Abstract: A power system includes a bus, a first controller and one or more second controllers. The first controller is configured to excite a first generator to generate electric power on the bus in response to initiation of rotation of the first generator. The one or more second controllers are configured to excite one or more respective second generators with a constant excitation in response to initiation of rotation of the first generator. The second generator(s) are electrically coupled with the bus and configured to operate as a motor to commence synchronous rotation with the first generator in response to electric power being present on the bus. The second controller(s) are further configured to initiate dynamic adjustment of the excitation of the second generator(s) to generate electric power on the bus with the second generator(s) in response to the first generator and the second generator(s) synchronously reaching a predetermined rotational speed.

Abstract: A method of operation of a turbogenerator system is described. The system comprises a plurality of turbogenerators provided in parallel and in fluid communication with a gas stream. The method comprises identifying one or more of the turbogenerators which are currently operating closest to their maximum power output, and adjusting the speed of one or more of the turbogenerators to cause the power outputs of the plurality of turbogenerators to become more similar. In this way, it is possible to match the power output of the plurality of turbogenerators.

Abstract: An apparatus and a method for managing the energy supplied to a low-voltage system of a vehicle. The low-voltage system includes a battery, which supplies the first voltage on a low-voltage bus. A system for charging the battery includes an alternator for supplying a charging voltage to the battery, and motor-vehicle loads supplied by the battery and/or by the alternator. A high-voltage system operates at a second voltage higher than said first voltage. The high-voltage system includes the vehicle energy-recovery stage. The second voltage is supplied through an intermediate energy-storage system and a DC-DC converter. A control module that carries out energy-management operations at least by the alternator. The second voltage of the DC-DC converter is regulated via a control procedure of a hysteretic type.

Abstract: An apparatus includes a controlled field alternator or utility source of electrical power, a segmented waveform converter, and a controller. The source of electrical power is configured to generate a polyphase signal. The synchronous inverter includes multiple switches connected between the polyphase signal of the source of electrical power and an output filter. The controller is configured to provide a control signal for the switches based on measured electrical quantities associated with the output filter and may provide a field control signal to the controlled field alternator. The apparatus may be applied to a vehicle, a lawnmower, a zero turn radius lawnmower, or another type of machine.

Abstract: The invention relates to a method for feeding electrical power into an electrical supply network by means of at least a first and a second wind farm. A first electrical wind farm output is provided by the first wind farm to be fed into the electrical supply network and a second electrical wind farm output is provided by the second wind farm to be fed into the electrical supply network, and a total power output is generated from at least the first and second wind farm output and fed into the electrical supply network, wherein a central control unit for controlling the total power output that is fed in controls the provision of at least the first and second wind farm output.

Abstract: A sole for footwear capable of recovering part of the energy produced during deambulation including: at least one energy harvesting means, including: a tubular body, fixed in use, having a first and a second end and a movable part slidable in the tubular body; the energy harvesting means being provided, in use, for generating electrical energy following the sliding of the movable part with respect to the tubular body that is fixed in use, during the deambulation; at least one actuator group for the energy harvesting means, including at least one fluid-dynamic circuit including: at least one first and one second tank including a fluid, the first tank being housed at a rear area of the sole and the second tank being housed at a front area of the sole; at least one first and one second joining conduit in fluid connection between the first tank and the first end of the at least one tubular body, and the second tank and the second end of the tubular body, respectively, where, the first tank has a configuration in

Abstract: A rotor portion of a synchronous machine includes a rotor. The rotor carries a field winding and a re-chargeable power storage device. The re-chargeable power storage device is electrically connected to the field winding to provide electrical power to the field winding while in generate or motor mode, and to provide electrical power to the re-chargeable power storage device while in a charge mode.

Abstract: A wind turbine pitch drive system comprises an electric grid for supplying electrical power, a motor for driving a pitch actuator, an electronic converter for controlling the motor and a back-up energy storage unit for supplying electrical power. The electronic converter comprises a DC-link capacitor bank. The system furthermore comprises a switching device for selectively connecting the DC-capacitor bank link to the back-up energy storage unit, and a frequency generator for controlling the switching device. Also disclosed is a method for protecting a component of the electronic converter.

Abstract: An exemplary system may include a gas turbine engine configured to operate at an engine power level to satisfy an engine power demand. The system may also include at least one generator operatively coupled to the engine and configured to generate electrical power based at least in part on the engine power demand. The system further may include at least one heating element in communication with the at least one generator, and at least one control unit coupled to the at least one heating element. The at least one heating element may be configured to receive electrical power from the at least one generator to generate thermal energy. The at least one control unit may be configured to energize the heating element when the engine power demand is below the engine power level and/or there is an anticipated increase in the engine power demand.

Abstract: The present invention relates to the field of generator technology. It is an object of the invention to control the stability in an electric grid in which a plurality of generators are connected providing electric power to the grid. A static exciter system includes a control device for controlling the field voltage of the field winding of at least two generators connected to a grid system via a busbar.

Abstract: A wind power turbine configured to produce and feed electric energy to an electric power grid; the wind power turbine having: a blade assembly; at least one electric machine connected to the blade assembly to generate electric energy, and having a rotor, and a stator divided into a quantity or number of stator subsystems; and an electric transmission system configured to connect the quantity or number of stator subsystems to the electric power grid, and having an electric transmission assembly for, and connected to, each stator subsystem. The wind power turbine being characterized by having a control device connected to, and configured to receive malfunction signals from, the electric transmission assemblies, and configured to define an individual target torque reference value on the basis of the malfunction signals from the electric transmission assemblies, so as to reduce discontinuity in the torque of the rotor.

