| 摘要 |
A machine set (1) consists of a water-driven turbine (11) and a generator (12) coupled thereto. The generator feeds a network of constant frequency (3) via a frequency-controlled converter (2). The speed reference value (n*) of the machine set is given by means simulating turbine characteristics (4) in dependence on two characteristic quantities (ao or PHI ) with optimum efficiency and is finely optimized (n) preferably by a maximum power-point control (5). The upper and lower water level (Lu, LH) can be preset, in a single or double-action controlled turbine (11) additionally by a control device (6) if one of the two characteristic quantities (ao or PHI , respectively) is used as a control signal for the nozzle orifice or the aperture at the guide wheel or rotor. Advantageously, in the case of the double-controlled turbine, the characteristic quantity not needed for the level control is slaved as a further control signal with the optimum efficiency, and the characteristic quantity used for the level control is limited. |
