Robust STATCOM control for the stabilisation of fixed-speed wind turbines during low voltages

摘要

This paper presents a robustvoltagecontrol scheme for fixed-speedwind generators using a static synchronous compensator (STATCOM) controller. To enable a linear and robustcontrol framework with structured uncertainty, the overall system is represented by a linear part plus a nonlinear part that covers an operating range of interest required to ensure stability during severe lowvoltages. The proposed methodology is flexible and readily applicable to larger wind farms of different configurations. The performance of the control strategy is demonstrated on a two area test system. Large disturbance simulations demonstrate that the proposed controller enhances voltage stability as well as transient stability of induction generators during lowvoltage ride through (LVRT) transients and thus enhances the LVRT capability.