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Grid Connected Doubly Fed Induction Generator Wind Energy Conversion System Using Fuzzy Controller
Pooja Dewangan,,Prof. S. D. Bharti
International Journal of Innovative Technology and Exploring Engineering , 2013,
Abstract: This paper presents the simulation and control of a grid connected doubly-fed induction generator driven by a variable speed wind turbine. Fuzzy logic control strategy is applied to doubly fed induction generator (DFIG). The Matlab/Simulink/SimPowerSystems software is used to Simulate all the components of grid connected doubly fed induction generator (DFIG)-based wind power conversion system (WPCS). DFIG consists of a common wound rotor induction generator with slip ring and a back to back voltage source convertor. Fuzzy logic controller is applied to both grid side convertor (GSC) for dc link voltage control and rotor side convertor (RSC) for active and reactive power control. Coordinated control of the grid- and rotor side converters (GSC and RSC, respectively) is presented in the positive synchronous reference. Use of DFIG in wind turbine is widely spreading due to its control over DC voltage and active and reactive power. Conventional dq axis current control using voltage source converters for both the grid side and the rotor side of the DFIG are analyzed and simulated. Simulation results prove the excellent performance of fuzzy control unit as improving power quality and stability of wind turbine.
Control of Doubly Fed Induction Generator Supplied via Matrix Converter for Wind Energy Conversion System  [PDF]
Zakaria Kara, Kamel Barra
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2014, DOI: 10.4236/ijmnta.2014.33012
Abstract:

The present paper deals with the modeling and control of Wind Energy Conversion System WECS based Doubly Fed Induction Generator DFIG using the slip energy recovery principle. The proposed drive system uses a Matrix Converter (MC) to transfer the slip energy of the rotor into the mains instead of using cascaded ac-dc-ac converter whilst the stator side is fixed to the grid. Operation at both sub-synchronous and super-synchronous regions is possible with the proposed drive system. The different level control strategies for maximum power point tracking and active-reactive power are discussed. Simulation results of the proposed doubly fed induction generator drive system show the good performance of the control system strategy for both transient and steadystate conditions.

