Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/14042
Title: Analysis and enhancement of performance of industrial control systems
Authors: GORADIA DHARMESH BALVANT
Keywords: Control loop performance assessment; cascade control; minimum variance control; iterative PI tuning; model-free tuning; analysis of variance
Issue Date: 18-May-2004
Source: GORADIA DHARMESH BALVANT (2004-05-18). Analysis and enhancement of performance of industrial control systems. ScholarBank@NUS Repository.
Abstract: In this research work, several issues related to the industrially important simple feedback and cascade control systems are examined using the stochastic framework and minimum variance benchmark to develop suitable data based tools. Accordingly, a model free journey from tuning the existing simple feedback loop (to attain PI achievable performance) to tuning PI-P/PI-PI controllers of cascade scheme (to attain PI-P/PI-PI achievable performance) is discussed. Analysis of variance is successfully employed to deal with questions like: (i) When to use cascade control? (ii) Selection of best secondary variable from the few potential candidates for cascade scheme and (iii) Which controller (primary or secondary) to tune in the existing cascade loop to achieve the cascade achievable performance? Tradeoffs in cascade controller tuning for better stochastic and/or deterministic disturbance rejection is also discussed. Realistically simulated examples have been extensively employed throughout this study, to illustrate the workability of the proposed methods.
URI: http://scholarbank.nus.edu.sg/handle/10635/14042
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