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Optimal restricted structure control with prespecified gain or phase margins

Grimble, M.J. (2004) Optimal restricted structure control with prespecified gain or phase margins. IEE Proceedings Control Theory and Applications, 151 (3). ISSN 1350-2379

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Abstract

Restricted structure controllers have previously been defined, where the controller structure and order are predefined. These enable a cost-function to be minimised to obtain the best controller tuning parameters; however, the gain and phase margins were incidental. A constrained optimisation method is proposed that enables specified gain or phase-margins to be achieved. In fact, these robustness margins are generalised and the optimisation method enables them to be achieved exactly, but at the price of a cost increase.