Patents by Inventor Shinya Oohara
Shinya Oohara 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: 10243365Abstract: Conventionally, optimum introduction assistance for devices including a FACTS device and a storage adapted to changes in impedance and a transmission capacity involved in an increase of renewable energy power supplies has not been achieved. Therefore, in order to solve the problem, the present invention provides a power system equipment introduction assistance device that calculates an introduction point of power system equipment coupled to a power system, the introduction assistance device including a calculating unit configured to calculate, on the basis of predetermined system information and information concerning the power system equipment scheduled to be introduced, a characteristic of the power system affecting the power system during the introduction of the power system equipment and calculate the introduction point of the power system equipment from a predetermined evaluation index related to the characteristic of the power system.Type: GrantFiled: May 27, 2015Date of Patent: March 26, 2019Assignee: Hitachi, Ltd.Inventors: Efrain Eduardo Tamayo Ruiz, Shuji Katoh, Shinya Oohara, Shigenori Inoue, Tohru Yoshihara
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Publication number: 20180159329Abstract: Conventionally, optimum introduction assistance for devices including a FACTS device and a storage adapted to changes in impedance and a transmission capacity involved in an increase of renewable energy power supplies has not been achieved. Therefore, in order to solve the problem, the present invention provides a power system equipment introduction assistance device that calculates an introduction point of power system equipment coupled to a power system, the introduction assistance device including a calculating unit configured to calculate, on the basis of predetermined system information and information concerning the power system equipment scheduled to be introduced, a characteristic of the power system affecting the power system during the introduction of the power system equipment and calculate the introduction point of the power system equipment from a predetermined evaluation index related to the characteristic of the power system.Type: ApplicationFiled: May 27, 2015Publication date: June 7, 2018Inventors: Efrain Eduardo TAMAYO RUIZ, Shuji KATOH, Shinya OOHARA, Shigenori INOUE, Tohru YOSHIHARA
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Patent number: 8575886Abstract: A power storage apparatus is installed in connection with a power generation system using natural energy generation power. The power storage apparatus is comprised of a control unit and a plurality of electricity storage devices. The control unit is structured to calculate a target value of power station output, to calculate a charge and discharge power instruction of each of the plurality of electricity storage devices, and to instruct the charge and discharge. The control unit calculates a correction value of the charge and discharge power to be charged and discharged by the power storage apparatus to permit the charge rate of the plurality of secondary batteries to follow an individual charge rate target value.Type: GrantFiled: September 10, 2009Date of Patent: November 5, 2013Assignee: Hitachi Engineering & Services Co., Ltd.Inventors: Shinya Oohara, Naoki Hoshino, Masaki Rikitake
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Patent number: 8334606Abstract: A wind power generation system having a group of wind turbine generators includes a superior controller having a generation power recording memory to record a sum of a generation power of the group of wind turbine generators and a charge and discharge power of a power storage system, a charge and discharge power command computing device for computing a charge and discharge power command for the power storage system in a second period by making use of information of the output power in a first period computed in the output power computing unit and information of a detection value at the present of the generation power recording memory, and a charge and discharge power control device.Type: GrantFiled: August 12, 2009Date of Patent: December 18, 2012Assignee: Hitachi Engineering & Services Co., Ltd.Inventors: Shinya Oohara, Naoki Hoshino, Takeshi Iwata
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Patent number: 8116914Abstract: A pitch controller, uninterruptible power supply, and rotational speed detector are disposed in the rotor in a wind turbine. When a slip ring failure or wire breakage occurs, the pitch controller internally creates a pitch angle command so as to control the pitch angle.Type: GrantFiled: August 20, 2007Date of Patent: February 14, 2012Assignees: Hitachi, Ltd., Fuji Heavy Industries Ltd.Inventors: Shinya Oohara, Masaya Ichinose, Motoo Futami, Kazuya Tsutsumi, Takashi Shiraishi, Shigeo Yoshida, Hajime Komiyama, Junichi Sugino
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Patent number: 8093740Abstract: A wind power generation system wherein procedure for controlling the blade pitch is changed in accordance with the rate of decrease in the amplitude of the grid voltage, and when over current occurs in the grid-side power converter, the grid-side power converter is brought into the gate-blocked condition whereas the generator-side power converter continues its operation.Type: GrantFiled: July 1, 2009Date of Patent: January 10, 2012Assignee: Hitachi, Ltd.Inventors: Shinya Oohara, Masaya Ichinose, Motoo Futami, Tadashi Sodeyama
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Publication number: 20110193516Abstract: A power storage apparatus installed in connection with a power generation system using natural energy generation power. The power storage apparatus is composed of a control unit and a plurality of electricity storage devices. The control unit is structured so as to calculate a target value of power station output, calculate a charge and discharge power instruction of each of the plurality of electricity storage devices, and instruct the charge and discharge. The control unit calculates a correction value of the charge and discharge power to be charged and discharged by the power storage apparatus so as to permit the charge rate of the plurality of secondary batteries to follow an individual charge rate target value according to the characteristics or operation history of the plurality of secondary batteries. This enables control of the charge and discharge of the plurality of electricity storage devices.Type: ApplicationFiled: September 10, 2009Publication date: August 11, 2011Applicant: HITACHI ENGINEERING & SERVICES CO., LTD.Inventors: Shinya Oohara, Naoki Hoshino, Masaki Rikitake
