FREQUENCY CONTROL DEVICE FOR A HYDRAULIC POWER PLANT WITH A LOW HEAD OF WATER

摘要

1. A frequency control device for a low-fall hydro-electric power station intended to supply an isolated grid (3), the said power station employing a turbine having a wheel with steerable blades (1) whose inclination can be controlled by a speed regulator (9) receiving a frequency signal from the turbine-alternator group (1, 2), characterised in that it is additionally equipped with an energy absorber (7) connected to the terminals of the alternator (2) under the control of the said regulator (9), the said energy absorber being capable of dissipating a maximum equal to a part (for example, 20%) of the nominal power of the group, the regulator providing it, continuously, with a "part load" instruction so that it then dissipates a fraction (for example 10%) of the nominal power of the group, which is smaller than the said maximum.