Provided is a composite material for a wind turbine blade, the composite material including a plurality of rigid elements and plurality of flexible elements, wherein each flexible element is arranged between two rigid elements and is connected thereto such that the rigid elements are flexibly connected to each other by the flexible elements. The flexibility of the composite material can be achieved by using the interspaces between the rigid elements. Therefore, when the composite material is placed on a curved surface, hollow spaces between the rigid elements may be reduced or avoided.

A rotational movement assisting device includes: a pipe-type rotary shaft having a through-hole formed therein; a rotational blade coupled so as to rotate the rotary shaft by using a rotation coupling unit provided on an uppermost end of the rotary shaft; a base unit erectly provided by using a rotation installation unit such that the rotary shaft is rotatable; a dual partition wall-type reservoir unit provided at the rotary shaft between the rotational blade and the base unit so as to be coupled to be rotatable; a multistage expandable horizontal rotation unit communicating with the reservoir unit such that circulating water may be introduced thereinto, and having an inner space part formed therein; a power generator provided on an upper surface of the base unit.

A wind funnel includes airflow chambers. Each airflow chamber has sidewalls forming an external cross-sectional area greater than an internal cross-sectional area. A wind turbine engine includes a turbine drum and the wind funnel. The turbine drum has turbine blades extending from the drum that rotate a centrally positioned vertical shaft. The airflow chambers conduct external air to, and increase air pressure compared to ambient air pressure by a predetermined ratio at, the turbine blades.

A wind turbine includes at least one wind speed sensor, a number of pitch-adjustable rotor blades, and a control system for changing the pitch of the rotor blades and/or a generator torque. The the control system determines at time intervals an error parameter as the difference between an estimated wind speed and a measured wind speed as measured by the wind speed sensor. Then, based on a number of pre-defined wind speed intervals, a group of error parameters is obtained over time for each wind speed interval. For each wind speed interval and for each group of error parameters a wind speed offset is determined based on the average of the error parameters within the group which wind speed offsets are used in adjusting the measured wind speed.

A powered augmented fluid turbine for generating electricity from a fluid in motion comprising: a central annular ducted channel extending between an inlet distribution header and an outlet distribution header, the channel comprising a converging section configured to accelerate the fluid received at the inlet distribution header, a turbine assembly for generating electricity, and a diffuser section configured to decelerate the fluid before it exits at the outlet distribution header; a recycle line for transporting the exiting fluid to the inlet distribution header in a closed-loop configuration, the recycle line comprising a recycle line propulsor controllable by a recycle line controller and a recycle line heat exchanger; and a compressed fluid distribution line configured to pressurize the fluid in motion by transporting a compressed fluid from a compressed fluid source to the inlet and outlet distribution headers, the compressed fluid distribution line controllable by at least one pressure controller.

Provided is a method of manufacturing a wind turbine rotor blade, which method includes the steps of preparing a mold by forming a partial negative leading-edge profile in a first mold half, which partial negative leading-edge profile includes a plurality of first indentations along a leading edge region of the first mold half; forming a partial negative leading-edge profile in a second mold half, which partial negative leading-edge profile includes a complementary plurality of second indentations along a leading edge region of the second mold half; and wherein the combined shape of a first indentation and a complementary second indentation corresponds to the negative shape of a leading-edge fin that will extend radially outward from the body of the rotor.

A fluid turbine is described herein. The fluid turbine is subject to internal stresses, which can increase the frequency of maintenance or cost of construction, including fixing or replacing one or more components or increasing the amount of material used. One or more support arms of the fluid turbine can be provided in a given manner to generate a force during rotation that opposes one or more other forces, thereby reducing or eliminating the internal stresses exerted on the fluid turbine. For example, the one or more support arms can be provided in a given orientation or with given masses to generate the opposing force. In another example, the one or more support arms can be shaped or angled to generate an aerodynamic force.

Unique systems, methods, techniques and apparatuses of hybrid power plants are disclosed. One exemplary embodiment is a hybrid power plant system including a plurality of hybrid generation units each including an AC collection bus, an AC power source, an AC-AC power converter coupled to the AC power source and AC collection bus, a DC power source, a DC-AC converter coupled to the DC power source and the AC collection bus, an energy storage device, and a power transformer coupled to the AC collection bus and structured to receive AC power from the AC collection bus, step up a voltage of the received AC power, and output medium voltage AC (MVAC) power.

The present invention relates to wind turbine blade and a method of manufacturing the wind turbine blade. An aerodynamic shell is provided with a recess (70) at its inner surface, the recess (70) extending with-in the shell along a spanwise direction of the blade. A first region of the recess (70) has a first width and a second region of the recess (70) has a second width exceeding the first width. A transition region is provided between the first region and the second region of the re-cess. A first and a second spar cap (80, 82) are arranged within the shell.

A pitch varying device, a pitch varying method and a pitch varying control device for a wind turbine blade and a wind turbine are provided. The blade pitch varying device includes: a disc-type driving structure perpendicular to an axis of a pitch bearing, a track surrounding the axis of the pitch bearing being provided on the disc-type driving structure; a first linear telescopic driving mechanism connected to the track through a first clamping member capable of clamping the track, and the first linear telescopic driving mechanism and the first clamping member being connected through a hinge connection; and a second linear telescopic driving mechanism connected to the track through a second clamping member capable of clamping the track, and the second linear telescopic driving mechanism and the second clamping member being connected through a hinge connection.