Improved sliding mode control for wind turbine under wind speed variation [articol]

Abstract

Doubly Fed Induction Generator is very popular in variable speed wind power plants[1, 2] because of it advantages like lessen losses , minimum cost ,an improved efficiency and active and reactive power control capabilities[2]. Traditionally their control is based on PI a controller which is advisable for linear time invariant systems. However, the components in wind turbines work as nonlinear systems where electromechanical parameters change frequently [3]. This paper proposes a first order sliding mode control however such control may excite unmodeled high frequency system transients due to chattering phenomenon. The aim of the proposed controller is to contribute with some important features such as chatter free performance and heftiness in terms of transient response of the nonlinear systems subjected to dynamic conditions such as lower and higher wind speeds, robustness and secure power system operation. The wind turbine is validated in the Matlab/Simulink environment and the simulation results obtained confirm the performance of the proposed control