Comparison and Category 2 Registration Practice Guide

Category 2 Generator Owner and Generator Operator Inverter-Based Resources This informational webinar will review the Practice Guide and address the application of the Category 2

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2025 Inverter-Based Resource Registration Initative

The most common types of inverter-based generating resources in the WECC footprint are solar, Type 3 and Type 4 wind power plants, and battery energy storage systems.

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Document Portrait (Two Pages)

For consistent application of registering Category 2 GOs and GOPs, it is important to review the criteria for registering Category 1 (i.e., BES resources) owners and operators.

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NERC Category 2 Compliance: New Registration Requirements

NERC has lowered the registration threshold to include assets connected at 60 kV+ and 20 MVA+. This means many inverter-based resources that were previously exempt now need to register with NERC.

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Wind Fields in Category 1–3 Tropical Cyclones Are Not Fully

We perform high-fidelity numerical simulations of Category 1, Category 2, and Category 3 storms to compare wind conditions in tropical cyclones with wind turbine design criteria.

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RP-2024-19

For the purposes of Category 4, a qualified solar or wind facility is also FTM if 50 percent or more of its electricity generation on an annual basis is physically exported to the broader electricity grid.

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ECE/ENERGY/GE.3/2025/7

A table summarising the definition of categories and sub-categories and supporting explanations with additional wind energy context is included in Annex II, with an abbreviated categorisation table

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NERC registration and Category 2 Registration

The North American Reliability Corporation (NERC) has introduced new terminology – Category 1 and Category 2 – to distinguish between different groups of inverter-based resources (IBRs) in its

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Most wind capacity in the United States is designed for a medium wind

Wind design classes, as defined by the International Electrotechnical Commission (IEC), range from Class 1 (high wind) to Class 4 (very low wind). Many of the earliest wind projects in the United States

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Power System Studies

The type-1 and type-2 wind turbines use induction generators (IG). The type-3 wind turbine use doubly fed induction generators (DFIG) with power converters (33% of wind turbine rated power) which

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