Patents by Inventor Yoshiyuki Kono
Yoshiyuki Kono 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: 12081138Abstract: A power conversion device includes a power conversion circuit unit including a plurality of leg circuits. Each of the leg circuits includes a plurality of converter cells each having a capacitor and connected in series to each other. Each of the plurality of converter cells is a first converter cell including at least two switching elements or a second converter cell including at least four switching elements. The power conversion device further includes a control device. The control device operates the plurality of the first converter cells that are controlled not based on a circulating current circulating between the plurality of leg circuits as a voltage source that outputs a circulating voltage in a circulation circuit indicating a closed circuit that does not include a DC circuit and an AC circuit, and operates the plurality of the second converter cells to control the circulating current in the circulation circuit.Type: GrantFiled: March 11, 2020Date of Patent: September 3, 2024Assignee: Mitsubishi Electric CorporationInventors: Takuya Kajiyama, Toshiyuki Fujii, Shuhei Fujiwara, Ryosuke Uda, Yoshiyuki Kono
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Patent number: 12074535Abstract: A control device includes: a phase generation unit to generate a phase of a voltage command for the power converter; a voltage control unit to generate a voltage value of the voltage command; and a command unit to output the voltage command having the phase and the voltage value to the power converter. The voltage control unit includes: a voltage compensator unit to compute a compensation voltage value, based on a voltage deviation of a point-of-interconnection voltage from a reference voltage; a droop calculator unit to compute a first droop value in accordance with a magnitude of a point-of-interconnection current, when the AC power system is an isolated system, the isolated system being the AC power system not connected to a generator; and a calculation unit to calculate the voltage value of the voltage command, based on a difference between the compensation voltage value and the first droop value.Type: GrantFiled: April 25, 2019Date of Patent: August 27, 2024Assignee: Mitsubishi Electric CorporationInventors: Ryosuke Uda, Takeshi Kikuchi, Shuhei Fujiwara, Yoshiyuki Kono
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Patent number: 12068610Abstract: A control device includes: a phase error calculation unit to calculate a phase error between a phase of a voltage command for the power converter and a phase of a point-of-interconnection voltage; and an isolated system determination unit to determine whether the AC power system has shifted from an interconnected system to an isolated system, based on the phase error and a magnitude of the point-of-interconnection voltage, the interconnected system being the AC power system connected to a generator, the isolated system being the AC power system not connected to the generator. The isolated system determination unit determines that the AC power system has shifted from the interconnected system to the isolated system, when at least a first condition is met that the phase error is outside a reference range and the magnitude of the point-of-interconnection voltage is greater than a first voltage threshold.Type: GrantFiled: April 25, 2019Date of Patent: August 20, 2024Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Ryosuke Uda, Takeshi Kikuchi, Shuhei Fujiwara, Yoshiyuki Kono
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Patent number: 12057787Abstract: A power conversion device includes a power conversion circuit unit including a plurality of leg circuits, and a control device. Each of the leg circuits includes a plurality of first converter cells each having a capacitor and connected in series to each other and a plurality of second converter cells each having the capacitor and connected in series to each other. The plurality of first converter cells are controlled not based on a circulating current circulating between the plurality of leg circuits, and the plurality of second converter cells are controlled based on the circulating current. The control device stops a switching operation of at least one second converter cell in the plurality of second converter cells when a voltage at the capacitor in the second converter cell becomes less than a first threshold.Type: GrantFiled: March 11, 2020Date of Patent: August 6, 2024Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Takuya Kajiyama, Toshiyuki Fujii, Shuhei Fujiwara, Ryosuke Uda, Yoshiyuki Kono
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Patent number: 12009759Abstract: A power conversion system includes: a first power converter to perform power conversion between a first AC system and a DC circuit; and a second power converter to perform power conversion between a second AC system and the DC circuit. Each of the first power converter and the second power converter includes a plurality of submodules connected in series. Each of the plurality of submodules includes a plurality of switching elements and a capacitor. A first fundamental frequency of the first AC system is greater than a second fundamental frequency of the second AC system. A first average voltage value of a capacitor in a first submodule included in the first power converter is larger than a second average voltage value of a capacitor in a second submodule included in the second power converter.Type: GrantFiled: June 17, 2020Date of Patent: June 11, 2024Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Yoshiyuki Kono, Shuhei Fujiwara, Ryosuke Uda, Takuya Kajiyama, Toshiyuki Fujii
