Passivity analysis and adaptive control for variable-speed constant-frequency doubly-fed wind power generator

A passivity-based control for variable-speed constant-frequency doubly-fed wind power generator is presented. The control system using energy concept considers the doubly-fed induction generator as a non-linear system, combining the control demands of variable-speed constant-frequency wind power generation, the proper reference (steady-state) behaviors and injecting damp method are chosen. The designed controller achieves maximum wind energy capture by keeping unity power factor in the stator side and asymptotic tracking desired rotor speed. Lastly, an adaptive passivity-based control strategy is considered with regard to the doubly-fed induction generator resistances change. Simulation results based on MATLAB/SIMULINK reveal good performance of the proposed control scheme.