Achieving benefits using traditional control technologies

Abstract

The basic techniques of cascade and feedforward control are described together with the types of process problem to which they are suited. Their use is illustrated with simple examples. Among these are three-element level control, heat exchanger control and distillation control. The latter example quotes the magnitude of the benefits which can be achieved in practice. Other areas where traditional techniques can be used are given. Amongst these are override controls with an illustration from distillation control, 'valve position control' with an example from a fired heater system and the use of calculated variables demonstrated by heat input control.

A Min-Max selector controller for turbofan engines with improvement of limit management and low computational burden

“…The output from the Min-Max algorithm is the fuel flow rate signal that causes that the thrust command will be provided, and none of the operational and safety limits will be violated (Decastro et al, 2008; Garg, 2013; Jaw and Mattingly, 2009; Litt et al, 2009; Montazeri-Gh and Jafari, 2011; Spang and Brown, 1999). In addition to aircraft engine, the Min-Max selector control scheme can be used to control many other constrained systems such as industrial gas turbine engines (Mohammadi and Montazeri-Gh, 2016), distillation towers for temperature control (Oglesby, 1996), Anti-Windup systems (Kothare and Morari, 1999), electric motors, power industry for control of boilers, power systems, and nuclear reactors (Glattfelder and Schaufelberger, 2003).…”