NERC Engineering Studies
Auditable compliance engineering assessments for interconnected generator owners and operators across PRC, MOD, and VAR standards
NERC reliability standards impose specific engineering obligations on generator owners and operators. Those obligations must be documented and defensible under audit. TWC prepares compliance assessments that are traceable to the applicable standard, grounded in site-specific data, and organized for audit review. Below are the standards we regularly work with.
Assessments In Demand
These standards are seeing high request volume right now. If you own or operate BES-connected assets, these are worth reviewing first.
Coordination of Protection Systems for Performance During Faults
Requires that protection systems across interconnected facilities are coordinated to operate correctly and selectively during fault conditions, minimizing the extent of any outage.
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Disturbance Monitoring and Reporting Requirements for Inverter-Based Resources
Extends disturbance monitoring obligations to inverter-based resources, requiring IBR owners to install recording equipment capable of capturing the high-speed response characteristics unique to inverter-based generation.
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Frequency and Voltage Ride-Through Requirements for Inverter-Based Resources
Defines the frequency and voltage zones within which IBR protection may not operate during grid disturbances, and specifies performance requirements for how the facility must respond while riding through those disturbances.
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PRC Standards
Protection and Control
Disturbance Monitoring and Reporting Requirements
Requires generator owners to install, maintain, and operate disturbance monitoring equipment capable of recording system events, and to report disturbance data to the applicable reliability coordinator.
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Coordination of Plant Capabilities, Voltage Regulating Controls, and Protection
Requires that equipment capability curves, voltage regulating controls, and protective relay settings are coordinated so that protection does not operate within the generator's normal operating range.
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Frequency and Voltage Protection Settings for Synchronous Generators, Type 1 and Type 2 Wind Resources, and Synchronous Condensers
Defines the frequency and voltage zones within which protection settings on synchronous generators and Type 1/2 wind resources may not operate, ensuring these facilities remain connected during transient grid disturbances.
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Generator Relay Loadability
Requires that generator protection and step-up transformer protection relay settings do not operate on load, distinguishing between fault conditions and heavy load conditions to prevent unnecessary trips.
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Relay Performance During Stable Power Swings
Requires that protection systems can differentiate between a fault and a stable power swing, preventing relay operations that could turn a recoverable swing into a cascading outage.
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Coordination of Protection Systems for Performance During Faults
Requires that protection systems across interconnected facilities are coordinated to operate correctly and selectively during fault conditions, minimizing the extent of any outage.
Learn more →
Disturbance Monitoring and Reporting Requirements for Inverter-Based Resources
Extends disturbance monitoring obligations to inverter-based resources, requiring IBR owners to install recording equipment capable of capturing the high-speed response characteristics unique to inverter-based generation.
Learn more →
Frequency and Voltage Ride-Through Requirements for Inverter-Based Resources
Defines the frequency and voltage zones within which IBR protection may not operate during grid disturbances, and specifies performance requirements for how the facility must respond while riding through those disturbances.
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Unexpected Inverter-Based Resource Event Mitigation
Requires generator owners and operators to investigate and mitigate unexpected IBR tripping or curtailment events, reducing the frequency and magnitude of reliability events caused by unplanned IBR disconnections.
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MOD Standards
Modeling
Verification and Data Reporting of Generator Real and Reactive Power Capability
Requires generator owners to verify and report the actual real and reactive power capability of their generators, so that planning models reflect the true operating range of the facility.
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Verification of Models and Data for Generator Excitation Control System or Plant Volt/Var Control Functions
Requires that dynamic models of generator excitation control systems and plant-level volt/var controllers are verified against field test data, so that system planning studies reflect actual facility behavior.
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Verification and Validation of Dynamic Models and Data
Broadens model verification requirements to all generating facility types, requiring that dynamic models used in planning studies are validated against staged field test results and updated when facility configurations change.
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Verification of Models and Data for Turbine/Governor and Load Control or Active Power/Frequency Control Functions
Requires verification of turbine-governor and active power/frequency control models against field data, so that frequency response modeling used in planning studies accurately reflects how generating units respond to frequency deviations.
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Data for Power System Modeling and Analysis
Establishes data reporting requirements for generator owners and operators to provide steady-state and dynamic model data to planning coordinators and transmission planners for use in bulk power system studies.
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VAR Standards
Voltage and Reactive
Need a NERC Compliance Assessment?
Contact us to discuss your facility's compliance obligations. We work with BES asset owners and operators across North America.
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