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Article

Dynamic Modeling and Robust Controllers Design for Doubly Fed Induction Generator-Based Wind Turbines under Unbalanced Grid Fault Conditions

1
School of Electrical Engineering, Pusan National University, San 30, ChangJeon 2 Dong, Pusandaehak-ro 63 beon-gil 2, Geumjeong-gu, Busan 46241, Korea
2
School of Electrical Engineering and Computer Science, National University of Sciences and Technology, Islamabad 44000, Pakistan
*
Author to whom correspondence should be addressed.
Energies 2019, 12(3), 454; https://doi.org/10.3390/en12030454
Received: 16 December 2018 / Revised: 26 January 2019 / Accepted: 30 January 2019 / Published: 31 January 2019
(This article belongs to the Special Issue Modeling of Wind Turbines and Wind Farms)
High penetration of large capacity wind turbines into power grid has led to serious concern about its influence on the dynamic behaviors of the power system. Unbalanced grid voltage causing DC-voltage fluctuations and DC-link capacitor large harmonic current which results in degrading reliability and lifespan of capacitor used in voltage source converter. Furthermore, due to magnetic saturation in the generator and non-linear loads distorted active and reactive power delivered to the grid, violating grid code. This paper provides a detailed investigation of dynamic behavior and transient characteristics of Doubly Fed Induction Generator (DFIG) during grid faults and voltage sags. It also presents novel grid side controllers, Adaptive Proportional Integral Controller (API) and Proportional Resonant with Resonant Harmonic Compensator (PR+RHC) which eliminate the negative impact of unbalanced grid voltage on the DC-capacitor as well as achieving harmonic filtering by compensating harmonics which improve power quality. Proposed algorithm focuses on mitigation of harmonic currents and voltage fluctuation in DC-capacitor making capacitor more reliable under transient grid conditions as well as distorted active and reactive power delivered to the electric grid. MATLAB/Simulink simulation of 2 MW DFIG model with 1150 V DC-linked voltage has been considered for validating the effectiveness of proposed control algorithms. The proposed controllers performance authenticates robust, ripples free, and fault-tolerant capability. In addition, performance indices and Total Harmonic Distortions (THD) are also calculated to verify the robustness of the designed controller. View Full-Text
Keywords: Wind Turbine (WT); Doubly Fed Induction Generator (DFIG); unbalanced grid voltage; DC-linked voltage control; Proportional Resonant with Resonant Harmonic Compensator (PR+HC) controller; Adaptive Proportional Integral (API) control; power control Wind Turbine (WT); Doubly Fed Induction Generator (DFIG); unbalanced grid voltage; DC-linked voltage control; Proportional Resonant with Resonant Harmonic Compensator (PR+HC) controller; Adaptive Proportional Integral (API) control; power control
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MDPI and ACS Style

Khan, I.; Zeb, K.; Din, W.U.; Islam, S.U.; Ishfaq, M.; Hussain, S.; Kim, H.-J. Dynamic Modeling and Robust Controllers Design for Doubly Fed Induction Generator-Based Wind Turbines under Unbalanced Grid Fault Conditions. Energies 2019, 12, 454. https://doi.org/10.3390/en12030454

AMA Style

Khan I, Zeb K, Din WU, Islam SU, Ishfaq M, Hussain S, Kim H-J. Dynamic Modeling and Robust Controllers Design for Doubly Fed Induction Generator-Based Wind Turbines under Unbalanced Grid Fault Conditions. Energies. 2019; 12(3):454. https://doi.org/10.3390/en12030454

Chicago/Turabian Style

Khan, Imran, Kamran Zeb, Waqar U. Din, Saif U. Islam, Muhammad Ishfaq, Sadam Hussain, and Hee-Je Kim. 2019. "Dynamic Modeling and Robust Controllers Design for Doubly Fed Induction Generator-Based Wind Turbines under Unbalanced Grid Fault Conditions" Energies 12, no. 3: 454. https://doi.org/10.3390/en12030454

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