English title

Transmission system is one of the most important parts of the restructured power system. Insufficient or inappropriate expansion of transmission system is considered to be a major barrier to competition in electricity market. Therefore many researches have been focused on developing suitable approaches for transmission expansion planning in deregulated power systems.
This paper presents a new approach for transmission expansion planning in long term based on dynamic modeling while the method is based on the maximization of the social welfare; it also considers the view point of system policy maker through weighting generating units. The suggested method can be efficiently used for systems which are in the way of experiencing restructuring. The suggested method is tested on IEEE 14-bus system and the results are discussed.