Automatic Weight Selection and Fixed-Structure Cascade Controller for a Quadratic Boost Converter
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In this paper, a new technique for designing a robust cascade controller for a quadratic boost converter is proposed. A single performance index in H infinity loop shaping control called stability margin is adopted as the objective function in the proposed optimization control problem; GA is used to solve this problem to evaluate the optimal controller. Necessary conditions of cascade control scheme are adopted as the constraints in the optimization problem. In addition, pre-compensator weight, which is normally difficult to be selected, is simultaneously determined with the controller. Comparative study with the conventional H infinity loop shaping is presented. Finally, simulation results verify the effectiveness of the proposed technique.
KeywordsH infinity loop shaping control Genetic algorithm Quadratic boost converter Fixed-structure robust control
This work was supported by the DSTAR, KMITL and NECTEC, NSTDA and the King Mongkut’s Institute of Technology Ladkrabang Research Fund.
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