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: 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: 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: 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: Method and module for measuring the rate of change of frequency of a waveform related to a converter unit of a wind turbine generator, comprising: measuring an instantaneous value of said rate of change of frequency of the waveform, calculating a first filtered value of said rate of change of frequency, said first filtered value having good accuracy but low time response, and calculating a second filtered value of said rate of change of frequency said second filtered value having a good time response but low accuracy, comparing said first and second filtered values and selecting that an output value of said measured rate of change is based on said first or second filtered values depending on said comparison.

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: Method and module for measuring the rate of change of frequency of a waveform related to a converter unit of a wind turbine generator, comprising: measuring an instantaneous value of said rate of change of frequency of the waveform, calculating a first filtered value of said rate of change of frequency, said first filtered value having good accuracy but low time response, and calculating a second filtered value of said rate of change of frequency said second filtered value having a good time response but low accuracy, comparing said first and second filtered values and selecting that an output value of said measured rate of change is based on said first or second filtered values depending on said comparison.

Abstract: A motor provided with a secondary driving system including: a casing; a dented wheel permanently rotating during the normal operation of the motor together with the rotor inside the casing; an endless screw that can be brought into a clutch engagement position in which the screw meshes with the dented wheel and in which the rotation of the screw drives the dented wheel in a non-reversible manner and that can be removed from said position in order to allow the normal operation of the motor; a driving member for manually rotating the endless screw, the driving member rotating about the same rotation axis as the endless screw and rotating the latter by direct engagement.

Abstract: A user interface receives a request from an external entity to display a particular subset of internal data of an organization relating to a particular member thereof, determines from a located file corresponding to the external entity that a member ID of the particular member is listed therein, and thereafter retrieves the internal data of the member from a database. The user interface then culls the particular subset of the internal data to be displayed from the retrieved internal data, applies located rules corresponding to the external entity to the display of such particular subset of the internal data to result in any modifications necessary in view of such located rules, and displays such particular subset of the internal data as modified to the external entity.

Abstract: A motor provided with a secondary driving system including: a casing; a dented wheel permanently rotating during the normal operation of the motor together with the rotor inside the casing; an endless screw that can be brought into a clutch engagement position in which the screw meshes with the dented wheel and in which the rotation of the screw drives the dented wheel in a non-reversible manner and that can be removed from said position in order to allow the normal operation of the motor; a driving member for manually rotating the endless screw, the driving member rotating about the same rotation axis as the endless screw and rotating the latter by direct engagement

Abstract: An arrangement of camouflage for support towers of telecommunications antennas or similar structures, including troncoconical, cylindrical, polygonal or similar shaped bodies, attached to the ground through an anchor plate and equipped with an opening in the lower part for the inlet or outlet of cables communicating with an underground conduit. If weatherproof equipment is used, it would be done through an aerial conduit, the bodies being coated with a plastic coating that has on the outside the form of tree bark, secured by adhesive. The support is capable of being formed by parts encased among themselves or welded together, extensions being attached on the upper part on which main artificial branches are attached, and over them, secondary artificial branches and further a body section that is provided with main artificial branches, and over them secondary artificial branches. Antennas attached over suitable supports will be installed on the top section.

Abstract: A modular booth including aluminum profiles making up a lower and upper zone, respectively, joined to each other through anchor parts with a corner arrangement made up of an outside part and an internal part interconnecting lower profiles to support internal profiles that make up the ground support. On the upper part support parts are located panels filled with insulation material.

Abstract: A corrosion detecting probe is to be used in combination with an electrochemical corrosion-rate meter for performing on-site diagnosis of the corrosion rate of metallic reinforcement systems in concrete structures. After the probe is brought into surface contact with a concrete member, voltage/current signals are applied thereto and a series of calculations are performed to determine the polarization resistance directly about a confined concrete portion. The probe consists essentially of an external counterelectrode, a central counterelectrode, a central reference electrode and a pair of extra reference electrodes (sensors). A current applied from the external counterelectrode serves to repel the lines of current (resulting from a voltage signal first applied at the central counterelectrode) below the probe and within the confined concrete portion which is between the central counterelectrode and the external one.