Patents by Inventor Naohiro Kusumi
Naohiro Kusumi 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: 10358984Abstract: The gas turbine power generation system of the present invention repeats either the supply or absorption of power, in addition to generating power. A frequency converter for converting a frequency of power is connected between the rotating electrical machine and a power system via a power line, and a controller obtains a request for an output from the gas turbine power generation system and controls the combustor on the basis of the request. With respect to the frequency converter, the controller performs frequency converter control for changing the rotational speed of the rotating electrical machine on the basis of the request. The rotating electrical machine supplies or absorbs power in accordance with the change in the rotational speed. With respect to the speed adjustment mechanism, the controller performs speed adjustment mechanism control for setting the rotational speed to a reference value.Type: GrantFiled: December 18, 2014Date of Patent: July 23, 2019Assignee: Hitachi, Ltd.Inventors: Noriaki Hino, Naohiro Kusumi, Aung Ko Thet, Tomofumi Shiraishi, Masatoshi Yoshimura
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Patent number: 10263550Abstract: A gas turbine power generation system having an improved function to stabilize the power system is disclosed. The gas turbine power generation system has a dual-shaft gas turbine, an electric generator mechanically connected to a low pressure turbine of the dual-shaft gas turbine and electrically connected to an electric power system, a rotary electric machine mechanically connected to a high pressure turbine through a compressor of the dual-shaft gas turbine and electrically connected to the electric power system, wherein a power oscillation is suppressed by operation of the rotary electric machine as a motor or as a generator.Type: GrantFiled: December 19, 2014Date of Patent: April 16, 2019Assignee: Hitachi, Ltd.Inventors: Aung Ko Thet, Noriaki Hino, Naohiro Kusumi, Tomofumi Shiraishi, Masatoshi Yoshimura
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Patent number: 10202906Abstract: A two-shaft gas turbine having high operability is provided. The two-shaft gas turbine includes: a gas generator having a compressor, a combustor and a high pressure turbine; a power turbine having a low pressure turbine; a load connected to the power turbine; a motor/generator capable of rotatably driving the gas generator and capable of extracting power from the gas generator; electric equipment controlling the rotational driving and the power extraction by delivering electric power between the electric equipment and the motor/generator; and a control device controlling the electric equipment, wherein the combustor has a plurality of combustion regions to which a fuel is supplied through fuel adjustment means which are independent from each other, and the control device controls a delivery amount of the electric power delivered by the electric equipment corresponding to the number of combustion regions to which the fuel is supplied.Type: GrantFiled: January 15, 2014Date of Patent: February 12, 2019Assignee: Hitachi, Ltd.Inventors: Tetsuro Morisaki, Naohiro Kusumi, Noriaki Hino, Tomomichi Ito, Kazuo Takahashi
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Patent number: 10193383Abstract: The dual-shaft gas turbine power generation system includes: a high-pressure gas turbine; a first rotating shaft connecting a compressor and the high-pressure gas turbine; an electric motor connected to the first rotating shaft; a governor which adjusts the amount of air taken into the compressor; a low-pressure gas turbine; a second rotating shaft connected to the low-pressure gas turbine; a synchronous power generator connected to the second rotating shaft; a frequency converter which converts the frequency of power transmitted between the synchronous power generator and the electric motor; and a control device which controls a frequency converter control device for controlling the frequency converter, and the governor, on the basis of a power output command value indicating the power to be outputted to an external grid.Type: GrantFiled: November 4, 2016Date of Patent: January 29, 2019Assignee: Hitachi, Ltd.Inventors: Noriaki Hino, Naohiro Kusumi, Kazuo Takahashi, Tomomichi Ito
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Patent number: 10184406Abstract: A multi-shaft variable speed gas turbine apparatus includes a multi-shaft gas turbine having a gas turbine compressor, a gas turbine burner, a gas generator provided with a first turbine for rotationally driving the gas turbine compressor, and a power turbine, provided with a second turbine that is mechanically separated from the gas generator, rotationally driven by exhaust gas of the gas generator, and having a main generator. A sub-electric motor/generator is connected to the gas generator, and a frequency converter controls the sub-electric motor/generator. A fuel flow rate control valve adjusts output using a fuel flow rate to be injected into the gas turbine burner. Variation of the fuel flow rate is restricted, and a control device determines a drive load of the gas turbine compressor in accordance with an output load for a request load, and controls the sub-electric motor/generator using the frequency converter.Type: GrantFiled: June 18, 2014Date of Patent: January 22, 2019Assignee: Hitachi, Ltd.Inventors: Naohiro Kusumi, Noriaki Hino, Aung Ko Thet
