2021/08/27 by Mousavi, Shima Sadat, Kouvelas, Anastasios, Johansson, Karl H.
#FOS: Electrical engineering #FOS: Mathematics #Optimization and Control (math.OC) #Systems and Control (eess.SY) #electronic engineering #information engineering
paper · doi:10.48550/arxiv.2108.12171
In this article, a new notion of modal strong structural controllability is introduced and examined for a family of LTI networks. These networks include structured LTI subsystems, whose system matrices have the same zero/nonzero/arbitrary pattern. An eigenvalue associated with a system matrix is controllable if it can be directly influenced by the control inputs. We consider an arbitrary set Δ, and we refer to a network as modal strongly structurally controllable with respect to Δif, for all systems in a specific family of LTI networks, every λ∈Δis a controllable eigenvalue. For this family of LTI networks, not only is the zero/nonzero/arbitrary pattern of system matrices available, but also for a given Δ, there might be extra information about the intersection of the spectrum associated with some subsystems and Δ. Given a set Δ, we first define a Δ-network graph, and by introducing a coloring process of this graph, we establish a correspondence between the set of control subsystems and the so-called zero forcing sets. We also demonstrate how with Δ=0 or Δ=C\0, existing results on strong structural controllability can be derived through our approach. Compared to relevant literature, a more restricted family of LTI networks is considered in this work, and then, the derived condition is less conservative.