Correlation between Transmission Reliability Margin and Standard Deviation of Uncertainty

In any power system the major responsibility of a designer is to make the best possible balance between economical and reliable electrical power supply according to the customers' demand as well as acknowledge the uncertainties which will occur in the system. There is a capability of transferring power between two nodes and power transfer between those two nodes must not exceed that transfer capability. To fulfil demand, more power need to be transferred over the existing amount; that's why the estimation of Available Transfer Capability (ATC) is needed which give us the information of further transactions after the base transactions. That additional flow of power in the system network must be done without jeopardizing the system adequacy and security; for that the computation of Transmission Reliability Margin (TRM) is needed. Besides, any uncertainty in a system affects the TRM. In this paper, the relation between the S.D of uncertainty and TRM explains briefly as well as presents it in graphs.