New results for H2 state feedback control of large-scale systems

In this paper, H2 state feedback control for large-scale systems is studied in a different approach from the existing methods. The attention is focused on the design of a near-optimal H2 controller which does not depend on the values of the small unknown weak coupling parameter. It is newly shown that the resulting controller in fact achieves O(ε²) approximation of the optimal H2 cost.