NERC MOD-027 Compliance
Turbine & Governor Model Verification
eGridSync verifies turbine and governor dynamic models through field testing and frequency response analysis ensuring accurate frequency stability studies.
What is MOD-027?
MOD-027 ensures turbine/governor models accurately represent frequency response behavior critical for system stability.
Governor Response Models
Verifies turbine/governor models match actual frequency response during disturbances
Frequency Stability
Accurate models critical for frequency response studies and reliability assessments
Frequently Asked Questions
What is MOD-027?
MOD-027 requires Generator Owners to verify turbine and governor dynamic models against actual field performance through frequency response testing or disturbance analysis. Critical for system frequency stability studies.
Who must comply?
Generator Owners of BES generators with governors requiring dynamic model verification. Applies when units placed in service or governor modifications occur.
What models are verified?
Governor models (droop, deadband, speed control), turbine models (steam, hydro, combustion), load reference control, and frequency response characteristics.
Is testing required?
Yes. Field testing or frequency disturbance data analysis required to validate governor response matches model predictions.
How often?
When units placed in service, governor modified, or periodically per entity procedures. Typical 5-10 year cycles.
What test methods?
Frequency response tests, governor droop tests, step load changes, or analysis of actual system frequency events.
How long?
2-4 months including test planning, execution, analysis, model tuning, documentation.
What evidence?
Test data, model-vs-measured comparisons, parameter justifications, verification reports, planning model updates.
Can manufacturer models be used?
Manufacturer models provide baseline but require field validation against actual site-specific governor tuning and response.
Relation to MOD-026?
MOD-026 verifies excitation (voltage control). MOD-027 verifies governor (frequency control). Both ensure complete generator model accuracy.
Common findings?
Default parameters not validated, missing test data, models not updated after governor changes, incorrect deadband settings, disabled governor controls.
Accuracy requirements?
Industry targets 5-10% error in MW response to frequency changes. Critical for frequency response adequacy studies.
What if mismatch?
Requires parameter tuning or identifying equipment issues (governor degradation, incorrect settings). May need additional testing.
Tools used?
PSS®E, PSCAD for simulation. PMUs, SCADA for measurements. Frequency response analysis tools.
eGridSync support?
Verification reports, test data analysis, model tuning, technical documentation, audit support during NERC reviews.
Official References
Important: This summarizes MOD-027 in original language. Refer to official NERC standard for authoritative requirements.
Ready for MOD-027 Compliance?
For turbine/governor model verification and testing, contact eGridSync.