Transcript rfirst.org
RFC Webinar
June 17, 2009
Presented By: Mark Kuras
Chair, UFLS SDT
Standards Committee approved SAR on February 24th, 2006
RFC standard was created to meet the requirements of the present NERC
PRC-006 standard
Proposed standard lists requirements for:
▪
UFLS Program implementation (R1)
▪
Creation of a Credible Island determination methodology (R2)
▪
Assessment of credible islands (R3)
▪
Generator under frequency protection (R4)
▪
Creation of UFLS Database (R5)
▪
Population of the UFLS Database (R6)
▪
UFLS Program effectiveness evaluation (R7)
▪
Information exchange (coordination) (R8)
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Posted for 5 comment periods
▪ 5/16/07 thru 6/14/07 – 20 commenters
▪ 10/29/07 thru 11/28/07 – 21 commenters
▪ 5/1/08 thru 5/30/08 – 24 commenters
▪ 9/5/08 thru 10/6/08 – 23 commenters
▪ 1/21/09 thru 2/19/09 – 21 commenters
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During the last rounds of commenting, only
seven general issues came up
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Issue
Applicability goes beyond the NERC Compliance Registry
Criteria
SDT View
Distinguishing between BES and non-BES is not a factor in
the reliability impact of lost generation during an underfrequency condition
The material impact to reliability is solely a function of the
physics of electricity
Loss of generation from a 69 kV station has precisely the same effect
on BES frequency as loss of the same amount of generation from a
BES station
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The NERC Compliance Registry Criteria is subject to
considerations other than reliability and so a conflict has
arisen between reliability and other considerations
The SDT has compromised on the applicability from previous
drafts of the standard, but believes that reliability would be
poorly served if further compromises were made in
deference to these other considerations
Also Note 4 of the Compliance Registry Criteria states
4. If an entity is part of a class of entities excluded based on the criteria above
as individually being unlikely to have a material impact on the reliability of
the bulk power system, but that in aggregate have been demonstrated to
have such an impact it may be registered for applicable standards and
requirements irrespective of other considerations.
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Issue
LSE no longer exists in the Standard, but
Distribution Provider should be removed too
SDT View
Distribution Provider is a valid NERC Functional
Model entity that is presently required to be
registered, even though they are not part of the BES
The NERC Functional Model indicates that
Distribution Providers are responsible for UFLS
implementation, not Transmission Owners
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Issue
Small Distribution Providers
SDT View
Compliance problems lie in the number of
feeders available to balance steps equally
Can group together
Exemption criteria included
Complete exclusion would unfairly burden
other Distribution Providers
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Issue
Generator Protection
SDT View
Establishes minimum clearing times
Having no protection makes you compliant
Very common
Operators must realize that they should not trip
units faster then the standard minimums
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Issue
My generator cannot meet the standard’s
minimum clearing requirements
SDT View
Time periods based on major manufacturer
protection requirements
Also based on legacy Regional requirements
Historically very little exposure to these
frequencies
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Issue
Effective Dates
SDT View
Standard will apply to applicable RFC
Members on RFC Board approval
Standard will apply to applicable RFC
Registered Entities on FERC approval
The same for all regional standards
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Issue
Stop RFC’s UFLS standard development and
wait for NERC
SDT View
This standard is to meet the requirements of
the presently in place NERC standard
This standard will apply in the interim until
NERC approves PRC-006-01
NERC standard is still a ways away
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Our Goal
Questions?
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RELIABILITY
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