Adaptive sliding mode control of DFIG fed by matrix converter during grid faults

The doubly fed induction generator (DFIG) is one of the mostly used options in variable-speed wind power generation. The present paper studies the transient behavior of the DFIG fed by a matrix converter during network voltage dips. The dynamic model used for the transient analysis of the DFIG during network disturbances is presented. Vector control strategy is used to ensure independent control of the active and reactive powers. In order to illustrate the behavior of the DFIG during network disturbances, a symmetrical voltage dip is applied to the DFIG stator terminals. This voltage dip is chosen within the limits set by the grid codes considered in the present paper. Simulation results showing large transient stator and rotor currents are presented and discussed. Finally, the mostly used technique to ensure a low voltage ride-through capability for the DFIG and to minimize the effects of grid disturbances on the generator is reviewed.