Patents by Inventor Piniwan Thiwanka Bandara Wijekoon

Piniwan Thiwanka Bandara Wijekoon 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).

  • Patent number: 10211644
    Abstract: A power distribution system for providing a desired value of voltage regulation is presented. The system includes at least one power source, at least one sink, a distribution feeder configured to couple the at least one power source to the at least one sink. The system includes a plurality of modular voltage regulation units coupled to the distribution feeder, where each of the plurality of modular voltage regulation units includes a transformer including a primary winding having a first end and a second end and a secondary winding having a first end and a second end; and at least one switch coupled to the primary winding of the transformer, where the first end of the secondary winding is coupled to at least one of the first and second ends of the primary winding via the at least one switch. A method of operating a power distribution system is also presented.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: February 19, 2019
    Assignee: ABB Schweiz AG
    Inventors: Ara Panosyan, Piniwan Thiwanka Bandara Wijekoon, Stefan Schroeder, Eva-Maria Baerthlein
  • Publication number: 20180278155
    Abstract: The invention relates to a supply system for a plurality of loads connected in parallel to a direct current supply bus. The supply system includes a DC supply bus and a plurality of supply lines connected in parallel to the supply bus and supplying the said loads. The supply system includes uncoupling and damping means that is adapted to decrease the unipolar signals travelling within the supply system while the loads are being supplied. The uncoupling and damping means includes at least one inductance arranged in series in at least one of the supply lines. Protective means (are also provided for protection in the event of a fault.
    Type: Application
    Filed: September 26, 2016
    Publication date: September 27, 2018
    Inventors: Elise SAVARIT, Piniwan Thiwanka Bandara WIJEKOON, Nicolas LAPASSAT, Jean-Louis POULIQUEN, Nicolas GRUAU
  • Patent number: 9777966
    Abstract: A subsea power module includes an outer pressure compensated vessel defining an interior chamber and one or more heat generating electrical components disposed within the interior chamber. The outer pressure compensated vessel is configured to maintain a pressure within the interior chamber substantially the same as an ambient pressure outside the outer pressure compensated vessel. Each of the electrical components may be disposed within an inner chamber of a pressure vessel disposed within the interior chamber of the outer pressure compensated vessel. Each of the one or more heat generating electrical components is configured to transfer heat generated within the interior chamber of the outer pressure compensated vessel through the wall defining the interior chamber to a fluid, such as seawater, surrounding the outer pressure compensated vessel.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: October 3, 2017
    Assignee: General Electric Company
    Inventors: Mark Aaron Chan Chan, Stefan Schroeder, Piniwan Thiwanka Bandara Wijekoon, Eric Ayres Browne
  • Patent number: 9774183
    Abstract: A subsea power distribution module includes an outer vessel defining an interior chamber and a plurality of power modules disposed within the interior chamber. The outer vessel is configured to maintain a pressure within the interior chamber substantially the same as an ambient pressure outside the outer vessel. Each power module includes a pressure vessel defining an interior chamber and a power converter disposed within the interior chamber of the pressure vessel. Each pressure vessel is configured to maintain a substantially constant pressure within the interior chamber of the pressure vessel.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: September 26, 2017
    Assignee: General Electric Company
    Inventors: Christof Martin Sihler, Manoj Ramprasad Shah, Simon Herbert Schramm, Svend Erik Rocke, Piniwan Thiwanka Bandara Wijekoon
  • Publication number: 20170250542
    Abstract: A power distribution system for providing a desired value of voltage regulation is presented. The system includes at least one power source, at least one sink, a distribution feeder configured to couple the at least one power source to the at least one sink. The system includes a plurality of modular voltage regulation units coupled to the distribution feeder, where each of the plurality of modular voltage regulation units includes a transformer including a primary winding having a first end and a second end and a secondary winding having a first end and a second end; and at least one switch coupled to the primary winding of the transformer, where the first end of the secondary winding is coupled to at least one of the first and second ends of the primary winding via the at least one switch. A method of operating a power distribution system is also presented.
