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An improved robust adaptive parameter identifier for DC-DC converters using H-infinity design

Abstract:

The paper presents the theoretical analysis, practical design considerations, and experimental verification of an improved robust adaptive parameter identifier for dc-dc power electronic converters. The proposed method improves the performance of a conventional linear switched adaptive parameter identifier by designing the observer gain using performance criteria. The design approach ensures the optimality of the observer gain as well as provides a degree of robustness to measurement noise and circuit non-idealities. We develop the design methodology for the robust adaptive parameter identifier and present experimental results that validate the achievable improvement in real-time parameter identification. The results indicate wide parameter tracking ranges (10% to 66% parameter deviations) and sub-second convergence, exceeding the performance of classically designed adaptive parameter identifiers.