Abstract
Abstract The mould level control for steel continuous casting is an open research problem. In ACINOX-Las Tunas steelwork there are occasional problems with the amplitude of mould level variations and with the stability of the control system. The control quality should be better satisfied and a robust nonlinear PI controller with guaranteed robustness designed with a new NPI-RR method is proposed. This achieves a good trade-off between robustness and disturbance attenuation and also optimizing the trade-off between disturbance attenuation and control effort. The slow disturbances, related to erosion or clogging of the stopper valve and the tundish level variations, can be compensated through an adaptive scheme with gain scheduling, fuzzy logic and online identification. The simulation scale results illustrate the effectiveness of the proposal.
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