Norway (Statnett NVF 2025) ride-through requirements
Low-voltage ride-through, Frequency ride-through for Norway. Every breakpoint below is read from the code itself, and carries the clause it came from — so you can check it, not just cite it.
What is the low-voltage ride-through envelope for Norway (Statnett NVF 2025)?
The plant must ride through for any voltage that stays on or above this envelope. The envelope holds 0 pu from t = 0 to 150 ms; then ramps linearly from 0 pu at 150 ms to 0.9 pu at 1.5 s; then 0.9 pu from 1.5 s onward — the last band the envelope defines, with no stated end time.
The clause states this boundary as a line; intermediate points are interpolated between its stated vertices.
Applies to Type D power park modules, ≥110 kV
| From | To | Voltage | Between the points |
|---|---|---|---|
| 0 | 150 ms | 0 pu | Held flat |
| 150 ms | 1.5 s | 0 → 0.9 pu | Ramps linearly |
| 1.5 s | no stated end | 0.9 pu | Held flat |
The clause this came from
Statnett, 'NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet' (ref. 2024/2852), gjeldende fra 13.06.2025 - kapittel 14.6.1, Tabell 14-15 (column 'Type D >= 110 kV') and Figur 14-11, with conditions per Tabell 14-16.
What is the frequency ride-through envelope for Norway (Statnett NVF 2025)?
The plant must ride through between the upper and lower bands. The upper (over-frequency) band holds 52.5 Hz from t = 0 to 30 min; then 51 Hz from 30 min onward — the last band the envelope defines, with no stated end time. The lower (under-frequency) band holds 47.5 Hz from t = 0 to 30 min; then 49 Hz from 30 min onward — the last band the envelope defines, with no stated end time.
Every breakpoint is stated in the clause cited below.
Applies to Type D power park modules, ≥110 kV
Upper limit
| From | To | Frequency | Between the points |
|---|---|---|---|
| 0 | 30 min | 52.5 Hz | Held flat |
| 30 min | no stated end | 51 Hz | Held flat |
Lower limit
| From | To | Frequency | Between the points |
|---|---|---|---|
| 0 | 30 min | 47.5 Hz | Held flat |
| 30 min | no stated end | 49 Hz | Held flat |
The clause this came from
Statnett, 'NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet' (ref. 2024/2852), gjeldende fra 13.06.2025 - kapittel 14.1.3, Tabell 14-5.
How long must the plant keep operating outside nominal voltage under Norway (Statnett NVF 2025)?
The ride-through envelopes above answer how deep a disturbance the plant must survive. These bands answer the other question Norway (Statnett NVF 2025) settles: how long it must keep operating at a voltage that is off nominal but steady.
A blue band ending in an arrow runs on, because the code states no end for it; a copper bar stops at the time the code prints, and only that right-hand end is data — every bar starts at the left edge of the axis.
Statnett's national functional requirement (NVF 2025, Tabell 14-2), a minimum-capability duty. The 60-minute cell carries a footnote in the table itself — «Gjelder spenningsnivå 110, 132 og 220 kV» — so that band is the duty at those three levels and not at the others.
Steady-state voltage operating bands — Kraftpark with park transformer (60-min step at 110/132/220 kV)
Voltage in p.u. as Tabell 14-2 states the bands, for a kraftpark WITH a park transformer
Operating requirements beyond the envelopes.
The figures above are what Norway (Statnett NVF 2025) demands during a disturbance and while it sits off nominal. The rows below are the same regime’s operating and fault-response requirements — reactive capability, frequency response, continuous operating range, ramp rate, RoCoF withstand and fault-current injection — each researched from the document its own row cites, separately from the plotted corpus. Every row carries its clause and a verbatim quote, so you can check it the same way, including the continuous-operating-range row the staircases above are drawn from.