Abstract: The present subject matter is directed to a system and method for operating a wind turbine. The method includes measuring, via one or more temperature sensors, a local temperature of a component of the wind turbine for a predetermined time period. The method also includes determining a power capability of the wind turbine as a function of the local temperature. Another step includes measuring, via one or more sensors, a power output of the wind turbine for the predetermined time period. A further step includes determining a power margin of the wind turbine as a function of the power capability and the measured power output and controlling the power output of the wind turbine based, at least in part, on the power margin.

Abstract: A method for directly converting wind energy into electrical energy is provided. An air stream is ionized and then routed through the electrical field of a collection electrode providing an opposing field for the air ions. The ions are collected on a collection electrode. The electrical potential of the collection electrode is higher than the ionizer, and discharged. A counter-electrode in front of the collection electrode has an electrical potential higher than the collection electrode. Ionized air molecules overcome the electrical field emanating from the counter-electrode via wind power. An apparatus for carrying out the method is provided. An optional retaining electrode, located in front of the ionizer electrode, drives ionized air in the counter-electrode and collection electrode direction. The apparatus is expediently located in a flow channel, with inlet and outlet electrodes at respective ends. A plurality of flow channels combine to form a flow generation module.

Abstract: The invention provides an apparatus configured to convert kinetic energy of wind flow into electric energy. The apparatus includes a mast, a primary electric generator mounted on the mast, a secondary electric generator mounted on the mast in a tandem arrangement with the primary electric generator, blades affixed to a rotor shaft of the primary electric generator, a driving clutch affixed to the rotor shaft of the primary electric generator, a driven clutch affixed to a rotor shaft of the secondary electric generator, and endless elongated member connecting the driving clutch with the driven clutch. The apparatus is configured to convert a kinetic energy of a wind flow into an electric energy at one or both of the primary and secondary electric generators.

Abstract: A fluid-cooled wind turbine has at least one electric machine, in turn having a stator with a stator supporting structure and a plurality of active stator sectors supported by the stator supporting structure, and a rotor which rotates about an axis of rotation and has a rotor supporting structure and a plurality of active rotor sectors supported by the rotor supporting structure; and a cooling system having a cooling circuit extending partly along a plurality of through channels adjacent to at least the active rotor sectors or the active stator sectors.

Abstract: A system, in one embodiment, may include a static starter subsystem having detection logic for indicating a conductive state of a solid state semiconductor device. The detection logic includes a first logic gate having a first input that receives a first input signal indicating a state of the static starter subsystem, a second input that receives a second input signal indicating a state of a gate firing command being applied to the solid state semiconductor device, and a third input that receives a third input signal indicating whether the solid state semiconductor device is conducting. The first logic gate may be configured to evaluate the first, second, and third input signals and provide a first output signal indicating conductivity of the solid state semiconductor device in response to the gate firing command.

Abstract: An electrical generator apparatus, which is configured to convert an external actuation force applied by a vehicle traveling on a roadway into electrical energy, includes a rotatable top portion adapted to receive the external actuation force applied by the vehicle traveling on the roadway; a plurality of linkage members operatively connected to one another in succession, the rotatable top portion being operatively coupled to a first one of the plurality of linkage members; a first wheel operatively coupled to a last one of the plurality of linkage members; a second wheel operatively coupled to the first wheel via a tangential coupling element; a rotatable shaft operatively coupled to the second wheel; at least one flywheel operatively coupled to the rotatable shaft; and at least one electrical generator operatively coupled to the rotatable shaft, the electrical generator adapted to convert a rotational movement of the rotatable shaft into electrical energy.

Abstract: A system and method for monitoring the rotation of a generator rotor. The monitor uses a light beam directed toward the rotor to detect a marking thereon, and generates an electrical pulse when the marking is detected. The time between the pulse and a reference point (such as a zero crossing) of the signal waveform from the terminals of the generator may be used to calculate the power angle of the generator. The system is adaptive in that it can account for new markings on the rotor. The system may be connected to a network so that power angles from various generators on the electrical network may be compared. The system may further be connected to a common time source such that a time stamp may be applied to the power angles from various generators, allowing for more accurate comparison of the power angles.

Abstract: An apparatus includes a vehicular electric power generation system comprising a variable speed internal combustion engine, a first variable speed electric power generator driven by the engine, a second variable speed electric power generator driven by the engine, a first inverter to receive electric power from the first generator a provide a first controlled electric output, a second inverter to receive electric power from the second generator and provide a second controlled electric output, and a controller coupled to the engine. The controller is responsive to variation in electrical loading of the first inverter and the second inverter and a degree of electrical load imbalance between the first inverter and second inverter to provide one or more engine control signals. The engine is responsive to the one more engine control signals to change rotational operating speed to adjust for the variation in electrical loading and the degree of electrical load imbalance.

Abstract: An electromechanical generator comprising an electromechanical device for converting mechanical vibrational energy into electrical energy, the electromechanical device being a velocity damped resonator having a damping coefficient and a resonant frequency, a power detector for detecting the output electrical power from the electromechanical device, a controller, and a damping coefficient adjuster for adjusting the damping coefficient of the electromechanical device, the controller being arranged to control the damping coefficient adjuster in response to the output electrical power detected by the power detector.