Output violation compensation for systems with output constraints

The problem of output constraints in linear systems is considered and a new methodology which helps the closed loop respect these limits is described. The new methodology invokes ideas from the anti-windup literature in order to address the problem from a practical point of view. This leads to a design procedure very much like that found in anti-windup design: first a linear controller ignoring output constraints is designed; then an additional compensation network which ensures the output limits are, as far as possible, respected, is added. As the constraints occur at the output, global results can be obtained for both stable and unstable plants.