Effects of doubly fed wind generators on voltage stability of power systems

With increasing wind-power penetration, new types of generators are introduced in the power systems and their impact over the voltage stability must be analyzed. This paper is concerned with the effectiveness of voltage stability index in providing information about the proximity to instability of a power system that includes a doubly-fed induction generator (DFIG). The study is carried out over a wide range of system operating conditions by changing the level of wind power penetration and the load of the system. The Western System Coordinating Council (WSCC) 9 bus modified system is used as a test case and simulation is performed using Matlab-based toolbox (PSAT). The results show that the voltage stability of the network can be improved at low levels of wind penetration and for that conclusion a voltage stability index can be used how an important tool.