Using adaptive control in DFIG-based wind turbines to improve the subsynchronous oscillations of nearby synchronous generators

In this study, adaptive control is used to damp network subsynchronous oscillations via doubly fed induction generator (DFIG)-based wind turbines. With an increase in wind power penetration in power systems and with regard to the flexible control of wind turbines, the use of wind turbine systems to improve the dynamic stability of power systems has been of significance importance for researchers. One of the important issues in regards to the stability of power systems are the subsynchronous oscillations. Damping subsynchronous oscillations using wind turbines has been studied in various research effort, mainly by adding a supplementary control loop to the control structure of the wind turbine. In most of the studies, this control loop is composed of linear blocks. In this study, adaptive control is used for this purpose. Since adaptive control parameters tend to optimum values in order to obtain optimum control performance, using this controller will help the wind turbines to have positive contribution in network subsynchronous oscillations damping at different wind speeds and system operating points, as shown in this study. It is also shown that this controller has an insignificant effect on the dynamic performance of the wind turbine, itself.