Electro-thermal coupling system two-stage planning method and device considering heat supply network flow

The invention provides an electro-thermal coupling system two-stage planning method considering heat supply network flow, and the method comprises the steps: building a first-stage investment model which comprises a first target function, and enabling the first target function to be constructed with the minimization of the equipment investment cost in a planning period as a target; a second-stage operation mode model is established, the second-stage operation mode model comprises a second objective function, and the second objective function is constructed with the purpose of minimizing the equipment investment cost and the operation cost in the planning period; and setting operation environment data in a planning period, replacing the second-stage operation mode model with a corresponding KKT condition, converting the constructed overall model into a single-stage mixed integer optimization problem, and solving by using an intra-point method to obtain a planning scheme suitable for different scenes. By adopti