June 20, 2021

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Microgrids and Methods of Analysis

Microgrids and Methods of Analysis
Author : Gevork Garehpetian,Hamid Reza Baghaee,Masoud M. Shabestary,S. Mohammad Mousavi Agah
Publisher : Academic Press
Release Date : 2019-08
Category : Science
Total pages :300
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Microgrids and Methods of Analysis addresses systematic analysis, control/protection systems design, and optimal operation of a distribution system under high-depth of DER penetration and the required, appropriate methods and software tools that are analogous to large interconnected power systems. Topics covered have been presented in many research papers, but there is still a need to summarize and categorize the presented and existing knowledge on this subject. This book presents the concept of the microgrid and the methods to analyze them systematically. Presents new analytical solutions for solving microgrid operational problems Develops the old methods for microgrid analysis Provides a new systematic insight to study in the field of microgrids

Transient Characteristics, Modelling and Stability Analysis of Microgrid

Transient Characteristics, Modelling and Stability Analysis of Microgrid
Author : Zhikang Shuai
Publisher : Springer Nature
Release Date : 2020-10-31
Category : Technology & Engineering
Total pages :290
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The book focuses on the transient modelling, stability analysis and control of power electronic systems, since these systems face severe safe operation problems the during transient period. It discusses both theoretical analysis and practical applications, highlighting the transient characteristics of converters with different control strategies, and proposes transient modelling and model reduction methods. Furthermore, it classifies the transient stability problems of the system to help the readers gain an understanding of the basic theoretical methods for analysing the power electronic system, at the same time providing sufficient detail to enable engineers to design such systems. Comprehensively describing theoretical analyses, ranging from system modelling and stability analysis to transient control, the book is a valuable resource for researchers, engineers and graduate students in fields of transient modelling, stability analysis and control of power electronic systems.

Distributed Control Methods and Cyber Security Issues in Microgrids

Distributed Control Methods and Cyber Security Issues in Microgrids
Author : Wenchao Meng,Xiaoyu Wang,Shichao Liu
Publisher : Academic Press
Release Date : 2020-03-22
Category : Technology & Engineering
Total pages :296
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Distributed Control and Cyber Security Issues in Microgrids presents a thorough treatment of distributed control methods and cyber security issues for power system researchers and engineers. With the help of mathematical tools, this reference gives a deep understanding of microgrids and new research directions, addressing emerging concepts, methodologies and applications of monitoring, control and protection in smart microgrids with large-scale renewables. With the integration of more distributed or aggregated renewables and the wide utilization of power electronic devices, the smart microgrid is facing new stability and security challenges. Includes global case studies to demonstrate distributed control success stories Offers detailed illustrations and flowcharts to address challenges and technical solutions for those working in power systems in utilities and industry Showcases new challenges faced in the stability and security of smart microgrids

Optimum Design of Renewable Energy Systems: Microgrid and Nature Grid Methods

Optimum Design of Renewable Energy Systems: Microgrid and Nature Grid Methods
Author : Obara, Shin’ya
Publisher : IGI Global
Release Date : 2014-03-31
Category : Technology & Engineering
Total pages :430
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The management of global warming is a relevant issue throughout the world and has experts of various fields considering various methods to control Earth’s atmospheric temperature. While microgrid technology is emerging as the next generation energy supply system, renewable energy is often unstable and requires the support of conventional energy equipment. Optimum Design of Renewable Energy Systems: Microgrid and Nature Grid Methods investigates the development of highly efficient energy storage equipment and of operation optimization technology of compound energy systems. This book is an essential reference source for technical consultants, urban environment engineers, and energy researchers interested in the development of efficient energy systems and operation optimization technology.

