Improvement of methods for long-term transmission systems expansion in current conditions

Currently, Russian power sector has switched to the market model for controlling electric power industry functioning and development. Due to a need to consider numerous specific features characteristic of the market-based industry, modern criteria for designing electric networks should obviously differ from the criteria of “planned economy” approach. The paper considers new method for long-term transmission expansion problem (TEP) based on solving number of optimization subproblems with a system of mathematical models. The models allow taking into account set of technical and economical factors. The proposed method is practically applied to the problem of Russian Unified National Energy Grid (UNEG) expansion.