Abstract
The standard LQ regulator is known to have the excellent robustness. However, it is insufficient especially for the large-scale complex system, where the high-frequency unmodelled uncertainty exists. This paper proposes an optimal regulator with low-pass property, which has the stability robustness against such a class of uncertainties, The controller is designed based on the formulation as a frequency-shaped regulator problem. Its realization method and characteristics are also studied. The algorithm is applied to LSS (Large Space Structures) control to clarify its capability to suppress the spillover instability caused by the residual modes which are neglected at the controller design phase.
