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

申请人： Hitachi Mitsubishi Hydro Corporation ,  Hitachi, Ltd. ,  Hitachi Industrial Products, Ltd.

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.

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

申请人： Hitachi Mitsubishi Hydro Corporation ,  Hitachi, Ltd.

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.