SPEED AND SURGE CONTROL FOR A LOW-ORDER CENTRIFUGAL-COMPRESSOR MODEL (REPRINTED FROM PROCEEDINGS OF THE SIXTH IEEE CONFERENCE ON CONTROL APPLICATIONS, PG 344-349, 1997)
Jt. Gravdahl et O. Egeland, SPEED AND SURGE CONTROL FOR A LOW-ORDER CENTRIFUGAL-COMPRESSOR MODEL (REPRINTED FROM PROCEEDINGS OF THE SIXTH IEEE CONFERENCE ON CONTROL APPLICATIONS, PG 344-349, 1997), Modeling, identification and control, 19(1), 1998, pp. 13-29
A model of a variable speed centrifugal compression system is presente
d. The model is based on the work of Greizer (1976), but the compresso
r characteristic is developed by modelling the losses in the compresso
r. For surge control, a close coupled valve is employed. This valve is
placed immediately downstream of the compressor, and the pressure dro
p over the valve is used as the control variable. This makes it possib
le to manipulate the shape of the equivalent compressor, consisting of
compressor and valve. The speed of the compressor is controlled with
a PI-controller. Semi-global exponential stability of the model with t
he proposed controllers is proven by the use of Lyapunovs theorem.