143 results about "Wind turbine design" patented technology

A hybrid blade wind turbine device formed of at least a pair of straight outer airfoil blades, and a pair of inner helical wing blades, as supported for rotation within a safety protective cage structure, which wind turbine can be mounted in the vertical, horizontal, or other aligned operational positions. The inner helical half wing blades, being preferably somewhat shorter than the length of the outer airfoil blades, act to “regularize” the swirling wind regime flowing through the hybrid wind turbine, so as to maximize the efficiency of the outer airfoil blades. The helical half wing blades can be formed of individual segmented vane segments to provide improved operational capabilities for the overall hybrid wind turbine. To best harness annualized available wind conditions, the hybrid wind turbine can be customized, through modification of the number of vane segments, the selection of the specific shape of the outer airfoil blades, and the specific operational positioning of the outer airfoil blades. Alternatively, the helical half wing blades can be formed as generally smooth-walled blades.

A wind turbine system includes a variable blade assembly including adjustable sails and wing shaped masts expanding the wind velocity capture envelope. The blade assembly turns a hydraulic pump, which pressurizes fluid and stores the pressurized fluid in a chamber in the support tower. Pressurized fluid is directed via an electronically controllable proportioning valve to a hydraulic motor which is coupled to an electric generator. A computer control module operates the proportioning valve regulating pressure to the hydraulic motor, maintaining generator rotational speed, and providing consistent output frequency to the power grid. Stored energy in the high pressure tank is used to continue generator operation after the winds cease, allowing early warning notification to the power management system of impending power loss. Residual pressure maintained in the high pressure tank allows restart operations via hydraulic pressure rather than power grid energy drain. On site high energy capacitors store additional energy.

The invention relates to a wind turbine blade for a wind turbine, having a tip end area and a root end area, and a lightning protection system, said lightning protection system comprising at least one metal foil, wherein said metal foil extends continuously from the tip end area to the root end area of the blade and wherein the metal foil is arranged in proximity to the outer surface of the blade, so that the metal foil is adapted to function as a receptor of a stroke of lightning and as a down conductor.

A wind turbine comprising a wind turbine blade with high lift and/or low solidity is provided. The blade is directed towards pitch regulated wind turbines, which are operated at variable rotor speed and have blades longer than about 30 meters. The blade is for example advantageous in that it may provide reduced extreme and fatigue loads at the same or near the same power production.

A wind turbine for a diffuser augmented wind turbine assembly is provided. The wind turbine comprises a wind turbine housing, a hub mounted within the wind turbine housing, and a plurality of blades rotatably coupled with the hub and radially extending from the hub. The plurality of blades includes a first blade and a second blade, wherein the first blade includes a surface area and/or a maximum width that is greater than a surface area and/or a maximum width of the second blade to increase the efficiency of the diffuser augmented wind turbine assembly in variable speed winds.

A method for operating a wind turbine is disclosed. The wind turbine comprises a rotor having a set of wind turbine blades, said rotor being mounted on a tower. The method comprises the steps of: Providing a curve defining optimal pitch angle as a function of tip speed ratio for the wind turbine blades or as a function of wind speed. Modifying at least a part of said optimal pitch angle curve by applying a safety buffer, e.g. at tip speed ratios and/or pitch angles where there is a risk that the blades may stall and/or that overload is caused to the wind turbine, thereby obtaining a safety modified pitch angle curve. Operating the wind turbine in accordance with the safety modified pitch angle curve. Measuring one or more parameters providing information regarding wind conditions and/or loads on one or more components of the wind turbine, during operation of the wind turbine. Adjusting the safety buffer, based on said measurements, thereby obtaining an adjusted pitch angle curve, and operating the wind turbine in accordance with the adjusted pitch angle curve. The safety buffer is applied in order to ensure that the blades of the wind turbine do not stall and/or that the wind turbine is not overloaded, but it has the effect that the wind turbine is operated in a suboptimal manner from an energy production view. Since the safety buffer is adjusted based on measured parameters, it can be reduced if it is detected that the actual operating conditions are less severe than expected. This allows the wind turbine to be operated in a more optimal manner, thereby increasing the energy production of the wind turbine.

