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7633770 |
Collection and transmission system
A collection and transmission system includes: a system direct current (DC) link configured for carrying power from a source to a grid; and alternating current (AC) to DC power converter modules...
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7564703 |
Method and apparatus for synchronized parallel operation of PWM inverters with limited circulating current
An apparatus and method for converting DC voltage across positive and negative DC buses to three phase AC voltages on first, second and third AC output lines, the method comprising the steps of...
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7561451 |
Power converter apparatus and methods using a phase reference derived from a DC bus voltage
In a power converter apparatus, such as an uninterruptible power supply, a phase reference signal is generated responsive to a DC voltage on a DC bus. A magnitude reference signal may be generated...
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7558087 |
Multilevel AC/DC converter for traction applications
A power supply system for railway traction applications including a multilevel AC/DC converter. The converter comprises a plurality of series-connected single-stage cycloconverters or direct AC...
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7518891 |
Auxiliary circuit for use with three-phase drive with current source inverter powering a single-phase load
An auxiliary circuit for reducing low order current harmonics in a three-phase drive system driving a single-phase load, the three-phase drive system including a three-phase source voltage...
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7471525 |
Converter and power converter that becomes it with the converter
A converter includes a converter circuit 1 having a plurality of bridge-connected semiconductor switching devices for converting AC power into DC power, a smoothing condenser connected in...
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7439714 |
Method for operation of a converter system
The present invention relates to a method for operating a converter system of a wind turbine, wherein the converter system includes converter modules capable of converting electric power produced...
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7416337 |
Bag
A bag, for e.g. collecting garbage or freezing foods, includes a thin, flexible material, e.g. plastic foil formed with an opening, which in its flat-laid state is bounded by two facing edges. A...
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7414870 |
Inverter
An inverter includes an intermediate circuit, inverter bridge branches downstream of the intermediate circuit for outputting a power signal, and a controller operable for individually turning on...
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7336052 |
Device for powering a variable speed drive
Variable speed drive comprising a main rectifier module ( 10 ) including thyristors (K 1 , K 2 , K 3 ) to power a main continuous bus ( 15 ) from an external power network ( 5 ), an inverter module...
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7321500 |
Electric power converter
A voltage source converter for high power application containing a plurality of valves, each valve containing a plurality of extinguishable semiconducting elements, and a valve control unit...
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7305291 |
Mobile energy management system
A recreational vehicle includes a chassis having a living space, an electrical system for providing electrical power to the living space, an air conditioner for cooling the living space, a heater...
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7304835 |
Mainframe and power supply arrangement
A mainframe and power supply arrangement is disclosed to include a mainframe, which has a base frame holding a DC power jack and connector modules, a circuit module, which includes a sliding...
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7301248 |
Control method for voltage boosting circuit
A control method for a voltage boosting circuit adapted to be used in an uninterruptible power supply is proposed. The uninterruptible power supply includes a battery module and a voltage boosting...
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7274579 |
Converter circuit and motor driving apparatus
A converter circuit for converting an output voltage from an AC power supply includes a rectifier circuit for rectifying the output voltage of the AC power supply; first and second capacitors...
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7274576 |
Power converter with reduced common mode voltage
An improved power converter that produces reduced-levels of common-mode voltages, or even entirely eliminates such voltages, is disclosed herein, along with a method of reducing common-mode...
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7227331 |
Safety interlock and protection circuit for permanent magnet motor drive
A circuit for protecting against controller failure wherein the controller provides control signals for controlling a DC to AC inverter fed by a DC bus and driving a permanent magnet motor, the...
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7190597 |
Control of an inverter pulse-width modulator
A modulation method for a pulse width modulator in the inverter section ( 11 ) of a frequency converter provided with a voltage intermediate circuit, said frequency converter comprising a...
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7173832 |
Multifunction power convertor
The present invention relates to a multifunction power convertor in the field of power transmission. The multifunction power convertor consists of a rectifier circuit, a filter circuit connecting...
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6931554 |
Add-on card for wireless communication with power-managing circuit
An add-on card for a personal digital assistant (PDA) for wireless communication includes a connector for connecting to the PDA, a power managing circuit connected to the connector for storing a...
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6839249 |
AC-to-ac power converter without a dc link capacitor
An ac-to-ac power converter includes a source-side inverter that is operated in current mode and a drive side inverter that is operated in commutation mode. The source side inverter performs...
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6762947 |
Control method and apparatus to reduce current through DC capacitor linking two static converters
A control method and apparatus to reduce current through a DC capacitor linking two converters causes the value of the DC-side current output of the first converter to approach the value of the...
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6703719 |
Systems and methods for managing a battery source associated with a microturbine power generating system
A microturbine power generating system and associated method for managing a battery source associated with a microturbine power generating system is disclosed. The system and methods enable...
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6594130 |
Method and circuit for the protection of a thyristor
Circuits and methods for protecting thyristors in a bridge configuration are provided. A circuit comprises a line reactor in series with the input of the bridge and the input of the diametric cell,...
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6583995 |
Permanent magnet generator and generator control
A system includes a permanent magnet generator, a dc link, an inverter coupled between the generator and the dc link, and a control for the inverter. The control regulates dc link voltage by...
