Nonlinear robust disturbance rejection controllers for rotating stall and surge in axial flow compressors

In this paper we develop globally stabilizing robust/disturbance rejection controllers for rotating stall and surge in axial flow compressors with unc ertain system dynamics and exogenous disturbances. Specifically, using the nonlinear-nonquadratic disturbance rejection optimal control framework for systems with bounded energy (square-integrable) L-2 disturbances developed in [15] and the nonlinear-nonquadratic robust optimal control framework for systems with nonlinear structured parametric uncertainty developed in [16] , a family of globally robustly stabilizing controllers for jet engine comp ression systems is developed. The proposed controllers are compared with th e locally stabilizing bifurcation-based controllers of [17]-[20] and the re cursive backstepping controllers of [21].