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It seems that the code updates the total load (with forecasting values). This process creates an unbalanced between generation & load, leading to progressive non-convergence since by default, the swing generator will take the delta of the MW unbalance, getting 'stressed' on higher loading. It is better to re-dispatch a group of generators after each increase in load but before a load flow solution. The re-dispatch will aim to keep all generators within their generating capabilities.

As a test, try to reach the new system load incrementally, not 'at once'

It seems that the code updates the total load (with forecasting values). This process creates an unbalanced between generation & load, leading to progressive non-convergence since by default, the swing generator will take the delta of the MW unbalance, getting 'stressed' on higher loading. It is better to re-dispatch a group of generators after each increase in load but before a load flow solution. The re-dispatch will aim to keep all generators within their generating capabilities.

As a test, try to reach the each new system load loading incrementally, not 'at once'