Fixed Structure Robust Loop Shaping Controller for a Buck-Boost Converter using Genetic Algorithm.

Robust controller designed by H_∞ loop shaping is complicated and its order is much higher than that of the plant. It is not easy to implement this controller in practical engineering applications. To overcome this problem, we propose an algorithm, GA based fixed-structure H_∞ loop shaping control, to design a robust controller. Genetic algorithm is used to solve the H_∞ loop shaping design problem under a structure specified controller. The performance and robustness of the proposed controller are investigated in a buck-boost converter in comparison with the controller designed by conventional H_∞ loop shaping method. Results of simulation demonstrate the advantages of simple structure and robustness against plant perturbations and disturbances of the proposed controller. Experiments are performed to verify the effectiveness of the proposed technique. [ABSTRACT FROM AUTHOR]