Patents by Inventor Shuichi Ushiki
Shuichi Ushiki 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: 9712075Abstract: A method of controlling a single-phase voltage source AC/DC converting circuit has internal equivalent impedance as seen from an AC terminal, for converting power from a DC voltage source connected to a DC terminal to single-phase AC power or for converting single-phase AC power from a single-phase AC source connected to the AC terminal to DC power in accordance with a pulse width of a gate signal generated based on a PWM command.Type: GrantFiled: August 21, 2013Date of Patent: July 18, 2017Assignee: ORIGIN ELECTRIC COMPANY, LIMITEDInventors: Masaaki Ohshima, Shuichi Ushiki, Jinbin Zhao
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Patent number: 9154050Abstract: A static synchronous compensator that generates a second axis voltage command from the difference between the DC voltage converted by a single-phase voltage AC-DC conversion circuit and a set DC voltage command. When the voltage (the voltage of an AC terminal) of the single-phase AC power system increases, since the difference between the voltage of the AC terminal and an internal electromotive force increases, the static synchronous compensator carries out a PWM control to decreases the voltage of the AC terminal side of the single-phase voltage AC-DC conversion circuit. Since the voltage of the single-phase voltage AC-DC conversion circuit becomes lower than the voltage of the single-phase AC power system, an ineffective current flows from single-phase AC power system in the static synchronous compensator so that the voltage of the single-phase AC power system can be decreased.Type: GrantFiled: August 13, 2013Date of Patent: October 6, 2015Assignee: ORIGIN ELECTRIC COMPANY, LIMITEDInventors: Shuichi Ushiki, Masaaki Ohshima
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Publication number: 20150162847Abstract: A static synchronous compensator that generates a second axis voltage command from the difference between the DC voltage converted by a single-phase voltage AC-DC conversion circuit and a set DC voltage command. When the voltage (the voltage of an AC terminal) of the single-phase AC power system increases, since the difference between the voltage of the AC terminal and an internal electromotive force increases, the static synchronous compensator carries out a PWM control to decreases the voltage of the AC terminal side of the single-phase voltage AC-DC conversion circuit. Since the voltage of the single-phase voltage AC-DC conversion circuit becomes lower than the voltage of the single-phase AC power system, an ineffective current flows from single-phase AC power system in the static synchronous compensator so that the voltage of the single-phase AC power system can be decreased.Type: ApplicationFiled: August 13, 2013Publication date: June 11, 2015Inventors: Shuichi Ushiki, Masaaki Ohshima
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Publication number: 20150145328Abstract: A distributed power system is designed to continuously supply electric power to a load even when a system voltage of the electric power system becomes abnormal. The distributed power system includes a DC/DC converter to convert DC current generated by solar power generation facility to DC current with a predetermined output voltage, and an inverter to convert the DC current to an AC current which is output to an electric power system via a system interconnect switch. When the system voltage of the electric power system is abnormal, a control device makes the system interconnect switch open to switch operation modes of the DC/DC converter and inverter to a self-sustaining operation without stopping, and supplies electric power to a load connected between the inverter and the system interconnect switch.Type: ApplicationFiled: July 22, 2013Publication date: May 28, 2015Inventors: Masaaki Ohshima, Shuichi Ushiki
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Patent number: 8848406Abstract: A method and a single-phase voltage type AC/DC converting device and a three-phase voltage type AC/DC converting device arranged between a load and a distribution network. The converting devices are capable of contributing to stabilize a system frequency and a system voltage. By applying an autonomous parallel operation control technique of an AC/DC converter to a load, which receives power from a distribution network, drooping characteristics (governor-free characteristics) for a frequency of active power and voltage-maintaining characteristics (V-Q characteristics) may be obtained. The governor-free characteristics automatically decrease and increase received power when the system frequency decreases and increases, so that even the load may contribute to stabilize the system frequency. The V-Q characteristics generates/absorbs reactive power so as to maintain a voltage at a receiving end constant regardless of load power to further stabilize the system voltage.Type: GrantFiled: July 25, 2011Date of Patent: September 30, 2014Assignee: Origin Electric Company, LimitedInventors: Masaaki Ohshima, Shuichi Ushiki, Yasuhiro Genjima, Kiyomi Watanabe
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Publication number: 20130336032Abstract: A method of controlling a single-phase voltage source AC/DC converting circuit has internal equivalent impedance as seen from an AC terminal, for converting power from a DC voltage source connected to a DC terminal to single-phase AC power or for converting single-phase AC power from a single-phase AC source connected to the AC terminal to DC power in accordance with a pulse width of a gate signal generated based on a PWM command.Type: ApplicationFiled: August 21, 2013Publication date: December 19, 2013Applicant: Origin Electric Company, LtdInventors: Masaaki OHSHIMA, Shuichi USHIKI, Jinbin ZHAO
