COMPARATIVE STUDY OF TWO CONTROL SCHEMES FOR MPPT STRATEGY OF A WIND SYSTEM
Mots-clés :
Maximum power point, Wind turbine, DFIG, Doubly-fed induction generator, Grid-side converter, Rotor-side converter, Speed and reactive power tracking, Active and reactive power control, Comparative studyRésumé
In this work, the maximum power tracking point (MPPT) of a wind system is achieved by the use of two control schemes, either a decoupled control of speed and reactive power ((Ω-Q) control scheme) or an independent control of active and reactive power ((P-Q) control scheme). Indeed, the principal objective is the comparison of the two kinds of control schemes in terms of efficiency, costs, sizes, reliability, and cumbersome. The control strategies are applied to the RSC of a WECS equipped by a DFIG. In addition, in the case of the (P-Q) control scheme, for the determination of the optimum stator active power reference in the MPPT mode, it is proposed to use the energetic balance sheet on the basis of the rotor dynamic equation of the WECS. Elsewhere, the GSC is controlled to ensure a smooth dc bus voltage. The obtained MPPT results have been presented, discussed, and compared. Practically, the same results have been obtained. However, from a technical-economic point of view, it is shown that the (P-Q) control scheme is more reliable, cheaper, and less cumbersome compared to the (Ω-Q) control scheme.
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