Abstract—The work presented in this paper deals with the process of transfer function identification for unstable biochemical reactor. It is a closed loop test and the output from the system for a single step change with a Proportional (P) controller can be used to estimate process model parameters like steady-state gain (K), time constant (τ) and time delay (d). In this paper, we discuss the role of damping ratio (ζ) in closed loop identification with a Proportional controller. A Particle Swarm Optimization (PSO) method based PID controller tuning is also proposed for the identified transfer function model. To validate the control performance of the proposed method, it is compared with an IMC controller. The simulation result shows that the PSO algorithm can perform well in the unstable PID control system design and it improves the performance of the process in terms of time domain specifications, set point tracking, disturbance rejection, error minimization and also provides an optimum stability.
Index Terms— Step response test, PSO, PID controller, Unstable systems.
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Cite: V.Rajinikanth, K.Latha, "Identification and Control of Unstable Biochemical Reactor," Internatinal Journal
of Chemical Engineering and Application vol. 1, no. 1, pp. 106-111, 2010
