The electro-mechanical actuator of a wind turbine is configured to be powered from a DC link intermediate circuit. A method for controlling the actuator includes: determining whether a voltage demand and a power demand for operating the electro-mechanical actuator at a specific operating point can be met by an output of a first converter. The first converter is connected to a supply grid and configured to provide a first voltage and a first power to the DC link intermediate circuit; and, when the voltage demand and the power demand cannot be met, triggering a boost mode of a second converter connected between the DC link intermediate circuit and an energy store. The boost mode is triggered to: boost the voltage at the DC link intermediate circuit to a second voltage; and, boost the power supply to the electro-mechanical actuator via the DC link intermediate circuit to a second power.

The present disclosure is related to pitch systems for blades of wind turbines. The pitch system comprises a pitch bearing having a first bearing ring connected to a hub of the wind turbine, and a second bearing ring connected to a blade. The pitch system also includes an annular gear and a pitch drive having a motor, a gearbox, a main brake, and a pinion. In addition, the pitch system includes an auxiliary brake system comprising an auxiliary brake and an auxiliary pinion to engage with the annular gear, where the auxiliary brake is configured to switch between an active state, wherein braking forces are applied to the annular gear to maintain the blade in an instantaneous position, and an inactive state. The present disclosure further relates to wind turbines comprising such pitch systems and methods for applying an emergency pitch braking torque to a pitch system.

The present disclosure is related to pitch systems for blades of wind turbines. The pitch system comprises a pitch bearing having a first bearing ring connected to a hub of the wind turbine, and a second bearing ring connected to a blade. The pitch system also includes an annular gear and a pitch drive having a motor, a gearbox, a main brake, and a pinion. In addition, the pitch system includes an auxiliary brake system comprising an auxiliary brake and an auxiliary pinion to engage with the annular gear, where the auxiliary brake is configured to switch between an active state, wherein braking forces are applied to the annular gear to maintain the blade in an instantaneous position, and an inactive state. The present disclosure further relates to wind turbines comprising such pitch systems and methods for applying an emergency pitch braking torque to a pitch system.

A pitch energy module comprising one or more ultracapacitors storing electrical energy for a wind turbine emergency pitch energy event. The pitch energy module replaces at least one battery within a battery housing of a wind turbine and interfaces with the existing battery wiring harness to communicate with a control system of the wind turbine. The pitch energy module is installed without further modification to the battery housing or the battery wiring harness.

A system for a wind turbine nacelle includes a rotor head, a plurality of blade holders connected to the rotor head, and a shaft having a first end that extends into the rotor head. Linear movement of the shaft causes movement of the plurality of blade holders. The system further includes an electromechanical pitch actuator connected to a second end of the shaft and configured to translate linearly to move the shaft linearly. The system further includes a linear drive system connected to the electromechanical pitch actuator. The system further includes a fail-safe system connected to the electromechanical pitch actuator via the linear drive system. The fail safe system actuates to force the electromechanical pitch actuator rearward to move the blades into a stall blade position.

A pitch energy module comprising one or more ultracapacitors storing electrical energy for a wind turbine emergency pitch energy event. The pitch energy module replaces at least one battery within a battery housing of a wind turbine and interfaces with the existing battery wiring harness to communicate with a control system of the wind turbine. The pitch energy module is installed without further modification to the battery housing or the battery wiring harness.