Patents by Inventor Atsuhiko KUBO

Atsuhiko KUBO 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).

  • Diagnostic method for solar power system and monitoring device
    Patent number: 9837957
    Abstract: The diagnostic method for a photovoltaic power system includes: a step of storing measured values of voltage and current outputted by a photovoltaic cell array, and identifying a first time period and a second time period with a lower solar radiation amount than in the first time period; a step of calculating the number of faulty photovoltaic cells on the basis of the measured values in the first time period; a step of calculating the number of faulty photovoltaic cells on the basis of the measured values in the second time period; and a step of comparing the number of faulty photovoltaic cells as calculated for the first time period, and the number of faulty photovoltaic cells as calculated for the second time period, and identifying a series resistance of the photovoltaic cells and a value indicating a degree of loss resulting from a fault in the photovoltaic cells.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: December 5, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Toru Kouno, Atsuhiko Kubo, Yuuichi Nagayama, Tomoharu Nakamura
  • Diagnostic Method for Solar Power System and Monitoring Device
    Publication number: 20160315584
    Abstract: The diagnostic method for a photovoltaic power system includes: a step of storing measured values of voltage and current outputted by a photovoltaic cell array, and identifying a first time period and a second time period with a lower solar radiation amount than in the first time period; a step of calculating the number of faulty photovoltaic cells on the basis of the measured values in the first time period; a step of calculating the number of faulty photovoltaic cells on the basis of the measured values in the second time period; and a step of comparing the number of faulty photovoltaic cells as calculated for the first time period, and the number of faulty photovoltaic cells as calculated for the second time period, and identifying a series resistance of the photovoltaic cells and a value indicating a degree of loss resulting from a fault in the photovoltaic cells.
    Type: Application
    Filed: April 21, 2016
    Publication date: October 27, 2016
    Inventors: Toru KOUNO, Atsuhiko KUBO, Yuuichi NAGAYAMA, Tomoharu NAKAMURA