Dynamics of control strategies for wind turbine applications

This paper gives an overview of the state of the art control strategies for large wind turbines using induction generators. An active stall constant speed wind turbine controller with its actuator system for variable pitch angle and a control strategy for a pitch controlled variable speed wind turbine are described. The simulation results of a 2 MW constant speed wind turbine using cage rotor induction generator (CRIG) with both passive stall control and an active stall control strategy are modelled, digitally simulated and compared. To evaluate the performance for an active stall constant speed wind turbine using CRIG versus a pitch controlled variable speed wind turbine using Doubly fed induction generator (DFIG), a set of simulations are performed for wind gusts at an average wind speed higher than the rated value.