There is presented a method for damping an edgewise vibration of a rotor blade of a wind turbine, wherein the method comprises measuring at the rotor blade a motion parameter of the edgewise rotor blade vibration, generating based on said motion parameter a blade pitch angle control signal, and damping the edgewise vibration of the rotor blade by pitching the rotor blade according to the blade pitch angle control signal, wherein the blade pitch angle control signal is arranged so that a resulting force on a rotor blade pitched according to the blade pitch angle control signal, in a direction of the edgewise vibration of the rotor blade in a coordinate system, which rotates with a rotor of the wind turbine, is opposite and proportional to the edgewise rotor blade vibration velocity.

Disclosed herein is a yaw brake system including a multi-disk member disposed in an upper portion of a tower frame of wind generator and including at least two disks, and a braking member disposed in a lower end of a nacelle frame of the wind generator, and provided to brake yawing of a nacelle by interlocking with the multi-disk member. In accordance with the disclosure, it is possible to prepare for buildup of equipment, such as a blade, a hub, or a nacelle, depending on an increase in power of wind power generation, and at the same time to more effectively brake yawing of the nacelle due to a rapid change in wind direction while overcoming a limited space in the nacelle.

Damage to a driving device or a ring gear or both due to an excessive force at a meshing portion therebetween is effectively prevented.

In the embodiment described above, a driving device includes a driving device body that is provided in one structure at a movable section of a wind turbine and has a drive gear meshing with a ring gear provided in the other structure at the movable section, and an abnormality detection unit that monitors a force generated between the ring gear and the drive gear or the state of the driving device body or monitors both of the face and the state. Output from the drive gear of the driving device body to the ring gear is stopped when the abnormality detection unit detected an abnormality.

A method and an apparatus for yaw control of a wind turbine under a typhoon. The method for yaw control may include: determining, before or when the typhoon comes, whether there is a fault in a yaw system of the wind turbine; performing a normal yaw control over the wind turbine according to the wind direction, if determination is negative; and performing a yaw control corresponding to the fault on the wind turbine according to the wind direction, if determination is positive. The yaw control corresponding to the fault is performed before or when the typhoon comes, in case of one of a yaw drive mechanism fault, an electronic brake mechanism fault, or a hydraulic brake mechanism fault. The wind turbine is downwind oriented and yaw load reduction is achieved.

A system for slew ring repair includes a drive mechanism and a tool coupled thereto. The tool may include a fixture structurally configured to secure the tool to a frame on a top end of a wind tower, and a rotatable shaft having a proximal end and a distal end, where the proximal end is coupled to the drive mechanism and the distal end is structurally configured to insert within a housing on the top end of the wind tower that contains a slew ring of a wind turbine disposed on the wind tower. The tool may further include a grinder disposed on the distal end of the rotatable shaft, where the grinder is structurally configured to engage the slew ring while being rotated by the drive mechanism for repair or maintenance of the slew ring.

This invention specifically refers to a vertical axis wind turbine of the Darrieus type. More specifically, this invention refers to a vertical axis wind turbine of the Darrieus type fitted with moving vertical blades, for power generation.

There is presented a method for damping an edgewise vibration of a rotor blade of a wind turbine, wherein the method comprises measuring at the rotor blade a motion parameter of the edgewise rotor blade vibration, generating based on said motion parameter a blade pitch angle control signal, and damping the edgewise vibration of the rotor blade by pitching the rotor blade according to the blade pitch angle control signal, wherein the blade pitch angle control signal is arranged so that a resulting force on a rotor blade pitched according to the blade pitch angle control signal, in a direction of the edgewise vibration of the rotor blade in a coordinate system, which rotates with a rotor of the wind turbine, is opposite and proportional to the edgewise rotor blade vibration velocity.

Disclosed is a floating wind turbine including a floating platform and a turbomachine resting on the platform, the turbomachine including: first and second transverse flow turbines disposed symmetrically with respect to a first plane, each turbine including blades including central parts that are extended at the ends by arms, connected to shaft elements by pivoting connections, each turbine also including upper and lower fairings; anda structure for holding the turbines including a vertical median pylon between the turbines and upstream of a second plane containing the axes of rotation of the blades of the turbines.

A counterweight system for mounting a rotor blade on a balanced rotatable hub of a wind turbine is disclosed. The rotatable hub can have at least one blade root region configured to receive a blade root of the rotor blade, and also have a pitch system configured to rotate the rotor blade around a pitch axis. The counterweight system can have at least one support structure having a proximal end spaced apart from a distal end with the proximal end mountable to at least one blade root region of the rotatable hub. The at least one counterweight mass can be at least partially filled with fluid and coupled to the distal end of the at least one support structure. The at least one support structure can be arranged substantially parallel to the pitch axis such that the pitch system rotates the counterweight mass about the pitch axis.

A water flow power generator includes a nacelle, a vane wheel that is disposed so as to be rotatable relative to the nacelle, and that is rotated by a water flow while including a plurality of blades, a power generator that is disposed inside the nacelle, and that generates electric power by using rotating power transmitted from the vane wheel, and a vane wheel rotation stopping mechanism that is disposed in the nacelle, that includes a rod which can enter the inside of a rotational trajectory of the vane wheel, and that stops the rotation of the vane wheel.