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Good control of processes with a long dead time is often achieved using a Smith predictor structure. Typically a PI or PID controller is used in this configuration. In this paper, controller design is considered for a recently proposed modified form of the Smith predictor. The design is done using the Coefficient Diagram Method (CDM) to achieve a good step response to a set point change. The proposed...
This paper presents an effective solution to the problem of stabilizing a given but arbitrary fractional-order system using a first order controller c(s)=(x1s + x2)/(s + x3). The problem is solved by determining the global stability region in the controller parameter space [x1, x2, x3] using D-decomposition technique. Analytical expressions are derived for the purpose of obtaining the stability boundaries...
This technical note presents a solution to the problem of stabilizing a given fractional-order system with time delay using fractional-order PllambdaDmu controllers. It is based on determining a set of global stability regions in the (kp, Ki, Kd)-space corresponding to the fractional orders lambda and mu in the range of (0, 2) and then choosing the biggest global stability region in this set. This...
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