A foundation having a central vertical pedestal, a plurality of radial reinforcing ribs extending radially outward from the pedestal. The pedestal and ribs forming a continuous monolithic structure. An anchoring system under the ribs with anchoring the foundation to the ground by anchoring elements connected to rock anchors, soil anchors, piles or the like. The foundation design reduces the weight and volume of materials used, reduces cost, and improves heat dissipation conditions during construction by having a small ratio of concrete mass to surface area thus eliminating the risk of thermal cracking due to heat of hydration.

A lightning protection system is provided, in particular for a rotor blade, the system including: i) a lightning conductor for conducting electrical energy of a lightning; and ii) a measurement device electrically coupled to the lightning conductor and configured to measure an impedance with respect to the lightning conductor. Further, a rotor blade and a wind turbine are provided.

The present invention relates to the technical field of wind turbine energy storage, and discloses an onshore wind turbine generator set having a compressed energy storage system, including a wind turbine generator set, an air compressor set, an air expander set and a motor generator which are provided in a wind turbine generator compartment, and a combined air storage device provided outside the wind turbine generator compartment; the motor generator has a first input shaft and a first output shaft, the first input shaft is connected to the wind turbine generator set by means of a first clutch, and the first output shaft is connected to the air compressor set; the combined air storage device includes a first air storage device provided in a tower barrel and a second air storage device provided underground, and the inner cavity of the first air storage device is in connection with the inner cavity of the second air storage device. According to the present invention, electromechanical apparatuses of a compressed air energy storage system are integrated in an onshore wind turbine generator compartment, and are directly coupled to a wind turbine generator set, so that the structure is compact, construction costs are low, and the air storage costs of using a combined air storage device are low.

Disclosed is a method comprising: placing a central steel ferrule (2) on a central reinforcement mesh (1); installing around the central ferrule (2) a central assembly (3) and prefabricated pieces (4, 5) comprising a concrete beam (4) and a steel strut (5); assembling (61) sections between the bases (43) of the beams (4), and filling in (62) the central assembly (3); installing formwork (71, 72, 73) around the central assembly (3), the infill (62) and the outer perimeter; and obtaining, by means of simultaneous concreting, a monolithic concrete foundation (10) in which the ends of the struts are embedded, thus forming the ribbed foundation.

A wind turbine tower installation apparatus and methods of erecting a wind turbine tower are disclosed. The wind turbine tower installation apparatus is arranged for installing a tower has a plurality of longitudinally stackable sections. The apparatus has a frame comprising a guide for positioning the apparatus on an installed tower portion, a platform for supporting wind turbine components on the frame, and a mechanism for transversely positioning the supported wind turbine component in alignment with the tower. A lifting mechanism is provided for moving the apparatus longitudinally up and down the installed tower portion. The apparatus further has a yaw control thruster mounted to the frame and configured to provide a counter acting force to rotational wind loads in use.

Methods are for extending a crane tower along a wind turbine, assembling a crane tower, shortening a crane tower, and constructing a wind turbine tower, in addition to various related apparatus. In certain examples, a crane tower is supported upon the wind turbine tower and extended along the wind turbine tower, where the crane tower includes a crane at or near an upper end thereof, and the wind turbine tower is provided with apparatus including a lifter to elevate the crane tower to create space for inserting one or more extension sections at or near a crane tower base and adding them to the crane tower for extending the crane tower longitudinally along the wind turbine tower.

A wind turbine generator is connected to a rectifier which is directly DC coupled to one or more electrolysers. The, or each, electrolyser comprises a plurality of electrolysis cells arranged in one or more stacks, each electrolysis cell comprising a pair of electrodes, and each stack of electrolysis cells comprising at a plurality of electrical connectors. Each electrical connector is in electrical contact with an electrode of an electrolysis cell. The electrical connectors are electrically connectable to the rectifier by a network of selectively operable electrical conductors which are configured so that some or all of the electrolysis cells are operable in dependence on the operative condition of the selectively operable electrical conductors. A method for controlling torque in a wind turbine generator comprising controlling the operation of the selectively operable electrical conductors in dependence on a generator output characteristic.

An off-shore wind turbine system is assembled using a platform or jack-up vessel, and a first base anchored to the seafloor at a blade assembly off-shore location. A buoyant tower is attached to the first base. A crane provided on the platform or jack-up vessel is used to lift blades and blades, which are then coupled to a turbine held in a nacelle provided at the top of the buoyant tower. The buoyant tower, the nacelle, and the blades are detached from the first base. The buoyant tower, the nacelle, and the blades are towed to a wind farm and connected to a second base provided in the wind farm. The buoyant tower, the nacelle, and the blades are further stabilized using mooring lines spanning between the buoyant towers and other bases provided in the wind farm. The first base and/or the second base include anti-rotation features.

A wind turbine is provided including a generator, a base, a nacelle, a tower having a first end mounted to the base and a second end supporting the nacelle, an electrolytic unit electrically powered by the generator to produce hydrogen from an input fluid, in particular water, and a fluid supply assembly for supplying the input fluid from a fluid inlet arranged below a water level to the electrolytic unit arranged above the water level, wherein the hydrogen produced can be taken out of the wind turbine by the hydrogen output.

The present invention relates to control of a wind turbine to reduce structural loading due to vibrations of the blades along the edgewise direction. A rotor control system for actuating pitch of pitch-adjustable rotor blades of a wind turbine is disclosed. Pitch modification signals are determined based on edgewise load signals for each of the rotor blades. The edgewise load signal are coordinated transformed and input into a primary whirling controller unit to provide whirling signal components which can be used for determining the pitch modification signals.