Patents by Inventor Tsukasa Onishi
Tsukasa Onishi 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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Patent number: 9787094Abstract: A power demand regulation system has a power demand regulation device that regulates the load applied to equipment of an electrical power system by a load apparatus operating by means of power from the electrical power system, which supplies power to consumers. When regulating the load to the equipment, the power demand regulation device selects a load apparatus as the subject of a request for an alteration of operating state on the basis of by-apparatus load information, which is information of each load apparatus, and a regulation target value, which is the amount of load that is to be regulated, and, in the period from the start to the end of regulation, executes a plurality of times the outputting of an alteration request that requests the alteration of the operating state of the selected load apparatus.Type: GrantFiled: November 28, 2012Date of Patent: October 10, 2017Assignee: Hitachi, Ltd.Inventors: Hirotaka Takahashi, Yasushi Tomita, Ikuma Sugamata, Akira Kobayashi, Tsukasa Onishi, Takafumi Ebara
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Patent number: 9774216Abstract: To control a power state of a power system properly according to a communication state. A system for controlling a power system includes a plurality of sensor devices configured to output measurement data; a first control apparatus configured to estimate a first power state of the power system by using the measurement data obtained by the plurality of sensor devices, calculate a first controlled variable according to the estimated first power state, and output the calculated first controlled variable; and at least a second control apparatus configured to execute a predetermined control operation according to either the first controlled variable calculated in the first control apparatus, or a second controlled apparatus calculated in the second control apparatus. When it is not able to obtain part of the measurement data, the first control apparatus estimates the first power state by using predetermined measurement data among the obtained measurement data.Type: GrantFiled: July 10, 2012Date of Patent: September 26, 2017Assignee: Hitachi, Ltd.Inventors: Kenichiro Yamane, Kunihiko Tsunedomi, Noriyuki Uchiyama, Yasushi Tomita, Tsukasa Onishi, Masatoshi Kumagai
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Patent number: 9478986Abstract: A load leveling system and a method for a power system are capable of attaining load leveling in a distribution substation unit. The load leveling system is for a power system with a controller having a major customer and lower transforming apparatus, and with a customer connected to the lower transforming apparatus via a low-voltage line. The system also has a communication unit between the customer and its own system, and control use time zones of devices within the customer, as well as an electric demand prediction unit, and a first load leveling processing unit. By employing such a system, it becomes possible to provide a load leveling system for a power system that is capable of realizing load leveling of both a distribution substation unit and a pole transformer unit.Type: GrantFiled: August 17, 2012Date of Patent: October 25, 2016Assignees: Hitachi, Ltd., Tohoku Electric Power Co., Inc.Inventors: Hirotaka Takahashi, Yasushi Tomita, Takashi Oda, Eri Isozaki, Tsukasa Onishi, Kazuhiro Horikoshi, Katsuhiro Matsuda
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Publication number: 20150142187Abstract: To control a power state of a power system properly according to a communication state. A system for controlling a power system includes a plurality of sensor devices configured to output measurement data; a first control apparatus configured to estimate a first power state of the power system by using the measurement data obtained by the plurality of sensor devices, calculate a first controlled variable according to the estimated first power state, and output the calculated first controlled variable; and at least a second control apparatus configured to execute a predetermined control operation according to either the first controlled variable calculated in the first control apparatus, or a second controlled apparatus calculated in the second control apparatus. When it is not able to obtain part of the measurement data, the first control apparatus estimates the first power state by using predetermined measurement data among the obtained measurement data.Type: ApplicationFiled: July 10, 2012Publication date: May 21, 2015Applicant: HITACHI, LTD.Inventors: Kenichiro Yamane, Kunihiko Tsunedomi, Noriyuki Uchiyama, Yasushi Tomita, Tsukasa Onishi, Masatoshi Kumagai
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Patent number: 9001480Abstract: A distributed energy resources control apparatus for controlling power from a distributed energy resource in a system section separable from a power system includes a detecting unit, a receiving unit, and a control unit. The detecting unit detects a fault of the power system. The receiving unit receives a signal indicating authorization for the distributed energy resource to perform independent operation as linking with the system section, when the system section is separated from the power system. The control unit controls a power converter converting power from the distributed energy resource and outputting to the system section, based on measurement results of a voltage and a frequency of the system section, when the fault is detected and the signal is received.Type: GrantFiled: February 19, 2013Date of Patent: April 7, 2015Assignee: Hitachi, Ltd.Inventors: Yasuo Sato, Takafumi Ebara, Masahiro Watanabe, Tsukasa Onishi
