Nigeria (TCN Grid Code) — ride-through requirements

The LVRT, HVRT, FRT envelopes a grid-scale battery must meet under Nigeria (TCN Grid Code), 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 — Power Park Modules on the TCN 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
low-voltage ride-through (LVRT)ride-through0.001s → 0 pu; 0.15s → 0 pu; ↗ 2s → 0.85 pu; 20s → 0.85 puverified
high-voltage ride-through (HVRT)ride-through0.001s → 1.2 pu; 2s → 1.2 pu; 2.001s → 1.1 pupartial
frequency ride-through (FRT)ride-throughHigh: 0.1s → 51.75 Hz; 15s → 51.5 Hz | Low: 0.1s → 47.5 Hz; 15s → 47.5 Hzverified

Where these values come from

  • LVRTThe Grid Code for the Nigeria Electricity Transmission System, NERC, published 01-08-2018 (cover 'Version 03', page footers 'Version 02'), clause 12.6.9(a)-(c) and Figure 1 'Voltage Fault Ride Through requirement for Power Park Modules' (p.63); Vmin from Table 1, subsection 10.1.5 (p.47).
  • HVRTNigeria Grid Code (NERC, 01-08-2018), clause 12.6.9(d) and Figure 1 HVRT limb; Vmax from Table 1, subsection 10.1.5.
  • FRTNigeria Grid Code (NERC, 01-08-2018), clause 12.6.5 (corroborated by clause 10.1.4).

Last checked against the source document on .

How Nigeria compares

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

Other grid codes in Africa