Impacts of wind power on large signal voltage stability of power systems with different types of loads

In this paper, dynamic voltage stability study of a wind farm integrated system is carried out and the effect of the nature of load connected to the power system buses is studied. The types of load considered for this study are constant power, induction motor and power electronic loads. Doubly fed induction generator (DFIG) type wind generator is connected to the system. The wind generator supplies some local load present near the wind farm. Therefore the effect of the nature of this local load on system stability is also studied. It is found that the system load (both existing and local) have a significant impact on the dynamic voltage stability of the system. An initial analysis is made using the P-V curves and load characteristic curves for different types of loads. Finally the study is carried out in the IEEE 14 bus and the IEEE 68 bus systems.