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Thank you for your answer, your answer is a good answer to how to track and identify the case of voltage instability. My doubt is that in the actual simulation, voltage instability will be found in all cases where power Angle instability occurs, but it is really difficult for me to simulate the case where voltage instability occurs and power Angle instability does not occur. Does this not really happen, or how can I tweak my simulation using PSS/E to get the case I want?