Singapore (EMA Transmission Code App. F6) — ride-through requirements

The FRT envelope a grid-scale battery must meet under Singapore (EMA Transmission Code App. F6), digitized breakpoint by breakpoint and checked against the clause it came from.

By Sergey Syrvachev — Director of Product Engineering at HyperStrong

Applies to: transmission connections — Generating units and ESS on the SG transmission system.

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. Some values on this page are marked partial: the level is confirmed but at least one duration step could not be read directly from the 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
frequency ride-through (FRT)ride-throughHigh: 0.1s → 52 Hz; 3600s → 52 Hz | Low: 0.1s → 47 Hz; 20s → 47 Hz; 20.001s → 47.5 Hzpartial

Where these values come from

  • FRTEnergy Market Authority of Singapore, Transmission Code, 26 September 2024, Appendix F, section F6.1–F6.2 'Frequency Range of Generating Unit' (p.79): F6.1 normal 49.5–50.5 Hz, exceptional rise to 52 Hz / fall to 47 Hz; F6.2 table — '52 Hz – 47.5 Hz: Continuous operation is required'; '47.5 Hz – 47 Hz: Generating unit is required to remain in operation for at least 20 seconds each time frequency falls below 47.5Hz'. ESS definition in section 1.3; Appendix L3.

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 Singapore compares

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

Other grid codes in Asia-Pacific