  Dual-coupled structure is typically used to actively change the local
dispersion of microresonator through controllable avoided mode crossings
(AMXs). In this paper, we investigate the reconfigurability of perfect soliton
crystals (PSCs) based on dual-coupled microresonators. The switching dynamics
of PSCs are numerically simulated using perturbed Lugiato-Lefever equation
(LLE). Nonlinear phenomena such as solitons rearranging, merging and bursting
are observed in the switching process. Specially, for the first time, we have
discovered an unexplored $PSC$ $region$ in the microcomb power-detuning phase
plane. In $PSC$ $region$, the soliton number ($N$) of PSC state can be switched
successively and bidirectionally in a defect-free fashion, verifying the
feasibility and advantages of our scheme. The reconfigurability of PSCs would
further liberate the application potential of microcombs in a wide range of
fields, including frequency metrology, optical communications, and
signal-processing systems.
