Abstract: A lightning current transmission system in a wind turbine between a metal band located at the root of each blade and a metal ring located at the nacelle through a lightning current transmission element comprising a conductive portion, an insulating portion and a supporting unit to be joined to the rotor hub. The metal band and the metal ring are configured with protruding parts extended towards the lightning current transmission element. The conductive portion of the lightning current transmission element comprises first and second receptors mounted on a base plate at different heights and oriented in a direction pointing, respectively, to the protruding parts of the metal band and the metal ring.

Abstract: The invention provides methods and systems for real-time monitoring of the insulation state of wind-powered generator windings comprising the following steps: a) capturing in real-time, during a predetermined time period (in situations where the generator is synchronized to the electrical network but is not yet couplet thereto as well as in situations where the generator is producing energy) the values of one or more electrical and vibration variables of the generator; b) obtaining in real-time, the temporal evolution of the vibration and of the inverse components of electrical variables at one or more predetermined frequencies; c) identifying a possible generator insulation fault when the inverse component of at least one electrical variable and/or one vibration at a predetermined frequency exceeds an absolute threshold or a temporal increase threshold pre-sets.

Abstract: The invention provides a composite laminate comprising an outer, an intermediate and an inner section comprising, respectively, first layers of composite material and one or more functional layers having a printed circuit for absorbing the electromagnetic radiation incident on the composite laminate; second layers of composite material; a conducting layer contiguous to the intermediate section and third layers of composite material. The values of the resistivity of the functional layer and the thickness of the intermediate section are comprised in predefined ranges for the attenuation of the reflection of electromagnetic radiation of the composite laminate in the S or X bands up to a peak of ?20 dB. The invention also refers to manufacturing methods of the composite laminate (11) and to wind turbine blades including the composite laminate.

Abstract: The invention provides a wind turbine having a system for positioning the rotor in an azimuthal reference position Azref and for maintaining it therein for a predetermined period of time, the wind turbine being arranged in test mode. Said rotor positioning system comprises a first controller (31) configured to generate a generator speed reference ?ref from the difference between the rotor azimuthal reference position Azref and the rotor azimuthal measured position Azmeas and a second controller (35) configured to generate a generator torque reference Tref from the difference between said generator speed reference ?ref and the generator speed measured ?meas.

Abstract: Torque absorber for wind turbine gearboxes, comprising a pair of torque arms configured to be coupled on one side to a pair of corresponding protrusions of a gearbox and on the other side to a fixed frame. Each torque absorber comprises at least one pair of ridges that externally embrace the corresponding protrusion; wherein a first absorbing element is located between the ridges and in contact with both the torque absorber and the protrusion of the gearbox; and wherein a second absorbing element is located between the ridges in contact with both the torque absorber and the fixed frame, defining a cushioned union between both components.

Abstract: Control system to prevent wind turbine misalignment situations employing mathematical algorithms implemented in the wind turbine controller. Different optimization algorithms have been analyzed getting results that yaw the nacelle of the wind turbine to positions that would maximize the efficiency function. Control system for detecting and preventing wind turbine misalignment situations that comprises a parameters acquisition unit that relates the wind direction with the deviation of the wind turbine nacelle, a wind turbine efficiency function calculation unit and a deviation comparison unit of the nacelle.

Abstract: A wind turbine blades lifting device including a structure for supporting a blade during lifting. The structure is made of a rigid material and defines a hollow closed contour with a geometry suitable for surrounding the blade, the device further comprising a pneumatic chamber attached to the structure and arranged in the hollow area of the closed contour defined by the structure such that the pneumatic chamber surrounds the blade at least partially. The pneumatic chamber is inflatable and is arranged in the closed contour defined by the structure, such that when it is inflated, the pneumatic chamber retains the blade, immobilizing it and preventing direct contact between the structure and the blade.

Abstract: The invention provides a lightning protection system for a wind turbine blade (10), whose structure comprises two structural shells (11, 13) with two caps (19, 21) formed by carbon fiber laminates and two spars (15, 17). In addition to a first subsystem formed by one or more lightning receptors connected to one or two conductor cables the lightning protection system comprises a second subsystem formed by lateral lightning receptors (30, 31) arranged at the leading and trailing edges of the wind turbine blade (10) in at least two cross sections (22, 23) of it connected with the caps (19, 21) and connecting means between the two subsystems for equipotentializing the lightning protection system.

Abstract: A joining device of a metal segment to a concrete segment of a hollow tower. The joining device is formed by a set of bolts passing by one of its ends by holes of an anchoring ring and attached to its both sides by a first set of nuts and arranged to be attached by its other end to the base of the metal segment by a second set of nuts. The anchoring ring includes a set of connectors extending externally and internally thereto in a substantially perpendicular direction to the bolts and arranged so do not interfere with reinforcement. The invention also refers to a hollow tower comprising at least one metal segment joined to a concrete segment by the joining device.

Abstract: Control method for a wind farm connected to a power grid (1) and comprising a plurality of generating units (2). The presence or absence of a voltage disturbance in the grid (1) is determined with the method, and when the presence of a disturbance is determined, the generating units (2) are controlled during said presence so that they generate the required power and the wind farm (100) thereby participates in stabilizing the grid (1). Furthermore, in the method, when the disappearance of said disturbance is determined, the required power continues to be generated with the generating units (2) for a limited time interval in order to provide a smooth and controlled transient until the voltage of the grid (1) stabilizes. Wind farm connected to a grid (1) and comprising a plurality of generating units (2).

