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| Number | Title | Issue Date |
| 7888915 | System for detecting generator winding faults A system includes an induction generator controller configured to operate an induction generator via a converter. The induction generator controller includes a diagnostic mode configured to instruct the converter to send an input signal to a rotor of the induction g... | 02/15/2011 |
| 7667439 | Power converter arrangement and method A power converter arrangement for connecting an induction generator to an electric power network comprises a first path provided for transferring electric power from the induction generator to the electric power network during a first operation condition, and a seco... | 02/23/2010 |
| 7486053 | Power manager for an electrical power generator An electrical power generator includes a controller for making a full power capacity of the generator available for consumption by at least one intelligent load coupled to an output of the generator. The controller obtains data from which both a present output power... | 02/03/2009 |
| 7355367 | System and method for AC power generation from a reluctance machine A system and method is provided for generating AC power using a synchronous reluctance machine (12) or a salient-pole synchronous machine (102) and a power converter (110). The present invention can be used to achieve power production for a sync... | 04/08/2008 |
| 7341321 | Rotation detecting device and anti-skid braking system using the same A rotation detecting device that includes an electric power generator having a stator and a rotor, said rotor having a plurality of alternating opposite magnetic poles in a circumferential direction of the rotor, at least a first magnetic sensor mounted on either th... | 03/11/2008 |
| 7330016 | Induction generator power supply A method for enhancing the operation of an electrical power supply includes selecting a prime mover having a chosen power rating. An induction motor having a first power rating at a rated speed and a second power rating at an overspeed is chosen. The overspeed may b... | 02/12/2008 |
| 7309974 | System and method for AC power generation from a reluctance machine A system and method is provided for generating AC power using a synchronous reluctance machine (12) or a salient-pole synchronous machine (102) and a power converter (110). The present invention can be used to achieve power production for a sync... | 12/18/2007 |
| 7301310 | Excitation controlled synchronous permanent magnet machine The present invention provides an apparatus and methods for providing constant voltage from a permanent magnet generator at varying prime mover speeds or under varying loads. A constant voltage permanent magnet generator includes a housing, a magnetized rotor, a pri... | 11/27/2007 |
| 7276882 | Regulator control circuit and method Switching devices control the rectification and flow of alternating current power from a source such as an alternator to a load such as a battery in response to both the voltage of the battery and a minimum selected time period that is selected to eliminate or reduc... | 10/02/2007 |
| 7272514 | Protection system for an electrical power generator An electrical power generator is characterized by a plurality of system parameters. The generator includes a controller for protecting the generator. The controller obtains data from which a present operating point of the generator and a power generating capacity of... | 09/18/2007 |
| 7268443 | Wind turbine generator system A wind turbine generator system can regulate the rotational velocity of the wind turbine within an operation range even when the wind velocity suddenly changes and can perform continuous operation of the wind turbine. The wind turbine generator system includes a gen... | 09/11/2007 |
| 7239034 | Engine driven power inverter system with cogeneration A combined heat and AC power generating system is disclosed having black start capability for the full time, simultaneous production of both electricity and heat. Heat generated within the system is captured and used for heating applications such as heating building... | 07/03/2007 |
| 7215098 | Electrical generating system having capacitative control of alternator regulation The invention provides an electrical generating system comprising an AC electrical generator (G) having an output, and a capacitor arrangement (Ca) provided at the output of the generator and arranged so as to offset a drop of voltage from no-load to full-load occur... | 05/08/2007 |
| 7161257 | Active anti-islanding system and method An engine control system suited for use with an engine that outputs electrical power to a local load and is electrically connected to an electrical grid. The engine control system includes a set point control operable to set an engine power output value and a sensor... | 01/09/2007 |
| 7151359 | Variable reluctance generator A variable reluctance generator has phase windings and a bias winding. By controlling the excitation produced by the bias winding, the speed of the machine or the DC link, a power converter using only diodes can supply power to a DC bus. A method of operating a vari... | 12/19/2006 |
| 7142997 | Automatic power factor corrector A computer controlled solid-state switching power factor corrector, which senses the phase angle of each phase of the current as well as the voltage and automatically aligns the current phase angle to the voltage phase angle. This power factor correction is designed... | 11/28/2006 |
| 7129813 | Wound-rotor transformer and power source device using said wound-rotor transformer A small size wound rotor transformer having a simple structure, wherein the primary winding (32) is mounted on the central portion of a bobbin (insulator) (2), and the first and second secondary windings (39, 41) are mounted at both sides of the... | 10/31/2006 |
| 7122993 | Regulated voltage control override Apparatus and methods are provided for controlling a voltage output of an alternator having a regulated voltage control (RVC). The apparatus includes a processor configured to transmit one of at least two control signals and a switch coupled to the processor and con... | 10/17/2006 |
| 7095131 | Variable speed wind turbine generator A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls ... | 08/22/2006 |
| 7095192 | Rotating electric machine for automotive application An automotive generator/motor is driven by a battery via an inverter. Resistance 2Ra0 is expressed by 2Ra0=Vmax/√{square root over (3)} Iamax, where Vmax is a maximum voltage applicable across any two terminals from the inverter and Iamax is a maximum current whic... | 08/22/2006 |
