EFFECT OF NONLINEAR MODAL INTERACTION ON CONTROL PERFORMANCE - USE OFNORMAL FORMS TECHNIQUE IN CONTROL DESIGN - PART I - GENERAL-THEORY AND PROCEDURE

This is Part I of a two part paper dealing with control design in powe r systems using the method of normal forms. In stressed power systems, due to the presence of increased nonlinearity and the existence of no nlinear modal interactions, there exist some limitation to the use of conventional linear control design techniques, The objective of this w ork is to understand the effect of the nonlinear modal interaction on control performance and to develop a procedure to design controls inco rporating the nonlinear information. Part II presents the numerical re sults dealing with the design procedure.