Enhanced Power Grid Stability Using Doubly Fed Induction Generation
Author:
Publisher:
Published: 2020
Total Pages:
ISBN-13:
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Enhanced Power Grid Stability Using Doubly Fed Induction Generation
Author: Kenneth Okedu
Publisher:
Published: 2020
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKEnhanced 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.
Performance of DFIG and PMSG Wind Turbines
Author: Kenneth Okedu
Publisher: CRC Press
Published: 2023-04-05
Total Pages: 235
ISBN-13: 1000856461
DOWNLOAD EBOOKDue to environmental pollution and climate change, the use of renewable energy sources as an alternative means of power generation is on the rise globally. This is because of their clean nature, which makes them ecofriendly with little or no pollution compared to the traditional fossil fuel power-generation power plants. Among the various renewable energy sources, wind energy is one of the most widely employed, due to its promising technology. Wind turbine technologies could be classified into two groups as follows: Fixed Speed Wind Turbines (FSWTs) and Variable Speed Wind Turbines (VSWTs). There have been tremendous improvements in wind turbine technology over the years, from FSWTs to VSWTs, as a result of fast innovations and advanced developments in power electronics. Thus, the VSWTs have better wind energy capture and conversion efficiencies, less acoustic noise and mechanical stress, and better power quality in power grids without support from external reactive power compensators due to the stochastic nature of wind energy. The two most widely employed VSWTs in wind farm development are the Doubly Fed Induction Generator (DFIG) and the Permanent Magnet Synchronous Generator (PMSG) wind turbines. In order to solve transient stability intricacies during power grid faults, this book proposes different control strategies for the DFIG and PMSG wind turbines.
Neural Control of Renewable Electrical Power Systems
Author: Edgar N. Sánchez
Publisher: Springer Nature
Published: 2020-05-09
Total Pages: 206
ISBN-13: 3030474437
DOWNLOAD EBOOKThis book presents advanced control techniques that use neural networks to deal with grid disturbances in the context renewable energy sources, and to enhance low-voltage ride-through capacity, which is a vital in terms of ensuring that the integration of distributed energy resources into the electrical power network. It presents modern control algorithms based on neural identification for different renewable energy sources, such as wind power, which uses doubly-fed induction generators, solar power, and battery banks for storage. It then discusses the use of the proposed controllers to track doubly-fed induction generator dynamics references: DC voltage, grid power factor, and stator active and reactive power, and the use of simulations to validate their performance. Further, it addresses methods of testing low-voltage ride-through capacity enhancement in the presence of grid disturbances, as well as the experimental validation of the controllers under both normal and abnormal grid conditions. The book then describes how the proposed control schemes are extended to control a grid-connected microgrid, and the use of an IEEE 9-bus system to evaluate their performance and response in the presence of grid disturbances. Lastly, it examines the real-time simulation of the entire system under normal and abnormal conditions using an Opal-RT simulator.
Robust Control for Grid Voltage Stability: High Penetration of Renewable Energy
Author: Jahangir Hossain
Publisher: Springer
Published: 2014-07-07
Total Pages: 320
ISBN-13: 9812871160
DOWNLOAD EBOOKThis book makes the area of integration of renewable energy into the existing electricity grid accessible to engineers and researchers. This is a self-contained text which has models of power system devices and control theory necessary to understand and tune controllers in use currently. The new research in renewable energy integration is put into perspective by comparing the change in the system dynamics as compared to the traditional electricity grid. The emergence of the voltage stability problem is motivated by extensive examples. Various methods to mitigate this problem are discussed bringing out their merits clearly. As a solution to the voltage stability problem, the book covers the use of FACTS devices and basic control methods. An important contribution of this book is to introduce advanced control methods for voltage stability. It covers the application of output feedback methods with a special emphasis on how to bound modelling uncertainties and the use of robust control theory to design controllers for practical power systems. Special emphasis is given to designing controllers for FACTS devices to improve low-voltage ride-through capability of induction generators. As generally PV is connected in low voltage distribution area, this book also provides a systematic control design for the PV unit in distribution systems. The theory is amply illustrated with large IEEE Test systems with multiple generators and dynamic load. Controllers are designed using Matlab and tested using full system models in PSSE.
