In this paper a graphical design method is introduced for finding all proportional integral (PI) controllers that stabilize a single area non-reheat steam generation unit for a range of plant parameters. This problem is solved by finding all achievable PI controllers that robustly stabilize the system. Additive uncertainty modeling is used to describe the uncertain perturbed system. A key advantage of this procedure is that it depends only on the frequency response of the system and does not require the plant transfer function coefficients.

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