ROBUST H∞ CONTROLLER DESIGN FOR A DC MOTOR SUPPLIED BY AN AC-DC POWER CONVERTER

In this paper, a robust H(infinity) controller is designed and applied to a DC motor in speed control framework. The performance and robustness aspects of controlled system related to modelling uncertainties and external disturbances are the particular attention. In a frequency formalism, the recourse to the sensitivity functions, as tool of study, leads to develop frequency templates translating the performance and robustness concepts. The H(infinity) synthesis of the controller satisfying the obtained templates is designed while using the Ricatti equations based-method. The robustness of the obtained controlled system will be examined by an unstructured analysis. In order to validate the proposed controller algorithm within a speed control application, the obtained controller was tested extensively in both simulation and hardware cases.