Patents by Inventor Lennart Angquist
Lennart Angquist 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: 11295912Abstract: An arrangement for interrupting current comprises a first and a second terminal. First, second, and third parallel circuit branches are arranged between the terminals to electrically connect two power networks. The first parallel circuit branch comprises a mechanical main circuit breaker, the second parallel circuit branch comprises an energy absorbing device, and the third parallel circuit branch comprises a resonant circuit and a voltage control means arranged in series. The voltage control means is controllable to inject energy into the resonant circuit to force a rapid increase of alternating current, wherein the alternating current flows in a loop containing the first and the third parallel circuit branches as the mechanical main circuit breaker is controlled to open to interrupt main current. Zero cross-over of the current through the mechanical main circuit breaker is thereby realized as the alternating current amplitude exceeds the main current amplitude.Type: GrantFiled: December 30, 2016Date of Patent: April 5, 2022Assignee: SCIBREAK ABInventors: Lennart Ängquist, Staffan Norrga
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Patent number: 11289295Abstract: A circuit breaker comprises a switch and an actuator comprising a displaceable shaft mechanically connected to a movable contact in the switch. A Thomson coil is adapted to displace the shaft in a first direction, and a disconnecting device is connected in series with the switch and that is adapted to open during an interval when current is extinguished. An energy storage is provided being a separate part from the shaft and being adapted to store energy when the shaft moves in the first direction and to release energy to displace the shaft in a second direction, comprising a mass-spring arrangement with a body, a first spring between the shaft and one end portion of the body at a side facing the shaft and a second spring at a first end portion connected to a side of the body facing from the shaft and at second end portion being fixed. The movement of the body continues undisturbed to achieve a time interval wherein a current is extinguished.Type: GrantFiled: July 13, 2018Date of Patent: March 29, 2022Assignee: SCIBREAK ABInventors: Lennart Ängquist, Staffan Norrga, Antoine Baudoin
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Patent number: 10903642Abstract: An arrangement for interrupting current comprising a first and a second terminal adapted to electrically connect two sections of a power system is provided. A voltage control means is controllable in use to inject energy into said loop to force a rapid increase of an alternating current flowing through said main branch while being controlled to open to interrupt a main current, and whereby zero cross-over of the current through the mechanical main circuit breaker is realized as the amplitude of the alternating current exceeds the amplitude of the main current. An energy absorbing device is adapted to limit the voltage across said capacitor and said mechanical breaker when the mechanical breaker is open, and across an inductive element if the voltage across the mechanical breaker breaks down, at or immediately after an opening process, thereby limiting the rate-of-rise and the peak of the current through said loop.Type: GrantFiled: June 28, 2018Date of Patent: January 26, 2021Assignee: SCIBREAK ABInventors: Staffan Norrga, Lennart Ängquist, Tomas Modéer
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Publication number: 20200251295Abstract: A circuit breaker comprises a switch and an actuator comprising a displaceable shaft mechanically connected to a movable contact in the switch. A Thomson coil is adapted to displace the shaft in a first direction, and a disconnecting device is connected in series with the switch and that is adapted to open during an interval when current is extinguished. An energy storage is provided being a separate part from the shaft and being adapted to store energy when the shaft moves in the first direction and to release energy to displace the shaft in a second direction, comprising a mass-spring arrangement with a body, a first spring between the shaft and one end portion of the body at a side facing the shaft and a second spring at a first end portion connected to a side of the body facing from the shaft and at second end portion being fixed. The movement of the body continues undisturbed to achieve a time interval wherein a current is extinguished.Type: ApplicationFiled: July 13, 2018Publication date: August 6, 2020Applicant: SCIBREAK ABInventors: Lennart ÄNGQUIST, Staffan NORRGA, Antoine BAUDOIN
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Publication number: 20190013662Abstract: An arrangement for interrupting current comprising a first and a second terminal adapted to electrically connect two sections of a power system is provided. A voltage control means is controllable in use to inject energy into said loop to force a rapid increase of an alternating current flowing through said main branch while being controlled to open to interrupt a main current, and whereby zero cross-over of the current through the mechanical main circuit breaker is realized as the amplitude of the alternating current exceeds the amplitude of the main current. An energy absorbing device is adapted to limit the voltage across said capacitor and said mechanical breaker when the mechanical breaker is open, and across an inductive element if the voltage across the mechanical breaker breaks down, at or immediately after an opening process, thereby limiting the rate-of-rise and the peak of the current through said loop.Type: ApplicationFiled: June 28, 2018Publication date: January 10, 2019Inventors: Staffan Norrga, Lennart Ängquist, Tomas Modéer
