Impact analysis of DERs on bulk power system stability through the parameterization of aggregated DER_a model for real feeders

•Discussion of proper parameterization methodology of the DER_A model.•Present importance of proper parameterization of the DER_A voltage trip characteristics for balanced and unbalanced fault studies.•Showcase ability of the DER_A model (a positive sequence model) to provide a representation of tripping of DERs for unbalanced faults in a positive sequence bulk power system study.•Application of DER_A model to represent the behavior of DERs in a real world utility feeder. With an ever increasing percentage of distributed energy resources (DERs) connected behind the meter in the distribution system, it is becoming increasingly important to equip transmission planners with the visibility of DER dynamic performance in distribution system. Not having visibility of the disconnection of DERs with the occurrence of transmission events, could result in an erroneous view of the stability of bulk power system.In this paper, a parameterized aggregated model (DER_a) serves as a representation of the distribution-level dynamics of real residential feeders, which is used for analysis of bulk power system stability. The parameters are obtained by executing dynamic Monte Carlo simulations. Faults are then induced at the substation level causing the DERs to trip which subsequently enables the parameterization of the low and high voltage breakpoints (vl0, vl1, vh0, and vh1) of the DER_a model’s partial voltage trip block. These parameters are then utilized to study the effectiveness of the DER_a model to represent the behavior of the aggregated DERs’ response and their impact on the bulk power system. The case study shows the ability of the positive-sequence DER_a model to provide an accurate estimation of DERs that are susceptible to trip due to 3-ϕ and 1-ϕ faults of transmission.