Optimal $\mathbb{H}_2$ Control with Passivity-Constrained Feedback: Convex Approach

We consider the $\Set{H}_2$-optimal feedback control problem, for the case in which the plant is passive with bounded $\Set{L}_2$ gain, and the feedback law is constrained to be output-strictly passive.

We show that this problem distills to a convex, infinite-dimensional optimal control problem, in which the optimization domain is the Youla parameter for the closed-loop system.

We devise truncated, finite-dimensional optimizations to find sub-optimal controllers, and lower bounds on the optimal objective.

Furthermore we show that both these optimizations converge to the optimal objective of the original infinite-dimensional problem as their respective domains are increased.

The idea is demonstrated on a simple vibration suppression example.