South Korea (KEPCO) — ride-through requirements

The LVRT, HVRT, FRT envelopes a grid-scale battery must meet under South Korea (KEPCO) (South Korea), 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. 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.

Event Duty Breakpoints Status
low-voltage ride-through (LVRT) ride-through 0.001s → 0 pu; 0.15s → 0 pu; 0.151s → 0.5 pu; 0.16s → 0.5 pu; 0.161s → 0.7 pu; 1.5s → 0.7 pu; 1.501s → 0.9 pu verified
high-voltage ride-through (HVRT) ride-through 0.001s → 1.2 pu; 0.2s → 1.2 pu; 0.201s → 1.1 pu verified
frequency ride-through (FRT) ride-through High: 0.1s → 61.5 Hz | Low: 0.1s → 57 Hz; 299s → 57 Hz; 299.001s → 57.5 Hz partial

Where these values come from

  • LVRT KEPCO 분산형전원 배전계통 연계 기술기준 (업무표준 H0-배전-기준-0015, 개정 14, 2021-06-01), 제24조 (계통연계 유지 / Fault Ride-Through), <표 2.7> 비정상 전압에 대한 운전지속시간: V<50 → 0.15 s; 50<=V<70 → 0.16 s; 70<=V<90 → 1.5 s; 110<V<120 → 0.2 s; V>=120 → none. (Trip table <표 2.4> is separate.).
  • HVRT KEPCO 분산형전원 배전계통 연계 기술기준 (개정 14, 2021-06-01), <표 2.7>: 110 < V < 120 → 운전지속시간 0.2초; V >= 120 → '-' (no ride-through). Complementary trip table <표 2.4>: V>=120 → 분리시간 0.16 s.
  • FRT KEPCO 분산형전원 배전계통 연계 기술기준 (개정 14, 2021-06-01), <표 2.8> 비정상 주파수에 대한 운전지속시간: f > 61.5 → '-'; and <표 2.5> 비정상 주파수에 대한 분리시간: f > 61.5 → 0.16초. One boundary is a single level; no further duration steps digitized.

Last checked against the source document on .

Other grid codes in Asia-Pacific