Enhancement of Power System Stability by Using DFIG Based Wind Farm
Author: Md. Rashidul Islam
Publisher: LAP Lambert Academic Publishing
Published: 2014-10-15
Total Pages: 148
ISBN-13: 9783659607387
DOWNLOAD EBOOKDue to random variations of wind speed, output power of a wind turbine generator fluctuates continuously. The power and voltage quality of a wind power system consisting of Induction Generator (IG) based wind turbine (IGWT), IGWT with voltage control device and Doubly Fed Induction Generator (DFIG) based wind turbine (DFIGWT) are presented in this work. Blade pitch angle control to limit the output power at turbine's nominal power is also presented. It is reported that the DFIG-based wind turbine system can smooth the output power and also maintain the terminal voltage at a desired level, as DFIG with two back-to-back voltage source converters that use IGBTs and a capacitor acts as the DC voltage source has real and reactive power control abilities. The comparative results show that DFIGWT-based wind farm (DFIG_WF) has the best response, IGWT-based wind farm (IGWF) with voltage control device has better and IGWF has the worst response. Results indicate that the fluctuation of output power at higher rated rotor speed (near turbine's base wind speed) and terminal voltage are almost nil for DFIG_WF. All the analysis were carried out using SimPowerSystem tool box in MATLAB.
Study of Stability Analysis of a Grid-connected Doubly Fed Induction Generator (DFIG)-based Small Wind Farm
Author: Baishakhi Dhar
Publisher:
Published: 2013
Total Pages:
ISBN-13:
DOWNLOAD EBOOKWind 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.
Enabling Wind Turbine Generators to Participate in Power Grid Frequency Regulation for Enhanced Stability
Author: HongTao Ma
Publisher:
Published: 2008
Total Pages: 132
ISBN-13:
DOWNLOAD EBOOK"This dissertation focuses on wind farm frequency regulation capability to maintain the grid frequency stability. Wind plant power controllers are designed and tested for participation in grid frequency restoration. The small signal stability on sub-optimal operating points is analyzed and a de-loaded operating point is proposed. In the first paper, a new frequency regulation scheme is developed for the wind turbine/generator/converter trio that will provide the capability to participate in restoring frequency in a way similar to the droop response of conventional generators. Output active power adjustment can be realized by both converter and pitch angle control in addition to inertial response of the wind turbine. This helps in maintaining instantaneous power balance as well as in longer term frequency regulation. In the second paper, Inertia controller, pitch angle controller and rotor speed controller are introduced for wind plant output active power adjustment. The control schemes are developed for wind generators to equip them with the capability to participate in restoring gird frequency. With the proposed controllers, the wind plant can operate as a synchronous generator and is able to output larger or smaller amounts of power as required so as to contribute to grid frequency restoration. The controllers are tested on a wind plant operating in a 4-bus test system for verification of the grid frequency performance under various system dynamic conditions. In the third paper, a reduced-3rd order doubly fed induction generator (DFIG) wind turbine dynamic model is described in details. This model along with an active power controller integrated with a power system is investigated for small signal dynamic stability for both sub- and super-synchronous operating conditions. Assuming constant wind speed and blade pitch angle the mechanical power of the machine is modeled as a function of the rotor speed. The system is initialized and linearized around the sub- and super-synchronous operating points. The eigenvalues and participation factors are calculated for a constant power reference as well as 90% P max reference. Both the open loop and closed loop controls on DFIG active power are applied for eigenvalue calculation. The results show that the DFIG operating at the sub-synchronous operating points is unstable"--Abstract, leaf iv.
Wind Power Integration
Author: Brendan Fox
Publisher: IET
Published: 2007-06-20
Total Pages: 290
ISBN-13: 0863414494
DOWNLOAD EBOOKThis essential book examines the main problems of wind power integration and guides the reader through a number of the most recent solutions based on current research and operational experience of wind power integration.
Performance of DFIG and PMSG Wind Turbines
Author: Kenneth E Okedu
Publisher: CRC Press
Published: 2023-04-05
Total Pages: 376
ISBN-13: 1000856607
DOWNLOAD EBOOKDue to environmental pollution and climate change, the use of renewable energy sources as an alternative means of power generation is on the rise globally. This is because of their clean nature, which makes them ecofriendly with little or no pollution compared to the traditional fossil fuel power-generation power plants. Among the various renewable energy sources, wind energy is one of the most widely employed, due to its promising technology. Wind turbine technologies could be classified into two groups as follows: Fixed Speed Wind Turbines (FSWTs) and Variable Speed Wind Turbines (VSWTs). There have been tremendous improvements in wind turbine technology over the years, from FSWTs to VSWTs, as a result of fast innovations and advanced developments in power electronics. Thus, the VSWTs have better wind energy capture and conversion efficiencies, less acoustic noise and mechanical stress, and better power quality in power grids without support from external reactive power compensators due to the stochastic nature of wind energy. The two most widely employed VSWTs in wind farm development are the Doubly Fed Induction Generator (DFIG) and the Permanent Magnet Synchronous Generator (PMSG) wind turbines. In order to solve transient stability intricacies during power grid faults, this book proposes different control strategies for the DFIG and PMSG wind turbines.
