Second-Order Sliding Mode Control of Wind Turbines to Enhance the Fault-Ride Through Capability Under Unbalanced Grid Faults

Khalfallah Tahir, Tayeb Allaoui, Mouloud Denai, Said Mekhilef, Cheikh Belfedal, Mhamed Doumi

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Abstract

The integration of wind generation to the grid is growing rapidly across the world. As a result, grid operators have introduced the so-called grid codes (GC), which nowadays include a range of technical conditions and requirements, which wind generators must fulfill. Among these, the low voltage ride through (LVRT) is a requirement for wind turbines to stay connected to the grid and continue to operate during the disturbance. In this study, a control structure, combining inertial kinetic energy storage with a crowbar circuit, is proposed to enhance the ride-through capability of a wind turbine generator (WTG) based on a wound-field synchronous generator (WFSG) under unsymmetrical voltage dips. For the grid-side converter (GSC), a decoupled double synchronous reference frame (DDSRF) d-q current controller is used. Furthermore, a Second-Order Sliding Mode Controller (SOSMC) with Super-twisting (ST) algorithm is proposed for the GSC and the machine-side converter (MSC) to improve the response speed and achieve an accurate regulation of the dq-axis current components simultaneously. The main objectives of the GSC are to achieve a balanced, sinusoidal current and smooth the real and reactive powers to reduce the influence of the negative sequence voltage. A series of simulations are presented to demonstrate the effectiveness of the proposed control scheme in improving the LVRT capability of the WFSG-driven wind turbine and the power quality of the system under unbalanced grid voltage conditions.
Original languageEnglish
Number of pages28
JournalInternational Journal of Circuit Theory and Applications
Early online date19 Apr 2021
DOIs
Publication statusE-pub ahead of print - 19 Apr 2021

Keywords

  • Wind turbine, wound-field synchronous generator, low voltage ride-through, decoupled double synchronous reference frame, Super-twisting algorithm; Second-Order Sliding Mode Controller

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