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Contribution To The Control Of Doubly Fed Induction Generators In Wind Power Plants With Particular Consideration Of Asymmetrical Grid Conditions
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Book Synopsis Contribution to the Control of Doubly-fed Induction Generators in Wind Power Plants with Particular Consideration of Asymmetrical Grid Conditions by : Marlies Richter
Download or read book Contribution to the Control of Doubly-fed Induction Generators in Wind Power Plants with Particular Consideration of Asymmetrical Grid Conditions written by Marlies Richter and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Die vorgelegte Arbeit stellt vier Verfahren für die Regelung der Umrichterströme einer doppelt-gespeisten Asynchronmaschine (DGASM) vor. Diese werden mit Hilfe von Simulationen mit Matlab/Simulink analysiert. Besondere Beachtung wird dabei dem Verhalten des Generators während unsymmetrischer Spannungseinbrüche im elektrischen Netz geschenkt. Die vorgestellten Regelungsverfahren haben zum Ziel Drehmoment- und Zwischenkreisspannungsschwingungen während solcher Fehlerfälle zu reduzieren und damit die zusätzlichen Belastungen des Systems zu verringern. Die feldorientierte Regelung (FOR) wird häufig zur Regelung von DGASMs in Windkraftanlagen eingesetzt und dient in dieser Arbeit als Vergleichsbasis. Die getrennte Regelung von Mit- und Gegensystemströmen in zwei entgegengesetzt rotierenden Koordinatensystemen wird im Rahmen der vorgelegten Arbeit als PN-Regelung (PNR) bezeichnet. Für diese Regelung werden vier PI-Regler verwendet. Im Gegensatz zur feldorientierten und zur PN-Regelung arbeitet die frequenzselektive Regelung (FSR) in einem ruhenden Koordinatensystem. In diesem werden die Umrichterströme als Wechselgrößen in alpha-beta-Komponenten geregelt. Die Kombination von frequenzselektiver und PN-Regelung ergibt die in dieser Arbeit als FS(PN)-Regelung bezeichnete Struktur, in der die Ströme ebenfalls in einem ruhenden Koordinatensystem als Wechselgrößen geregelt werden, wobei gezielt Sollwerte auch für die Gegensystemkomponenten vorgegeben werden. Sowohl theoretische Überlegungen als auch die durchgeführten Simulationen zeigen, dass die drei vorgeschlagenen alternativen Regelungsverfahren das Verhalten der DGASM während leichter Unsymmetrien verbessern können. Die möglichen Verbesserungen sind allerdings sowohl durch die vorhandene Hardware (Auslegung der Umrichter: maximal zulässige Ströme und Spannungen), durch die Regelungsverfahren selbst (zeitliche Verzögerungen durch die Berechnung der Mit- und Gegensystemkomponenten bei PN- und FS(PN)-Regelung) als auch durch Nichtlinearitäten des Systems (Sättigung der Hauptinduktivität der DGASM) begrenzt. Eine Anwendung der vorgestellten neuen Regelungsverfahren auf andere Probleme wie z.B. Photovoltaikwechselrichter oder Umrichter für Windkraftanlagen mit Vollumrichter erscheint dennoch vielversprechend.
Book Synopsis Advanced Control of Doubly Fed Induction Generator for Wind Power Systems by : Dehong Xu
Download or read book Advanced Control of Doubly Fed Induction Generator for Wind Power Systems written by Dehong Xu and published by John Wiley & Sons. This book was released on 2018-08-14 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers the fundamental concepts and advanced modelling techniques of Doubly Fed Induction Generators accompanied by analyses and simulation results Filled with illustrations, problems, models, analyses, case studies, selected simulation and experimental results, Advanced Control of Doubly Fed Induction Generator for Wind Power Systems provides the basic concepts for modelling and controlling of Doubly Fed Induction Generator (DFIG) wind power systems and their power converters. It explores both the challenges and concerns of DFIG under a non-ideal grid and introduces the control strategies and effective operations performance options of DFIG under a non-ideal grid. Other topics of this book include thermal analysis of DFIG wind power converters under grid faults; implications of the DFIG test bench; advanced control of DFIG under harmonic distorted grid voltage, including multiple-loop and resonant control; modeling of DFIG and GSC under unbalanced grid voltage; the LFRT of DFIG, including the recurring faults ride through of DFIG; and more. In addition, this resource: Explores the challenges and concerns of Doubly Fed Induction Generators (DFIG) under non-ideal grid Discusses basic concepts of DFIG wind power system and vector control schemes of DFIG Introduces control strategies under a non-ideal grid Includes case studies and simulation and experimental results Advanced Control of Doubly Fed Induction Generator for Wind Power Systems is an ideal book for graduate students studying renewable energy and power electronics as well as for research and development engineers working with wind power converters.
