Modules · Modeling studies · Module 067
ISO-NE Model Quality Tests
The ISO-NE Planning Procedure 5-6 Appendix C-2 test battery at short circuit ratios 3 and 10, run on your PSCAD and PSS/E models.
About this module
What this module covers.
ISO-NE requires model quality tests (MQT) for inverter-based resources (IBRs), per Planning Procedure 5-6 (PP5-6) Appendix C-2. This module conducts the required ISO-NE MQT studies to validate your dynamic models against ISO-NE performance criteria. Appendix C-2 requires most tests to run at both short circuit ratio (SCR) 3 and SCR 10, so this is a larger battery than a single-strength suite; energy storage plants repeat each case in charging mode at submission time.
Module: 067
Kind: Modeling studies
Governing body: ISO-NE
Applies to: Before and after commercial operation
Typical time: Two to three weeks, all in, including your review
Dashboard capabilities
- Model Workspace Management: your plant's simulation model files kept in one dashboard workspace, with version tracking
- PSCAD Simulations
- PSS/E Simulations
Support services
What GridStrong does inside this module.
- Perform all required ISO-NE Model Quality Tests (44 tests across SCR 3 and SCR 10; full list below).
- Benchmark results across PSCAD and PSS/E models.
- Coordinate with original equipment manufacturers (OEMs) on modeling deficiencies identified during testing.
- Prepare the MQT report for your submission to ISO-NE.
Tests: Steady state / capability
- Flat Run (Pnet, Q0) and (0.5 Pnet, Q0)
- PSS/E flat start (20 s) and ring-down (60 s)
- Steady-state Q limit (Pnet/P0 x Qmax/Qmin) - 4 cases
- Dynamic Q limit (V step up / down)
Tests: Reference steps (at SCR 3 and SCR 10)
- Vref step +/-2%
- Pref step +/-10%
- Frequency step +/-0.3 Hz
Tests: Fault ride-through (FRT) (at SCR 3 and SCR 10)
- Balanced FRT 2x3-phase bolted (Pnet and 0.5 Pnet)
- Balanced FRT at IBR collector bus (HVDC-connected)
- Balanced remote FRT (66% V)
- Unbalanced FRT single-line-to-ground, 15 cycles
Tests: Protection & ride-through curves
- Voltage protection verification (over / under voltage)
- PRC-024 low- and high-voltage ride-through (LVRT and HVRT) curves at the point of interconnection (POI)
- Low / High frequency ride-through composite
Tests: Grid disturbance (at SCR 3 and SCR 10)
- Rate of change of frequency (ROCOF) 5 Hz/s, 60 to 59 Hz
- Phase angle jump +/-25 deg
- POI SCR transition + 3-phase fault at each transition
Final deliverables
- ISO-NE MQT report including results from all required tests at both system strengths.
- Updated PSCAD and PSS/E simulation models where applicable (charged under the related modules).
What we need from you
- Latest PSCAD and PSS/E simulation models including collector system, main power transformer, power plant controller, and all necessary control and protection.
- Single-line diagram of the plant.
- PRC-024 voltage and frequency ride-through settings.
- User manuals and OEM documentation.
Assumptions and considerations
How the scope is bounded.
- Most tests run at both SCR 3 and SCR 10 per C-2 Section 1.1.3.
- Energy storage plants repeat each case in charging mode (negative POI real power) at submission.
- You supply all required models and site documentation.
Other modules
Every module runs on the same record.
Run this module on one site.
Tell us the plant and the deadline. An engineer confirms the inputs, the schedule and what the Dashboard needs from you.