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Publication number: 20240154519Abstract: A control device includes a power generator simulation unit to generate a voltage command value, and a signal generation unit to generate a control signal for the power converter. The power generator simulation unit includes a first integrator to time-integrate a first difference between effective power and a target value of the effective power and output a first angular frequency, a second integrator to time-integrate the first angular frequency and output a phase of an AC voltage, and a voltage command generation unit to generate the voltage command value based on the AC voltage, a target value of the AC voltage, and the phase. When a voltage difference between the AC voltage and the target value of the AC voltage is greater than a threshold, the first integrator outputs a difference between an angular frequency of the AC voltage and a reference angle frequency as the first angular frequency.Type: ApplicationFiled: March 19, 2021Publication date: May 9, 2024Applicant: Mitsubishi Electric CorporationInventors: Shuhei FUJIWARA, Ryosuke UDA, Yoshiyuki KONO
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Publication number: 20240146066Abstract: In a power grid stabilization system, a second energy storage system has a larger energy storage capacity than a first energy storage system. A bidirectional AC/DC converter is connected between an AC power grid and a pair of input and output terminals of the first energy storage system. A first bidirectional DC/DC converter is connected between the pair of input and output terminals of the first energy storage system and a pair of input and output terminals of the second energy storage system.Type: ApplicationFiled: June 1, 2021Publication date: May 2, 2024Applicant: Mitsubishi Electric CorporationInventors: Frederick PAGE, Yoshiyuki KONO, Kazuyori TAHATA, Shuhei FUJIWARA, Shinji TOMINAGA, Masatoshi TAKEDA
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Publication number: 20240088673Abstract: An electric power control system includes a plurality of power converters connected in parallel. Each power converter, among the plurality of power converters, converts a direct-current power of an electricity storage device connected to the power converter into an alternating-current power, and outputs the alternating-current power to the power system. The electric power control system further includes: a power generator simulation unit to simulate characteristics of the synchronous generator based on an aggregate active power to generate a phase of the alternating-current voltage; a signal generation unit to generate a control signal for the power converter, based on the phase of the alternating-current voltage. The power generator simulation unit generates a first angular frequency based on a first difference between the aggregate active power and a target value for the aggregate active power, and generates, based on the first angular frequency, the phase of the alternating-current voltage.Type: ApplicationFiled: February 5, 2021Publication date: March 14, 2024Applicant: Mitsubishi Electric CorporationInventors: Kazuyori TAHATA, Yoshiyuki KONO, Shuhei FUJIWARA, Shinji TOMINAGA
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Publication number: 20240072642Abstract: A power conversion device includes a power converter connected between a multi-phase alternating-current circuit and a direct-current circuit, and a control device to control the power converter. The control device detects an unbalanced component indicating a voltage unbalanced component or a current unbalanced component of the alternating-current circuit and limits a magnitude of an alternating current flowing between the power converter and the alternating-current circuit based on the unbalanced component.Type: ApplicationFiled: January 15, 2021Publication date: February 29, 2024Applicant: Mitsubishi Electric CorporationInventors: Takuya KAJIYAMA, Toshiyuki FUJII, Shuhei FUJIWARA, Yoshiyuki KONO, Ryosuke UDA
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Patent number: 11892324Abstract: A rotation angle sensor includes a sensor integrated circuit attached to an attachment member. The attachment member includes a connecting terminal protruding upward from an attachment surface and a guide protruding upward from the attachment surface and positions, together with the connecting terminal, the sensor integrated circuit at an attachment position. The sensor integrated circuit includes a lead frame on which an electronic circuit is mounted and an exterior covering the electronic circuit. The lead frame includes a lead and an extending portion located in an outer periphery of the exterior. At least one of the lead and the extending portion has an elastic structure. The sensor integrated circuit is attached to the attachment member by an elastic force of the elastic structure that biases the extending portion against the guide and that joins the lead to the connecting terminal.Type: GrantFiled: March 17, 2021Date of Patent: February 6, 2024Assignee: DENSO CORPORATIONInventors: Takeshi Ito, Yoshiyuki Kono