Book Synopsis Control of a Wind Driven Doubly Fed Induction Generator During Grid Faults by : Mahmoud Mossa
Download or read book Control of a Wind Driven Doubly Fed Induction Generator During Grid Faults written by Mahmoud Mossa and published by GRIN Verlag. This book was released on 2013-02-06 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master's Thesis from the year 2013 in the subject Engineering - Power Engineering, grade: none, , course: Electrical engineering (Renewable energy), language: English, abstract: Wind electrical power systems are recently getting lot of attention, because they are cost competitive, environmental clean and safe renewable power source, as compared with fossil fuel and nuclear power generation. A special type of induction generator, called a doubly fed induction generator (DFIG), is used extensively for high-power wind applications. They are used more and more in wind turbine applications due to ease controllability, high energy efficiency and improved power quality. This thesis aims to develop a method of a field orientation scheme for control both the active and reactive powers of a DFIG driven by a wind turbine.The proposed control system consists of a wind turbine that drives a DFIG connected to the utility grid through AC-DC-AC link. The main control objective is to regulate the dc link voltage for operation at maximum available wind power.This is achieved by controlling the and axes components of voltages and currents for both rotor side and line side converters using PI controllers. The complete dynamic model of the proposed system is described in detail. Computer simulations have been carried out in order to validate the effectiveness of the proposed system during the variation of wind speed. The results prove that , better overall performances are achieved, quick recover from wind speed disturbances in addition to good tracking ability. Generally, any abnormalities associated with grid asymmetrical faults are going to affect the system performance considerably. During grid faults, unbalanced currents cause negative effects like overheating problems and mechanical stress due to high torque pulsations that can damage the rotor shaft, gearbox or blade assembly. Therefore, the dynamic model of the DFIG, driven by a wind turbine during grid faults has been analyzed and developed using the method of symmetrical components. The dynamic performance of the DFIG during unbalanced grid conditions is analyzed and described in detail using digital simulations. A novel fault ride-through (FRT) capability is proposed (i.e. the ability of the power system to remain connected to the grid during faults) with suitable control strategy in this thesis. In this scheme, the input mechanical energy of the wind turbine during grid faults is stored and utilized at the moment of fault clearance, instead of being dissipated in the resistors of the crowbar circuit as in the existing FRT schemes. [...]
Book Synopsis Advanced Controls for Wind Driven Doubly Fed Induction Generators by : Mahmoud K. Abdelhamid
Download or read book Advanced Controls for Wind Driven Doubly Fed Induction Generators written by Mahmoud K. Abdelhamid and published by CRC Press. This book was released on 2023-12-22 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Controls for Wind Driven Doubly Fed Induction Generators discusses the most advanced control algorithms used for enhancing the dynamics of a doubly fed induction generator (DFIG) operating at fixed and variable speeds, and which are used for different utilization purposes (standalone and grid connection). Extensive generator performance analysis has been introduced using various control topologies. Features: Presents modeling of wind energy conversion systems (WECS), including a wind turbine as a prime mover, a DFIG as a generation unit for electrical energy, and a three-phase induction motor as an isolated load Explores a detailed description for the presented control algorithms in order to visualize the base principle of each method Introduces a comprehensive performance analysis for the DFIG using the formulated predictive voltage control scheme and other control techniques under different operating conditions Examines the formulation of new control approaches which overcome the shortages present in previous DFIG control schemes Presents a detailed comparison between different control topologies for the DFIG to outline the most effective procedure in terms of dynamic response, structure simplicity, ripples, total harmonic distortion, and computational burdens The book is written for researchers and academics working on advanced control systems and those interested in areas such as machine drives, renewable energy systems, 'adaptive control', modeling of WECS, and optimization theory.