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Patent number: 10094297Abstract: In order to enhance the tracking performance of power generation equipment with respect to a load variation and increase the reliability of the power generation equipment, a dynamic characteristic model simulating the dynamic characteristics of a multi-shaft gas turbine is used to calculate an output prediction value of a first power generator in a case where a combustor is controlled so as to match the output of the first power generator to an output target value; on the basis of the output target value and the output prediction value of the first power generator, a first power generator output instruction value as an instruction value for the output from the first power generator to a power system and a second power generator output instruction value as an instruction value for the output from a second power generator to the power system are calculated; and the combustor is controlled on the basis of the first power generator output instruction value and a frequency convertor is controlled on the basis of tType: GrantFiled: September 9, 2014Date of Patent: October 9, 2018Assignee: Hitachi, Ltd.Inventors: Naohiro Kusumi, Noriaki Hino, Aung Ko Thet, Tomofumi Shiraishi, Masatoshi Yoshimura
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Patent number: 10084405Abstract: A control device for power conversion device controls a power conversion device in a system driven by the power conversion device to which an electric motor outputs AC power, and includes: a control pulse generation unit configured to generate a control pulse of the power conversion device; and a negative phase creation unit configured to input a pulse signal output by the control pulse generation unit and rotational speed information of the electric motor, and to generate an inverted signal of an output signal of the control pulse generation unit, wherein the pulse signal of a half cycle during one cycle of voltage, the pulse signal being generated by the control pulse generation unit, and a pulse signal of a next half cycle during the one cycle of voltage, the pulse signal being generated by the negative phase creation unit, are symmetrical in positive and negative relationship of voltage.Type: GrantFiled: February 16, 2015Date of Patent: September 25, 2018Assignee: Hitachi, Ltd.Inventors: Masatoshi Yoshimura, Naohiro Kusumi, Noriaki Hino, Tomofumi Shiraishi, Aung Ko Thet
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Patent number: 9982555Abstract: A gas turbine power generation system has a dual-shaft gas turbine, an electric generator mechanically connected to a low pressure turbine of the dual-shaft gas turbine and electrically connected to an electric power system, a rotary electric machine mechanically connected to a high pressure turbine through a compressor of the dual-shaft gas turbine and electrically connected to the electric power system, and an electric power output from the electric generator side to the electric power system is adjusted by operation of the rotary electric machine as a motor or as a generator.Type: GrantFiled: March 14, 2014Date of Patent: May 29, 2018Assignee: Hitachi, Ltd.Inventors: Aung Ko Thet, Noriaki Hino, Naohiro Kusumi
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Patent number: 9935578Abstract: A control device of a power converter controls a system including a converter that converts alternating current (AC) power of a power supply into direct current (DC) power, an inverter that converts the DC power into AC power, a capacitor that is charged with and discharges the DC power, and a rotary electric machine that is driven by the AC power supplied from the inverter or regenerates the AC power to the power supply, the control device including: a vibration suppression control unit that outputs a torque current command correction value for canceling an axial vibration component due to a vibration frequency of a transmission system including the rotary electric machine and an output compensation control unit that outputs a correction value for suppressing AC power of the power supply fluctuated by the vibration suppression control unit to a voltage control unit of the converter.Type: GrantFiled: June 6, 2017Date of Patent: April 3, 2018Assignee: Hitachi, Ltd.Inventors: Masatoshi Yoshimura, Naohiro Kusumi, Noriaki Hino, Tomofumi Shiraishi, Aung Ko Thet
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Publication number: 20180026569Abstract: A control device for power conversion device controls a power conversion device in a system driven by the power conversion device to which an electric motor outputs AC power, and includes: a control pulse generation unit configured to generate a control pulse of the power conversion device; and a negative phase creation unit configured to input a pulse signal output by the control pulse generation unit and rotational speed information of the electric motor, and to generate an inverted signal of an output signal of the control pulse generation unit, wherein the pulse signal of a half cycle during one cycle of voltage, the pulse signal being generated by the control pulse generation unit, and a pulse signal of a next half cycle during the one cycle of voltage, the pulse signal being generated by the negative phase creation unit, are symmetrical in positive and negative relationship of voltage.Type: ApplicationFiled: February 16, 2015Publication date: January 25, 2018Applicant: HITACHI, LTD.Inventors: Masatoshi YOSHIMURA, Naohiro KUSUMI, Noriaki HINO, Tomofumi SHIRAISHI, Aung Ko Thet .
