Power transmission network extension planning method, device and equipment and readable storage medium

The invention provides a power transmission network extension planning method, apparatus and device, and a readable storage medium. A fluctuation range representing output fluctuation of each microgrid can be obtained based on an interval uncertainty set. And for the micro-grid scene whose fluctuation range is not greater than a preset threshold, establishing a micro-grid capacity expansion-based power transmission network expansion planning model. And for the microgrid scene whose fluctuation range is greater than a preset threshold, taking the power grid planning cost tolerance and the constraint infeasible degree as constraints, and taking the minimum total infeasible degree as an objective function to convert the power transmission network extension planning model into a linear robust planning model. And converting the linear robust programming model into a deterministic linear programming model based on a display maximization principle. According to the method, microgrid capacity expansion and transmissi