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Publication number: 20130294127Abstract: A single-phase voltage source DC-AC power converter includes (a) a single-phase voltage source DC-AC power converting circuit having a gate signal generator that detects a single-phase AC output current at an AC terminal and that generates gate signals for making values of a PWM command and the single-phase AC output current identical, and (b) target current producing means that produces the PWM command such that a DC component included in the single-phase AC output voltage at the AC terminal becomes zero.Type: ApplicationFiled: July 1, 2013Publication date: November 7, 2013Inventors: Masaaki OHSHIMA, Shuichi USHIKI, Jinbin ZHAO, Hirokazu SHIMIZU
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Patent number: 8553436Abstract: An automatic synchronous parallelization apparatus capable of suppressing an inrush current by automatically adjusting the magnitude, the frequency, and the phase of the voltage when a single-phase voltage-type DC-to-AC converting device performing an autonomous parallel operation is connected in parallel with an external single-phase AC voltage source. The automatic synchronous parallelization apparatus includes a synchronization detecting circuit, a voltage amplitude command value generating circuit, and a frequency command value generating circuit.Type: GrantFiled: January 14, 2011Date of Patent: October 8, 2013Assignee: Origin Electric Company, LimitedInventors: Masaaki Ohshima, Shuichi Ushiki, Jinbin Zhao
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Patent number: 8542511Abstract: A single-phase voltage source AC/DC converter according to the present invention generates a second axis voltage command from difference between a DC voltage detection value at a DC terminal and a DC voltage command value and controls a DC voltage by increasing and decreasing active power with the second axis voltage command. For example, the voltage at the DC terminal is increased by decreasing active power when the DC voltage detection value at the DC terminal is lower than the DC voltage command, while the DC voltage detection value at the DC terminal is decreased by increasing the active power when the DC voltage detection value at the DC terminal is higher than the DC voltage command.Type: GrantFiled: December 19, 2011Date of Patent: September 24, 2013Assignee: Origin Electric Company, LimitedInventors: Masaaki Ohshima, Shuichi Ushiki, Jinbin Zhao
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Patent number: 8503206Abstract: The present invention is a single-phase voltage source DC-AC power converter and a three-phase voltage source DC-AC power converter.Type: GrantFiled: January 28, 2010Date of Patent: August 6, 2013Assignee: Origin Electric Company, LimitedInventors: Masaaki Ohshima, Shuichi Ushiki, Jinbin Zhao, Hirokazu Shimizu
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Publication number: 20120161513Abstract: A single-phase voltage source AC/DC converter according to the present invention generates a second axis voltage command from difference between a DC voltage detection value at a DC terminal and a DC voltage command value and controls a DC voltage by increasing and decreasing active power with the second axis voltage command. For example, the voltage at the DC terminal is increased by decreasing active power when the DC voltage detection value at the DC terminal is lower than the DC voltage command, while the DC voltage detection value at the DC terminal is decreased by increasing the active power when the DC voltage detection value at the DC terminal is higher than the DC voltage command.Type: ApplicationFiled: December 19, 2011Publication date: June 28, 2012Inventors: Masaaki Ohshima, Shuichi Ushiki, Jinbin Zhao
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Publication number: 20120051104Abstract: An object is to provide a single-phase voltage type AC/DC converting device and a three-phase voltage type AC/DC converting device arranged between a load and a distribution network and is capable of contributing to stabilize a system frequency and a system voltage, and a stabilization controlling method of the system frequency and the system voltage. By applying an autonomous parallel operation control technique of an AC/DC converter to a load, which receives power from a distribution network, drooping characteristics (governor-free characteristics) for a frequency of active power and voltage-maintaining characteristics (V-Q characteristics) may be obtained. The governor-free characteristics are the characteristics to automatically decrease received power when the system frequency decreases and automatically increase the received power when this increases, so that even the load may contribute to stabilize the system frequency.Type: ApplicationFiled: July 25, 2011Publication date: March 1, 2012Inventors: Masaaki Ohshima, Shuichi Ushiki, Yasuhiro Genjima, Kiyomi Watanabe