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Publication number: 20170363013Abstract: The gas turbine power generation system of the present invention repeats either the supply or absorption of power, in addition to generating power. The gas turbine power generation system is provided with a first rotation shaft, a compressor, a combustor, a first turbine upon which combustion gasses impinge, thereby causing the first turbine to rotate, and driving the first rotation shaft, a rotating electrical machine connected to the first rotation shaft, a speed adjustment mechanism for controlling the speed of the compressor by adjusting an air volume, a frequency converter for converting a frequency of power, the frequency converter being connected between the rotating electrical machine and a power system via a power line, and a controller for obtaining a request for an output from the gas turbine power generation system and controlling the combustor on the basis of the request.Type: ApplicationFiled: December 18, 2014Publication date: December 21, 2017Applicant: Hitachi, Ltd.Inventors: Noriaki HINO, Naohiro KUSUMI, Aung Ko THET, Tomofumi SHIRAISHI, Masatoshi YOSHIMURA
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Publication number: 20170359014Abstract: A control device of a power converter controls a system including a converter that converts alternating current (AC) power of a power supply into direct current (DC) power, an inverter that converts the DC power into AC power, a capacitor that is charged with and discharges the DC power, and a rotary electric machine that is driven by the AC power supplied from the inverter or regenerates the AC power to the power supply, the control device including: a vibration suppression control unit that outputs a torque current command correction value for canceling an axial vibration component due to a vibration frequency of a transmission system including the rotary electric machine and an output compensation control unit that outputs a correction value for suppressing AC power of the power supply fluctuated by the vibration suppression control unit to a voltage control unit of the converter.Type: ApplicationFiled: June 6, 2017Publication date: December 14, 2017Inventors: Masatoshi YOSHIMURA, Naohiro KUSUMI, Noriaki HINO, Tomofumi SHIRAISHI, Aung Ko THET
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Publication number: 20170346427Abstract: A gas turbine power generation system having an improved function to stabilize the power system is disclosed. The gas turbine power generation system has a dual-shaft gas turbine, an electric generator mechanically connected to a low pressure turbine of the dual-shaft gas turbine and electrically connected to an electric power system, a rotary electric machine mechanically connected to a high pressure turbine through a compressor of the dual-shaft gas turbine and electrically connected to the electric power system, wherein a power oscillation is suppressed by operation of the rotary electric machine as a motor or as a generator.Type: ApplicationFiled: December 19, 2014Publication date: November 30, 2017Inventors: Aung Ko THET, Noriaki HINO, Naohiro KUSUMI, Tomofumi SHIRAISHI, Masatoshi YOSHIMURA
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Publication number: 20170335773Abstract: This gas turbine power generation system includes: a two-shaft gas turbine; a power generator that is driven by the two-shaft gas turbine and that generates power; an electric motor that is driven by power generated by the power generator; and a frequency converter that converts a frequency of the power that is transmitted between the power generator and the electric motor. The frequency converter is disposed within a predetermined range near the electric motor at the side opposite to the two-shaft gas turbine side relative to the electric motor so as to face the plane perpendicular to a rotation shaft of the electric motor.Type: ApplicationFiled: December 15, 2014Publication date: November 23, 2017Inventors: Tomofumi SHIRAISHI, Naohiro KUSUMI, Noriaki HINO, Aung Ko THET, Masatoshi YOSHIMURA
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Publication number: 20170159577Abstract: A gas turbine combined electric power generation apparatus includes a gas turbine, a generator performing electric power generation with a driving force of the turbine, a first control device controlling an output of the gas turbine, a frequency converter converting a frequency of electric power supplied from the gas turbine to an external system, a second control device controlling torque of the gas turbine, an electric power supply device other than the gas turbine, a third control device controlling electric power supplied from the electric power supply device to the external system, and a fourth control device distributing an output command to the first control device, the second control device, and the third control device.Type: ApplicationFiled: May 30, 2014Publication date: June 8, 2017Inventors: Noriaki HINO, Aung Ko THET, Naohiro KUSUMI
