Mitsubishi Heavy Industries Limited

Mhi Vestas Offshore Wind A/s

Tomohiro Numajiri

Yoshihiro Fujioka

Kenji Ito

Masakazu Kamibayashi

Masaaki Shibata

Hisao Miyake

Masahiro Kawai

Yoshihiko Hayashi

Takatoshi Matsushita

Takeshi Matsuo

Yoshiyuki Hayashi

Yasushi Okano

Yoshitomo Noda

Seita Seki

Ikuo Honda

Haruhiko Hirano

Atsushi Imanaga

Shinsuke Sato

Kodai Shimono

Taisuke Nakamura

Atsushi Yuge

Yoshihiro Tanabe

Shin Nakayama

Shigeto Hirai

Katsuhiko Shoda

Hideaki Nishida

Nobuyasu Nakamura

Yasuyoshi Tozaki

Chuuhachi Gotou

Emi Torii

Masao Komatsu

Masuo Tada

Yasuto Fujino

Mioko Matsuda

Hiroyuki Kayama

A method of performing maintenance on a wind turbine component () of a wind turbine () having an integrated lifting apparatus (). The method includes lifting a first temporary support () using the integrated lifting apparatus (), coupling the first temporary support () to the nacelle () or the hub () and the integrated lifting apparatus (), removing the wind turbine component () using the integrated lifting apparatus () and the first temporary support () in combination. The method may further include installing a replacement wind turbine component () using at least a part of the integrated lifting apparatus () and the first temporary support () in combination, decoupling the first temporary support () from the nacelle () or the hub () and the integrated lifting apparatus (), and removing the first temporary support () from the wind turbine () using the integrated lifting apparatus (). A system for performing maintenance on a wind turbine component () is also disclosed.

Method and apparatus of performing maintenance on a wind turbine component

A floating-body type wind turbine power generating apparatus includes a floating body floating on a water surface; and a wind turbine disposed on the floating body and configured so that at least a part of the wind turbine is submersible. The wind turbine includes: at least one blade; a hub to which the blade is mounted; a tower erected on the floating body; a nacelle disposed on the tower; a first electrical device disposed inside the hub or the nacelle; and a second electrical device connected to the first electrical device via a cable and configured to be movable relative to the tower in a vertical direction so as not be submerged upon submergence of the wind turbine.

Floating-body type wind turbine power generating apparatus and method of transporting components of the same

A structure for a nacelle cover connection portion of a wind turbine generator includes a lengthy first angled member fixed to an inside surface of a nacelle cover and forming an upper end portion of a side wall panel; and a lengthy second angled member fixed to the inside surface and forming a lower end portion of a roof panel. An upper surface of the first angled member and a lower surface of the second angled member are aligned with and fixed to each other. A covering portion covering the upper end portion from the outside of a nacelle is provided at a predetermined interval from the same and integral with the lower end portion so as to protrude to the outside of the nacelle cover farther than the lower end portion. A packing is interposed between the upper and lower surfaces.

Structure for nacelle cover connection portion of wind turbine generator

If blades have been struck by wind that has reached a power reduction start wind speed that is lower than a conventional cut-out wind speed at which torque acting on a main shaft reaches the torque limit, a wind turbine generator performs torque reduction control for causing the change in the torque when wind speed is higher than the power reduction start wind speed to be different from change in the torque when wind speed is lower than the power reduction start wind speed so as to prevent the torque from exceeding the torque limit at the conventional cut-out wind speed. For example, if the wind striking the blades reaches the power reduction start wind speed, the wind turbine generator sets the slope of change in torque lower than that before the power reduction start wind speed is reached. Accordingly, the wind turbine generator can reduce the load acting on a device and suppress a reduction in power even if the blades are struck by strong wind.

Controller for wind turbine generator, wind turbine generator, and method of controlling wind turbine generator

The present invention provides a composite material panel structure and a manufacturing method thereof with which an anti-lightning function can be realized without adding a separate anti-lightning structure to the composite material panel structure. In a composite material panel structure formed from a composite material panel containing reinforcing fibers, the composite material panel includes: a fiber-reinforced base material impregnated with a matrix resin; a conductive mesh sheet disposed on one surface side of the fiber-reinforced base material; and a bag film disposed on the one surface side of the fiber-reinforced base material so as to sandwich the conductive mesh sheet. The conductive mesh sheets of a plurality of the composite material panels are electrically connected to each other.

Composite material panel structure and manufacturing method

To provide a nacelle roof structure of a wind turbine generator, where the nacelle roof structure is capable of reducing stress concentration on joints of a roofing member divided into multiple parts to accommodate growing size of a nacelle as well as improving transport efficiency of the roofing member. A nacelle roof structure of a wind turbine generator, with a top face of a nacelle being covered with a plate-type roofing member (), in which the roofing member () has a joining structural portion () in which roof shingles () that divide the roofing member into a plurality of parts in a main-shaft direction are combined and plate couplings provided at opposite ends in the main-shaft direction are fastened together by being laid one on top of another; and two or more of the roof shingles () are equal in cut length in the main-shaft direction.

Nacelle roof structure of wind turbine generator

A testing method for the bolt to be used under the conditions of excessive wind force by which bolts made of Cr&#x2014;Mo steel can be separated into a group of bolts usable in cold areas and a group of bolts unusable in cold areas without conducting Charpy impact test involving complicated operation, specifically, a testing method for determining whether bolts made of heat-treated Cr&#x2014;Mo steel are usable or unusable in cold areas, wherein the determination is conducted on the basis of both J parameter calculated by formula: J=(Si %+Mn %) (P %+Sn %) 104 (wherein P %, Si %, Mn % and Sn % are contents (mass %) of phosphorus (P), silicon (Si), manganese (Mn) and tin (Sn) respectively as disclosed in the inspection certificate of the Cr&#x2014;Mo steel) and bolt diameter.

