NERC BAL-005, BAL-006,FAC-001
Gary Nolan
WECC ISAS
April 20, 2016
What is Changing and Why
•June 2013 – NERC Independent ExpertReview Report
•Fall 2013 – NERC Appointed BAL PeriodicReview Team (PRT)
•Fall 2014 – NERC Appointed BARC 2Standard Drafting Team
•February 2016 – Final Draft BAL-005-1,FAC-001-3, Retirement BAL-006-2approved by NERC Ballot Body
2
BAL-005 Changes
BAL-005 Changes
•R1. All generation, transmission, and load operating within anInterconnection must be included within the metered boundariesof a Balancing Authority Area.
4
R3. Each Transmission Owner shall address the following items in its Facilityinterconnection requirements:
3.3. Procedures for confirming with those responsible for the reliability ofaffected systems that new or materially modified Facilities are within aBalancing Authority Area’s metered boundaries.
R4. Each applicable Generator Owner shall address the following items in itsFacility interconnection requirements:
4.3. Procedures for confirming with those responsible for the reliability ofaffected systems that new or materially modified Facilities are within aBalancing Authority Area’s metered boundaries.
BAL-005 Changes
•R2. Each Balancing Authority shallmaintain Regulating Reserve that can becontrolled by AGC to meet the ControlPerformance Standard. (Retirementapproved by FERC effective January 21,2014.)
5
BAL-005 Changes
•R3. A Balancing Authority providing Regulation Service shallensure that adequate metering, communications, and controlequipment are employed to prevent such service from becoming aBurden on the Interconnection or other Balancing Authority Areas.
•R4. A Balancing Authority providing Regulation Service shall notifythe Host Balancing Authority for whom it is controlling if it isunable to provide the service, as well as any IntermediateBalancing Authorities.
•R5. A Balancing Authority receiving Regulation Service shallensure that backup plans are in place to provide replacementRegulation Service should the supplying Balancing Authority nolonger be able to provide this service.
6
New R7. Coordination of Common Values.
BAL-005 Changes
•R6. The Balancing Authority’s AGC shall compare total NetActual Interchange to total Net Scheduled Interchange plusFrequency Bias obligation to determine the BalancingAuthority’s ACE. Single Balancing Authorities operatingasynchronously may employ alternative ACE calculationssuch as (but not limited to) flat frequency control. If aBalancing Authority is unable to calculate ACE for morethan 30 minutes it shall notify its Reliability Coordinator.
7
R2. A Balancing Authority that is unable to calculate Reporting ACE for morethan 30- consecutive minutes shall notify its Reliability Coordinator within 45minutes of the beginning of the inability to calculate Reporting ACE.
BAL-005 Changes
•R7. The Balancing Authority shall operate AGC continuouslyunless such operation adversely impacts the reliability ofthe Interconnection. If AGC has become inoperative, theBalancing Authority shall use manual control to adjustgeneration to maintain the Net Scheduled Interchange.
8
Retired under P81. Since manual operation is acceptable, continuallyoperation of AGC is not reliability based requirement.
BAL-005 Changes
•R8. The Balancing Authority shall ensure that data acquisition forand calculation of ACE occur at least every six seconds.
•R8.1. Each Balancing Authority shall provide redundant andindependent frequency metering equipment that shallautomatically activate upon detection of failure of the primarysource. This overall installation shall provide a minimumavailability of 99.95%.
9
R3. Each Balancing Authority shall use frequency metering equipment for thecalculation of Reporting ACE:
3.1. that is available a minimum of 99.95% for each calendar year; and,
3.2. with a minimum accuracy of 0.001 Hz.
R1. The Balancing Authority shall use a design scan rate of no more than sixseconds in acquiring data necessary to calculate Reporting ACE.
BAL-005 Changes
•R9. The Balancing Authority shall include all InterchangeSchedules with Adjacent Balancing Authorities in the calculation ofNet Scheduled Interchange for the ACE equation.
•R9.1. Balancing Authorities with a high voltage direct current(HVDC) link to another Balancing Authority connectedasynchronously to their Interconnection may choose to omit theInterchange Schedule related to the HVDC link from the ACEequation if it is modeled as internal generation or load.
10
Included as part of the Reporting ACE definition in NERC Glossary of Terms.
This “may” requirement is now also replaced with similar guidance in theActual Net Interchange and Scheduled Net Interchange values of the ReportingACE.
BAL-005 Changes
•R10. The Balancing Authority shall include all Dynamic Schedulesin the calculation of Net Scheduled Interchange for the ACEequation.
•R11. Balancing Authorities shall include the effect of ramp rates,which shall be identical and agreed to between affected BalancingAuthorities, in the Scheduled Interchange values to calculate ACE.
11
Both are now included in the Scheduled Net Interchange definition portion ofReporting ACE in the NERC Glossary.
BAL-005 Changes
•R12. Each Balancing Authority shall include all Tie Line flows withAdjacent Balancing Authority Areas in the ACE calculation.
12
R7. Each Balancing Authority shall ensure that each Tie Line, Pseudo-Tie, andDynamic Schedule with an Adjacent Balancing Authority is equipped with:
7.1. a common source to provide information to both BalancingAuthorities for the scan rate values used in the calculation of ReportingACE; and,
7.2. a time synchronized common source to determine hourly megawatt-hour values agreed-upon to aid in the identification and mitigation oferrors under the Operating Process as developed in Requirement R6.
