In this paper a novel distributed adaptive dual-layer super-twisting sliding mode observer-based scheme is designed
to isolate, reconstruct and mitigate the effects of disturbances and a class of communication attacks affecting both
generator nodes and load nodes in power networks. Voltage phase angles are measured at each node by ...
In this paper a novel distributed adaptive dual-layer super-twisting sliding mode observer-based scheme is designed
to isolate, reconstruct and mitigate the effects of disturbances and a class of communication attacks affecting both
generator nodes and load nodes in power networks. Voltage phase angles are measured at each node by means of
Phasor Measurement Units (PMUs). Based on this information, an interconnection of adaptive dual-layer supertwisting sliding mode observers is designed both to estimate frequency deviation in each generator node, and to
perform robust detection and reconstruction of both disturbances and a class of communication attacks. The proposed
estimation scheme exhibits a distributed structure, since it requires only information received from neighbouring
nodes and measurements taken locally in the power network. The novelty of the proposed scheme is its capability
to reconstruct simultaneous disturbances affecting the generator nodes and load nodes, automatically adjusting the
values of the gains of the observers. More precisely, the adaptive gains of the observer obey a recently proposed
dual-layer adaptation law for the super-twisting sliding mode architecture. A disturbance mitigation strategy is also
proposed at each generator node utilising the disturbance estimates. Numerical simulations are discussed to assess the
proposed distributed scheme
