Commercial wind turbines are usually controlled to capture as much as energy as possible from the wind, limiting the power efficiency at high wind speeds to avoid overloading. This is typically achieved by collectively pitching the blades. Gain scheduled PI controllers are conventionally used to command the pitch actuators. Because of their inherent limitations, they can hardly be tuned and optimized to satisfactorily accomplish more demanding new objectives like active power control and mitigation of the mechanical loading. We seek for higher performance control systems based on advanced control techniques such as Linear Parameter Varying control, Sliding Mode control and passivity based control. New topologies, machines and control structures are also investigated in order to improve operation under grid fault conditions or and to provide ancillary services like grid stability support.