Abstract
A large signal voltage stability index is proposed in this study. Although the study focuses on a wind farm connected system, the index can predict instability of any power system. The index gives an idea about the stability margin of the power system under a given operating condition and can be used to predict emergency situations following a large disturbance such as line outage. The proposed index can be used effectively for systems with static as well as dynamic loads. The proposed index is verified in standard test systems. Matrix perturbation theory is used to verify the viability of the index.
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