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Publication number: 20240014669Abstract: A power storage apparatus of one embodiment includes a storage bank including a plurality of power storage elements connected to each other; and one or plurality of first cells. The storage bank and the one or plurality of first cells are connected in series to each other. Each first cell includes a pair of input/output nodes, a bridge circuit including at least two semiconductor switching elements, and a power storage element connected to the pair of input/output nodes via the bridge circuit. A storage capacity of the power storage element of each first cell is smaller than a storage capacity of the storage bank.Type: ApplicationFiled: November 11, 2020Publication date: January 11, 2024Applicant: Mitsubishi Electric CorporationInventors: Yoshiyuki KONO, Shuhei FUJIWARA, Kazuyori TAHATA, Frederick PAGE, Shinji TOMINAGA, Masatoshi TAKEDA
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Publication number: 20230361690Abstract: A power conversion device includes a self-commutated power converter that performs power conversion between an AC circuit and a DC circuit, and a control device that controls switching operation of a switching element included in the self-commutated power converter. The control device performs first control to increase a switching frequency of the switching element when a control command value for the self-commutated power converter becomes equal to or greater than a first threshold value.Type: ApplicationFiled: September 29, 2020Publication date: November 9, 2023Applicant: Mitsubishi Electric CorporationInventors: Fuminori NAKAMURA, Yoshiyuki KONO, Ryosuke UDA
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Publication number: 20230291327Abstract: A power conversion system includes a plurality of power conversion devices connected to a plurality of AC systems, respectively. The power conversion devices are further connected to a common DC circuit. The power conversion system further includes a start-up device to start up each power conversion device. The start-up device selects an AC system that satisfies a defined condition relating to power supply capability from among the plurality of AC systems based on system information of the plurality of AC systems and starts up a power conversion device connected to the selected AC system.Type: ApplicationFiled: August 21, 2020Publication date: September 14, 2023Applicant: Mitsubishi Electric CorporationInventors: Shuhei FUJIWARA, Yoshiyuki KONO, Ryosuke UDA, Takuya KAJIYAMA, Toshiyuki FUJII
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Publication number: 20230170822Abstract: A power conversion device includes a power converter including a plurality of arms each having a plurality of converter cells connected to each other in cascade. Each converter cell includes a capacitor electrically connected to input/output terminals through a plurality of switching elements. A control device performs AC current control in accordance with a deviation between a detected AC current and an AC current command value and individual voltage control in accordance with a deviation between a voltage of each individual capacitor and an individual voltage command value. The control device calculates an evaluation value indicating the degree of variations in voltage of the individual capacitors. When the evaluation value is greater than a threshold value, the control device changes control of the power converter such that arm current flowing through each of the arms increases while the AC current control and the individual voltage control are being performed.Type: ApplicationFiled: June 17, 2020Publication date: June 1, 2023Applicant: Mitsubishi Electric CorporationInventors: Shuhei FUJIWARA, Yoshiyuki KONO, Ryosuke UDA, Takuya KAJIYAMA, Toshiyuki FUJII, Shigeo HAYASHI
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Publication number: 20230147142Abstract: A power conversion system includes: a first power converter to perform power conversion between a first AC system and a DC circuit; and a second power converter to perform power conversion between a second AC system and the DC circuit. Each of the first power converter and the second power converter includes a plurality of submodules connected in series. Each of the plurality of submodules includes a plurality of switching elements and a capacitor. A first fundamental frequency of the first AC system is greater than a second fundamental frequency of the second AC system. A first average voltage value of a capacitor in a first submodule included in the first power converter is larger than a second average voltage value of a capacitor in a second submodule included in the second power converter.Type: ApplicationFiled: June 17, 2020Publication date: May 11, 2023Applicant: Mitsubishi Electric CorporationInventors: Yoshiyuki KONO, Shuhei FUJIWARA, Ryosuke UDA, Takuya KAJIYAMA, Toshiyuki FUJII
