We consider an application-oriented nonlinear control of centrifugal
compressors. Industrial applications require the compressor system to adjust to
variable process demands and to be restricted to the valid operation range
(e.g. surge limit). We modify a compressor model of Gravdahl and Egeland to
account for characteristic features of industrial compressors and combine the
framework of nonlinear output regulation via the internal model principle with
MIN/MAX-override control in order to implement trajectory tracking between
given state constraints. Furthermore the switching scheme as well as the
practical stability of the closed-loop MIMO system is analysed by the
corresponding switched and impulsive error system. The override control is
demonstrated by applying discharge pressure control, anti-surge control and
maximum discharge pressure limitation