Design of memoryless output feedback controller of discrete-time systems with input delay

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Design of memoryless output feedback controller of discrete-time systems with input delay

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This study addresses the output feedback stabilisation problem of discrete-time linear systems with input delay. By viewing the difference between the current input and the delayed input as a special disturbance, full- and reduced-order extended state observers are constructed, respectively, to estimate both the state and the disturbance simultaneously. Then the composite control laws are synthesised to actively compensate the input delay by using the state and disturbance estimates. Different from existing predictor-based control approaches, the proposed controllers are memoryless, and the past input information are thus not needed. Moreover, it can be observed that the information on the size of the input delay is not involved in either the observers or the controllers. Finally, simulation results are provided to illustrate the advantages and effectiveness of the proposed approaches.

Inspec keywords: compensation; reduced order systems; observers; feedback; control system synthesis; memoryless systems; delays; linear systems; stability; discrete time systems

Other keywords: delayed input; current input; state estimation; discrete-time linear systems; reduced-order extended state observers; full-order extended state observers; composite control law synthesis; disturbance estimation; memoryless output feedback controller design; input delay compensation; output feedback stabilisation problem

Subjects: Simulation, modelling and identification; Discrete control systems; Stability in control theory; Control system analysis and synthesis methods; Distributed parameter control systems

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