Patents by Inventor Ryo Egashira

Ryo Egashira 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).

  • Photovoltaic power generator output estimation method and device, and power system monitoring device using same
    Patent number: 10211777
    Abstract: The output of a photovoltaic power generator is estimated by estimating a solar radiation amount at a point different from solar radiation measurement points and determining an estimation error amount from solar radiation values measured at limited points. A photovoltaic power generator output estimation method estimates an output of a photovoltaic power generator based on a measured solar radiation value.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: February 19, 2019
    Assignees: Hitachi, Ltd., Tohoku Electric Power Co., Inc., Tohoku Electric Manufacturing Co., Ltd.
    Inventors: Masahiro Watanabe, Kenichiro Yamane, Takuya Matsumoto, Masatoshi Kumagai, Tsukasa Oonishi, Ryo Egashira, Katsuhiro Matsuda, Jun Murakoshi, Tomoya Sato
  • Voltage adjustment device for power distribution system, voltage adjusting method, and power control system
    Patent number: 9606554
    Abstract: A voltage adjustment device, a voltage adjusting method and a power control system for a distribution system are provided, in which the voltage adjustment device and a static var compensator are appropriately operated in a coordinated manner and the sustention of voltage and the enhancement of the operation efficiency are attained. A voltage adjustment device for a distribution system is installed in the distribution system including a static var compensator on an end side and controls a secondary voltage to be within a predetermined limit value by adjusting a tap position.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: March 28, 2017
    Assignees: Hitachi, Ltd., Tohoku Electric Power Co., Ltd., Tohoku Electric Manufacturing Co., Ltd.
    Inventors: Masahiro Watanabe, Ryo Egashira, Kenichiro Yamane, Katsuhiro Matsuda, Takafumi Futakami, Toshiyuki Seto, Jun Murakoshi
  • Photovoltaic Power Generator Output Estimation Method and Device, and Power System Monitoring Device Using Same
    Publication number: 20170012580
    Abstract: The output of a photovoltaic power generator is estimated by estimating a solar radiation amount at a point different from solar radiation measurement points and determining an estimation error amount from solar radiation values measured at limited points. A photovoltaic power generator output estimation method estimates an output of a photovoltaic power generator based on a measured solar radiation value.
    Type: Application
    Filed: January 14, 2015
    Publication date: January 12, 2017
    Inventors: Masahiro WATANABE, Kenichiro YAMANE, Takuya MATSUMOTO, Masatoshi KUMAGAI, Tsukasa OONISHI, Ryo EGASHIRA, Katsuhiro MATSUDA, Jun MURAKOSHI, Tomoya SATO
  • VOLTAGE ADJUSTMENT DEVICE FOR POWER DISTRIBUTION SYSTEM, VOLTAGE ADJUSTING METHOD, AND POWER CONTROL SYSTEM
    Publication number: 20150286227
    Abstract: A voltage adjustment device, a voltage adjusting method and a power control system for a distribution system are provided, in which the voltage adjustment device and a static var compensator are appropriately operated in a coordinated manner and the sustention of voltage and the enhancement of the operation efficiency are attained. A voltage adjustment device for a distribution system is installed in the distribution system including a static var compensator on an end side and controls a secondary voltage to be within a predetermined limit value by adjusting a tap position.
    Type: Application
    Filed: July 24, 2013
    Publication date: October 8, 2015
    Inventors: Masahiro Watanabe, Ryo Egashira, Kenichiro Yamane, Katsuhiro Matsuda, Takafumi Futakami, Toshiyuki Seto, Jun Murakoshi