Nonlinear analysis of inter-area oscillations: Effect of SVC voltage support

Abstract

Nonlinear modal interaction between system modes is known to contribute to different properties in physical processes. This paper discusses the experience in the use of perturbation theory to study nonlinear system performance in stressed power transmission networks that include multiple flexible a.c. transmission systems controllers. First, an analytical derivation is developed which is used to investigate the effect of static VAR compensators (SVCs) on system nonlinear dynamic behavior. Normal form theory is then applied to study nonlinear modal interaction between SVC control modes and inertial modes. The proposed procedure is demonstrated on the WSCC 4-areas test system. Results of the second-order normal form study are presented and techniques for implementing each phase are discussed. © 2002 Elsevier Science B.V. All rights reserved