Abstract: The invention relates to a method for controlling a wind turbine as virtual synchronous machine by determining the synchronous machine rotational speed rotational speed and the synchronous machine angle. The virtual synchronous machine rotational speed is determined based on a combination of a feedback of a damping power, a power reference for a desired power output of the wind turbine, a grid power supplied by the wind turbine to a power grid and a chopper power dissipated by the chopper and an inertial integration model, the synchronous machine angle is determined based on an integration of the synchronous machine rotational speed, and the damping power is determined based on the virtual synchronous machine rotational speed.

Abstract: Devices, systems, and methods to air-cool a portable generator are disclosed. The devices include various air ducts to direct airflow over heated components within a cabinet of the portable generator to cool the components by convection. A damping fan draws ambient temperature air into the cabinet and directs the air into channels of an outflow duct.

Abstract: A method for providing a requested real power including receiving the requested real power at a transmission feed-in point; using a real power band with an upper band limit and a lower band limit, each of which is disposed with an offset from the requested real power. The real power band furthermore comprises at least one control threshold value between the upper band limit and the lower band limit. The method includes controlling at least one regenerative energy generator depending on the at least one control threshold value, in particular in order to provide the requested real power as transmission power at the transmission feed-in point.

Abstract: A method for operating a wind power installation for the purpose of generating electrical power from wind, wherein the wind power installation has an aerodynamic rotor having rotor blades that can be adjusted in their blade angle, and the rotor is operated at a settable rated rotor speed, wherein a turbulence class at a site of the wind power installation is determined, and the rated rotor speed is defined in dependence on the determined turbulence class.

Abstract: A run-of-the-river hydroelectric generating plant is disclosed, in which river water is diverted downstream, used in the hydroelectric generation process, and sent back to the river. A high-mass, large diameter hydro rotor for hydroelectric power generation is disclosed. A large diameter circular horizontal water flow, the desired water flow regime, is created to float and rotate the high-mass hydro rotor, which is coupled to a turbine shaft. Extremely high torque and angular momentum is provided for conversion into extremely high energy output. The desired water flow regime can be augmented with different configurations of penstocks, intake channels, and discharge channels.

Abstract: A wave energy capture system deployed in water converts mechanical motion induced by waves in the water to electrical energy. A controller of the wave energy capture system receives input regarding real-time wave conditions in a vicinity of the wave energy capture system. The controller applies a control model to the received input to select a value of a control parameter for the wave energy capture system, where the control model includes a model that has been trained using machine learning to take wave condition data as input and to output control parameter values selected based on the wave condition data in order to increase an amount of energy captured by the wave energy capture system. The controller implements the selected value of the control parameter on the wave energy capture system.

Abstract: Systems methods and apparatuses for conversion of kinetic energy, which may include: a sail element; a mast; piston device(s) each comprising a piston housing and a piston; movable element(s) connectable to an edge of each piston; and a transmission subsystem movably connectable to the mast and to the movable element(s). The moveable element(s) and piston(s) are movable along a slopped linear path. Clockwise and/or counterclockwise rotations of the mast, caused by wind, are translatable into linear movements of the moveable element(s) and the piston(s), in a first linear trajectory, where the weight of the moveable element(s) causes opposite linear movement of the moveable element(s) and piston(s) in a second opposite linear trajectory, which causes reciprocal movements of the piston(s) causing fluid pressure by emptying and filling of a fluid therefrom and thereto. The mechanical apparatus can connect to a power generation subsystem, configured for conversion of fluid pressure into electrical power.

Abstract: An offshore wind turbine erected in a body of water includes a generator, a foundation, a nacelle, a tower having a first end mounted to the foundation and a second end supporting the nacelle, an electrolytic unit arranged above a water level and electrically powered by the generator to produce hydrogen from an input fluid, in particular water, and a fluid supply assembly for supplying the input fluid from a fluid inlet arranged below the water level to the electrolytic unit by means of a fluid connection, wherein the fluid supply assembly includes a cleaning unit configured to clean a build-up formed along an area extending through the inner part of at least a part of the fluid connection or formed at the fluid inlet.

Abstract: A control apparatus is configured to control driving of a power generation apparatus including a motor and a power generator. The control apparatus includes a processor configured to calculate: (i) a first adjustment force command value for controlling the motor in accordance with a deviation between an observed value and a reference value of a rotation speed of the power generator; (ii) a correction value for compensating for a delay of an electric output of the power generator; and (iii) a second adjustment force command value for controlling the motor by adding the first adjustment force command value and the correction value.

Abstract: Disclosed herein is a hydropower electric generator, in accordance with some embodiments. Accordingly, the hydropower electric generator may include a closed conduit. Further, the closed conduit may include a reservoir, two downward flow pipes, two horizontal pipes, and two upward flow pipes. Further, the downward flow pipes may include turbines configured to intercept the downward flow of the water and generate rotational force. Further, the upward flow pipe may include an airlift assembly configured to receive compressed air into the upward flow pipe. Further, the hydropower electric generator may include an air pump configured to generate the compressed air based on electrical energy. Further, the hydropower electric generator may include an energy storage device.

Abstract: The disclosure is directed to an apparatus or a system for generating energy in response to a vehicle wheel rotation. The apparatus or the system may include a roller configured to be positioned in substantial physical contact within a groove of a wheel of the vehicle. The roller may be configured to rotate in response to a rotation of the wheel. The apparatus or the system may further include a flexible arm rotatably couplable to the roller such that rotation of the roller causes the flexible arm to rotate. The flexible arm may be configured to exert a downward force on the roller to increase the friction between the roller and the groove of the wheel. The apparatus or the system may further include a first generator operably coupled to the flexible arm and configured to generate an electrical output based on the rotation of the flexible arm shaft and convey the electrical output to an energy storage device or vehicle motor.

