There exist two different strategies in model predictive control (MPC)

i.e.

set-point control and zone control.In comparison

zone MPC is thought to be a better strategy.However

there exists an improved set-point control strategy

i.e.

double-layered MPC

which computes set points through the steady-state target calculation in the same control cycle.In this paper

from the aspect of process steady state

the principles of zone control and double-layered MPC are analyzed.We discuss the differences and similarities between the two strategies both qualitatively and quantitatively

and prove that the two strategies are consistent in a certain context.Simulation results are given to validate the conclusion.