Transmission Reliability Margin Determination for DC and DCQ Load Flow Method

In a bulk power system network, the transmission reliability margin (TRM) is the extra amount in the available transfer capacity (ATC) that ensures network security under a reasonable range of sensitivity. In ATC estimation, voltage limit, reactive power limit, and system sensitivity should be taken care to avoid inaccuracies that are required for accurate TRM calculation. Determination of accurate TRM is crucial as it should be bigger than any possible sensitivity for reliable operation of the power system network. In this paper, the power system TRM is determined by employing the DC and DCQ load flow methods. Three distinct parameters such as load, line impedance, and voltage are taken into consideration while calculating the system sensitivity that affects the TRM calculation. The sensitivity term is calculated from ATC which is also determined by the DC and DCQ methods. The TRMs are calculated for several power transactions in two IEEE benchmark networks (IEEE 6-bus and IEEE 14-bus systems) in MATLAB/SIMULINK platform. Obtained results demonstrate the efficacy of the employed techniques as they outperform the existing literature results under sensitivity.