Feasible Region of Transmission Sections: Weak Factors Identification and Expansion

Feasible region limitation of transmission sections hinders the resource complementarity among regional power networks and the accommodation of renewable energies. To expand the feasible region of transmission sections, this paper proposes an optimization planning method with weak factors identification. In the method, the feasible region of transmission sections is characterized based on multi-parametric programming considering the operational constraints of power systems. Then, based on the characterized feasible region, a weak factors identification method is proposed to capture the critical factors limiting the feasible region of transmission sections, such as specific transmission capacity constraints of lines and minimum output constraints of generators. Furthermore, an optimization planning model for upgrading the identified transmission lines and generators is constructed. With weak factors identification, the planning model can avoid traversing all transmission lines and generators and significantly reduce the computational burden. The effectiveness of the proposed method is demonstrated on IEEE 30-bus and 118-bus systems.