SOS: NERC Terms and Definitions (A+ Graded)

Area Control Error (ACE) correct answers The instantaneous difference between a Balancing Authority's net actual and scheduled interchange, taking into account the effects of Frequency Bias, correction for meter error, and Automatic Time Error Correction (ATEC), if operating in the ATEC mode. ATEC is only applicable to Balancing Authorities in the Western Interconnection. Reporting ACE correct answers The scan rate values of a Balancing Authority's ACE measured in MW, which includes the difference between the Balancing Authority's Net Interchange Actual and is Net Interchange Scheduled (NIs), plus its Frequency Bias obligation, plus any known meter error. In the Western Interconnection only, Reporting ACE includes Automatic Time Error Correction (ATEC). Regulation Reserve Sharing Group correct answers A group whose members consist of two or more Balancing Authorities that collectively maintain, allocate, and supply the Regulating Reserve required for all member Balancing Authorities to use in meeting applicable regulating standards. Reserve Sharing Group Reporting ACE correct answers At any given time of measurement for the applicable Regulation Reserve Sharing Group, the algebraic sum of the Reporting ACEs (or equivalent as calculated at such time of measurement) of the Balancing Authorities participating in the Regulation Reserve Sharing Group at the time of measurement. Control Performance Standard (CPS) correct answers The reliability standard that sets the limits of a Balancing Authority's Area Control Error over a specified time period. Dynamic Schedule correct answers A time-varying energy transfer that is updated in Real-time and included in the Net Interchange Scheduled (NIs) term in the same manner as an Interchange Schedule in the affected Balancing Authorities' control ACE equations (or alternate control processes). Inadvertant Interchange correct answers The difference between the Balancing Authority's Net Actual Interchange and the Net Scheduled Interchange (NIa - NIs). Overlap Regulation Service correct answers A method of providing regulation service in which the Balancing Authority providing the regulation service incorporates another Balancing Authority's actual interchange, frequency response, and schedules into providing Balancing Authority's AGC/ACE equation. Pseudo-Tie correct answers A time-varying energy transfer that is updated in Real-time and included in the Actual Net Interchange term (NIA) in the same manner as a Tie Line in the affected Balancing Authorities' control ACE equations (or alternate control processes). Tie-Lines correct answers A circuit connecting two Balancing Authority Areas.