NERC PRC-029-1 (IBR) — ride-through requirements

The LVRT, HVRT, FRT envelopes a grid-scale battery must meet under NERC PRC-029-1 (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; 0.32s → 0 pu; 0.321s → 0.25 pu; 1.2s → 0.25 pu; 1.201s → 0.5 pu; 3s → 0.5 pu; 3.001s → 0.7 pu; 6s → 0.7 pu; 6.001s → 0.9 pu verified
high-voltage ride-through (HVRT) ride-through 0.001s → 1.2 pu; 1s → 1.2 pu; 1.001s → 1.1 pu; 1800s → 1.1 pu; 1800s → 1.05 pu verified
frequency ride-through (FRT) ride-through High: 0.1s → 61.8 Hz; 299s → 61.8 Hz; 299.001s → 61.2 Hz | Low: 0.1s → 57 Hz; 299s → 57 Hz; 299.001s → 58.8 Hz verified

Where these values come from

  • LVRT NERC PRC-029-1, Attachment 1 'Voltage Ride-Through Criteria', Table 2 'Voltage Ride-through Requirements for All Other IBR' (p.12), with Boundary Details bullets 2(b) (PV+BESS → Table 2), 7 and 11 (p.13).
  • HVRT NERC PRC-029-1, Attachment 1, Table 2 'Voltage Ride-through Requirements for All Other IBR' (p.12), rows '>1.20 N/A', '>1.10 Mandatory Operation Region 1.0', '>1.05 Continuous Operation Region 1800'.
  • FRT NERC PRC-029-1, Attachment 2 'Frequency Ride-Through Criteria', Table 3 'Frequency Ride-through Capability Requirements' and Figure 1 'PRC-029 Frequency Ride-through Requirements' (p.14); Requirement R3 caps applicability at RoCoF ≤ 5 Hz/s.

Last checked against the source document on .

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