Fault tolerant control for gas turbines

Abstract

This paper proposes a fault active tolerant control switching scheme with a PID's set and switching functions to manage the faults conditions. The family of PIDs which stabilizes the model in each fault condition is off-line computed following a procedure based on the signature of the closed loop rational function. To guarantee the closed loop stability between switching and reduce the number of PID's sets in the scheme a switching logic function for the controllers is selected using the LMI theory. The scheme is applied to the case of critical faults of a gas turbo generator of an electric plant, assuming the existence of a fault reconstruction system and known the multiple frequency responses of the gas turbine with four fault conditions. The comparison of a classic controller and the new scheme is shown by simulation results using real parameter of a Mexican electric plant.