Robust decentralized controller design in time domain:
Equivalent subsystem approach

Vojtech Veselý

   In this paper, the original method to design of PID robust decentralized controller is obtained for linear time-invariant large-scale uncertain system. The controller design procedure performs on the subsystem level such that the closed-loop stability and performance of complex system in the frame of the designer chosen controller design procedure (H₂, L₂ -gain, pole placement ...), is guaranteed. The proposed method is implemented in two steps. In the first step, the required dynamic properties of the subsystems are determined so as to ensure the stability of complex system. In the second step, on the subsystem level a decentralized controller design is provided using any suitable design procedure for each subsystem.

Keywords: large-scale system, equivalent subsystem method, continuous time system, robust stability, output decentralized feedback, quadratic/parameter dependent quadratic stability

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