Patents by Inventor Yasuyuki Tada
Yasuyuki Tada 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).
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Publication number: 20240074122Abstract: A power semiconductor device includes a power module unit and a heat sink. An uneven portion is formed in a module base in the power module unit. The uneven portion includes a depression portion and a buffer depression portion. An uneven portion is formed in a heat sink base unit in the heat sink. The uneven portion and the uneven portion are fitted together by crimping so that the module base of the power module unit and a heat dissipation spreader of the heat sink are integrated. The buffer depression portion is left as a space.Type: ApplicationFiled: January 14, 2022Publication date: February 29, 2024Applicant: Mitsubishi Electric CorporationInventors: Yasuyuki SANDA, Masaki GOTO, Hayato TERADA, Hodaka ROKUBUICHI, Haruna TADA
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Publication number: 20230420937Abstract: A power system operation plan creation assistance device and method capable of maintaining or improving system stability or economy includes an optimization target snapshot power flow determination unit that uses one or more pieces of foundational information to determine an optimization target snapshot power flow. The foundational information includes a power generation plan, a total demand prediction, a sales plan, a renewable energy prediction, a work stoppage plan, system data, and a setting value. A system manipulation variable candidate extraction unit uses the one or more pieces of foundational information and the optimization target snapshot power flow to extract a candidate for a variable for a variable manipulating the system. An optimal system configuration calculation unit uses the one or more pieces of foundational information and the system manipulation variable candidate to calculate an optimal system configuration.Type: ApplicationFiled: July 19, 2021Publication date: December 28, 2023Inventors: Eisuke KURODA, Kunihiko TSUNEDOMI, Daiki NISHIMURA, Shinya OHARA, Yasuyuki TADA
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Publication number: 20230378806Abstract: Disclosed is a system for supporting creation of a system plan to change a configuration of a power system including a power transmission system and a power distribution system. The system stores information on a configuration of the power transmission system and information on a configuration and a load of the power distribution system. The system determines, based on the information on the configuration and the load of the power distribution system, a load accommodation capacity between power distribution substations which indicates a power supply capacity allowed to be compensated for between the power distribution substations through a configuration change of the power distribution system. The system creates a system plan proposal including a change in system configuration of the power transmission system and the power distribution system based on the load accommodation capacity. The system outputs information on the system plan proposal to an output device.Type: ApplicationFiled: October 14, 2021Publication date: November 23, 2023Inventors: Tsubasa ICHIKAWA, Shinya SUENAGA, Yasuyuki TADA, Yasushi MIYATA, Yoshiki KUROKAWA
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Publication number: 20160292802Abstract: An asset management support system of the present invention issues a work order to an asset facility for inspection and maintenance and includes a facilities information database that stores inspection and maintenance results, a health index database that stores a state of the asset facility and surroundings around the asset facility as a health index, a comparison function that considers the health index as actual facility status of the asset facility and compares the actual facility status with a maintenance expectation effect estimated from an asset facility state at a time of installation of the asset facility or previous inspection and maintenance, an operation knowledge database that stores operation knowledge of an operator, a maintenance process update function that extracts an operation change of the inspection and maintenance and updates the facilities information database, and a work order issuing function that issues the work order for the inspection and maintenance.Type: ApplicationFiled: March 9, 2016Publication date: October 6, 2016Inventors: Yasuyuki TADA, Kazuyasu ASAKURA, Satoru SHIMIZU, Hiromichi KONNO, Masahiro MURAKAMI, Kazutaka JOE
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Patent number: 8326589Abstract: In the present invention, in a case where a stable equilibrium point calculation is not calculable by using a Newton method, a damping factor of a mechanical system differential equation of a generator is set to be greater than an actual value of the generator of the power system. By applying pseudo-transient simulation to the nonlinear differential algebraic equation of the power system including the mechanical system differential equation of the generator, in which the damping factor is set, a norm of a mechanical system equation is found. If the found norm meets a predetermined condition, variable values of the power system at a time when the norm is found are set as initial values of the nonlinear differential algebraic equation of the power system. A stable equilibrium point is determined by applying the Newton method to the nonlinear differential algebraic equation in which the initial values are set.Type: GrantFiled: August 4, 2010Date of Patent: December 4, 2012Assignees: The Tokyo Electric Power Company, Incorporated, BIGWOOD SYSTEMS, IncorporatedInventors: Hsiao-Dong Chiang, Hua Li, Yasuyuki Tada, Ryuya Tanabe
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Publication number: 20100324872Abstract: In the present invention, in a case where a stable equilibrium point calculation is not calculable by using a Newton method, a damping factor of a mechanical system differential equation of a generator is set to be greater than an actual value of the generator of the power system. By applying pseudo-transient simulation to the nonlinear differential algebraic equation of the power system including the mechanical system differential equation of the generator, in which the damping factor is set, a norm of a mechanical system equation is found. If the found norm meets a predetermined condition, variable values of the power system at a time when the norm is found are set as initial values of the nonlinear differential algebraic equation of the power system. A stable equilibrium point is determined by applying the Newton method to the nonlinear differential algebraic equation in which the initial values are set.Type: ApplicationFiled: August 4, 2010Publication date: December 23, 2010Inventors: Hsiao-Dong CHIANG, Hua Li, Yasuyuki Tada, Ryuya Tanabe
