MISO BPM-015 Appendix I

I-1 and I-2 · Model package by milestone

What it means. At the interconnection request, the customer submits the standard library, TSAT UDM and PSCAD models with a model quality and performance test report. At Decision Points 1 and 2 it submits updated models and a new report for any change to the plant that affects its electrical output; in general, any change that results in a Material Modification request or Qualified Change review triggers a new submission, and changes must not degrade performance in any of the Section 5 tests. Before GIA execution it submits all final models, including the PSS/E UDM, with a test report using updated site short circuit ratio (SCR) and X/R ratio when known; these final models set the baseline performance expectation. Within 60 days before COD it shows that as-built equipment and parameterization match the study models, with evidence such as screenshots, photos, inverter or power plant controller control mode and protection settings, and nameplate data, and resubmits models and a report if anything differs from the GIA models. Within 30 days of later changes, the Generator Owner submits an as-left verification report.

Evidence MISO expects. Dated model packages and test reports for each milestone, redlined documentation of changes, the pre-COD verification package, and as-left verification reports.

I-4.1 · General model requirements

What it means. Models match the installed (or planned) equipment and include all controls and protections that could affect electrical output, to the extent possible. Each model type is a standalone, simulation-ready package at the requested service level, with switchable control modes and modifiable setpoints. Identical IBR units and unit transformers are aggregated, with one equivalent per type; the collector system is represented by an equivalent; main power transformers and shunt devices on the collector bus are explicit. Controls of mechanically switched reactive devices and main transformer tap changers are modeled if they respond within 10 seconds. OEM attestations are required that the IBR unit and power plant controller models represent the planned or installed equipment, and IBR unit models are validated with type test, factory acceptance test or hardware-in-the-loop comparisons for large-signal disturbances. Documentation covers known limitations, supported software versions and time steps, control strategy and block diagrams, and the parameters for frequency droop, frequency deadband, voltage-reactive power droop, and ride-through and protection settings.

Evidence MISO expects. Model documentation for each model type, OEM attestations, and unit-level validation results.

I-4.2 to I-4.5 · Platform-specific requirements

What it means. Standard library models are compatible with the PSS/E and TSAT versions MISO specifies and are not on the NERC, MISO or ERAG AMWG unacceptable lists. PSS/E and TSAT UDMs allow a quarter-cycle time step, initialize at any feasible operating point without suspect initial conditions, are dispatchable within equipment capability, and allow headroom to be enabled for low-frequency events; PSS/E UDMs are table-driven only. PSCAD models use actual hardware control code if possible, represent full inner control loops, the primary energy source and DC-side dynamics, include transformer saturation, are compatible with PSCAD 5.0.0 and higher, do not require a time step below 10 microseconds, reach their initial condition within 5 seconds, support snapshot and multiple-run, avoid global variables and multiple layers, and are delivered in an example case that initializes properly.

Evidence MISO expects. Model files for each platform, the stated software and compiler compatibility, and the example test case.

I-4.6 · Parameter verification

What it means. An OEM-prepared Parameter Verification Report is submitted with the signed-GIA model submission, within 60 days before COD as final verification of as-built settings, and within 30 days of any post-COD parameter change that affects electrical output. It includes equipment make, model and firmware matching the study models; a mapping table from PSS/E, TSAT and PSCAD parameters to field parameters, with scaling factors, naming correlations and relationships where there is no 1:1 match; as-built settings exported from the IBR units, power plant controller and other controlled devices, with timestamps; protection settings as implemented; and justification of any differences. The interconnection customer or its engineering, procurement and construction (EPC) contractor verifies and approves it before commissioning. Discrepancies are resolved by updating the models or the field settings, or by a technical justification subject to MISO approval. The interconnection customer also writes these requirements into its OEM supply agreements.

Evidence MISO expects. The report with timestamped parameter exports, the approval record, the resolution of each discrepancy, and the supply agreement provisions.

I-5 · Model quality and performance tests

What it means. Tests use a single-machine infinite bus with an SCR of 3 and X/R of 5 for the interconnection request, where applicable, and site-specific values at GIA and COD as available. Each runs at least 30 seconds, plots frequency, voltage, active and reactive power at the point of measurement, and overlays all four models; major discrepancies between models must be explained or MISO rejects them. All models run initialization, a bolted three-phase fault cleared in 10 cycles, small voltage and small frequency disturbances (with and without headroom), high voltage ride-through (1.19 per unit for 1 second), low voltage ride-through, high and low frequency ride-through, protection verification (steps to 1.5 and 0 per unit and to 70 and 50 Hz, where the plant is generally expected to trip unless its relays are proven set outside these conditions), and SCR step changes with repeated faults. PSCAD models also run a plus or minus 25 degree phase angle change. Pass criteria for most tests are no trip, a stable response with a damping ratio of 0.3 or greater, no momentary cessation in the small voltage, high and low voltage ride-through and phase angle tests, and, where active power is reduced, recovery to the pre-disturbance value within 1.0 second.

Evidence MISO expects. The model quality and performance test report with overlaid plots for every test and model, in the layout of the Appendix I example report, and written explanations of any differences between models.