VARIABLE SPEED PUMP-UP CONTROL METHOD AND APPARATUS

摘要

A method and an apparatus for stable controlling toward a target value during AFC (automatic frequency control) operation for pumping-up in a variable speed dynamo system. The phase angle of the secondary exciting voltages is controlled using the difference between a power control command and an actual power level. For controlling the guide vane opening (Y), the actual revolution number is utilized. Thus, on the basis of an actual value of the revolution number (N) and a lift head (H), the guide vane opening is so controlled that a predetermined optimum can be reached, and hence the dynamo system may be operated under the input, revolution number and guide vane opening which are determined by the power control command. This ensures that the variable speed dynamo system can run with high stability and high efficiency, attaining highly economical effects.