Patent application number | Description | Published |
20090295225 | MODULAR HVDC CONVERTER - A modular HVDC converter system including a high voltage direct current network, and at least two DC/AC converters being connected in series to the HVDC network. Each of the DC/AC converters is arranged to provide AC to a separate AC load. | 12-03-2009 |
20090301747 | Ground Electrode - A land electrode for a high voltage direct current transmission system including a converter station with a grounding point. The land electrode is connected to the grounding point and includes a plurality of electrode sections. Each electrode section includes at least one electrode element. | 12-10-2009 |
20100091527 | TAPPING POWER FROM A HVDC TRANSMISSION SYSTEM - An apparatus for tapping electric energy from an HVDC power transmission system includes at least one voltage source converter. The apparatus includes an intermediate ac network containing the voltage source converter, and a switching arrangement for disconnecting the intermediate ac network in dependence on the transmission direction of the HVDC power transmission system. | 04-15-2010 |
20100133915 | THYRISTOR CONTROLLIED SERIES CAPACITOR ADAPTED TO DAMP SUB SYNCHRONOUS RESONANCES - An apparatus for controlling a thyristor controlled series capacitor connected to a power transmission line. A thyristor firing control includes a unit for effectuating a desired capacitor voltage zero crossing in dependence of a line current and a capacitor voltage in response to a command signal. A command control provides the command signal to the thyristor firing control. The command control includes a damping control including a damper configured to damp at a least one discrete frequency. | 06-03-2010 |
20100230125 | LAND ELECTRODE - A return path between a first HVDC station and a second HVDC station. A first electrode is connected to the first station and a second electrode is connected to the second station. The return path includes a first part including a first low resistive zone through the crust of the earth in which the first electrode is embedded. A second part includes the earth mantle. A third part includes a second low resistive zone through the crust of the earth in which the second electrode is embedded. | 09-16-2010 |
20100232190 | CONVERSION OF AC LINES TO HVDC LINES - An electric power transmission system includes at each end of a high voltage direct current transmission line including three conductors, a converter station for conversion of an alternating voltage into a direct voltage for transmitting direct current between the stations in all three conductors. Each station has a voltage source converter and an extra phase leg connected between the two pole conductors of the direct voltage side of the converter. A third of the conductors is connected to a midpoint between current valves of the extra phase leg. An arrangement is adapted to control the current valves of the extra phase leg to switch for connecting the third conductor either to the first pole conductor or the second pole conductor for utilizing the third conductor for conducting current between the stations. | 09-16-2010 |
20100309698 | VOLTAGE SOURCE CONVERTER FOR HIGH VOLTAGE DIRECT CURRENT POWER TRANSMISSION - A high voltage AC/DC or DC/AC power conversion system including a voltage source converter with at least two series-connected converter valve bridges, at least two reactors, where each of the reactors is connected to one of the AC phase terminals of the at least two bridges and at least one transformer connected to an AC supply voltage. In order to block a DC voltage from the at least one transformer, one of at least two capacitors is connected in series with each of the at least two reactors and is connected between the corresponding reactor and the at least one transformer. | 12-09-2010 |
20110025447 | HIGH VOLTAGE DRY-TYPE REACTOR FOR A VOLTAGE SOURCE CONVERTER - A high voltage dry-type reactor is series-connected via a first terminal to an AC supply voltage and via a second terminal to the AC phase terminal of a high voltage converter and includes a cylindrical coil of insulated wire. In order to protect the reactor from a damaging DC field, the reactor further includes a metallic or resistive electrostatic shield which is connected to a same DC potential as the converter. | 02-03-2011 |
20110069517 | ARRANGEMENT FOR VOLTAGE CONVERSION - An arrangement for converting direct voltage into alternating voltage and conversely has a Voltage Source Converter with at least one phase leg connected to opposite poles ( | 03-24-2011 |
20110103115 | VOLTAGE SOURCE CONVERTER - A Voltage Source Converter having at least one phase leg connected to opposite poles of a direct voltage side of the converter and comprising a series connection of switching cells has inductance means comprising a plurality of inductors ( | 05-05-2011 |