Abstract
In this paper we show that the traditional methods of analyzing cascade control (based on series or parallel input/output relationships) should not be used when the primary and secondary processes are coupled, and the process is open-loop unstable. The connection between cascade control and traditional state feedback control is studied. In addition, we develop a cascade control system methodology which incorporates a specified inner-loop controller in the outer-loop controller design. This cascade control design procedure is compared to a conventional cascade control design procedure and to a noncascade control strategy.
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