ABSTRACT
It happens very often in practice that a designed controller works satisfactorily in one operating regime, but not in the other. For another type of controller it could be quite contrary. For example, the PD-type controllers usually cannot maintain the steady-state accuracy if they control a static control process, while the PItype controllers can do that very well. Having that in mind, new, hybrid types of controllers can be designed. By combining different types of controllers into more complex structures, a design objective is to join good control characteristics of each controller into overall characteristics of a hybrid controller.
