Research on Using Flexibility Resources to Accommodate Uncertainty in Extension Planning of Transmission System

In this paper, an expansion planning method of transmission system considering flexibility is proposed. First of all, this paper puts forward evaluation indexes for evaluating the flexibility level of power system. A specific calculation method is proposed. Next, this paper further interprets the connotation of flexibility indexes and margins, and proposes modeling methods of uncertain elements and controllable elements considering flexibility. Then, this paper proposes a bi-level programming model combining network solutions and non-network solutions. The algorithm for solving the model is described. Finally, in the analysis of examples, through comparison with the traditional robust optimization methods, the advantage of deferring investment is reflected.