International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
www.irjet.net
“THEORETICAL APPROACH OF DFIG SYSTEM WITH HARMONICS & DISTORTION” 1MR.HARSHAL
B.TIJARE, 2PROF. A. N. KAUSAL
1ME
Scholar, Department of Electrical Engineering, KGIET, Darapur, India Professor, Department of Electrical Engineering, KGIET, Darapur, India --------------------------------------------------------------------***------------------------------------------------------------------2Assistant
Abstract-Wind power generation based on the doubly-fed induction generator has gained increasing popularity due to several advantages, including smaller converters rating around 30% of the generator rating, variable speed and four quadrants active and reactive power operation capabilities, lower converter cost, and power losses compared with the fixed-speed induction generators or synchronous generators with full-sized converters. This paper presents the theoretical approach of DIFG system with doubly-fed induction generator (DFIG)-based wind-power generation system. Keywords: doubly-fed induction generator, reactive
power, fixed speed induction generators.
1.INTRODUCTION With the increased penetration of wind energy into power grids all over the World, more and more large-scale wind turbines and wind power plants have been installed in rural areas or offshore where the grids are generally quite weak. The operation and control of such remote wind turbines under non-ideal voltage conditions, including severe voltage sags, network unbalance, and harmonic voltage distortions, have attracted more and more attention [1–14]. With many excellent merits such as low rating converter capacity, variable speed constant frequency operation and independent power regulation capability, wind turbines based on doubly-fed induction generators (DFIGs) have become one of the mainstream types of variable speed wind turbine in recent years. Unlike wind generators with the fullsized grid-connected converters (such as permanent magnet synchronous generators), DFIG is very sensitive to aforementioned grid disturbances as its stator is directly connected to the grid and the rating of the back-to-back converter is limited.
2. RELATED WORK Marouane El Azzaoui et. al.[1] proposed the backstepping control of Double-Fed Induction Generator (DFIG) and © 2017, IRJET
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integrated with wind power system. The proposed algorithm combines the nonlinear Backstepping approach and the field orientation applied to control the DFIG. In a first step, this technique is applied to the side converter rotor (RSC), to control the electromagnetic torque and reactive power, and secondly, it is applied to the grid side converter (GSC) to control the power exchanged with the grid and regulate the DC bus voltage. Author presents the simulations results and performances of system in terms of set point tracking, stability, and robustness with respect to sudden changes in wind speed. Jayasankar V N et. al [2] proposed the Hybrid Wind-Solar system and show the simulated results in MATLAB. Author used the DC-DC converter and grid interfacing for grid interconnection of Renewable System. Inverter is controlled in such a way that it act as a grid interfacing unit as well as a shunt active filter. Non linear loads are connected at point of common coupling. Various Renewable Energy generation conditions with unbalanced and distorted grid conditions are simulated and found that system works well for different conditions. Thus grid interfacing inverter with additional functionality of shunt active power filter can be utilized in distribution systems for cost effective distributed generation with power quality improvement features. Rojan Bhattarai et. al. [3] investigating the state feedback control strategy for Doubly Fed Induction Generator (DFIGs). Bu using the state feedback control technique author designs both the rotor side converter and grid side converter control of DFIG. Author also presents the comparison between the traditional PI based vector control (VC) of DFIG with the proposed system. It has been shown that this methodology helps in easier controller design for DFIG, exhibits competitive performance in terms of low interaction between power and voltage control and provides better system damping. The simulation results for a system connected to a grid through a transmission line have been presented and the capabilities of the proposed controller are discussed.
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