A novel algorithm for ATC calculations and applications in deregulated electricity markets

In this new deregulated environment, transmission networks should be regulated to ensure a competitive, open, and reliable market, which relies on the implementation of many transmission assessment functions. Among them, a key concept is the ability to quantify accurately and rapidly the capabilities of the transmission system. Accurate ATC values on major interfaces of the system can provide an important index to evaluate system security and reliability.The main contribution of this paper is to propose a novel algorithm for contingency ATC computation and a sensitivity analysis for system uncertainties. It incorporates linear distribution factors and AC load flow sensitivity-based method in order to calculate ATC values efficiently and speedily considering line outages.