673 research outputs found
Sequential Synthesis of Distributed Controllers for Cascade Interconnected Systems
We consider the problem of designing distributed controllers to ensure
passivity of a large-scale interconnection of linear subsystems connected in a
cascade topology. The control design process needs to be carried out at the
subsystem-level with no direct knowledge of the dynamics of other subsystems in
the interconnection. We present a distributed approach to solve this problem,
where subsystem-level controllers are locally designed in a sequence starting
at one end of the cascade using only the dynamics of the particular subsystem,
coupling with the immediately preceding subsystem and limited information from
the preceding subsystem in the cascade to ensure passivity of the
interconnected system up to that point. We demonstrate that this design
framework also allows for new subsystems to be compositionally added to the
interconnection without requiring redesign of the pre-existing controllers.Comment: Accepted to appear in the proceedings of the American Control
Conference (ACC) 201
A Generalized Distributed Analysis and Control Synthesis Approach for Networked Systems with Arbitrary Interconnections
We consider the problem of distributed analysis and control synthesis to
verify and ensure properties like stability and dissipativity of a large-scale
networked system comprised of linear subsystems interconnected in an arbitrary
topology. In particular, we design systematic networked system analysis and
control synthesis processes that can be executed in a distributed manner at the
subsystem level with minimal information sharing among the subsystems. Compared
to a recent work on the same topic, we consider a substantially more
generalized problem setup and develop distributed processes to verify and
ensure a broader range of networked system properties. We also show that
optimizing subsystems' indexing scheme used in such distributed processes can
substantially reduce the required information-sharing sessions between
subsystems. Moreover, the proposed networked system analysis and control
synthesis processes are compositional and thus allow them to conveniently and
efficiently handle situations where new subsystems are being added to an
existing network. We also provide significant insights into our approach so
that it can be quickly adopted to verify and ensure properties beyond the
stability and dissipativity of networked systems. Finally, we provide several
simulation results to demonstrate the proposed distributed analysis and control
synthesis processes.Comment: To be presented in the 30th Mediterranean Conference on Control and
Automation, Athens, Greece 202
Voltage stabilization in DC microgrids: an approach based on line-independent plug-and-play controllers
We consider the problem of stabilizing voltages in DC microGrids (mGs) given
by the interconnection of Distributed Generation Units (DGUs), power lines and
loads. We propose a decentralized control architecture where the primary
controller of each DGU can be designed in a Plug-and-Play (PnP) fashion,
allowing the seamless addition of new DGUs. Differently from several other
approaches to primary control, local design is independent of the parameters of
power lines. Moreover, differently from the PnP control scheme in [1], the
plug-in of a DGU does not require to update controllers of neighboring DGUs.
Local control design is cast into a Linear Matrix Inequality (LMI) problem
that, if unfeasible, allows one to deny plug-in requests that might be
dangerous for mG stability. The proof of closed-loop stability of voltages
exploits structured Lyapunov functions, the LaSalle invariance theorem and
properties of graph Laplacians. Theoretical results are backed up by
simulations in PSCAD
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