A vibration suppression method and device of a wind power generator is provided. The method includes: calculating a specified value of a flux-weakening control parameter of the generator according to a preset value of an electromagnetic active power of the generator and a frequency of the generator; and controlling the generator according to the specified value of the flux-weakening control parameter of the generator. The method and device reduce the magnetic load of the generator by the flux-weakening control, thereby suppress vibration and noise of the generator.

A system that converts acceleration to rotational energy by using gravity to lower a ballast member and buoyancy to raise it when the ballast member is filled with compressed air. The ballast's initial ascent is controlled by a brake member. This ascent causes a rack assembly to rise that actuates a compressor to refill the intermediary tank with compressed air so the cycle can repeat itself. The initial phase begins with the ballast member containing compressed air so it can ascend up a liquid-filled silo, generating rotational energy along the way using a mounted cable that travels around a wire drum. Upon reaching the top of the silo, valves will open allowing water to enter the ballast thereby sinking it to the bottom, creating additional rotational energy.

A system that converts acceleration to rotational energy by using gravity to lower a ballast member and buoyancy to raise it when the ballast member is filled with compressed air. The ballast's initial ascent is controlled by a brake member. This ascent causes a rack assembly to rise that actuates a compressor to refill the intermediary tank with compressed air so the cycle can repeat itself. The initial phase begins with the ballast member containing compressed air so it can ascend up a liquid-filled silo, generating rotational energy along the way using a mounted cable that travels around a wire drum. Upon reaching the top of the silo, valves will open allowing water to enter the ballast thereby sinking it to the bottom, creating additional rotational energy.

An alternator comprising a primary portion and a secondary portion that are movable relative to each other: the primary portion comprises first and second series of magnets arranged to form an alternation of magnets from the first and second series of magnets; the secondary portion comprising a core and a coil surrounding said core. The secondary portion presents a first collector having teeth that are spaced apart in such a manner that during travel of the secondary portion relative to the primary portion in said travel direction, the alternator adopts in alternation first and second distinct configurations, the teeth of the first collector when in the first configuration facing magnets belonging to the first series of magnets, and the teeth, when in the second configuration, facing magnets belonging exclusively to the second series of magnets.

A wind turbine fault detection circuit is designed to determine presence of a fault. In a described embodiment, the wind turbine fault detection circuit utilizes a magnetometer in the form of a hall-effect sensor coupled between a power converter and a ground element to measure a ground current from the power converter to obtain a real ground current. The wind turbine fault detection circuit utilizes a comparator to determine presence of a fault based on the real ground current.

A nacelle for a wind turbine generator comprises a crane articulated on a base fixed to said nacelle. The crane includes a cantilevered telescopic boom, a principal winch with a lifting line and respective azimuth and elevation drive units for moving said boom in azimuth and in elevation relative to said nacelle. The crane has a deployed condition in which said boom is moveable in azimuth and in elevation and a stowed condition. The nacelle comprises a support structure against which said boom is brought to rest in said stowed condition thereof and wherein when in said stowed condition said boom is located into a predetermined position at which it is held to rest at a point along its length against said support structure and wherein said lifting line is in a reference position in relation to said nacelle when said crane is in its stowed condition. A method for operating a crane in a nacelle comprising operating said crane as a static hoist using a principal winch of said crane when in said stowed condition of said crane.

A wind turbine is provided. The wind turbine includes a DC-distribution network, connected or connectable at a DC connection node to receive DC power; and at least one variable drive system connected or connectable to the DC-distribution network. Methods for operating a wind turbine are also provided.

A self-powered hot water heater capable of heating water without external electricity is disclosed. The heater device includes an insulated, sealed housing, preferably cuboidal, with inlet and outlet ports for flow of water. A magnetic paddle wheel is disposed within the housing and rotates by water inflow. The wheel is equipped with outwardly extending paddles and a central magnetic core that generates a magnetic field. When the magnetic field is cut through by the paddles, voltage is induced in windings through electromagnetic induction. A copper tubing inside the housing is wrapped in resistance wire and is connected to the windings. The tubing uses the induced voltage to heat water as the water moves from the inlet port to the outlet port. The system also includes a voltage controller that converts AC to DC and features an automatic cut-off to prevent overheating.

The present invention is an underwater power generation system engineered for operation in a low-flow environment on a seafloor or riverbed. Features of the system include a hybrid Savonius C foil and Darrieus helical foil hydro-kinetic (HK) turbine for primary power generation and a microbial fuel cell (MFC) for secondary power generation. Both power generation sources are secured to a base frame and may be used to charge a rechargeable battery. Anodes from the MFC preferably rest in anoxic sediment on the seafloor or riverbed. The rechargeable battery may be used to power target electrical equipment that may include sensors, data-logging, communications and other electronic functionality operating underwater.

The present invention is an underwater power generation system engineered for operation in a low-flow environment on a seafloor or riverbed. Features of the system include a hybrid Savonius C foil and Darrieus helical foil hydro-kinetic (HK) turbine for primary power generation and a microbial fuel cell (MFC) for secondary power generation. Both power generation sources are secured to a base frame and may be used to charge a rechargeable battery. Anodes from the MFC preferably rest in anoxic sediment on the seafloor or riverbed. The rechargeable battery may be used to power target electrical equipment that may include sensors, data-logging, communications and other electronic functionality operating underwater.