GA-Based Optimal PIDA Controller Design

PIDA controller has been proposed since 1996 as an extension to the conventional PID controller. The additional term "A" stands for acceleration. With this new term, a closed-loop system can respond faster with less overshoot. Originally, the design utilizes the dominant pole concept proceeded in the s-plane. As demonstrated by this article, this design approach is not suitable for high-order plants having delays and complex oscillatory modes. The article proposes an algebraic design approach which also utilizes the genetic algorithm (GA) to achieve design optimality. Comparison studies among the previous method, the gradient-search based method and the proposed approach are elaborated.