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Modeling And Analysis Of Doubly Fed Induction Generator Wind Energy Systems

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Modeling and Analysis of Doubly Fed Induction Generator Wind Energy Systems

Modeling and Analysis of Doubly Fed Induction Generator Wind Energy Systems Book
Author : Lingling Fan,Zhixin Miao
Publisher : Academic Press
Release : 2015-04-16
ISBN : 0128029862
Language : En, Es, Fr & De

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Book Description :

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

Advanced Control of Doubly Fed Induction Generator for Wind Power Systems

Advanced Control of Doubly Fed Induction Generator for Wind Power Systems Book
Author : Dehong Xu,Frede Blaabjerg,Wenjie Chen,Nan Zhu
Publisher : John Wiley & Sons
Release : 2018-08-14
ISBN : 1119172063
Language : En, Es, Fr & De

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Book Description :

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.

Doubly Fed Induction Machine

Doubly Fed Induction Machine Book
Author : Gonzalo Abad,Jesus Lopez,Miguel Rodriguez,Luis Marroyo,Grzegorz Iwanski
Publisher : John Wiley & Sons
Release : 2011-09-28
ISBN : 1118104951
Language : En, Es, Fr & De

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Book Description :

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.

Modeling and Analysis of Variable Reactive Power Limits of a Doubly Fed Induction Generator DFIG Used in Variable Speed Wind Turbines

Modeling and Analysis of Variable Reactive Power Limits of a Doubly Fed Induction Generator  DFIG  Used in Variable Speed Wind Turbines Book
Author : Jonathan Devadason
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

In this thesis, the mathematical modeling of variable reactive power limits for a Doubly Fed Induction Generator (DFIG) based on its capability curves is presented. Reactive power limits have been adjusted dynamically based on the capability curves when the system was subjected to a disturbance. This ensures that the operation of the DFIG is always within safe limits and utilizes the available capability of the DFIG to improve the performance of the system. The small signal stability of the system is studied by considering the load as a variable parameter. The differential-algebraic model of the DFIG, synchronous generators and their associated controllers and the power system network is linearized and bifurcation analysis considering the load as the bifurcation parameter has been performed. The PV curves, the stator and rotor current magnitudes, and the eigenvalue trajectories are plotted as the load is varied. Time domain simulations are performed to observe the change in stator and rotor currents when the system is subjected to a load change and a change in the wind speed. The system considered for testing is the IEEE 9 bus system which is modified to include a wind farm consisting of 5 wind turbines. The variable reactive power limits are implemented in the reactive power controller of the DFIG and the performance of the system is compared to that of the system with fixed limits in the reactive power controller. From the bifurcation analysis, it was observed that the stator and rotor currents were at the maximum limits when the lower and upper limits of the controller were reached. Also, the Hopf bifurcation was found to occur at a lower load level compared to the system with fixed reactive power limits. From the time domain simulations, it was observed that the stator and rotor currents did not exceed the maximum limits in the system with variable reactive power limits when the system was subjected to a change in the load and a change in the wind speed. Hence, the problem of over/under estimating the reactive power capability of the DFIG based wind farm was avoided.

Analysis of Sub synchronous Resonance SSR in Doubly fed Induction Generator DFIG Based Wind Farms

Analysis of Sub synchronous Resonance  SSR  in Doubly fed Induction Generator  DFIG  Based Wind Farms Book
Author : Hossein Ali Mohammadpour,Enrico Santi
Publisher : Morgan & Claypool Publishers
Release : 2015-09-01
ISBN : 1627058079
Language : En, Es, Fr & De

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Book Description :

