| 摘要 |
1,030,019. Automatic control of hydroelectric plant. DOMINION ENGINEERING WORKS Ltd. Nov. 4, 1963 [Nov.20, 1962], No. 43478/63. Heading G3R. The relative loading of two hydro-electric machines having electrical rotors associated with contra-rotating water wheels in a common water passage is automatically controlled by variation of their relative speed. As described fixed-pitch axial-flow contra-rotating water wheels 1, 2 mounted in a water passage 4 are respectively coupled through concentric shafts 6, 5 to rotors 9,11 of two dynamo-electric machines. The stators of the dynamo-electric machines are connected to a common three-phase network as shown. The lower dynamo-electric machine is synchronous and the upper is of the wound-rotor induction type. The stator currents, which represent rotor torques, are applied to a comparator 19 which controls a rotor resistance 18 associated with the upper machine so that the torque ratio is maintained at a desired value. The upper dynamoelectric machine may alternatively be of the commutator type controlled by brush shifting. Alternatively the upper machine may be a D.C. machine or a synchronous machine associated with a rectifier and inverter. Variations of the torque ratio may alternatively be detected by strain gauges associated with the transmission shafts or by the resultant swirl in the outlet of passage 4. |
