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Author: search.filters.author.Olranthichachat, PiyapongSubject: search.filters.subject.Genetic algorithm

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    Genetic algorithms based automatic boundary selection of robust H ∞ loop shaping pid control for DC/DC converter
    (2013-07-12)
    Olranthichachat, Piyapong
    ;
    Kaitwanidvilai, Somyot
    H<inf>∞</inf> loop shaping is complicated controller and has high order. It is difficult to implement in practice. To overcome this problem, we propose an algorithm, Genetic Algorithms based Automatic Boundary Selection (GA-ABS) of Robust H<inf>∞</inf> loop shaping control, to design a robust controller. GA-ABS is used to solve the fixed-structure H<inf>∞</inf> loop shaping. Additionally, in the proposed technique, the Boundary Selection of Genetic Algorithms, which is normally difficult to select, is determined by using GA-ABS. The performance and robustness of the proposed controller are investigated in a buck converter in comparison with those of the controllers designed by conventional H<inf>∞</inf> loop shaping and ISE (Integral Square Error) methods. Results of simulations demonstrate the advantages of a simple structure and robustness against plant perturbations and disturbances of the proposed controllers. Experiments are also performed to verify the effectiveness of the proposed technique.
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    Enhancing the performance of fixed-structure robust loop shaping control using genetic algorithm approach
    (2011-07-26)
    Olranthichachat, Piyapong
    ;
    Kaitwanidvilai, Somyot
    This paper is proposed an algorithm, Genetic Algorithm (GA) based fixed-structure H<inf>∞</inf> loop shaping control, to the problem-solving of conventional H<inf>∞</inf> loop shaping, such as high-order and difficult to be usable in general. In this approach, a structure of controller is specified combine H<inf>∞</inf> loop shaping method is solved by GA algorithm. Additionally, in the proposed technique, the desired performance weighting function, which is defined by using GA. The performance and robustness of the proposed controller are investigated in a pneumatic servo system in comparison with that of the controller designed by conventional H <inf>∞</inf> loop shaping. 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.