Wind power penetration is rapidly increasing in today's energy generation industry. In particular, the doubly-fed induction generator (DFIG) has become a very popular option in wind farms, due to its cost advantage compared with fully rated converter-based systems. Wind farms are frequently located in remote areas, far from the bulk of electric power users, and require long transmission lines to connect to the grid. Series capacitive compensation of DFIG-based wind farm is an economical way to increase the power transfer capability of the transmission line connecting the wind farm to the grid. For example, a study performed by ABB reveals that increasing the power transfer capability of an existing transmission line from 1300 MW to 2000 MW using series compensation is 90% less expensive than building a new transmission line. However, a factor hindering the extensive use of series capacitive compensation is the potential risk of subsynchronous resonance (SSR). The SSR is a condition where the wind farm exchanges energy with the electric network, to which it is connected, at one or more natural frequencies of the electric or mechanical part of the combined system, comprising the wind farm and the network, and the frequency of the exchanged energy is below the fundamental frequency of the system. This oscillatory phenomenon may cause severe damage in the wind farm, if not prevented. Therefore, this book studies the SSR phenomenon in a capacitive series compensated wind farm. A DFIG-based wind farm, which is connected to a series compensated transmission line, is considered as a case study. The book consists of two main parts: Small-signal modeling of DFIG for SSR analysis: This part presents a step-by-step tutorial on modal analysis of a DFIG-based series compensated wind farm using Matlab/Simulink. The model of the system includes wind turbine aerodynamics, a 6th order induction generator, a 2nd order two-mass shaft system, a 4th order series compensated transmission line, a 4th order rotor-side converter (RSC) controller and a 4th order grid-side converter (GSC) controller, and a 1st order DC-link model. The relevant modes are identified using participation factor analysis. Definition of the SSR in DFIG-based wind farms: This part mainly focuses on the identification and definition of the main types of SSR that occur in DFIG wind farms, namely: (1) induction generator effect (SSIGE), (2) torsional interactions (SSTI), and (3) control interactions (SSCI).

Modeling Analysis and Enhancement of the performance of a Wind Driven DFIG During steady state and transient conditions

Modeling  Analysis and Enhancement of the performance of a Wind Driven DFIG During steady state and transient conditions Book
Author : Mohmoud Mossa
Publisher : Anchor Academic Publishing (aap_verlag)
Release : 2014-02-01
ISBN : 3954896397
Language : En, Es, Fr & De

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Book Description :

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).

Power Conversion and Control of Wind Energy Systems

Power Conversion and Control of Wind Energy Systems Book
Author : Bin Wu,Yongqiang Lang,Navid Zargari,Samir Kouro
Publisher : John Wiley & Sons
Release : 2011-09-26
ISBN : 1118028988
Language : En, Es, Fr & De

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Book Description :

The book presents the latest power conversion and control technology in modern wind energy systems. It has nine chapters, covering technology overview and market survey, electric generators and modeling, power converters and modulation techniques, wind turbine characteristics and configurations, and control schemes for fixed- and variable-speed wind energy systems. The book also provides in-depth steady-state and dynamic analysis of squirrel cage induction generator, doubly fed induction generator, and synchronous generator based wind energy systems. To illustrate the key concepts and help the reader tackle real-world issues, the book contains more than 30 case studies and 100 solved problems in addition to simulations and experiments. The book serves as a comprehensive reference for academic researchers and practicing engineers. It can also be used as a textbook for graduate students and final year undergraduate students.

Advanced Control of Variable Speed Wind Turbine Based on Doubly fed Induction Generator

Advanced Control of Variable Speed Wind Turbine Based on Doubly fed Induction Generator Book
Author : Lei Wang
Publisher : Unknown
Release : 2012
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

