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Control of Wind Turbine Equipped with DFIG after Fault in Power Grid
SayedMohamad Madani,Emadedin Saremian,Kamran Shafafi
Majlesi Journal of Electrical Engineering , 2008, DOI: 10.1234/mjee.v2i3.87
Abstract: grid connected wind turbine is daily increasing .a problem in power grid is grid faults.most problem is system stability after faults, also a probable problem of new energy sources in connection with grid is Islanding due to faults.in this condition loading mismatch between generation and load consumption in isolated part of system can cause voltage and frequency cross it’s allowable limit.too in the case of over generation rotor will accelerate.so these lead to turbine interruption.in this paper wind turbine equipped with doubly fed induction generator is controlled for uninterrupted operation during fault to achieve more stability and rapid voltage recovery. Authority of DFIG grid side converter and Dstatcom effect after three phase short circuit fault are compared. results shows that with combination Dstatcom with grid side converter, voltage regulation in normal operation is beter.also after a fault more voltage stability and rather voltage recovery is achieved.too a suitable control will be presented for sake that wind turbine be able under Islanding operation to feeding local load at rated voltage and rated frequency.ability of control strategy in Islanding operation is investigated and simulation results Illustrate control strategy ability.
Fault Ride through Capability Improvement of Wind Turbine Based DFIG Considering an Optimized Crowbar Along with STATCOM under Grid Fault Condition  [cached]
Alireza Zohoori,Ahad Kazemi,Rouhollah Shafaie
Research Journal of Applied Sciences, Engineering and Technology , 2013,
Abstract: Grid disturbances, especially grid faults, have very unfavorable effect on the performance of wind turbine based Doubly Fed Induction Generator (DFIG). In this study active and reactive powers control of DFIG with STATCOM has been carried out to improve Fault Ride Through (FRT) capability of a wind turbine. In order to excel improvement of the DFIG behavior under grid fault disturbances, an optimized crowbar protection method is also considered together with STATCOM. The optimized protection crowbar resistance is achieved through Analytical Hierarchy Process (AHP) algorithm. Simulations results illustrate that an optimized crowbar protection method along with STATCOM has improved the stability of wind farm and provide grid code requirement compared with that of methods without using the optimized crowbar resistance.
A Novel Method on Fault Ride-Through of a DFIG Wind Turbine using a Dynamic Voltage Restorer During Symmetrical and Asymmetrical Grid Faults
S. Radha Krishna Reddy,Trishulapani. M,C. SOMASANKARAPPA,N. LAVANYA
International Journal of Engineering Innovations and Research , 2012,
Abstract: The application of a dynamic voltage restorer (DVR) connected to a wind-turbine-driven doubly fed induction generator (DFIG) is investigated. The setup allows the wind turbine system an uninterruptible fault ride-through of voltage dips. The DVR can compensate the faulty line voltage, while the DFIG wind turbine can continue its nominal operation as demanded in actual grid codes. Simulation results for a 2 MW wind turbine and measurement results on a 22 kW laboratory setup are presented, especially for asymmetrical grid faults. They show the effectiveness of the DVR in comparison to the low-voltage ride-through of the DFIG using a crowbar that does not allow continuous reactive power production.
Three phase short circuit fault transient analysis of wind farm installed with DFIG wind turbine system

BAO Neng-sheng,ZHU Rui-dan,NI Wei-dou,

控制理论与应用 , 2008,
Abstract: Three phase short circuit fault transient analysis of wind farm installed with DFIG wind turbine system deals with the impact between the wind farm and electrical network. First, based on theoretical analysis, a dynamic model of wind turbine system and power grid were built. Then, applying Matlab/Simulink to parameters of the system, the simulation model of wind farm was programmed. Finally, with the digital simulation and analysis, the transient characteristics of key parameters of the wind farm and wind turbine unit were discussed. The built model and simulation results provided the theoretical basis of research of the impact between the wind farm and the electrical network.
Modelling and Analysis of DFIG Wind Turbine Harmonics Generated in Grids  [PDF]
International Journal of Engineering and Technology , 2010,
Abstract: In this paper an analytic technique for modelling harmonics is proposed for a DFIG wind turbine connected to the grid. An algorithm based on Hilbert transform for the analysis of harmonics in power systems isdeveloped. The simulation results prove the effectiveness of the Hilbert Transform (HT) for power harmonic analysis in DFIG wind turbine connected to a grid.
