Patents by Inventor Konstantinos Papastergiou
Konstantinos Papastergiou has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9276407Abstract: A power system includes a power generating plant including a plurality of power generators, and an AC collection grid adapted to interconnect the power generating plant and an HVDC converter station. The AC collection grid is adapted to operate outside network regulations, whereby advantages such as simplified control and electronics are achieved. A method of operating a power system is also provided.Type: GrantFiled: June 5, 2012Date of Patent: March 1, 2016Assignee: ABB RESEARCH LTDInventors: Staffan Norrga, Antonis Marinopoulos, Konstantinos Papastergiou, Panagiotis Bakas
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Patent number: 9065328Abstract: It is presented a power converter for converting power between a first high voltage direct current, DC, connection, a second high voltage DC connection and a high voltage alternating current, AC, connection. The power converter comprises: a first phase arrangement comprising a first converter arm, a second converter arm, a third converter arm, a fourth converter arm, a fifth converter arm and a sixth converter arm. The first, second third and fourth converter arms are serially connected in the mentioned order between two terminals of the first high voltage DC connection. The high voltage AC connection is connected between the second converter arm and the third converter arm.Type: GrantFiled: November 16, 2011Date of Patent: June 23, 2015Assignee: ABB TECHNOLOGY AGInventors: Konstantinos Papastergiou, Georgios Stamatiou
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Patent number: 9041257Abstract: A system for distributing electric power to an electrical grid. The system includes a DC/AC inverter arranged to convert a DC voltage output from an electric power generator to an AC voltage, a transformer arranged to receive the AC voltage, transform the AC voltage and deliver the transformed AC voltage to the grid, and a connector arranged to selectively connect and disconnect the transformer from the grid. The DC/AC inverter is arranged to control primary winding magnetizing current delivered to the transformer. Further, the connector is arranged to selectively connect and disconnect the grid to and from the transformer on the basis of the controlled magnetizing current.Type: GrantFiled: November 8, 2013Date of Patent: May 26, 2015Assignee: ABB RESEARCH LTD.Inventors: Konstantinos Papastergiou, Zhiguo Pan
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Publication number: 20150115721Abstract: A power system includes a power generating plant including a plurality of power generators, and an AC collection grid adapted to interconnect the power generating plant and an HVDC converter station. The AC collection grid is adapted to operate outside network regulations, whereby advantages such as simplified control and electronics are achieved. A method of operating a power system is also provided.Type: ApplicationFiled: June 5, 2012Publication date: April 30, 2015Applicant: ABB RESEARCH LTDInventors: Staffan Norrga, Antonis Marinopoulos, Konstantinos Papastergiou, Panagiotis Bakas
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Patent number: 9019732Abstract: It is presented a high voltage DC/DC converter for converting between a first DC connection and a second DC connection. The high voltage DC/DC converter comprises: a first set of DC terminals; a second set of DC terminals); a multiphase transformer device comprising a plurality of primary windings and a corresponding plurality of secondary windings; a first converter arranged to convert DC to AC, comprising a plurality of phase legs serially connected between the first set of DC terminals, wherein each phase leg is connected to an AC connection of a respective primary winding; and a second converter arranged to convert AC from the secondary windings to DC on the second set of DC terminals.Type: GrantFiled: July 4, 2011Date of Patent: April 28, 2015Assignee: ABB Technology AGInventors: Staffan Norrga, Konstantinos Papastergiou, Sasitharan Subramanian, Tomas Jonsson
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Publication number: 20140375122Abstract: It is presented a power converter for converting power between a first high voltage direct current, DC, connection, a second high voltage DC connection and a high voltage alternating current, AC, connection. The power converter comprises: a first phase arrangement comprising a first converter arm, a second converter arm, a third converter arm, a fourth converter arm, a fifth converter arm and a sixth converter arm. The first, second third and fourth converter arms are serially connected in the mentioned order between two terminals of the first high voltage DC connection. The high voltage AC connection is connected between the second converter arm and the third converter arm.Type: ApplicationFiled: November 16, 2011Publication date: December 25, 2014Applicant: ABB TECHNOLOGY AGInventors: Konstantinos Papastergiou, Georgios Stamatiou