| Requirement | What the code states | Clause |
|---|---|---|
| Reactive design at Pmaks: default ±0.33 Pmaks, operator range to 0.75 Reactive capability | Default (unless TSO decides otherwise): Qkap,maks/Pmaks ≥ 0.33 and Qind,maks/Pmaks ≥ 0.33 at PCC, cos φ ≤ 0.95, at UPCC = 1.0 pu; >85 % of the reactive reserve must be dynamic; TSO may instead fix the requirement anywhere within Q/Pmaks = 0.75–0.33 (cos φ 0.8–0.95), basis Pmaks Binds kraftparker of type B, C and D at PCC (POC instead where the production radial is a cable connection, kap. 14.5.1.2); referenced to Pmaks and nominal voltage UPCC = 1,0 pu. Per Tabell 14-11 all three types are marked '(X)': for type B the konsesjonær may request behovsprøving, for C and D the TSO (systemansvarlig) may behovsvurdere; the general Tabell 14-13 values apply unless the TSO decides otherwise, and Statnett states a new kraftpark gives no room to deviate from the general requirement (14.5.1.2). Symmetric capacitive/inductive; no charge/discharge asymmetry stated. Storage binds explicitly: NVF 2025 kap. 14 states that energilagringssystemer/batterilagringssystemer are covered as 'kraftpark' and are classified and requirement-set like other production plants per Tabell 11-1 (type B 1,5-10 MW, C 10-30 MW, D ≥30 MW or Un ≥ 110 kV; NVF PDF p. 192 and p. 110). Legal chain: fos (forskrift om systemansvaret i kraftsystemet) para 14 -> Statnett's retningslinjer for fos para 14 (approved by RME per fos para 28a) -> NVF 2025 as vedlegg (annex) -> Del IV kap. 14 kraftparker, which explicitly includes battery/energy storage. Not an RfG implementation: NVF kap. 1.5.1 states the EU connection codes are not part of Norwegian law; RfG article references in the kap. 14 tables are informational cross-references only. The voltage reference (UPCC = 1.0 pu) is stated in the same Tabell 14-13 but is not carried in the quoted table rows. The doubled article 'den den' in the quote is as printed in the source; the translation's 'the the' reproduces it. | NVF 2025 (gjeldende fra 13.06.2025), kap. 14.5.1.1 with Tabell 14-12 and Tabell 14-13, side 187-188 (PDF p. 199-200) + NVF 2025, Tabell 14-12 ('Grenser for reaktiv ytelse, innenfor hvilke systemansvarlig skal fastsette krav til kraftparker. Referert PCC.'), side 187 (PDF p. 199) |
The clauses this row citesNVF 2025 (gjeldende fra 13.06.2025), kap. 14.5.1.1 with Tabell 14-12 and Tabell 14-13, side 187-188 (PDF p. 199-200) — “ Systemansvarlig kan fastsette kravet innenfor grensene gitt av Tabell 14-12. Dersom ikke annet er besluttet av systemansvarlig, gjelder krav til reaktiv dimensjonering iht. Tabell 14-13. Dersom ikke annet er fastsatt av systemansvarlig, skal >85 % av den den reaktive reserven være dynamisk (ikke statiske komponenter som kondensatorbatterier). [Tabell 14-13:] Kapasitiv ytelse: Qkap,maks/Pmaks ≥ 0,33, cos φ ≤ 0,95; Induktiv ytelse: Qind,maks/Pmaks ≥ 0,33, cos φ ≤ 0,95 ” Translation: “ The system operator may set the requirement within the limits given by Table 14-12. Unless otherwise decided by the system operator, the reactive dimensioning requirements per Table 14-13 apply. Unless otherwise determined by the system operator, >85 % of the the reactive reserve shall be dynamic (not static components such as capacitor banks). [Table 14-13:] Capacitive capability: Qkap,maks/Pmaks ≥ 0,33, cos φ ≤ 0,95; Inductive capability: Qind,maks/Pmaks ≥ 0,33, cos φ ≤ 0,95 ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) NVF 2025, Tabell 14-12 ('Grenser for reaktiv ytelse, innenfor hvilke systemansvarlig skal fastsette krav til kraftparker. Referert PCC.'), side 187 (PDF p. 199) — “ TABELL 14-12: GRENSER FOR REAKTIV YTELSE, INNENFOR HVILKE SYSTEMANSVARLIG SKAL FASTSETTE KRAV TIL KRAFTPARKER. REFERERT PCC. [rows:] Kapasitiv ytelse: Qkap,maks/Pmaks = 0,75 − 0,33, cos φkap = 0,8 − 0,95; Induktiv ytelse: Qind,maks/Pmaks = 0,75 − 0,33, cos φind = 0,8 − 0,95 ” Translation: “ TABLE 14-12: LIMITS FOR REACTIVE CAPABILITY, WITHIN WHICH THE SYSTEM OPERATOR SHALL SET REQUIREMENTS FOR POWER PARKS. REFERRED TO PCC. [rows:] Capacitive capability: Qkap,maks/Pmaks = 0,75 − 0,33, cos φkap = 0,8 − 0,95; Inductive capability: Qind,maks/Pmaks = 0,75 − 0,33, cos φind = 0,8 − 0,95 ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) | ||
