Patent application number | Description | Published |
20080247875 | HORIZONTAL AXIS WIND TURBINE - The purpose of the invention is to protect, in a horizontal axis wind turbine with an exhaust aperture for exhausting air from within the nacelle, the exhaust aperture and the internal structures from storm winds through facing the exhaust aperture away from the storm wind, even when storm winds are received from all directions relative to the nacelle. A rotary duct | 10-09-2008 |
20080304964 | HORIZONTAL AXIS WIND TURBINE - To provide a horizontal axis wind turbine capable of reducing flutter, and by extension, reducing the load on the wind turbine, without controlling the yaw, regardless of the direction of the wind relative to the nacelle. When the wind speed is above a specific value, the yaw angle of the nacelle is held constant, the blade pitch angle is controlled according to the yaw angle Y of the wind direction relative to the nacelle, and the rotor is allowed to rotate freely. Even when the yaw angle of the nacelle is held constant, allowing the rotor to rotate freely makes it possible to reduce the load by avoiding flutter. | 12-11-2008 |
20090047129 | Horizontal axis wind turbine - Disclosed a horizontal axis wind turbine including: a rotor; a nacelle; a tower; an independent pitch control device; and a yaw control device, wherein the horizontal axis wind turbine is an up-wind type one including a waiting mode, wherein (1) the independent pitch control device performs a first step of changing all the blades to be in feathering states when the wind speed exceeds the predetermined value, a second step of changing the blades to be in reverse feathering states one by one sequentially, and a third step of holding all the blades in the reverse feathering states, and (2) the yaw control device controls a yaw brake to take a braking value allowing the yaw rotation when the wind speed exceeds the predetermined value, wherein the rotor is allowed to swing a leeward of the tower by executing the control operations (1) and (2) as the waiting mode. | 02-19-2009 |
20090241659 | METHOD FOR MEASURING THE TURBULENCE INTENSITY OF A HORIZONTAL AXIS WIND TURBINE - The present invention provides a method for measuring the turbulence intensity of a horizontal axis wind turbine that is capable of accurately obtaining the value of the turbulence intensity without the effect of the rotor and by taking into consideration the motion of the nacelle. In the method for measuring the turbulence intensity of a horizontal axis wind turbine, with the nacelle located on the upwind side of the rotor of the horizontal axis wind turbine, measurement values are obtained from an anemometer that is located on the nacelle and an acceleration sensor that is fastened to the nacelle, and the absolute value of the turbulence intensity is calculated based on the measurement values from the anemometer and the measurement values from the acceleration sensor. As a result, it is possible to accurately calculate the absolute value of the turbulence intensity that includes the effect of the movement of the nacelle. | 10-01-2009 |
20100296932 | HORIZONTAL AXIS WIND TURBINE - The object of the invention is to construct a horizontal-axis wind turbine comprising a dual-system pitch drive unit for one blade that is independent up to the transmission mechanism or a dual-system yaw drive unit for one wind turbine nacelle that is independent up to the transmission mechanism, and to provide the dual system with new applicability. The horizontal-axis wind turbine of the present invention has a hub | 11-25-2010 |
20110140445 | Offshore Wind Turbine - An offshore wind turbine is comprised of a tower structure body configured with a tower and foundation, a rotor supported at the tower top, a power generator generating electricity by the rotation of the rotor, and a power converter converting electricity from the generator. A cavity is formed in the tower and foundation, and an internal space configured therewith is divided into upper and lower chambers by a bulkhead with first and second air vents between or in either of the tower and foundation. The converter is disposed in the upper chamber. An air circulating channel and air blower (e.g., air exhaust fan) are provided wherein air is circulated from the converter to the lower chamber through the first air vent, then to the converter through the second air vent. An air inlet is disposed at a lower level of an air outlet, or a partition member is provided therebetween. | 06-16-2011 |
20110299986 | HORIZONTAL AXIS WIND TURBINE APPARATUS - The object of the invention is to provide a control apparatus C of a horizontal axis wind turbine apparatus WTG that calculates the value en of a pitch angle command for each blade based on the rate of change ΨD of the azimuth angle Ψ of a Nacelle N and the rotor azimuth angle φ of the blades B | 12-08-2011 |
20110299998 | HORIZONTAL AXIS WIND TURBINE - This horizontal axis wind turbine comprises a plurality of yaw motors that are provided on one of either a nacelle or a tower, and a gear | 12-08-2011 |
20120074710 | WIND POWER GENERATOR - This wind power generator is a wind power generator that comprises a rotor | 03-29-2012 |
20120107126 | WIND POWER GENERATOR - This wind power generator comprises: a nacelle that houses a generator; a tower, the top end section thereof being connected to the nacelle and the bottom end section being fastened to a base section; and a rotor that is located on the downwind side of the nacelle during normal operation, and that by receiving the force of the wind and rotating, drives the generator. The rotor has a hub that is supported such that it can rotate, and a plurality of blades that are arranged such that they extend radially from the hub. The blades, when not loaded, are pre-bent blades that are formed such that the middle section of each blade is curved outward with respect to a straight line that connects the root end section of the blade that is attached to the hub and the tip end section on the outer diameter side of the rotor, with a specified coning angle being applied to the blade. | 05-03-2012 |
20140091571 | Wind Turbine System - A wind turbine system includes a tower, a nacelle which is supported on the tower, a plurality of blades which are rotatably supported to the nacelle via a hub, and a generator which generates electricity by rotating the blades, wherein in case the tower shifts from vertical direction, the wind turbine system is controlled so that a force with an opposite direction to the tower shifting direction is added by wind. | 04-03-2014 |