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Patent number: 7761402Abstract: This invention relates to a method of determining stability of unstable equilibrium point (UEP) computed by using BCU method, comprising selecting UEP computed by using BCU method, obtaining a test vector Xtest for the selected UEP, say XUEP using the following equation: Xtest=Xspost+0.99(XUEP?Xspost) where Xspost is the SEP, and checking boundary condition of XUEP by simulating system trajectory of post-fault original system starting from Xtest.Type: GrantFiled: February 1, 2008Date of Patent: July 20, 2010Assignees: The Tokyo Electric Power Company, Incorporated, Bigwood Systems, IncorporatedInventors: Hsiao-Dong Chiang, Hua Li, Yasuyuki Tada, Tsuyoshi Takazawa, Takeshi Yamada, Atsushi Kurita, Kaoru Koyanagi
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Patent number: 7483826Abstract: This invention relates to a method of determining stability of unstable equilibrium point (UEP) computed by using BCU method, comprising selecting UEP computed by using BCU method, obtaining a test vector Xtest for the selected UEP, say XUEP using the following equation: Xtest=Xspost+0.99(XUEP?Xspost) where Xspost is the SEP, and checking boundary condition of XUEP by simulating system trajectory of post-fault original system starting from Xtest.Type: GrantFiled: February 9, 2005Date of Patent: January 27, 2009Assignees: The Tokyo Electric Power Company, Incorporated, Bigwood Systems, IncorporatedInventors: Hsiao-Dong Chiang, Hua Li, Yasuyuki Tada, Tsuyoshi Takazawa, Takeshi Yamada, Atsushi Kurita, Kaoru Koyanagi
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Publication number: 20080126060Abstract: This invention relates to a method of determining stability of unstable equilibrium point (UEP) computed by using BCU method, comprising selecting UEP computed by using BCU method, obtaining a test vector Xtest for the selected UEP, say XUEP using the following equation: Xtest=Xspost+0.99(XUEP?Xspost) where Xspost is the SEP, and checking boundary condition of XUEP by simulating system trajectory of post-fault original system starting from Xtest.Type: ApplicationFiled: February 1, 2008Publication date: May 29, 2008Applicant: The Tokyo Electric Power Co. Inc.Inventors: Hsiao-Dong CHIANG, Hua Li, Yasuyuki Tada, Tsuyoshi Takazawa, Takeshi Yamada, Atsushi Kurita, Kaoru Koyanagi
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Publication number: 20060190227Abstract: This invention relates to a method of determining stability of unstable equilibrium point (UEP) computed by using BCU method, comprising selecting UEP computed by using BCU method, obtaining a test vector Xtest for the selected UEP, say XUEP using the following equation: Xtest=Xspost+0.99(XUEP?Xspost) where Xspost is the SEP, and checking boundary condition of XUEP by simulating system trajectory of post-fault original system starting from Xtest.Type: ApplicationFiled: February 9, 2005Publication date: August 24, 2006Applicants: The Tokyo Electric Power Co. Inc., Bigwood Systems, IncorporatedInventors: Hsiao-Dong Chiang, Hua Li, Yasuyuki Tada, Tsuyoshi Takazawa, Takeshi Yamada, Atsushi Kurita, Kaoru Koyanagi
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Patent number: 6868311Abstract: A system for on-line dynamic screening of contingencies comprising postulated disturbances which an electric power system may experience, the system comprising a dynamic contingency screening program for evaluating a plurality of contingencies with a plurality of contingency classifiers based on the method of finding the controlling unstable equilibrium point of the power system known as the boundary of stability region based controlling unstable equilibrium point method by sequentially applying the contingencies to a network islanding problem classifier, S.E.Type: GrantFiled: April 22, 2003Date of Patent: March 15, 2005Assignees: The Tokyo Electric Power Company, IncorporatedInventors: Hsiao-Dong Chiang, Atsushi Kurita, Hiroshi Okamoto, Ryuya Tanabe, Yasuyuki Tada, Kaoru Koyanagi, Yicheng Zhou
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Publication number: 20030200010Abstract: A system for on-line dynamic screening of contingencies comprising postulated disturbances which an electric power system may experience, the system comprising a dynamic contingency screening program for evaluating a plurality of contingencies with a plurality of contingency classifiers based on the method of finding the controlling unstable equilibrium point of the power system known as the boundary of stability region based controlling unstable equilibrium point method by sequentially applying the contingencies to a network islanding problem classifier, S.E.Type: ApplicationFiled: April 22, 2003Publication date: October 23, 2003Inventors: Hsiao-Dong Chiang, Atsushi Kurita, Hiroshi Okamoto, Ryuya Tanabe, Yasuyuki Tada, Kaoru Koyanagi, Yicheng Zhou
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Patent number: 6625520Abstract: There is provided an available transfer capability calculating system for operating an electric power system, calculating optimal power flow with respect to assumption failure occurring in the electric power system and calculating available transfer capability of the electric power system based on the calculated value of the optimal power flow. The system has an optimal power flow calculating processor for deriving data associated with the initial phase angle and maximum electric power value of a generator by calculating mechanical output and electrical output of a generator including a generator phase angle defined by a time function in a condition that the generator phase angle does not exceed a preset value.Type: GrantFiled: May 31, 2000Date of Patent: September 23, 2003Assignees: The Tokyo Electric Power Company, IncorporatedInventors: Luonan Chen, Yasuyuki Tada, Hiroshi Okamoto, Ryuya Tanabe, Asako Ono
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Patent number: 4182036Abstract: This invention discloses an orthodontic unit disposition structure wherein a clinical area and a consultation area are provided in an adjacent relation with each other so as to carry out systematic and rational treatment and instruction from first to last whereby a patient can have his case initially diagnosed and then receive treatment and instruction, thus being enabled to undergo an effective operation.Type: GrantFiled: February 28, 1978Date of Patent: January 8, 1980Assignee: Kabushiki Kaisha Morita SeisakushoInventors: Yasuyuki Tada, Yutaka Ohta