Nonlinear synergetic control approach for dc-link voltage regulator of wind turbine DFIG connected to the grid

In this paper, we present the nonlinear synergetic control applied to double-fed induction generator (DFIG) of the wind turbine connected to the grid in a wind energy conversion system. The DFIG used consists of a common induction generator with a collector ring and a partial scale power electronic converter back-to-back, rotor side converter and grid side converter. This configuration has full control of speed, total control over electrical torque, operates in the network disturbances case and also supports compensation of the reactive power. A nonlinear synergetic controller was applied to the grid side converter for dc-link voltage regulation. The Nonlinear synergetic control method was applied and validated by the detailed simulation in MATLAB / Simulink/ SimPower Systems. All components of the system are described in detail. To study the behavior and efficiency of the nonlinear regulator, comparison with the classical synergetic controller is presented.