One of the most important factors leading to have a weak control effect in a power plant is the uncontrolled state level. This phenomenon causes to the shutdown of electricity grid and for this reason, preventing this problem could be vital in each power p lant. The steam levels are considered on two levels, the narrow and the wide steam level. In this paper an optimal controller based on linear quadratic regulator is used to control the narrow steam level. Therefore, a linear model is employed while the steam generator parameters are introduced by lookup tables from outdoor experiments. Also In this work, fractional-order PID controller as a classical controller and type 2-fuzzy as a modern controller are compared with LQR and classical PID to show the capability of the each one.

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