Abstract
The modal analysis method is utilized to study the influence of doubly-fed induction generator (DFIG) on electromechanical oscillations. On this basis, the small signal stability region (SSSR) of power systems with DFIG in injection space is evaluated and the corresponding relationship between SSSR boundary and electromechanical oscillations is analyzed. The effects of the locations of DFIG on SSSR are considered. It is found that the boundary of SSSR consists of several smooth surfaces, which can be approximated with hyper-planes in engineering application. With the integration of DFIG, SSSR becomes smaller, thus indicating the deterioration of the small signal stability of the system. The 11-bus system with four generators is used to illustrate the proposed method.
Highlights
In recent years, with the significant increase of wind power penetration in power systems, the influence of the doubly-fed induction generator (DFIG) [1] on small signal stability of power systems have attracted more and more attention
Problems like the impact of wind power integration on power system security region, and whether the security region method can be applied to the security and stability analysis as well as power system monitoring with wind power deserve further study
This paper investigates the influence of DFIG on electromechanical oscillations
Summary
With the significant increase of wind power penetration in power systems, the influence of the doubly-fed induction generator (DFIG) [1] on small signal stability of power systems have attracted more and more attention. In [2], an analysis on small signal stability of a power system with DFIG was performed considering the influence of rotor speeds and stator resistances. This paper investigates the influence of DFIG on electromechanical oscillations. On this basis, the small signal stability region (SSSR) of the power system with DFIG is calculated, and the relationship between SSSR boundary and electromechanical modes and the influence of DFIG on SSSR are analyzed. The 11-bus system with four generators is used to illustrate the proposed method in the paper
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