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State space control system design based on non-minimal state-variable feedback: further generalisation and unification results.

Research output: Contribution to journalJournal article

Published

Journal publication date09/2000
JournalInternational Journal of Control
Journal number14
Volume73
Number of pages17
Pages1329-1345
Original languageEnglish

Abstract

This paper shows how proportional-integral-plus linear-quadratic (PIP-LQ) control, based on non-minimal state space (NMSS) control system design, can be constrained to yield exactly the same control algorithm as both generalized predictive control (GPC) and standard, minimal state, linear quadratic gaussian (LQG) design methods. However, while NMSS includes these other approaches as special cases, it is less constrained and so more flexible in general terms: for example, while PIP-LQ has the simplicity of GPC, it is formulated like LQG in the powerful context of state variable feedback (SVF) control, which allows for ready access to modern robust control methods. Furthermore, the paper suggests that the NMSS approach provides the greater design freedom, with a wider range of possible LQ solutions than its minimal state space equivalent.