公开(公告)号：EP3806318A1

公开(公告)日：2021-04-14

申请号：EP19814983.3

申请日：2019-06-06

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

发明人： BANDO, Akira ,  OYAKE, Takashi ,  ICHINOSE, Masaya

IPC分类号： H02P9/10 ,  H02M7/483

摘要： In a variable speed generator/motor device including a variable frequency power converter, a direct current voltage device including a voltage type self-excited converter, an automatic voltage adjuster, and a converter current adjuster that controls unit converters, a first three-phase branch circuit is provided between the direct current voltage device and an alternating current system; a second three-phase branch circuit is provided between the variable frequency power converter and a three-phase alternating current synchronous machine; a first load switch is provided between the first three-phase branch circuit and the second three-phase branch circuit; a measurement current transformer is provided between the three-phase alternating current synchronous machine and the second three-phase branch circuit; when switching from a converter mode in which the variable frequency power converter drives the three-phase alternating current synchronous machine to generate power to a bypass mode, the first load switch is closed to stop a gate command to the unit converters; and when switching from the bypass mode to the converter mode, a current command value of the converter current adjuster is calculated from a current value of the measurement current transformer, the gate command to the unit converters is started, and the first load switch is opened.

公开(公告)号：EP3823158A1

公开(公告)日：2021-05-19

申请号：EP19834005.1

申请日：2019-07-01

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

发明人： BANDO, Akira ,  OYAKE, Takashi ,  ICHINOSE, Masaya

IPC分类号： H02P9/04 ,  H02M7/12 ,  H02M7/493 ,  H02M7/497 ,  H02P9/00

摘要： In a variable speed generator/motor device including a variable frequency power converter, a direct current voltage device including a voltage type self-excited converter, an automatic voltage adjuster, and a converter current adjuster that controls unit converters, a first three-phase branch circuit is provided between the direct current voltage device and an alternating current system; a second three-phase branch circuit is provided between the variable frequency power converter and a three-phase squirrel-cage induction machine; a first load switch is provided between the first three-phase branch circuit and the second three-phase branch circuit; a measurement current transformer is provided between the three-phase squirrel-cage induction machine and the second three-phase branch circuit; when switching from a converter mode in which the variable frequency power converter drives the three-phase squirrel-cage induction machine to generate power to a bypass mode, the first load switch is closed to stop a gate command to the unit converters; and when switching from the bypass mode to the converter mode, a current command value of the converter current adjuster is calculated from a current value of the measurement current transformer, the gate command to the unit converters is started, and the first load switch is opened.