Italy (TERNA) — ride-through requirements

The LVRT, HVRT envelopes a grid-scale battery must meet under Italy (TERNA) (Italy), 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; 0.2s → 0 pu; 0.4s → 0.094 pu; 0.6s → 0.189 pu; 0.8s → 0.283 pu; 1s → 0.378 pu; 1.2s → 0.472 pu; 1.4s → 0.567 pu; 1.6s → 0.661 pu; 1.8s → 0.756 pu; 2s → 0.85 pu verified
high-voltage ride-through (HVRT) ride-through 0.001s → 1.3 pu; 0.1s → 1.2 pu; 1s → 1.15 pu verified

Where these values come from

  • LVRT Terna Allegato A.79 Rev. 00, Marzo 2023, §6.4 'Insensibilità alle variazioni di tensione', Fig. 1 'Caratteristica FRT per Impianti di Accumulo' and Tabella 1 'Parametri FRT' (tA = 200 ms; tB = 2 s / 2,8 s / 4 s); same values in the June 2022 consultation text (Tabella 2).
  • HVRT Terna Allegato A.79 Rev. 00, Marzo 2023, Fig. 1 'Caratteristica FRT per Impianti di Accumulo' (curva OVRT: 1,3 / 1,2 / 1,15 pu with footnote '1,1 se il punto di connessione è a tensione superiore o uguale 300 kV') and Tabella 1 (tC = 100 ms, tD = 1 s).

Last checked against the source document on .

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