Research on power system flexibility enhancement method based on pre-selection of structure adjustment strategy

作者：Ma, Yinghao^*; Liu, Chen; Wei, Ming; Shen, Yuming; Xie, Wei; Yang, Hejun; Zhang, Dabo; Dong, Jizhe

来源：INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS, 2024, 157: 109759.

DOI：10.1016/j.ijepes.2023.109759

• Available flexibility
• Flexibility enhancement technology
• Dynamic thermal rating
• Transmission line switching
• Unit commitment

The flexibility enhancement method of power system usually focuses on node flexible resource, without considering the transmission process. It may result in some flexible resources not being transferred, thus affecting the accuracy and effectiveness of the flexibility enhancement. In this paper, a flexibility enhancement optimization model based on pre-selection method of structure adjustment strategy is proposed, which can improve system flexibility with guaranteed availability of flexible resources. Firstly, the flexibility enhancement preselection method based on power system topology adjustment mathematical formulation is proposed to select the lines suitable for topology adjustment. Secondly, a flexibility enhancement optimization model considering economy and available flexibility is developed, which takes the maximum available flexibility index as the objective function and ensures the system flexible and economical by cost-floating constraint. The available flexibility deviation constraint corrects the system flexibility supply to guarantee the accuracy of available flexibility. Finally, the effectiveness of the proposed method is investigated through the case study on modified IEEE 24-bus and IEEE 118-bus system.