Fractional order QFT controller for non-minimum phase hydro power plant

This paper presents a robust fractional order controller for non-minimum phase hydro power plants using quantitative feedback theory (QFT) based on automatic loop-shaping. In this work, a fractional-order compensator, with a flexible controller structure, is introduced into the QFT design to give a better approximation of optimum open loop in Nichols. It has been demonstrated that the fractional order controller can provide smaller high frequency gain than the integer order controller due to its extra tunable parameters.