-
公开(公告)号：EP3972120A1
公开(公告)日：2022-03-23
申请号：EP19929015.6
申请日：2019-08-08
发明人： BANDO, Akira , KAWAZOE, Hironari , KIKUCHI, Akira
IPC分类号： H02P9/10
摘要： A secondary magnetic excitation generator-motor device that inputs a first ignition pulse command to a three-level NPC power converter such that a detected excitation current value corresponds with an excitation current command value, the secondary magnetic excitation generator-motor device having a function of identifying a first phase, a second phase, or a third phase in descending order of a current absolute value, the secondary magnetic excitation generator-motor device including a pulse command device to fix an ignition pulse in either a first-phase P group or a first-phase N group to an on-side, while fixing an ignition pulse in the other group to an off-side in a direction in which a first DC capacitor and a second DC capacitor are charged, to fix an ignition pulse in a second-phase P group to the same side as the first-phase N group, while fixing an ignition pulse in a second-phase N group to the same side as the first-phase P group, and to fix an ignition pulse in a third-phase first group to the on-side, while fixing an ignition pulse in a third-phase second group to the off-side to output the ignition pulses as a second ignition pulse command, wherein a pulse switch to output an ignition pulse command to the three-level NPC power converter switches the ignition pulse command to the second ignition pulse command when a current absolute value exceeds a set overcurrent level 1, and switches the ignition pulse command to the first ignition pulse command when current absolute values for three phases are all equal to or smaller than a set overcurrent level 2.
-
公开(公告)号：EP4120542A1
公开(公告)日：2023-01-18
申请号：EP21768252.5
申请日：2021-03-09
摘要： The invention provides a control device of a frequency converter, a control method of a frequency converter, and a control device of a variable speed pumped storage power generation system that can maintain a voltage balance using a high-efficiency and small-capacity energy storage element even in the case of a low output AC frequency. In the control device of a frequency converter, a rotating machine including a synchronous machine is interconnected to a power system. The frequency converter includes a plurality of sets of arms in which a plurality of unit converters are connected in series, capacitors are connected in parallel in the plurality of unit converters, one ends of the series connected unit converters are connected to respective phases of an alternating current, and the other ends of the series connected unit converters are connected to terminals of a direct current. The control device includes an AC voltage removal calculation unit configured to detect at least voltages of the capacitors in the plurality of unit converters that form the arms, extract a DC component from the capacitor voltages, and input the DC component; an arm voltage command generation unit configured to generate an arm voltage command value; a carrier signal generation unit configured to generate a carrier signal; and a gate pulse generation unit that is provided with a modulated wave generator configured to correct the arm voltage command value to be supplied by the arm voltage command generation unit and that uses the corrected arm voltage command value and the carrier signal to determine a gate command for each of the plurality of unit converters in respective arms. The modulated wave generator uses the DC component calculated in the AC voltage removal calculation unit to correct the arm voltage command value so that magnitude of the voltages of the capacitors in the unit converters of the arms does not fluctuate.
-
3.发明公开
公开(公告)号：EP4120553A1
公开(公告)日：2023-01-18
申请号：EP21768250.9
申请日：2021-03-09
摘要： Provided are a synchronous machine device, a variable speed pumped storage power generation device, and an operation method that can improve an operation tolerance when a system fault occurs during a bypass operation. The synchronous machine device is a device in which a power generation motor device is connected to a power system via a parallel circuit of a power converter and a bypass line including a circuit breaker. The synchronous machine device includes an estimation unit configured to estimate whether the power generation motor device steps out based on power of the power generation motor device and a system voltage when a system fault occurs in a state in which the power generation motor device is directly connected to the power system via the parallel circuit and the power converter is stopped, and a control device that includes a control unit configured to control to start up the power converter when it is estimated that the power generation motor device steps out.
-
4.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.
-
5.发明公开
公开(公告)号：EP3472906A1
公开(公告)日：2019-04-24
申请号：EP16906346.8
申请日：2016-06-21
申请人： Hitachi, Ltd.
发明人： LEE, Chia-Tse , KIKUCHI, Akira , OOHARA, Shinya
-
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.
-
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.
-
8.发明授权
公开(公告)号：EP3472906B1
公开(公告)日：2020-11-25
申请号：EP16906346.8
申请日：2016-06-21
申请人： Hitachi, Ltd.
发明人： LEE, Chia-Tse , KIKUCHI, Akira , OOHARA, Shinya
-
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.
-
公开(公告)号：EP3718815A1
公开(公告)日：2020-10-07
申请号：EP18883265.3
申请日：2018-10-23
申请人： Hitachi, Ltd.
发明人： TAKAHASHI, Hirofumi , ANDOU, Shinsuke , NAKAHARA, Mizuki , KAWAGUCHI, Yuki , MABUCHI, Yuuichi , KANOUDA, Akihiko , NEMOTO, Ryo , KIKUCHI, Akira , ITO, Tomomichi
摘要： An object is to provide a reliable power management system. In order to solve the above problems, a power management system according to the invention includes a power supply unit that is arranged in a power supply facility, a first electric wire that is used to supply power to an overhead wire in contact with an electric vehicle, a first power conversion unit that can supply power supplied from the power supply unit to the first electric wire, a load that is disposed in a power consumption facility, a second electric wire that is used to supply power to the load, a calculation unit that calculates power consumption of the load, a second power conversion unit that connects the first electric wire and the power consumption facility and can supply power in one or both directions, and a control unit that controls the first power conversion unit based on the power consumption of the load calculated by the calculation unit and an available power supply amount of the power supply unit, and controls power supply to the first electric wire.
-
-
-
-
-
-
-
-
-
搜索结果
11 条记录 (耗时 0.012 秒)
