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An LVRT Scheme for Grid Connected DFIG Based WECS Using State Feedback Linearization Control Technique

1
Department of Electrical Engineering, Quaid-e-Awam UEST Campus, Larkana Sindh 77150, Pakistan
2
School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
3
Department of Electrical Engineering, Mehran University Engineering and Technology, Sindh 76090, Pakistan
4
School of Electrical & Electronics Engineering, Universiti Sains Malaysia, Penang 14300 Malaysia
5
Department of Electrical Power Engineering, FKEE, Universiti Tun Hussein Onn Malaysia, Johor 86400, Malaysia
6
Department of Electrical and Computer Engineering, COMSATS University Islamabad, Sahiwal Campus 58801, Pakistan
*
Authors to whom correspondence should be addressed.
Electronics 2019, 8(7), 777; https://doi.org/10.3390/electronics8070777 (registering DOI)
Received: 3 June 2019 / Revised: 25 June 2019 / Accepted: 5 July 2019 / Published: 11 July 2019
(This article belongs to the Section Power Electronics)
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PDF [2453 KB, uploaded 17 July 2019]
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Abstract

This paper primarily focuses on an advance control strategy to enhance the low voltage ride through (LVRT) capability in doubly fed induction generator (DFIG) based wind energy conversion system (WCES). In the proposed control strategy, the captured wind energy during grid faults circumstances is stored timidly in the rotor’s inertia kinetic energy. Though a minimal amount of energy is available in the grid, stator current and DC-link voltage are set beneath the perilous levels. However, both the required stator voltage and stator current are kept within a tolerable range of rotor side converter (RSC), through state feedback linearization technique for maintaining the accurate control to suppress the overvoltage and overcurrent. Furthermore, stator current oscillations are significantly suppressed during fault transient. The input mechanical energy from the wind turbine can be resumed after the fault clearance. In spite of being dissipated in the resistors of crowbar circuit, as in the conventional LVRT assemblies, torque balancing among electrical and mechanical measures is attained; DC-link voltage instabilities and rotor speed inconsistencies are substantially reduced. As a result, a noticeable reduction in the requirement of reactive power and swift restoration of terminal voltage on fault clearance is acquired successfully. Correspondingly, several tests are conducted to validate the effectiveness and enhancement in the performance of the DFIG based wind farms, when the proposed control strategy is implemented over it during numerous fault ride-through circumstances. View Full-Text
Keywords: DFIG; LVRT; wind energy system; feedback linearization controller; PI controller DFIG; LVRT; wind energy system; feedback linearization controller; PI controller
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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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Kaloi, G.S.; Baloch, M.H.; Kumar, M.; Soomro, D.M.; Chauhdary, S.T.; Memon, A.A.; Ishak, D. An LVRT Scheme for Grid Connected DFIG Based WECS Using State Feedback Linearization Control Technique. Electronics 2019, 8, 777.

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