Abstract: Lightning protection system (LPS) with an integrated anti-icing system for wind turbine blades that comprises a smart protection system (10), an integrated IPS characterized by some conductive sheets (13) embedded in the carbon laminate of the wind turbine blade (1), some overvoltage dischargers (11) installed between the conductive sheets (13) of the IPS and the downlead cable (2) for the lightning protection system (LPS) and an external receptor frame (17).

Abstract: A three phase medium voltage power conversion system for closed-loop applications comprising a 3L-NPC converter. The switching system of the 3L-NPC converter is based on SHE-PWM patrons. The regulation system of the 3L-NPC converter comprises a controller and an interface module between the controller and the switching system which is configured for supplying to the switching system voltage reference samples at a rate L times faster than the rate of voltage reference samples managed by the controller.

Abstract: Reinforced wind turbine tower (1) formed by a hollow body (2), which comprises in its interior at least one reinforcement structure (3) formed by a series of longitudinal reinforcements (4), where each of said reinforcements (4) has its two opposite ends attached by attachment means to the hollow body inner surface (2) of the tower at points placed on different vertical lines, and where each reinforcement (4) has at least one of its ends attached by attachment means to the end of the other consecutive reinforcement (4) with the same.

Abstract: Inertia control system for a wind turbine comprising a rotor (5), generator (12) driven by the rotor (5) that interacts with a power converter (13) to generate electricity, a wind turbine controller (15) that comprises a blade pitch controller (19) and a generated power controller (18), a controller for the power converter (14) that interacts with the wind turbine controller (15), characterized because it comprises an inertia emulation block (17) that generates an extra power signal (32) negatively proportional to the frequency change rate (23) that is added to the power reference of the wind turbine generated power controller (15) and adapts the rotational speed reference of the wind turbine controller (15) according to the grid frequency (21) to prevent distortion in the active power output after adding or subtracting power in proportion to the frequency change rate (23).

Abstract: Wind turbine comprising a plurality of converters, which are dynamically switched between at least a first standby state, a second running state, and a third state with an active direct current link. Converters are switched from the first standby state to the third state when a required reactive power is higher than a reactive power capability of converters on the second running state and when a voltage transient occurs.

Abstract: A wind turbine wherein the drive train section corresponding to the main shaft and the first stage of the gearbox is structured by two separable modules and comprises a connecting device between the main shaft and the planet carrier configured to allow a flexible coupling between them. The first module comprises the main shaft, its housing and two bearings as a supporting mechanism of the main shaft in its housing. The second module comprises the first stage of the gearbox, its housing and a double taper rolling bearing on the side adjacent to the first module as a supporting mechanism of the first stage of the gearbox in its housing.

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 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: 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: A wind turbine blade having a Radar Absorbing Material (RAM) and a lightning protection system arranged for guaranteeing the performance of the lightning protection system and the integrity of the RAM. The lightning protection system comprises lightning receptors located at a tip region and one or two down-conductors disposed inside of the wind turbine blade for driving lightning current to ground. The RAM covers the entire wind turbine blade except the tip region and comprises at least a functional layer and a reflector layer connected to the one or two down conductors by way of auxiliary cables.

Abstract: A method of manufacturing wind turbine blades of variable length with connection elements with the rotor hub. The method includes providing and using enlarged manufacturing molds having a common zone of a predetermined length and, at least, an adaptive zone arranged with the length needed for manufacturing the blades with a desired length, particularly the length required for optimizing the annual energy production (AEP) of a predetermined wind turbine model in a predetermined site.

Abstract: Method for protecting the surface of wind turbine blades manufactured with composites so as to furnish them with a finish resistant to normally-encountered external agents, namely rain, ice and grime from atmospheric pollution; and comprising one step for surface preparation as well as two steps for primer application and a second coating having a specified thickness.