Book Synopsis Doubly Fed Induction Generators by : Edgar N. Sanchez
Download or read book Doubly Fed Induction Generators written by Edgar N. Sanchez and published by CRC Press. This book was released on 2016-08-05 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: Doubly Fed Induction Generators: Control for Wind Energy provides a detailed source of information on the modeling and design of controllers for the doubly fed induction generator (DFIG) used in wind energy applications. Focusing on the use of nonlinear control techniques, this book: Discusses the main features and advantages of the DFIG Describes key theoretical fundamentals and the DFIG mathematical model Develops controllers using inverse optimal control, sliding modes, and neural networks Devises an improvement to add robustness in the presence of parametric variations Details the results of real-time implementations All controllers presented in the book are tested in a laboratory prototype. Comparisons between the controllers are made by analyzing statistical measures applied to the control objectives.
Book Synopsis Modeling and Analysis of Doubly Fed Induction Generator Wind Energy Systems by : Lingling Fan
Download or read book Modeling and Analysis of Doubly Fed Induction Generator Wind Energy Systems written by Lingling Fan and published by Academic Press. This book was released on 2015-04-16 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind Energy Systems: Modeling, Analysis and Control with DFIG provides key information on machine/converter modelling strategies based on space vectors, complex vector, and further frequency-domain variables. It includes applications that focus on wind energy grid integration, with analysis and control explanations with examples. For those working in the field of wind energy integration examining the potential risk of stability is key, this edition looks at how wind energy is modelled, what kind of control systems are adopted, how it interacts with the grid, as well as suitable study approaches. Not only giving principles behind the dynamics of wind energy grid integration system, but also examining different strategies for analysis, such as frequency-domain-based and state-space-based approaches. Focuses on real and reactive power control Supported by PSCAD and Matlab/Simulink examples Considers the difference in control objectives between ac drive systems and grid integration systems
Book Synopsis Doubly Fed Induction Machine by : Gonzalo Abad
Download or read book Doubly Fed Induction Machine written by Gonzalo Abad and published by John Wiley & Sons. This book was released on 2011-09-28 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will be focused on the modeling and control of the DFIM based wind turbines. In the first part of the book, the mathematical description of different basic dynamic models of the DFIM will be carried out. It will be accompanied by a detailed steady-state analysis of the machine. After that, a more sophisticated model of the machine that considers grid disturbances, such as voltage dips and unbalances will be also studied. The second part of the book surveys the most relevant control strategies used for the DFIM when it operates at the wind energy generation application. The control techniques studied, range from standard solutions used by wind turbine manufacturers, to the last developments oriented to improve the behavior of high power wind turbines, as well as control and hardware based solutions to address different faulty scenarios of the grid. In addition, the standalone DFIM generation system will be also analyzed.
Book Synopsis Control Design and Analysis of Doubly-fed Induction Generator in Wind Power Application by : Shukul Mazari
Download or read book Control Design and Analysis of Doubly-fed Induction Generator in Wind Power Application written by Shukul Mazari and published by . This book was released on 2009 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work presented in this thesis includes control system design, analysis and grid synchronization of a DFIG (doubly-fed induction generator) driven by a wind turbine using stator-voltage and stator-flux oriented frames. The DFIG is a special type of induction machine which is comprised of two back-to-back converters. One converter connects the DFIG stator to the grid, and the second converter is connected to the rotor of the machine through a DC-link capacitor. In this work, DFIG steady-state and transient models have been created in the d-q reference frame. The steady-state model is used to obtain the relationship between the rotor d-q currents and stator real/reactive power references in a particular orientation frame. The transient model is used to develop the DFIG power control mechanisms. The wind turbine driving torque is modeled by considering typical wind turbine aerodynamic characteristics under variable wind and pitch angle conditions. Comparisons are made to evaluate the differences between DFIG current/power controller in stator-voltage and stator-flux oriented frames. A speed control system has been designed to analyze maximum energy extraction from a DFIG for a particular wind speed. Lastly, the grid synchronization control technique and synchronization method have been proposed as this system requires some care during the machine start-up and integration with the grid. The main aim of the synchronization control process is to avoid heavy start-up currents and mechanical stresses on the turbine shaft and other integrated components. This is achieved by properly matching the phase angle, frequency, and magnitude of the grid voltage and the stator induced voltage irrespective of whether it is a stator-voltage or stator-flux oriented frame used for modeling the generator. Instead of a traditional control scheme using a PLL (phase-locked loop), the rotor d-q reference current is generated with grid voltage as the reference so as to induce identical voltage in the stator as that of the grid. The machine is started by a driving torque and the switch between stator and the grid can be closed for synchronization. However, appropriate timing of switch closure plays a critical role in satisfying the magnitude condition of synchronization. Simulation models have been developed using Matlab®/Simulink® for a GE 1.5 MW generator.
