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ROS Meeting

ROS Meeting. April 9, 2003 Lee Westbrook. Need for Standard. Reactive compensation essential to voltage support Compensation supplied at one level (generation, transmission, or distribution) affects that needed at other levels Responsibilities must be clearly defined and assigned

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ROS Meeting

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  1. ROS Meeting April 9, 2003 Lee Westbrook

  2. Need for Standard • Reactive compensation essential to voltage support • Compensation supplied at one level (generation, transmission, or distribution) affects that needed at other levels • Responsibilities must be clearly defined and assigned • Compliance must be monitorable

  3. Past Standard Development Difficulties • Agreement difficult • Resulted in vague, unmeasurable responsibilities • Any specific responsibilities were “lowest common denominator” • Studies not definitive • Model and Data uncertainty • Few clear result “breakpoints” • No technical study can allocate reactive responsibility among generation, transmission, and distribution

  4. Past Standard Development Difficulties (cont’d) • Cost recovery uncertainty and diversity • Diverse voltage control philosophies • Monitoring difficult (metering deficiencies)

  5. Past Advantages • Integrated utilities could control voltage in an integrated fashion (i.e., operating and planning decisions could be made centrally for generation, transmission, and distribution) • Fewer remote generators, power transfers • Less dispatch variability • All generators had AVRs

  6. Interim StandardNegative Perceptions • Need more information from a voltage study in progress • Need more definition of monitoring, compliance, and enforcement mechanisms • Cost allocation may not be equitable • Differing locational and functional requirements are discriminatory • ERCOT discretion deemed excessive

  7. Interim StandardNegative Perceptions (cont’d) • Cost of monitoring/compliance too high • Inadequate justification of requirements • Exclusions (e.g., wind generators, generator grandfathering) deemed unjustified or inadequate • No specific DSP requirements, only TDSP • Inadequate generator testing requirements • Organization of standard confusing

  8. Objectives • Ensure that reactive power capability is installed and deployed adequate to prevent unacceptable voltage or voltage instability in ERCOT under credible operating conditions • Ensure that the standard requires neither the installation of unneeded reactive power capability, nor the expenditure of compliance monitoring costs that are unnecessary • Provide ERCOT with a mechanism to address situations when the standard does not define market participant compliance responsibilities with sufficient clarity to provide what is needed for acceptable reliability • Ensure that different requirements on market participants who are similar except for geographic location are justified and documented

  9. Objectives (cont’d) • Provide for application of the standard on an aggregated facility basis where reasonable • Provide for reduced requirements on existing facilities (e.g., grandfathering) only when justifiable considering cost and reliability • Provide an opportunity for market participants to refute an ERCOT finding of noncompliance • Create a standard that clearly states the obligations of market participants and is organized to allow them to locate all obligations easily • Distinguish between DSP and TSP requirements, since the organizations may not be integrated and the cost recovery mechanisms differ • Avoid staging and sunsetting of requirements if possible

  10. Approach - RCVC TF • Segregate drafting into requirements, monitoring and compliance, and education • Create a document in parts to facilitate discussion, voting • Present to ROS with any non-consensus issues clearly delineated • Present to WMS, TAC, etc. • If approved, incorporate into OGRRs, PRRs, and ERCOT Procedures for normal processing

  11. Technical Facts • Static reactive is needed to preserve dynamic reactive • Dynamic reactive is needed to survive disturbances • Static reactive is lower $/MVAR than dynamic reactive • The lower the voltage level, the lower the static reactive $/MVAR • Reactive power transport is ineffective over significant distance

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