In this paper, we propose a new technique used to design a robust controller that is not as high-order and complicated as the ones designed by conventional Η ∞ ∞ ∞ ∞ loop shaping method. To overcome the problem we proposed an algorithm called Genetic Algorithm (GA) based fixed-structure Η ∞ ∞ ∞ ∞ loop shaping control. In the approach, GA is adopted to solve the Η ∞ ∞ ∞ ∞ loop shaping design problem under a structure specified controller. The performance and robustness of the proposed controller

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... are investigated in a buck-boost converter in comparison with the controller designed by conventional Η ∞ ∞ ∞ ∞ loop shaping. Results of simulations demonstrate the advantages of the proposed controller in terms of simple structure and robustness against plant perturbations and disturbances. Experiments are performed to verify the effectiveness of the proposed technique.