Controller Reduction Via a New Double-Sided Frequency Weighted Model Reduction Formulation

In this paper, the solution of controller reduction problem via double-sided frequency weighted model reduction techniques is considered. A new method for deriving the frequency weights based on closed-loop system approximation criterion is proposed. The formulas of frequency weights are obtained in terms of the plant and the original controller and a free parameter. By varying the free parameter in the resulting two-sided frequency weighted model reduction problem, frequency weighted error can be significantly reduced to yield more accurate low-order controllers