SOS: NERC Terms and Definitions latest 2023-
2024 /questions with verified answers 100% score!!!
Quiz :Area Control Error (ACE) - Answer :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.
Quiz :Reporting ACE - Answer :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).
Quiz :Regulation Reserve Sharing Group - Answer :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.
Quiz :Reserve Sharing Group Reporting ACE - Answer :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.
Quiz :Control Performance Standard (CPS) - Answer :The reliability standard
that sets the limits of a Balancing Authority's Area Control Error over a
specified time period.
Quiz :Dynamic Schedule - Answer :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).
Quiz :Inadvertant Interchange - Answer :The difference between the
Balancing Authority's Net Actual Interchange and the Net Scheduled
Interchange (NIa - NIs).
, Quiz :Overlap Regulation Service - Answer :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.
Quiz :Pseudo-Tie - Answer :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).
Quiz :Epsilon 1 (E1) - Answer :A constant derived from the targeted frequency
bound. It is the targeted root mean square of one-minute average frequency
error of the Interconnection for one minute. Each Interconnection has a
unique E1. It is the limit for the determining a Balancing Authority's compliance
with CPS1.
Quiz :Balancing Contingency Event - Answer :Any event, or series of events
separated by one minute or less, from a sudden loss of generation, sudden loss
of an import, or sudden restoration of demand that causes an unexpected
change in ACE or imbalance between generation and demand.
Quiz :Contingency Reserves - Answer :Capacity that may be deployed by a
Balancing Authority in response to a Balancing Contingency Event or other
contingency requirement.
Quiz :Contingency Event Recovery Period - Answer :A period beginning when
resource output begins to decline within the first one minute interval of a
Reportable Balancing Contingency Event and extending for 15 minutes.
Quiz :Contingency Reserve Restoration Period - Answer :A period not
exceeding 90 minutes following the end of the Contingency Event Recovery
Period.
Quiz :Disturbance Control Standard - Answer :The reliability standard that
sets the time limit following a Disturbance within which a Balancing Authority
must return its Area Control Error to within a specified range.
, Quiz :Most Severe Single Contingency (MSSC) - Answer :The Balancing
Contingency Event, due to a single contingency identified using system models
maintained within the Reserve Sharing Group (RSG) or a Balancing Authority's
area that is not part of a Reserve Sharing Group, that would result in the
greatest loss (measured in MW) of resource output used by the RSG or a
Balancing Authority that is not participating as a member of a RSG at the time
of the event to meet Firm Demand and export obligation (excluding export
obligation for which Contingency Reserve obligations met by the Sink Balancing
Authority).
Quiz :Operating Reserve - Answer :That capability above firm system demand
required to provide for regulation, load forecasting error, equipment forced
and scheduled outages and local area protection. It consists of spinning and
non-spinning reserve.
Quiz :Reportable Balancing Contingency Event - Answer :Any Balancing
Contingency Event occurring within a one minute interval of a sudden decline
in ACE based on EMS scan data. The event results in a loss of MW output less
than or equal to the MSSC and greater than or equal to the lesser of 80% of the
MSSC or the identified amount for the applicable interconnection. in this
course, we will occasionally refer to a Reportable Balancing Contingency Event
as a reportable event or Reportable Disturbance.
Quiz :Reserve Sharing Group - Answer :A group of two or more Balancing
Authorities that collectively maintain, allocate, and supply operating reserves
required for each Balancing Authority's use in recovering from contingencies
within the group.
Quiz :Frequency Bias Setting - Answer :A number, either fixed or variable,
usually expressed in MW/0.1 Hz, included in a Balancing Authority's Area
Control Error equation to account for the Balancing Authority's inverse
Frequency Response contribution to the Interconnection, and discourage
response withdrawal through secondary control systems.
Quiz :Disturbance - Answer :An unplanned event that produces an abnormal
system condition. Any perturbation to the electric system. The unexpected
change in ACE that is caused by the sudden failure of generation or
interruption of load.
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