A wind turbine is provided. The wind turbine includes a generator, an output thereof being connectable to a power grid via a power transmission path, the power transmission path comprising a generator side converter coupled to the output of the generator, a grid side converter coupled to the power grid, and a DC link coupled between the generator side converter and the grid side converter. For diverting the generator power, a load dump arrangement is provided which includes at least one resistor, a plurality of switches, and a plurality of electrical connections which electrically connect the at least one resistor to the output of the generator and across the DC link via the plurality of switches. One common and configurable load dump is used for both converter system failures and grid failures. As compared to two separate load dumps for converter failures and grid failures, the single load dump will require a smaller space for a wind turbine. Thus, the weight and size of the power converter system may be reduced.

According to an embodiment, a method of operating a wind turbine comprising a DC-to-AC voltage converter is provided, the wind turbine being connectable to a grid via the DC-to-AC voltage converter, the method comprising: determining a line voltage of a power line connecting the DC-to-AC voltage converter to the grid; if the determined line voltage exceeds a predefined voltage threshold value, injecting reactive current into the power line, wherein the amount of reactive current injected is chosen such that an output voltage of the DC-to-AC voltage converter is kept within a predetermined voltage range.

A method of operating a converter of a wind turbine for providing electric energy to a utility grid includes determining a grid voltage. If the grid voltage is between a nominal voltage and a first voltage threshold, i.e. higher than the nominal voltage, a normal procedure for lowering the grid voltage is performed. If the grid voltage is above the first voltage threshold, another procedure for keeping the wind turbine connected is performed, wherein the other procedure is different from the normal procedure. Further a corresponding arrangement is described.

Wind turbine systems and methods are provided. An exemplary system includes a wind driven doubly fed induction generator having a rotor and a stator, the stator providing AC power to a stator bus. The system further includes a power converter coupled to the rotor of the doubly fed induction generator, the power converter providing an output to a line bus, and a transformer coupled to the stator bus. The system further includes a solid-state switch coupled between the stator bus and the transformer.

Systems and methods for reducing current imbalance between parallel bridge circuits used in a power converter of a doubly fed induction generator (DFIG) system are provided. A control system can monitor the bridge current of each of the bridge circuits coupled in parallel and generate a feedback signal indicative of the difference in bridge current between the parallel bridge circuits. Command signals for controlling the bridge circuits can then be developed based on the feedback signal to reduce current imbalance between the bridge circuits. For instance, the pulse width modulation of switching devices (e.g. IGBTs) used in the bridge circuits can be modified to reduce current imbalance between the parallel bridge circuits.

A method is employed for operating a wind turbine. Electrical energy is produced by means of a generator and is fed into an electrical power network. The electrical energy is fed to the secondary side of a transformer at a low voltage and is output on the primary side of the transformer at a higher voltage. The potential on the primary side of the transformer is undefined. In the method, a measured value of the voltage between the primary side of the transformer and the earth potential is first recorded. The measured value is compared with a predefined limit value. The electrical energy produced by the generator is changed if the measured value exceeds the limit value. A wind turbine is designed to carry out the method. Faults in the medium voltage network can be reacted to without an additional star point on the primary side of the transformer being required.

A system includes a gas turbine engine that includes a compressor section configured to generate compressed air and a combustor coupled to the compressor section. The combustor is configured to combust a first mixture comprising the compressed air and a first fuel to generate a first combustion gas. The gas turbine engine also includes a turbine section coupled to the combustor. The turbine section is configured to expand the first combustion gas to generate an exhaust gas. The gas turbine engine also includes a boiler coupled to the turbine section. The boiler is configured to combust a second mixture comprising a portion of the first combustion gas and a second fuel to generate a second combustion gas that is routed to the turbine section. In addition, the boiler generates a first steam from heat exchange with the second combustion gas.

