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7501798 |
Method for the active damping of the drive train in a wind energy plant
A method for the active damping of a drive train in wind energy plant, with the following steps: the actual value of the generator rotational speed is acquired and amplified via an oscillatory...
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7215099 |
Method in frequency converter provided with voltage intermediate circuit, and frequency converter
A method in a frequency converter provided with a voltage intermediate circuit in connection with interference in a network ( 5 ) to be supplied and a frequency converter ( 2 ), which comprises a...
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7211989 |
Method for acceleration of a shaft run, as well as an apparatus for carrying out the method
A method for acceleration of a shaft run that a turbine, in particular a gas turbine, a generator and an excitation machine connected to one another by a common shaft, includes accelerating the...
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7170262 |
Variable frequency power system and method of use
A variable frequency power system with a power source having a rotating output and a speed control to regulate rotational speed of the rotating output. A generator coupled to and driven by the...
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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...
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7061211 |
Gas turbine generating apparatus
A gas turbine generating apparatus according to the present invention comprises a gas turbine capable of a high-speed operation, a permanent-magnet-type generator driven at a high speed by the gas...
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7030593 |
Multiple path variable speed constant frequency device having automatic power path selection capability
The present invention relates to variable speed constant frequency (VSCF) devices and methods for maximizing engine generator efficiency. In one embodiment, a VSCF device may include at least two...
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6992465 |
Generator control circuit having alarm controller
A generator control circuit of an ac generator which charges a battery includes a voltage regulator, a comparator which provides a control signal for controlling the voltage regulator when the...
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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...
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6888263 |
Gas turbine generator
A gas turbine generating apparatus according to the present invention comprises a gas turbine capable of a high-speed operation, a permanent-magnet-type generator driven at a high speed by the gas...
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6882060 |
Turbine generating apparatus
A turbine generating apparatus includes a control unit which controls the turbine generating apparatus as follows. During a system connection running mode, a fuel is fed to the gas turbine at a...
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6781331 |
Method and apparatus for regulating motor generator output
A method and system of regulating an output voltage of a boiling water reactor nuclear reactor plant recirculation system motor generator are provided. The method includes sensing an alternator...
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6700105 |
Induction heating system and method for internal combustion engine
A compact induction heating system that is at least partially powered by a source of substantially clean DC current. The induction heating system includes a high frequency inverter with an input...
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6696675 |
Induction heating system for internal combustion engine
A compact induction heating system for use on an internal combustion engine driven implement having an engine driven alternator to generate DC current for storage in a battery used as a source of...
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6628103 |
Power factor control apparatus and method
A power factor control apparatus comprises a target power factor setting section which sets a target power factor range of the plurality of power generators in a fixed cycle, a comparing section...
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6628005 |
Single speed turbine generator for different power system output frequencies in power generation systems and associated methods
A power generation system ( 10 ) and associated methods to compensate for different power system output frequencies are provided. The system ( 10 ) preferably includes a turbine ( 12 ) having a...
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6624617 |
Apparatus and method for stabilizing the voltage of an AC generator with variable rotor speed
The method for stabilizing the voltage of an AC generator with varying (alternating) rotor speed is characterized in that the voltage generated by an AC generator is maintained constant when the...
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6603289 |
Vehicle alternator control device and method
A vehicle alternator control device has a power transistor, a flywheel diode, a voltage control circuit, a primary power supply circuit, and a secondary power supply circuit. When the alternator...
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6479971 |
Method for regulating a three-phase machine without a mechanical rotary transducer
A method is provided for regulating a three-phase machine functioning under any operational conditions without a mechanical rotary transducer. The machine is supplied with D.C. power by an...
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6392371 |
Universal frequency electrical generator
A power generator in which the rotor's mechanical rotation speed and the output frequency can be varied substantially independently of each other through electronic controls, to achieve results...
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6380734 |
Control element assembly position verification apparatus
A position verification apparatus comprising a movable member disposed within and movable with respect to a housing containing the movable member, a means for generating a magnetic field within the...
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6323625 |
Turbine/alternator on a common shaft with an associated electrical system
An electrical system for a turbine/alternator comprising a gas driven turbine and permanent magnet alternator rotor rotating on a common shaft and comprising an inverter circuit connected either to...
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6323624 |
Procedure to connect an asynchronous generator on an alternating current and an electrical connecting for use at this procedure
The invention relates to a procedure of connecting a polyphased asynchronous generator on a polyphased alternating voltage network. The connecting is carried out by means of an adjustable,...
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6163137 |
Rotary induction machine having control of secondary winding impedance
A rotary induction machine in which operating characteristics of the machine are controlled by adding impedance elements to the rotor windings in which the impedance elements are stationary and...
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6163078 |
Adjustable speed gas turbine power generation apparatus and its operation method
An adjustable speed gas turbine power generation apparatus can maintain a rated output of the gas turbine generation apparatus irrespective of ambient temperature change. For this purpose, the...
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6124702 |
Step switch cycloconverter utilizing multi-tap armature
Electrical machine cycloconverter devices are provided that produce output signals in which the frequency, amplitude and phase are independent of rotor speed. The cycloconverters produce highly...
