Droop speed control

To organize a stable operation of alternating current systems, electrical power generators in the set is a static, English droop used. Of the characteristic value of the static describes the negative slope of the normalized characteristic curve f (P) or U (Q). This represents the function of the target value of the active power P of the frequency f is, or the reactive power Q by the voltage U

The value of S is static so that the ratio of frequency deviation at rated power compared to the idle and the nominal frequency:

A structural analysis is a linear regulator characteristic that describes the behavior of a generator set, depending on the network parameters such as voltage and frequency. It is used in the parallel operation of many power plants on the coordination of primary control of active power P and reactive power Q of the network size as information carriers.

The active power P is controlled in dependence on the mains frequency f, by the torque, and thus the power is increased, for example, in a turbine generator with decreasing line frequency and vice versa. The supply voltage U flows as an input variable in the control of reactive power. On the amount of the exciting current, the reactive power Q output of the synchronous generator can be adjusted. From a droop occurs when a PI controller is combined with a blind or more performance-based, linear influence of the setpoint.

Baseload plants have a large static load, peak load power plants a small static. A low -static means a flat f (P) characteristic curve, that is, even the smallest frequency deviations result in large load change reactions.