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Try to use the second generation renewable model like regcau1, reecau1 instead of the wt4g and wt4e which have inherent network non convergence issues. The regc model has an angle smoothing ability which might help. You are correct in changing the dynamic simulation parameters. Other thing you can do is turn on the convergence monitor and see the bus which creates the non convergence. Please note however that if you have just some non convergence messages, it's not a big deal. Only if you have sustained non convergence messages, then you might not be able to trust your results.