ABSTRACT
This chapter proposes control topology solutions for nine common problems with a different number of sensors and actuators in the system, including cascade control, feedforward control, override control, ratio control, mid-range control, load-sharing control, split-range control, inferential control, and auctioneering control. Each control topology starts with a control challenge frequently confronted in industry. Then, the second part of each control topology develops some control topology solutions for the challenge, including additional control blocks, connections, and sometimes supplementary sensors or actuators. In all cases, once the control topology is chosen and the additional blocks are defined, a QFT robust control methodology can be applied to design the feedback controller G(s), prefilter F(s), and other additional functions. The design considers the model uncertainty of the plant, the model uncertainty of the additional blocks of the structure, and a variety of simultaneous control specifications.
