Research – Burak DemirelJoint Design of Optimal Controller and Transmission SchedulesWe consider the joint design of forwarding policies and controllers for
wireless control loops where sensor measurements are sent over an unreliable
multi-hop wireless network to the controller node. For fixed sampling rate of the control loop,
the co-design problem separates into two
well-defined and independent subproblems: transmission scheduling for
maximizing the delay-constrained reliability and optimal control under packet loss. We develop optimal solutions for these subproblems and show that the
optimally co-designed system can be found by a one-dimensional search over
the sampling interval. Several numerical examples illustrate the power of our approach.
Supervisory Control for Networked SystemsThis work proposes a supervisory control structure for networked systems with time-varying communication delays.
The supervisor triggers the most suitable controller of a multi-controller unit based on the current networked-induced delay.
This control structure aims at improving the closed-loop control performance relative to what can be achieved using a single robust controller.
We demonstrate that stability of the supervisory control loop can be analyzed by solving a set of linear matrix inequalities.
Furthermore, we show that the state feedback gains for the multi-controller unit can be computed via semi-definite programming.
In particular, we study stability of supervisory control systems under average dwell-time switchings.
Finally, wide-area power system control application is used to illustrate the effectiveness of the proposed technique.
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