Participation Points Overview

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A participation point is a member of an injection group. It is a generator, load, switched shunt, bus, or another injection group that participates in, or contributes to, the output of an injection group. Each participation point record identifies the generator, load, switched shunt, bus, or injection group that fills this role, its participation factor, and how that participation factor is calculated. A participation point’s participation factor identifies the degree to which the point will contribute to its injection group’s output relative to the other points making up the group. Participation factors may be defined as having a fixed value, or they may be re-calculated with every use to stay true to how they were originally defined.

Each time that an injection group is used, the participation factors for all participation points in the group are normalized so that the factors of all participating participation points sum to 100%. The normalized factors dictate how much a generator, load, bus, or switched shunt contributes to the output of an injection group. The normalization accounts for the re-calculation of the participation factors with each use of the injection groups and the exclusion of participation points because of options set with the various tools that use injection groups. Participation points can be excluded for various reasons including, but not limited to, the exclusion of generator participation points because the generator is not on AGC control or because the generator is at a minimum or maximum limit. Bus participation points will not be used in tools that actually change the injection of the group, but they may be included in some linear sensitivity calculations.

Participation points are added to or deleted from an injection group using the Injection Group Dialog. The Injection Group Dialog houses the Participation Point Records Display, which allows the addition or deletion of points and opening the Participation Points Dialog to obtain more information about the points.