Denmark (TR 3.3.1) — ride-through requirements

The LVRT, FRT envelopes a grid-scale battery must meet under Denmark (TR 3.3.1), digitized breakpoint by breakpoint and checked against the clause it came from.

By Sergey Syrvachev — Director of Product Engineering at HyperStrong

Applies to: both connections — Battery plants; cited tables are the transmission-connected rows.

Part of: the grid-code ride-through chart — compare this against 65 other standards in 44 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. These are the boundaries, not the behaviour: what holding one demands of the converter — reactive current injection, thermal stress, protection timing — is stepped through in the LVRT / HVRT ride-through visual.

EventDutyBreakpointsStatus
low-voltage ride-through (LVRT)ride-through0.001s → 0 pu; 0.15s → 0 pu; ↗ 1.5s → 0.85 puverified
frequency ride-through (FRT)ride-throughHigh: 0.1s → 51.5 Hz; 1800s → 51 Hz | Low: 0.1s → 47.5 Hz; 1800s → 48.5 Hz; 3600s → 49 Hzverified

Where these values come from

  • LVRTEnerginet Technical Regulation 3.3.1 – Revision 6 (14 Feb 2025, effective 1 May 2025), Part 16, section 128(1) and Table 45 (DK1); section 129(1) and Table 46 (DK2); cf. sections 90/114 Tables 39/40/43/44 for distribution-connected categories. The code defines a linear recovery ramp; the vertices are read from the clause and the chart draws the segment between them.
  • FRTEnerginet Technical Regulation 3.3.1 – Revision 6, Tables 30/32/34/36 (normal frequency operating range, transmission-connected, DK1 and DK2: 47.5–48.5 or 47.5–48.0 / 30 min, 48.5–49.0 or 48.0–49.0 / 30 min, 49.0–51.0 unlimited, 51.0–51.5 / 30 min) and section 68(1)/69(1) proviso on 60 minutes below 49.00 Hz; protection settings f< 47.5 Hz / 200 ms and f> 51.5 Hz / 200 ms are separate trip settings.

Any event not in the table above is not plotted for this code. Where an absence is itself the finding — a code that defines no high-voltage envelope, or one whose curves circulate under another country's name — it is recorded in the grid codes with no ride-through curve.

Last checked against the source document on .

How Denmark compares

Each event this code defines, put side by side with every other code that defines it:

Other grid codes in Europe