solar photovoltaic (PV) system of 700W is used and it is linked with DC/DC boost converter for supplying a standalone load. The PSO, IGWO, FA, SSA, and HOA are conducted and validated under three patterns of irradiance for uniform and non-uniform irradiation conditions. The results of the uniform irradiance show that the PSO and HOA algorithms have high efficiencies of 95% and 95,2%, respectively. Moreover, the results under the complex PSC the FA, HOA, and IGWO presents good efficiencies which are the efficiency of the FA is 95 %, for the HOA method is 94.9%, and the efficiency of the IGWO is 90.6 %. The worst method under the complex PSC is the PSO method which is failed to track the GMPPT. Finally, from the simulation results under complex PSC, the effectiveness of PSO and HOA raises some concerns in terms of both convergence and stability, whereas IGWO and SSA yield fairly decent results, while the best algorithm is the FA which has more stable results under PSC.

关键词： Maximum power point trackers Photovoltaic systems Accuracy Heuristic algorithms Metaheuristics Stability analysis Trajectory Particle swarm optimization Oscillators Convergence

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Conductive EMI Attenuation of GaN-Based Bi-Directional Grid-Tie Inverter for Ultra-High-Speed PMSM Application

Conductive EMI Attenuation of GaN-Based Bi-Directional Grid-...

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Annual Conference of Industrial Electronics Society

作者： Tohid Asefi Ralph Kennel Majid Sanatkar Chayjani Alireza Davari Freddy Flores-Bahamonde Institute for High-Power Converter Systems Technical University of Munich Germany College of Engineering University of Tehran Tehran Iran Department of Electrical Engineering Shahid Rajaee Teacher Training University Tehran Iran Energy Transformation Center Faculty of Engineering Universidad Andrés Bello Chile

ISBN: (数字)9781665464543

ISBN: (纸本)9781665464550

The integration of WBG based high frequency inverters with ultra-high speed Permanent Magnet Synchronous Machines (PMSMs) presents unique challenges in managing Electromagnetic Interference (EMI), crucial for ensuring electromagnetic compatibility (EMC). This work presents the design and validation of EMI filters for a high frequency WBG-based bi-directional grid-tie inverter, specifically developed for ultra-high-speed PMSM applications. Without EMI filter, the inverter cannot meet the conducted emission limits in the relevant standards. By Utilizing the grid and machine side filters, the system complies within the strictest category 1 limits of IEC61800-3 for use in residential areas. Test results confirm that the new filter significantly enhances electromagnetic compatibility, reducing EMI below industry limits while maintaining inverter efficiency and dynamic response. The inverter developed and experiments conducted on ultra-high-speed 180,000 rpm, 3 kW, with 400V DC link developed on both SiC and GaN switching at 100kHz. The work’s outcomes not only further the integration of high-speed PMSMs into smart grids but also pave the way for future innovations in power electronics design. This work is expected to facilitate the wider adoption of WBG technology in critical energy infrastructure.

关键词： power system measurements Filters Costs Silicon carbide Electromagnetic interference Noise Bidirectional control Motors Electromagnetic compatibility Inverters

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Biomass-Derived Activated Porous Carbon from Kenaf Fiber for High Energy Symmetric Supercapacitors

SSRN

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SSRN 2024年

作者： Ahmad Noorden, Zulkarnain Abdul Razak, Muhammad Nizam Ani, Farid Nasir Abdul-Malek, Zulkurnain Abd Wahid, Siti Aisyah Jamian, Jasrul Jamani Institute of High Voltage and High Current Universiti Teknologi Malaysia Johor Johor Bahru81310 UTM Malaysia Faculty of Mechanical Engineering Universiti Teknologi Malaysia Johor Johor Bahru81310 UTM Malaysia Department of Electrical Power Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia Johor Johor Bahru81310 UTM Malaysia Centre of Electrical Energy Systems Universiti Teknologi Malaysia Johor Johor Bahru81310 UTM Malaysia

This paper presents the development of biomass-derived carbon from kenaf fiber using a simple pre-carbonization process with combination of potassium hydroxide (KOH) activation. The kenaf fiber activated carbon (KFAC) is activated at four different temperatures of 600, 700, 800, and 900 °C and at a fixed time interval of 3 hours. The results show that the kenaf fiber activated at 700 °C has the highest specific capacitance of 136 Fg-1 at a supply current of 5 mA. The results also show that the KFAC-600, KFAC-800, and KFAC-900 electrodes has outstanding specific capacitance, with a value of 109, 94, and 31 Fg-1, respectively. The outstanding charge storage capabilities of the KFAC electrodes are attributed to their large specific surface area, high proportion of micropores, mesopores, and macropores, as well as appropriate pore size. These results verify the potential of KFAC for high-performance supercapacitors. Since kenaf biomass is inexpensive, eco-friendly, abundant source and the synthesis of KFAC is simple, it is practical to industrialize KFAC for scaled-up production of high-energy supercapacitors. © 2024, The Authors. All rights reserved.

