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A Diagnosis Method of Inverter Anomalies under DoS Attack Based on Interval Sliding Mode Observer

To improve the robustness and accuracy of cyber-physical system fault diagnosis, a diagnosis method for DoS (denial of service) attacks of inverters based on interval sliding mode observer is proposed in this paper. The mixed logical dynamic (MLD) model of the inverter is established by using the current flow direction of the switch under normal working and DoS attacks conditions. A current interval sliding mode observer is designed, which is constructed via a convex weighted sum of the current estimators of the upper bound sliding mode observer and the lower bound sliding mode observer. The designed observer is then used to estimate the normal three-phase current value of the inverter. The current residual which is obtained by comparing the current from the actual system and the observer is used to detect DoS attacks. The residual information table is established according to the attacked information contained in the residual to perform attacked location. The designed current interval sliding mode observer can not only improve the convergence speed of the interval observer, but also reduce the chattering effectively and improve the robustness of the cyber-attacks diagnosis system.