Abstract: A voltage sag generator device (30) for use in an electrical generator machine (2) such as a wind turbine, connected to an electrical network (1) including one to three parallel transformers (3, 4, 5) connected on one side to the wind turbine (2) via a coupling switch (7) and circuit breakers (13, 11, 10), and earthed on the other side via circuit breakers (18, 17, 16) and a control switch (6); means for causing short-circuits when the coupling switch (7) and the control switch (6) are actuated in such a way that a voltage sag having the required duration and type is generated; and means for protecting the transformers (3, 4, 5) during voltage sag generation.

Abstract: The invention relates to a wind turbine (1) which is connected to an electrical power grid (23) and which uses a magnet generator (6) as the only electrical power generator element both in the normal operation thereof and during periods in which the turbine is disconnected from the electrical power grid. The aforementioned wind turbine can perform operations in order to maintain the wind turbine systems operational, with the continued generation of electrical power, and to adjust the quantity of electrical power produced for power consumption during the periods in which the turbine is disconnected from the electrical power grid.

Abstract: The invention relates to a blade for wind-power generators. The inventive blade is divided transversely into two or more independent sections, each section comprising aerodynamic skins or walls (3) and an inner longitudinal reinforcing structure (4). In addition, the ends of the aforementioned sections are equipped with connection means comprising metal inserts (10) which are housed and fixed axially inside the walls of the inner longitudinal resistant structure.

Abstract: The invention relates to a nacelle lifting tool and method for lifting the nacelle (1) of a wind generator in relation to the rotating ring (2). The inventive tool is formed by first and second fixing means which replace brake callipers (4) that are disposed on front and rear lifting means. The aforementioned lifting means are supported by supports (13) which are fixed in the form of braces to the vertices of a regular polygon formed by beams (12). The inventive method consists in removing the brake callipers (4) in order to install the fixing means in an alternating manner and fixing said means vertically. The first and second fixing means include rear (10) and front (11) callipers and the lifting means include hydraulic jacks (16, 17).

Abstract: Oil flushing equipment has four function modes (40) for machinery with rotating parts: the first fills the machinery (40) with oil from a tank (1), the second re-circulates the oil through the machinery (40), the third empties the oil from the machinery (40) to the tank (1) and the fourth cleans the oil in the tank. All four function modes use the motor pump unit (9) and a sequence of two pressure filters (19) in the equipment. The second and third function modes use a vacuum filter (22) situated between the machine (40) and the motor pump unit (9).

Abstract: The present invention relates to a method for operating a converter system of a wind turbine, wherein the converter system includes converter modules capable of converting electric power produced by a generator to electric power applicable to a utility grid. The converter modules include generator inverters and grid inverters. The method determines the enabling/disabling of the converter modules in response to a parameter related to the variable amount of electric power being produced by the generator. Advantages of the present invention are optimisation of power efficiency of the converter modules and improved reliability of the converter modules. Another advantage is the capability of fast enabling and disabling of the converter modules.

Abstract: The invention relates to a method of producing large parts based on composite materials, such as the roots of blades for wind generators. The inventive method comprises the following steps consisting in: helically winding a band of fibre- and resin-based composite material around a mould; applying a removable protective sheet to the surface of the body; applying a heat-shrinkable strip to the sheet; compacting the laminate thus formed under a vacuum; curing the resin; aligning the cured body, machining the transverse surface to be applied to the blade and forming axial housings in said surface; and positioning and affixing inserts in the axial housings in order to secure the blade.

Abstract: The invention relates to a device for generating low-voltage dips in an electrical power generator (2), particularly an aerogenerator, consisting of: a circuit which is disposed between the control cabinet (4) of the generator and the output transformer (3) to the network (30), comprising a transformer (31) and a plurality of in-series impedances (11, 14, 17; 12, 15, 18; 13, 16, 19) for each phase, having switches (24, 25, 26; 20, 21, 22; 27) associated therewith; and short-circuit generator means, selectively actuating the switches as a function of the type of voltage dip required.

Abstract: The invention relates to a method of mounting elements inside a wind generator tower which is made from various different sections (4) of metal. According to the invention, elements such as ladders (3), platforms (9) and electric cables are fixed to auxiliary supports such as beams (2; 1, 1) or rings (10) which are in turn fixed to the above-mentioned sections (4) such as not to reduce the fatigue strength thereof.

Abstract: The invention relates to a tool for preventing the vortex effect, comprising three corrugated tubes which extend helically from the upper end (2) of the tower (3), such as to cover only the upper part thereof. The helix pitch defined by the corrugated tube (1) along the length of the tower (3) is fixed using cords (5) which are attached at each revolution of the tube. The corrugated tube (1) is lifted with a cathead (6) which is disposed on the structure that is used to anchor (4) the tool to the tower (3), said structure comprising three T-shaped sections which form an X having sectors (9) fixed to the ends thereof. In addition, four legs (14) are welded to the aforementioned sectors and the tubes are wound around said legs.

Abstract: In a wind turbine and in a method of operating a wind turbine, the rotor speed and/or the generator power are reduced in response to variables exceeding predetermined values, the variables being one or more of wind direction relative to horizontal direction of main shaft of turbine, turbulence of the wind, or any other variable sensed by one or more sensors mounted on components of turbine.

