Patents by Inventor Gaurav-Kumar KASAL

Gaurav-Kumar KASAL 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: 11476658
    Abstract: A first converter station is part of a high voltage direct current transmission system that includes a DC transmission link connected to the first converter station a second converter station. A DC current and a DC voltage of the DC transmission link are sensed by the first converter station. It is determined that the sensed DC current is equal to or larger than a threshold current value, that the sensed DC current is equal to or larger than the threshold current value, and that at least a partial recovery of the sensed DC voltage has occurred. On the basis that it is determined that the at least a partial recovery of the sensed DC voltage has occurred, it is determined that a phase-to-ground fault has occurred. In response to determining that a phase-to-ground fault has occurred, a power delivered by the first converter station can be reduced.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: October 18, 2022
    Assignee: Hitachi Energy Switzerland AG
    Inventors: Saurav Roy-Choudhury, Ying Jiang-Häfner, Gaurav-Kumar Kasal, Morteza Mohammadi, Mats Andersson
  • Publication number: 20200412128
    Abstract: A first converter station is part of a high voltage direct current transmission system that includes a DC transmission link connected to the first converter station a second converter station. A DC current and a DC voltage of the DC transmission link are sensed by the first converter station. It is determined that the sensed DC current is equal to or larger than a threshold current value, that the sensed DC current is equal to or larger than the threshold current value, and that at least a partial recovery of the sensed DC voltage has occurred. On the basis that it is determined that the at least a partial recovery of the sensed DC voltage has occurred, it is determined that a phase-to-ground fault has occurred. In response to determining that a phase-to-ground fault has occurred, a power delivered by the first converter station can be reduced.
    Type: Application
    Filed: December 21, 2017
    Publication date: December 31, 2020
    Inventors: Saurav Roy-Choudhury, Ying Jiang-Häfner, Gaurav-Kumar Kasal, Morteza Mohammadi, Mats Andersson
  • Patent number: 10050551
    Abstract: An arrangement, method and computer program product are provided for limiting circulating currents in a converter converting between AC and DC. The converter has a number of AC and DC terminals and includes a number of converter arms, where a first and a second converter arm are connected in parallel between a first DC terminal and a first AC terminal. Each converter arm includes a string of series-connected converter cells. The arrangement includes a control unit that obtains a current of the first converter arm and a current of the second converter arm, forms an average of the two converter arm currents, forms a first and a second voltage control signal based on the average and uses the first and second voltage control signal in the control of the voltage provided by the first and second converter arm.
    Type: Grant
    Filed: July 28, 2015
    Date of Patent: August 14, 2018
    Assignee: ABB SCHWEIZ AG
    Inventors: Sri Ramya Kalluri, Gaurav-Kumar Kasal, Ying Jiang-Häfner, Jürgen Häfner
  • Publication number: 20180219491
    Abstract: An arrangement, method and computer program product are provided for limiting circulating currents in a converter converting between AC and DC. The converter has a number of AC and DC terminals and includes a number of converter arms, where a first and a second converter arm are connected in parallel between a first DC terminal and a first AC terminal. Each converter arm includes a string of series-connected converter cells. The arrangement includes a control unit that obtains a current of the first converter arm and a current of the second converter arm, forms an average of the two converter arm currents, forms a first and a second voltage control signal based on the average and uses the first and second voltage control signal in the control of the voltage provided by the first and second converter arm.
    Type: Application
    Filed: July 28, 2015
    Publication date: August 2, 2018
    Applicant: ABB SCHWEIZ AG
    Inventors: Sri Ramya KALLURI, Gaurav-Kumar KASAL, Ying JIANG-HÄFNER, Jürgen HÄFNER