Canadian Journal of Pure & Applied Sciences

Abstract: A key concept in the restructuring of the electric power industry is the ability to accurately and rapidly quantify the capabilities of the transmission system. Available transfer capability (ATC) calculation is a complicated task, which involves the determination of Total transfer capability (TTC) and its two margins -- Capacity Benefit Margin (CBM) and Transmission Reliability Margin (TRM). Transmission transfer capability is limited by a number of different mechanisms including thermal, voltage and stability constraints. ATC is a limit to the amount of power that can be exchanged between two buses or areas. The calculation of ATC has traditionally been a deterministic calculation. However, loads and line status are stochastic phenomena that possess uncertainties. Load flow is an essential tool in the assessment of ATC. Once the TTC is computed under one set of operating conditions or assumptions, it is useful to determine the effect of the uncertainties in the input parameters, namely load and line parameters. This paper presents the impact of these uncertainties on the transfer capability and its expected price. This would be particularly helpful in determining the appropriate reliability margin and the respective ATC. The proposed method has been tested on IEEE 14 bus test system and the results are presented. Further the results are compared with their respective deterministic values.