Dynamic Modeling for Improvement in Power Quality Issues of DFIG Wind Farms Interconnected with Grid
K. Umadevi1, S.V.N.L. Lalitha2, S.H. Chetwani3

1K. Umadevi, M.Tech, Department of Electrical and Electronics Engineering, KLEF, Guntur (A.P), India.
2Dr. S.V.N.L Lalitha, Professor, Department of Electrical and Electronics Engineering, KLEF, Guntur (A.P), India.
3Dr. S.H Chetwani, Assistant Director, Department of Electrical Research & Development Association, Vadodara (Gujarat), India.
Manuscript received on 07 March 2019 | Revised Manuscript received on 20 March 2019 | Manuscript published on 30 March 2019 | PP: 663-668 | Volume-8 Issue-5, March 2019 | Retrieval Number: E3312038519/19©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: This paper depicts improved dynamic modeling of doubly fed induction generator (DFIG) wind farms with a grid-connected system under issues of power quality like voltage sag, swell & harmonics. They have a severe impact due to nonlinear & unbalanced loads fed by DFIG integrated into a grid. Due to this, the synchronous reference frame (SRF) control strategy is proposed for ride through of voltage sag, swell & improve power factor and filters are used to reduce harmonics in DFIG system connected to the grid. The pitch control strategy used to pitch angle control of the turbine blade & maintain rotor speed constant. These control schemes effectively work at varying wind speed in DFIG wind farms and support control active & reactive power. The system is simulated in MATLAB/Simulink using a 2.5MW DFIG wind turbine connected to the grid. The proposed control strategy enhances the performance of the entire system. The results are discussed in detail with and without control strategy.
Keyword: Harmonics, Power Factor, Pitch Control, Voltage Sag, Voltage Swell, DFIG, Grid.
Scope of the Article: Grid Networking/ Computing