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Publication number: 20140140104Abstract: It is presented a high voltage DC/DC converter for converting between a first DC connection and a second DC connection. The high voltage DC/DC converter comprises: a first set of DC terminals; a second set of DC terminals); a multiphase transformer device comprising a plurality of primary windings and a corresponding plurality of secondary windings; a first converter arranged to convert DC to AC, comprising a plurality of phase legs serially connected between the first set of DC terminals, wherein each phase leg is connected to an AC connection of a respective primary winding; and a second converter arranged to convert AC from the secondary windings to DC on the second set of DC terminals.Type: ApplicationFiled: July 4, 2011Publication date: May 22, 2014Applicant: ABB TECHNOLOGY AGInventors: Staffan Norrga, Konstantinos Papastergiou, Sasitharan Subramanian, Tomas Jonsson
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Publication number: 20140062221Abstract: A system for distributing electric power to an electrical grid. The system includes a DC/AC inverter arranged to convert a DC voltage output from an electric power generator to an AC voltage, a transformer arranged to receive the AC voltage, transform the AC voltage and deliver the transformed AC voltage to the grid, and a connector arranged to selectively connect and disconnect the transformer from the grid. The DC/AC inverter is arranged to control primary winding magnetizing current delivered to the transformer. Further, the connector is arranged to selectively connect and disconnect the grid to and from the transformer on the basis of the controlled magnetizing current.Type: ApplicationFiled: November 8, 2013Publication date: March 6, 2014Inventors: Konstantinos Papastergiou, Zhiguo Pan
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Patent number: 8643323Abstract: A photovoltaic system for generating an output voltage that is uninfluenced by varying irradiation, includes a photovoltaic source having an input terminal and an output terminal. The photovoltaic system includes a voltage adding arrangement having a first input terminal and an output terminal. The voltage adding arrangement is connected in series with the photovoltaic source, and includes a first route having a voltage source and a second route as a voltage source bypass. The first and second routes extend between the first input terminal and the output terminal of the voltage adding arrangement. The first and second routes being alternately activateable.Type: GrantFiled: June 17, 2011Date of Patent: February 4, 2014Assignee: ABB Research LtdInventors: Panagiotis Bakas, Georgios Demetriades, Frans Dijkhuizen, Staffan Norrga, Konstantinos Papastergiou, Bengt Stridh, Stefan Thorburn, Lennart Ängquist
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Patent number: 8633614Abstract: Storage device for a high voltage electrical power including at least two modules connected in series, each module including at least one dc power-source in a container with positive and negative terminals. The device including positive and negative poles, first and second conductors arranged to form a current path between the poles, the first conductor including a plurality of conductor parts connected to the terminals of the modules to provide a series connection, a first module of the series being connected to one of the poles, and the second conductor is connected between a last module in the series and the other pole, wherein the conductors are arranged to pass through the containers in parallel such that a current flows through the first conductor in a first direction and through the second conductor in an opposite second direction.Type: GrantFiled: November 22, 2010Date of Patent: January 21, 2014Assignee: ABB Research Ltd.Inventors: Tomas Larsson, Fredrik Tinglöw, Georgios Demetriades, Willy Hermansson, Konstantinos Papastergiou
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Patent number: 8629648Abstract: Exemplary embodiments of the disclosure relates to a photovoltaic system for generating an output voltage which is uninfluenced by varying irradiation. The photovoltaic system includes at least one photovoltaic unit having two photovoltaic sources, wherein each photovoltaic source includes an input terminal and an output terminal. The photovoltaic unit includes two voltage adding arrangements, each voltage adding arrangement having a first route including a voltage source and a second route including a voltage source bypass. The first voltage adding arrangement is connected in series with the first photovoltaic source and the second voltage adding arrangement is connected in series with the second photovoltaic source. A switch is arranged between an input terminal of the first photovoltaic source and an output terminal of the second photovoltaic source.Type: GrantFiled: June 17, 2011Date of Patent: January 14, 2014Assignee: ABB Research LtdInventor: Konstantinos Papastergiou
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Patent number: 8525366Abstract: A dc power source for a high voltage power apparatus, the dc power source including one or more strings including a plurality of dc power source units connected in series, and switches configured to connect and disconnect said strings. The switches are solid-state switches distributed among the power source units of each string, and all solid-state switches in the string are arranged so that they are turned on and off simultaneously. Each switch is connected in parallel with a first controllable semiconductor in a first direction and connected in parallel with a second controllable semiconductor in a second direction which is opposite to the first direction, and the dc power source includes a control unit configured to bypass a failed switch by triggering the forward biased of the first or second controllable semiconductor connected to the failed switch in case a fault in the switch is detected.Type: GrantFiled: June 8, 2012Date of Patent: September 3, 2013Assignee: ABB Research Ltd.Inventors: Konstantinos Papastergiou, Willy Hermansson, Georgios Demetriades
