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Hello everyone, I have simulated the sample of transient voltage instability in IEEE 39 system with transient power Angle instability through PSS/E. Now, I want to simulate transient voltage instability without transient power Angle instability. Can you give me some advice to help me simulate such a sample? In fact, what I want to study is the coupling of transient power Angle instability and transient voltage instability, and how to distinguish which instability will occur first. At present, the known situation is that when the transient power Angle instability occurs in the power system, the transient voltage instability will certainly occur, which makes me have some doubts about the direction of research, whether it is actually the transient power Angle instability that will occur first.