Method for control of the torque performance of an electric pitch motor (1). A control system (2) comprises a first unit (3) controlling the pitch angle of the rotor blade, a second unit (7) which compares a reference speed Sr with an actual speed Sa of the motor (1) rotational speed. The second unit (7) controls the motor (1) rotational speed, a third unit (10) which regulates the motor (1). The control system (2) comprises a first overload device (13) and a second overload device (14). The second overload device (14) receives an error-speed signal Se, which is the difference between Sr and Sa recorded by the second unit (7). The second overload unit (14) compares See with a maximum allowable speed value, Smax, and the second overload device (14) sends a signal to the motor (1) for the regulation of the torque performance.

The invention describes a method for more efficient way of obtaining mechanical work and/or power generation from fluid flows with the oscillating motion of the blade and the counterweight in a direction that is perpendicular to the flow of fluid in conjunction with a smooth and periodic change of the angle of the blade to the flow of fluid over the sine wave which is characterized by being carried out by: rotating the surface of the blade to the direction of the fluid's flow and/or; changing the amplitude of the oscillation of the blade with respect to the fluid's flow rate and/or; changing the amplitude of the angle of the blade with respect to the fluid's flow rate; capturing mechanical work in the form of torque or tensile/compressive force to propel attached machinery or generate power from the arm of the counterweight. The invention further describes the apparatus to carry out this method.

There is provided a mobile control unit for a wind turbine which has a plurality of components. The mobile control unit has a supply module having a main control unit and at least one control module coupled to the supply module for controlling the components of the wind turbine. The main control unit serves for controlling the components of the wind turbine by means of the control modules connected to the supply module.

A method for estimating a temperature of a motor of a pitch drive mechanism of a rotor blade of a wind turbine includes monitoring, via at least one sensor, an actual temperature and at least one additional operating condition of the motor during a normal operating period of the wind turbine. The method also includes storing, via a pitch controller, the monitored temperatures and the monitored additional operating conditions of the motor for the normal operating period. Further, the method includes determining a relationship between the monitored temperatures and the monitored additional operating conditions of the motor for the normal operating period. Thus, in the event that the sensor fails to operate, the method includes determining, via the pitch controller, an estimated temperature of the motor based on the relationship.

A rotational positioning system in a wind turbine is provided that comprises a driven part, a plurality of positioning drives coupled to the driven part, a plurality of sensors each arranged to sense a load parameter indicative of the load of the respective positioning drive, and a load controller connected to the plurality of sensors. The load controller is arranged to determine a load of a respective positioning drive based on the sensed load parameter, to compare said load with an expected load value, and to output a signal indicative of a failure of the respective positioning drive in response to the load being smaller than the expected load value.

A power converter assembly for an electrical power system connected to a power grid includes a rotor-side converter configured for coupling to a generator rotor of a generator of the electrical power system, a line-side converter electrically coupled to rotor-side converter via a DC link, and a dynamic brake assembly electrically coupled to the DC link. The line-side converter is configured for coupling to the power grid. The dynamic brake assembly includes a plurality of switching devices connected in parallel and a plurality of inductors electrically coupled between the plurality of switching devices.

System and method for controlling operation of a hydroelectric production system comprising electrical actuators operably connected at opposite positions of a gate operating ring for rotating the wicket gates to a desired position. The system receives a single control signal designed for a hydraulic system comprising hydraulic actuators operably connected to a single fluid reservoir and configured to work in tandem to produce simultaneous and opposite axial movements. The system comprises a control interface adapted to produce new control signals, each new signal being intended to a different electrical actuator to cause the electrical actuators to have axial movements which are identical in speed and in opposite directions to substantially imitate the exact movement of the hydraulic actuators onto the gate operating ring. The system is configured to introduce a dampening effect to reduce sudden acceleration and deceleration which is purposely used in hydraulic systems to overcome friction and static effects.

A floating type offshore wind power generation facility includes: a wind power generation unit which is installed to be horizontally rotatable about a vertical rotation center while being placed in an inclined state on an offshore structure or installed to be rotatable in two directions about a horizontal rotation center of the offshore structure, and converts rotational kinetic energy of blades caused by sea wind into electrical energy; and a driving unit which is connected to a lower end of the wind power generation unit in a state in which the driving unit is installed on the offshore structure, and changes a pivoting angle or a rotating angle of the wind power generation unit by generating driving power.

A power converter assembly for an electrical power system connected to a power grid includes a rotor-side converter configured for coupling to a generator rotor of a generator of the electrical power system, a line-side converter electrically coupled to rotor-side converter via a DC link, and a dynamic brake assembly electrically coupled to the DC link. The line-side converter is configured for coupling to the power grid. The dynamic brake assembly includes a plurality of switching devices connected in parallel and a plurality of inductors electrically coupled between the plurality of switching devices.

For each of actuators, the partial load ratio is output. An output device for a drive device of a wind turbine includes an obtaining unit for obtaining information relating to a load applied to each of a plurality of actuators, where the actuators are included in the drive device of the wind turbine and configured to cooperate with each other, a processing unit for, based on the information obtained by the obtaining unit, calculating a partial load ratio, where the partial load ratio represents a ratio of a load on each of the actuators to a total load and the total load is a sum of the loads on the respective actuators, and an output unit for outputting the partial load ratio.