Distribution load flow calculations using time driven and probabilistic approaches

Distributed resources (i.e., distributed generation and energy storage) and some special loads (e.g., electrical vehicle) raise new challenges for load flow calculations in distribution systems. Intermittent and non-dispatchable generation units, complex time-dependent or asymmetrical loads require capabilities that until very recently were not available in many distribution software packages; for instance, capabilities for probabilistic and time driven simulations. This paper presents the work made by the authors to adapt OpenDSS, a free available distribution simulator, to perform these types of studies. The paper includes several examples based on a modified IEEE test feeder and a discussion about the potentialities offered by other tools for preparing input data.