A system for controlling pitch angle of a blade of a wind turbine is provided. The system may comprise a switched reluctance motor and an inverter. The motor may be configured to be positioned at a hub of the wind turbine and coupled to the blade. The motor may have a stator and a rotor. The stator may have: (i) multiple stator poles and (ii) coil windings around each of the multiple stator poles. The rotor may be rotatably mounted with respect to the stator. The rotor may have multiple rotor poles and a rotor shaft configured to be coupled to the blade to control the pitch angle of the blade. The inverter may be configured to supply electrical power to the coil windings to control motion of the rotor shaft in response to receiving a pitch angle control signal from a pitch angle control system of the wind turbine.

There is provided a control system for controlling power transmission associated with a first wind turbine. The control system is configured to: monitor an alternating current, AC, phase angle associated with the first wind turbine and/or monitor a rate of change of the AC phase angle associated with the first wind turbine; determine whether there is a change in the AC phase angle which is above a first threshold value and/or determine whether the rate of change of the AC phase angle is above a second threshold value; and in response to determining that there is a change in the AC phase angle which is above the first threshold value and/or the rate of change of the AC phase angle is above the second threshold value, cause the first wind turbine to operate its dynamic braking system, DBS, to reduce an instantaneous power output of the first wind turbine.

A controller for controlling a wind power generation device including a tower and a nacelle includes: a processing circuit configured to control a motor for rotating the nacelle relative to the tower; and a torque information sensor for sensing information about a torque acting from the nacelle to a gear mechanism, the gear mechanism connecting the tower and the nacelle so as to be capable of relative rotation. The processing circuit drives the motor based on a sensing value of the torque information sensor.

A method for controlling a power generating asset connected to an electrical grid includes receiving, via a controller, a grid power limit associated with one or more grid events occurring in the electrical grid. During the one or more grid events, the method includes implementing, via the controller, a power softening function. The power softening function includes increasing a power command of a generator above the grid power limit to avoid large changes in power of the generator, thereby reducing a likelihood of coupling slips of the drivetrain and diverting extra power generated during the one or more grid events to an energy buffer of the power converter based on an energy buffer power command, thereby maintaining a net power generated by the power generating asset within the grid power limit.