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| Nonlinear control is a prevalent subject for control engineers, but whether or not a nonlinear controller must be used for a nonlinear system should be considered before attempting. In this paper, gap metric is used to tackle this issue for a benchmark boiler. It is shown that the boiler shows severe nonlinearity, but the nonlinearity can be avoided by careful choice of the operating range. A single linear controller can be designed to work in such an operating range. Simulation results are given to verify the conclusions. |
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| Keywords:Nonlinear control, Gap metric, Robust control, Boiler |
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