Main and distribution collaborative planning method and system of power grid total cost chain

The invention belongs to the field of power grid cost planning, and provides a main and distribution collaborative planning method and system for a power grid total cost chain, and the method comprises the steps: constructing a power grid cost chain optimal planning model based on the initial investment cost of a power grid and the operation cost of the power grid, obtaining pollution degrees and production gains of different power plants, optimally selecting construction investment costs of the different power plants, and summing the optimally selected construction investment costs of the different power plants to obtain an optimal initial investment cost of the power grid; constructing a broken line graph based on the power generation power cost, the power generation scheduling cost and the power transmission line construction investment cost, selecting the optimal power grid operation cost based on the broken line graph, and substituting the obtained optimal power grid initial investment cost and the optim