Improved Decentralized PID Controller design for MIMO Processes

Abstract

In this paper, improved design of a decentralized PID controller for the multivariable time delay processes is proposed. In this method, the Haalman method is extended for each single input and single output process. The method is based on keeping the open loop transfer function same as that required for an integrating with time delay transfer function model. The method does not involve any tuning parameter. The design of MIMO PID controllers is based on detuning only the proportional gain. The controller performance study has been carried out on three multivariable stable transfer function models. The proposed method provides better closed loop performances for the perfect and uncertainties in the process model parameters compared with the recently reported methods. The closed loop performances are assessed in terms of Integral Square Error (ISE), Integral Absolute Error (IAE) values and Total variance (TV).