A mixed integer linear programming model for transmission expansion planning with generation location selection

This paper presents a mixed integer linear programming model for single stage least cost transmission expansion planning that considers generation plant location selection. The model includes DC load flow equations and (N-1) security constraints. The non-linearity of the load flow equations is avoided by using a new state enumeration method that reduces the size of the model formulation. Methods are developed for identification of the critical contingencies of a network and formulation of security constraints of the identified critical contingencies by using line outage distribution factors. The number of variables and constraints in a transmission planning model would be reduced considerably by using these methods. Such a reduction would help to handle relatively large transmission planning problems and incorporate more technical considerations. A case study of the Sri Lankan power system is conducted in order to illustrate the potential of the new approach.