FACTS parameters optimization based on Prony analysis

WANG Ke, SONG Xiaozhe, XING Shengli

(School of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract: Aiming at the interarea low frequency oscillation of interconnected power system, an optimization method based on Prony analysis was proposed for the flexible alternative current transmission systems(FACTS) parameters optimization to improve the damping of the system. The dominant mode damping ratio derived from Prony analysis of the transmission power oscillation was introduced as the objective of the optimization model. The modes amplitude ratio constraint was also introduced and an optimization model was established. To solve the nonlinear optimization model, the improved particle swarm optimization(PSO) was adopted, in which to prevent the algorithm from being trapped into local optima, a chaos operation was introduced to improve the population diversity. To verify the effectiveness of the optimization method, IEEE 4machine11bus system was adopted for simulation. The results indicate that after the installation of static var compensator(SVC) with optimized parameters, the transient adjustment time of the tieline power flow oscillationis reduced for more than 44%, and the interarea low frequency oscillation is depressed effectively.

Key words: interarea low frequency oscillation; Prony analysis; flexible alternative current transmission systems(FACTS); particle swarm optimization(PSO); chaos operation; static var compensator(SVC)