关键词： Supercapacitor

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A Grid-Connected PV System Based on Z-source Inverter with Maximum power Extraction 6

A Grid-Connected PV System Based on Z-source Inverter with M...

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6th IEEE International Conference on Computing, Communication and Automation, ICCCA 2021

作者： Al Essawy, Ihab Jamal Elmorshedy, Mahmoud F. Dabour, Sherif M. Rashad, Essam M. Islam, Md Rabiul Tawam United Electromechanical Enterprises Company Abu Dhabi United Arab Emirates Tanta University Faculty of Engineering Department of Electrical Power Systems and Machines Egypt School of Electrical Computer and Telecommunications Engineering University of Wollongong NSW2522 Australia

ISBN: (纸本)9781665414739

The research introduces a Z-source inverter (ZSI) as an interface for a grid-connected Photovoltaic (PV) system. The ZSI performs both boosting and inversion processes in a single stage to diminish the overall system bulk volume, and cost. The proposed control technique of the entire system aims to stabilize the inverter's input voltage and controls the power injected to the grid. The system also implements maximum power point tracking (MPPT) in addition to transferring it to the grid with a unity power factor. Two independent control variables are used to decouple the control of the DC and AC sides of the ZSI. These variables are the shoot-through (ST) duty cycle and inverter modulation index. Output results of simulation are carried out to check the effectiveness of the suggested control techniques and their capability to elicit the ultimate power while regulating the DC-link voltage and achieving unity power factor process. © 2021 IEEE.

关键词： Electric inverters

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Study on the Method of Increasing PV Efficiency for power Supply at Space Stations

Study on the Method of Increasing PV Efficiency for Power Su...

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International Russian Automation Conference (RusAutoCon)

作者： Nikolay Mestnikov Ahmad Alzakkar Yuri Samofalov Institute of Physical and Technical Problems of North SB RAS North-Eastern Federal University Yakutsk Russia Faculty of Mechanical and Electrical Engineering Albaath University Homs Syria Institute of Electric Power Systems and Network Kazan State Power Engineering University Kazan Russia

The power supply of space stations and satellites is carried out through using double-sided photovoltaic panels with efficiency 25% to 30%. It is known that a solar power plant has significant weight characteristics (45 kg to 50 kg per 1 kW). The cost of delivering 1 kg of payload to the space station is 20000$ to 22000$. In this regard, reducing the weight of a solar power plant designed to supply space stations has a significant demand and can be implemented by increasing the power efficiency of photovoltaic panels (PV). The purpose of article is to study a method for improving the electrical power efficiency of photovoltaic panels for the power supply of space stations. In this study was used, the main electrical power regularities in the field of solar power and statistical data processing methods. In the result of the study, were obtained the dependences of the production of photovoltaic panels on solar radiation. In addition, it has been determined the parameters for assessing the operating modes of a solar power plant and the effect of introducing the proposed method on the technical and economic parameters of the facility.

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Parameter Study for Oil Spray Cooling on Endwindings of Electric Machines Via Eulerian-Lagrangian Simulation

SSRN

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SSRN 2023年

作者： Zhao, An Duwig, Christophe Liu, Chuan Gerada, David Leksell, Mats Department of Electrical Power and Energy Systems KTH Royal Institute of Technology Stockholm Sweden Department of Chemical Engineering KTH Royal Institute of Technology Stockholm Sweden Faculty of Engineering University of Nottingham Nottingham United Kingdom

Electrification of transport is a key for reaching decarbonization of society. The power traction motors used in them usually have large power and torque density, which calls for advanced thermal management. In particular, risks of overheating should be avoided to prevent dramatic shortening the lifespan of the stator windings. Such demand puts forward the requirement for active cooling methods of electric machines. Spray cooling is a promising and efficient direct liquid cooling technology that has been proved in previous research to possess high heat removal capability. This paper investigates the heat transfer characteristics of spray cooling on endwindings of electric machines via the CFD simulation with an Eulerian-Lagrangian approach. Decreasing the stream numbers for the spray injector and only solving the energy equation for the air after its flow field reaches a steady-state can reduce the computational cost without compromising the predicting accuracy. The effects of splashing, secondary breakup of the spray droplets, heat conduction in the endwindings, and the Saffman lift force are investigated and found to be minor leading to small changes in the prediction of heat transfer coefficients. Parameter analyses are also conducted for operating conditions and the configuration of spray nozzles. It is found that a larger flow rate, a smaller droplet size, a lower distance between nozzles and endwindings, and more nozzle numbers tend to increase the overall heat transfer performance. It opens avenue for optimizing direct spray cooling with gain in operation and lifetime of electric machines. © 2023, The Authors. All rights reserved.