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6118187 |
Method for controlling an output of an electrical power plant
A method for controlling a power plant which delivers electrical power to an electrical grid. The grid has a grid frequency which fluctuates around a nominal frequency. A power output of the power...
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6087753 |
High-efficiency inductor-alternator
An inductor-alternator provides highly efficient conversion between mechanical and electrical energy. The inductor-alternator produces increased output by providing armature coils in a single air...
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6072303 |
Method and apparatus for compensating a line synchronous generator
A line synchronous generator with an exciter and generator stage. The exciter stage includes an exciter stator and an exciter rotor, and the generator stage includes a generator stator and...
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6064186 |
Method for managing the excitation of an automobile alternator by means of a regulator
A system and method are provided to manage the excitation of an automobile alternator through the use of its regulator which delivers to the inductor of the alternator a pulse width modulation...
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5977645 |
Aircraft secondary power system
A secondary power system for an aircraft utilizes a variable frequency electrical distribution system that provides power to one or more loads that can tolerate distortion components. In addition,...
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5965949 |
Engine-driven generator
An engine-driven generator incorporating an engine and a generator into a single unit, with the output shaft of the engine coaxially connected to the rotating shaft of the generator, via a frame...
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5809047 |
Method for driving a wavelength changeable light source apparatus, such a wavelength changeable light source apparatus and an optical communication system using the same
A light source apparatus includes a light source, a mode selecting unit, a light source control unit and a mode selection control unit. An oscillation mode of the light source is switchable between...
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5798631 |
Performance optimization controller and control method for doubly-fed machines
A variable speed, constant frequency (VSCF) system utilizes a doubly-fed machine (DFM) to maximize the output power of the system. The system includes a power converter that provides a frequency...
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5777459 |
Induction electrical power generating system with variable numbers of poles and excitation frequency
The invention is an induction electrical power generation system for generating alternating current varying within a frequency range; the system includes an induction electrical generator (52) for...
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5773964 |
Output and torque control of an automotive alternator
An apparatus for controlling the output and torque of a synchronous alternator has a controlled bridge rectifier operable off synchronous for rectifying the alternating output and establishing a...
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5729118 |
Variable speed induction generator-motor with controllable excitation frequency
A variable velocity apparatus includes a wound-rotor induction machine having a primary winding connected to a power system having a power system frequency, a secondary winding excited by an...
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5698968 |
Power system stabilizer for generator
To improve the resistance against external low-frequency disturbance (represented by generator output change), the power system stabilizer for a generator, for inputting a voltage regulating signal...
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5627744 |
Converter enhanced variable frequency power bus architecture
An electric power generation and distribution system having a basic variable frequency distribution bus to which wide frequency variation tolerant utilization equipment is coupled and an enhanced...
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5581168 |
Starter/generator system with DC link current control
A synchronous generator usable in both a starting mode of operation and a generating mode of operation includes a permanent magnet generator having a permanent magnet and an armature winding...
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5550457 |
Electric power generating device for vehicles
An electric power generating device including an induction type electric rotating machine rotating in interlock with an engine comprises an inverter connected at the AC side to and end of an...
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5525894 |
Rotary induction generator adapted to be driven by a prime mover for generating electric power
A rotary induction generator having a stator with stator windings defining a three-phase stator and a rotor mounted for rotation therein, and having wound thereon three rotor windings defining a...
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5504417 |
Engine-driven generator
An engine-driven generator includes an internal combustion engine, a permanent magnet alternator and an AC to AC converter. The output frequency and voltage of the permanent magnet alternator are...
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5448167 |
Power system control apparatus for reducing power fluctuations
An improved power system control apparatus which reduces power fluctuations and includes an estimated unit for estimating the system impedance and phase difference angle using the generator power...
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5418446 |
Variable speed constant frequency synchronous electric power generating system and method of using same
A variable speed constant frequency synchronous electrical generating system includes a generator rotor with a polyphase field winding whereby the position of the electromagnetic field relative to...
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5406190 |
Device for generating electrical energy having an A.C. generator coupled to a turbine
A device for generating electrical energy includes at least one a.c. generator which is coupled to a turbine driven by a flowing medium and is connected via capacitive elements to a rectifier with...
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5300876 |
Power system stabilizer estimating a power system impedance
A power system control apparatus has a power system impedance estimating circuit for estimating a power system impedance from an internal power of a generator, determined by an internal current...
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5281905 |
Induction machine based hybrid aircraft engine starting/generating power system
This invention relates to a hybrid AC/DC power source for aircraft power generation and aircraft engine starting. The power source employs an induction motor/generator and a converter for...
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5237260 |
Engine-operated generator system
An engine-operated generator system utilizes the switching elements of an inverter transformation circuit to accomplish starting. The starter circuit includes a battery, one electrode of which is...
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5083077 |
Brushless doubly-fed generation system for vehicles
An onboard power generation system for use on board a vehicle, such as a passenger car, includes a brushless doubly-fed generator. The generator has a rotor with rotor conductors and a stator with...
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