The effect of load model composition on N-1 contingency ranking

In order to have a reliable N-1 contingency ranking, the analysis must be based on the current power system topology. Load model composition plays a crucial role in the effects of particular contingencies; and this can change the ranked lists used by the Energy Management System. Modern devices such as Phasor Measurement Units (PMUs) allow us to better predict the critical sensitivities in the system using distribution factors to measure the line flows. PMUs and other voltage measurement devices can also be used to estimate accurate load model parameters. Both strategies using online system measurements are investigated in this study to compute contingency rankings. The benefits and limitations of each method are discussed and compared to procedures used today.