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公开(公告)号：EP4216422A1
公开(公告)日：2023-07-26
申请号：EP20954196.0
申请日：2020-09-18
发明人： BANDO, Akira , KIKUI, Takahiko , WATANABE, Kenta , ITO, Tomomichi , KIYOFUJI, Yasuhiro , ISHIKAWA, Masakazu , NAKAIDE, Yosuke
IPC分类号： H02M7/49
摘要： A modular multilevel power converter includes: a capacitor voltage adjustment unit that calculates an active current component command to make an average voltage of capacitors match a command value; an active power detector that receives an AC current signal and an AC voltage signal and calculates an active power; an active power adjustment unit that calculates a DC current command value to make the active power match a command value; a first active power command suppressor that suppresses an absolute value of an active power command value to 0 or 0.2 times a rated DC current or less in a period in which an output level of a first level detector is 1, the first level detector switching the output level from 0 to 1 when a positive-phase voltage amplitude of a three-phase voltage becomes equal to or less than a first set value and switching the output level from 1 to 0 when a positive-phase voltage amplitude of the three-phase voltage becomes equal to or more than a second set value; and a second active power command suppressor that adjusts an absolute value of an active power command value to 0.3 times a rated DC current or more and 0.7 times the rated DC current or less in a period in which an output level of a second level detector is 1, the second level detector switching the output level from 0 to 1 when the negative-phase voltage amplitude of the three-phase voltage becomes equal to or more than a third set value and switching the output level from 1 to 0 when the negative-phase voltage amplitude becomes equal to or less than a fourth set value.
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公开(公告)号：EP3745587A2
公开(公告)日：2020-12-02
申请号：EP20172336.8
申请日：2020-04-30
申请人： Hitachi, Ltd.
IPC分类号： H02P6/20
摘要： Provided are a high-efficiency power conversion device and a variable-speed pumped-storage power generation system that can achieve long life span and improved reliability. A power conversion device includes a bypass switch connected in parallel to a frequency converter for performing AC-AC conversion including a converter for performing AC-DC conversion and a converter for performing DC-AC conversion. A control device of the frequency converter includes an AC current control unit (301) that controls an AC current flowing to the frequency converter, a DC current control unit (302) that controls a DC current flowing to the frequency converter, and a zero-phase current control unit (303) that controls a zero-phase current flowing to the bypass switch. The zero-phase current control unit (303) is operated when the bypass switch and the frequency converter are switched.
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3.发明公开
公开(公告)号：EP3661043A1
公开(公告)日：2020-06-03
申请号：EP19211807.3
申请日：2019-11-27
申请人： Hitachi, Ltd.
摘要： Main arms 10UP, 10VP, 10WP, 10UN, 10VN, and 10WN and sub-arms 11UP, 11VP, 11WP, 11UN, 11VN, and 11WN are provided for each of the P-side and N-side of each phase, the main arms 10UP, 10VP, 10WP, 10UN, 10VN, and 10WN and the sub-arms 11UP, 11VP, 11WP, 11UN, 11VN, and 11WN are connected in parallel for each of the P-side and N-side of each phase of the U-phase, V-phase, and W-phase, and the power conversion control unit 13 controls an inter-parallel arms circulation current that circulates between the main arms and the sub-arms, that are connected in parallel, in the same phase.
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公开(公告)号：EP4160901A1
公开(公告)日：2023-04-05
申请号：EP21812217.4
申请日：2021-04-15
申请人： Hitachi, Ltd.
摘要： A control device and a control method for a highly efficient power conversion device are provided. A control device for a modular multi-level power conversion device including one or more arm converters per AC phase, each having a plurality of unit converters each with an energy storage element connected in series, including: AC current control means for controls an AC current to a desired value by feedback; circulating current control means for controlling a circulating current flowing through the arm converter of each phase of the AC current of the modular multi-level power conversion device to a circulating current command value by feedback; and PWM command generation means for generating and controlling a gate signal of the unit converter configuring the arm converter according to an AC voltage target of the each AC phase obtained by correcting an output of the AC current control means according to an output of the circulating current control means, in which the circulating current control means includes circulating current command calculation means for calculating an amplitude of the circulating current command value according to a power factor of the power conversion device.
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公开(公告)号：EP3745587A3
公开(公告)日：2021-04-14
申请号：EP20172336.8
申请日：2020-04-30
申请人： Hitachi, Ltd.
