Disturbance Rejection of Distillation Column Using Multiloop Nonlinear Adaptive PID Controller

In this paper we present an enhanced adaptive PID controller tuning for multivariable systems with concerning load disturbances. Attention of load disturbances is of primary concern for process control and set point following is often less important. An auto tuning neuron which provides 3 adjustable parameters is used to adjust gains of the multivariable PID controller, which is tuned on-line according to improved adaptation laws and accurate implementation. Simulations show the effectiveness of tuning scheme and better disturbance rejection.