Modeling techniques and control strategies for inverter dominated microgrids

Modeling techniques and control strategies for inverter dominated microgrids
Author : Gkountaras, Aris
Publisher : Universitätsverlag der TU Berlin
Release Date : 2017-02-15
Category : Technology & Engineering
Total pages :169
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The character of modern power systems is changing rapidly and inverters are taking over a considerable part of the energy generation. A future purely inverter-based grid could be a viable solution, if its technical feasibility can be first validated. The focus of this work lies on inverter dominated microgrids, which are also mentioned as 'hybrid' in several instances throughout the thesis. Hybrid, as far as the energy input of each generator is concerned. Conventional fossil fuel based generators are connected in parallel to renewable energy sources as well as battery systems. The main contributions of this work comprise of: The analysis of detailed models and control structures of grid inverters, synchronous generators and battery packs and the utilization of these models to formulate control strategies for distributed generators. The developed strategies accomplish objectives in a wide time scale, from maintaining stability during faults and synchronization transients as well as optimizing load flow through communication-free distributed control. Die Struktur der modernen Energieversorgung hat sich in den letzten Jahrzehnten massiv geändert. Dezentrale Generatoren, die auf Wechselrichtern basieren, übernehmen einen großen Teil der Energieerzeugung. Ein ausschließlich wechselrichterbasiertes Netz wäre ein realistischer Ansatz, wenn seine technische Machbarkeit verifiziert werden könnte. Die wichtigste Beiträge dieser Arbeit sind: Die Analyse von Modellen und Regelstrukturen von Netzwechselrichtern, Synchrongeneratoren und Batterieanlagen. Die entwickelten Modelle werden verwendet, um Regelstrategien für dezentrale Generatoren in Mittelspannungsinselnetzen zu formulieren. Die erste Strategie ist eine Synchronisationsmethode für netzbildende Wechselrichter. Zweitens wird die Leistungsaufteilung in Mittelspannungsinselnetzen mittels Droop Regelung analysiert. Weiterhin erfolgt die Untersuchung der transienten Lastaufteilung zwischen netzbildenden Einheiten mit unterschiedlichen Zeitkonstanten. Beim Betrieb mehrerer paralleler Wechselrichter wird der Einfluss der Netzimpedanz auf die transiente Lastaufteilung analysiert. Die dritte entworfene Regelstrategie umfasst die Integration der Sekundärregelung in die Primärregelung. Der Ladezustand von Batterien wird mit der Lastaufteilung gekoppelt, um die Autonomie des Netzes zu stärken. Abschließend wird eine Kurzschlussstrategie für netzbildende und netzspeisende Wechselrichter entwickelt. Ziel der Strategie ist die Maximierung des Kurzschlussstromes. Als zusätzliche Randbedingung soll keine Kommunikation zwischen Generatoren stattfinden.

A Framework for Microgrid Analysis Using OpenDSS

A Framework for Microgrid Analysis Using OpenDSS
Author : Sryang Tera Sarena
Publisher : LAP Lambert Academic Publishing
Release Date : 2014-02
Category :
Total pages :88
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In recent years, along with the rise of global warming issue, researches of renewable energy usage for producing electricity are sprung up. The penetration of renewable energy usage to microgrid brings new challenge as most of the renewable energy are unpredictable. In order to get optimal microgrid operation, integration of methods and softwares are needed in microgrid analysis. This study will use OpenDSS in cooperation with Matlab. Thus optimization algorithm implementation can be achieved by Matlab and simulations of microgrid performed in OpenDSS. The establishment constructs a flexible framework for microgrid analysis which is extensible for various practical studies.

Microgrid Architectures, Control and Protection Methods

Microgrid Architectures, Control and Protection Methods
Author : Naser Mahdavi Tabatabaei,Ersan Kabalci,Nicu Bizon
Publisher : Springer
Release Date : 2019-08-01
Category : Technology & Engineering
Total pages :781
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This book presents intuitive explanations of the principles of microgrids, including their structure and operation and their applications. It also discusses the latest research on microgrid control and protection technologies and the essentials of microgrids as well as enhanced communication systems. The book provides solutions to microgrid operation and planning issues using various methodologies including planning and modelling; AC and DC hybrid microgrids; energy storage systems in microgrids; and optimal microgrid operational planning. Written by specialists, it is filled in innovative solutions and research related to microgrid operation, making it a valuable resource for those interested in developing updated approaches in electric power analysis, design and operational strategies. Thanks to its in-depth explanations and clear, three-part structure, it is useful for electrical engineering students, researchers and technicians.

Linearized and Distributed Methods for Power Flow Analysis and Control in Smart Grids and Microgrids

Linearized and Distributed Methods for Power Flow Analysis and Control in Smart Grids and Microgrids
Author : Niannian Cai
Publisher : Unknown
Release Date : 2014
Category : Electronic dissertations
Total pages :148
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Distributed Energy Resources in Microgrids

Distributed Energy Resources in Microgrids
Author : Rajeev Kumar Chauhan,Kalpana Chauhan
Publisher : Academic Press
Release Date : 2019-08-17
Category : Science
Total pages :554
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Distributed Energy Resources in Microgrids: Integration, Challenges and Optimization unifies classically unconnected aspects of microgrids by considering them alongside economic analysis and stability testing. In addition, the book presents well-founded mathematical analyses on how to technically and economically optimize microgrids via distributed energy resource integration. Researchers and engineers in the power and energy sector will find this information useful for combined scientific and economical approaches to microgrid integration. Specific sections cover microgrid performance, including key technical elements, such as control design, stability analysis, power quality, reliability and resiliency in microgrid operation. Addresses the challenges related to the integration of renewable energy resources Includes examples of control algorithms adopted during integration Presents detailed methods of optimization to enhance successful integration

