For access to this article, please select a purchase option:
Buy conference paper PDF
Buy Knowledge Pack
IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.
This paper analyzes the impact of unified power flow controller (UPFC) on power system low-frequency oscillation characteristics. A single-machine infinite-bus system containing UPFC is adopted and analyzed in this paper. To reveal the essence of the impact of UPFC on system low-frequency oscillation characteristics, UPFC controllers are assumed to be ideal. Under this assumption, the equivalent model of the system is derived, and the low-frequency oscillation characteristics of the system are analyzed. Furthermore, the characteristics of the system under different operation conditions are studied. Theoretical analysis shows that the synchronous torque coefficient of the system is changed afer the UPFC is installed, and this leads to the change of system low frequency oscillation characteristics. Time domain simulations are then conducted to validate the conclusions obtained by the theoretical analysis. Simulation results show that the analysis conclusions can accurately reflect the low-frequency oscillation characteristics of the system and clearly explain the influence mechanism of UPFC on system oscillation characteristics.