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From PTI on model REGCAU1:

• “To aid convergence we added a factor called Accel, which is a factor used only in that in the model to decide how much (fraction) of the newly calculated voltage is used in the calculation of current injection.”
• “The default value of Accel should be set to 1.0. We have tested with other values of Accel and some of our users have also used other values such as 0.8 etc.”

From a dynamics expert (developer of WECC REGC_A model)

• "I always set the acceleration factor to 0.7"

The Accelerator Factor of the REGCAU1 model is NOT an actual control setting or a physical parameter but a computational variable that users can modify to help the PSS/e convergence of the model REGCAU1 in a dynamic simulation. Based on our experience acceleration factor=0.7 is a reasonable value to use. Lower values can be used if it lead to better dynamic run performances.