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Publication number: 20230124367Abstract: A power conversion device includes a plurality of leg circuits and a control device. The control device controls an output voltage at a first converter cell, which is controlled not based on the circulating current, based on a first voltage instruction value. The control device controls an output voltage at a second converter cell using a first value based on a deviation between a circulating current and a circulating current instruction value and a second value based on a deviation between a capacitor voltage and a capacitor voltage instruction value in the second converter cell. When the capacitor voltage at the second converter cell is less than a first threshold, the control device linearly combines an auxiliary voltage instruction value including at least one of a DC component and a fundamental AC component of the AC circuit with the first value and the second value.Type: ApplicationFiled: March 11, 2020Publication date: April 20, 2023Applicant: Mitsubishi Electric CorporationInventors: Takuya KAJIYAMA, Toshiyuki FUJII, Shuhei FUJIWARA, Ryosuke UDA, Yoshiyuki KONO
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Publication number: 20230066656Abstract: A power conversion device includes a power conversion circuit unit including a plurality of leg circuits, and a control device. Each of the leg circuits includes a plurality of first converter cells each having a capacitor and connected in series to each other and a plurality of second converter cells each having the capacitor and connected in series to each other. The plurality of first converter cells are controlled not based on a circulating current circulating between the plurality of leg circuits, and the plurality of second converter cells are controlled based on the circulating current. The control device stops a switching operation of at least one second converter cell in the plurality of second converter cells when a voltage at the capacitor in the second converter cell becomes less than a first threshold.Type: ApplicationFiled: March 11, 2020Publication date: March 2, 2023Applicant: Mitsubishi Electric CorporationInventors: Takuya KAJIYAMA, Toshiyuki FUJII, Shuhei FUJIWARA, Ryosuke UDA, Yoshiyuki KONO
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Publication number: 20230056080Abstract: A power conversion device includes a power conversion circuit unit including a plurality of leg circuits. Each of the leg circuits includes a plurality of converter cells each having a capacitor and connected in series to each other. Each of the plurality of converter cells is a first converter cell including at least two switching elements or a second converter cell including at least four switching elements. The power conversion device further includes a control device. The control device operates the plurality of the first converter cells that are controlled not based on a circulating current circulating between the plurality of leg circuits as a voltage source that outputs a circulating voltage in a circulation circuit indicating a closed circuit that does not include a DC circuit and an AC circuit, and operates the plurality of the second converter cells to control the circulating current in the circulation circuit.Type: ApplicationFiled: March 11, 2020Publication date: February 23, 2023Applicant: Mitsubishi Electric CorporationInventors: Takuya KAJIYAMA, Toshiyuki FUJII, Shuhei FUJIWARA, Ryosuke UDA, Yoshiyuki KONO
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Publication number: 20230035598Abstract: A power conversion device includes a power conversion circuit unit including a plurality of leg circuits, and a control device. Each of the leg circuits includes a plurality of first converter cells each having a capacitor and connected in series to each other and a plurality of second converter cells each having the capacitor and connected in series to each other. The plurality of first converter cells are controlled not based on a circulating current circulating between the plurality of leg circuits, and the plurality of second converter cells are controlled based on the circulating current. The control device executes control processing for increasing a current flowing through the second converter cell when a voltage at the capacitor in the second converter cell is less than a first threshold value.Type: ApplicationFiled: March 11, 2020Publication date: February 2, 2023Applicant: Mitsubishi Electric CorporationInventors: Takuya KAJIYAMA, Toshiyuki FUJII, Shuhei FUJIWARA, Ryosuke UDA, Yoshiyuki KONO
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Publication number: 20220393616Abstract: A voltage evaluation value generator receives voltage detection values of power storage elements of all of converter cells included in a power converter and generates a first voltage evaluation value of each power storage element of all of the converter cells and a second voltage evaluation value of each power storage element in a plurality of converter cells included in each of a plurality of groups obtained by classifying all of the converter cells in advance, without using a mean value of voltage detection values. A voltage macro controller uses the voltage evaluation value to calculate a control value set in common to at least the converter cells in the same group for controlling deficiency and excess of stored energy in all of the converter cells and the converter cells in each group.Type: ApplicationFiled: December 2, 2019Publication date: December 8, 2022Applicant: Mitsubishi Electric CorporationInventors: Shuhei FUJIWARA, Yoshiyuki KONO, Ryosuke UDA, Takuya KAJIYAMA, Toshiyuki FUJII, Shigeo HAYASHI