83 research outputs found

    Power Quality in Electrified Transportation Systems

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    "Power Quality in Electrified Transportation Systems" has covered interesting horizontal topics over diversified transportation technologies, ranging from railways to electric vehicles and ships. Although the attention is chiefly focused on typical railway issues such as harmonics, resonances and reactive power flow compensation, the integration of electric vehicles plays a significant role. The book is completed by some additional significant contributions, focusing on the interpretation of Power Quality phenomena propagation in railways using the fundamentals of electromagnetic theory and on electric ships in the light of the latest standardization efforts

    Functional dielectrics in-depth study

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    Навчальний посібник присвячено фізичним основам та практичному застосуванню в електроніці багатофункціональних діелектриків. Дається коротка історія основних стадій розвитку електроніки та фізичні основи сучасного електронного матеріалознавства. Представлені сучасні уявлення про фізичні механізми функціональності методом порівняння усталених концепцій і нових ідей: для демонстрації динаміки розвитку деяких напрямів функціональної електроніки дискусійнсіоні теорії порівнюються з класичними уявленнями. Використовуються сучасні дослідження мікроелектроніки та нанофізики, демонструється зв'язок внутрішньої структури та фізичних властивостей матеріалів. Навчальний посібник заснований на багаторічному досвіді авторів у викладанні курсу фізичного матеріалознавства, призначеного для студентів вищих навчальних закладів зі спеціалізацією 105 "Прикладна фізика та наноматерили". Книга може бути рекомендована аспірантам та дослідникам, що спеціалізуються в галузі матеріалознавства.The textbook discusses new developments, some methods for calculating parameters and practical application of functional dielectrics. Modern theoretical concepts, new experimental data main specifications of basic materials are considered. Provides basic data on the history of electronics, as well as the basic information about the materials used in electronics is given. The focus is on explaining the physical mechanisms of many effects used in modern electronics. The textbook is based on the authors' many years of experience in teaching physical materials science, intended for the students of higher educational institutions with specializations in the fields of "Applied Physics" and "Microelectronics and nanoelectronics". The book can also be used by the graduate students, engineers and researchers specializing in the materials science

    Advances and Technologies in High Voltage Power Systems Operation, Control, Protection and Security

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    The electrical demands in several countries around the world are increasing due to the huge energy requirements of prosperous economies and the human activities of modern life. In order to economically transfer electrical powers from the generation side to the demand side, these powers need to be transferred at high-voltage levels through suitable transmission systems and power substations. To this end, high-voltage transmission systems and power substations are in demand. Actually, they are at the heart of interconnected power systems, in which any faults might lead to unsuitable consequences, abnormal operation situations, security issues, and even power cuts and blackouts. In order to cope with the ever-increasing operation and control complexity and security in interconnected high-voltage power systems, new architectures, concepts, algorithms, and procedures are essential. This book aims to encourage researchers to address the technical issues and research gaps in high-voltage transmission systems and power substations in modern energy systems

    Друга міжнародна конференція зі сталого майбутнього: екологічні, технологічні, соціальні та економічні питання (ICSF 2021). Кривий Ріг, Україна, 19-21 травня 2021 року

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    Second International Conference on Sustainable Futures: Environmental, Technological, Social and Economic Matters (ICSF 2021). Kryvyi Rih, Ukraine, May 19-21, 2021.Друга міжнародна конференція зі сталого майбутнього: екологічні, технологічні, соціальні та економічні питання (ICSF 2021). Кривий Ріг, Україна, 19-21 травня 2021 року

    30th International Conference on Electrical Contacts, 7 – 11 Juni 2021, Online, Switzerland: Proceedings

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    Optimal Control of Hybrid Systems and Renewable Energies

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    This book is a collection of papers covering various aspects of the optimal control of power and energy production from renewable resources (wind, PV, biomass, hydrogen, etc.). In particular, attention is focused both on the optimal control of new technologies and on their integration in buildings, microgrids, and energy markets. The examples presented in this book are among the most promising technologies for satisfying an increasing share of thermal and electrical demands with renewable sources: from solar cooling plants to offshore wind generation; hybrid plants, combining traditional and renewable sources, are also considered, as well as traditional and innovative storage systems. Innovative solutions for transportation systems are also explored for both railway infrastructures and advanced light rail vehicles. The optimization and control of new solutions for the power network are addressed in detail: specifically, special attention is paid to microgrids as new paradigms for distribution networks, but also in other applications (e.g., shipboards). Finally, optimization and simulation models within SCADA and energy management systems are considered. This book is intended for engineers, researchers, and practitioners that work in the field of energy, smart grid, renewable resources, and their optimization and control

