Improved Adaptive Nonlinear Control For Variable Speed Wind-Turbine Fed By Direct Matrix Converter
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Date
2023-02-10
Journal Title
Journal ISSN
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Publisher
Rev. Roum. Sci. Techn.– Électrotechn. et Énerg ,Vol. 68, 1, pp. 58–64, Bucarest, 2023
Abstract
This paper proposes a robust decoupling power algorithm based on a doubly fed induction generator (DFIG) for variable speed
wind-turbine (WT). The DFIG rotor circuit is fed by the direct matrix converter (DMC), which presents several features such as no
need to the dc-bus voltage, sinusoidal supply, rotor side waveforms, bidirectional power flow, and adjustable input power factor.
The 18 bidirectional switches are controlled using the Venturini modulation technique. On the other hand, the DFIG stator circuit is
connected directly to the grid. The nonlinear control strategy based on feedback linearization is applied to control the stator power
(Ps and Qs) independently using the rotor quadrature and direct currents (irq and ird), which present the images of the previous
stator powers. Some limitations appear in the power algorithm using the conventional pi controller, especially in power tracking,
error, and quality. In this context, the model reference adaptive controller (MRAC) presents an alternative solution, a robust and
efficient controller proposed instead of the pi controllers to control stator powers. Finally, the simulation results confirm that the
proposed algorithm could work under hard conditions and demonstrate that the wind energy conversion system (WECS) provides
enhanced dynamic responses in transient and steady states and good power quality delivered to the grid.