A COMPARISON OF 2 DESIGN METHODS FOR PID CONTROLLERS

Analytical formulae for designing PID controllers to give specified gain and phase margins have been proposed recently in the literature. This approach is attractive as the gain margin and phase margin serve as important measures of not only performance but also robustness. Another popular approach with similar emphasis is the internal model control method. In this paper, a comparison study of these two approaches for designing a PI and a PID controller is made. The comparison shows the differences and the similarities of the two approaches. Recommendations on when and which method to apply are also given.