NERC Final Exam SOS Exam Question With Verified Answers
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NERC
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NERC
NERC Final Exam SOS Exam Question With
Verified Answers
Of the following, which control system would be affected by a difference in Net Actual
Interchange and Net Scheduled Interchange?
a. Automatic Voltage Regulator
b. Reactive Control
c. Automatic Generation Control
d. Turbine Governor Con...
NERC Final Exam SOS Exam Question With
Verified Answers
Of the following, which control system would be affected by a difference in Net Actual
Interchange and Net Scheduled Interchange?
a. Automatic Voltage Regulator
b. Reactive Control
c. Automatic Generation Control
d. Turbine Governor Control - answer✔c. Automatic Generation Control
Feedback: BAL-005, Automatic Generation Control (AGC) Equipment automatically adjusts
generation in a Balancing Authority Area from a central location to maintain the Balancing
Authority's interchange schedule plus Frequency Bias. AGC is a process designed and used to
adjust a Balancing Authority Areas' Demand and resources to help maintain the Reporting ACE
in that of a Balancing Authority Area within the bounds required by applicable NERC Reliability
Standards. Governors arrest frequency deviations, but Automatic Generation Control (AGC)
maintains generation to a schedule. It does this by pulsing the generator governors to either
increase or decrease megawatt as needed.
How is the Frequency Response Obligation (FRO) of a Frequency Response Sharing Group
determined?
a. By averaging the members' FRO's.
b. By adding the individual FRO's of each member.
c. By taking the median Frequency Response Measure of the previous year.
d. By adding the member's Frequency Response Measures of the previous year. - answer✔b. By
adding the individual FRO's of each member.
Feedback:
NERC allows Balancing Authorities to form Frequency Response Sharing Groups (FRSGs) with
other Balancing Authorities to jointly meet their FROs. These FRSGs determine their joint FRO
by adding up the member's individual FROs.
NERC Standard BAL-001 states that a Balancing Authority's clock-minute average of Reporting
ACE reading must not exceed its Balancing Authority ACE Limit (BAAL) for more than
__________.
a. 30 consecutive clock-minutes
b. 30 clock minutes per hour
c. 15 consecutive clock-minutes
d. 90% of 10-minute periods in a month - answer✔a. 30 consecutive clock-minutes
Feedback: BAL-001, Real Power Balancing Control Performance
If a Balancing Authority needs to offset the scheduled frequency by 0.02 Hz, due to an
Interconnection wide time error correction, what adjustment can the Balancing Authority make
to participate Interconnection wide time error correction if unable to change scheduled
frequency?
a. Change the AGC mode
b. Changing the B (frequency bias) setting of the ACE equation
c. Changing the governor speed droop from 5% to 4%
d. Offset its Net Interchange Schedule(MW) by an amount equal to the computed bias
contribution during a 0.02 Hz Frequency Deviation - answer✔d. Offset its Net Interchange
Schedule(MW) by an amount equal to the computed bias contribution during a 0.02 Hz
Frequency Deviation
Feedback: Time Error Correction is when the Interconnection schedules frequency, normally
60.00 Hz to 59.98 Hz or 60.02 Hz in order to adjust clocks that may be either fast or slow due to
the frequency fluctuations of the power system. If the Balancing Authority cannot change
scheduled frequency which would produce -10B (+/-0.02) value, they shall offset its Net
Interchange Schedule by an amount equal to 20% of it Frequency Bias [10B (0.02)]. NERC
Standard BAL-004 and Time Monitoring Reference Document, 2016
A Balancing Authority has a Net Interchange Schedule of -250 MWs from 1200 to 1600 on a
summer day. The Net Interchange Actual for those same hours respectively were -230 MW, -275
MW, -250 MW and -270 MW. What was the Balancing Authority's Inadvertent Interchange for
the 4-hour period?
a. 25 MWs in
b. 25 MWs out
c. 6 MWs out
d. 6 MWs in - answer✔a. 25 MWs in
Feedback: Inadvertent calculation is after the hour and the difference between Net Interchange
Actual and Net Interchange Scheduled.Inadvertent for hour 1: (-230 ) - (-250) = +20Inadvertent
for hour 2: (-275) - (-250) = -25Inadvertent for hour 3: (-250) - (-250) = 0Inadvertent for hour 4:
(-270) - (-250) = -20Net for the period = - 25
Balancing Authority A is currently reading a system frequency of 59.98 Hz. Its Net Actual
Interchange is +100 MW and its Net Scheduled Interchange is +100 MW. If Balancing Authority
A's frequency bias setting is 100 MW/0.1 HZ, what is ACE?
a. -20
b. 0
c. 20
d. 2 - answer✔a. -20
Feedback: ACE = (100 - 100) - [-1000 (59.98 - 60.00)]ACE = 0 - (-1000) (-.02)ACE = 0 -
20ACE = -20
A Balancing Authority has a normal generation capacity of approximately 9400 MW and its
most severe single contingency is an 800 MW coal-fired steam unit. At 1430, with an ACE value
of 20 MW, a 600-MW generator trips off-line as the result of a generator differential. This
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