Model predictive control and stabilisation of interconnected systems
- Publication Type:
- Thesis
- Issue Date:
- 2011
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The attraction of having higher efficiency and quality, as well as increasing reliability
and flexibility for industrial plants and network systems has created opportunities
for new research in the control and optimisation fields. Among various design
methods, model predictive control (MPC) strategies have proved to be effective in
industrial applications. Whilst found widespread used with stand-alone controllers
in the refining and many other industries, the field of orchestrating non-centralised
MPCs and distributed MPCs is evaluated as still in its infancy.
The work in this thesis is concerned with stabilising methods for the control of
complex interconnected systems with mixed connection configurations employing distributed
and decentralised model predictive control schemes. Inheriting the advantage
of the MPC strategy, the control and state constraints are naturally dealt with by
the employed methods. As a result, the novel concept of asymptotically positive realness
constraint (APRC) and the segregation and integration constructive methods for
the constrained stabilisation of interconnected systems are introduced and developed.
The MPC is formulated with state space models and stabilising constraints within the
open-loop paradigm in this thesis. By having the control inputs entirely decoupled
between subsystems and no additional constraints imposed on the interactive variables
rather than the coupling constraint itself, the proposed approaches outreach
various types of systems and applications. For parallel connections that emulate parallel
redundant structures and have unknown splitting ratios, a fully decentralised
control strategy is developed as an alternative to the hybrid approaches. For the
semi-automatic control systems, which is involved with both closed-loop and humanin-
the-loop regulatory controls, the stability-guaranteed method of decentralised stabilising
agents which are interoperable with different control algorithms is germinated
and implemented for each single subsystem.
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