Control Structure Selection For The Alstom Gasifier Benchmark Process Using GRDG Analysis

The objective of this work is to explore the disturbance rejection capability of possible multi-loop control structures for the ALSTOM gasifier benchmark process and selecting the appropriate control structure. Generalized Relative Disturbance Gain (GRDG) analysis is used for control structure determination. In order to carry out GRDG analysis, process models in the form of transfer functions are obtained from the discrete time models identified using the Output-Error (OE) method for system identification. Models identified with the OE method can provide accurate long range prediction (or simulation) performance and, hence, lead to accurate transfer function models. The GRDG analysis results clearly show that the baseline controller proposed by Asmar et al. (Asmar et al., 2000) is the favoured multi-loop control structure among their initial designs. This study provides explanation for the reason behind the impressive performance of the ALSTOM baseline controller that is not available before

Control Structure Selection for the ALSTOM Gasifier Benchmark Process using GRDG Analysis

Exploring the disturbance rejection capability of possible multi-loop control structures for the ALSTOM gasifier benchmark process and selecting the appropriate control structure are presented in this paper. Generalised relative disturbance gain (GRDG) analysis is used for control structure determination. In order to carry out GRDG analysis, process models in the form of transfer functions are obtained from the discrete time models identified using the output-error (OE) system identification method from the simulated process operation data. Models identified with the OE method can provide accurate long range prediction (or simulation) performance and, hence, lead to accurate transfer function models. The GRDG analysis of four control schemes proposed by Asmar et al. (2000) clearly shows that the control structure employed by the baseline controller is the most favoured multi-loop control structure. This study provides explanations for the impressive performance of the ALSTOM baseline controller that were not available before