Patents by Inventor Takefumi Iizaka

Takefumi Iizaka 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).

  • Combined power generation system having power converting apparatus
    Patent number: 9698603
    Abstract: A first internal phase difference angle calculator for integrating a deviation between a first frequency command value and a frequency obtained by frequency obtaining device to calculate a first internal phase difference angle, a first internal electromotive voltage command value calculator for proportioning and calculating a deviation between a first reactive power command value and a reactive power obtained based on the value measured by first measuring device, and adding a reference voltage to the deviation so as to calculate a first internal electromotive voltage command value, and a first current command value calculator for calculating a command value of an output current from a first power converter based on the first internal phase difference angle, the first internal electromotive voltage command value, and a voltage measured by the voltage measuring device. The apparatus controls the first power converter based on an output from the first current command value calculator.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: July 4, 2017
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kazushige Sugimoto, Masahide Kawamura, Kentaro Sakata, Mitsuchika Ogawa, Kentaro Tsuda, Takefumi Iizaka, Yuko Hirase
  • Electric power converter for combined power generation system
    Patent number: 9356448
    Abstract: The present invention provides an electric power converting unit that does not require a change in a control method in, for example, system interconnection by calculating a target value of an output current of an electric power converter from an internal phase angle calculated from an active electric power control loop and an internal electromotive voltage calculated from a reactive electric power control loop. Thus, a stand-alone power supply system that is easy to handle can be configured.
    Type: Grant
    Filed: July 4, 2012
    Date of Patent: May 31, 2016
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kazushige Sugimoto, Masahide Kawamura, Kentaro Sakata, Mitsuchika Ogawa, Kentaro Tsuda, Takefumi Iizaka, Yuko Hirase
  • COMBINED POWER GENERATION SYSTEM HAVING POWER CONVERTING APPARATUS
    Publication number: 20150357820
    Abstract: A first internal phase difference angle calculator for integrating a deviation between a first frequency command value and a frequency obtained by frequency obtaining device to calculate a first internal phase difference angle, a first internal electromotive voltage command value calculator for proportioning and calculating a deviation between a first reactive power command value and a reactive power obtained based on the value measured by first measuring device, and adding a reference voltage to the deviation so as to calculate a first internal electromotive voltage command value, and a first current command value calculator for calculating a command value of an output current from a first power converter based on the first internal phase difference angle, the first internal electromotive voltage command value, and a voltage measured by the voltage measuring device. The apparatus controls the first power converter based on an output from the first current command value calculator.
    Type: Application
    Filed: December 5, 2013
    Publication date: December 10, 2015
    Inventors: Kazushige SUGIMOTO, Masahide KAWAMURA, Kentaro SAKATA, Mitsuchika OGAWA, Kentaro TSUDA, Takefumi IIZAKA, Yuko HIRASE
  • ELECTRIC POWER CONVERTER FOR COMBINED POWER GENERATION SYSTEM
    Publication number: 20140152110
    Abstract: The present invention provides an electric power converting unit that does not require a change in a control method in, for example, system interconnection by calculating a target value of an output current of an electric power converter from an internal phase angle calculated from an active electric power control loop and an internal electromotive voltage calculated from a reactive electric power control loop. Thus, a stand-alone power supply system that is easy to handle can be configured.
    Type: Application
    Filed: July 4, 2012
    Publication date: June 5, 2014
    Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kazushige Sugimoto, Masahide Kawamura, Kentaro Sakata, Mitsuchika Ogawa, Kentaro Tsuda, Takefumi Iizaka, Yuko Hirase