Stoustrup, Jakob2; Niemann, Hans Henrik3; Shafai, B.4; Uddin, V.4
1 Department of Mathematics, Technical University of Denmark2 Department of Applied Mathematics and Computer Science, Technical University of Denmark3 Department of Electrical Engineering, Technical University of Denmark4 unknown
In this paper the problem of optimal QTR H-infinitynorm approximation of an LTR controller with specified poles isconsidered. A structurally predefined fixed order LTR controller isintroduced which has the same dimension as the number of transmissionzeros. It is shown that the design problem can be reduced into anequivalent convex optimization problem involving LMI which can be solvedefficiently. We demonstrate the performance of this LTR controller bycomparing it to a functional observer based LTR controller of the samedimension.