公开(公告)号：US4856965A

公开(公告)日：1989-08-15

申请号：US260690

申请日：1988-10-21

申请人： Masahiro Katsuie ,  Michiyuki Abe ,  Katsuyuki Kawahara ,  Taizo Nakamura

发明人： Masahiro Katsuie ,  Michiyuki Abe ,  Katsuyuki Kawahara ,  Taizo Nakamura

IPC分类号： H02P3/22 ,  H02P3/18 ,  H02P9/08 ,  H02P9/42

CPC分类号： H02P9/42 ,  H02P9/08 ,  H02P2101/10

摘要： A control system of pumping operation comprises a cycloconverter for converting AC power from a AC power system into AC power having a given frequency, anAC exciting generator-motor, having a stator side electrically connected to the AC power system, having a rotor side electrically connected to the cycloconverter, and having a rotor shaft mechanically coupled to a pump-turbine by which the pumping operation is carried out, a circuit breaker inserted between the AC power system and the AC exciting generator-motor, a rotation speed controller for controlling a rotation speed of the AC exciting generator-motor such that the rotation speed becomes slow when the pumping operation is to be stopped, an AC excitation controller for decreasing a degree of excitation effected by the cycloconverter, wherein decreasing of the excitation degree starts when the rotation speed of the AC exciting generator-motor reaches a given minimum value, and a circuit breaker controller for turning off the circuit breaker when input power, supplied from the AC power system to the AC exciting generator-motor becomes substantially zero.