Power Flow Analysis on Simplified Feeder Modeling

Three novel models to simplify distribution network analysis are presented including equivalent load model (ELM), equivalent load density model (ELDM), and discrete equivalent load density model (DELDM). The voltages and the power on/through both ends of a feeder are used to describe the load and its distribution pattern within the feeder line. Only real time field data from feeder circuit breakers in substations and sectionalizing switches along the feeder lines are needed to obtain a satisfied analysis result. The loads on the feeder are represented by one load in ELM. Six fundamental load distribution patterns are put forward in ELDM. By solving the voltage drop function and the power loss function of the feeder line, characteristic values together with the corresponding similarity parameters for the six load distribution patterns are obtained, respectively. Weighting values for the six load distribution patterns are calculated, respectively. Consequently, voltage drop and line loss can be acquired without needing the data from each distribution transformer on the feeder line. Based on above method, a discrete equivalent load density model is advanced to improve the property. Examples are also given with comparison with other approaches showing the feasibility of the proposed methods.