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Offshore Wind not converged

asked 2018-11-13 10:41:50 -0500

ffl gravatar image

I'm doing dynamic simulation with offshore wind modeled as WT4G1 and WT4E1 connected to the ac system via VSC HVdc Light Model. During 6-cycle fault and after fault clearing with tripping, network not converged is displayed.

So far I've tried several turnarounds: increased iteration limits, used 1/8th of a cycle as time step, reduced acceleration factor to 0.1 and reduced fault MVA. Note that the location of fault is two bus away from the converter side in the ac system.

I would like to see suggestions in this group in order to help me fix the problem. Thanks.

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answered 2018-11-30 19:15:01 -0500

txc gravatar image

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.

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Asked: 2018-11-13 10:41:50 -0500

Seen: 253 times

Last updated: Nov 30