Patents by Inventor Toru JINTSUGAWA
Toru JINTSUGAWA 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: 9768616Abstract: A resonance suppression device configured to supply compensation current to a power system from a power conversion device connected to the power system, to suppress resonance which occurs with a power facility being connected to the power system, the resonance suppression device includes: a transfer function that is to be multiplied to a value based on voltage of the power system; a filter configured to extract a frequency component obtained by eliminating a fundamental wave component from frequency components contained in the inputted voltage, to output the resultant; and a coefficient control unit configured to control a coefficient of the transfer function so that a value of the compensation current falls within a predetermined range, according to output capacity of the power conversion device, wherein including a current command value generation unit being configured to generate as a current command value with respect to the power conversion device an output value obtained by inputting in the filter a valType: GrantFiled: March 2, 2017Date of Patent: September 19, 2017Assignee: FUJI ELECTRIC CO., LTD.Inventors: Kenya Murakami, Toru Jintsugawa, Tomohiro Koike, Kentaro Kofuji
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Publication number: 20170179718Abstract: A resonance suppression device configured to supply compensation current to a power system from a power conversion device connected to the power system, to suppress resonance which occurs with a power facility being connected to the power system, the resonance suppression device includes: a transfer function that is to be multiplied to a value based on voltage of the power system; a filter configured to extract a frequency component obtained by eliminating a fundamental wave component from frequency components contained in the inputted voltage, to output the resultant; and a coefficient control unit configured to control a coefficient of the transfer function so that a value of the compensation current falls within a predetermined range, according to output capacity of the power conversion device, wherein including a current command value generation unit being configured to generate as a current command value with respect to the power conversion device an output value obtained by inputting in the filter a valType: ApplicationFiled: March 2, 2017Publication date: June 22, 2017Applicant: FUJI ELECTRIC CO., LTD.Inventors: Kenya Murakami, Toru Jintsugawa, Tomohiro Koike, Kentaro Kofuji
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Patent number: 9621023Abstract: The present invention whose object is to reduce compensation current at the time when suppressing harmonic distortion caused by harmonic voltage, to reduce capacitance of an inverter, a resonance suppression device configured to suppress resonance which occurs when a power facility such as a wind power generator is connected to a power system includes: an inverter configured to supply alternating current to the power system, the inverter being in parallel with the power facility; a current command value generation unit in which voltage at a connection point between the power facility and the power system is inputted thereto and a current command value is obtained by multiplying, by a transfer function, a harmonic component contained in the voltage at the connection point; and a current control unit configured to control the alternating current outputted from the inverter based on the current command value.Type: GrantFiled: April 21, 2014Date of Patent: April 11, 2017Assignee: FUJI ELECTRIC CO., LTD.Inventors: Kenya Murakami, Toru Jintsugawa, Tomohiro Koike, Kentaro Kofuji
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Patent number: 9590485Abstract: A resonance suppression device, in which power loss and apparatus capacitance are reduced by outputting a compensating current only while a voltage resonance is being generated, and which suppresses resonance generated by connection of a power apparatus to a power system. In one embodiment, the device includes a capacitance change detector that detects a change of an electrostatic capacitance (impedance) connected to the power system. When the resonance detector detects the resonance, a current command value generator generates the current command value on the basis of harmonic components included in a current supplied from the power apparatus to the power system. When the impedance change detector detects a change of the impedance, the current command value generator generates the current command value so as to reduce the compensating current.Type: GrantFiled: September 10, 2015Date of Patent: March 7, 2017Assignee: FUJI ELECTRIC CO., LTD.Inventors: Toru Jintsugawa, Kenya Murakami
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Publication number: 20160028301Abstract: The present invention whose object is to reduce compensation current at the time when suppressing harmonic distortion caused by harmonic voltage, to reduce capacitance of an inverter, a resonance suppression device configured to suppress resonance which occurs when a power facility such as a wind power generator is connected to a power system includes: an inverter configured to supply alternating current to the power system, the inverter being in parallel with the power facility; a current command value generation unit in which voltage at a connection point between the power facility and the power system is inputted thereto and a current command value is obtained by multiplying, by a transfer function, a harmonic component contained in the voltage at the connection point; and a current control unit configured to control the alternating current outputted from the inverter based on the current command value.Type: ApplicationFiled: April 21, 2014Publication date: January 28, 2016Applicant: FUJI ELECTRIC CO., LTD.Inventors: Kenya Murakami, Toru Jintsugawa, Tomohiro Koike, Kentaro Kofuji
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Publication number: 20150381027Abstract: A resonance suppression device, in which power loss and apparatus capacitance are reduced by outputting a compensating current only while a voltage resonance is being generated, and which suppresses resonance generated by connection of a power apparatus to a power system. In one embodiment, the device includes a capacitance change detector that detects a change of an electrostatic capacitance (impedance) connected to the power system. When the resonance detector detects the resonance, a current command value generator generates the current command value on the basis of harmonic components included in a current supplied from the power apparatus to the power system. When the impedance change detector detects a change of the impedance, the current command value generator generates the current command value so as to reduce the compensating current.Type: ApplicationFiled: September 10, 2015Publication date: December 31, 2015Applicant: FUJI ELECTRIC CO., LTD.Inventors: Toru JINTSUGAWA, Kenya MURAKAMI