Uma estratégia de controle para o melhoramento do comportamento dinâmico de máquinas de indução duplamente alimentadas operando como geradores eólicos.

Abstract

This work proposes a control strategy for dynamic behavior improvement of the doubly fed induction machine operating as wind generator (DFIG). The proposed strategy intends to accomplish the power and voltage controls of the DFIG, and to actuate in order to avoid the high rotor currents due to grid disturbances occurrence. Thus, the protection performance (crowbar) and hence the converters turning off can be reduced, which means a generator operation reliability improvement. The strategy is based on the states optimal feedback of the DFIG connected to the grid. The optimal control theory makes possible the controllers design from the minimization of a fitness function, whose formulation defines the criterion for the DFIG control system performance. From the obtained results, it can be observed that the proposed strategy is efficient for the rotor current control and makes possible larger DFIG operation reliability.