Harmonics Reduction using a Modified Controller for Doubly Fed Induction Generator
Ahmed Hassan Adel1, Salama Abo-Zaid2, Mahmoud Elwany3

1Ahmed Hassan Adel*, Electrical Engineering Department, Al-Azhar University, Cairo, Egypt.
2Salama Abo-Zaid, Electrical Engineering Department, Al-Azhar University, Cairo, Egypt.
3Mahmoud Elwany, Electrical Engineering Department, Al-Azhar University, Cairo, Egypt. 

Manuscript received on December 22, 2020. | Revised Manuscript received on December 30, 2020. | Manuscript published on January 30, 2021. | PP: 45-50 | Volume-9 Issue-5, January 2021. | Retrieval Number: 100.1/ijrte.E5135019521 | DOI: 10.35940/ijrte.E5135.019521
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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 discusses a control system for the converter of doubly fed induction generator (DFIG) driven by wind energy. The converter of DFIG consists of two main parts; rotor side converter (RSC) and grid side converter (GSC). Two advanced control methods for GSC are presented here in this paper; vector control strategy based on pulse width modulation (PWM) and direct power control (DPC). DPC is based on switching table for voltage vector selection. In addition to grid voltage position, direct and quadrature current components are used here as inputs to the switching table instead of active and reactive powers respectively. This paper proposes a modified switching table for DPC to reduce ripples and total harmonic distortion (THD) of current produced by GSC. A Simulink model for 9 MW wind system based on DFIG is given in this paper. Simulation results are given for PWM, DPC and Proposed system for GSC. In view of THD calculations and simulation results a comparative study and conclusion are given in the end of this paper. 
Keywords: DFIG, DPC, GSC, THD.