What are the two types of Inadvertent Interchange?

Inadvertent Interchange is a term used in power system operations to describe the difference between the amount of power scheduled and the actual amount of power delivered or received. The two types of Inadvertent Interchange are Primary and Secondary.

Primary Inadvertent Interchange refers specifically to the immediate, unintended power exchanges that occur as a consequence of system operations. This includes real-time discrepancies caused by generation or load changes that were not reflected in the scheduling process. It typically encompasses the more immediate and short-term variations in power exchange that can occur over a shorter timescale.

Secondary Inadvertent Interchange, on the other hand, relates to long-term accumulations of inadvertent power flows over an extended time period. This type of interchange manifests when there is a persistent difference between scheduled and actual power flows that may not be addressed immediately. It can accumulate over time and may be settled later as operators correct their schedules.

Both types are essential for operators to monitor and resolve to maintain system reliability and ensure that power exchanges between entities reflect actual agreements and operational needs. This systematic categorization helps to identify and mitigate inadvertent adjustments in power interchange effectively.