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Publication number: 20130009591Abstract: An electric plant with a capacity to charge electric batteries is a plant for transmitting electric power including a Voltage Source Converter, an alternating voltage network connecting an alternating voltage side of the converter and a direct voltage part connected to the direct voltage side of the converter. The converter has a series connection of switching cells having each at least one energy storing capacitor. Electric batteries may be connected in parallel with the capacitor, and the charging state thereof may be influenced by controlling the switching cells of the Voltage Source Converter through a control arrangement.Type: ApplicationFiled: August 23, 2012Publication date: January 10, 2013Inventors: Georgios Demetriades, Konstantinos Papastergiou, Ambra Sannino
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Publication number: 20120242153Abstract: A dc power source for a high voltage power apparatus, the dc power source including one or more strings including a plurality of dc power source units connected in series, and switches configured to connect and disconnect said strings. The switches are solid-state switches distributed among the power source units of each string, and all solid-state switches in the string are arranged so that they are turned on and off simultaneously. Each switch is connected in parallel with a first controllable semiconductor in a first direction and connected in parallel with a second controllable semiconductor in a second direction which is opposite to the first direction, and the dc power source includes a control unit configured to bypass a failed switch by triggering the forward biased of the first or second controllable semiconductor connected to the failed switch in case a fault in the switch is detected.Type: ApplicationFiled: June 8, 2012Publication date: September 27, 2012Inventors: Konstantinos Papastergiou, Willy Hermansson, Georgios Demetriades
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Publication number: 20120025751Abstract: A photovoltaic system for generating an output voltage that is uninfluenced by varying irradiation, includes a photovoltaic source having an input terminal and an output terminal. The photovoltaic system includes a voltage adding arrangement having a first input terminal and an output terminal. The voltage adding arrangement is connected in series with the photovoltaic source, and includes a first route having a voltage source and a second route as a voltage source bypass. The first and second routes extend between the first input terminal and the output terminal of the voltage adding arrangement. The first and second routes being alternately activateable.Type: ApplicationFiled: June 17, 2011Publication date: February 2, 2012Applicant: ABB RESEARCH LTDInventors: Panagiotis BAKAS, Georgios Demetriades, Frans Dijkhuizen, Staffan Norrga, Konstantinos Papastergiou, Bengt Stridh, Stefan Thorburn, Lennart Ängquist
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Publication number: 20110278929Abstract: Exemplary embodiments of the disclosure relates to a photovoltaic system for generating an output voltage which is uninfluenced by varying irradiation. The photovoltaic system includes at least one photovoltaic unit having two photovoltaic sources, wherein each photovoltaic source includes an input terminal and an output terminal. The photovoltaic unit includes two voltage adding arrangements, each voltage adding arrangement having a first route including a voltage source and a second route including a voltage source bypass. The first voltage adding arrangement is connected in series with the first photovoltaic source and the second voltage adding arrangement is connected in series with the second photovoltaic source. A switch is arranged between an input terminal of the first photovoltaic source and an output terminal of the second photovoltaic source.Type: ApplicationFiled: June 17, 2011Publication date: November 17, 2011Applicant: ABB RESEARCH LTDInventor: Konstantinos PAPASTERGIOU
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Publication number: 20110159349Abstract: Storage device for a high voltage electrical power including at least two modules connected in series, each module including at least one dc power-source in a container with positive and negative terminals. The device including positive and negative poles, first and second conductors arranged to form a current path between the poles, the first conductor including a plurality of conductor parts connected to the terminals of the modules to provide a series connection, a first module of the series being connected to one of the poles, and the second conductor is connected between a last module in the series and the other pole, wherein the conductors are arranged to pass through the containers in parallel such that a current flows through the first conductor in a first direction and through the second conductor in an opposite second direction.Type: ApplicationFiled: November 22, 2010Publication date: June 30, 2011Inventors: Tomas Larsson, Fredrik Tinglöw, Georgios Demetriades, Willy Hermansson, Konstantinos Papastergiou