    Engineering Education and Research Using MATLAB

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    MATLAB is a software package used primarily in the field of engineering for signal processing, numerical data analysis, modeling, programming, simulation, and computer graphic visualization. In the last few years, it has become widely accepted as an efficient tool, and, therefore, its use has significantly increased in scientific communities and academic institutions. This book consists of 20 chapters presenting research works using MATLAB tools. Chapters include techniques for programming and developing Graphical User Interfaces (GUIs), dynamic systems, electric machines, signal and image processing, power electronics, mixed signal circuits, genetic programming, digital watermarking, control systems, time-series regression modeling, and artificial neural networks

    Numerical Simulations

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    This book will interest researchers, scientists, engineers and graduate students in many disciplines, who make use of mathematical modeling and computer simulation. Although it represents only a small sample of the research activity on numerical simulations, the book will certainly serve as a valuable tool for researchers interested in getting involved in this multidisciplinary field. It will be useful to encourage further experimental and theoretical researches in the above mentioned areas of numerical simulation

    Wind Farm

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    During the last two decades, increase in electricity demand and environmental concern resulted in fast growth of power production from renewable sources. Wind power is one of the most efficient alternatives. Due to rapid development of wind turbine technology and increasing size of wind farms, wind power plays a significant part in the power production in some countries. However, fundamental differences exist between conventional thermal, hydro, and nuclear generation and wind power, such as different generation systems and the difficulty in controlling the primary movement of a wind turbine, due to the wind and its random fluctuations. These differences are reflected in the specific interaction of wind turbines with the power system. This book addresses a wide variety of issues regarding the integration of wind farms in power systems. The book contains 14 chapters divided into three parts. The first part outlines aspects related to the impact of the wind power generation on the electric system. In the second part, alternatives to mitigate problems of the wind farm integration are presented. Finally, the third part covers issues of modeling and simulation of wind power system

    Development of a current limiting solid-state circuit breaker based on wide-band gap power semiconductor devices for 400V DC microgrid protection

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    Popularity of DC distribution systems is increasing for many residential and industrial applications such as data centres, commercial and residential buildings, telecommunication systems, and transport power networks etc. Compared to AC systems, they have demonstrated higher power efficiency, less complexity, and more readiness of integrating with various local power sources and DC electronic loads. However, one of the major technical issues hindering this trend is the lack of effective DC fault protection devices/circuits. Although conventional electromechanical circuit breakers work well in AC systems, they are not suitable for DC systems due to their long response time (ranging from tens of milliseconds to hundreds of milliseconds). Such a long response time is far beyond the withstand time (typically tens of microseconds) of most power electronic devices in short-circuit operating conditions. In contrast, Solid-State Circuit Breakers (SSCBs) are able to offer ultrafast switching speed thanks to the modern power semiconductor devices which can turn off in microseconds or even in tens of nanoseconds. Furthermore, the ever-increasing fault current level in DC systems poses a significant mechanical and thermal stress on the whole DC system. Therefore, the desire for the protection devices with the feature of fast switching speed along with the current-limiting capability has prompted intensive research in this area over the last decade in both academia and industry. However, the relatively high conduction losses and limited short-circuit capability are two of the major drawbacks of SSCBs. With the growing maturity and increasingly commercial availability of Wide-Bandgap (WBG) semiconductor devices, a SSCB based-on WBG devices is a promising solution to alleviate the issues since WBG semiconductors have demonstrated superior material properties over the conventional silicon material such as lower specific on-resistance, higher junction temperatures and higher breakdown voltage. This research aims to design and develop a WBG-based solid-state circuit breaker for a 400V DC microgrid application. To accomplish this task, this work starts with a comprehensive review of DC microgrid technology followed by an extensive review of the state-of-the-art DC circuit breakers. Then, to develop a circuit topology for the proposed SSCB, a practical current limiter is analysed, simulated, and evaluated. Based on this topology, the proposed SSCB is configured with a high-voltage normally-on Silicon Carbide Junction Field Effect Transistors (SiC-JFETs) cascading a low-voltage normally-off power MOSFET. This solution offers several advantages. For example, it does not require any additional sensing and tripping circuitry for short-circuit protection and therefore has a fast response speed. Meanwhile, the use of power SiC JFETs tends to reduce the conduction losses and enhance the short-circuit robustness of SSCBs. In addition, it offers the feature of current limiting which could ease the thermal and mechanical stresses on the whole DC system. The operating process of the proposed SSCB is analysed and the analytical results are compared with the simulated results; In the end, a prototype SSCB has been built and evaluated for short-circuit protection in a 400V DC system. In addition, to effectively suppress the overvoltage at the turn-off of SSCBs, a novel hybrid snubber circuit has been proposed by taking into account the advantages offered by both conventional Resistor-Capacitor-Diode (RCD) snubbers and Metal-Oxide Varistors (MOVs). Finally, other functions of the proposed SSCBs including overload protection, over temperature protection and protection coordination have been investigated and some operating issues such as false tripping and SSCB reset have been addressed
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