Loop-type feeder models for fast distribution system calculations

This paper introduces three novel loop-type feeder models to simplify complicated distribution system calculations. These models are formulated using lumped distribution transformer(s) and lumped load(s) to represent non-uniformly distributed loads along a feeder. These equivalent models are developed to accurately simulate first, the maximum voltage drop from substation to the load points of a given feeder, and then the total copper and core losses. Finally a hybrid model is developed to simulate both maximum voltage drop and losses accurately. The proposed models are applied to an actual 14-bus feeder system. The simulation results show that it is possible to simplify complicated feeders to simple equivalent models in the calculations of feeder voltage profiles and losses with negligible error.