Hybrid-Renewable Energy Systems in Microgrids

Hybrid-Renewable Energy Systems in Microgrids
Author : Hina Fathima,Prabaharan N,Palanisamy K,Akhtar Kalam,Saad Mekhilef,Jackson J. Justo
Publisher : Woodhead Publishing
Release Date : 2018-06-02
Category : Science
Total pages :268
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Hybrid-Renewable Energy Systems in Microgrids: Integration, Developments and Control presents the most up-to-date research and developments on hybrid-renewable energy systems (HRES) in a single, comprehensive resource. With an enriched collection of topics pertaining to the control and management of hybrid renewable systems, this book presents recent innovations that are molding the future of power systems and their developing infrastructure. Topics of note include distinct integration solutions and control techniques being implemented into HRES that are illustrated through the analysis of various global case studies. With a focus on devices and methods to integrate different renewables, this book provides those researching and working in renewable energy solutions and power electronics with a firm understanding of the technologies available, converter and multi-level inverter considerations, and control and operation strategies. Includes significant case studies of control techniques and integration solutions which provide a deeper level of understanding and knowledge Combines existing research into a single informative resource on micro grids with HRES integration and control Includes architectural considerations and various control strategies for the operation of hybrid systems

Modelling, Operation and Analysis of DC Grids

Modelling, Operation and Analysis of DC Grids
Author : Alejandro Garces
Publisher : Academic Press
Release Date : 2021-07-15
Category : Science
Total pages :376
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Modelling, Operation and Analysis of DC Grids presents a unified vision of direct current grids with core analysis techniques that unite power electronics, power systems, and multiple scales of applications. Sections cover the role of power electronics in DC grids, addressing DC/DC converters, voltage source converters, and MMC converters, current applications modalities across multiple scales, from high power applications such as electric vehicles, DC microgrids and MT-HVDC transmission, through offshore wind farms and supergrids, and a power systems analysis of microgrids that addresses modeling, stationary state analysis, stability estimation, fault analysis, optimal power flow, and stochastic analysis. Chapters are extensively supported by test systems devised in MATLAB and Simulink. Provides a unified, coherent presentation of DC grid analysis based on modern research in power systems, power electronics, microgrids and MT-HVDC transmission Covers multiple scales of applications in one location, addressing DC grids in electric vehicles, microgrids, DC distribution, multi-terminal HVDC transmission and supergrids Supported by a unified set of MATLAB and Simulink test systems designed for application scenarios

Optimization of Unit Commitment and Economic Dispatch in Microgrids Based on Genetic Algorithm and Mixed Integer Linear Programming

Optimization of Unit Commitment and Economic Dispatch in Microgrids Based on Genetic Algorithm and Mixed Integer Linear Programming
Author : Mohsen Shiralizadeh Nemati
Publisher : kassel university press GmbH
Release Date : 2018-04-16
Category :
Total pages :187
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Energy Management System (EMS) applications of modern power networks like microgrids have to respond to a number of stringent challenges due to current energy revolution. Optimal resource dispatch tasks must be handled with specific regard to the addition of new resource types and the adoption of novel modeling considerations. In addition, due to the comprehensive changes concerning the multi cell grid structure, new policies should be fulfilled via microgrids’ EMS. At the same time achieving a variety of conflicting goals in different microgrids requires a universal and a multi criteria optimization tool. In this work two dispatch-optimizers based on genetic algorithm and mixed integer linear programming for a centralized EMS are introduced which can schedule the unit commitment and economic dispatch of microgrid units. In the proposed methods, different network restrictions like voltages and equipment loadings and unit constraints have been considered.

Microgrid Technologies

Microgrid Technologies
Author : C. Sharmeela,P. Sivaraman,P. Sanjeevikumar,Jens Bo Holm-Nielsen
Publisher : John Wiley & Sons
Release Date : 2021-03-11
Category : Computers
Total pages :560
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Microgrid technology is an emerging area, and it has numerous advantages over the conventional power grid. A microgrid is defined as Distributed Energy Resources (DER) and interconnected loads with clearly defined electrical boundaries that act as a single controllable entity concerning the grid. Microgrid technology enables the connection and disconnection of the system from the grid. That is, the microgrid can operate both in grid-connected and islanded modes of operation. Microgrid technologies are an important part of the evolving landscape of energy and power systems. Many aspects of microgrids are discussed in this volume, including, in the early chapters of the book, the various types of energy storage systems, power and energy management for microgrids, power electronics interface for AC & DC microgrids, battery management systems for microgrid applications, power system analysis for microgrids, and many others. The middle section of the book presents the power quality problems in microgrid systems and its mitigations, gives an overview of various power quality problems and its solutions, describes the PSO algorithm based UPQC controller for power quality enhancement, describes the power quality enhancement and grid support through a solar energy conversion system, presents the fuzzy logic-based power quality assessments, and covers various power quality indices. The final chapters in the book present the recent advancements in the microgrids, applications of Internet of Things (IoT) for microgrids, the application of artificial intelligent techniques, modeling of green energy smart meter for microgrids, communication networks for microgrids, and other aspects of microgrid technologies. Valuable as a learning tool for beginners in this area as well as a daily reference for engineers and scientists working in the area of microgrids, this is a must-have for any library.

