A comprehensive long-term power distribution system expansion planning model

A new long-term power distribution system expansion planning model is developed. The model includes accurate representation of the different nonlinear planning cost functions. The cost of expanding an existing substation by adding transformer units is also included in the planning cost formulation. Moreover, power-conservation, voltage-drop and equipment-capacity constraints are explicitly included in the planning problem formulation. The developed model is illustrated using a numerical example and is rested for both efficiency and accuracy.