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In this paper, an attempt is made to develop a speed sensor DFIG-based grid-connected Wind Turbine (WT) system with Nine switch converter (NSC) instead of Back-to-back converter (B2BC). The NSC the merits of reduced number of switching devices and cost, more efficient and reduced installation area over B2BC. a new control scheme, with the use of rotor speed sensors from generator, is proposed for NSC to track the maximum power point (MPP) by controlling the active power flow between rotor and grid under varying wind velocity at unity power factor (UPF). Furthermore, 120 o discontiunuous modulation scheme is also incorporated with proposed control scheme to minimize switching losses of the system. The complete study system has been simulated in MATLAB/simulink platform and all the simulation selults are analyzed in details to study the performance of the system. Simulation results ilustrate that the NSC based WT system and its proposed control scheme can work at its optimum power level for an extensive range of wind velocity and also competent to achieve independent control on flow of both active and reactive powers.
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