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6570384 |
Location of a cable in a dc connection in a bipolar 12-pulse system for transmission of electrical energy by means of high-voltage direct current
A dc connection (CAB 1 , CAB 2 ) in a bipolar 12-pulse system for transmission of electrical energy by means of high-voltage direct current interconnects two converters, each one having two 6-pulse...
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6531843 |
Driving system of AC motor
The present invention provides a control algorithm which instantaneously detects magnetic pole positions in the inside of a motor including polarities of the motor. A controller 1 applies a...
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6487096 |
Power controller
A power controller provides a distributed generation power networking system in which bi-directional power converters are used with a common DC bus for permitting compatibility between various...
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6473319 |
Plant for transmitting electric power and a method for changing the direction of power transmission in such a plant
A plant for transmitting electric power with a direct voltage network and at least two stations connected thereto with line commutated valves ( 15, 16 ) with bidirectionally controlled thyristors...
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6411527 |
High-voltage DC/DC converter
A high-voltage DC/DC converter is described. The high-voltage DC/DC converter contains a number of primary-side converter modules and at least one secondary-side converter module. The DC...
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6411067 |
Voltage source converters operating either as back-to-back stations or as parallel static var compensators
A device and a method for controlling the flow of electric power in a transmission line carrying alternating current, in which a first voltage source converter is connected to the transmission line...
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6411529 |
Control for power plant
A plant for transmitting electric power which employs a first combination of a turn off semiconductor and controllable semiconductor connected in antiparallel and a second combination of a turn off...
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6400585 |
Method and control system for voltage control at a converter station
A converter station (STN 1, STN 2 ) having a voltage source converter (CON 1, CON 2 ) is coupled between a direct current link (W 1, W 2 ) and an alternating current network (N 1, N 2 ) in a...
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6335871 |
Motor operation controller and insulation type bidirectional DC voltage converter
A motor operation controller, which can accommodate different power supply voltages by changing a minimum circuit configuration using common motors, wiring, etc., has an insulation structure...
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6275392 |
Method and apparatus for pre-charge control of VSI
A method and apparatus for automatically selecting and employing different DC link pre-charge levels dependent upon different sources providing power to a power conditioning system wherein the...
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6269010 |
CSI based drive having feedforward control of inverter input voltage
The drive for an a.c. induction motor features a rectifier for converting alternating current into direct current and a current source inverter for converting direct current into alternating...
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6246595 |
Series control of electric ARC furnaces
A circuit and method for regulating power supplied on a network which provides power to an electric arc furnace or other highly variable load. The circuit includes at least a first inverter...
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6208098 |
Variable frequency drive noise attenuation circuit
A noise attenuation circuit is disclosed for use in a motor drive system. The motor drive system includes a pulse width modulated inverter providing three phase power output on three phase...
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6198641 |
Plant for transmitting electric power including bidirectionally controlled thyristors (BCT)
In a plant for transmitting electric power between two stations (17, 18) through a direct voltage network (16) for High Voltage Direct Current an arrangement (23) is arranged for draining electric...
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6185116 |
HVDC power transmission system with cooling and switching device temperature detection
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6141226 |
HVDC transmission system with bidirectionally controlled thyristors
A plant for transmitting electric power having a direct voltage network (18) for High Voltage Direct Current and at least one pole conductor interconnecting two stations (21, 22). In each station...
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6115269 |
Control equipment for active filters and a method for reduction of harmonics in a bipolar dc link
A bipolar converter station for conversion between alternating current and high-voltage direct current comprises a first and a second active filter (AF11, AF12), each with its own piece of control...
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6067238 |
Method for reconstruction of a plant for transmitting electric power as well as such a plant
An HVDC-plant with two stations with line commutated valves having tyristors, as rectifying semiconductor components for transmitting electric power between a direct voltage network and alternating...
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6055163 |
Communications processor remote host and multiple unit control devices and methods for micropower generation systems
A communications processor is disclosed for a power generation system that permits data and control signals to be communicated to and from the power generation system and a host computer. The...
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5969956 |
Method and a device for communication in a high voltage converter station
An apparatus and method for communication between low potential level and a valve of a high voltage converter station located on high voltage potential level is provided. The apparatus comprises...
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5917718 |
Method and apparatus for eliminating overmodulation in a power plant
A method and apparatus for eliminating overmodulation in a power plant is provided. The power plant has a direct voltage network connected to at least one alternating voltage network through a...
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5910888 |
Plant for transmitting electric power
A plant for transmitting electric power between at least two alternating voltage networks which are each connected through a station to a direct voltage network for high voltage direct current. The...
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5901053 |
Plant for transmitting electric power to remote facilities which have an electric motor load
A plant for transmitting electric power comprises a direct voltage network for High Voltage Direct Current (HVDC) and at least one alternating voltage network connected thereto through a first...
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5870293 |
System for signalling power unbalance between electric power stations
A system for transmitting electric power between a direct voltage network and alternating voltage networks through VSC-converters. A first station which transmits electric power is in voltage...
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5867375 |
System for regulating the active power transferred into and out of direct voltage network by multiple power stations
A system for transmitting power over a direct voltage network. A first power station connects one alternating voltage network to the direct voltage network. The first power station includes a...
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