From GridLAB-D Wiki
deltamode_forced_extra_timesteps - Sets the number of forced extra delta timesteps to execute before returning to staedy state.
Synopsis
#set deltamode_forced_extra_timesteps=0
Remarks
When a all delta mode object agree to return to EVENT mode, this flag forces the desired number of timesteps further in DELTA mode.
The deltamode_forced_extra_timesteps is used to catch some slower behavior in delta mode models that may be delayed in its impact.
Version
This capability is introduced in Navajo (Version 4.3).