| Full Q at partial load; STATCOM duty at 0 ≤ P < Pmin Reactive capability | For Pmin ≤ P < Pmaks the reactive capability must be at least that at P = Pmaks (rectangular P-Q envelope, basis Pmaks, at PCC); STATCOM operation (reactive regulation at 0 ≤ P < Pmin, incl. zero active output) required for type C and D, and for type B unless otherwise approved by the TSO 14.5.2 binds type C and D firm ('X'), type B behovsprøves ('(X)'), per Tabell 14-11; capability referenced to all kraftpark modules in service. 14.5.3 STATCOM-drift is a firm requirement for C and D and applies to B unless the TSO approves otherwise (new NVF 2025 requirement, marked with the NVF-2025 change symbol); the P-Q/Pmaks diagram shape below Pmin follows the park's technical capability (Figur 14-9). Highly relevant to BESS at zero active power. Storage binds explicitly: NVF 2025 kap. 14 states that energilagringssystemer/batterilagringssystemer are covered as 'kraftpark' and are classified and requirement-set like other production plants per Tabell 11-1 (type B 1,5-10 MW, C 10-30 MW, D ≥30 MW or Un ≥ 110 kV; NVF PDF p. 192 and p. 110). The operator '≤<' in the quote is as printed in the source body text (a typo — the section heading reads 'Reaktiv ytelse ved Pmin ≤ P < Pmaks'). | NVF 2025 (gjeldende fra 13.06.2025), kap. 14.5.2.1, side 189 (PDF p. 201) + NVF 2025, kap. 14.5.3.1 (STATCOM-drift ved 0 ≤ P < Pmin), side 190 (PDF p. 202) |
The clauses this row citesNVF 2025 (gjeldende fra 13.06.2025), kap. 14.5.2.1, side 189 (PDF p. 201) — “ Den reaktive ytelsen mellom minimal og maksimal aktiv effektproduksjon, Pmin ≤< P < Pmaks, skal være minst den samme som ved P = Pmaks, ref. alle kraftparkmoduler i drift. Dette er illustrert i Figur 14-8. ” Translation: “ The reactive capability between minimum and maximum active power production, Pmin ≤< P < Pmaks, shall be at least the same as at P = Pmaks, ref. all power-park modules in operation. This is illustrated in Figure 14-8. ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) NVF 2025, kap. 14.5.3.1 (STATCOM-drift ved 0 ≤ P < Pmin), side 190 (PDF p. 202) — “ Kraftparker av type C og D skal kunne operere som STATCOM. Anlegg av type B skal også kunne operere som STATCOM med mindre noe annet er godkjent av systemansvarlig. STATCOM-drift betegnes av kraftparkens mulighet til å levere reaktiv regulering (spennings-, MVAr- eller cosφ-kontroll) selv om aktiv effektproduksjon hos én, flere eller alle kraftparkmoduler er null. ” Translation: “ Power parks of type C and D shall be able to operate as a STATCOM. Installations of type B shall also be able to operate as a STATCOM unless otherwise approved by the system operator. STATCOM operation denotes the power park's ability to deliver reactive regulation (voltage, MVAr or cos φ control) even when the active power production of one, several or all power-park modules is zero. ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) | ||
| Reactive response: 90 % within 1.0 s on 2 % voltage step Reactive capability | Reactive power response at PCC reaching 90 % of steady-state value within 1.0 s for a voltage step of 2 % of nominal voltage Binds kraftparker of type B, C and D without reservation ('X' in all three columns of Tabell 14-10); measured at PCC. This is the dynamic-response counterpart to the 14.5 capability requirements and applies in voltage-control mode (Figur 14-6 shows the -/+2 % step envelope). Storage binds explicitly: NVF 2025 kap. 14 states that energilagringssystemer/batterilagringssystemer are covered as 'kraftpark' and are classified and requirement-set like other production plants per Tabell 11-1 (type B 1,5-10 MW, C 10-30 MW, D ≥30 MW or Un ≥ 110 kV; NVF PDF p. 192 and p. 110). | NVF 2025 (gjeldende fra 13.06.2025), kap. 14.4.1.1 (Reguleringsevne - reaktiv effekt), side 185 (PDF p. 197) |
