Power supply investment planning method, device and equipment considering coal capacitance electricity price

The invention provides a power supply investment planning method and device considering coal capacitance electricity price, equipment and a medium. The method comprises the following steps: obtaining expected annual net cost and social welfare of power supply investment extension planning; constructing a bilevel planning model of power supply investment planning, the bilevel planning model comprising an upper layer planning model taking expected annual net cost minimization as an objective function and a lower layer planning model taking social welfare maximization as an objective function; an upper-layer planning model and a lower-layer planning model are solved by setting constraint conditions of a double-layer planning model for power supply investment planning, and new power supply capacity and unit quotation are taken as decision variables of the upper-layer planning model and are transmitted to the lower-layer planning model; the node marginal electricity price and the unit output serve as decision vari