    Type: Application
    Filed: February 26, 2016
    Publication date: August 31, 2017
    Inventors: Ara Panosyan, Piniwan Thiwanka Bandara Wijekoon, Stefan Schroeder, Eva-Maria Baerthlein
  • Patent number: 9627862
    Abstract: A submersible power system includes at least one DC power source and at least one submersible power distribution system electrically coupled to the at least one DC power source. The at least one submersible power distribution system includes at least one receptacle configured to be exposed to an underwater environment. The at least one submersible power distribution system also includes a plurality of power conversion modules removably positioned within the at least one receptacle. Each power conversion module of the plurality of power conversion modules includes an enclosure configured to be exposed to the underwater environment. The at least one submersible power distribution system further includes at least one switchyard module selectably coupled to and uncoupled from the plurality of power conversion modules. The at least one switchyard module includes a plurality of switches configured to electrically bypass and isolate each power conversion module from the DC power source.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: April 18, 2017
    Assignee: General Electric Company
    Inventors: Nicolai Hytten, Piniwan Thiwanka Bandara Wijekoon, Jean-Louis Pouliquen, Henri Baerd, Christof Martin Sihler
  • Patent number: 9570252
    Abstract: A system for operating an on-load tap changer (OLTC) includes a plurality of legs that include mechanical switches. At least one leg switches from a first to a second tap of the OLTC on receipt of a tap change signal. At least one mechanical switch is activated to establish an electrical connection between one of the first and the second tap and a power terminal of the OLTC. Further, the system includes semiconductor switches that are parallel to the mechanical switches and when activated electrically couple one of the first and the second tap and the power terminal. The system includes a processing unit that selectively activates and deactivates the mechanical and semiconductor switches in such a way that electrical contact is maintained between at least one of the taps and the power terminal during the transition of at least one leg from the first tap to the second tap.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: February 14, 2017
    Assignee: General Electric Company
    Inventors: Piniwan Thiwanka Bandara Wijekoon, Eva-Maria Baerthlein, Simon Herbert Schramm, Stefan Schroeder, Ara Panosyan, Rohit Kumar Gupta
  • Patent number: 9439316
    Abstract: A submersible power distribution system is provided. The system includes at least one receptacle configured to be exposed to an underwater environment and a plurality of power conversion modules positioned within the at least one receptacle. Each of the plurality of power conversion modules includes a first enclosure configured to be exposed to the underwater environment, the first enclosure defining a first interior cavity configured to have a first pressure. Power conversion modules also include at least one second enclosure positioned within the first interior cavity. The at least one second enclosure defines a second interior cavity configured to have a second pressure that is lower than the first pressure. The at least one second enclosure is configured to restrict exposure of non-pressure-tolerant power electronics in the second interior cavity to the first pressure.
    Type: Grant
    Filed: April 3, 2014
    Date of Patent: September 6, 2016
    Assignee: General Electric Company
    Inventors: Piniwan Thiwanka Bandara Wijekoon, Christof Martin Sihler, Stefan Schroeder, Mark Aaron Chan
  • Patent number: 9419536
    Abstract: A DC power transmission system is configured to generate an electric field including components substantially constant with respect to time and varying with time. The DC power transmission system includes an AC stage configured to receive AC electrical power. The AC stage includes a transformer including primary windings and secondary windings configured to be electromagnetically coupled to, and electrically isolated from, each other. The AC stage also includes an AC/AC converter having substantially no insulating features against the at least one substantially constant component of the electric field. The AC/AC converter is electrically coupled to the primary windings. The DC power transmission system also includes an AC/DC conversion stage positioned downstream of the AC stage. The AC/DC conversion stage includes an AC/DC rectifier configured to convert AC electrical power to DC electrical power without external control. The AC/DC rectifier is coupled to the secondary windings.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: August 16, 2016
    Assignee: General Electric Company
    Inventors: Piniwan Thiwanka Bandara Wijekoon, Christof Martin Sihler, Stefan Schroeder, Jie Shen, Pierluigi Tenca
  • Patent number: 9331481
    Abstract: A power transmission system is provided. The power transmission system includes at least one power substation for receiving power from a power source, and a Direct Current (DC) cable for transferring the power from the power source to the power substation. The DC cable includes a plurality of segments individually or in combination forming a path to route the power to the power substation. The system further includes at least one segment switch unit electrically coupled to each segment. At least one of the segment switch units includes a shorting switch element for providing a short circuit path to prevent the power from the power source to be routed to a respective segment in response to a shorting command, and a disconnect switch element for disconnecting the respective segment in response to a disconnect command.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: May 3, 2016
    Assignee: General Electric Company
    Inventors: Piniwan Thiwanka Bandara Wijekoon, Christof Martin Sihler, Simon Herbert Schramm
  • Publication number: 20150289403
    Abstract: A submersible power distribution system is provided. The system includes at least one receptacle configured to be exposed to an underwater environment and a plurality of power conversion modules positioned within the at least one receptacle. Each of the plurality of power conversion modules includes a first enclosure configured to be exposed to the underwater environment, the first enclosure defining a first interior cavity configured to have a first pressure. Power conversion modules also include at least one second enclosure positioned within the first interior cavity. The at least one second enclosure defines a second interior cavity configured to have a second pressure that is lower than the first pressure. The at least one second enclosure is configured to restrict exposure of non-pressure-tolerant power electronics in the second interior cavity to the first pressure.
