Abstract
As the deregulated environment of power systems has spread worldwide, it is essential to operate power systems efficiently and economically. With the advance of communication technologies and sensors, soโcalled dynamic rating is now to be realized. Dynamic rating is a method which determines accurate ratings by utilizing realโtime information such as conductor temperatures, ambient temperatures, and wind speeds. The dynamic rating is considered to increase the thermal capacities of overhead transmission lines and therefore take on importance in the deregulated electric power industry. The importance of the dynamic rating lies mainly in the area of Available Transfer Capability (ATC) improvement. In this paper, the validity of the proposed dynamic rating application is shown from the viewpoint of ATC, especially ATC with thermal constraints. In addition, the possibilities of ATC estimations using sensitivities are verified for the purpose of reducing calculation time, considering the importance of realโtime simulation of ATC. ยฉ 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 166(4): 40โ47, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20537