Brazil (ONS Submódulo 2.10) — ride-through requirements

The LVRT, HVRT, FRT envelopes a grid-scale battery must meet under Brazil (ONS Submódulo 2.10), 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

Applies to: transmission connections — Converter-connected wind and PV plants joining the transmission system (Rede Básica, ICG or DIT).

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. 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 → 0.2 pu; 0.5s → 0.2 pu; ↗ 1s → 0.85 pu; 5s → 0.85 pu; 5.001s → 0.9 puverified
high-voltage ride-through (HVRT)ride-through0.001s → 1.2 pu; 2.5s → 1.2 pu; 2.501s → 1.1 puverified
frequency ride-through (FRT)ride-throughHigh: 0.1s → 63 Hz; 10s → 63 Hz; 10.001s → 62.5 Hz | Low: 0.1s → 56 Hz; 20s → 56 Hz; 20.001s → 58.5 Hzverified

Where these values come from

  • LVRTONS, Procedimentos de Rede, Submódulo 2.10 'Requisitos técnicos mínimos para a conexão às instalações de transmissão', Revisão 2025.02 (aprovada pela REN ANEEL nº 1.112/2025 de 11/02/2025; vigência 01/03/2025), item 5.7 'Suportabilidade a subtensões e sobretensões dinâmicas' and Figura 13 'Tensão nos terminais dos aerogeradores ou inversores da central geradora' — lower boundary. The clause states no numbers; every value is read from the figure. Measured at the wind turbine or inverter terminals, not at the point of connection, and satisfied by the phase with the largest variation. Section 5 governs converter-connected wind and photovoltaic plants; synchronous hydro and thermal plant follow item 4.2 with materially different bands. Current index: https://www.ons.org.br/paginas/sobre-o-ons/procedimentos-de-rede/vigentes. Supersedes Submódulo 3.6 rev. 2019.08, whose numbering now belongs to an unrelated submodule on system-service charges.
  • HVRTONS, Procedimentos de Rede, Submódulo 2.10 'Requisitos técnicos mínimos para a conexão às instalações de transmissão', Revisão 2025.02 (aprovada pela REN ANEEL nº 1.112/2025 de 11/02/2025; vigência 01/03/2025), item 5.7 'Suportabilidade a subtensões e sobretensões dinâmicas' and Figura 13 — upper boundary of the must-remain-in-operation region: 1,20 pu to 2,5 s, then 1,10 pu. The clause states no numbers; every value is read from the figure. Section 5 governs converter-connected wind and photovoltaic plants; synchronous hydro and thermal plant follow item 4.2 with materially different bands. Current index: https://www.ons.org.br/paginas/sobre-o-ons/procedimentos-de-rede/vigentes. Supersedes Submódulo 3.6 rev. 2019.08, whose numbering now belongs to an unrelated submodule on system-service charges.
  • FRTONS, Procedimentos de Rede, Submódulo 2.10 'Requisitos técnicos mínimos para a conexão às instalações de transmissão', Revisão 2025.02 (aprovada pela REN ANEEL nº 1.112/2025 de 11/02/2025; vigência 01/03/2025), item 5.2.1 'Operação em regime de frequência não nominal' sub-items (a)-(e), summarised by Figura 5 'Faixas de operação da central geradora em regime de frequência não nominal': instantaneous disconnection permitted below 56 Hz; below 58,5 Hz for at least 20 s; 58,5-62,5 Hz unlimited; above 62,5 Hz for at least 10 s; instantaneous disconnection permitted above 63 Hz. Sub-item (d) adds that the overfrequency trip delay is set from a dynamic-performance study, so the 10 s is a floor rather than the setting. Section 5 governs converter-connected wind and photovoltaic plants; synchronous hydro and thermal plant follow item 4.2 with materially different bands. Current index: https://www.ons.org.br/paginas/sobre-o-ons/procedimentos-de-rede/vigentes. Supersedes Submódulo 3.6 rev. 2019.08, whose numbering now belongs to an unrelated submodule on system-service charges.

Last checked against the source document on .

Other grid codes in South America