The clause this row citesNVF 2025 (gjeldende fra 13.06.2025), kap. 14.4.1.1 (Reguleringsevne - reaktiv effekt), side 185 (PDF p. 197) — “ Kraftparker skal kunne levere en reaktiv effektrespons i PCC som gir 90 % av stasjonær verdi innen 1,0 sekund ved et spenningssprang på 2 % av nominell spenning. Dette er vist i Figur 14-6. ” Translation: “ Power parks shall be able to deliver a reactive power response at the PCC that reaches 90 % of the steady-state value within 1,0 second for a voltage step of 2 % of nominal voltage. This is shown in Figure 14-6. ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) | ||
| Frequency control: droop 2-12 %, deadband 0-0.5 Hz, 90 % in <4 s Frequency response | Droop (statikk) adjustable at least over 2–12 %, deadband adjustable 0–0.5 Hz; for a frequency step giving 10 % steady-state active-power response at POC, 90 % of the response within t2 < 4 s with delay t1 < 2 s, valid across the whole operating range given reserves toward Pmin and Pmaks Park controller (parkregulator) must have a frequency-control loop giving a steady-state ΔP as function of Δf outside the deadband; settable per Tabell 14-8. Symmetric: at over-frequency regulate down to Pmin and hold; at under-frequency regulate up to Pmaks and hold (14.2.2.1). Binds type C and D firm, type B behovsprøves ('(X)') per Tabell 14-7 (rows 14.2.2 and 14.3). No LFSM-O/LFSM-U/FSM construct and no sustain time is used; NVF frames one national frekvensregulering requirement, and FCR-N/FCR-D market terms are explicitly outside these funksjonskrav (kap. 14.2.2 intro). Storage binds explicitly: NVF 2025 kap. 14 states that energilagringssystemer/batterilagringssystemer are covered as 'kraftpark' and are classified and requirement-set like other production plants per Tabell 11-1 (type B 1,5-10 MW, C 10-30 MW, D ≥30 MW or Un ≥ 110 kV; NVF PDF p. 192 and p. 110). | NVF 2025 (gjeldende fra 13.06.2025), kap. 14.2.2.1 with Tabell 14-8, side 183 (PDF p. 195) + NVF 2025, kap. 14.3.1.1 (Reguleringsevne – frekvensregulering), side 185 (PDF p. 197) |
The clauses this row citesNVF 2025 (gjeldende fra 13.06.2025), kap. 14.2.2.1 with Tabell 14-8, side 183 (PDF p. 195) — “ Parkregulator skal ha funksjonalitet for frekvensregulering. Regulatorens frekvensreguleringssløyfe skal gi et stasjonært bidrag, ∆P, som funksjon av frekvensen, ∆f, utenfor dødbåndet, ∆fdb. Dette er illustrert i Figur 14-3. Parametere for statikk og dødbånd skal kunne stilles inn iht. Tabell 14-8. [Tabell 14-8, Innstillingsmuligheter (minimum):] Dødbånd, ∆fdb: 0 – 0,5 Hz; Statikk, bp: 2-12 % ” Translation: “ The park controller shall have functionality for frequency regulation. The controller's frequency-regulation loop shall give a steady-state contribution, ∆P, as a function of the frequency, ∆f, outside the deadband, ∆fdb. This is illustrated in Figure 14-3. Parameters for droop and deadband shall be settable per Table 14-8. [Table 14-8, setting ranges (minimum):] Deadband, ∆fdb: 0 – 0,5 Hz; Droop, bp: 2-12 % ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) NVF 2025, kap. 14.3.1.1 (Reguleringsevne – frekvensregulering), side 185 (PDF p. 197) — “ Ved et frekvenssteg som stasjonært gir 10 % aktiv effektrespons i POC, ∆Pss, skal 90 % av responsen utreguleres innen t2 < 4 sekunder, med forsinkelse t1 < 2 sekunder. Kravet gjelder for hele driftsområdet til kraftparken, forutsatt reserver mot Pmin og Pmaks. ” Translation: “ For a frequency step that in steady state gives a 10 % active-power response at the POC, ∆Pss, 90 % of the response shall be delivered within t2 < 4 seconds, with a delay t1 < 2 seconds. The requirement applies to the power park's entire operating range, provided reserves toward Pmin and Pmaks. ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) | ||
