For the energy flow with the transmission delay property participating in the power grid dispatching

its departure and arrival time are often directly rounded to adapt the classical hourly day-ahead dispatching system

resulting in large errors of the optimization results. Meanwhile

if the scheduling time unit is refined and then rectified

the number of the optimization variables and solution pressure will increase significantly. Therefore

a new microgrid optimization scheduling model which can adapt the day-ahead scheduling system was established in this paper

and it is applied to the energy economic scheduling of pelagic clustering islands. Firstly

considering the energy flow between islands based on the electric vessel（EV）

the comprehensive influence of the environmental factor field on energy supply-transmissiondemand was quantitatively analyzed. Furthermore

an inter-island energy transfer model compatible with differential delay time was established. On this basis

to solve the non-integral point problem of inter-island energy flow transmission delay

a microgrid optimal scheduling strategy adapting to the day-ahead scheduling system was proposed. Finally

the fast group search optimizer algorithm was used to achieve the efficient solution. The simulation results verify the rationality and feasibility of the proposed strategy.