A linear, universal modular absorber for wave energy conversion having a linear module incorporating two subassemblies: an actuated subassembly and a reference subassembly. The linear module contains a direct drive linear machine for converting linear mechanical motion into electrical energy. The linear module may be used between any two oscillating mechanical bodies, exploiting their relative motion, and adapting to the mechanical characteristics of the larger system in which it is deployed.

A marine plant assembly comprising a floating vessel and a plant operating unit attached to a buoyancy vessel in such a way that the operating unit is at least partially submerged during operation. At least one link element provides a hinged connection between the operating unit and the buoyancy vessel, thereby to allow movement of the operating unit from its submerged operating position to above the water level and adjacent the buoyancy vessel by said link element rotating into a position substantially parallel to the buoyancy vessel.

This disclosure is directed to hydrodynamic electric generators, including their structural design, methods of deployment, anchoring systems, drive systems and control systems. The system can be scaled from ones that can be hand carried to large, stationary devices that can generate up to and greater than 20 kw in a current of 3 knots. In a stationary system, the device can be anchored to an underwater floor by an anchoring device supported by four adjustable legs. These legs can eliminate the need for extensive mooring lines, providing the device with a small footprint that is non-hazardous to marine animals or vegetation. Individual components, such as rotors, generators and other mechanical components can be modularly installed for easy removal and servicing without having to disturb the entire system.

A WEC module for connection to a WEC system having a power take-off (PTO) configured to generate electricity in response to fluid flow in a fluid flow path of the system. The module includes a mounting portion for releasably mounting the module to the system, a deformable sealing member configured to provide a sealed fluid connection between the module and the fluid flow path, and a working surface configured to exchange, in response to wave motion, a working fluid with the fluid flow path via the sealed fluid connection. Also disclosed is a WEC system and a method of deploying the WEC module. Also disclosed is an installation device for a working surface and a method of installing a working surface.

The present invention relates to an inlet for a hydrodynamic screw, the inlet comprising—a first end connectable to a hydrodynamic screw, the first end having a first opening—a second end for transporting water through the inlet towards the first end, the second end having a second opening, —an inlet body connecting the first end and the second end, the inlet body comprising a hollow that extends through the inlet body and connects the first opening and the second opening, wherein the inlet has a first diameter at the first opening and a second diameter at the second opening, the second diameter being larger than the first diameter, and wherein the nlet further comprises a ridge arranged on an inner surface of the hollow in a helix, the ridge having a height that increases towards the first end. The invention also relates to a hydrodynamic screw.

The device for conversion of wave energy into electrical energy consists of a supporting structure, the first working body, an anchor and anchor cables. The supporting structure is connected to the anchors by anchor cables, while the first working body is slidably connected to the supporting structure. The motion transformation system is firmly connected to the supporting structure and comprises rigid gears toothed with gears with rolls on one side while on the other side they are hinged to the first working body, on the other side of the gears with the rolls, rigid gears are connected at one end, while their other end is hinged to other working body. The gears with rolls are connected by shafts with a multiplier that drives the generator that further produces electricity. The device constructed in this way has the possibility of transport to the place of exploitation, because it floats stably on its own. The anchor system is transported to the place of exploitation using a transport body that also has the ability to float on its own and to submerge.

A system includes a float including a drivetrain, a reaction structure coupled to the drivetrain by a tendon, and an extension spring having a first end coupled to a fixed point on the tendon and a second end configured to be disposed at a fixed location relative to the drivetrain. The extension spring is configured to experience an elastic force in response to tension on the first end of the extension spring away from the drivetrain.

Systems and method for a hydrokinetic energy device. A hydrokinetic energy device includes a main body including two main wing-shaped spars mounted upon a rotating central hub, and rotatable spar tip turbines mounted at or near an end of each of the main wing-shaped spars, the main wing-shaped spars driving the rotatable spar tip turbines through water, each of the rotatable spar tip turbines including a direct-drive generator and power conversion system that transfers power from a rotating rotatable spar tip turbine to the central hub where the voltage is stepped up and amperage is reduced.

A hydrokinetic electric generator system for use in water that includes a first generator located inside a submersible first housing with fore and aft sections with respective fore and aft attachment points, a center of mass of the first generator located between the fore and aft attachment points, the first generator having a shaft extending out the aft section of the first housing with a turbine attached to the shaft, a flotation support structured to float on the water, and a first cable having a first end attached to the flotation support and a second end attached to the first attachment point on the fore section, and a second cable having a first end attached to the flotation support and a second end attached to the second attachment point in a manner to permit the system to change position in response to changes in direction of water current.

A system includes a float including a drivetrain, a reaction structure coupled to the drivetrain by a tendon, and an extension spring having a first end coupled to a fixed point on the tendon and a second end configured to be disposed at a fixed location relative to the drivetrain. The extension spring is configured to experience an elastic force in response to tension on the first end of the extension spring away from the drivetrain.