An electricity generating apparatus has a turbine between two vertical water-tight towers on a floating base that may be managed to attain a buoyancy such that the towers protrude above a water surface and the turbine remains below the water surface. One tower has an upward extending air conduit with an air pump driven by wind vanes at an upper region. The turbine is adapted to be driven by both wave motion and by tide currents, and an air manifold beneath the turbine, fed with air from the air pump, feeds air to aid in turning the turbine, which in turn drives a generator in one of the towers.

A multi-source power generation system to generate electricity by utilizing a combination of renewable energy sources such as wind, solar and wave energy is disclosed. The power generating system comprises a frame including a float body and a cylindrical body integral to the float body is submerged below the surface of sea water. A solar power generator comprising solar panel is mounted above the float portion, which is configured to receive the solar power energy and produce electrical potential. A wave energy generator is disposed inside the cylindrical body to harness wave energy from wave motion. A wind turbine disposed on the float body, which is configured to harness wind energy from wind. The cylindrical body comprises a cylindrical compartment including a cylindrical magnet which is configured to move in and out of a coil to generate electrical energy.

Multi-resonant control of a 3 degree-of-freedom (heave-pitch-surge) wave energy converter enables energy capture that can be in the order of three times the energy capture of a heave-only wave energy converter. The invention uses a time domain feedback control strategy that is optimal based on the criteria of complex conjugate control. The multi-resonant control can also be used to shift the harvested energy from one of the coupled modes to another, enabling the elimination of one of the actuators otherwise required in a 3 degree-of-freedom wave energy converter. This feedback control strategy does not require wave prediction; it only requires the measurement of the buoy position and velocity.

A wind turbine blade for a wind turbine is a shell structure of a fiber-reinforced composite and comprises a root region and an airfoil region. The root region has a ring-shaped cross section and comprises a cylindrical insert 7 embedded in the fiber-reinforced polymer so as to substantially follow the circumference of the root region. The cylindrical insert is provided with a number of mutually spaced threaded bores 12, 15 in a first end 9 thereof being accessible from the outside.

A low-head and high flow water turbine machine comprises a water-guiding base having a top plate, a bottom plate, an accommodating space defined therein, an inlet and an outlet respectively arranged at upstream side and downstream side, and a first and a second lateral plates respectively having a first and a second water-guiding walls that are respectively extending inward toward circumference of the accommodating space, a water turbine arranged in the accommodating space and having multiple blades, and a cylindrical-shaped gate shell passing through the top plate and slidably coupled to circumference of water turbine around upstream side wherein an opening degree is adjusted through sliding the gate shell for adjusting cross-sectional area of stream thereby controlling stream discharge entering to the water turbine, switching off rotation of the water turbine, and adjusting water level at high water level state at upstream side according to the stream discharge requirement.

The hydroelectric power generating system includes a reservoir for retaining a body of water and an outer vessel that surrounds a peripheral wall of the reservoir. A circumferential canal extends between an upper portion of the reservoir peripheral wall and the outer vessel. One or more penstocks extend below the canal between the reservoir and the outer vessel. Each penstock has one or more hydroelectric turbine generators installed therealong. A plurality of primary wind turbines can be disposed on a peripheral wall of the reservoir and a plurality of air columns can be disposed within the reservoir to generate auxiliary power.

The present invention relates to a power generating system utilizing current around a structural body. The power generating system is disposed in a flow field, wherein the streams of the flow field flow along a main fluid flow direction. The power generating system comprises a supporting device and a power generating device. The supporting device comprises a supporting body, wherein at least one of a stream-facing region, a side-stream region, and a vortex region is defined on the supporting body. The power generating device comprises at least one power generating unit and a power storage unit, wherein the power generating unit is disposed in at least one of the stream-facing region, the side-stream region, and the vortex region.

The modular platform for offshore constructions, composed of more than two separate buoyancy elements partially immersed in water, which move along with the water wave movement and which, in the part above the water level, are connected to the structural elements forming a rigid horizontal spatial structure, characterized in that the buoyancy element (1) is given the shape of a cuboid or cylinder having at least one vertical hollow (2) to accommodate the structural element, i.e. piston (3), which forms the axis along which the buoyancy element (1) moves, and which is connected to the horizontal structural element (4) fitted to take external loads.

The present invention relates to wind turbine towers and in particular to such towers having a damper for use when erecting the tower and prior to installing a nacelle on the top of the tower. The invention also relates to a method for damping wind turbine towers. One aspect of the invention involves a wind turbine tower (2) with an upper tower structure (24) and a damper (5) comprising, a liquidless damper housing (7,8) fixed to the upper structure, a cylindrical interior surface of the damper housing, and a damper mass having a horizontal extent which is less than a horizontal extent of the cylindrical interior surface of the damper housing, and at least one shock absorbing structure, where the damper mass is arranged to, when the tower oscillates, essentially stay in a standstill location, whereby a relative movement between the tower and the damper mass may cause an impact with between the tower mass and the shock absorbing structure dependent on the magnitude of the amplitude of the tower oscillation. A main technical progress is that the damper does not need detailed tuning to the towers natural frequency. As long as the damper mass is sufficient, it may be used for damping a range of tower sizes and heights.

Apparatus for converting wave motion on a body of water into electrical power, includes a floatable housing in which an electrical power generating unit is disposed. The electrical power generating unit includes a rotatable axle to which at least one electrical generator is connected. A weight is connected to the rotatable axle by an arm, so that when the weight rotates due to wave motion the electrical generator generates electrical power. In one embodiment gearing connects the electrical generator to the axle. In another embodiment the weight rolls on the floor of the housing. And in another embodiment the weight includes at least one battery.