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Publication number: 20110187109Abstract: A power system control apparatus which controls a power system electrically connected to a wind power generation apparatus having a wind turbine which receives wind and rotates, a generator which generates electric power by the rotating wind turbine, and a power converter which converts the electric power generated by the generator. The power system control apparatus includes a voltage detector for detecting a voltage of the power system, a reactive power command value generation unit for generating a reactive power command value from a voltage detection value of the voltage detector, and a transmission unit for transmitting the reactive power command value to the wind power generation apparatus. Output fluctuation of the generator is suppressed, and reactive power according to the reactive power command value is transmitted from the wind power generation apparatus to the power system.Type: ApplicationFiled: April 13, 2011Publication date: August 4, 2011Inventors: Masaya Ichinose, Shinya Oohara, Motoo Futami
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Patent number: 7952214Abstract: A wind power generation system temporarily stops a power converter when a system disturbance occurs, and reactivates the power converter after detecting a solution of the problem of an influence (overcurrent of a stator, direct current component of a stator, overcurrent of a rotor, etc.) of a fault occurring in a doubly-fed generator during a system fault. During a system fault, a reactive current can be safely output from a doubly-fed generator to an electric power system without destroying equipment of the wind power generation system.Type: GrantFiled: May 28, 2008Date of Patent: May 31, 2011Assignee: Hitachi, Ltd.Inventors: Masaya Ichinose, Shinya Oohara, Motoo Futami, Mitsugu Matsutake, Hiromitsu Sakai
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Patent number: 7948217Abstract: A distributed generation system that can suppress a voltage fluctuation caused by a distributed generation by an apparatus of a small power capacity in the distributed generation itself and stabilize the power system voltage without inserting interharmonic voltage or current into the power system and without interference among a plurality of distributed generations. Parameter ?(t) varying with time is estimated based on fluctuating component ?P of the active power P generated by the distributed generation and the voltage fluctuating component ?V attributable to the distributed generation developed at the point of connection between the distributed generation and power system. The distributed generation produces reactive power Q=??P or Q=???P, to thereby suppresses only the voltage fluctuation of the power system attributable to the distributed generation.Type: GrantFiled: January 22, 2010Date of Patent: May 24, 2011Assignee: Hitachi, Ltd.Inventors: Shinya Oohara, Masaya Ichinose, Motoo Futami, Mitsugu Matsutake, Shoji Fukuda
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Patent number: 7733066Abstract: A power generation apparatus and method includes an AC energization synchronous generator, a switching device which connects to a network disposed on a stator side of the AC energization synchronous generator, an energizing device which applies a variable frequency AC to a secondary winding of the AC energization synchronous generator, and a first voltage detection unit which detects a voltage of the switching device on the stator side. A rotational frequency of the AC energization synchronous generator is estimated or calculated based on a frequency of a stator side voltage of the switching device, while the switching device is open.Type: GrantFiled: November 13, 2008Date of Patent: June 8, 2010Assignee: Hitachi, Ltd.Inventors: Masaya Ichinose, Motoo Futami, Shinya Oohara, Kazuhiro Imaie, Mitsugu Matsutake
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Patent number: 7728451Abstract: A wind power generation system includes: a wind turbine in which at least one blade is mounted on an axis; a generator for generating multiphase alternating current power by rotation of the axis; and a multiphase power conversion device for performing PWM-control for adjustment and output of generated power of the generator. With the configuration, the PWM-control provides for each phase a control paused period in which no overlap occurs. Thus, the pulse density between the control period and the control paused period of other phases is low, thereby generating high and low density in an inter-phase pulse.Type: GrantFiled: December 12, 2007Date of Patent: June 1, 2010Assignee: Hitachi, Ltd.Inventors: Masaya Ichinose, Shinya Oohara, Motoo Futami, Mitsugu Matsutake
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Publication number: 20100117606Abstract: A distributed generation system that can suppress a voltage fluctuation caused by a distributed generation by an apparatus of a small power capacity in the distributed generation itself and stabilize the power system voltage without inserting interharmonic voltage or current into the power system and without interference among a plurality of distributed generations. Parameter ?(t) varying with time is estimated based on fluctuating component ?P of the active power P generated by the distributed generation and the voltage fluctuating component ?V attributable to the distributed generation developed at the point of connection between the distributed generation and power system. The distributed generation produces reactive power Q=??P or Q=???P, to thereby suppresses only the voltage fluctuation of the power system attributable to the distributed generation.Type: ApplicationFiled: January 22, 2010Publication date: May 13, 2010Applicant: Hitachi, Ltd.Inventors: Shinya Oohara, Masaya Ichinose, Motoo Futami, Mitsugu Matsutake, Shoji Fukuda
