An ocean current power plant with an electric generator and a turbine, which comprises a stator and a rotor that is rotatable about the stator, for driving the electric generator. The rotor comprises a plurality of rotor arms, which respectively have a carrier mechanism and multiple rotor blades that are pivotably mounted on the carrier mechanism.

The present invention provides a large tidal current energy generating device and an assembly platform (1) thereof. At least one horizontal axis hydro-generator (2) is installed in the assembly platform (1). The assembly platform (1) includes at least four fixed piles (11), at least two force-bearing blocks (12), at least two force-bearing supports (13), and supports (14). The at least four fixed piles are connected through the supports to form an installation space (15). The at least one horizontal axis hydro-generator is installed inside the installation space. One end of each fixed pile is driven to be fixed to a seabed and the other end extends to be above a water surface. The at least four fixed piles are arranged in left and right columns relative to a water flow direction, and each column of the fixed piles is arranged along the water flow direction. The at least two force-bearing blocks are fixed to the corresponding fixed piles or supports and located on left and right sides of the horizontal axis hydro-generator below the water surface, respectively. Ends of the at least two force-bearing supports are respectively mounted on the left and right sides of the horizontal axis hydro-generator relative to the water flow direction and the other ends are respectively against the corresponding force-bearing blocks.

In a general aspect, a system stores energy underwater. In some aspects, the system includes a base having a bottom side resting on an underwater floor and a top side that includes recessed surfaces. The system also includes domed walls extending from the top side of the base to form respective fluid chambers. Each of the fluid chambers includes an interior volume that is at least partially defined by one of the recessed surfaces and an interior surface of one of the domed walls. The system additionally includes a pump and a generator. The pump is configured to transport water from the fluid chambers toward an exterior environment of the system. The generator is configured to generate electrical energy in response to water flowing from the exterior environment toward the fluid chambers.

A method and system are disclosed which provides for power generation from oceanic wave motion which utilize: a double concave sided buoy flotation device, a recoil mechanism, an alternating-to-direct motion converter with gears having gravitational unidirectional collapsible teeth thereon and an underwater ramp to direct waves toward the buoy.

A method of controlling energy conversion and/or applied wave loads for a membrane power conversion wave energy converter (WEC) having a longitudinal axis and at least one cell having a membrane. The method includes acquiring data and determining a value relating to a local sea state at the WEC or to a WEC state of the WEC. Depending on the value determined from the acquired data, one or both of the vertical position of the at least one WEC cell relative to a free surface at still water and/or the angle of incidence of the WEC is adjusted.

A sealing system for use in an offshore wind turbine includes two interconnected tubular members, and a flexible sealing member. The flexible sealing member includes, seen in cross section: an annular attachment part; an annular strip shaped sealing part which is connected to said attachment part by means of an annular hinge portion of said sealing part, and which sealing part extends away from said attachment part in a direction which has a first component in a direction which is parallel to the axis of the annular attachment part; and an annular strip shaped actuator part extending from said hinge portion of said sealing part in a direction which has a component in the radial direction.

An energy storage system includes a vessel for storing water, an energy conversion device, and a connection line connecting the vessel with the energy conversion device. The energy conversion device includes first and second housings, a pump turbine in the first housing, and a motor generator in the second housing. The pump turbine includes a first shaft and an impeller mounted on the first shaft. The motor generator includes a second shaft and a rotor at the second shaft for rotating relative to a stator. The second shaft is coupled to the first shaft for transmitting torque between the first and second shafts. The connecting line connects a low pressure opening with an opening for receiving water or discharging water. The second housing is filled with a gas for a barrier pressure during operation of the energy conversion device, such that the rotor rotates within the gas.

The present invention provides an adaptive hydroelectric turbine system comprising a base for a hydroelectric turbine or other electrical component, the base having four ground contacting feet, at least one of which is displaceable relative to the remaining of the base such as to ensure that all four feet can contact the seabed to provide improved stability and load bearing capabilities.

A buoyant energy generating housing apparatus submersed in fluid currents. The disclosed embodiments comprises rotary turbines that harvest the kinetic energy in the currents, and buoys that house equipment and provide buoyancy to support the system. Movements and rotations are restrained by multiple cables or tendons that are anchored on the seabed, in combination with the internal active ballast system in the buoys. Applications in currents with direction change are possible with the use of two-buoy embodiments, further assisted by the optional use of weathervanes.

A tidal current energy generating device includes an outer frame (1), at least two inner frames (2), at least two mounting shafts (4), a driving unit (6), at least four horizontal-axis hydraulic generators (3), and at least six bearings (5). The at least two inner frames (2) are separably disposed in the outer frame (1), respectively. The at least two mounting shafts (4) are rotatablely disposed in the two inner frames (2), respectively, and the axial direction of the at least two mounting shafts (4) is perpendicular to the horizontal plane. The driving unit (6) is connected with the at least two mounting shafts (4) to drive the mounting shafts (4) to rotate. Every two horizontal-axis hydraulic generators (3) are fixed at one mounting shaft (4) and are disposed in the same inner frame (2). The at least four horizontal-axis hydraulic generators (3) change directions with the rotating of the mounting shaft (4). Every three bearings (3) are sleeved on one mounting shaft (4), and the three bearings (5) on one mounting shaft (4) are disposed on the two sides and the center of the two horizontal-axis hydraulic generators (3), respectively. The tidal current energy generating device can be maintained or replaced conveniently and can extend deeply in the sea.