    Type: Application
    Filed: April 3, 2014
    Publication date: October 8, 2015
    Applicant: General Electric Company
    Inventors: Piniwan Thiwanka Bandara Wijekoon, Christof Martin Sihler, Stefan Schroeder, Mark Aaron Chan
  • Publication number: 20150249402
    Abstract: A DC power transmission system is configured to generate an electric field including components substantially constant with respect to time and varying with time. The DC power transmission system includes an AC stage configured to receive AC electrical power. The AC stage includes a transformer including primary windings and secondary windings configured to be electromagnetically coupled to, and electrically isolated from, each other. The AC stage also includes an AC/AC converter having substantially no insulating features against the at least one substantially constant component of the electric field. The AC/AC converter is electrically coupled to the primary windings. The DC power transmission system also includes an AC/DC conversion stage positioned downstream of the AC stage. The AC/DC conversion stage includes an AC/DC rectifier configured to convert AC electrical power to DC electrical power without external control. The AC/DC rectifier is coupled to the secondary windings.
    Type: Application
    Filed: February 28, 2014
    Publication date: September 3, 2015
    Applicant: General Electric Company
    Inventors: Piniwan Thiwanka Bandara Wijekoon, Christof Martin Sihler, Stefan Schroeder, Jie Shen, Pierluigi Tenca
  • Publication number: 20150216080
    Abstract: A subsea power module includes an outer pressure compensated vessel defining an interior chamber and one or more heat generating electrical components disposed within the interior chamber. The outer pressure compensated vessel is configured to maintain a pressure within the interior chamber substantially the same as an ambient pressure outside the outer pressure compensated vessel. Each of the electrical components may be disposed within an inner chamber of a pressure vessel disposed within the interior chamber of the outer pressure compensated vessel. Each of the one or more heat generating electrical components is configured to transfer heat generated within the interior chamber of the outer pressure compensated vessel through the wall defining the interior chamber to a fluid, such as seawater, surrounding the outer pressure compensated vessel.
    Type: Application
    Filed: January 30, 2014
    Publication date: July 30, 2015
    Applicant: General Electric Company
    Inventors: Mark Aaron Chan Chan, Stefan Schroeder, Piniwan Thiwanka Bandara Wijekoon, Eric Ayres Browne
  • Publication number: 20150213971
    Abstract: A system for operating an on-load tap changer (OLTC) includes a plurality of legs that include mechanical switches. At least one leg switches from a first to a second tap of the OLTC on receipt of a tap change signal. At least one mechanical switch is activated to establish an electrical connection between one of the first and the second tap and a power terminal of the OLTC. Further, the system includes semiconductor switches that are parallel to the mechanical switches and when activated electrically couple one of the first and the second tap and the power terminal. The system includes a processing unit that selectively activates and deactivates the mechanical and semiconductor switches in such a way that electrical contact is maintained between at least one of the taps and the power terminal during the transition of at least one leg from the first tap to the second tap.
    Type: Application
    Filed: January 27, 2014
    Publication date: July 30, 2015
    Inventors: Piniwan Thiwanka Bandara Wijekoon, Eva-Maria Baerthlein, Simon Herbert Schramm, Stefan Schroeder, Ara Panosyan, Rohit Kumar Gupta
  • Patent number: 9087635
    Abstract: A load tap changer includes a mechanical switch, a semiconductor switch and an impedance branch or an uncontrolled semiconductor switch. The mechanical switch is connected to a power terminal of a voltage conversion device to carry an electric current and is activated to switch from a first tap to a second tap of the voltage conversion device when a tap change signal is received. The semiconductor switch is then connected between the first tap and the power terminal of the voltage conversion device and is disconnected before the mechanical switch is connected to the second tap. The impedance branch or the uncontrolled semiconductor switch is connected between the second tap and the power terminal of the voltage conversion device before the mechanical switch is connected to the second tap. The impedance or the uncontrolled semiconductor switch is disconnected after the mechanical switch is connected to the second tap.
