Abstract

In this paper, the authors are willing to study the effects of unified power flow controller (UPFC) on voltage support and also stability enhancement at a multi-machine electric power system. Proportional-Integral (PI) type controllers are considered for UPFC control and the parameters of these PI type controllers are tuned using simulated annealing (SA).  In order to show the ability of UPFC in voltage control and also stability enhancement, the results of the system with UPFC are compared with the results without UPFC. Nonlinear time domain simulation results emphases on the ability of UPFC in simultaneous control of voltage and also stability enhancement

Key words: Unified power flow controller, voltage support, dynamic stability enhancement,multi-machine electric power system, simulated annealing.

Abbreviation

FACTS, flexible AC transmission systems; UPFC, unified power flow controller; SA, simulated annealing; LFO, low frequency oscillations;