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Publication number: 20100102560Abstract: A power system control apparatus which controls a power system electrically connected to a wind power generation apparatus having a wind turbine which receives wind and rotates, a generator which generates electric power by the rotating wind turbine, and a power converter which converts the electric power generated by the generator. The power system control apparatus includes a voltage detector for detecting a voltage of the power system, a reactive power command value generation unit for generating a reactive power command value from a voltage detection value of the voltage detector, and a transmission unit for transmitting the reactive power command value to the wind power generation apparatus. Output fluctuation of the generator is suppressed, and reactive power according to the reactive power command value is transmitted from the wind power generation apparatus to the power system.Type: ApplicationFiled: December 29, 2009Publication date: April 29, 2010Inventors: Masaya ICHINOSE, Shinya OOHARA, Motoo FUTAMI
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Patent number: 7667343Abstract: A wind turbine-driven hydrogen production system controlling a power converter system such that the wind turbine stays in its operable range for a longer time and thus the hydrogen production system produces hydrogen for a longer time. The wind turbine-driven hydrogen production system varies an amount of electrical current supplied to an electrolytic hydrogen production system according to the rotational speed of the wind turbine to reduce variations in the rotational speed. Furthermore, the pitch angle of the wind turbine varies according to the speed. Thus, variations in the speed of the wind turbine can be reduced. A permanent-magnet generator is used as the electricity generator of the wind turbine to obtain a power supply at start-up. Alternatively, a power storage system used as assistive equipment at start-up is supplementarily added or only a power supply for the controllers is supplied from a system.Type: GrantFiled: January 18, 2007Date of Patent: February 23, 2010Assignee: Hitachi, Ltd.Inventors: Shinya Oohara, Masaya Ichinose, Motoo Futami, Mitsugu Matsutake, Kazumi Fujii, Kazumasa Ide, Takeyuki Itabashi, Junji Tamura
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Patent number: 7663348Abstract: A distributed generation system that can suppress a voltage fluctuation caused by a distributed generation by an apparatus of a small power capacity in the distributed generation itself and stabilize the power system voltage without inserting interharmonic voltage or current into the power system and without interference among a plurality of distributed generations. Parameter ?(t) varying with time is estimated based on fluctuating component ?P of the active power P generated by the distributed generation and the voltage fluctuating component ?V attributable to the distributed generation developed at the point of connection between the distributed generation and power system. The distributed generation produces reactive power Q=??P or Q=???P, to thereby suppresses only the voltage fluctuation of the power system attributable to the distributed generation.Type: GrantFiled: October 26, 2006Date of Patent: February 16, 2010Assignee: Hitachi, Ltd.Inventors: Shinya Oohara, Masaya Ichinose, Motoo Futami, Mitsugu Matsutake, Shoji Fukuda
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Patent number: 7659637Abstract: A variable speed wind power generation system including a wind turbine, a generation power command unit for generating a generation power command value based on a state quantity of the wind turbine and a generator control unit for controlling the power converter for controlling electric power of the generator, wherein the generator control unit operates to regulate the generation power of the generator in order to change the generation power amount according to the generation power command value.Type: GrantFiled: June 28, 2007Date of Patent: February 9, 2010Assignee: Hitachi, Ltd.Inventors: Masaya Ichinose, Shinya Oohara, Motoo Futami, Tadashi Sodeyama, Kazuhiro Imaie
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Patent number: 7642666Abstract: An interface device transmits a reactive power command depending on a power system from a voltage regulation device of the power system to a wind power generation apparatus electrically connected to the power system, and the wind power generation apparatus receives the reactive power command. Then, the wind power generation apparatus outputs reactive power according to a value obtained by adding, to a reactive power command, another reactive power command for suppression of voltage fluctuation caused by output power of the wind power generation apparatus.Type: GrantFiled: May 22, 2007Date of Patent: January 5, 2010Assignee: Hitachi, Ltd.Inventors: Masaya Ichinose, Shinya Oohara, Motoo Futami
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Publication number: 20090295162Abstract: A wind power generation system having a group of wind turbine generators includes a superior controller having a generation power recording memory to record a sum of a generation power of the group of wind turbine generators and a charge and discharge power of a power storage system, a charge and discharge power command computing device for computing a charge and discharge power command for the power storage system in a second period by making use of information of the output power in a first period computed in the output power computing unit and information of a detection value at the present of the generation power recording memory, and a charge and discharge power control device.Type: ApplicationFiled: August 12, 2009Publication date: December 3, 2009Applicant: HITACHI ENGINEERING & SERVICES CO., LTD.Inventors: Shinya Oohara, Naoki Hoshino, Takeshi Iwata
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Publication number: 20090261589Abstract: A wind power generation system wherein procedure for controlling the blade pitch is changed in accordance with the rate of decrease in the amplitude of the grid voltage, and when over current occurs in the grid-side power converter, the grid-side power converter is brought into the gate-blocked condition whereas the generator-side power converter continues its operation.Type: ApplicationFiled: July 1, 2009Publication date: October 22, 2009Inventors: Shinya Oohara, Masaya Ichinose, Motoo Futami, Tadashi Sodeyama