Realization of MPPT of PMSG-Based Wind Turbines Using New MPPT Indices

The energy extracted from the wind turbines depend not only on the wind speed, but also on the applied scheme of the maximum power point tracking (MPPT). In this paper new indices to assign the enhancement level of the MPPT schemes are proposed. These indices based on the relative convergence between actual and maximum values of power coefficient
$(C_{p_{-}max})$
moreover, actual and optimum values of tip speed ratio
$(\lambda_{opt})$
. The proposed indices are used to determine the efficient MPPT scheme. These indices are applied on grid connected permanent magnet synchronous generator (PMSG) with a full size back-to-back converter. Comprehensive models of wind speed, wind turbine, PMSG and power electronic converters along with their control schemes are implemented in MATLAB/SIMULINK platform. The results prove the robustness and feasibility of theses MPPT indices to determine the most efficient MPPT scheme.