The application relates to unidirectional hydrokinetic turbines having an improved flow acceleration system that uses asymmetrical hydrofoil shapes on some or all of the key components of the turbine. These components that may be hydrofoil shaped include, e.g., the rotor blades (34), the center hub (36), the rotor blade shroud (38), the accelerator shroud (20), annular diffuser(s) (40), the wildlife and debris excluder (10, 18) and the tail rudder (60). The fabrication method designs various components to cooperate in optimizing the extraction of energy, while other components reduce or eliminate turbulence that could negatively affect other component(s).

A stator of a permanent magnet direct-drive wind power generator includes a stator support, a stator iron core, a blade side tooth pressing plate and a blade side surrounding plate. At least one comb tooth air inlet hole is provided on a side close to the rotor of the blade side surrounding plate, the comb tooth air inlet hole and the second air hole are connected respectively via an air guide pipe. A first spiral comb tooth mechanism is provided on a side, close to the rotor sealing ring, of the blade side surrounding plate, the first spiral comb tooth mechanism is in communication with the comb tooth air inlet hole. The first spiral comb tooth mechanism has first spiral comb teeth protruding into an annular gap formed by the blade side surrounding plate and the rotor sealing ring for generating an airflow with spiral motion.

A generator device for generating an induced electrical power from the movement of a fluid stream. The generator device can include a circumferential casing that houses a stator, a power storage system and a power management system that receives the induced electrical power, and a propeller-rotor assembly located in the central opening of the casing and rotatably coupled to the casing. The propeller-rotor assembly has two or more propeller blades with distal ends opposite the axis of the propeller-rotor assembly to which magnets are attached. The device can also have a tether assembly for anchoring the generator device in a moving fluid stream and positioning the generator device so that the movement of fluid stream through the generator device causes the propeller-rotor assembly to rotate and, thereby, through interaction with the stator, to generate the induced electrical power. The generator device can be portable and easily deployed by a single user.

A fluid power-generating system operatively disposed between a first support and a second support, the system characterized by an absence of a centrally disposed rotor member, and including a machine capable of acting as a motor and as a generator, the machine coupled to the first support; a flexible wing(s) having an arcuate shape, a distal end coupled to the machine and a proximal end coupled to the second support, for catching and passing a flowing fluid; a tensioned balancing system coupled to the supports for stabilizing operation of the power-generating system; and a rigid strut(s) disposed between each flexible wing and the balancing system for supporting each flexible wing.

A wind power plant comprises a platform having a deck and a frame. The frame comprises a plurality of generator stations, each configured for receiving and supporting a respective removable wind turbine generator. Generator conveyance means are configured and arranged for moving a wind turbine generator between the deck and a generator station. The wind turbine generator comprises a housing in which a turbine is rotatably arranged. The turbine comprising a plurality of blades interconnected by a peripheral rim; and the rim comprises a plurality of magnets. The housing comprises a plurality of coils arranged in close proximity to the peripheral rim. The platform may be a floating platform, supported by at least a main hull, connectable to a seabed via turret mooring, whereby the power plant is allowed to weathervane.

A permanent-magnet direct-drive wind power generator, a system and a stator thereof are provided. The stator includes a stator support, a stator iron core arranged around an outer peripheral wall of the stator support and a blade side tooth pressing plate arranged on an axial end face at a blade side of the stator iron core. At least one first air hole is provided in the outer peripheral wall of the stator support, and at least one second air hole is provided in the blade side tooth pressing plate, and further includes at least one air flow passage via which the first air hole and the second air hole are in communication with each other, and the air flow passage passes through the interior of the stator iron core. The stator can introduce air flow inside the stator support to an axial end face of the stator iron core.

Provided is a method for controlling a wind turbine, in particular an electric generator of said wind turbine. The method includes an optimization during which a suitable operating parameter for controlling said wind turbine or generator thereof is determined, in particular in an iterative manner. The optimization includes providing a multidimensional space comprising a plurality of parameters; providing an objective function for said multidimensional space, e.g., a simplex has a shape of a triangle or a tetrahedron; and determining one parameter of said multidimensional space as a suitable operating parameter by applying said objective function to said multidimensional space, in particular in an iterative manner. The method includes selecting a suitable operating parameter as an operating parameter for said wind turbine or generator thereof; and operating said wind turbine or generator based on said operating parameter, in particular by controlling a converter connected to said generator.

A drive system for driving a piece of equipment includes a pendulum mechanism. The pendulum mechanism has a bob member, a connector member, and a pivot member, wherein the bob member is connected to the pivot member by the connector member in a manner that allows the bob member to swing about the pivot member. An equipment connecting mechanism is adapted to operatively connect the drive system to a piece of equipment so that the piece of equipment can be driven by the drive system. The bob member comprises a carriage that has a platform that supports a mass transfer mechanism, the mass transfer mechanism including a translating mass and a linear actuator adapted to translate the translating mass relative to the platform. Selective translation of the translating mass causes the bob member to swing in a pendulum motion or maintain a pendulum motion.

When it is not possible for a power generation device to operate coupled to an electric power system, an autonomous operation of connection and disconnection of a load of the power generation device is performed along an efficiency-characteristics curve within a speed range from a rated speed to a maximum speed in the efficiency-characteristics curve of an energy source. During the autonomous operation, an aperture command is outputted to an inlet valve of a water turbine and a first converter is operated in a converter mode when an operation preparation command is outputted by a control unit, a second converter is operated in an inverter mode when a voltage is established by of a DC linkage unit, and the load is connected when the operation preparation is completed.

A float apparatus for harnessing the kinetic energy of waves. The float apparatus includes a float having a central vertical tunnel. An elongated housing is disposed within the tunnel, the housing has a closed top and an open bottom. A wire coil is disposed within the housing. A bar magnet is received within the housing and the wire coil, wherein the movement of the bar magnet relative to the wire coil within the housing results in generation of current in the wire coils. A ballast that submerges in water is suspended from the float body by multiple elastic cords. A shaft extends between the bar magnet and the ballast. The movement of the float body relative to the ballast by waves causes the magnet to move relative to the wire coils generating electricity.