    Type: Grant
    Filed: August 24, 2012
    Date of Patent: July 21, 2015
    Assignee: General Electric Company
    Inventors: Sebastian Pedro Rosado, Tiziana Bertoncelli, Piniwan Thiwanka Bandara Wijekoon, Ara Panosyan, Manoj Ramprasad Shah, Paolo Soldi
  • Publication number: 20150188314
    Abstract: A subsea power distribution module includes an outer vessel defining an interior chamber and a plurality of power modules disposed within the interior chamber. The outer vessel is configured to maintain a pressure within the interior chamber substantially the same as an ambient pressure outside the outer vessel. Each power module includes a pressure vessel defining an interior chamber and a power converter disposed within the interior chamber of the pressure vessel. Each pressure vessel is configured to maintain a substantially constant pressure within the interior chamber of the pressure vessel.
    Type: Application
    Filed: December 27, 2013
    Publication date: July 2, 2015
    Inventors: Christof Martin Sihler, Manoj Ramprasad Shah, Simon Herbert Schramm, Svend Erik Rocke, Piniwan Thiwanka Bandara Wijekoon
  • Publication number: 20150188315
    Abstract: A submersible power system includes at least one DC power source and at least one submersible power distribution system electrically coupled to the at least one DC power source. The at least one submersible power distribution system includes at least one receptacle configured to be exposed to an underwater environment. The at least one submersible power distribution system also includes a plurality of power conversion modules removably positioned within the at least one receptacle. Each power conversion module of the plurality of power conversion modules includes an enclosure configured to be exposed to the underwater environment. The at least one submersible power distribution system further includes at least one switchyard module selectably coupled to and uncoupled from the plurality of power conversion modules. The at least one switchyard module includes a plurality of switches configured to electrically bypass and isolate each power conversion module from the DC power source.
    Type: Application
    Filed: December 26, 2013
    Publication date: July 2, 2015
    Applicant: General Electric Company
    Inventors: Nicolai Hytten, Piniwan Thiwanka Bandara Wijekoon, Jean-Louis Pouliquen, Henri Baerd, Christof Martin Sihler
  • Patent number: 9071164
    Abstract: A multi-phase converter includes a plurality of phase paths. Each phase path includes at least one dc-link that is independent from every other phase path dc-link such that each output phase voltage is generated from a corresponding dc-link voltage source that can be different from every other phase voltage dc-link voltage source. A total dc-link voltage level is determined for each output phase voltage. A common-mode injection voltage is calculated based on all dc-link voltage levels and all phase reference voltages. Each phase path reference voltage is then adjusted based on the calculated common-mode injection voltage, such that each generated output phase voltage level is adjusted in response to its corresponding adjusted reference voltage.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: June 30, 2015
    Assignee: General Electric Company
    Inventors: Stefan Schroeder, Piniwan Thiwanka Bandara Wijekoon
  • Publication number: 20150162144
    Abstract: A method of switching taps by an on-load tap changer includes providing at least two fingers each comprising an impedance and a mechanical switch. When first and second mechanical switches of the first and second fingers are closed, they provide a connection between the first and second impedances of the first and second fingers and a power terminal of the on-load tap changer. The on-load tap changer is triggered to shift at least one of the fingers from a first tap to a second tap of the on-load tap changer when a tap change signal is received. A solid state switch connected between the first and second impedances is switched on to commutate a current from the first finger to the second finger during the tap change operation.
    Type: Application
    Filed: December 6, 2013
    Publication date: June 11, 2015
    Applicant: General Electric Company
    Inventors: Ara Panosyan, Eva-Maria Baerthlein, Simon Schramm, Stefan Schroeder, Malcolm Graham Smith, JR., Piniwan Thiwanka Bandara Wijekoon
  • Patent number: 9036379
    Abstract: A power converter includes an active front end (AFE) that is coupled by a dc link stage to a plurality of H-bridge inverters. One or more multi-phase electro-magnetic energy conversion devices, such as transformers or electric machines, with open windings that are connected to only the AFE or only the H-bridge inverters or to both the AFE and H-bridge inverters, provide a regenerative or partial regenerative power converter.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: May 19, 2015
    Assignee: General Electric Company
    Inventors: Stefan Schroeder, Piniwan Thiwanka Bandara Wijekoon