The present invention relates to a wind turbine structure comprising a wind turbine tower with a nacelle arranged on the top to which a rotor hub with one or more rotatable mounted wind turbine blades are mounted which form a rotor plane. A floating foundation is mounted to the bottom of the wind turbine tower and the pitch and/or yaw system are used to regulate the position of the wind turbine structure. A control unit detects the relative movement of the wind turbine structure in two axial directions and activates the pitch or yaw system to move the wind turbine structure into an equilibrium position. This reduces the directional movement of the wind turbine structure so that it remains in a stable equilibrium position. This also reduces the oscillating movement and tension forces in the anchor chains.

The invention relates to a wind turbine blade comprising lightning protection means. At least one section of the tip of said blade is made in solid metal and is included as part of said lightning means. The invention also relates to a wind turbine, a method of providing lightning receptor means to a wind turbine blade and use hereof.

A new reduced cost easily manufactured light weight wind turbine design combining the use of downwind passive yaw, large take off rim on the outside of the semi rigid sails, a new method of furling or changing sail AOA, new semi rigid sail design, and new tower design that allows passive yaw for high installation of wind wheels to gain energy from higher wind speeds.

Combining these features dramatically lowers weight/simplifies manufacture/avoids need for expensive composite materials/avoids the need for heavy high reduction gearboxes/reduces friction losses to air/reduces noise/reduces bird strikes/catches more energy per area of sails/and ultimately reduces cost in US$ per kwh generated ratio.

The invention relates to a control apparatus and method for controlling the rotor blades of a wind turbine, and in particular to controlling the rotor blades during an extreme wind event. An extended mode of operation of the wind turbine rotor beyond the cut-out wind speed is provided. In the extended mode of operation, the pitch of the wind turbine blades is actively controlled so that the rotor and the generator idle at a designated rotational speed. The rotational speed may be relatively high, say 15 to 20% of the nominal speed, compared with minimal speeds experienced by purely feathered wind turbine blades, and may be further controlled as a function of the incident wind speed. Output power control in the extended mode may be zero but is preferably a low, but non-zero value. The output power so produced may then be used as an auxiliary power source for controlling the wind turbine in situations where the utility grid fails.

A control method for a wind turbine, in particular for a wind turbine blade is described. The control method makes use of the blade mode shapes, or natural vibration shapes, of the blade to detect the excitement level of the blade natural vibrations, and controls active lift devices on the blade in an effort to reduce the excitement levels, to reduce loading in the blade and the overall wind turbine structure. There is also provided a method of designing a wind turbine blade for use in such a method.

The Cellular Mobile Radiotelephone Tower Wind Turbine (CMRTTWT) specifically is an innovative method of harvesting available wind power around CMRT towers. The CMRTTWT addresses the base station power needs of the Cellular Mobile Radiotelephone (CMRT or Cell Phone) industry, providing clean on-site power generation for reduced environmental impact and for improved availability during disasters (natural or man-made). This invention extends the design of the CMRT tower to include a wind turbine and the associated structural and electrical modifications to accommodate that wind turbine. This wind turbine is designed to provide approximately the daily power demands for the CMRT tower system; thus the turbine would be small enough to be mounted on the tower without interfering with the operations of the antennas. By using the turbine as a constant power source, clean electricity is directly harvested from suitable velocity winds at the higher altitudes of the tower. Once the invention is installed, the electricity required from the power grid is reduced significantly. By designing the system to vary the number of network connections based upon the power available from the turbine, constant operation of at least some capacity is possible even without power from the electrical grid; this is a tremendous advantage for maintaining communication capability during and immediately following disasters (both natural and man-made). The invention creates a low-cost way to harness readily available wind power to generate much needed electrical power for the CMRT industry.

The invention relates to an eddy generator for a wind turbine blade. The eddy generator comprises multiple fins, and each fin is a triangular plate part with a circular corner as a top corner. According to the eddy generator, stalling can be effectively delayed, the pneumatic performance of the blade is improved, the situation can be reduced that the power generation loss of a wind turbine is caused by blade surface pollution, and the eddy generator can be applied to power increase transformation of the wind turbine blade which is operated. The invention further relates to a method for determining the mounting position of the eddy generator on the wind turbine blade and a method for installing the eddy generator on the wind turbine blade. According to the methods, the mounting and positioning process is precise and reliable, and the mounting efficiency is high.

A wind turbine is disclosed that includes a spaceframe mounted atop a support structure. The spaceframe houses and is integrated with a wind turbine drivetrain. The spaceframe transfers primary rotor loads and drivetrain torque to the support structure.