关键词： Cooling

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The Impact of Introducing Solar Radiation Concentration System for Solar power Plants Under Conditions of the Russian Far North

The Impact of Introducing Solar Radiation Concentration Syst...

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International Russian Automation Conference (RusAutoCon)

The article is devoted to study the impact of introducing a solar radiation concentration system, consisting of Fresnel lenses, for solar power plants. The paper applies the requirements for the implementation of full-scale research in solar power facilities according the theory of experimental research. Methods for processing experimental data were used by calculating the average statistical indicators of the generating capacity of a solar power plant. Field studies were carried out in the central part of the Republic of Sakha (Yakutia) during February-March. The purpose of the study is to identify the nature of the impact of the solar radiation concentration system on the generation of electricity from a solar power plant in the winter-spring period of operation. It has been established that when using this system, the generation of electricity from a solar power plant increases by 16-17%, provided there are no factors that reduce the intensity of solar radiation. The results of study can be applied in order to improve the electric power efficiency of solar power facilities in of the Russian Far North.

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Plug-in electric vehicles demand modeling in smart grids: A deep learning-based approach: Wip abstract 21

Plug-in electric vehicles demand modeling in smart grids: A ...

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12th ACM/IEEE International Conference on Cyber-Physical systems, ICCPS 2021, part of CPS-IoT Week 2021

作者： Jahangir, Hamidreza Konstantinou, Charalambos Faculty of Electrical Engineering K.N.Toosi University of Technology Tehran Iran Center for Advanced Power Systems Florida State University TallahasseeFL United States

ISBN: (纸本)9781450383530

In smart grids, Plug-in Electric Vehicles (PEVs) are considered components of the power demand. PEVs have highly stochastic behavior, and to manage this stochastic load efficiently, intermediary bodies, widely known as aggregators, have been developed in the literature. In order to handle the PEVs charging demand from both technical and financial points of view, aggregators include tools based on Internet-of-Things (IoT) technology, which can observe the users' historical behavior and estimate their travel behavior and the requested charging demand. In the near future, the increase in the share of PEV adoption will transform the PEVs demand modeling framework into a "big-data"Cyber-Physical System (CPS). We present a novel artificial intelligence approach based on the deep learning concept to tackle this large dimension problem. To investigate users' different behavior, the PEVs are classified into different groups based on their driving patterns. Then, each class is assigned to its respective deep convolutional neural networks. The proposed method's performance will be investigated in the day-ahead energy market. © 2021 ACM.

关键词： Internet of things

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CURRENT SOURCE RECTIFIER FOR HIGH-power WATER ELECTROLYSERS: ANALYSIS AND SIZING 13

CURRENT SOURCE RECTIFIER FOR HIGH-POWER WATER ELECTROLYSERS:...

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13th International Conference on power Electronics, Machines and Drives, PEMD 2024

作者： Iribarren, Álvaro Barrios, Ernesto L. Balda, Julián Rivera, Marco Wheeler, Patrick Ursúa, Alfredo Sanchis, Pablo Edificio de los Pinos Campus Arrosadia s/n Pamplona31006 Spain Research Group Department of Electrical and Electronic Engineering Faculty of Engineering University of Nottingham NottinghamNG7 2RD United Kingdom Department of Solar PV Systems – Solar PV BESS & Green H2 Ingeteam Power Technology S.A. – Energy Sarriguren31621 Spain Dirección de Investigación Universidad de Talca Merced 437 Curicó3341717 Chile

Current source rectifiers offer advantageous features that make them attractive solutions for powering grid-connected high-power electrolysers. Being a single-stage step-down rectifier topology is particularly well-suited for the low voltage, high current characteristics of high-power electrolysers. This paper investigates the impact of electrolyser electrical behaviour on the operation of current source rectifiers and provides practical guidelines for their optimal sizing, aiming to enhance power quality while minimizing overall system costs. Requirements for both grid and electrolyser sides are defined, and key considerations for sizing converter elements such as semiconductors, input LC filter, output dc inductance, and power transformer are discussed. Through optimal sizing of these components, it is demonstrated that high switching frequency IGBT-based current source rectifiers can emerge as cost-effective solutions for industrial high-power electrolyser applications. © The Institution of engineering & Technology 2024.

关键词： Insulated gate bipolar transistors (IGBT)

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