Applications of ripple correlation control of electric machinery - Electric Machines and Drives Conference, 2003. IEMDC'03. IEEE International

Abshacr Ripple correlation control can be applied to electric dr*e system in order to optimize some cost function independent of parameters. Tbis involves correlating the perturbations in the cost function with the perturbations in the independent variable to obtaim a command for the independent variable. The perturbations are normally due to ripple that is naturally prewnt in electric drive systems. In the steady state, tbe fast-average value of the independent variable converges asymptotically to a point no more than the maguitude of the ripple away from the optimum set point In certain applications, cost function observers must be created to obtain the correct correlation information. In this paper, ripple correlation control is developed and demonstrated for de, induetion, and brushless dc drives.