Abstract: The invention provides a three phase medium voltage power conversion system for coupling a power source to a utility grid comprising a power converter and a Notch-Filter. The switching control system of the inverter of the power converter is based on SHE-PWM patrons. The Notch-Filter is tuned to attenuate the frequency of the first harmonic that the switching control system of the inverter cannot attenuate and configured with damping means capable of smoothing the resonance frequency without affecting the notch frequency.

Abstract: Method and device for replacing a blade (13) in wind turbines that comprises two elements, one upper (1) and the other lower (2) that work together to raise and/or lower the blade (13) of a wind turbine. The device's upper element or “top” (1) comprises some elements (4) bolted to the bearing (3) of the wind turbine and some means of fastening (5) the blade (13), while the lower element or “ground” (2) is a structure that encompasses the wind turbine tower (8) and has at least two winches (2.5) and two deviation pulleys (2.4) to connect some cables (6) between the device elements, namely the “top” (1) and “ground” (2).

Abstract: The invention relates to the use of phase change materials (PCMs) to delay icing or to cause de-icing in different wind-driven power generator elements. The invention also relates to the method for delaying icing or causing de-icing in different wind-driven power generator elements based on the use of phase change materials (PCMs), said method comprising: a) obtaining the PCMs, and b) incorporating the PCMs obtained into different wind-driven power generator elements.

Abstract: Ice-resistant paint comprising an ice-resistant base component that in turn comprises a main component entailing a high solid paint with a synthetic polyurethane-based binding component dissolved in a main organic solvent, and a hydrophobe component consisting of hydrophobic ice-resistant functional nanoparticles selected from among nanoparticles functionalized with a polymer and nanoparticles functionalized in sol-gel, where the ice-resistant paint comprises a mixture of the main component with a dispersion of functional nanoparticles dispersed in a dispersing composition constituting the main solvent and a dispersant, and forms a base matrix, where the dispersing composition and functional nanoparticles form a dispersion of nanoparticles in which the functional nanoparticles are in the base matrix, and the dispersion of dispersing nanoparticles mixed with the main component to form an ice-resistant base component of the ice-resistant paint.

Abstract: The invention refers to a system and method for reinforcing a weakened area of a wind turbine blade whose interior comprises a box beam extending from the blade root to the blade tip and wherein said box beam comprises an open end at the blade root. The system is characterized by comprising a repair module (100) adapted for moving inside the box beam and transporting a reinforcement element (107) from the blade root to the weakened area; and by the repair module (100), which is adapted for applying the reinforcement element (107) onto a interior surface of the box beam in the weakened area.

Abstract: Crane of a wind turbine (200), comprising a fixed part (1), a pivoting part (2) which is attached with rotational freedom to the fixed part (1), a support (3) which is attached to the pivoting part (2), a winch (4), a wiring system between the winch (4) and the support (3), and a guide for guiding the wiring system along its path. The wiring system comprises a single wire (6), and the guide comprises a pulley (52) in the fixed part (1) for guiding it through said fixed part (1), and a pulley (53) in the pivoting part (2) for guiding it through said pivoting part (2). The wire (6) comprises a section (60) between the two pulleys (52, 53), which goes through the center of rotation of the pivoting part (2) with respect to the fixed part (1) connecting both parts (1, 2).

Abstract: Wind turbine blades lifting device comprising a structure (1) for supporting the blade (3) during lifting. The structure (1) is made of a rigid material and defines a hollow closed contour with a geometry suitable for surrounding the blade (3), the device (100) further comprising a pneumatic chamber (4) attached to the structure (1) and arranged in the hollow area of the closed contour defined by said structure (1) such that the pneumatic chamber (4) surrounds the blade (3) at least partially. The pneumatic chamber (4) is inflatable and is arranged in the closed contour defined by the structure (1), such that when it is inflated, said pneumatic chamber (4) retains the blade (3), immobilizing it and preventing direct contact between the structure (1) and the blade (3).

Abstract: A lightning current transmission system in a wind turbine between a metal band located at the root of each blade and a metal ring located at the nacelle through a lightning current transmission element comprising a conductive portion, an insulating portion and a supporting unit to be joined to the rotor hub. The metal band and the metal ring are configured with protruding parts extended towards the lightning current transmission element. The conductive portion of the lightning current transmission element comprises first and second receptors mounted on a base plate at different heights and oriented in a direction pointing, respectively, to the protruding parts of the metal band and the metal ring.

Abstract: This invention relates to a synchronous generator for wind turbines comprising a rotor (20) and a stator (10), wherein the stator (10) comprises a plurality of induction coils (11) of a high-temperature superconducting material arranged to generate a magnetic field. The use of the superconducting stator, instead of a superconducting rotor, allows simplifying the refrigeration system, thus eliminating, for example, the rotating joints for cryogenic gas and the rotating joints for high-purity helium gas.

Abstract: The invention provides a lightning protection system for wind turbine blades with optimized injection means of lightning currents in conductive components of their shells. The injection means comprise a current receptor element (27; 47; 67) connected to the input cable of lightning currents and arranged over an area of a shell close to an electrically conductive component (22; 42; 62) and a current injection element (28; 48; 68; 69, 69?) arranged over the electrically conductive component (22; 42; 62) and connected to the current receptor element (27; 47; 67) by at least two distribution cables (31, 32; 51, 52, 53; 71, 72, 73, 74).