Patents by Inventor Quianjin Liu

Quianjin Liu 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).

  • THYRISTOR CONTROLLIED SERIES CAPACITOR ADAPTED TO DAMP SUB SYNCHRONOUS RESONANCES
    Publication number: 20100133915
    Abstract: An apparatus for controlling a thyristor controlled series capacitor connected to a power transmission line. A thyristor firing control includes a unit for effectuating a desired capacitor voltage zero crossing in dependence of a line current and a capacitor voltage in response to a command signal. A command control provides the command signal to the thyristor firing control. The command control includes a damping control including a damper configured to damp at a least one discrete frequency.
    Type: Application
    Filed: May 30, 2006
    Publication date: June 3, 2010
    Applicant: ABB Research LTD
    Inventors: Gunnar Asplund, Changchun Zhou, Quianjin Liu