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Paper details
Number 1 - March 2020
Volume 30 - 2020
Fault tolerant multicontrollers for nonlinear systems: A real validation on a chemical process
Sondess Mejdi, Anis Messaoud, Ridha Ben Abdennour
Abstract
An active sensor fault tolerant controller for nonlinear systems represented by a decoupled multimodel is proposed. Active
fault tolerant control requires accurate fault estimation. Thus, to estimate both state variables and sensor faults, a discrete
unknown input multiobserver, based on an augmented state multimodel, is designed. The multiobserver gains are computed
by solving linear matrix inequalities with equality constraints. A multicontrol strategy is proposed for the compensation
of the sensor fault and recovering the desired performances. This strategy integrates a bank of controllers, corresponding
to a set of partial models, to generate a set of control laws compensating the fault effect. Then, a switching strategy
between the generated local control laws is established in order to apply the most suitable control law that tolerates the fault
and maintains good closed loop performances. The effectiveness of the proposed strategy is proven through a numerical
example and also through a real time application on a chemical reactor. The obtained results confirm satisfactory closed
loop performance in terms of trajectory tracking and fault tolerance.
Keywords
multicontroller, experimental validation, transesterification reactor, discrete unknown input multiobserver, fault tolerant control, sensor fault estimation