This thesis deals with the modeling, control and analysis of doubly fed induction generators (DFIG) based wind turbines (DFIG-WT). The DFIG-WT is one of the mostly employed wind power generation systems (WPGS), due to its merits including variable speed operation for achieving the maximum power conversion, smaller capacity requirement for power electronic devices, and full controllability of active and reactive powers of the DFIG. The dynamic modeling of DFIG-WT has been carried out at first in Chapter 2, with the conventional vector control (VC) strategies for both rotor-side and grid-side converters. The vector control strategy works in a synchronous reference frame, aligned with the stator-flux vector, became very popular for control of the DFIG. Although the conventional VC strategy is simple and reliable, it is not capable of providing a satisfactory transient response for DFIG-WT under grid faults. As the VC is usually designed and optimized based on one operation point, thus the overall energy conversion efficiency cannot be maintained at the optimal point when the WPGS operation point moves away from that designed point due to the time-varying wind power inputs. Compared with VC methods which are designed based on linear model obtained from one operation point, nonlinear control methods can provide consistent optimal performance across the operation envelope rather than at one operation point. To improve the asymptotical regulation provided by the VC, which can't provide satisfactory performance under voltage sags caused by grid faults or load disturbance of the grid, input-output feedback linearization control (IOFLC) has been applied to develop a fully decoupled controller of the active $\&$ reactive powers of the DFIG in Chapter 3. Furthermore, a cascade control strategy is proposed for power regulation of DFIG-WT, which can provide better performance against the varying operation points and grid disturbance. Moreover, to improve the overall energy conversion efficiency of the DFIG-WT, FLC-based maximum power point tracking (MPPT) has been investigated. The main objective of the FLC-based MPPT in Chapter 4 is to design a global optimal controller to deal with the time-varying operation points and nonlinear characteristic of the DFIG-WT. Modal analysis and simulation studies have been used to verify the effectiveness of the FLC-based MPPT, compared with the VC. The system mode trajectory, including the internal zero-dynamic of the FLC-MPPT are carefully examined in the face of varied operation ranges and parameter uncertainties. In a realistic DFIG-WT, the parameter variability, the uncertain and time-varying wind power inputs are existed. To enhance the robustness of the controller, a nonlinear adaptive controller (NAC) via state and perturbation observer for feedback linearizable nonlinear systems is applied for MPPT control of DFIG-WT in Chapter 5. In the design of the controller, a perturbation term is defined to describe the combined effect of the system nonlinearities and uncertainties, and represented by introducing a fictitious state in the state equations. As follows, a state and perturbation observer is designed to estimate the system states and perturbation, leading to an adaptive output-feedback linearizing controller which uses the estimated perturbation to cancel system perturbations and the estimated states to implement a linear output feedback control law for the equivalent linear system. Case studies including with and without wind speed measurement are carried out and proved that the proposed NAC for MPPT of DFIG-WT can provide better robustness performance against the parameter uncertainties. Simulation studies for demonstrating the performance of the proposed control methods in each chapter, are carried out based on MATLAB/SIMULINK.

Modeling and Analysis with Induction Generators Third Edition

Modeling and Analysis with Induction Generators  Third Edition Book
Author : M. Godoy Simões,Felix A. Farret
Publisher : CRC Press
Release : 2014-12-11
ISBN : 1482244675
Language : En, Es, Fr & De

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Book Description :

Now in its Third Edition, Alternative Energy Systems: Design and Analysis with Induction Generators has been renamed Modeling and Analysis with Induction Generators to convey the book’s primary objective—to present the fundamentals of and latest advances in the modeling and analysis of induction generators. New to the Third Edition Revised equations and mathematical modeling Addition of solved problems as well as suggested problems at the end of each chapter New modeling and simulation cases Mathematical modeling of the Magnus turbine to be used with induction generators Detailed comparison between the induction generators and their competitors Modeling and Analysis with Induction Generators, Third Edition aids in understanding the process of self-excitation, numerical analysis of stand-alone and multiple induction generators, requirements for optimized laboratory experimentation, application of modern vector control, optimization of power transference, use of doubly fed induction generators, computer-based simulations, and social and economic impacts.

Doubly fed Induction Generator Based Wind Power Plant Models

Doubly fed Induction Generator Based Wind Power Plant Models Book
Author : Keith Joseph Faria
Publisher : Unknown
Release : 2009
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

This thesis describes the generic modeling of a Doubly-Fed Induction Generator (DFIG) based wind turbine. The model can also represent a wind plant with a group of similar wind turbines lumped together. The model is represented as a controlled current source which injects the current needed by the grid to supply the demanded real and reactive power. The DFIG theory is explained in detail as is the rationale for representing it by a regulated current source. The complete model is then developed in the time-domain and phasor domain by the interconnection of various sub-systems, the functions of which have been described in detail. The performance of the model is then tested for steady-state and dynamic operation. The model developed can be used for bulk power system studies and transient stability analysis of the transmission system. This thesis uses as its basis a report written for NREL (1).

