Patents by Inventor Morteza Mohammadi

Morteza Mohammadi 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).

  • Communication less control technique for hybrid HVDC
    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
  • Communication Less Control Technique for Hybrid HVDC
    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