Method for inspecting bolts

A method for attaching a rotor of a wind turbine generator and a method for constructing a wind turbine generator are provided, with which the rotor blades can be prevented from breaking and with which the construction costs can be reduced. The present invention includes: an assembly step (S) in which a plurality of wind-turbine rotor blades are attached to a rotor head to assemble the rotor on the ground; a wire attaching step (S) in which a first wire is attached to a first hoisting portion provided on a rotation axis of the rotor and in which a second wire is attached to a second hoisting portion provided at a position away from the rotation axis; a hoisting step (S) in which the rotor is hoisted with the first wire; a rotor raising step (S) in which the first wire is extended so that the rotor is hoisted with the second wire; and a rotor attaching step (S) in which the rotor hoisted with the second wire is attached to the nacelle.

Method for attaching rotor of wind turbine generator and method for constructing wind turbine generator

A pitch driving unit according to the present invention is equipped with hydraulic actuators that change the pitch angles of wind turbine blades; a hydraulic pump that supplies oil to the hydraulic actuators; a high-pressure oil line that guides the oil discharged from the hydraulic pump to the hydraulic actuators; a low-pressure oil line that returns the oil discharged from the hydraulic actuators to the hydraulic pump; and a pressure control unit that stores a surplus amount of the oil and that refills the low-pressure oil line with the oil so as not to generate negative pressure at an oil intake portion of the hydraulic pump, wherein the hydraulic actuators, the hydraulic pump, the high-pressure oil line, the low-pressure oil line, and the pressure control unit constitute a closed hydraulic circuit that does not open to the atmosphere, the closed hydraulic circuit being filled with the oil.

Pitch driving unit for wind-turbine rotor blade and wind power generator equipped with the same

There is provided a method for hoisting and lowering a device in a rotor head of a wind turbine generator, that can easily perform a device hoisting and lowering operation in the rotor head without an external crane. The method for hoisting and lowering a device in a rotor head includes a step of mounting a temporary winch rail to a rail support portion previously provided in the rotor head, a step of installing a temporary winch on the temporary winch rail, a step of opening a maintenance hatch provided in the rotor head, and a step of hoisting and lowering a replacement device to be attached or removed in the rotor head through a hoisting and lowering opening in the maintenance hatch by the temporary winch.

Method for hoisting and lowering device in rotor head of wind turbine generator

Provided is a wind turbine generator in which the intake air temperature of an air-cooled heat exchanger disposed in a nacelle is decreased to allow efficient heat exchange. A wind turbine generator that generates electric power in such a manner that a rotor head that rotates when receiving wind power drives a generator installed inside a nacelle, the nacelle being installed at the upper end of a tower that is vertically erected on a foundation, and the wind turbine generator including a closed-circuit lubricating-oil circulation system in which lubricating oil circulates through devices installed inside the nacelle, wherein an air-cooled heat exchanger installed in the lubricating-oil circulation system to cool the lubricating oil by heat exchange with air is provided in a region separate from nacelle air.

Wind turbine generator including air-cooled heat exchanger

The present invention provides a pitch drive apparatus of a wind generator and the wind generator constituted not to affect a main shaft or a gear box, and capable of preventing reliability from being deteriorated. The pitch drive apparatus includes a wind turbine blade () having a base portion () mounted so as to be turnable around an axis center L with respect to a rotor head (), an electric drive member having an output shaft () mounted on the rotor head () so as to extend in a direction along the axis center (L), a lever () having one end fixed to the output shaft () and extending in a direction intersecting with the output shaft (), and a connecting link () disposed so as to extend in a direction intersecting with the output shaft (). One end of the connecting link () is rotatably mounted on a free end of the lever () and the other end of the connecting link () is rotatably mounted on a drive position P of the wind turbine blade ().

Pitch drive apparatus of wind generator and wind generator

There is provided a yaw rotation control method for a wind turbine generator that does not require a yaw motor and is advantageous for a reduction in cost and a reduction in size and weight of a nacelle. A control unit performs, according to a deviation between wind direction information (&#x3b8;w) obtained from a wind direction detecting unit and a present state yaw angle (&#x3b8;z) obtained from a yaw rotating position detecting unit, yaw rotation control for outputting pitch angle command values (&#x3b8;, and &#x3b8;) of yaw rotation to a pitch driving unit and directing front surfaces of rotation surfaces of wind turbine blades at the time of start. This yaw rotation control includes a step of controlling pitch angels of the wind turbine blades at a predetermined azimuth angle.

Wind turbine generator and yaw rotation control method for wind turbine generator

A pitch drive device of a wind turbine generator and a wind turbine generator that have simple and inexpensive structures and that are capable of preventing a decrease in the reliability of the pitch drive device are provided. There is provided a cylinder () configured to change a pitch angle by driving a wind-turbine rotary blade () to turn around an axis with respect to a rotor head (); and a cylinder bearing () configured to support, in a turnable manner, a trunnion () extending from the cylinder () substantially parallel the axis of the wind-turbine rotary blade (), wherein anti-vibration rubber () configured to elastically support the trunnion () is provided on a support section configured to support the trunnion () of the cylinder bearing ().

Pitch drive device of wind turbine generator and wind turbine generator

A pitch drive device of a wind power generator capable of preventing the loss of reliability of the pitch drive device with a simple structure and a wind power generator are provided. A rotor head of a wind power generator in which a plurality of wind turbine blades are radially attached around a rotation axis is formed by joining a plurality of separately formed front rotor head and rear rotor head, and joint portions of the front rotor head and the rear rotor head are formed in a plane intersecting the rotation axis.

Growing community of inventors

Tokyo, Japan

Tomohiro Numajiri