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Numerically non-convergence conditions due to switching back & forth of capacitors or adjusting transformer taps or conflicting voltage control objective of generators need to be cleared first. Next, check that total generation and load, in P and Q, are close enough so the swing unit could resolve the unbalance.

Find a previous case that converged, compare them to find the significant differences and adjust accordingly. For example, if there is too much load in the non-converging case, consider reducing it to a level that you can converge again and then perform a PV study to find the maximum load to increase before reaching non-convergence.