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

Abstract

We consider the ${\left\{H\right\}}_2$-optimal feedback control problem, for the case in which the plant is passive with bounded ${\left\{L\right\}}_2$ 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.