Estimation of Available Transfer Capability under normal and contingency conditions in deregulated electricity market

In deregulated electricity market, the power marketers share a common transmission network for transferring power from generating station to distribution station. All the market participants, in the open access environment wants to maximize their profit, so they try to obtain the electrical energy from the cheapest source, which may lead to congestion in the transmission network and affect the system security and reliability. Hence, Available Transfer Capability (ATC) of the transmission system needs to be estimated to evaluate the system security while serving a wide range of transactions. In this paper, ATC is estimated for both base case normal operating condition, contingency cases involving single line outage and generator outage with bilateral transactions using Power Transfer Distribution Factor (PTDF), Outage Transfer Distribution Factor (OTDF) and Generator Outage Distribution Factor (GODF) methods respectively. Detailed Simulation study is performed on IEEE 6 bus benchmark test system. From the results, it is observed that the ATC is estimated with very less computation time using distribution factor method and this study will be helpful for the present deregulated electricity market participants.