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Learn about the Notrees Battery Storage System integration challenges in ERCOT, including technology details, operational areas, registration process, limitations, and identified issues. Explore resource modeling, standardized registration formats, operating procedures alignment, commissioning activities, and co-location complexities.
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Notrees Presentation – ERCOT Integration workshopSlides for Registration/Integration challenges
Notrees Battery Storage System • 36 MW / 24 MWh output • Technology: Advanced lead-acid Dynamic Power Resource • OEM Partner – Xtreme Power (XP) • 24 Dynamic Power Modules with 1.5 MW / 1.0 MWh rating • Modules housed in ~ 6,000 sq. ft. building • Construction began in October 2011; fully operational Q4 2012 • Potential areas of operation: • Frequency Regulation • Energy Arbitrage • Voltage Support • Wind Firming • Curtailment Mitigation • Other Ancillary Services (Non-Spinning Reserve, Black Start)
Registration of new Storage resource • Year-long registration process • Primary source of revisions/discussion on how to ‘fit’ Storage technology into existing framework for ‘conventional’ resources Ongoing ERCOT/Duke/ XP meetings
Limitations of existing Registration/Integration process Issue 1: Resource Modeling Challenge: x1 Physical Asset, but ERCOT systems see x2 Resources - x1 Gen Resource (GR) and - x1 Load Resource (LR) Outcome: Operating duplication & complexity • Separate GR and LR qualifications • Telemetry allocation to identify 'Gen Resource' mode and 'Load Resource' mode • Complex control system functions to ensure RT consistency between modes • Separate GREDP/Performance obligations • How to avoid 'double-counting' in ERCOT market operations processes • Settlement treatment (addressed via PUC rule implementation)
Limitations of existing Registration/Integration process Issue 2: Standardized Registration & Qualification formats Challenge: Standardized RARF information requirements incompatible with operating frameworks for inverter-based Storage technologies, e.g. • Planning Data • Protection Data • Operating Parameters Outcome: Numerous "errors" and "rejections" throughout registration process • Source of automatic registration delays & much discussion • Provision of system-specific technical information to identify performance characteristics
Limitations of existing Registration/Integration process Issue 3: Alignment of existing operating procedures with alternative operating characteristics Challenge: Existing performance requirements designed around installed capabilities Outcome: Potential to limit capabilities of technology, e.g. • Static requirements on Voltage support, Frequency response limit the range of performance available from new types of resources Issue 4: Unfamiliar Commissioning activities Challenge: Project requirements in advance of Operations unfamiliar territory for System Ops e.g. • 'Cycling' of batteries to maintain battery health during construction/commissioning • Inverter testing requirements Outcome: Developer must ensure that Site activity is 'visible' from early stage
Limitations of existing Registration/Integration process Issue 5: Co-location of different asset classes Challenge: Key role for Storage to support other Resource operations and enhance overall grid management – but compounds registration, testing & modeling challenges presented by existing process… Outcome: Additional layer of complexity for both Storage and co-located resource