| Frequency and voltage operating bands Continuous operating range | Frequency: 49.0–51.0 Hz unlimited; 47.5–49.0 Hz, 51.0–51.5 Hz and 51.5–52.5 Hz each 30 minutes (valid for voltage varying 0.9–1.05 pu). Voltage (kraftpark with park transformer): 0.9–1.05 p.u. unlimited; 1.05–1.10 p.u. 60 minutes, the latter only at 110/132/220 kV levels Binds kraftparker of type B, C and D ('X' in Tabell 14-1 rows 14.1.2 and 14.1.3). Frequency bands are withstand bands ('skal minst tåle drift'), and the TSO may require wider bands where needed for system operation (14.1.3.1). Voltage referred per Tabell 14-4 maximum continuous voltages (e.g. 420/300 kV nets have no 60-min band; 132 kV net: 138 kV continuous / 145 kV 60 min); parks without park transformer get only 0,9-1,05 pu unlimited (Tabell 14-3); operating voltage at POC per netteier must additionally be respected. Storage binds explicitly: NVF 2025 kap. 14 states that energilagringssystemer/batterilagringssystemer are covered as 'kraftpark' and are classified and requirement-set like other production plants per Tabell 11-1 (type B 1,5-10 MW, C 10-30 MW, D ≥30 MW or Un ≥ 110 kV; NVF PDF p. 192 and p. 110). | NVF 2025 (gjeldende fra 13.06.2025), kap. 14.1.3.1 with Tabell 14-5, side 181-182 (PDF p. 193-194) + NVF 2025, kap. 14.1.2.1 with Tabell 14-2, side 181 (PDF p. 193) |
The clauses this row citesNVF 2025 (gjeldende fra 13.06.2025), kap. 14.1.3.1 with Tabell 14-5, side 181-182 (PDF p. 193-194) — “ Kraftparken skal minst tåle drift i frekvensområdene gitt av tabell 14-5, og ellers ikke begrenses unødig. Kravene gjelder for varierende spenning i området 0,9 − 1,05 pu. Systemansvarlig kan kreve bredere frekvensbånd enn det som er angitt av Tabell 14-5, dersom det er vurdert nødvendig av hensyn til systemdriften. [Tabell 14-5:] 47,5-49,0 Hz: 30 minutter; 49,0-51,0 Hz: Ubegrenset; 51,0-51,5 Hz: 30 minutter; 51,5-52,5 Hz: 30 minutter ” Translation: “ The power park shall as a minimum withstand operation in the frequency ranges given by Table 14-5, and otherwise not be unduly limited. The requirements apply for voltage varying in the range 0,9 − 1,05 pu. The system operator may require wider frequency bands than stated in Table 14-5, if judged necessary for system operation. [Table 14-5:] 47,5-49,0 Hz: 30 minutes; 49,0-51,0 Hz: Unlimited; 51,0-51,5 Hz: 30 minutes; 51,5-52,5 Hz: 30 minutes ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) NVF 2025, kap. 14.1.2.1 with Tabell 14-2, side 181 (PDF p. 193) — “ Kraftparken skal minst kunne drifte innen spenningsområdene og tidene gitt av Tabell 14-2 og ellers ikke begrenses unødig innenfor elektromekaniske egenskaper. [Tabell 14-2:] 0,9-1,05 p.u.: Ubegrenset; 1,05-1,10 p.u.: 60 minutter *); *) Gjelder spenningsnivå 110, 132 og 220 kV. ” Translation: “ The power park shall as a minimum be able to operate within the voltage ranges and durations given by Table 14-2 and otherwise not be unduly limited within its electromechanical capabilities. [Table 14-2:] 0,9-1,05 p.u.: Unlimited; 1,05-1,10 p.u.: 60 minutes *); *) Applies to voltage levels 110, 132 and 220 kV. ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) | ||
| Ramp control: adjustable, no numeric limit Ramp rate | No numeric ramp-rate limit is prescribed in NVF 2025; kraftparker must have functionality to set the power ramp (ramp rate) on active-power setpoint changes, and to limit output below instantaneous available power anywhere between Pmin and Pmaks Binds type C and D firm ('X'), type B behovsprøves ('(X)') per Tabell 14-7. The requirement is capability-only (settable ramp rate); actual ramp values are set operationally, not in NVF. No separate charge/discharge ramp treatment - chapter 14 frames requirements in terms of power delivered to the grid. Storage binds explicitly: NVF 2025 kap. 14 states that energilagringssystemer/batterilagringssystemer are covered as 'kraftpark' and are classified and requirement-set like other production plants per Tabell 11-1 (type B 1,5-10 MW, C 10-30 MW, D ≥30 MW or Un ≥ 110 kV; NVF PDF p. 192 and p. 110). | NVF 2025 (gjeldende fra 13.06.2025), kap. 14.2.1.1 (Aktiv effektregulering - ramping), side 182 (PDF p. 194) |