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Publication number: 20170145925Abstract: In order to enhance the tracking performance of power generation equipment with respect to a load variation and increase the reliability of the power generation equipment, a dynamic characteristic model simulating the dynamic characteristics of a multi-shaft gas turbine is used to calculate an output prediction value of a first power generator in a case where a combustor is controlled so as to match the output of the first power generator to an output target value; on the basis of the output target value and the output prediction value of the first power generator, a first power generator output instruction value as an instruction value for the output from the first power generator to a power system and a second power generator output instruction value as an instruction value for the output from a second power generator to the power system are calculated; and the combustor is controlled on the basis of the first power generator output instruction value and a frequency convertor is controlled on the basis of tType: ApplicationFiled: September 9, 2014Publication date: May 25, 2017Inventors: Naohiro KUSUMI, Noriaki HINO, Aung Ko THET, Tomofumi SHIRAISHI, Masatoshi YOSHIMURA
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Publication number: 20170138272Abstract: A multi-shaft variable speed gas turbine apparatus includes: a multi-shaft gas turbine having a gas turbine compressor, a gas turbine burner, a gas generator provided with a first turbine for rotationally driving the gas turbine compressor, and a power turbine provided with a second turbine that is mechanically separated from the gas generator, and that is rotationally driven by exhaust gas of the gas generator, and with a main generator; a sub-electric motor/generator connected to the gas generator; a frequency converter that controls the sub-electric motor/generator; fuel flow rate control means for adjusting output by using a fuel flow rate to be injected into the gas turbine burner; restriction means for restricting variation of the fuel flow rate; and a control device that determines a drive load of the gas turbine compressor in accordance with an output load for a request load, and controls the sub-electric motor/generator by using the frequency converter.Type: ApplicationFiled: June 18, 2014Publication date: May 18, 2017Inventors: Naohiro KUSUMI, Noriaki HINO, Aung Ko THET
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Patent number: 9641034Abstract: A rotary machine includes two sets of three-phase stator winding wires and two sets of inverters connected to the same direct-current power supply. Alternating-current terminals of the inverters are respectively connected to the three-phase stator winding wires. Stator winding wires are housed in a plurality of slots to form a stator. The two sets of three-phase stator winding wires and the stator winding wires in the same phase of the sets are started to be wound from the slot positions, with phases thereof being different from each other by 180 degrees, among the plurality of slots and are finished being wound in the slot positions, with phases thereof different from each other by 180 degrees. Winding end points of the three-phase stator winding wires are respectively connected in common, and alternating-current voltages having the same magnitude and opposite phases are applied to the two sets of three-phase stator winding wire.Type: GrantFiled: October 9, 2013Date of Patent: May 2, 2017Assignee: Hitachi, Ltd.Inventors: Tomomichi Ito, Naohiro Kusumi, Noriaki Hino, Nobuhiro Kusuno, Aung Kothet
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Publication number: 20170077750Abstract: The dual-shaft gas turbine power generation system includes: a high-pressure gas turbine; a first rotating shaft connecting a compressor and the high-pressure gas turbine; an electric motor connected to the first rotating shaft; a governor which adjusts the amount of air taken into the compressor; a low-pressure gas turbine; a second rotating shaft connected to the low-pressure gas turbine; a synchronous power generator connected to the second rotating shaft; a frequency converter which converts the frequency of power transmitted between the synchronous power generator and the electric motor; and a control device which controls a frequency converter control device for controlling the frequency converter, and the governor, on the basis of a power output command value indicating the power to be outputted to an external grid.Type: ApplicationFiled: November 4, 2016Publication date: March 16, 2017Inventors: Noriaki HINO, Naohiro KUSUMI, Kazuo TAKAHASHI, Tomomichi ITO
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Patent number: 9520757Abstract: The dual-shaft gas turbine power generation system includes: a high-pressure gas turbine; a first rotating shaft connecting a compressor and the high-pressure gas turbine; an electric motor connected to the first rotating shaft; a governor which adjusts the amount of air taken into the compressor; a low-pressure gas turbine; a second rotating shaft connected to the low-pressure gas turbine; a synchronous power generator connected to the second rotating shaft; a frequency converter which converts the frequency of power transmitted between the synchronous power generator and the electric motor; and a control device which controls a frequency converter control device for controlling the frequency converter, and the governor, on the basis of a power output command value indicating the power to be outputted to an external grid.Type: GrantFiled: August 3, 2012Date of Patent: December 13, 2016Assignee: Hitachi, Ltd.Inventors: Noriaki Hino, Naohiro Kusumi, Kazuo Takahashi, Tomomichi Ito