Small signal stability analysis of power systems with DFIG based wind power penetration

With the increasing penetration of wind power generation into the power system, it is required to comprehensively analyze its impact on power system stability. The present paper analyzes the impact of wind power penetration by doubly fed induction generator (DFIG) on power system oscillations for two-area interconnected power system. The aspects of inter-area oscillations which may affect the operation and behaviour of the power systems are analyzed with and without the wind power penetration. Eigenvalue analysis is carried out to investigate the small signal behaviour of the test system and the participation factors have been determined to identify the participation of the states in the variation of different mode shapes. The penetration of DFIG in a test system results in an oscillatory instability, which can be stabilized with the coordinated operation of automatic voltage regulator (AVR) and power system stabilizer (PSS) equipped on synchronous generators. Also, the variations in oscillatory modes are presented to observe the damping performance of the test system at different wind power penetration level.