Book Synopsis Wind Driven Doubly Fed Induction Generator by : Adel Abdelbaset
Download or read book Wind Driven Doubly Fed Induction Generator written by Adel Abdelbaset and published by Springer. This book was released on 2017-10-30 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a modified model reference adaptive system (MRAS) observer for sensorless vector control of a wind driven doubly fed induction generator (DFIG). A mathematical model of the DFIG as influenced by core loss and main flux saturation is developed. The authors describe and evaluate grid synchronization enhancement of a wind driven DFIG using adaptive sliding mode control (SMC). Besides, grid synchronization of a wind driven DFIG under unbalanced grid voltage is also fully covered in this book.
Book Synopsis Control of Doubly-fed Induction Generators Under Asymmetrical Grid Conditions by : Marlies Richter
Download or read book Control of Doubly-fed Induction Generators Under Asymmetrical Grid Conditions written by Marlies Richter and published by . This book was released on 2006 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: In den letzten Jahren ist die Zahl der Windkraftanlagen zur Gewinnung elektrischer Energie stetig gestiegen. Damit stieg auch der Einfluss der WKAs auf die Stabilität der Netze und die Elektroenergiequalität. Ein wichtiges Entwicklungsziel ist daher die Anpassung der Windkraftanlagen an aktuelle und zukünftige Netzanschlussbedingungen. Besonders wichtig ist das Verhalten der Anlagen während asymmetrischen Netzbedingungen und insbesondere während Fehlern. Ein Ziel besteht darin, die Anlage auch während Fehler im Netz weiterbetreiben zu können (keine Netztrennung) und andererseits die zusätzlichen Belastungen für die Anlage gering zu halten. - In Windkraftanlagen werden häufig doppelt gespeiste Asynchronmaschinen eingesetzt. Daher bestand das Ziel dieser Arbeit darin, die Regelung einer doppelt gespeisten Asynchronmaschine an asymmetrische Netzbedingungen anzupassen. Als erster Schritt wurden dabei nur geringe aber langdauernde Asymmetrien im Netz betrachtet. - Sowohl für die maschinen- wie auch für die netzseitige Regelung wurde eine Regelungsstruktur entwickelt. Diese beinhalten zusätzlich zu den konventionellen Reglern Regler für die Gegensystemströme. Diese zusätzlichen Regler entsprechen zusätzlichen Freiheitsgraden, mit denen weitere Regelungsziele erreicht werden können. Das Ziel der maschinenseitigen Regelung war die Verringerung von Schwingungen des elektrischen Drehmomentes während Asymmetrien. Das Ziel der netzseitigen Reglung war die Reduktion von Schwingungen der Zwischenkreisspannung. In Simulationen konnten beide Ziele erreicht werden. - Alle Simulationen wurden mit PSCAD/EMTDC durchgeführt.
Book Synopsis Modeling, Analysis and Enhancement of the performance of a Wind Driven DFIG During steady state and transient conditions by : Mohmoud Mossa
Download or read book Modeling, Analysis and Enhancement of the performance of a Wind Driven DFIG During steady state and transient conditions written by Mohmoud Mossa and published by Anchor Academic Publishing (aap_verlag). This book was released on 2014-01-01 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, wind electrical power systems are getting a lot of attention since they are cost competitive, environmentally clean, and safe renewable power source as compared with the fossil fuel and nuclear power generation. A special type of induction generator, called a doubly fed induction generator (DFIG), is used extensively for high-power wind applications. They are used more and more in wind turbine applications due to the ease of controllability, the high energy efficiency, and the improved power quality.This research aims to develop a method of a field orientation scheme for control both, the active and the reactive powers of a DFIG that are driven by a wind turbine. Also, the dynamic model of the DFIG, driven by a wind turbine during grid faults, is analyzed and developed, using the method of symmetrical components. Finally, this study proposes a novel fault ride-through (FRT) capability with a suitable control strategy (i.e. the ability of the power system to remain connected to the grid during faults).
