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Hello Everyone,

I am currently working on a user defined model and had a question pertaining angle and frequency calculation. At the moment I have gotten acceptable responses during a three phase fault in which the power and voltage goes down. What I don't understand is that my frequency goes down when it should go up. The system is composed of an infinite bus, a POI bus and my generator representation with the user defined model. I look at other generator representations in place of mine and see that the frequency goes up immediately during the fault. MY model has the frequency go down. Similarly, the angle is the reciprocal of mine during the fault (it is swinging the exact same, but opposite). My current injection seems sound, but the frequency/angle response is not. I have matched the waveforms between my model and others pre fault and they match. It seems like a simple sign error, however this does not seem to be the case as any changes distorts either the initial condition or fault response behavior. I'm wondering how the bus angle starts progressing opposite of other models. Any help would be great. Thanks!