Level 3 IBR Alert Engineering and Modeling Support

Per Plant Tasks:

Task 1: Validate Electromagnetic Transient (EMT) and Root-Mean-Square (RMS) Models

• Develop a Request for Information (RFI) to send to applicable inverter and power plant controller (PPC) original equipment manufacturers (OEMs) requesting unit/PPC model validation reports and/or model benchmark reports that demonstrate that the models match actual equipment controls.
• Request information pertaining to EMT model performance during type testing and performance against positive sequence models.
• Request information describing any technical limitations in models.
• If data is not available from OEM, support compiling best and most accurate OEM-specified model information for the specific plant models in a central repository.
• Review the information supplied by OEMs to identify any potential discrepancies with the models you currently use or hold; document and resolve discrepancies, to the extent possible.
• Review the overall model topology (e.g., number of inverters, capacity sizes, impedances, PPC and inverter control structure, etc.) to ensure it matches the site.

Task 2: Perform Commissioning Conformance Assessment

• Conduct a model verification assessment (conformance assessment) to compare the installed inverter/PPC configuration (hardware, firmware) and settings against your models (i.e., the interconnection study model).
• Review those models to ensure they comply with any established interconnection requirements as you provide them for the specific Transmission Planner and Planning Coordinator (TP/PC) area (e.g., ERCOT NOGRR 245, etc.).
• Develop and deliver a conformity assessment report detailing any mismatches between the model and the as-left settings at the site, and document any required updates.

Task 3: Verify PFR Testing and Staged Event Performance

• Ensure primary frequency response (PFR) is appropriately enabled and configured at the site and that the latest dynamic models accurately reflect this configuration. Review earlier NERC MOD-027-1 reports, where available, to ensure they also align with the as-left settings and the latest dynamic models (MOD-026-2 took effect April 1, 2026 and replaced MOD-026-1 and MOD-027-1).
• Review practices pertaining to dynamic model development, testing, and model validation and how they align with Transmission Owner and TP expectations and commissioning procedures; provide recommendations where applicable.
• This verification does not involve MOD-026-2 testing; however, we can support these efforts with an additional module.

Task 4: Model Traceability and Parameter Transparency

• Gather applicable modeling documentation from you and the OEMs to ensure all latest and accurate modeling information and documentation is defined for each site.
• Consolidate any remaining discrepancies with the models you currently use or hold; resolve discrepancies, to the extent possible, and document findings.
• Ensure the positive sequence model(s) align with the NERC uniform modeling framework efforts underway with Order 901 Milestone 3 efforts -- specifically the standard library models.
• If a standard library model is not available for a specific site, support gathering these models from applicable OEMs and then build the overall IBR plant model for the site. Tune the standard library model to ensure it is benchmarked against the user-defined model or PSCAD model.

Standalone Tasks:

Task 5: Support OEM Contract Language

• Develop and provide technical contract clauses to require lifecycle model support, version tracking, re-validation services, and other model-related specifications for inclusion in procurement contracts with inverter/PPC OEMs.
• Provide recommended practices and guidance regarding the delivery of steady-state and dynamic models in PSCAD, PSS/E/PSLF, TSAT, etc. This may include model formats, user documentation, model test reports, model attestations from OEMs, parameterization, site-specific data collection, etc.

Task 6: Assist in Model Library Development (included with the platform)

• Support the creation of a site-specific IBR model library that includes the validated models and all supporting documentation, evidence, and reports.
• If desired, support ongoing maintenance of the IBR model library across sites.