Robust control of PMSG wind turbine systems with back-to-back PWM converters

This paper proposes a robust control strategy of the PMSG wind power system for the grid voltage sag. The DC-link voltage control is achieved by the generatorside converter instead of the grid-side converter. Considering the nonlinear relationship between the generator speed (ωm) and DC-link voltage (vdc), a DC-link voltage controller is designed using feedback linearization technique. The grid-side converter controls the grid power for MPPT. The validity of this control algorithm has been verified by simulation results for 2MW PMSG wind power system.