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公开(公告)号：US20230378886A1
公开(公告)日：2023-11-23
申请号：US18251194
申请日：2020-11-11
Applicant: Mitsubishi Electric Corporation
Inventor： Takeshi KIKUCHI , Fuminori NAKAMURA , Ryosuke UDA
Abstract: In a power conversion system, a first power converter is connected between a first AC power system, and a first DC main line and a DC return line. A second power converter is connected between the first AC power system, and the DC return line and a second DC main line. A first control device controls the first power converter in accordance with a first active power command value. A second control device controls the second power converter in accordance with a second active power command value. A common control device sets the first active power command value and the second active power command value by distributing a command value of total active power output from the entire power conversion system to the first AC power system. The common control device makes the first active power command value and the second active power command value different from each other.
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公开(公告)号：US20180138826A1
公开(公告)日：2018-05-17
申请号：US15564402
申请日：2016-03-29
Applicant: MITSUBISHI ELECTRIC CORPORATION
Inventor： Takushi JIMICHI , Kimiyuki KOYANAGI , Takeshi KIKUCHI
CPC classification number: H02M7/497 , H02J3/1857 , H02M7/062 , H02M7/48 , H02M7/483 , H02M7/487 , H02M7/49 , H02M7/53871 , H02M2007/4835
Abstract: An electric power conversion device includes a first arm and a second arm each including converter cells. The converter cell of the first arm is a first converter cell having a full-bridge configuration including an energy storing element and semiconductor switching elements. The converter cell of the second arm is a second converter cell having a half-bridge configuration including an energy storing element and semiconductor switching elements. Thus, short-circuit current between DC terminals is suppressed.
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公开(公告)号：US20230369956A1
公开(公告)日：2023-11-16
申请号：US18246171
申请日：2020-09-29
Applicant: Mitsubishi Electric Corporation
Inventor： Fuminori NAKAMURA , Takeshi KIKUCHI , Daisuke YAMANAKA
CPC classification number: H02M1/0003 , H02M7/48 , H02M7/12
Abstract: 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 calculates a deviation between a control command value for the self-commutated power converter and a feedback value from the self-commutated power converter, and performs first control to increase a switching frequency of the switching element when the deviation becomes equal to or greater than a first threshold value.
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公开(公告)号：US20190386578A1
公开(公告)日：2019-12-19
申请号：US16479252
申请日：2017-02-27
Applicant: Mitsubishi Electric Corporation
Inventor： Takuya KAJIYAMA , Takeshi KIKUCHI , Kaho MUKUNOKI , Osamu MORI , Toshiyuki FUJII
IPC: H02M7/155 , H02M7/5387 , H02M5/458
Abstract: A DC power transmission system interconnects a plurality of AC systems via a DC line. A plurality of power conversion devices are connected between the plurality of AC systems and the DC line. One of the plurality of power conversion devices controls the voltage on the DC line, while the remaining power conversion device controls a current input and output to and from the DC line. In a restart which resumes power conversion from a stopped state for controlling a DC current on the DC line, the power conversion device performing current control monitors the voltage on the DC line and starts a restart operation without transmitting or receiving information to or from the other power conversion device.
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公开(公告)号：US20180159422A1
公开(公告)日：2018-06-07
申请号：US15571716
申请日：2016-07-07
Applicant: Mitsubishi Electric Corporation
Inventor： Takeshi KIKUCHI , Toshiyuki FUJII , Kaho MUKUNOKI
CPC classification number: H02M1/32 , H02M1/0845 , H02M1/12 , H02M7/12 , H02M7/219 , H02M2001/007 , Y02E60/60
Abstract: The present invention is provided with a power converter and a control device for controlling the power converter, wherein each of the positive arm and the negative arm is comprised one converter cell or a plurality of converter cells connected in series, each converter cell being comprised: a series unit in which a plurality of switching elements are connected in series to each other; and a DC capacitor connected in parallel to the series unit, and the control device includes a DC voltage command value calculation unit which calculates a voltage command value for outputting, during a DC short circuit fault, AC voltage similar to that in a steady state to the AC terminal of the power converter, and for outputting, to the DC terminal of the power converter, DC voltage that allows the protection relay in the DC line to operate.
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Patent Agency Ranking
公开(公告)号：US20230098992A1
公开(公告)日：2023-03-30
申请号：US17792221
申请日：2020-03-04
Applicant: Mitsubishi Electric Corporation
Inventor： Takeshi KIKUCHI , Shigeo HAYASHI
Abstract: A voltage generated in a DC line at the time when a sub module is deactivated in the event of a short-circuiting fault in the DC line is suppressed. A power conversion system includes a power converter including a leg circuit, a control device, and a voltage suppression circuit connected to a DC line. The leg circuit includes a plurality of sub modules connected in series, and at least one of them is a first sub module implemented by a sub module in a full-bridge configuration or a 1.5 half-bridge configuration. When the control device detects a short-circuiting fault in the DC line, it stops a switching operation of the plurality of sub modules. The voltage suppression circuit is configured to suppress a voltage generated in the DC line when the switching operation is stopped.
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公开(公告)号：US20220158568A1
公开(公告)日：2022-05-19
申请号：US17439574
申请日：2019-04-25
Applicant: Mitsubishi Electric Corporation
Inventor： Ryosuke UDA , Takeshi KIKUCHI , Shuhei FUJIWARA , Yoshiyuki KONO
Abstract: 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.
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公开(公告)号：US20200220471A1
公开(公告)日：2020-07-09
申请号：US16631196
申请日：2017-09-11
Applicant: Mitsubishi Electric Corporation
Inventor： Takeshi KIKUCHI , Toshiyuki FUJII , Ryosuke UDA
Abstract: A power conversion system includes a first power converter and a second power converter which are capable of converting an alternating-current power into a direct-current power or converting a DC power into an AC power. The first power converter is interconnectable to a first AC system via a first AC circuit breaker. The second power converter is interconnectable to a second AC system via a second AC circuit breaker. A first DC terminal of the first power converter and a second DC terminal of the second power converter are connectable. The first power converter begins operation prior to the second power converter. A first control device controls a voltage of the first DC terminal, based on a status of the second power converter sent from a second control device.
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公开(公告)号：US20240250603A1
公开(公告)日：2024-07-25
申请号：US18561526
申请日：2021-06-10
Applicant: Mitsubishi Electric Corporation , TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
Inventor： Miwako TANAKA , Kaho MUKUNOKI , Toshiyuki FUJII , Takeshi KIKUCHI , Tomohiko TATSUMI , Takashi SUGIYAMA , Ryota OKUYAMA
CPC classification number: H02M1/12 , H02M7/4833 , H02M7/49
Abstract: A power conversion unit includes a plurality of arms each having a plurality of converter cells connected to each other in cascade. A converter control unit that controls the power conversion unit includes a voltage command value computing unit to compute an output voltage command value for each arm, and a gate signal generating unit to generate an on/off control signal of each switching element of each converter cell in accordance with the output voltage command value. A voltage command value computing unit is configured to generate the output voltage command value with compensation for an AC vibration component, extracted for each arm, of stored energy of power storage elements of a plurality of converter cells included in the arm.
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公开(公告)号：US20220200475A1
公开(公告)日：2022-06-23
申请号：US17603471
申请日：2019-04-25
Applicant: Mitsubishi Electric Corporation
Inventor： Ryosuke UDA , Takeshi KIKUCHI , Shuhei FUJIWARA , Yoshiyuki KONO
Abstract: 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.
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