Aggregation of component-based grid-feeding DER and load models for simulation of microgrid islanding transients
M.H. Roos, P.H. Nguyen, J. Morren, and J.G. Slootweg
Electric Power Systems Research, vol. 189, art. no. 106759, 2020
The reliability of distribution networks can be improved by islanding of part of the network when a short-circuit fault occurs. The voltage and frequency stability during transient can be evaluated with time-domain simulations using component-based DER and load models. However, simulations with this type of models have a relatively high computational burden which constrains periodical stability analysis of microgrids. This paper proposes an aggregation methodology which significantly decreases the computation time of fault-initiated islanding simulations with component-based models, while maintaining the nonlinear dynamics. The methodology is first validated by directly comparing the original and equivalent models during large voltage and frequency transients. Secondly, a fault-initiated islanding case study of a residential distribution network is performed. For both validations, a sensitivity analysis of model parameters and voltage variations is performed. The results indicate the methodology preserves the dynamics of DERs and loads, while significantly reducing the computational time.