Control of Doubly-Fed Induction Generator System for Wind Turbines
Viorica Spoial?,Helga Silaghi,Drago? Spoial?
Journal of Computer Science and Control Systems , 2008,
Abstract: The paper realizes the analysis, modelling and control of the doubly-fed induction generator (DFIG) for wind turbines. Different control methods are investigated with the objective of eliminating the influence of the back electromotive force (EMF), which is that of, in control terminology, a load disturbance, on the rotor current.
Overview of Wind Turbine Driven Self-Excited Induction Generator
Haval Sardar Kamil,Prof.(Mrs.) S. U. Kulkarni
International Journal of Innovative Technology and Exploring Engineering , 2013,
Abstract: this paper presents an overview of the analysis, modeling as well as controlling of self Excited Induction Generator (SEIG) which is connected by Wind Turbine. The AC capacitors are used to build up the process of an isolated induction generator starts from charge in the capacitors or from a remnant magnetic field in the core. Same process is done at the time of isolated induction generator is excited by inverter/rectifier system. . A closed loop voltage control scheme using a PWM Voltage Source Converter (VSC), dc link capacitor and a P-I voltage controller is proposed. This scheme generates constant voltage and variable frequency using the converter which also acts as a reactive power compensator. In the growing applications and environmental conditions, various types of technologies are introduced to delivering the power to the grid. The main objective of the project is to track and extract maximum power to the grid connected wind energy conversion system. This paper presents only a proposed approach of self-excited induction generator in wind energy conversion system.
Technology of VAr Compensators for Induction Generator Applications in Wind Energy Conversion Systems  [PDF]
A. F. Zobaa,K. A. Nigim,R. C. Bansal
Journal of Electrical Systems , 2006,
Abstract: Many of today utility interconnected wind farms use induction generator (IG) to convert the captured wind mechanical power into electricity. Induction generator has some advantages over the synchronous generator (SG). The main advantages are its robustness and its capability to be synchronized directly to the grid. The main disadvantage, however, is its dependency on the grid for supplying its own reactive power ‘VAr’. Whether fixed or adjustable VAr systems are connected across its terminal, IG must operate at unity power factor at the rated loading while the wind power varies. With supervised control and appropriate coordination, VAr can be used to the benefits of both the wind farm developer and the hosting utility. The incorporation of today adjustable reactive power compensators such as the Static VAr Compensation (SVC) and Static Synchronous Compensator (STATCOM) with IG are vital ingredient toward a successful penetration of wind energy in today distribution grid to ensure voltage stability during the steady state and transient periods.
Investigation on the Excitation Capacitor for a Wind Pumping Plant Using Induction Generator  [PDF]
Manel Ouali, Mohamed Ben Ali Kamoun, Maher Chaabene
Smart Grid and Renewable Energy (SGRE) , 2011, DOI: 10.4236/sgre.2011.22014
Abstract: This paper presents a SEIG-IM system using a self excited induction generator driven by wind turbine and supplying an induction motor which is coupled to a centrifugal pump. A method to describe the steady state performance based on nodal analysis is presented. Furthermore, a dynamic analysis and performance characteristics are examined. The pro-posed methodology is discussed in order to optimize the quantity of the pumped water. Therefore an optimal excitation capacitor for a given wind rotor speed is determined and a suitable operation mode of the system is established.
Wind driven Induction Generator with Vienna Rectifier and PV for Hybrid Isolated Generations
Dr.S.Singaravelu,G.Balasubramaniaan
International Journal of Recent Technology and Engineering , 2013,
Abstract: Hybrid PV-wind generation shows higher availability as compared to PV or wind alone. For rural electrifications, researches are focused on hybrid power system which provides sustainable power. The variable voltage and frequency of the self excited induction generator (SEIG) is rectified through Vienna rectifier (three switches) to the required D.C voltage level and fed to common D.C bus. The variable output voltage of PV module is controlled by DC/DC converter using proposed fuzzy logic controller and fed to common D.C bus. The DC bus collects the total power from the wind and photovoltaic system and used to charge the battery as well as to supply the A.C loads through inverter. A dynamic mathematical model and MATLAB simulations for the entire scheme is presented. Results from the simulations and experimental tests bring out the suitability of the proposed hybrid scheme in remote areas.
Steady State Analysis of a Doubly Fed Induction Generator  [PDF]
Ahmad M. Alkandari, S. A. Soliman, Mansour H. Abdel-Rahman
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.34050
Abstract: In this paper, we present the steady state analysis of a double-fed induction generator (DFIG) adopted for wind power generation. The three-phase induction machine connected to the network, to work as a generator for wind farms, is excited on the rotor circuit by a slip-frequency current injected to the rotor, from an exciter mounted on the same shaft of the machine. The resulting rotating magnetic field rotates at synchronous speed; as such the generated power has a constant frequency independent of the shaft speed. Effects of the excitation voltage magnitude and phase angle on the active and reactive power are studied, when the machine runs at constant speed. It has been shown that by controlling the excitation voltage magnitude and phase angle would control the mode of operation of the machine; motor mode or generator mode. Furthermore, the effects of the shaft speed on the active and reactive power at constant excitation voltage magnitude and constant phase angle are also investigated.
Isolated MicroGrid’s Voltage and Frequency Characteristic with Induction Generator Based Wind Turbine  [PDF]
Woo-Kyu Chae, Hak-Ju Lee, Sung-Wook Hwang, Il-Keun Song, Jae-Eon Kim
Smart Grid and Renewable Energy (SGRE) , 2014, DOI: 10.4236/sgre.2014.57017
Abstract:

To save on the island area's power supply cost and protect the clean environment, the Isolated MicroGrid is being duly considered. Consisting of the Wind Turbine Generator (WT), photovoltaic generator, battery system, back-up diesel generator, etc., Isolated MicroGrid, which usually uses the inverter to maintain voltage and frequency of the system, is very weak in terms of voltage and frequency stability compared to the large-scale electrical power system. If wind turbine generator is applied to this weak power system, it could experience many problems in terms of maintaining its voltage and frequency. In this paper, the measurement result of voltage and frequency is presented for MicroGrid, which consists of the Wind Turbine Generator adopting the induction generator and the battery system. MicroGrid’s voltage waveform distortion and Wind Turbine Generator’s output oscillation problems are analyzed using PSCAD/EMTDC. Based on the analyzed result, the importance of type and capacity choice has been suggested in case the Wind Turbine Generator is applied to the Isolated MicroGrid.

Application of STATCOM and CROWBAR for Transient Stability Improvement and Performance Enhancement for A Wind Turbine Based Doubly Fed Induction Generator  [PDF]
CH.AppalaNarayana,D.V.N.Ananth,S. Saikiran,I. Prasanna Kumar
International Journal of Soft Computing & Engineering , 2013,
Abstract: This paper presents a robust control of Doubly FedInduction Generator (DFIG) wind turbine in a sample powersystem. DFIG consists of a common induction generator with slipring and a partial scale power electronic converter. Indirect fieldorientedcontroller is applied to rotor side converter for activepower control and voltage regulation of wind turbine. On gridside PQ control scheme is applied. Wind turbine and its controlunits are described in details and also for STATCOM control. Allpower system components are simulated in MATLAB/SIMULINK software. For studying the performance ofcontroller, different abnormal conditions are applied even theworst case. Simulation results prove that the performance ofSTATCOM and DFIG control schemes as improving powerquality and stability of wind turbine.
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