Application of Interline Power Flow Controller (IPFC) to Power Oscillation Damping

Abstract

This paper presents a study of the effect of the Interline Power Flow Controller (IPFC) on power oscillation damping and the design process of its damping controller. The power injection model of IPFC suitable for this study is developed in this paper. The damping effect of the PI controller, which is originally for constant power flow control, is evaluated first, and modal analysis of the power system is carried out. Then the pole shifting technique is adopted to stabilize the oscillatory mode having insufficient damping ratio by use of a PSS-type supplementary damping controller. The design process of the supplementary damping controller and the selection of input signal according to the mode observability are presented. Simulation results demonstrate that the IPFC with the above control system is an effective tool to damp power oscillations.