Patents by Inventor Kenta KIRIHARA

Kenta KIRIHARA 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).

  • Patent number: 11048246
    Abstract: A manipulation candidate classification unit provided in this operation assistance device classifies manipulation logs associated with a plurality of events stored in a past case database, as manipulation candidates, on the basis of measured value feature quantity tolerance ranges, and groups the classified manipulation candidates and the measured value feature quantity tolerance ranges together to create manipulation candidate groups. A manipulation candidate search unit searches a manipulation candidate database for a manipulation candidate group associated with a feature quantity that is associated with a past event and that is close to a feature quantity associated with a new event, and outputs the found manipulation candidate group to an output unit.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: June 29, 2021
    Assignee: Hitachi, Ltd.
    Inventors: Nao Saito, Kenta Kirihara, Masahiro Yatsu
  • Patent number: 11016515
    Abstract: A system operation decision-making assistance device includes: a state mode clustering unit that calculates, on the basis of measurement data DB1 of a power system and a clustering parameter DB3, which state mode, from among prescribed state modes, applies to a power system; a state mode collation unit that collates state transition data DB4 indicating transitions between state modes and the calculated state mode to calculate state transition probability data, which is the probability of transitioning from the calculated state mode to each state mode defined in the state transition data; and an accident shift pattern calculation unit that calculates important accident cases on the basis of a system model DB2, an importance parameter DB5 including the importance of a power system accident, the measurement data, and the calculated state transition probability data.
    Type: Grant
    Filed: October 6, 2017
    Date of Patent: May 25, 2021
    Assignee: HITACHI, LTD.
    Inventors: Kenta Kirihara, Nao Saito, Taichiro Kawahara, Masahiro Yatsu
  • Publication number: 20210126453
    Abstract: This power system operation assisting device is provided with: a multiple signal frequency specifying unit that uses, as inputs, measured data of an object to be measured and a frequency specifying parameter for calculating a frequency component of the measured data to calculate an oscillation frequency; a generation source candidate calculation unit that uses, as an input, the calculated oscillation frequency to calculate a generation source candidate of an unstable oscillation occurring in a power system; a generation source guarantee test unit that calculates the guarantee test result of the generation source candidate; and a display unit that displays the oscillation frequency, the generation source candidate, and the guarantee test result.
    Type: Application
    Filed: March 11, 2019
    Publication date: April 29, 2021
    Inventors: Kenta KIRIHARA, Akira TSUBOTA, Yutaka KOKAI, Sumito TOBE, Masahiro YATSU, Hiroo HORII
  • Publication number: 20210103365
    Abstract: An operation support device is provided with: a similarity determination unit for determining the similarity between actual measured data and simulated data, said actual measured data being measured in an operation target after performing control on the operation target on the basis of, among a plurality of control candidates managed using a control candidate table, a control candidate corresponding to an event having occurred in the operation target, said simulated data being obtained by a simulation assuming the system state of the operation target after performing control on the operation target on the basis of system data indicating the state of the operation target before performing the control on the operation target; and a control candidate table update unit for updating the control candidate table in accordance with the determination result of the similarity determination unit.
    Type: Application
    Filed: April 18, 2018
    Publication date: April 8, 2021
    Inventors: Nao SAITO, Kenta KIRIHARA, Masahiro YATSU
  • Publication number: 20210083475
    Abstract: A system operation support device in a power system stabilizes the power system and has a predicted accident time system state calculation unit that receives measured data, a system topology, and a target accident type as inputs, and calculates a system state and a predicted accident time system state. A control menu calculation unit receives the results of the predicted accident time system state as inputs and calculates a control menu. A restoration control means calculation unit receives the result of the control menu calculation as an input and calculates a restoration control procedure. A restoration prevention control procedure calculation unit receives the result of the restoration control and a target restoration time parameter as inputs and performs a power generator output adjustment time simulation, a necessary prevention control amount calculation, and a prevention control procedure calculation. A display unit displays the restoration control procedure and the prevention control procedure.
    Type: Application
    Filed: April 10, 2018
    Publication date: March 18, 2021
    Inventors: Kenta KIRIHARA, Sumito TOBE, Masahiro YATSU, Hiroo HORII, Jun YAMAZAKI
  • Publication number: 20200273120
    Abstract: In order to provide a power grid decision-making support device and method which are capable of providing operator decision-making support, and quickly presenting control candidates, and a system which applies the same, one representative embodiment of the present invention provides a power grid decision-making support device characterized by comprising: a control candidate learning unit for deriving, by learning, a plurality of control candidate models for stabilizing a power grid; a control candidate extraction unit for extracting, from the plurality of control candidate models derived by the control candidate learning unit, control candidates using power grid measurement data and extraction parameters; a control candidate evaluation unit for evaluating the control candidates using a power grid model and the control candidates; and an information presentation unit for presenting information about the evaluation results and the control candidates.
    Type: Application
    Filed: February 24, 2017
    Publication date: August 27, 2020
    Inventors: Kenta KIRIHARA, Eisuke KURODA, Nao SAITO, Hiroo HORII, Masahiro YATSU
  • Publication number: 20190220051
    Abstract: A system operation decision-making assistance device includes: a state mode clustering unit that calculates, on the basis of measurement data DB1 of a power system and a clustering parameter DB3, which state mode, from among prescribed state modes, applies to a power system; a state mode collation unit that collates state transition data DB4 indicating transitions between state modes and the calculated state mode to calculate state transition probability data, which is the probability of transitioning from the calculated state mode to each state mode defined in the state transition data; and an accident shift pattern calculation unit that calculates important accident cases on the basis of a system model DB2, an importance parameter DB5 including the importance of a power system accident, the measurement data, and the calculated state transition probability data.
    Type: Application
    Filed: October 6, 2017
    Publication date: July 18, 2019
    Inventors: Kenta KIRIHARA, Nao SAITO, Taichiro KAWAHARA, Masahiro YATSU
  • Publication number: 20190146468
    Abstract: A manipulation candidate classification unit provided in this operation assistance device classifies manipulation logs associated with a plurality of events stored in a past case database, as manipulation candidates, on the basis of measured value feature quantity tolerance ranges, and groups the classified manipulation candidates and the measured value feature quantity tolerance ranges together to create manipulation candidate groups. A manipulation candidate search unit searches a manipulation candidate database for a manipulation candidate group associated with a feature quantity that is associated with a past event and that is close to a feature quantity associated with a new event, and outputs the found manipulation candidate group to an output unit.
    Type: Application
    Filed: June 30, 2017
    Publication date: May 16, 2019
    Applicant: Hitachi, Ltd.
    Inventors: Nao SAITO, Kenta KIRIHARA, Masahiro YATSU