Simplified loop-type fuzzy feeder models for distribution system calculations

摘要

Based on fuzzy set theory, this paper presents loop-type fuzzy feeder models to simplify complicated distribution system analysis. These fuzzy models are formulated using lumped distribution transformer(s) and lumped load(s) to represent non-uniformly distributed loads, which vary by time and type of day and relate to voltage, 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 loop-type feeder, and then the total copper and core losses. Finally a hybrid model is developed to simulate both maximum voltage drop and losses accurately. A physical loop-type feeder is used to demonstrate the correctness of these proposed fuzzy feeder models. The simulation results show that it is possible to reduce many complex loop-type feeders to simple equivalent models in the study of feeder voltage profiles and losses with negligible error.