Book Synopsis Ride-Through Fault Capability of Doubly-Fed Induction Wind Generators by : Victor Flores Mendes
Download or read book Ride-Through Fault Capability of Doubly-Fed Induction Wind Generators written by Victor Flores Mendes and published by LAP Lambert Academic Publishing. This book was released on 2016-01-08 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the continuing growth of the installed power capacity of wind farms worldwide, the grid codes define specific requirements to the connection of wind turbines to the grid. One of these requirements is the ride-through fault capability (RTFC), that is, the equipment capability of continuing operating during voltage sags. This book presents the analysis of the behavior of the doubly-fed induction generator technology (DFIG) during balanced and unbalanced voltage sag and proposes novel control strategies to improve the RTFC. The system behavior analysis and the strategies validation are performed using mathematical models in time and frequency domains, simulation results with a Simulink/Matlab model (2MW) and experimental results in two scaled test benches (4kW and 25kW). The limitations for the operation of the strategies are also analyzed. The main objectives of this work are to point the system weaknesses and to contribute to the study of low voltage ride-through strategies (LVRT) of the DFIG technology.
Book Synopsis Enhanced Power Grid Stability Using Doubly Fed Induction Generation by : Kenneth Okedu
Download or read book Enhanced Power Grid Stability Using Doubly Fed Induction Generation written by Kenneth Okedu and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enhanced Power Grid Stability Using Doubly-Fed Induction Generators addresses the latest schemes, modeling, and control strategies for improving variable speed wind turbines. Throughout this book, simulations are carried out using modern software packages to model different types of symmetrical and asymmetrical faults for transient stability analysis and modeling techniques for wind turbine power systems. Key features: --Discusses doubly-fed induction generators, fault ride through, and other concepts for improving stability of power grids --Addresses grid performance-a necessary but often overlooked consideration in renewable power resources --Demonstrates various approaches and appropriate control strategies which can be very effective to stabilize a grid connected wind farm Engineers and professionals involved in the construction and design of power grids and wind farms will find this a valuable resource. This book is also for professors and graduate students in electrical engineering and policy makers and advocates involved in renewable energy.
Book Synopsis A Novel Control Scheme for a Doubly-fed Induction Wind Generator Under Unblanced Grid Voltage Conditions by : Ted Kermit Anderson Brekken
Download or read book A Novel Control Scheme for a Doubly-fed Induction Wind Generator Under Unblanced Grid Voltage Conditions written by Ted Kermit Anderson Brekken and published by . This book was released on 2005 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Novel Robust Control and Fault Ride Through for Wind Turbines with Doubly Fed Induction Generator Operating in Weak Grids by : Manoj Rathi
Download or read book A Novel Robust Control and Fault Ride Through for Wind Turbines with Doubly Fed Induction Generator Operating in Weak Grids written by Manoj Rathi and published by . This book was released on 2005 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improved Indirect Power Control (IDPC) of Wind Energy Conversion Systems (WECS) by : Fayssal Amrane
Download or read book Improved Indirect Power Control (IDPC) of Wind Energy Conversion Systems (WECS) written by Fayssal Amrane and published by Bentham Science Publishers. This book was released on 2019-07-26 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind power capacity in the world has been increased by more than 30% over the last decade in countries which have prominent installations. Wind energy conversion systems (WECSs) based on the doubly-fed induction generator (DFIG) have dominated the wind power generation sector due to the outstanding advantages they provide, including small converter ratings (around 30% of the generator rating) and lower converter costs. Due to the non-linearity of wind power systems, the DFIG power control setup presents a big challenge especially under conditions of high variance in wind-speed and parameter sensing. To overcome these major problems, an improved IDPC (Indirect Power Control) system based on PID (Proportional-Integral-Derivative) controller, has been proposed instead of the conventional power inverters. This handbook covers information about IDPC based WECS. The book starts with a general introduction to wind power system basics. Subsequent chapters provide additional knowledge about robustness tests and adaptive / intelligent control systems employed in wind energy systems. The new concept of direct and quadrature current control (Ird & Irq) under MPPT (Maximum Power Point Tracking) strategy is also explained along with novel fuzzy logic type control systems. The authors have included detailed diagrams and an appendix of WECS parameters, making this handbook a useful primer for engineering students working towards completing licenses, Masters degrees and Post-graduation programs in advanced wind power energy systems.
Book Synopsis Control of Synchronized Doubly-fed Induction Generator Under Grid Conditions by : Nguyen Van Binh
Download or read book Control of Synchronized Doubly-fed Induction Generator Under Grid Conditions written by Nguyen Van Binh and published by . This book was released on 2015 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
