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Energies 2016, 9(2), 69; doi:10.3390/en9020069

An Innovative Control Strategy to Improve the Fault Ride-Through Capability of DFIGs Based on Wind Energy Conversion Systems

1
College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
2
Faculty of Electrical Engineering, Industrial University of Ho Chi Minh City, Ho Chi Minh 700000, Vietnam
3
Duy Tan University, Da Nang 550000, Vietnam
4
Power Engineering Consulting Joint Stock Company 4, Nha Trang 650000, Vietnam
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 8 November 2015 / Revised: 15 January 2016 / Accepted: 19 January 2016 / Published: 25 January 2016
View Full-Text   |   Download PDF [6523 KB, uploaded 25 January 2016]   |  

Abstract

An innovative control strategy is proposed for enhancing the low voltage ride-through (LVRT) capability of a doubly fed induction generator based on wind energy conversion systems (DFIG-WECS). Within the proposed control method, the current control loops of the rotor side converter (RSC) are developed based on passivity theory. The control scheme for the grid side converter (GSC) is designed based on a two-term approach to keep the DC-link voltage close to a given value. The first term based on the maximal voltage of GSC is introduced in the GSC control loops as a reference reactive current. The second one reflecting the instantaneous unbalanced power flow between the RSC and GSC is also introduced in the GSC control loops as a disturbance considering the instantaneous power of the grid filter to compensate the instantaneous rotor power. The effectiveness of the proposed control strategy is verified via time domain simulation of a 2.0 MW-575 V DFIG-WECS using PSCAD/EMTP. Simulation results show that the control of the DFIG with the proposed approach can improve the LVRT capability better than with the conventional one. View Full-Text
Keywords: wind energy conversion systems (WECS); doubly fed induction generator (DFIG); passivity-based control (PBC); low voltage ride-through (LVRT) wind energy conversion systems (WECS); doubly fed induction generator (DFIG); passivity-based control (PBC); low voltage ride-through (LVRT)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Le, V.; Li, X.; Li, Y.; Dong, T.L.T.; Le, C. An Innovative Control Strategy to Improve the Fault Ride-Through Capability of DFIGs Based on Wind Energy Conversion Systems. Energies 2016, 9, 69.

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