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This paper addresses the problem of robust control design for a single-phase uninterruptible power supply by means of state feedback. Sufficient conditions are given for the existence of a robust stabilizing control gain that assures: a) the closed-loop system pole location inside a circle on the left-hand of the complex plane if the load is considered as an uncertain time-invariant or slow time-varying parameter; b) at least the stability of the closed-loop system if the load is considered as an arbitrary time-varying parameter. The robust control conditions are formulated in terms of a set of linear matrix inequalities easily solved using specialized softwares. Design examples and simulation results illustrate the method proposed.
Industrial Electronics Society, 2003. IECON '03. The 29th Annual Conference of the IEEE (Volume:3 )
Date of Conference: 2-6 Nov. 2003