Abstract: Exterior cleaning machine in wind turbine-towers, which is coupled to lifting means (7) in a parallel direction in relation to the outer surface of a mast (1) of a wind turbine, and wherein said machine comprises at least one flexible roller (2a, 2b) configured to come in contact with part of the surface of a mast (1) of a wind turbine, a plurality of magnets (3) facing part of the outer surface of the mast (1) and configured to attract the machine with regard to said mast (1) via magnetic phenomena; at least one tank (4a, 4b) configured to receive a cleaning product; a plurality of rolling means (5) between the structure and said mast (1); and remote control means (6) of the lifting motion of said machine associated with lifting means (7).

Abstract: A lightning transmission device between the rotor and the nacelle in a wind turbine, which comprises: a first electricity conductor platen, where one of its ends is separated at a distance with respect to a metal strip located at a root of each blade; a second electricity conductor platen, where one of the ends is separated a distance with respect to a gutter element; an electrical conductor between the first and second platen; an electrical insulator coupled to said first and second platens; which is also coupled to the hub of the wind turbine; and a relative displacement unit between the first and second platen, the unit configured to ensure a predefined distance between the end of the first platen and the metal strip; and between the end of the second platen and the gutter element.

Abstract: The present invention is directed to a method of reducing a mechanical load on the occurrence of voltage dip in the wind turbines. The wind turbine generator controller and the converter control unit work in combination to control the oscillation generated due to voltage dip in the wind turbine 100. The method applies a ramp in power recovery to allow the enhanced DTD damp oscillations before the peak in torque happens. The method involves the step of: delivering a maximum active power value by the converter control unit to the wind turbine generator controller. Next step is setting a saturation value for the set points to enhance the drive train limits. In the next step, ramping is applied to the power set points of the wind turbine generator. And finally an enhanced drive train damping s applied to the ramped value of the power in order to reduce the mechanical load in the wind turbine and to damp the oscillation in the wind turbine generator.

Abstract: A lightning protection system for a wind turbine blade with one or two carbon fiber laminates and one or more down conductors equipotentialized with them by one or more auxiliary cables comprising at least one local lightning current injection area in the carbon fiber laminates associated with one auxiliary cable having secondary cables derived from the auxiliary cable and connected to conductive devices embedded in the carbon fiber laminates which are configured for avoiding overcurrents in the carbon fiber laminates. The invention also provides a lightning protection system for achieving a balanced distribution of currents and voltages between the down conductors and the carbon fiber laminates.

Abstract: A method for alleviating rotor asymmetric loads in a variable-speed wind turbine having pitch and torque control means comprising the following steps: providing a control law that determines the pitch to be applied individually to each wind turbine blade for counteracting rotor asymmetric loads (such as wind shear, upflow, yaw misalignment) using wind speed and wind direction measurements at the wind turbine, values of the wind features that cause rotor asymmetric loads and configuration parameters of the wind turbine (whether real-time values or statistical values at the wind turbine site), said pitch to be added to the collective pitch ?0; implementing said control law in the wind turbine control means. The invention also refers to a wind turbine control system arranged for implementing said method.

Abstract: An apparatus for performing a supporting and/or a lifting operation to a wind turbine component inside the wind turbine nacelle is provided. The apparatus comprises at least a tool which comprises a manually operated linear actuator and a mounting device of said linear actuator in an element of the nacelle frame so that said linear actuator can be duly located with respect to the wind turbine component for performing said supporting and/or lifting operation.

Abstract: The invention provides a lightning receptor arrangement (11, 12) for a wind turbine blade (10) comprising at least a self-threading screw (21) having a head (23) and a threaded shaft (25) as a the external metallic receptor element for receiving a lightning strike in one side of the wind turbine blade (10) and an internal element comprising an electrically conductive block (20) configured with at least an unthreaded hole (41) for cooperating with said threaded shaft (25) and connected to a down conductor (18) of a grounding arrangement. The internal element is joined to at least a shell (17) of the wind turbine blade (10) with an adhesive force capable of withstanding the torque applied to the self-threading screw (21) for threading it to the unthreaded hole (41).

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.