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System instability

When I start dynamic sumulation, after 0.2 sec my generator's angle start to change very sharply from 35 degrees to 1000 in 0.01 sec. But I'm not giving system any disturbances... Is it a problem of system initial instability? I mean steady state instability.

Who knows?

P.S.Power flow solved via Full newton Raphson P.S.S. I used CONL, CONG, ORDR, FACT, TYSL.