Analysis and Mitigation of Frequency Disturbances in an Islanded Microgrid

Analysis and Mitigation of Frequency Disturbances in an Islanded Microgrid
Author : Abrez Mondal
Publisher : Unknown
Release Date : 2017
Category : Microgrids (Smart power grids)
Total pages :121
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The advent of microgrids has shifted the focus from centralized power generation to a more distributed manner, involving a mix of different distributed energy resources (DERs). Reciprocating engine driven synchronous generators (referred as gensets) are a common DER used for distributed generation. One of the key concerns with such power networks is the aspect of frequency regulation under large disturbances, especially in an islanded mode of operation, without the support of the utility grid. This works looks at possible solution methods for mitigating large frequency disturbances in an islanded microgrid. Due to steep load changes, the gensets undergo large frequency swings and can be even vulnerable to stalling. The benefits of smart loads are analyzed in this work to prevent such occurrence by temporarily reducing the transient overload on gensets. Another solution to mitigate large frequency deviation is the integration of energy storage system (ESS), but the effectiveness depends on its operation as a grid-forming or a grid-following unit. Important metrics such as frequency nadir during load changes in the islanded microgrid are computed to show the usefulness of ESS in islanded microgrids. For this purpose, analytical methods using reduced-order models are developed and found to provide accurate estimates of frequency deviations under power system disturbances. Generally, ESS units are interfaced with an inverter and when operated in grid-forming mode can offer desired dynamic frequency behavior in an islanded microgrid. Similarly, other inverter-based DERs can also provide good frequency regulation as they share the larger portion of the transient overload compared to gensets. However, under certain scenarios the inverter-based DERs are found to collapse due to this large transient loading and can bring down the whole microgrid system as a result. A better coordination between the different DERs in a mixed source microgrid is facilitated in this work to guarantee adequate inertial response. Such a scheme redistributes the unequal transient load sharing between gensets and inverter-based DERs and provides improved frequency regulation, without compromising on the survivability of islanded microgrids. The use of smart loads is also incorporated as an additional feature in the overall coordinated scheme for withstanding extreme scenarios.

Sustainable Power Systems

Sustainable Power Systems
Author : Nava Raj Karki,Rajesh Karki,Ajit Kumar Verma,Jaeseok Choi
Publisher : Springer
Release Date : 2017-01-10
Category : Business & Economics
Total pages :174
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This book deals with quantifying and analyzing the risks associated with sustainable energy technology growth in electric power systems, and developing appropriate models and methodologies to mitigate the risks and improve the overall system performance. The rapid increase in the installation of renewable energy sources in electric power systems has given rise to a wide range of problems related to planning and operation of power systems to maintain quality, stability, reliability and efficiency. Additionally, there is a growing global environmental concern regarding increasing emissions from the electric power generation required to meet rising energy needs and support sustainable and inclusive development. The phenomenon of low voltage ride through (LVRT), common to wind energy systems, is discussed, and ways to tackle the same are proposed in the first chapter. Subsequent chapters propose methods of optimizing a sustainable and smart microgrid, and supplying electricity to remote areas of a developing country with no immediate possibility of national grid extension. The economic benefit and technical challenges of forming localized minigrid are also discussed. The book proposes a method for reliability assessment of a power grid with sustainable power transportation system. The issue of weak link in power system is very important as it will provide the system operators and planners to take necessary measures to strengthen the system. An approach to determine the weak parts of the system and its unreliability is proposed. With increasing installation of HVDC power transmission and development of efficient and low cost power electronic devices, the DC microgrids are becoming a common phenomenon. Their existence together with AC Grids result in Hybrid AC/DC Microgrids, which are discussed in this book. It further presents a method for reliability evaluation of a distribution system with network reconfiguration in the presence of distributed generation. The important problems in sustainable energy growth, and their potential solutions discussed and presented in the book should be of great interest to engineers, policy makers, researchers and academics in the area of electric power engineering.