Abstract: A power generator is disclosed that generates power using the buoyancy of air rising in water. A plurality of air bags are connected to a chain which in turn is connected to a system of gears. An air compressor inflates air bags as they are rotating up to the surface of the water around the chain. The buoyancy of the air bags causes the chain to rotate the gear system which transforms rotational energy into electrical energy by a generator. The air bags are deflated before re-entering the water, and are then re-inflated upon rotating up towards the surface again.

Abstract: A wind turbine comprising: a tower; a first arm extending from the tower; a first rotor-nacelle assembly disposed on the first arm; a first movement sensor disposed on the first arm or on the first rotor-nacelle assembly and arranged to generate first movement data based on movement of the first arm or of the first rotor-nacelle assembly; a second arm extending from the tower; a second rotor-nacelle assembly disposed on the second arm; a second movement sensor disposed on the second arm or on the second rotor-nacelle assembly and arranged to generate second movement data based on movement of the second arm or of the second rotor-nacelle assembly; and a control system coupled to the first and the second movement sensors and arranged to receive and to process the first and second movement data; wherein the control system is arranged to determine an oscillation characteristic of the wind turbine from the first and the second movement data.

Abstract: Systems, methods, and non-transitory computer readable media including instructions for coordinating MPPT operations for a cluster of geographically-associated fluid turbines are disclosed. Coordinating MPPT operations for a cluster of geographically-associated fluid turbines includes receiving data from the cluster of geographically-associated fluid turbines; determining changes to total power output of the cluster based on changes in loading states of individual fluid turbines in the cluster; selecting a combination of loading states for the individual fluid turbines in the cluster to coordinate total power output for the cluster; and transmitting the selected combination of loading states to at least some of the individual fluid turbines in the cluster in order to vary rotational speeds of the at least some of the individual fluid turbines in the cluster.

Abstract: Disclosed is an apparatus that adapts the rate of its computational work to match the availability of energy harvested from a stochastic energy source; and, with respect to some types of energy harvesting, regulates the rate of energy capture, the rate of energy conversion, and the rate of consumption of stored potential energy, through its alteration, regulation, and/or adjustment, of that same computational work load.

Abstract: A power system includes a base, two magnetic bearings mounted on the base, a shaft rotatably mounted on the two magnetic bearings, a flywheel mounted on the shaft, a motor connected with the flywheel, an uninterrupted power supply electrically connected with the motor, a utility power electrically connected with the uninterrupted power supply, a coupling connected with the shaft, a speed change device connected with the coupling, a generating device connected with the speed change device, a load electrically connected with the generating device, a recharge rectifier electrically connected with the uninterrupted power supply, and a reactor electrically connected with the recharge rectifier and the generating device. Thus, the enlarged torque of the flywheel provides the inertia power to enhance the generating power of the generating device.

Abstract: An apparatus that floats at the surface of a body of water over which waves pass, causing a nominally vertical axis of the apparatus to tilt away from an axis normal to the resting surface of the body of water. Tilting allows a fluid to flow through a channel that in an un-tilted apparatus would require the gravitational potential energy of the fluid to increase (i.e., to flow uphill), but, because of the tilt allows the fluid to flow through the channel in a downhill direction. Successive wave-driven tilts of the apparatus incrementally raise water to a head from which a portion of its gravitational potential energy can be converted to electrical power by causing the water to return to a lower level by flowing through a water turbine, or through some other apparatus that performs a useful function when supplied with a flow of high-pressure water.

Abstract: A wind turbine control apparatus, method and non-transitory computer-readable medium are disclosed. The wind turbine control apparatus comprises a generator connected to a wind turbine with a drive train. The drive train comprises a rotor, a low speed shaft, a gear box, a high speed shaft, and a controller module. The controller module is configured to obtain a maximum power within a large range of varying wind velocities by operating the rotor at a neural network determined optimal angular speed for the current wind velocity.

Abstract: An aero wind power generation apparatus includes: a drone unit including drone wings configured to make the aero wind power generation apparatus move and hover and a sensor unit configured to detect information for controlling the aero wind power generation apparatus; a buoyancy generation unit connected to the drone unit and including a side cover configured to open or close and a balloon provided inside the side cover, wherein the buoyancy generation unit is configured to enable injection of gas into or release of the gas from the balloon; and a power generation unit connected to the buoyancy generation unit and including a rotating unit with a plurality of blades, a blade control unit of adjusting the state of the blades, and a motor unit of converting kinetic energy transferred from the rotating unit into electrical energy.

Abstract: A DC power plant generating DC power from a variety of engines including a Stirling cycle engine. The DC power plant includes a relatively small start-up power source that is discontinued after the engine is running. A method for producing DC power for a load including starting up an engine using power supplied by a relatively small power supply supplemented by a capacitor bank, providing output from the engine to a generator, producing alternating current (AC) power by the generator, converting the AC power to direct current (DC) power, disabling output of the DC power during a first set of pre-selected conditions, limiting a rate of change of current of the DC power during a second set of pre-selected conditions, reducing conducted and radiated emissions of the DC power, disconnecting the DC power from the load under a third set of pre-selected conditions, and providing the DC power to the load.