An arrangement having a piston configured to move along an axial pathway a rotating seal configured to seal an inside environment from an outside environment, the rotating seal configured to be acted upon by a pressure exerted from the piston, a differential pressure sensor measuring a pressure difference between a first fluid from the outside environment and a second fluid on the inside environment, a motor connected to the piston, the motor configured to actuate the piston to a position along an axial pathway and an electronic feedback control system connected to the motor, the electronic feedback system configured to interface with the differential pressure sensor and maintain a pressure generated by the piston onto the rotating seal to a desired pressure.

A method and an apparatus for handling and/or servicing components of a wind turbine, such as installing and/or dismantling components into or from a wind turbine nacelle or such as servicing exterior components such as blades, hub, tower and nacelle of the wind turbine are disclosed. The gripping apparatus comprising at least one arm for gripping around the wind turbine tower, the at least one arm capable of forming a gap between gripping elements of the gripping apparatus. The at least one arm extends around the entire outer circumference, seen perpendicular to a horizontal plane, of the wind turbine tower.

A method for mounting a wind turbine blade to a wind turbine hub by use of a crane boom is provided. An orientation of the blade is kept substantially horizontal when the blade is lifted off the ground and mounted to the rotor hub. Control wires, which connect the blade via the crane boom to a winch arrangement, are used for keeping the blade orientation substantially horizontal in addition to at least one bearing wire for bearing the blade weight.

The invention relates to a device for mounting and/or dismantling a component (10), in particular a rotor blade of a wind turbine (20) comprising a tower head (21). Said device comprises at least one guide element (30) that stretches between the tower head (21) and the ground (40) and has at least one supporting device (60) that is essentially fixed in the air, supporting at least a partial load of the weight of the component (10) during the transport of the latter (10) between the ground (40) and the wind turbine (20). At least one guy (70) leads from the supporting device (60) to the component (10), whereby the length of said guy between the supporting device (60) and the component (10) can be modified.

A core assembly for a turbine engine blade includes a generally radially extending trunk interconnected to multiple generally axially extending tabs. The tabs are interconnected by a generally radially extending ligament. Multiple generally axially extending protrusions are interconnected to the ligament opposite the trunk. A mold is configured to define an exterior surface of an airfoil. The core is arranged within the mold and is configured such that the tabs and the ligament break through at the exterior surface.

A gas turbine engine including a combustor with a combustion liner having inner and outer walls is disclosed herein. The gas turbine engine further includes a swirler system adapted to receive a fuel injector and a flow splitter operable to bifurcate an airflow exiting the swirler system into a first bifurcated flow and a second bifurcated flow. A shroud is positioned downstream of the flow splitter and is configured to deflect the first bifurcated flow in a first direction radially inward and the second bifurcated flow in a second direction radially outward. The second bifurcated flow cools both of the inner and outer walls of the combustor liner.

A seal assembly for a nozzle in a gas turbine engine includes a connector having a first hinge portion for attaching to the nozzle, a flat portion for sealing against a wall of the engine; and a first hinge for attaching the connector to the flat portion wherein the connector is adapted to rotate relative to the nozzle and the flat portion is adapted to rotate relative to the connector.

A seal assembly includes a first component and a second component of a gas turbine engine. The first component has a threaded portion. The second component interfaces with the threaded portion and together the threaded portion and the second component form a seal that restricts fluid flow between a first cavity and a second cavity of the gas turbine engine.

A gas turbine engine has a fan section including a fan. A turbine section has a first turbine and a second turbine. A gear reduction between the fan and the first turbine includes an epicycle gear train. The gear reduction is configured to receive an input from the first turbine and to turn the fan at a lower speed than the first turbine in operation. The first turbine further includes a number of turbine blades in each of a plurality of rows of the first turbine. The first turbine blades operate at least some of the time at a rotational speed. The number of blades and the rotational speed is such that the following formula holds true for at least one of the blade rows of the first turbine: (number of blades×speed)/60≧5500. A turbine section is also disclosed.

An air intake system for a gas turbine includes one or more coils in airflow communication with an inlet arrangement. Each coil is constructed and arranged to have a respective upstream face velocity that is intended to be within 20% of the other coils. Each coil utilizes a working fluid of a predetermined temperature range conveyed there through and a plurality of spaced fins. The fins are spaced apart to permit air to flow between adjacent fins as air flows through the coil. At least one of the coils has a number of fins per inch that is different from the number of fins per inch of the other coils. Alternatively, each individual coil has at least one section with fewer or greater numbers of fins per inch that the other sections of that coil.

