Expanding Generator Flexibility Regions in Renewable-Rich Grid via Optimal Transmission Switching and Dynamic Line Rating

Today, power system operators face two major challenges: (۱) determining the flexibility region for generators due to the increasing penetration of renewable generation in power systems, and (۲) the rise in ambient temperature. Structural limitations in a power network and changes in its topology significantly affect the generator's flexibility region. In this paper, in addition to describing the structure of the flexibility region, the variability of these regions due to changes in the network topology is thoroughly demonstrated. For this purpose, the problem of determining the flexibility region of the generators (GFR) is integrated with the Optimal Transmission Switching (OTS) and Dynamic Line Rating (DLR) problems to develop the flexibility region and maximize the use of renewable power generation. To reduce the computational time and increase the effectiveness of the proposed method, an innovative method (referred to as Radar Scanning) is used to categorize the data related to the changes in the output power of renewable generation units. To evaluate the proposed method, the IEEE ۳۰-bus and ۱۱۸-bus power systems are employed, and the numerical results obtained from the simulation show that: first, OTS and DLR can enhance and improve the flexibility region of the generators in a power system; and second, by employing the proposed algorithm, the flexibility region of ۳۰- and ۱۱۸-bus power systems are determined by examining only a limited number of data (less than ۳۰%), resulting in a ۹۲% and ۸۹% reduction in computational time, respectively.

کلیدواژه ها:

Dynamic line rating ، Flexibility region ، Optimal transmission switching ، Renewable power generation ، Radar Scanning algorithm