Advanced non-linear backstepping control design for variable speed wind turbine power maximization based on tip-speed-ratio approach during partial load operation

Abstract

This study suggests an effective non-linear control scheme to improve wind energy production for getting maximum output power during partial load operation from a variable speed wind turbine generator. The proposed control strategy is based on an integral backstepping control using Tip-Speed-Ratio approach (TSR) for Wind Turbine Generators applications to optimize the wind energy captured by the system operating under rating wind speed. The proposed method has a fast and robust tracking capability. In addition, it is not necessary to know the parameters of the generator so as to get the control signal. This control method is known to scale back the mechanical stress on the generator and turbine shafts. Moreover, the Integral Backstepping Control (IBSC) policy is relatively simple, that considerably reduces the online computational cost and time. The time-domain simulation results prove the efficient operation of the proposed TSR-IBSC with fast system response compared to standard TSR approach.