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Publication number: 20110182091Abstract: An automatic synchronous parallelization apparatus capable of suppressing an inrush current by automatically adjusting the magnitude, the frequency, and the phase of the voltage when a single-phase voltage-type DC-to-AC converting device performing an autonomous parallel operation is connected in parallel with an external single-phase AC voltage source. The automatic synchronous parallelization apparatus includes a synchronization detecting circuit, a voltage amplitude command value generating circuit, and a frequency command value generating circuit.Type: ApplicationFiled: January 14, 2011Publication date: July 28, 2011Inventors: Masaaki Ohshima, Shuichi Ushiki, Jinbin Zhao
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Publication number: 20100302825Abstract: The present invention is a single-phase voltage source AC-DC power converter and a three-phase voltage source AC-DC power converter.Type: ApplicationFiled: January 28, 2010Publication date: December 2, 2010Applicant: Origin Electric Company, Limited.Inventors: Masaaki Ohshima, Shuichi Ushiki, Jinbin Zhao, Hirokazu Shimizu
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Patent number: 7495936Abstract: A three-phase voltage-fed AC/DC converter includes a conversion circuit which converts power from a DC voltage source to three-phase AC power. The converter further includes a UM conversion circuit which carries out dq conversion of the three-phase output voltage, a superior voltage control circuit which outputs a voltage reference vector based on a superior reference vector and an output voltage vector obtained by the UM conversion circuit, an inferior voltage control circuit which outputs a PWM reference based on the voltage reference vector and the output voltage vector, and a frequency control circuit which synchronizes a value generated based on a q-axis component from the UM conversion circuit with a rotation angle of a conversion matrix in the UM conversion circuit.Type: GrantFiled: February 27, 2007Date of Patent: February 24, 2009Assignee: Origin Electric Co., Ltd.Inventors: Masaaki Ohshima, Hirokazu Shimizu, Shuichi Ushiki, Jirou Fukui
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Publication number: 20070200607Abstract: A three-phase voltage-fed AC/DC converter includes a conversion circuit which converts power from a DC voltage source to three-phase AC power. The converter further includes a UM conversion circuit which carries out dq conversion of the three-phase output voltage, a superior voltage control circuit which outputs a voltage reference vector based on a superior reference vector and an output voltage vector obtained by the UM conversion circuit, an inferior voltage control circuit which outputs a PWM reference based on the voltage reference vector and the output voltage vector, and a frequency control circuit which synchronizes a value generated based on a q-axis component from the UM conversion circuit with a rotation angle of a conversion matrix in the UM conversion circuit.Type: ApplicationFiled: February 27, 2007Publication date: August 30, 2007Applicants: Origin ELECTRIC CO., LTD., The Tokyo Electric Power Company, IncorporatedInventors: Masaaki Ohshima, Hirokazu Shimizu, Shuichi Ushiki, Jirou Fukui
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Patent number: 7184282Abstract: To suppress a DC component in AC power in a power converter for converting DC power to AC power. DC power is converted to AC power by a converter 2, and the AC power is supplied to output terminals u1 and u2 via an inductor 3. The converter 2 is controlled based on an error ?(t) between an output current ip(t) outputted from the converter 2 and a target current j(t) outputted from a target current generation means 110 as a target value for the output current ip(t), and a DC component VD in an output terminal voltage v(t) is detected by a voltage detection means 18. A DC component ID is suppressed by correcting a target current j(t) by a DC component suppression means 8.Type: GrantFiled: March 7, 2006Date of Patent: February 27, 2007Assignees: Origin Electric Company, Limited, The Tokyo Electric Power Company, IncorporatedInventors: Masaaki Ohshima, Hirokazu Shimizu, Shuichi Ushiki
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Publication number: 20060256586Abstract: To suppress a DC component in AC power in a power converter for converting DC power to AC power. DC power is converted to AC power by a converter 2, and the AC power is supplied to output terminals u1 and u2 via an inductor 3. The converter 2 is controlled based on an error ?(t) between an output current iP(t) outputted from the converter 2 and a target current j(t) outputted from a target current generation means 110 as a target value for the output current iP(t), and a DC component VD in an output terminal voltage v (t) is detected by a voltage detection means 18. A DC component ID is suppressed by correcting a target current j(t) by a DC component suppression means 8.Type: ApplicationFiled: March 7, 2006Publication date: November 16, 2006Inventors: Masaaki Ohshima, Hirokazu Shimizu, Shuichi Ushiki
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Patent number: 5349514Abstract: A resonant forward converter comprises a saturable inductor connected in series to a primary winding of a transformer and a switching device. The saturable inductor has a predetermined value of inductance in a light current region and a small value of inductance at a predetermined integral voltage due to magnetic saturation.Type: GrantFiled: October 19, 1992Date of Patent: September 20, 1994Assignee: Origin Electric Company, LimitedInventors: Shuichi Ushiki, Ryoji Saito