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Publication number: 20170178844Abstract: An arrangement for interrupting current comprises a first and a second terminal. First, second, and third parallel circuit branches are arranged between the terminals to electrically connect two power networks. The first parallel circuit branch comprises a mechanical main circuit breaker, the second parallel circuit branch comprises an energy absorbing device, and the third parallel circuit branch comprises a resonant circuit and a voltage control means arranged in series. The voltage control means is controllable to inject energy into the resonant circuit to force a rapid increase of alternating current, wherein the alternating current flows in a loop containing the first and the third parallel circuit branches as the mechanical main circuit breaker is controlled to open to interrupt main current. Zero cross-over of the current through the mechanical main circuit breaker is thereby realized as the alternating current amplitude exceeds the main current amplitude.Type: ApplicationFiled: December 30, 2016Publication date: June 22, 2017Inventors: Lennart ÄNGQUIST, Staffan NORRGA
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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: 8519679Abstract: A one-phase static var compensator apparatus includes a compensator string consisting of a first static var compensator connected serially to a thyristor valve. The compensator string is arranged to be connected on its first end to one phase of a transmission grid of a rated voltage exceeding 69 kV. Moreover, the thyristor valve includes a plurality of thyristors connected serially and the compensator string is arranged to be directly connected to the transmission grid. A corresponding three phase apparatus is also presented.Type: GrantFiled: September 13, 2012Date of Patent: August 27, 2013Assignee: ABB Technology AGInventors: Lennart Angquist, Lars Paulsson, Ake Petersson, Bjorn Thordvaldsson
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Patent number: 8400119Abstract: A one-phase static var compensator apparatus includes a compensator string consisting of a first static var compensator connected serially to a thyristor valve. The compensator string is arranged to be connected on its first end to one phase of a transmission grid of a rated voltage exceeding 69 kV. Moreover, the thyristor valve includes a plurality of thyristors connected serially and the compensator string is arranged to be directly connected to the transmission grid. A corresponding three phase apparatus is also presented.Type: GrantFiled: June 27, 2011Date of Patent: March 19, 2013Assignee: ABB Technology AGInventors: Lennart Angquist, Lars Paulsson, Ake Petersson, Bjorn Thordvaldsson
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Patent number: 8374810Abstract: A method for calculating insertion indices for a phase leg of a DC to AC modular multilevel converter. Each phase leg includes two serially connected arms, wherein each arm includes a number of submodules, wherein each submodule can be in a bypass state or a voltage insert mode. The insertion index includes data representing the portion of available submodules that should be in the voltage insert mode. The method includes the steps of: calculating a desired arm voltage for an upper arm connected to the upper DC source common bar and a lower arm connected to the lower DC source common bar, obtaining values representing actual total arm voltages in the upper arm and lower arm, respectively, and calculating modulation indices for the upper and lower arm, respectively, using the respective desired arm voltage and the respective value representing the total actual arm voltage. A corresponding apparatus is also presented.Type: GrantFiled: March 5, 2012Date of Patent: February 12, 2013Assignee: ABB Technology AGInventor: Lennart Angquist
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Publication number: 20130009614Abstract: A one-phase static var compensator apparatus includes a compensator string consisting of a first static var compensator connected serially to a thyristor valve. The compensator string is arranged to be connected on its first end to one phase of a transmission grid of a rated voltage exceeding 69 kV. Moreover, the thyristor valve includes a plurality of thyristors connected serially and the compensator string is arranged to be directly connected to the transmission grid. A corresponding three phase apparatus is also presented.Type: ApplicationFiled: September 13, 2012Publication date: January 10, 2013Inventors: Lennart Angquist, Lars Paulsson, Ake Petersson, Bjorn Thordvaldsson
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Patent number: 8310095Abstract: A power compensator for an electric power transmission line. The power compensator includes a voltage source converter, a capacitor and an energy storage device. The energy storage device includes a high voltage battery having a short circuit failure mode, a first main switch and second main switch for disconnecting the battery from the capacitor, and a control unit for operating the first and second switch.Type: GrantFiled: June 30, 2006Date of Patent: November 13, 2012Assignee: ABB Research Ltd.Inventors: Lennart Ängquist, Magnus Callavik, Willy Hermansson, Stefan Johansson, Gunnar Russberg, Jan R. Svensson
