What is PERC1? A practical guide to the data-center load model
Learn what the PERC1 data-center load model represents, how it differs from ZIP and CMLD, which facility data it needs, and how to validate it.
Field notes for getting large-load models through review.
Practical writing for engineers preparing data-center dynamic models: how PERC1 works, what current interconnection requirements ask for, and how to turn disturbance data into defensible PSS®E evidence.
Articles
Data-center dynamic model requirements: a 2026 submission checklist
A practical checklist for data-center dynamic model requirements, including PERC1, load composition, protection, reconnect behavior, PSS/E files, and evidence.
PSS®E dynamic model validation for data centers: a disturbance-data workflow
A step-by-step workflow for PSS/E dynamic model validation using data-center disturbance records, parameter identifiability, holdouts, and evidence packages.
NERC large-load interconnection: what the 2026 reporting actually found
What NERC’s 2026 large-load reporting found about data-center dynamic models, what it asks planners to do, and how to read it before your next interconnection submission.
Voltage ride-through for data centers: what the facility does versus what the model claims
How data-center voltage ride-through works across the utility service, UPS, and server power supply, why ITIC and SEMI F47 do not answer the planner’s question, and what a model has to show.
How to answer a dynamic model deficiency letter without starting over
A practical method for responding to interconnection model deficiency comments: classify each item, separate evidence gaps from formatting gaps, and close the loop in one cycle.
COMTRADE records for model validation: what makes one usable
What a COMTRADE disturbance record must contain to validate a data-center dynamic model: channels, sample rate, trigger placement, scaling, and the excitation that decides identifiability.
Commissioning tests that make a data-center dynamic model defensible
Which commissioning tests produce evidence a transmission planner can use, how to specify them so the record is usable, and what to do when no test is possible before energization.
Read the authorities, not a summary of a summary.
- Level 3 computational-load alert NERC, May 2026
- Facility interconnection requirements Dominion, April 2026
- What a data-center dynamic model can be identified from Withstand technical note