In this paper,a variable structure online controller tuning strategy is presented in a parametric controller architecture in order to facilitate field commissioning of controllers.The structure consists of a nominal coarse-tuning controller and a set of fine-tuning candidates,which assists in the adjustment of the controller in real-time without affecting the closed-loop stability at the same time.During the design process,two steps are involved:the first step is to develop a coarse-tuning controller that satisfies the robust stability of the closed-loop system as well as the nominal performance of the system.Secondly,a real-time fine-tuning mechanism is constructed with the use of Youla parameters under an arbitrary switching strategy,coupled with an array of online tunable controllers.To ensure the stability of the fine-tuning device under arbitrary switching,a quadratic stable state space for the switching subsystem will be developed to ensure that it remains stable when switching is arbitrary.The effectiveness of the proposed method is then verified by a simple simulation example.
parameterizationstability of linear systemslinear systemsswitched systemsrobust control
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