부산대학교 도서관

Since static var generators (SVG) have the advantages of rapid reactive power compensation and flexible control, they have been widely applied in large-scale wind power grid-connected systems. A large number of studies have shown that SVG can improve the grid-connected stability of wind farms, but its mechanism is not clear. Aiming at the droop control strategy, the mechanism of SVG improving the electromechanical transient stability of converter is analyzed in this paper. And then, considering the coupling of voltage and frequency control loop of droop converter on time scale, the traditional electromechanical transient analysis method will have large error in calculating the stability region. Therefore, the full-order dynamic model of the Droop-SVG system is established, and the stability region is estimated by using the T-S fuzzy model method, which quantitatively proves that SVG can improve the transient stability of the droop converter. Finally, the influence of main parameters on stability is investigated. Simulation proves the correctness of the theory.