Open Loop Subspace Identification of a FOPTD System

Abstract

The computation of the First-Order plus Time-Delay (FOPTD) model parameters are computed using different techniques. This type models are widely used in the industry to approximate the process models because it is easy to tune the controllers based on the model parameters. The controllers are derived from the models. The model derived from the time domain data. In this article, the closed loop system identification methods are examined. The closed loop / feedback controller is designed based on the step output data as to the original system. The closed loop identification method is executed using different set of inputs/excitation. The model obtained from the closed identification methods and it is validated using model performance metrics. This identification process is illustrated through the FOPTD bench mark system.