| 7071581 | Uninterruptible power supply system using a slip-ring, wound-rotor-type induction machine and a method for flywheel energy storage Several embodiments of an uninterruptible power supply (UPS) system, which system provides highly reliable output power to a load using a slip-ring induction machine and a flywheel combination, are disclosed as well as methods relating thereto. In a preferred embodi... | 07/04/2006 |
| 7068015 | Wind power plant having magnetic field adjustment according to rotation speed A wind power plant where the driving shaft communicates with a synchronous generator (3) optionally through a gear (2) and with a transformer, if any, communicating through an AC/DC inverter 7 with an HVDC transmission cable 9. The synchr... | 06/27/2006 |
| 7053590 | Power generating system including a high-frequency alternator, a rectifier module, and an auxiliary power supply A power generating system includes a high-frequency alternator, a rectifier, a capacitor in each phase line extending between an output terminal of the alternator and the rectifier, and an auxiliary power supply, providing auxiliary power for use within the power ge... | 05/30/2006 |
| 7045913 | Microturbine engine system A microturbine engine that includes a compressor that is operable to provide a flow of compressed air. The compressed air flows through a recuperator where it is preheated before delivery to a combustor. The preheated compressed air mixes with a fuel and is combuste... | 05/16/2006 |
| 7042110 | Variable speed distributed drive train wind turbine system A variable speed wind turbine employing a rotor connected to a multiplicity of synchronous generators with wound field or permanent magnet rotors. A passive rectifier and an inverter are used for power transfer back to the grid. A Turbine Control Unit (TCU) commands... | 05/09/2006 |
| 7038330 | Protection for wind power station A wind power station comprises a wind rotor; a transmission mechanically coupled to the wind rotor; an asynchronous generator having a generator rotor mechanically coupled to the transmission, and a generator stator electrically coupled to a power grid; and a protec... | 05/02/2006 |
| 7015784 | Wound-rotor transformer and power source device using said wound-rotor transformer An object of the present invention is to materialize a small size wound-rotor transformer in a simple structure, wherein the primary winding 32 is mounted on the central portion of the bobbin (insulator) 2, and the first and second secondary windings | 03/21/2006 |
| 7005867 | Power supply circuit and testing device A power supply circuit is provided that supplies a voltage to a load. The power supply circuit includes a power supply for generating a predetermined voltage; an electrical path for electrically connecting the power supply and the load to each other; a current draw ... | 02/28/2006 |
| 6977487 | Vehicular alternator failure determination apparatus using commutating device voltage A vehicular alternator failure determination apparatus is capable of making a failure determination accurately. The apparatus includes a maximum voltage detection part (1) for detecting a maximum voltage of an alternator commutating device which commutates an... | 12/20/2005 |
| 6954046 | Method and apparatus to control input to AC induction motors One embodiment of the present invention is a method to control input to an alternating current (AC) induction motor from a power supply that includes steps of: (a) determining a measure of reactive power (VAR) in two input lines to the motor during a time period; an... | 10/11/2005 |
| 6943462 | Ring generator for a wind power installation A slowly rotating synchronous generator (ring generator) for a wind power installation, the generator having a rotor and a stator surrounding the rotor, and the stator having at least one three-phase current winding on which a capacitive current is impressed, and th... | 09/13/2005 |
| 6933704 | Slip-inducing rotation starting exciter for turbine generator A dynamoelectric machine combining the functions of an exciter, a turning motor, and a starting motor for a turbine. The machine operates in a first mode where the slip between a first stator winding and a first armature winding is positive and thus the magnetic fie... | 08/23/2005 |
| 6933705 | Generator stator voltage control through DC chopper A method and apparatus of stator voltage control for an induction generator. Each phase of the induction generator stator is connected through a secondary coil of a transformer to a utility grid. A stator voltage control circuit is connected in parallel with a prima... | 08/23/2005 |
| 6930471 | Hybrid synchronous/induction generator power plant A power generation plant comprising a power generating unit that includes at least one first generator, such as an induction generator, coupled to at least one synchronous generator having a rotor with a superconducting (SC) coil. The induction generator and the SC ... | 08/16/2005 |
| 6924627 | Method of reactive power regulation and aparatus for producing electrical energy in an electrical network A method of reactive power regulation in an electrical network in which electrical power is produced by an electrical generator preferably driven by the rotor of a wind power installation and suitably modulated by means of a compensation device between the generator... | 08/02/2005 |
| 6919650 | Hybrid synchronization phase angle generation method A hybrid use of a phase-locked-loop controller and a microprocessor-based controller to synchronize the phase angles of a three-phase AC power source, such as a static power converter, with those of a three-phase power grid. The phase-angle synchronization may enabl... | 07/19/2005 |
| 6815934 | Induction generator power supply An induction generator power supply comprises a prime mover, an induction generator operably connected to the prime mover and having a generator output, and a phase shift circuit, having a circuit input and a circuit output, the circuit input connected to the genera... | 11/09/2004 |
| 6788031 | Induction generator system and method An induction generator having one or more energy windings and one or more auxiliary windings where the auxiliary windings have fixed and switched capacitors which are used to control the induction generator output under variable load conditions. The auxiliary windin... | 09/07/2004 |
| 6707279 | Induction generator control with minimal sensor requirements A method of controlling an induction generator such as an automotive starter-alternator or a windmill is disclosed. The method comprises using a minimal number of current sensors and controlling at least one of a machine flux, an output voltage and generator torque,... | 03/16/2004 |
| 6486639 | Method of controlling a stand-alone electrical generator, in particular for aircraft The generator includes an asynchronous machine with a wound rotor driven mechanically and a stator connected to the network. The rotor is excited by a constant DC voltage source via an inverter controlled by a pulse width modulation control circuit. In ac... | 11/26/2002 |
