NERC PRC-029-1 (Table 1: AC-connected wind IBR /…) — ride-through requirements

The LVRT envelope a grid-scale battery must meet under NERC PRC-029-1 (Table 1: AC-connected wind IBR /…) (US), digitized breakpoint by breakpoint and checked against the clause it came from.

By Sergey Syrvachev — Director of Product Engineering, grid-scale BESS · 10+ GWh delivered

Part of: the grid-code ride-through chart — compare this against 63 other standards in 42 countries.

What this is, and is not. A reading aid compiled from the clause cited below — not a compliance document. The primary text governs. Every value here was read from a current primary source.

Breakpoints

Times are seconds from the start of the disturbance. Voltage is per-unit of nominal; frequency in hertz. An LVRT curve is a lower boundary (stay connected while voltage is on or above it), an HVRT curve an upper boundary, and FRT gives the band between its High and Low boundaries.

Event Duty Breakpoints Status
low-voltage ride-through (LVRT) ride-through 0.001s → 0 pu; 0.16s → 0 pu; 0.161s → 0.25 pu; 1.2s → 0.25 pu; 1.201s → 0.5 pu; 2.5s → 0.5 pu; 2.501s → 0.7 pu; 3s → 0.7 pu; 3.001s → 0.9 pu verified

Where these values come from

  • LVRT NERC Reliability Standard PRC-029-1, Attachment 1, Table 1 ("Voltage Ride-through Requirements for AC-Connected Wind IBR"), p.12; applicability per Attachment 1 note 1. FERC Order No. 909, RM25-3-000; effective 1 Oct 2026.

Last checked against the source document on .

Other grid codes in North America