Control Design and Analysis of Doubly fed Induction Generator in Wind Power Application

Control Design and Analysis of Doubly fed Induction Generator in Wind Power Application Book
Author : Shukul Mazari
Publisher : Unknown
Release : 2009
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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.

Modeling Control and Analysis of a Doubly Fed Induction Generator Based Wind Turbine System with Voltage Regulation

Modeling  Control and Analysis of a Doubly Fed Induction Generator Based Wind Turbine System with Voltage Regulation Book
Author : Bijaya Pokharel
Publisher : Unknown
Release : 2011
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Modeling Control and Analysis of a Doubly Fed Induction Generator Based Wind Turbine System with Voltage Regulation book written by Bijaya Pokharel, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Modeling Control and Maximum Power Point Tracking MPPT of Doubly fed Induction Generator DFIG Wind Power System

Modeling  Control and Maximum Power Point Tracking  MPPT  of Doubly fed Induction Generator  DFIG  Wind Power System Book
Author : Yu Zou
Publisher : Unknown
Release : 2012
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Wind power is the fastest growing renewable energy and is promising to be the number one source of clean energy in the near future. Among various generators used to convert wind energy, the Doubly-Fed Induction Generator (DFIG) has attracted more attention due to its variable speed, higher energy capture efficiency and improved power quality. The DFIG system has back-to-back converters, one on the rotor side and one on the stator side. The two converters act as an optimal operation tracking interface between the generator and the grid or other loads. To achieve the desirable output power, field oriented control (FOC) or vector control is applied to both the rotor- and the stator-side converters. To achieve high efficiency in wind power systems, the maximum power point tracking (MPPT) of the variable-speed operation has attracted a lot of attention. Most MPPT methods either rely on wind speed measurement or on complicated estimations and online calculations. As a result, these methods are either expensive due to the need of wind speed sensors or suffer from inaccuracy due to variations of wind turbine system models. This dissertation proposes a novel self-tuning reference power MPPT curve. This reference power curve is simply updated by incrementally updating the curve coefficients. The method is robust and is independent of the wind turbine model. Also, regarding MPPT stability, this dissertation presents the steady state and dynamic analyses of this MPPT method. A single-pole transfer function that describes the effect of variations of wind speed on the rotor speed is obtained by applying small signal analysis on the turbine-rotor mechanical system. To verify the wind power control system and the proposed MPPT analysis, both simulation and experimental platforms are developed. First, the DFIG system, including a wind turbine, a generator, power electronic converters and power system grid are modeled. All of the control algorithms and operation modes are simulated. The active power is always controlled at maximum output while the reactive power is controlled to achieve a particular power factor or line voltage. Second, a complete DFIG wind power test bench including a wind turbine emulator is designed and built. The back-to-back converters are designed to control the DFIG. A Microchip dsPIC33 is used to control both turbine emulator and the converters. The utility grid integration is implemented with assistance of a Phase Locked Loop (PLL) and the rotor currents of DFIG are controlled to vary the operation point. Then, the proposed MPPT is simulated and incremental current control is implemented for optimal power tracking. The incremental change is not stopped until the optimal output power is reached. Also, both simulation and experimental results confirm the dynamic behavior of rotor speed predicted by the proposed transfer function. The real-time close-loop power control and Fault Ride Through (FRT) could be studied in the future based on the developed simulation and experimental systems. While the test bench is designed to flexibly fitting future wind research, more programming efforts are required to implement more complicated algorithms.

Doubly Fed Induction Generators

Doubly Fed Induction Generators Book
Author : Edgar N. Sanchez,Riemann Ruiz-Cruz
Publisher : CRC Press
Release : 2016-08-05
ISBN : 1315351730
Language : En, Es, Fr & De

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Book Description :

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.

