Building a new power system with renewable energy as the main body is an important measure for carbon neutralization and carbon peaking. Aiming at the unique characteristics and cost model of renewable energy

in the current multi-level dispatching plan coordination mode of large power grid in China

a bottom-up multi level dispatching plan preparation schemeis designed in order to avoid the lack of consideration of provincial grid constraints based on power transactions in the preparation of cross regional and cross provincial tie-line plans

which may lead to the convergence of provincial grid plans and require repeated circulation and modification. Considering the renewable energy accommodation

the tieline plan is taken as an adjustable decision variable

and considering the operation constraints

the limit capacity analysis model of provincial network transmission or acceptance is established to solve the boundary conditions of the tieline plan. Finally

according to the boundary conditions

the tie-line plan meeting the provincial network constraints is compiled. The effectiveness of the proposed method is verified by an actual power grid example.