A unified model for the analysis of FACTS devices in damping power system oscillations. III. Unified power flow controller

This paper presents the establishment of the linearized Phillips–Heffron model of a power system installed with a Unified Power Flow Controller (UPFC). Two applications based on the Phillips–Heffron model are demonstrated: 1) Study on the effect of UPFC DC voltage regulator on power system oscillation stability; 2) Selection of damping control signal for the design of UPFC damping controller.