Mixed H2/H∞ robust control approach for NCS with uncertainties and data dropouts

Abstract

In this paper, a Robust Networked Control System (RNCS) subject to data losses constraints is considered. These data losses are modelled as an independent sequence of i.i.d. Bernoulli random variable. This random variable is replaced by an additive noise plus a gain, which is equal to the successful transmission probability in the feedback loop. Also, structural uncertainties in the model of the plant are considered.

To cope with this problem, a mixed H2/H∞ control technique is proposed in this work. In this way, the H2 approach is used to stabilize the NCS taking into account the probability of data dropouts, while the H∞ approach is in charge of making the closed-loop system robust enough against structural uncertainties of the nominal model.