摘要： Provided are a high-efficiency power conversion device and a variable-speed pumped-storage power generation system that can achieve long life span and improved reliability. A power conversion device includes a bypass switch connected in parallel to a frequency converter for performing AC-AC conversion including a converter for performing AC-DC conversion and a converter for performing DC-AC conversion. A control device of the frequency converter includes an AC current control unit (301) that controls an AC current flowing to the frequency converter, a DC current control unit (302) that controls a DC current flowing to the frequency converter, and a zero-phase current control unit (303) that controls a zero-phase current flowing to the bypass switch. The zero-phase current control unit (303) is operated when the bypass switch and the frequency converter are switched.
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公开(公告)号：EP4395157A1
公开(公告)日：2024-07-03
申请号：EP21954952.4
申请日：2021-08-23
发明人： BANDO, Akira , KIKUI, Takahiko , WATANABE, Kenta , KIYOFUJI, Yasuhiro , ISHIKAWA, Masakazu , ITO, Tomomichi , ICHINOSE, Masaya , NARUSHIMA, Jun , MEGURO, Hikaru
IPC分类号： H02P9/10 , H02P29/028
CPC分类号： H02P9/10 , H02P29/028
摘要： There is provided an adjustable speed generator motor system with full power converter (FPC system) in which two 3-level converters (1, 8) are connected back-to-back on the DC side as frequency converters, and by providing a mode in which a fly-wheeling diode is forced to conduct a current independently for three phases according to the current polarity when overcurrent is detected in an AC system-side 3-level converter (1) and a mode in which the fly-wheeling diode is forced to conduct a current independently for three phases according to magnitude relation of the absolute value of a 3-phase AC current in a generator motor-side 3-level converter (8) and the current polarity of each phase when an imbalanced value between positive and negative DC capacitor voltages (15, 16) exceeds a threshold, the FPC system is capable of continuing stable operation regardless of an occurrence point of a system-side fault and an accident mode.
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公开(公告)号：EP4383550A1
公开(公告)日：2024-06-12
申请号：EP22853153.9
申请日：2022-08-04
摘要： To provide a power conversion apparatus for reducing time taken for initial charging and discharging operations of the power conversion apparatus, and reducing the size of the initial charging device, and to further provide the control apparatus. A power conversion apparatus includes a unit converter that is formed through parallel connection of a capacitor and a switching circuit constituted by two sets of series-connected switching elements having reflux diodes connected in parallel, a power converter that forms an arm having circulating current suppression reactors connected in series, forms a leg by two sets of the arms connected in series, and connects a connection point of the two sets of the arms, serving as an AC terminal to a phase of a first AC power source to cause both ends of the leg to serve as DC terminals, and a charging and discharging device having one end connected to a second AC power source, and the other end connected to the phase of the first AC power source. The charging and discharging device includes a tapped transformer which makes a position switchable between a high-voltage tap position and a low-voltage tap position, and is connected to the power converter instead of the first AC power source when starting and stopping the power converter.
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8.发明公开
公开(公告)号：EP3468027A1
公开(公告)日：2019-04-10
申请号：EP18198176.2
申请日：2018-10-02
申请人： Hitachi, Ltd.
发明人： KAWAZOE, Hironari , ITO, Tomomichi , KIKUCHI, Akira , WATANABE, Kenta , TANAKA, Chikara , KIYOFUJI, Yasuhiro
摘要： The invention is directed to a power conversion device including a main circuit unit (1) having a plurality of arms to which outputs of a plurality of converters (cells) are connected in series, a driving unit (105) (PWM control unit) which generates a driving signal for driving a plurality of semiconductor switching elements in the main circuit unit (1) according to a voltage command and outputs the signal to the plurality of semiconductor switching elements, an AC control unit (102) (AC current control unit) which generates AC voltage commands for the number of phases on a AC side for controlling AC power of a target to be controlled, and a DC control unit (103) (capacitor average voltage control unit) which generates a DC voltage command for setting an average value of DC voltages of the plurality of capacitors in the main circuit unit (1) to a predetermined value, in which the target to be controlled (rotating machine) is connected to the AC side of the main circuit unit (1), and a voltage command inputted by the driving unit (105) includes the AC voltage command and the DC voltage command.
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