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Doubly Fed Induction Generator Based Wind Turbine Associated to a Shunt Active Power Filter for Current Harmonics Mitigation
Samira Dib,,Brahim Ferdi,,Chellali Benachaiba
International Journal of Engineering Science and Technology , 2011,
Abstract: Integration of wind turbine based on doubly fed induction generator (DFIG) into the electrical grid has become an important part of electrical generation in many countries and its importance is continuing to increase. The advantages of using a DFIG instead of other generators are already well known. A few of them are variousspeed generations, the decoupled control of active and reactive power and high power capacity. However, the ever-growing proliferation of power electronics based devices for source conditioning and motion control in modern industrial applications has increased the occurrence of harmonic currents in distribution systems. This harmonics have harmful and costly effects on DFIG such as, the increase of stator and rotor core losses and the increase of the operating temperature. In this paper, a shunt active power filter (SAPF) is proposed to mitigate current harmonics generated by nonlinear loads and keeps the current at the point of common coupling (PCC) sinusoidal. The simulation results using MATLAB/SIMULINK show a good performance of the SAPF for current harmonics mitigation.
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.
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.
Comparing the Quality of Power Generated from DFIG with Different Types of Rotor Converters  [PDF]
Maged N. Nashed, Mona N. Eskander
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.41004
Abstract: In this paper the quality of power generated from wind energy conversion system employing a double fed induction generator (DFIG) is investigated. The DFIG performance is tested with 3 types of converters interfacing the rotor with the grid. These are: the six-step thyristor inverter with diode rectifier, six-step IGBT inverter with diode rectifier, and 3-level IGBT-PWM inverter with diode rectifier. The harmonics in current and voltage, power factor value, and the transient behavior in each system are investigated and compared. Comparison is done at sub-and super-synchronous DFIG operational speed. In the system with lowest power quality passive filters or LC filter are added and improvement in system performance is recorded. From this study the optimum system from point of view of cost and control complexity is concluded.
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.
Coordinated Control of a DFIG-Based Wind-Power Generation System with SGSC under Distorted Grid Voltage Conditions  [PDF]
Jun Yao,Qing Li,Zhe Chen,Aolin Liu
Energies , 2013, DOI: 10.3390/en6052541
Abstract: This paper presents a coordinated control method for a doubly-fed induction generator (DFIG)-based wind-power generation system with a series grid-side converter (SGSC) under distorted grid voltage conditions. The detailed mathematical models of the DFIG system with SGSC are developed in the multiple synchronous rotating reference frames. In order to counteract the adverse effects of the voltage harmonics upon the DFIG, the SGSC generates series compensation control voltages to keep the stator voltage sinusoidal and symmetrical, which allows the use of the conventional vector control strategy for the rotor-side converter (RSC), regardless of grid voltage harmonics. Meanwhile, two control targets for the parallel grid-side converter (PGSC) are identified, including eliminating the oscillations in total active and reactive power entering the grid or suppressing the fifth- and seventh-order harmonic currents injected to the grid. Furthermore, the respective PI-R controller in the positive synchronous reference frame for the SGSC voltage control and PGSC current control have been developed to achieve precise and rapid regulation of the corresponding components. Finally, the proposed coordinated control strategy has been fully validated by the simulation results of a 2 MW DFIG-based wind turbine with SGSC under distorted grid voltage conditions.
Investigation and Simulation of Phase to Ground Fault in DFIG based Wind Turbine System
B. BabyPriya,A. Chilambuchelvan
Bonfring International Journal of Power Systems and Integrated Circuits , 2011,
Abstract: With advent of wind farms in large scale and capacity continuously increasing, issues related to performance of the overall system needs to be addressed. Faults produced by wind turbine generator systems will impact not only the wind farms but also the interconnected system. In this paper the modeling of a 6MW wind farm using doubly fed induction generator is described and the effects of phase to ground faults under various load conditions are studied. For the study use phasor control of the Doubly Fed Induction Generator is used.
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.
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.
Analysis of Short-circuit Characteristics and Calculation ofSteady-state Short-circuit Current for DFIG Wind Turbine  [PDF]
XiaofuXIONG,JinxinOUYANG
电力系统自动化 , 2012,
Abstract: Large-scaledoubly-fedinductiongenerator(DFIG)windturbinesareconnectedtothegridandrequiredtoremaingrid-connectionduringfaults,theshort-circuitcurrentcontributedbythegenerationhasbecomeasignificantissue.However,thetraditionalcalculationmethodsaimingatsynchronousgeneratorscannotbedirectlyappliedtotheDFIGwindturbines.Anewmethodisneededtocalculatetheshort-circuitcurrentrequiredbytheplanning,protectionandcontrolofthepowergrid.Theshort-circuittransitionofDFIGundersymmetricalandasymmetricshort-circuitconditionsaremathematicallydeduced,andtheshort-circuitcharacteristicsofDFIGareanalyzed.Anewmethodisproposedtocalculatethesteady-stateshort-circuitcurrentofDFIGbasedonthederivedexpressions.Thetime-domainsimulationsareconductedtoverifytheaccuracyoftheproposedmethod.
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