Deregulated environment transmission expansion planning

The Transmission System Operator (TSO) is responsible for the power system operation. It has to provide the transmission network maintenance and development, having as a goal the safety, reliable and economical operation of the power system. Additionally, it has to fulfil the environment constraints and, most important, to support the development of the interconnections. Considering the nowadays deregulated environment, the transmission network expansion (TEP) is subjected to different requests, unlike the traditional approach of the transmission network expansion. The increasing requirements of the users, sustained by the complexity of the power system development, have to be accomplished. Taking into consideration these facts, new tools and methodologies are necessary to be developed, according to the actual conditions. This paper aims to elaborate an original mathematical model used for transmission expansion planning in case of deregulated environment. In the following, a software tool is developed in Matlab, designed for probabilistic approach. The Romanian Power System is used as a case study.