DTC Control Strategy for Doubly Fed Induction Machine
G. Naveen1, P.K.S. Sarvesh2, B. Rama Krishna3
1G. Naveen, is pursuing M.Tech (PE&D) in Lakireddy Balireddy College of Engineering, (A.P), India.
2Mr. P.K.S. Sarvesh, Assistant Professor in Lakireddy Balireddy College of Engineering, (A.P), India.
3B.Rama Krishna, is pursuing M.Tech (PE&D) in Lakireddy Balireddy College of Engineering, (A.P), India.
Manuscript received on September 26, 2013. | Revised Manuscript received on October 15, 2013. | Manuscript published on October 30, 2013. | PP: 92-95 | Volume-3, Issue-1, October 2013. | Retrieval Number: A2155103113/2013©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 focuses the analysis on the control of doubly fed induction generator (DFIG) based high-power wind turbines when they operate under presence of voltage dips. The main objective of the control strategy proposed for doubly fed induction generator based wind turbines is to eliminate the necessity of the crowbar protection when low-depth voltage dips occurs. Conventional Direct Torque Control (CDTC) suffers from some drawbacks such as high torque ripple and variable switching frequency, difficulties in torque as well as flux control at very low speed. This paper is aimed to analyze DTC principles. A direct torque control strategy that provides fast dynamic response accompanies the overall control of the wind turbine. The proposed control does not totally eliminate the necessity of the typical crowbar protection for turbines it eliminates the activation of this protection during low depth voltage dips. The modeling of the complete system is done in MATLABSIMULINK. Simulation results show the proposed control strategy that mitigates the necessity of the crowbar protection during low depth voltage dips.
Keywords: Doubly fed induction machine (DFIM), Direct torque control (DTC), Crowbar protection etc.