A gas turbine engine includes a first and second pump driven by a spool. An Air-Oil Cooler downstream of the first pump. An air-air precooler is downstream of the second pump, the air-air precooler downstream of the Air-Oil Cooler.

A gas turbine engine according to an exemplary aspect of the present disclosure includes a windmill pump driven by a spool. A first pump driven by said spool with an air-oil cooler is located downstream of the first pump. A second pump is also driven the spool with an air-air precooler located downstream of the second pump. A method of operating a gas turbine engine during a “windmilling” condition includes driving a windmill pump with a spool during a “windmilling ” condition. A lubricant is communicated to a geared architecture with the windmill pump. A first pump is driven by the spool and an air-oil cooler is located downstream of the first pump.

A turbine engine includes a shaft, a fan, at least one bearing mounted on the shaft and rotationally supporting the fan, a fan drive gear system coupled to drive the fan, a bearing compartment around the at least one bearing and a source of pressurized air in communication with a region outside of the bearing compartment.

A system and method for lubricating gears in a wind turbine blade pitch drive are provided, wherein the pitch drive comprises a drive pinion gear with gear teeth that engage a pitch bearing gear coupled to a respective wind turbine blade. A grease distributor is configured to mount onto and rotate with the pinion gear, and is configured to deliver grease from an external grease supply to at least one valley defined between adjacent teeth of the pinion gear in a contact area of the pinion gear with the bearing gear without the distributor contacting inter-engaging teeth of the bearing gear.

A gas turbine engine includes a heat exchanger, a bearing compartment, and a nozzle assembly in fluid communication with the bearing compartment. The heat exchanger exchanges heat with a bleed airflow to provide a conditioned airflow. The bearing compartment is in fluid communication with the heat exchanger. A first passageway communicates the conditioned airflow from the heat exchanger to the bearing compartment. A second passageway communicates the conditioned airflow from the bearing compartment to the nozzle assembly.

A gas turbine engine includes a geared architecture with a multiple of intermediate gears, and a baffle with an oil scavenge scoop adjacent to each of the multiple of intermediate gears. A geared architecture and method are also disclosed.

A low alloy steel ingot contains from 0.15 to 0.30% of C, from 0.03 to 0.2% of Si, from 0.5 to 2.0% of Mn, from 0.1 to 1.3% of Ni, from 1.5 to 3.5% of Cr, from 0.1 to 1.0% of Mo, and more than 0.15 to 0.35% of V, and optionally Ni, with a balance being Fe and unavoidable impurities. Performing quality heat treatment including a quenching step and a tempering step to the low alloy steel ingot to obtain a material, which has a grain size number of from 3 to 7 and is free from pro-eutectoid ferrite in a metallographic structure thereof, and which has a tensile strength of from 760 to 860 MPa and a fracture appearance transition temperature of not higher than 40° C.

The present disclosure is directed to a refractory metal core for use in forming varying thickness microcircuits in turbine engine components, a process for forming the refractory metal core, and a process for forming the turbine engine components. The refractory metal core is used in the casting of a turbine engine component. The core is formed by a sheet of refractory metal material having a curved trailing edge portion integrally formed with a leading edge portion.

Embodiments of systems and methods for tuning a turbine are provided. In one embodiment, a method may include receiving at least one of a measured operating parameter or a modeled operating parameter of a turbine during operation; and tuning the turbine during operation. The turbine may be tuned during operation by applying the measured operating parameter or modeled operating parameter or parameters to at least one operational boundary model, applying the measured operating parameter or modeled operating parameter or parameters to at least one scheduling algorithm, comparing the output of the operational boundary model or models to the output of the scheduling algorithm or algorithms to determine at least one error term, and closing loop on the one error term or terms by adjusting at least one turbine control effector during operation of the turbine.