Study of Stability Analysis of a Grid connected Doubly Fed Induction Generator DFIG based Small Wind Farm

Study of Stability Analysis of a Grid connected Doubly Fed Induction Generator  DFIG  based Small Wind Farm Book
Author : Baishakhi Dhar
Publisher : Unknown
Release : 2013
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Wind is the most reliable, clean and fast-developing renewable energy source. The DFIG-based variable speed wind turbine system is now the most popular in wind power industry. With power being so in-demanding, a large wind farm needs to be developed to produce more power from a stable system. But before such a large wind farm is installed, better understanding is needed of the system's intrinsic dynamic behavior, range of stability region and parametric effects on system stability. Hence, a small wind farm with two identical DFIG-based wind turbines connected to a grid network has been considered for this study. A detailed non-linear mathematical model of grid-connected single DFIG-based wind turbine system as well as a grid-connected multi DFIG-based wind turbine system in a dq-frame has been developed. Linearization of these non-linear mathematical models for both the systems has been performed from the set of developed non-linear equations. These two linearized dynamic models provide an analytical platform for determining the robustness and stability of the two systems. The linearized models are then verified with the simulation results of non-linear systems designed in a PSCAD/EMTDC environment. This step is needed to check the performance accuracy of the linearized models. The small-signal stability, the system's parametric effects on stability and the modal analysis of two developed linearized models have been studied. Participation factor analysis has been employed to determine system parametric effects on each eigenmode. The intrinsic dynamic behavior of a single wind turbine connected to a grid and multi wind turbines connected to a grid (a small wind farm) are observed to be identical in nature at the same operating conditions and system parameters.

Wind Power and Analysis of Squirrel Cage Induction Generator Based Wind Farm

Wind Power and Analysis of Squirrel Cage Induction Generator Based Wind Farm Book
Author : Shripad Desai
Publisher : GRIN Verlag
Release : 2018-09-11
ISBN : 3668795290
Language : En, Es, Fr & De

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Book Description :

Master's Thesis from the year 2018 in the subject Engineering - Power Engineering, grade: 9, , language: English, abstract: The rising demand of electricity and the environmental concern in the recent past necessities the need of renewable energy sources. The Renewable energy sources have gained major importance due to the depletion of the conventional fuels in the future. Among the available renewable sources the Wind energy has gained a significant importance due to its high efficiency and pollution free nature. Large Wind Farms have been set up to meet the energy demand globally. The capacity of the Wind Turbine Generator is being increased gradually from a few KW capacities in the beginning rising up to almost 5 MW in the present. More research has to be carried in this field to make it a dominant source for the rising energy demand. Wind energy potential has to be harnessed on a large scale in places which have high wind density. Before the actual commissioning of the Wind Farm on site, a wide range of analysis has to be carried in terms of simulation. This is done to understand the behavior of the system under various conditions and preventive actions if any are to be taken. The pre analysis gives us an idea of the selection of devices for higher efficiency and system reliability. This project is a research work carried in ETAP (Electrical Transient Analyzer Program), which is a Power System Simulation tool. The analysis carried out to demonstrate the capabilities of the SCIG (Squirrel Cage Induction Generator) based Wind Farm include Load Flow analysis, to find out the Power transferred to the Grid in normal condition at rated Wind Speed. Active Power Output at various Wind Speeds, which presents the efficiency of the Wind Farm at various range of wind speeds. Short Circuit analysis which is essential to determine the capability of the Wind Farm to recover from any abnormal conditions. Harmonic analysis to determine the Quality of power being delivered and the Harmonic Filter design to mitigate the Harmonic content if any in excess.Reactive Power analysis which is important considering the stability of the system and a suitable Capacitor design for reactive Power compensation. The WTG (Wind Turbine Generator) considered was a Type 2 Variable speed SCIG of 2.1 MW assigned in ETAP. The Wind Farm consisted of a total of 20 WTG’s with a total capacity of 42 MW. The results obtained were compared with the theoretical values and were found to be the same. The analysis performed presented a clear indication of the future of Wind Energy in SCIG based Wind Farms.

