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AssigneesHitachi, Ltd., The Kansai Electric Power Co., Inc.
InventorsJunichi Shiozaki, Akira Bando, Takao Kuwabara, Eiji Haraguchi, Hiroto Nakagawa
Estimating the term…
Disclosed is a control apparatus for a variable-speed hydraulic power generating system comprising a variable-speed a.c. electric generator connected to an a.c. electric power system and a hydraulic machine system including a water turbine for driving the generator and a guide vane for controlling an amount of water supplied to the water turbine. The control apparatus comprises a frequency converter connected between the electric power system and the generator for controlling electric power supplied from the generator to the electric power system, control means operating in response to at least an externally applied power generation command signal for controlling, on one hand, the frequency converter thereby controlling the electric power supplied from the generator to the electric power system and generating, on the other hand, a guide-vane opening command signal for controlling the guide vane thereby controlling the amount of water supplied to the water turbine, and means for reducing resonance which may occur in the hydraulic machine system when the rotation speed of the water turbine changes in response to a change of the externally applied power generation output command signal.
A control apparatus for a variable-speed hydraulic power generating system comprising a variable-speed electric generator electrically connected to an a.c. electric power system and a hydraulic machine system including a water turbine for driving the generator and a guide vane for controlling an amount of water supplied to the water turbine, said control apparatus comprising:
A control apparatus for a variable-speed hydraulic power generating system comprising a secondary-excitation type induction generator having a primary winding connected to an a.c. electric power system, secondary-excitation control means connected to a secondary winding of the induction generator for controlling the excitation of the secondary winding of the induction generator according to an externally applied power generation command signal thereby controlling the output of said induction generator, a water turbine for driving said induction generator, a guide vane for adjusting an amount of water to be supplied to the water turbine, a rotating speed command operator for determining an optimum rotating speed command signal based on at least said externally applied power generation command signal, means for detecting a rotating speed of said generator, means for producing a guide-vane opening command signal based on a difference between said optimum rotating speed command signal and the detected rotating speed of the generator, means for controlling an opening of the guide vane according to said guide-vane opening command signal, means for detecting a water pressure applied to said water turbine and means for correcting said guide-vane opening command signal according to a variation of said detected water pressure.
Dependencies are inferred from the claim text.