Abstract: Support which absorbs the torsion to which blades are subjected during transport, comprising a set of pins (17) inserted in the floor (8) of the container (1) and to the sides of a hollow pipe (21), which connect by means of a clevis (18) to different rods (19) secured with fastening pins (20) that facilitate the lengthways and angular rotation of the unit. The first support is located at a distance “d” from the leading edge of the cradle (9), next to the platform (16) formed between the ribs (15) which run through the lower shell (14). The second support is located on the other side of the platform (16) also inserted between the aforementioned ribs (15). Both supports are inclined at an angle ? in relation to the floor (8), each forming articulated quadrilaterals.

Abstract: The present invention relates to a method for operating a converter system of a wind turbine, wherein the converter system includes converter modules capable of converting electric power produced by a generator to electric power applicable to a utility grid. The converter modules include generator inverters and grid inverters. The method determines the enabling/disabling of the converter modules in response to a parameter related to the variable amount of electric power being produced by the generator. Advantages of the present invention are optimisation of power efficiency of the converter modules and improved reliability of the converter modules. Another advantage is the capability of fast enabling and disabling of the converter modules.

Abstract: Structural beam of a wind turbine blade comprising a body-root and a body-trunk in the form of a box with a section decreasing towards the blade tip, comprising various piles each formed by various layers of carbon fibre impregnated with a synthetic resin, located on the upper and lower areas, intercalated between various layers of fibre glass impregnated with synthetic resin arranged along its perimeter, including between two piles, at least one layer of reinforcing material on each of the side areas enveloped by an adhesive resin film. The invention also comprises a procedure for the manufacture of the structural beam which, amongst other stages, includes the application of the layers mentioned onto a mould and the beam curing process.

Abstract: A yawing system for a wind turbine, the wind turbine comprising a tower fixed to the ground and a frame (1) housing an electric power generator, the tower and the frame (1) being joined by the yawing system which allows the orientation of the frame (1) with respect to the tower according to the direction of the wind. The yawing system comprises: a gear ring (2) fixed to the tower, the gear ring having a sliding track (3) on which the frame (1) rests and slides in its yawing movement, at least one geared motor fixed to the frame (1), meshed with the gear ring (2) through a gear wheel, at least one active braking module (5), and at least one passive braking module (6). The invention further comprises a sliding track (3) and a friction track on the gear ring, this friction track (10) being different from the sliding track (3), and the active braking modules (5) and passive braking modules (6) comprising a friction plate (11) acting on the friction track (10) of the ring.

Abstract: Disclosed is a movable independent crane system for moving or replacing components during maintenance operations and for mounting wind generators including auxiliary portal crane (3) providing a portal structure designed to be movable around a pod (1) about a rotation shaft (23). Said mobile independent crane system includes raising devices (100) being part of the crane system and designed to allow self-raising of the crane system because the mobile independent crane system is anchored to the pod through an anchoring unit (4) and because the mobile independent crane system is designed to operate over said pod (1) and outside pod (1) sides.

Abstract: The present invention relates to a method for operating a converter system of a wind turbine, wherein the converter system includes converter modules capable of converting electric power produced by a generator to electric power applicable to a utility grid. The converter modules include generator inverters and grid inverters. The method determines the enabling/disabling of the converter modules in response to a parameter related to the variable amount of electric power being produced by the generator. Advantages of the present invention are optimisation of power efficiency of the converter modules and improved reliability of the converter modules. Another advantage is the capability of fast enabling and disabling of the converter modules.

Abstract: The invention relates to a method and device for injecting current during a mains supply voltage dip. The inventive method consists in permanently monitoring the magnitude and phase of the mains supply voltage and, upon detection of a voltage dip, injecting reactive current in the affected main supply phase(s) in a manner that can vary over the duration of the voltage dip, at very short intervals, proportionally to the magnitude of the dip, thereby absorbing the necessary active current. The device comprises a voltage measurement switch, a transformer (low voltage/medium voltage), a DC/AC inverter, a capacitor, a voltage dip detection circuit, and a control circuit.

Abstract: The invention relates to a lightning arrester system for wind generator blade, which replaces the standard main copper cable and which employs two strips of copper that extend along the entire length of the beam such as to be in direct contact with the carbon fibre. In this way, the carbon fibre laminate and the copper strip are always at the same potential, thereby preventing any possible arc-over between the two elements. The carbon fibre laminate is barely affected by the passage of current owing both to the electrical characteristics of the two components and to the selected configuration which conveys most of the current through the copper strips. In addition, with said novel system it is possible to position intermediate receivers on the actual laminates and in direct contact with the copper strip.

Abstract: A test bench for wind turbines, comprising a test bed (1) on which the assembly (6) to be tested is mounted, and load application means for applying loads on said assembly. The assembly (6) to be tested is mounted on the foundation through a cylindrical support (5), provided with an upper rotary flange, which can be operated by means of a series of geared motors. The load application means comprise a fixed structure (7) anchored to the foundation, a mobile structure (8) which is anchored to the assembly (6) to be tested and a series of actuators (9) relating the mobile structure (8) with the fixed structure (7).