H - Electricity – 02 – P
Patent
H - Electricity
02
P
342/37
H02P 9/08 (2006.01) H02P 9/42 (2006.01)
Patent
CA 1309477
Abstract of the Disclosure 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, an AC exciting generator-motor, having a stator side electri- cally 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 con- troller 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.
580913
Abe Michiyuki
Katsuie Masahiro
Kawahara Katsuyuki
Nakamura Taizo
Abe Michiyuki
Kabushiki Kaisha Toshiba
Katsuie Masahiro
Kawahara Katsuyuki
Marks & Clerk
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