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Publication number: 20120191391Abstract: A method for calculating insertion indices for a phase leg of a DC to AC modular multilevel converter. Each phase leg includes two serially connected arms, wherein each arm includes a number of submodules, wherein each submodule can be in a bypass state or a voltage insert mode. The insertion index includes data representing the portion of available submodules that should be in the voltage insert mode. The method includes the steps of: calculating a desired arm voltage for an upper arm connected to the upper DC source common bar and a lower arm connected to the lower DC source common bar, obtaining values representing actual total arm voltages in the upper arm and lower arm, respectively, and calculating modulation indices for the upper and lower arm, respectively, using the respective desired arm voltage and the respective value representing the total actual arm voltage. A corresponding apparatus is also presented.Type: ApplicationFiled: March 5, 2012Publication date: July 26, 2012Inventor: Lennart Angquist
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Patent number: 8154896Abstract: A static compensator system for providing reactive and/or active power to a power network. The system includes a static compensator, which has a DC capacitor Ud and a voltage source converter. The static compensator is connected to an energy storage device. The system further includes a booster converter device connected in series with the energy storage device and in parallel with the DC capacitor Ud of the static compensator. The booster converter device and the energy storage device are further connected in parallel with the voltage source converter of the static compensator.Type: GrantFiled: March 12, 2010Date of Patent: April 10, 2012Assignee: ABB Technology AGInventor: Lennart Angquist
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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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Patent number: 8072192Abstract: A power supply apparatus includes a coupling capacitor arranged to be connected on its first end to ground; a transformer including a primary winding and a secondary winding; a first rectifier bridge connected in parallel with the secondary winding; and an energy storage, to which a load is arranged to be connected. The primary winding is arranged to be connected between a second end of the coupling capacitor and a high voltage transmission line such that all current between the second end of the coupling capacitor and the high voltage transmission line passes through the primary winding. The energy storage is arranged to be charged by means of a current passing through the first rectifier bridge. Furthermore, the power supply apparatus includes a bypasser. A corresponding three-phase apparatus is also presented.Type: GrantFiled: November 24, 2009Date of Patent: December 6, 2011Assignee: ABB Technology AGInventor: Lennart Angquist
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Publication number: 20110254518Abstract: A one-phase static var compensator apparatus includes a compensator string consisting of a first static var compensator connected serially to a thyristor valve. The compensator string is arranged to be connected on its first end to one phase of a transmission grid of a rated voltage exceeding 69 kV. Moreover, the thyristor valve includes a plurality of thyristors connected serially and the compensator string is arranged to be directly connected to the transmission grid. A corresponding three phase apparatus is also presented.Type: ApplicationFiled: June 27, 2011Publication date: October 20, 2011Inventors: Lennart Angquist, Lars Paulsson, Ake Petersson, Bjorn Thordvaldsson
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Patent number: 7986132Abstract: A one-phase static var compensator apparatus includes a compensator string consisting of a first static var compensator connected serially to a thyristor valve. The compensator string is arranged to be connected on its first end to one phase of a transmission grid of a rated voltage exceeding 69 kV. Moreover, the thyristor valve includes a plurality of thyristors connected serially and the compensator string is arranged to be directly connected to the transmission grid. A corresponding three phase apparatus is also presented.Type: GrantFiled: November 18, 2009Date of Patent: July 26, 2011Assignee: ABB Technology AGInventors: Lennart Angquist, Lars Paulsson, Ake Petersson, Bjorn Thordvaldsson
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Patent number: 7936091Abstract: An energy supply system adapted for supplying energy to equipment on a high voltage platform. The system includes a fuel cell and an effectuating capacitor. The system also includes an intermediate storage and supply unit. This unit stores energy from the fuel cell and supplies energy to the effectuating capacitor via an electric transforming unit. A high voltage platform including the energy supply system. An electrical network including the platform. A method for supplying energy to equipment on a high voltage platform.Type: GrantFiled: March 23, 2006Date of Patent: May 3, 2011Assignee: ABB Technology Ltd.Inventors: Lennart Ängquist, Per Halvarsson, Bengt Stridh, Torbjörn Ringvall
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Patent number: 7839125Abstract: A method for controlling the power flow in an ac transmission line including prompt handling of voltage recovery and only thereafter thermal constraints.Type: GrantFiled: February 22, 2007Date of Patent: November 23, 2010Assignee: ABB Research Ltd.Inventors: Bertil Berggren, Lennart Ängquist