A turbine has a rotatable outer casing with an inlet and an outlet therein. A casing rotation control causes the casing to rotate about a central point thereof such that the inlet consistently faces an incoming flow of ambient fluid. The casing has two spaced-apart portions in shapes of oppositely-disposed concave arcs (also referred to as “deflector plates” of a same circle. In some embodiments, each concave arc of the casing forms a unitary structure with a respective convex arc, the two spaced-apart convex arcs lying on either side of the outlet. In some embodiments, each concave arc is connected to a respective second concave arc at an endpoint thereof, the second concave arcs being rotatable about the point of connection.

A river, tidal, wave or ocean current or a wind turbine for generating electricity harnesses a predetermined minimum or baseload value of hydrokinetic/wind energy from variable water/wind flow. A harnessing module may have a waterwheel or propeller and a-generator or a waterwheel or propeller alone. A harnessing module harnesses wind or water energy and may be connected to a land module of electrical and mechanical apparatus by an electrical cable. Received variable electrical input from the harnessing module is converted to a-constant electrical frequency by a connected generator feeding a grid, for example, using a Hummingbird speed converter. The received variable electrical load power may be mechanically corrected by feedback to a Kingfisher converter. An output generator to output constant frequency may use a voltage regulator, a variable voltage transformer and a control motor to provide feed forward control.

A river, tidal, wave or ocean current turbine harnesses a predetermined minimum/maximum or baseload value of hydrokinetic energy from variable water flow. A wind turbine for generating electricity may follow similar principles. A harnessing module may consist of a waterwheel and a generator or a waterwheel alone. A harnessing module harnesses wind or water renewable energy and may be preferably connected to a land module of rotational speed control electrical and mechanical apparatus through a flexible electrical cable. Received variable electrical input from harnessing module is converted to a constant electrical frequency by a connected generator feeding a grid, for example, using the Hummingbird speed converter. The received variable electrical load power may be mechanically corrected by feedback to the Kingfisher converter while feedforward control of an output generator to output constant frequency may be provided using a voltage regulator, a variable voltage transformer and a control motor. The electrical input receiving land module may process multiple inputs from any types of harnessing modules including wind and water turbines.

A turbine has a rotatable outer casing with an inlet and an outlet therein. A casing rotation control causes the casing to rotate about a central point thereof such that the inlet consistently faces an incoming flow of ambient fluid. The casing has two spaced-apart portions in shapes of oppositely-disposed concave arcs (also referred to as “deflector plates” of a same circle. In some embodiments, each concave arc of the casing forms a unitary structure with a respective convex arc, the two spaced-apart convex arcs lying on either side of the outlet. In some embodiments, each concave arc is connected to a respective second concave arc at an endpoint thereof, the second concave arcs being rotatable about the point of connection.

A wave power generator comprising a chain drive arrangement. The Wave power generator comprising a float connected to one end of a retractable chain and a retractable device connected to an opposite end of the retractable chain.

A wind-turbine rotor blade, comprising a blade root and a blade tip, a flange arranged on the blade root side for fastening the rotor blade to a rotor hub of a wind turbine, and a pitch bearing for adjusting the angle of attack of the rotor blade. The rotor blade has a non-pitched carrier, on which the flange is embodied, wherein the pitch bearing is fastened to the carrier and is spaced apart from the flange toward the blade tip.

A wave power generator comprising a chain drive arrangement. The wave power generator comprising a float connected to one end of a retractable chain and a retractable device connected to an opposite end of the retractable chain.

A drive train arrangement preferentially for a wind power plant having a rotor shaft, a generator, and a gear, which is indirectly or directly connected to the rotor shaft and the generator. The gear is at least partly or completely integrated in the rotor shaft.

Disclosed are a wave force generation system for producing electric energy by a hydraulic circuit and a controlling method. The wave force generation system comprises a power conversion portion including a hydraulic cylinder which generates a hydraulic pressure by six degrees-of-freedom motion of a moving object floating on waves, wherein: when force is applied to the hydraulic cylinder in one direction thereof, the power conversion portion makes a fluid flow along a first path so as to produce electric energy; and when force is applied to the hydraulic cylinder in the other direction thereof, the power conversion portion makes the fluid flow through second path which makes the fluid bypass and flow in a direction opposite to the first path, whereby the fluid in the second path meets the first path and thus can produce electric energy.

A vertical axis wind turbine includes two or more cells arranged one above the other along a vertical machine axis, wherein each of the cells includes a plurality of vertical blades which are arranged within the cell distributed on a concentric circle about the machine axis and which are connected so as to be able to move together on this circle and which are rotationally fixed with a main shaft, and wherein the blades in the cell are each individually mounted so as to be able to rotate about a vertical axis of rotation which in particular runs internally through them.