Abstract
The old problem of designing reduced-order controllers has been addressed from many different angles. This paper offers an alternative approach to design reduced-order controllers for SISO systems. (The MIMO case is currently under development.) The new design technique lies between the two common design methods. The first common design method obtains the controller based on a reduced-order process model. The second one obtains the controller by designing a controller for the full-order process model and by then reducing the order of this controller. Unlike those two 'open-loop' methods the method presented in this paper works directly with the closedloop system during the design, thus ensuring that the reduced-order controller achieves a performance similar to that of a full-order controller. Roughly speaking, the proposed procedure computes the reduced-order controller by approximating an equivalent closed-loop state feedback system and then performing an inverse operation
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