Application of the REI equivalent for operations planning analysis of interchange schedules

A methodology for performing projected interchange studies using an REI equivalent for power systems is presented. Using this REI methodology, based on a general concept previously suggested by T.E. Dy Liacco et al. (1978) but never applied, multiple interchange transactions can be quickly and accurately simulated by the selective, manual adjustment of REI node injections. The REI equivalent was selected since external load and generation are represented on nodes as physically meaningful values. These values can be directly adjusted by the planner to represent potential transactions without intermediate calculations or reequivalencing. It is argued that no other equivalent provides such a straightforward, simple method for transaction simulation given extremely limited information. A description of the method is presented. Basic REI concepts are reviewed and expanded for performing interchange studies. The results of two examples, one using actual real-time values, are provided