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Load Power Factor Audit Results and Updated LPF Standards. Prepared by ISO-New England August 30, 2005. Objective. To describe the changes on the LPF standards for:Connecticut, Southeast NE, Boston and Vermont for the year 2006.

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load power factor audit results and updated lpf standards

Load Power Factor Audit Results and Updated LPF Standards

Prepared by ISO-New England

August 30, 2005

objective
Objective
  • To describe the changes on the LPF standards for:Connecticut, Southeast NE, Boston and Vermont for the year 2006.
  • To report the findings of the LPF audit conducted by the ISO for the year 2004-2005 and;
  • To report Participants’ future reactive targets based on the 2006 LPF standards.
review of load power factor correction program
Review of Load Power Factor Correction Program
  • Ten LPF areas are defined based on
    • Reactive characteristics and performance.
    • Current Interfaces
    • TO boundary
  • Areas review on an annual basis by VTF.
  • Each Area is assessed individually to assess its own reactive needs.
    • Voltage Reactive Performance (OP-17)
    • Net Zero MVAR Interchange (OP-17)
reasons for updating minimum maximum allowable lpf values
Reasons for Updating Minimum / Maximum Allowable LPF Values
  • Changes in area reactive performance due to

transmission changes.

      • Series reactors
      • Transformers
      • Charging
  • Changes in current reactive values (Qmax, Qmin) for key units.
  • Changes in area transfers.
  • Additional static or dynamic reactive compensation.
annual load power factor survey
Annual Load Power Factor Survey
  • ISO-NE is responsible for
    • Conducting the annual LPF survey
    • Evaluating and reporting results
    • Requesting and obtaining any warranted remedial action plans from Participants
  • Specific historical hours are selected and actual LPF operation is surveyed on a Participant basis
  • Evaluation is done by comparing the Participant’s actual LPFs to the corresponding area’s allowable LPFs for the given load levels
  • The degree of noncompliance by each Participant is quantified in terms of surplus or shortfall of reactive capability
annual load power factor survey1
Annual Load Power Factor Survey
  • Note that two sets of area LPF standards (graphs) must be maintained
    • One set that is applicable to past year which is being surveyed and assessed
    • A second set that applies to the next year and is used to determine how much remedial action is needed to meet future LPF standards
    • Next year’s standards automatically become the past year’s standards
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