Performances Study of the DFIG Associated to the Variable Speed Wind Turbine Connected to the Grid
S. Taraft,D. Rekioua,D. Aouzellag
International Journal of Electrical and Power Engineering , 2012,
Abstract: The aim of this research is the study of the performances of the Doubly Fed Induction Generator (DFIG) in a wind turbine of high level powers at variable speed, connected to the electrical grid. The stator of the DFIG is directly connected to the grid, the rotor is connected to the grid fed by a direct frequency converter (called matrix converter). The control of the powers transit (active and reactive) between the aerogenerator and the grid is carried out by the adjustment of the rotor sizes of the DFIG. In a first part, the modeling of the various parts of the aerogenerator is presented. The Maximum Power Point Tracking (MPPT) algorithm to maximize the generated power is used. In a second part, the principle of powers control exchanged between the wind system and the grid is exposed. Finally, the simulation results of the dynamic behavior of the studied system are presented to justify the reliability of the model suggested and the order applied.
Modeling and Control of a DFIG-Based Wind Turbine During a Grid Voltage Drop
A. Babaie Lajimi,S. Asghar Gholamian,M. Shahabi
Engineering, Technology & Applied Science Research , 2011,
Abstract: Doubly-fed induction generators (DFIG) are widely used in wind energy generation systems. During a grid voltage drop, performance is degraded with rotor over current deteriorating the fault-ride through (FRT) capability of the DFIG wind-energy generation system. In this paper, a complete mathematical DFIG model is proposed. The rotor is considered fed by a voltage source converter whereas the stator is connected to the grid directly. Output power and electromagnetic torque are controlled using field-oriented control (FOC). Simulation results show the efficiency of the controller in exploiting the maximum power of wind.
Simulation and Analysis of a DFIG Wind Energy Conversion System with Genetic Fuzzy Controller  [PDF]
B. Babypriya,N. Devarajan
International Journal of Soft Computing & Engineering , 2012,
Abstract: The behavior of a grid connected, wind energy conversion system (WECS) is simulated using MATLAB in this paper. This analysis is presented for different fault conditions like line to ground faults, line to line faults, double line to ground faults and three phase symmetric faults. A genetic algorithm based fuzzy controller is incorporated into the Doubly fed Induction Generator (DFIG) Wind Energy Conversion System. The dynamic behavior of a DFIG Wind Energy Conversion system with genetic fuzzy controller is simulated for different fault conditions and the results are compared to that of the system with PI Controllers. The comparison shows that the incorporation of the Genetic fuzzy controller results in an improvement in the dynamic behavior of the system under transient conditions.
Illustration of Modern Wind Turbine Ancillary Services  [PDF]
Ioannis D. Margaris,Anca D. Hansen,Poul S?rensen,Nikolaos D. Hatziargyriou
Energies , 2010, DOI: 10.3390/en3061290
Abstract: Increasing levels of wind power penetration in modern power systems has set intensively high standards with respect to wind turbine technology during the last years. Security issues have become rather critical and operation of wind farms as conventional power plants is becoming a necessity as wind turbines replace conventional units on the production side. This article includes a review of the basic control issues regarding the capability of the Doubly Fed Induction Generator (DFIG) wind turbine configuration to fulfill the basic technical requirements set by the system operators and contribute to power system security. An overview of ancillary services provided by wind turbine technology nowadays is provided, i.e., fault ride-through capability, reactive power supply and frequency-active power control.
Fault Rid Through Protection of DFIG Based Wind Generation System  [cached]
S. Sajedi,F. Khalifeh,T. Karimi,Z. Khalifeh
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: This study proposes a fault ride-through strategy for a Doubly Fed Induction Generator (DFIG) to enhance network stability during grid disturbances. To enable efficient computation a reduced order DFIG model is developed that restricts the calculation to the fundamental frequency component. However, the model enhancement introduced in the paper allows the consideration of the alternating components of the rotor current as well which is necessary for triggering the crowbar operation. As protection against short circuit transients, the crowbar protection is employed in the simulation. An equivalent model is constructed. Simplifications are made so as to have a system composed of grid, transformer, line and generator represented by elementary circuit elements (R, L, C and voltage sources). Equivalent circuit models are simplified so that the fault models may be used for synchronous machine parameters. It is assumed that the mechanical system cannot respond during the short time of a three phase short circuit. Simulation results in MATLABSimulink software are presented for model verification purposes.
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