BAL-005 Changes
•R13. Each Balancing Authority shall perform hourly error checksusing Tie Line megawatt-hour meters with common timesynchronization to determine the accuracy of its controlequipment. The Balancing Authority shall adjust the component(e.g., Tie Line meter) of ACE that is in error (if known) or use theinterchange meter error (IME) term of the ACE equation tocompensate for any equipment error until repairs can be made.
13
Portion concerning synchronization and equipment error was moved to R7.Hourly checks are part of Operating Process in R6.
7.2. a time synchronized common source to determine hourly megawatt-hour values agreed-upon to aid in the identification and mitigation oferrors under the Operating Process as developed in Requirement R6.
BAL-005 Changes
•R14. The Balancing Authority shall provide its operating personnelwith sufficient instrumentation and data recording equipment tofacilitate monitoring of control performance, generation response,and after-the-fact analysis of area performance. As a minimum,the Balancing Authority shall provide its operating personnel withreal-time values for ACE, Interconnection frequency and NetActual Interchange with each Adjacent Balancing Authority Area.
14
R7. Each Balancing Authority shall ensure that each Tie Line, Pseudo-Tie, andDynamic Schedule with an Adjacent Balancing Authority is equipped with:
7.1. a common source to provide information to both BalancingAuthorities for the scan rate values used in the calculation of ReportingACE;
7.2. a time synchronized common source to determine hourly megawatt-hour values agreed-upon to aid in the identification and mitigation oferrors under the Operating Process as developed in Requirement R6.
BAL-005 Changes
•R15. The Balancing Authority shall provide adequate and reliablebackup power supplies and shall periodically test these supplies atthe Balancing Authority’s control center and other critical locationsto ensure continuous operation of AGC and vital data recordingequipment during loss of the normal power supply.
15
Retired. Duplicative of EOP-008 Loss of Control Room Functionality.
BAL-005 Changes
•R16. The Balancing Authority shall sample data at least at thesame periodicity with which ACE is calculated. The BalancingAuthority shall flag missing or bad data for operator display andarchival purposes. The Balancing Authority shall collect coincidentdata to the greatest practical extent, i.e., ACE, Interconnectionfrequency, Net Actual Interchange, and other data shall all besampled at the same time.
16
Same periodicity is in R7:
7.1. a common source to provide information to both Balancing Authorities forthe scan rate values used in the calculation of Reporting ACE;
Missing or bad data, R4:
R4. The Balancing Authority shall make available to the operator informationassociated with Reporting ACE including, but not limited to, quality flagsindicating missing or invalid data.
BAL-005 Changes
•R17. Each Balancing Authority shall at least annually check andcalibrate its time error and frequency devices against a commonreference. The Balancing Authority shall adhere to the minimumvalues for measuring devices as listed below:
DeviceAccuracy
Digital frequency transducer≤0.001 Hz
17
R3. Each Balancing Authority shall use frequency metering equipment for thecalculation of Reporting ACE:
3.1. that is available a minimum of 99.95% for each calendar year; and,
3.2. with a minimum accuracy of 0.001 Hz.
BAL-006 Changes
18
BAL-006 Changes
•R1. Each Balancing Authority shall calculate and recordhourly Inadvertent Interchange.
•R2. Each Balancing Authority shall include all AC tie linesthat connect to its Adjacent Balancing Authority Areas in itsInadvertent Interchange account. The Balancing Authorityshall take into account interchange served by jointly ownedgenerators.
19
Both the Independent Expert Review and PRT agreed these should be retiredunder P81, administrative in nature.
BAL-006 Changes
•R3. Each Balancing Authority shall ensure all of itsBalancing Authority Area interconnection points areequipped with common megawatt-hour meters, withreadings provided hourly to the control centers of AdjacentBalancing Authorities.
20
Moved into BAL-005 R7:
R7. Each Balancing Authority shall ensure that each Tie Line, Pseudo-Tie, andDynamic Schedule with an Adjacent Balancing Authority is equipped with:
7.1. a common source to provide information to both BalancingAuthorities for the scan rate values used in the calculation of ReportingACE;
BAL-006 Changes
•R4. Adjacent Balancing Authority Areas shall operate to a common NetInterchange Schedule and Actual Net Interchange value and shall recordthese hourly quantities, with like values but opposite sign. Each BalancingAuthority shall compute its Inadvertent Interchange based on thefollowing:
•R5. Adjacent Balancing Authorities that cannot mutually agree upon theirrespective Net Actual Interchange or Net Scheduled Interchange quantitiesby the 15th calendar day of the following month shall, for the purposes ofdispute resolution, submit a report to their respective Regional ReliabilityOrganization Survey Contact. The report shall describe the nature and thecause of the dispute as well as a process for correcting the discrepancy.
21
Both the Independent Expert Review and PRT agreed these should be retiredunder P81, administrative in nature.
Next Steps
•NERC Board of Trustees adopted February11, 2016
•Pending FERC Filing
•BAL-005-1 Effective: First day of firstcalendar quarter that is 12 months afterthe effective date of the applicablegovernmental authorities order approvingthe standard.
•BAL-006-2 Retired concurrently.
22
Questions?
Gary Nolan
gary.nolan@aps.com