Wind Driven Doubly Fed Induction Generator

Wind Driven Doubly Fed Induction Generator Book
Author : Adel Abdelbaset,Yehia S. Mohamed,Abou-Hashema M. El-Sayed,Alaa Eldin Hussein Abozeid Ahmed
Publisher : Springer
Release : 2017-10-30
ISBN : 3319701088
Language : En, Es, Fr & De

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Book Description :

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.

Implementation of Wind Energy Systems to the Existing Power Grid

Implementation of Wind Energy Systems to the Existing Power Grid Book
Author : Jalaja Gogineni,Cullen College of Engineering. Department of Electrical and Computer Engineering
Publisher : Unknown
Release : 2012
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Steady state and transient analysis of a Doubly Fed Induction Generator(DFIG) belonging to a Wind Power Generator is performed. Firstly, the steady state model of the DFIG is derived, and based on the DFIG characteristics, its steady state operating condition is determined. Also, the control strategies that determine the gating signals to the Back to Back Converter (BBC) are described. Secondly, the transient model of the DFIG is derived, and its transient characteristics are analyzed and simulated for a three phase metallic fault. The results of the transient analysis are obtained using both the analytical model and DFIG wind turbine model in Matlab/Simulink software. The study shows the significance of protecting the Back to Back converter during the occurrence of a fault.

DFIG based Wind Power Conversion System Connected to Grid

DFIG based Wind Power Conversion System Connected to Grid Book
Author : Akshay Kumar
Publisher : GRIN Verlag
Release : 2014-08-14
ISBN : 3656720169
Language : En, Es, Fr & De

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Book Description :

Master's Thesis from the year 2014 in the subject Engineering - Power Engineering, grade: 7.8, Ajay Kumar Garg Engineering College, course: M.Tech, language: English, abstract: Wind generation has become the most important alternate energy source and has experienced increased progress in India during the past decade. While it has great potential as an alternative to less environmentally friendly energy sources, there are various technical challenges that cause wind to be considered negatively by many utilities. Wind energy conversion systems suffer from the fact that their real power generation is closely dependent on the local environmental conditions. The Doubly Fed Induction Generator (DFIG) based wind turbine with variable-speed variable-pitch control scheme is the most popular wind power generator in the wind power industry. This machine can be operated either in grid connected or standalone mode. In this thesis, a detailed electromechanical model of a DFIG-based wind turbine connected to power grid as well as separately operated wind turbine system with different sub-systems is developed in the MATLAB/SIMULINK environment and its equivalent generator and turbine control structure is realized. In this regard following configurations have been considered: • DFIG with Battery storage sub-system • DFIG with Buck-Boost converter • DFIG with transformer • DFIG with 3-winding transformer Addition of battery storage and buck-boost converter sub-systems into the system enables not only dispatching of generator power but also decreases the variability in their reactive power requirements. The full control over both active and reactive power is possible by the use of transformer between DFIG and rotor side converter. The steady state behavior of the overall wind turbine system is presented and the steady state reactive power ability of the DFIG is analyzed. It has been shown that major part of the reactive power should be supplied from rotor side converter to reduce the overall rating of the generator. The DFIG with above mentioned sub-systems is connected to grid. The total harmonic distortion analysis and efficiency are carried out. It is found that DFIG with transformer in between machine and rotor side converter has lowest THD (2.29%) and DFIG with 3-winding transformer has maximum efficiency (above 93%).

Integration of Large Scale Wind Energy with Electrical Power Systems in China

Integration of Large Scale Wind Energy with Electrical Power Systems in China Book
Author : Zongxiang Lu,Shuangxi Zhou
Publisher : John Wiley & Sons
Release : 2018-06-11
ISBN : 1118910001
Language : En, Es, Fr & De

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Book Description :

An in-depth examination of large scale wind projects and electricity production in China Presents the challenges of electrical power system planning, design, operation and control carried out by large scale wind power, from the Chinese perspective Focuses on the integration issue of large scale wind power to the bulk power system, probing the interaction between wind power and bulk power systems Wind power development is a burgeoning area of study in developing countries, with much interest in offshore wind farms and several big projects under development English translation of the Chinese language original which won the "Fourth China Outstanding Publication Award nomination" in March 2013