An apparatus for aligning a wind turbine generator is disclosed. Preferably, the apparatus includes at least, but is not limited to, a support flange engaging a securement stud via a securement aperture, and a force displacement plate contacting the support flange. The preferred apparatus further includes an indexing means attached to the securement stud and force displacement plate, the indexing means configured to translate a rotational force to linear force capable of moving the support flange in relation to the securement stud.

A wind turbine with a tower; a nacelle supported by said tower; at least one unit to be cooled and arranged in the tower or the nacelle; a tower mounted heat exchange structure arranged outside the nacelle and tower; and a circuit facilitating a flow of a fluid medium between the at least one unit and the heat exchange structure. To improve thermal convection with the ambient space, the heat exchange structure comprises a set of panels mutually angled and extending outwards from the tower such that a flow of ambient air can pass transversely trough the panels and thereby cool the unit.

The present subject matter is directed to a lattice tower covering and/or assembly for a wind turbine. The lattice tower assembly includes a plurality of structural members connected together to define an open lattice tower. The structural members include a plurality of supports, a plurality of inner cross-support members, and a plurality of outer cross-support members. The inner and outer cross-support members are connected between the supports so as to define one or more openings. The lattice tower covering includes one or more panel elements. Each of the panel elements are retained in position between the supports and cover at least a portion of one or more of the openings. Further, the lattice tower covering has a surface area defined by the plurality of supports and the one or more panel elements.

Embodiments of the disclosure relate to ultrasonic inspection of turbine components. In one embodiment, a method for ultrasonic inspection of a turbine component can include mounting at least one array of transducer elements to the turbine component, (a) separately pulsing a transducer element of the at least one array of transducer elements to transmit a signal to the turbine component, (b) capturing reflected signals from the turbine component at each transducer element in the at least one array of transducer elements, repeating (a) and (b) for each of the other transducer elements in the at least one array of transducer elements, maintaining a constant relative position of the array of transducer elements with respect to the turbine component, analyzing the captured reflected signals using a computer, generating an image of the interior volume of the turbine component by reconstruction of the captured reflected signals and based at least in part on detecting an anomaly in the image of the interior volume of the turbine component, identifying at least one defect or failure in the turbine component.

A gas turbine that includes: a combustor coupled to a turbine that define a working fluid flowpath; a compressor discharge cavity; a staged injection system that includes the forward injector and a staged injector; a stator blade positioned extending across the working fluid flowpath between an inboard sidewall and an outboard sidewall. A one-way continuous coolant flowpath that includes: an intake section that comprises an upstream port connected to the compressor discharge cavity and a downstream port formed through one of the inboard and outboard sidewalls; an outtake section that comprises a downstream port connected to the staged injector and an upstream port formed through the same one of the inboard and outboard sidewalls; and a cooling circuit extending through an interior of the airfoil of the stator blade and connecting to the downstream port of the intake section and the upstream port of the outtake section.

A component for a gas turbine engine including a gas path wall having a first surface and a second surface. A cooling hole extends through the gas path wall from an inlet in the first surface through a transition to an outlet in the second surface. Cusps are formed on the transition.

A system includes a gas turbine system having a turbine combustor, a turbine driven by combustion products from the turbine combustor, and an exhaust gas compressor driven by the turbine. The exhaust gas compressor is configured to compress and supply an exhaust gas to the turbine combustor. The gas turbine system also has an exhaust gas recirculation (EGR) system. The EGR system is configured to recirculate the exhaust gas along an exhaust recirculation path from the turbine to the exhaust gas compressor. The system further includes a main oxidant compression system having one or more oxidant compressors. The one or more oxidant compressors are separate from the exhaust gas compressor, and the one or more oxidant compressors are configured to supply all compressed oxidant utilized by the turbine combustor in generating the combustion products.

An assistance device for an aircraft free-turbine turbine engine, the device including first electrical power supply for powering a winding of a starter rotary machine, referred to as a “first” winding, in order to provide first assistance in accelerating the gas generator of the engine. The device further includes a monitor for monitoring the first assistance, and a second power supply for electrically powering a second winding of the rotary machine to provide second assistance in accelerating the gas generator if the monitor observes that the first assistance is insufficient.

