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This is frequent on generic renewable energy models. Things to look for: a. Is the simulation converging during fault? If not, it is highly like that a spurious voltage or frequency spike occurs. Look for a way to make the simulation converging even during faulted condition. In my opinion, non-convergence during fault is still acceptable since the treatment of fault on dynamic simulation programs is a "mathematical discontinuity". However, the recovery causes spikes in frequency or voltage. b. Try to adjust network simulation time step. c. Look for adjustable filter time constants in the model. You may want to reduce this so high frequency spikes will be eliminated.