Electric Grid Modeling for Distribution Generation Applications
2012 M.Eng. thesis, McGill University
Written by Michael Nicholas George
Chapter 4:
Feeder Benchmarking Methodology
Table 2-1: General features of different distribution system types
4.1 Reduction Criteria
The power system components that are retained in the feeder model and the assumptions allowed to be made will be determined by the reduction criteria and the intended applications for the model. For the scope discussed in this thesis, the model shall preserve characteristics of the feeder that will impact switching of protection devices and the DG, as well as the resulting transient phenomena.
4.2 Simplifying Assumptions
In order to simplify the feeder model and treat all of the varieties of feeders in a consistent manner, the following assumptions are made:
Three-phase lines are perfectly symmetrical, so that there is no mutual coupling between sequences.
Loads are constant-power loads that do not fluctuate within the time window of interest. The interconnecting distribution transformers are not included in the model.
Interconnected feeders and distribution spot networks are excluded.
2.2 - Elements of a Distribution Feeder
Most rural feeders can be described by a set of components that is universal to this type of feeder arrangement. Table 2-2 lists these components, as well as the parameters that are essential to describing them for the benchmarking work. This framework derives from that used in describing urban and suburban distribution systems for their respective benchmarks. This set of components will form a template from which parameters and other details can be obtained to complete an appropriately descriptive benchmark for the rural feeder in this paper.
Chapter 5 describes the rural feeder that serves as a case study for this benchmarking work. The feeder is described in terms similar to the template outlined in Table 2-2.
Table 2-2: Elements Common in Rural Feeders
