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Multidisciplinary Constrained Optimization of Power Quality in Doubly Fed Wind Turbine Induction Generator  [PDF]
Seyed Javad Fattahi, Abolghasem Zabihollah
Modern Mechanical Engineering (MME) , 2013, DOI: 10.4236/mme.2013.32013

Shape optimization of turbine blade to maximize the output power usually changes the power factor due to compensate Repower in a wind turbine. This article presents a multidisciplinary optimization technique to maximize the output power in Doubly Fed Induction Generator (DFIG) wind turbine. The most common parameters when operating the turbine, namely, active power, reactive power and power factor, are considered as the problem constraints and the pitch angle grid side variable frequency converter of the turbine blades are optimized to maximize the output power. Numerical simulation has been illustrated to present the performance of the proposed design approach.

Multi-Machine Power Stabilization Controller (MMPSC) for Power Quality Applications  [PDF]
D. Sabapathi, R. Anita
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.710250
Abstract: Power system stability control is a challenging task in power generation, transmission and distributions based applications and in many fields. Multi-machine power compensation control can achieve system stabilization within a prescribed time in conventional controller. However, limited time control cannot guarantee the system convergence within particular time independent on the initial condition, which makes illegal application into the practical system if the initial condition is unknown in advance. The proposed Multi-Machine Power System Compensation (MMPSC) control overcomes the issues in existing systems and limited time stability controller. Due to this attractive solution, multi-machine power compensation control stability has found applications in uniform exact differentiator design for the multi-agent system. The proposed multi-machine power compensation control reduces damping oscillation and improves the power system stability control. The main objective of proposed controller is to improve the stability of MMPSC limited time system stabilization independent of the initial state and ensure fast convergence both far away from and at a close range of the power monitoring system. This feature can reduce the loss caused by unwanted oscillation and avoid voltage collapse. To overcome the linearity problem of terminal mode control, saturation function is introduced to limit the amplitude of power input. In comparison with the existing results on stability control, the proposed MMPSC applies a simpler method to overcome stability problem and achieves higher efficiency.
Transient Response Improvement of Microgrids Exploiting the Inertia of a Doubly-Fed Induction Generator (DFIG)
Christina N. Papadimitriou,Nicholas A. Vovos
Energies , 2010, DOI: 10.3390/en30601049
Abstract: Storage devices are introduced in microgrids in order to secure their power quality, power regularity and offer ancillary services in a transient period. In the transition period of a low voltage microgrid, from the connected mode of operation to the islanded mode of operation, the power unbalance can be partly covered by the inertia energy of the existing power sources. This paper proposes fuzzy local controllers exploiting the inertia of a Wind Turbine (WT) with a Doubly Fed Induction Generator (DFIG), if such a machine exists in the microgrid, in order to decrease the necessary storage devices and the drawbacks that arise. The proposed controllers are based in fuzzy logic due to the non linear and stochastic behavior of the system. Two cases are studied and compared during the transient period where the microgrid architecture and the DFIG controller differ. In the first case, the understudy microgrid includes a hybrid fuel cell system (FCS)-battery system and a WT with a DFIGURE. The DFIG local controller in this case is also based in fuzzy logic and follows the classical optimum power absorption scenario for the WT. The transition of the microgrid from the connected mode of operation to the islanded mode is evaluated and, especially, the battery contribution is estimated. In the second case, the battery is eliminated. The fuzzy controller of the DFIG during the transition provides primary frequency control and local bus voltage support exploiting the WT inertia. The response of the system is estimated in both cases using MATLAB/Simulink software package.
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.
Small Signal Stability Analysis for a DFIG-Based Offshore Wind Farms Collected Through VSC-HVDC Transmission System  [PDF]
Kai Liao, Zhengyou He, Bin Sun, Yong Jia
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B083
Abstract: This paper modeled a doubly fed induction generator (DFIG) - based offshore wind farm integrated through a voltage source converter –based high voltage direct current (VSC-HVDC) transmission system, which is collected with infinite bus for small signal stability analysis. The control system of HVDC system is considered for the stability analysis. The impact of the VSC control parameters on the network stability is studied. The lineared dynamic model is employed to do small signal stability analysis by the eigenvalue analysis. The locus of the eigenvalue, which is corresponding to the oscillation model is studied. Time domain simulations conducted in Matlab/Simulink are used to validate the small signal stability analysis.
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

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.

Vector Control of Wind Turbine Generating System Using PI and Model Predictive Controller
Dibin Chandran,M Lydia
International Journal of Innovative Technology and Exploring Engineering , 2013,
Abstract: Doubly fed induction generators (DFIG) are widely used in wind turbine generating systems (WTGS). The control of the active and reactive power is done with a rotor current controller. The problem in using a PI controller is the tuning of gain and cross-coupling on DFIG parameters in the whole operating range. A model predictive controller (MPC) is used for power control of DFIG. By using MPC peak over shoot and settling time have been reduced when compared with PI controller. This paper includes simulation of WTGS vector control using PI and MBPC and the performance evaluation of these two systems. And a model of PI controller based WTGS vector control has also been simulated using MATLB Simulink. Simulation results are presented to validate the proposed controllers.
A Study of Power Quality in Grid Interconnection with DFIG
Prof. Shilpi,Swati vats,Vikas Vats
International Journal of Innovative Technology and Exploring Engineering , 2013,
Abstract: A growing number of nations have recognized theeconomic, social and environmental benefits of renewable energyand are enacting tax incentives and other policy measuresfavorable to renewable technologies. To analyze the variousaspects of grid interconnection with DFIG using MATLAB. Thispaper is based on the performance of renewable source of energy(wind). This analysis is based on the MATLAB Simulation, Withthe help of this software & using simulation technique analysis ofPerformance is done & Power Quality Problems such as voltagesag, voltage flicker and unbalance voltage due to fault are alsoanalyzed. This paper shows the power electronic gridinterconnection supports the variable speed wind power, real andreactive power control, and reduces the influences of fluctuationsin the wind such as voltage flickers. Nonetheless, it generatesother problems due to the switching devices of the powerconverters. One problem of the grid interconnection is harmonicdistortions of the grid currents and voltages. The harmonicdistortions degrade the power quality. This leads to more severeproblems in the power system such as transformer saturations,failure of protective devices, etc
Impact of Wind Farms of DFIG Type on Power System Transient Stability  [PDF]
Libao Shi, Shiqiang Dai, Liangzhong Yao, Yixin Ni, Masoud Bazargan
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.28063
Abstract: The impact of large-scale grid-connected wind farms of Doubly-fed Induction Generator (DFIG) type on power system transient stability is elaborately discussed in this paper. In accordance with an equivalent generator/converter model, the comprehensive numerical simulations with multiple wind farms of DFIG type involved are carried out to reveal the impact of wind farm on dynamic behavior of existing interconnected power system. Different load models involving nonlinear load model and induction motor model are considered during simulations. Finally, some preliminary conclusions are summarized and discussed.
Vector Control Analysis of Doubly-Fed Induction Generator in Wind Farms
Energy and Power , 2013, DOI: 10.5923/j.ep.20130302.02
Abstract: This paper presents vector control of grid-connected wind turbines; also the second goal of this research is to survey the vector control for wind turbines with doubly-fed induction generators (DFIGs) when a short circuit faults in grid happens. In fact in this paper, vector control of stator-flux is applied for stator- and rotor-side converters in order to control of active and reactive powers simultaneously, and to keep the DC-link voltage constant. Also the method performances are tested in different cases.
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