Genetic algorithm based fixed-structure H∞ loop shaping control of a buck-boost converter

H_infin loop shaping is a feasible method for designing a robust controller; however, the controller designed by this method is complicated and has high order. It is not easy to implement this controller in practice. To overcome this problem, we propose an algorithm, GA based fixed-structure H_infin loop shaping control, to design a robust controller. In the proposed technique, genetic algorithm is used to solve the H_infin loop shaping design problem under a structure specified controller. To compare performance, conventional H_infin loop shaping, proposed robust controller and conventional ISE method are investigated. Results of simulation demonstrate the advantages of a simple structure and robustness against plant perturbations and disturbances of the proposed controller. In this paper, the proposed technique is adopted to design a robust controller of a PCMC buck-boost converter. Experiments are performed to verify the effectiveness of the proposed technique.