Compensation of stator current ripple of DFIG in wind energy conversion system using robust backstepping controller

A robust backstepping controller with nonlinear damping is designed to compensate the stator current ripple of doubly fed induction generator in wind energy conversion systems. The designed controller achieves the exponential ultimate boundedness of the ripple components of stator currents with an arbitrarily fast decay rate and an arbitrarily small bound. A desirable feature that distinguishes the proposed controller from other existing controllers is that the proposed controller is able to perform with a single reference input, and it is constructed only by a static feedback of measured states without additional compensators. As a result, the control input becomes smooth and easy to implement without requiring of differentiation and switching operations. The exponential boundedness and performance of the designed controller are demonstrated by simulation using SimPowerSystems in Matlab and compared with a proportional-integral controllers.