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Publication number: 20140327309Abstract: A power demand regulation system has a power demand regulation device that regulates the load applied to equipment of an electrical power system by a load apparatus operating by means of power from the electrical power system, which supplies power to consumers. When regulating the load to the equipment, the power demand regulation device selects a load apparatus as the subject of a request for an alteration of operating state on the basis of by-apparatus load information, which is information of each load apparatus, and a regulation target value, which is the amount of load that is to be regulated, and, in the period from the start to the end of regulation, executes a plurality of times the outputting of an alteration request that requests the alteration of the operating state of the selected load apparatus.Type: ApplicationFiled: November 28, 2012Publication date: November 6, 2014Inventors: Hirotaka Takahashi, Yasushi Tomita, Ikuma Sugamata, Akira Kobayashi, Tsukasa Onishi, Takafumi Ebara
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Publication number: 20130258730Abstract: A distributed energy resources control apparatus for controlling power from a distributed energy resource in a system section separable from a power system includes a detecting unit, a receiving unit, and a control unit. The detecting unit detects a fault of the power system. The receiving unit receives a signal indicating authorization for the distributed energy resource to perform independent operation as linking with the system section, when the system section is separated from the power system. The control unit controls a power converter converting power from the distributed energy resource and outputting to the system section, based on measurement results of a voltage and a frequency of the system section, when the fault is detected and the signal is received.Type: ApplicationFiled: February 19, 2013Publication date: October 3, 2013Applicant: HITACHI, LTD.Inventors: Yasuo SATO, Takafumi EBARA, Masahiro WATANABE, Tsukasa ONISHI
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Publication number: 20130054040Abstract: It is an object of the present invention to provide a load leveling system of a power system capable of attaining load leveling in a distribution substation unit and a method thereof. Disclosed is a load leveling system of a power system with a controller having a major customer and lower transforming apparatus, and with a customer connected to the lower transforming apparatus via a low-voltage line. The system also has a communication unit between the customer and its own system, and control use time zones of devices within the customer; an electric demand prediction unit, and a first load leveling processing unit. By employing such an arranged system, it becomes possible to provide a load leveling system of a power system capable of realizing load leveling of both a distribution substation unit and a pole transformer unit.Type: ApplicationFiled: August 17, 2012Publication date: February 28, 2013Applicants: Tohoku Electric Power Co., Inc., Hitachi, Ltd.Inventors: Hirotaka Takahashi, Yasushi Tomita, Takashi Oda, Eri Isozaki, Tsukasa Onishi, Kazuhiro Horikoshi, Katsuhiro Matsuda
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Patent number: 6571152Abstract: One of a plurality of switches constituting a power system is set as a perceived switch, and n optional switches Bk (k=1 to n) in the on state among the other switches are changed to the off state, and n loop networks including the perceived switch are created, and each switch Ck (k=1 to n) constituting the loop networks is changed from the off state to the on state so as to create a plurality of network configuration candidates, and a power network configuration is decided on the basis of the plurality of network configuration candidates.Type: GrantFiled: November 15, 2000Date of Patent: May 27, 2003Assignee: Hitachi, Ltd.Inventors: Toshiyuki Sawa, Toshiyuki Furukawa, Tsukasa Onishi
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Patent number: 6181984Abstract: One of a plurality of switches constituting a power system is set as a perceived switch, and n optional switches Bk (k=1 to n) in the on state among the other switches are changed to the off state, and n loop networks including the perceived switch are created, and each switch Ck (k=1 to n) constituting the loop networks is changed from the off state to the on state so as to create a plurality of network configuration candidates, and a power network configuration is decided on the basis of the plurality of network configuration candidates.Type: GrantFiled: February 20, 1998Date of Patent: January 30, 2001Assignee: Hitachi, Ltd.Inventors: Toshiyuki Sawa, Toshiyuki Furukawa, Tsukasa Onishi