| 摘要 |
PURPOSE:To detour the counter-flow region, when increasing the input of a motor to be coupled with a pump, by sustaining the opening of a guide vane for a predetermined time after an input incremental command is received and increasing the opening of a guide vane after the rotary speed has increased to a predetermined level. CONSTITUTION:A reversible pump-turbine 3 is provided with a reversible pump- turbine body 6 coupled to the rotary shaft of a generator/motor 5 wherein the rotary speed of the motor 5 and the opening of a guide vane are controlled by a governor 2 in accordance with a target value produced from a function generator 1. The function generator 1 produces a target value in accordance with a head H in the power station and a required motor input P from a power system. When said input P is increased, a decision unit 4 will produce an initial opening of guide vane Y1 and sustain the opening until the difference between a target rotary speed N0 and an actual rotary speed N of motor will decrease below an allowable rotation (epsilon). When the difference decreases below (epsilon), a target opening Y2 of guide vane is produced so as to increase the opening of guide vane.
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