A method for operating a stationary gas turbine at partial load, having at least one compressor, at least one expansion turbine and a combustion chamber provided with at least one burner, which gas turbine further includes a hydraulic gap adjuster, wherein the method has the following steps: operating the gas turbine at partial load; operating the a hydraulic gap adjuster; during the operation of the hydraulic gap adjuster, increasing the fuel supply to the burner while increasing the temperature of the combustion gases which are guided to the expansion turbine.

A gas turbine engine duct turns radially inwardly in the downstream direction. The duct includes a plurality of radially extending stator vanes. A generally circumferentially extending splitter vane is provided between two circumferentially neighbouring stator vanes. The splitter vane improves the flow near to the radially inner wall of the duct. This can allow greater design freedom in the duct geometry.

A gas turbine engine includes a combustion section arranged between a compressor section and a turbine section that extend in an axial direction. A fan section is arranged upstream from the compressor section. An airfoil is arranged in one of the fan section, the compressor section and the turbine section. The airfoil includes pressure and suction sides extending in a radial direction from a 0% span position at an inner flow path location to a 100% span position at an airfoil tip. The airfoil has a leading edge that is projected onto a plane from various views and the plane is perpendicular to a viewing direction which corresponds to the various views. The plane is parallel with the axial direction in a 0° view. The various views include the 0° view which projects into an axial plane in the axial direction. A 90° view projects into a tangential plane in a tangential direction normal to the axial direction and views between the 0° and 90° views. The airfoil has a maximum leading edge projection in a 20° to 40° view. The radial direction is normal to the axial and tangential directions.

A 60-tonne truck carrying part of a wind turbine rolls over in Tasmania's central highlands, leaving a 68-metre blade across the road.

DAILY BRIEFING: A road in the Central Highlands has reopened after a truck carrying a 68-metre-long wind turbine blade lost its load, a 39-year-old woman dies after being hit by a car and CPSU encourages public sector workers to take part in climate protests.

Washington-based architect and designer Michael Mannhard has unveiled designs for BladeYARD, a proposal for a Burning Man 2021 installation built from recycled wind turbine blades. Created as a visual warning of the effects of climate change and shortsighted solutions, the installation mimics a large-scale ruin with parts of the blades submerged in the sands of Nevada’s Black Rock Desert.[...]

Vestibular apparatus -- Diseases.

GE Renewable Energy announced the shipment of the four tower sections that will be part of GE’s Haliade-X 12 MW prototype to be installed later this summer in Maasvlakte-Rotterdam (NL). The four segments at tower manufacturer GRI’s site in Seville, will be arriving in the Netherlands before the end of the month.

Global wind turbine makers are expanding manufacturing capacity in India to boost exports from the South Asian nation even as the country’s domestic industry faces headwinds.

A utility worker at the Delta 6 wind park in Brazil has been injured following yet another collapse of a General Electric (GE) turbine, bringing the total number of turbines to have failed in the America’s to five in 2019.

One or two new runners for the units at the 355-MW Brazeau Power Station in Alberta, Canada, would allow owner TransAlta Corp. to better optimize revenue and provide valuable ancillary services. Modeling of the various upgrade options allowed the utility to arrive at the most valuable solution.

The European Commission's Climate Change Committee has approved a transfer of US$19.3 million in funding for tidal energy developer Atlantis Resources from the Kyle Rhea project to its 398-MW MeyGen project.

Test operations are under way at Norte Energia's 11.2-GW Belo Monte hydropower plant, developer Norte Energia said in a statement.

GE Renewable Energy and Future Wind said this week that they have signed an agreement to install the first Haliade-X 12-MW wind turbine prototype in Maasvlakte-Rotterdam this summer. The deal includes five years of testing and a 15-year full service Operation and Maintenance agreement.

This week Siemens Gamesa said it signed its third contract in so many years with Voltalia in Brazil to supply wind turbines for wind farms the company is building.

Last week, LM Wind Power said it had successfully manufactured the world’s first wind turbine blade to surpass 100 meters in length.