Properties of Tie-Line Power Transfer Region in Interconnected Power Networks

Tie-line power exchanges play an important role in promoting the optimal utilization of power resources in interconnected power networks. An accurate description of a tie-line power transfer region guarantees the optimality and security of system operations. This paper proposes a unified method based on multi-parametric programming to capture an exact tie-line power transfer region in interconnected power networks. Different types of tie lines, including AC tie lines, DC tie lines and mixed AC-DC tie lines, can be incorporated. Furthermore, the properties of the tie-line power transfer region is analyzed. The impacts of the tie-line types and the electrical distance on the tie-line power transfer region are discussed.