Mid-ranging refers to control problems where there are two manipulated inputs and only one output to control. Presently, design and tuning of mid-rangin control schemes is largely done ad hoc. As a result, much time is spent devising control strategies which may work well in one application, but not nearly so well in another. To address this problem, we set out to devise a systematic approach to the design and tuning of midranging controllers. Overal, the proposed design was able to reject disturbances quicker and mid-range faster, and with less oscillation than conventional schemes. In a piot plant application, the controller performed well, achieving excellent regulation and mid-ranging despite large modellign errors. This approach may be applied to virtually any mid-ranging control application and is easily implemented on any distributed control system.
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