The clause this row citesNVF 2025 (gjeldende fra 13.06.2025), kap. 14.2.1.1 (Aktiv effektregulering - ramping), side 182 (PDF p. 194) — “ Kraftparker skal ha funksjonalitet for å bestemme effektrampen (ramp rate) ved endring av effektsettpunkt. Kraftparker skal ha funksjonalitet for å begrense produsert effekt under momentant maksimale tilgjengelige effekt, ved å innstille effektsettpunkt i hele driftsområdet mellom Pmin og Pmaks. ” Translation: “ Power parks shall have functionality to determine the power ramp (ramp rate) when changing the power setpoint. Power parks shall have functionality to limit produced power below the instantaneous maximum available power, by setting the power setpoint anywhere in the operating range between Pmin and Pmaks. ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) | ||
| RoCoF withstand ±1.5 Hz/s over 1 s RoCoF withstand | ±1.5 Hz/s RoCoF, measured over Δt = 1 s, with operation at minimum without limitations; ability to ride larger fast frequency changes must not be unduly limited Binds kraftparker of type B, C and D ('X' in all three columns of Tabell 14-1). Figur 14-2 illustrates: if the frequency trajectory stays above a line falling at 1,5 Hz/s the unit shall operate normally. Measuring window stated explicitly (1 s). For comparison, NVF gives HVDC systems stricter three-tier limits — ±5 Hz/s over 0,25 s, ±2,5 Hz/s over 0,5 s and ±1,25 Hz/s over 2 s (kap. 18.1.4.1; the forord prints only the outer two tiers) — that do not apply to kraftparker. Storage binds explicitly: NVF 2025 kap. 14 states that energilagringssystemer/batterilagringssystemer are covered as 'kraftpark' and are classified and requirement-set like other production plants per Tabell 11-1 (type B 1,5-10 MW, C 10-30 MW, D ≥30 MW or Un ≥ 110 kV; NVF PDF p. 192 and p. 110). The word 'frekvensendinger' (missing 'r') in the quote is as printed in the source. | NVF 2025 (gjeldende fra 13.06.2025), kap. 14.1.4.1 (Frekvensendringshastighet), side 182 (PDF p. 194) |
The clause this row citesNVF 2025 (gjeldende fra 13.06.2025), kap. 14.1.4.1 (Frekvensendringshastighet), side 182 (PDF p. 194) — “ Kraftparker skal minst kunne drifte uten begrensninger ved en frekvensendringshastighet (Rate of Change of Frequency – ROCOF) ∆f/∆t = ±1,5 Hz/sek målt over ∆t = 1 sek. Produksjonsenheter skal ikke unødig begrense evnene til å drifte ved større hurtige frekvensendinger. ” Translation: “ Power parks shall as a minimum be able to operate without limitations at a rate of change of frequency (Rate of Change of Frequency – ROCOF) ∆f/∆t = ±1,5 Hz/sec measured over ∆t = 1 sec. Generating units shall not unduly limit the abilities to operate at larger rapid frequency changes. ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) | ||
| Fast fault current: K = 2-8 (default 2), 90 % in <60 ms Fault-current injection | If required by TSO (type C/D): supplementary reactive current ΔIq = −K·ΔU2 for voltage deviation beyond threshold ΔU1 > 0.1 pu, gain K adjustable 2–8 with default K = 2; 90 % of maximum reactive current within t1 < 60 ms, stationary within t2 < 150 ms (±0.05 pu band around Iq,ref); asymmetric (1-/2-phase) injection may also be required Binds kraftparker of type C and D only, and only as behovsvurdering - '(X)' under C and D in Tabell 14-14, activated 'dersom dette kreves av systemansvarlig'; no marking for type B. Contribution is supplementary to pre-fault reactive production/consumption, continuous while ΔU exceeds the 0,1 pu threshold, with ΔU2 = ΔU − ΔU1; limited by the park's ΔIq,max/ΔIq,min capability. Priority: active power shall not be reduced unnecessarily to deliver reactive fault current (14.6.2.1), and 14.6.3.1 requires recovery within 2 s after voltage is restored if output dropped inherently. Negative-sequence treatment appears only as the TSO's option to require asymmetric (1- or 2-phase) fault current. Storage binds explicitly: NVF 2025 kap. 14 states that energilagringssystemer/batterilagringssystemer are covered as 'kraftpark' and are classified and requirement-set like other production plants per Tabell 11-1 (type B 1,5-10 MW, C 10-30 MW, D ≥30 MW or Un ≥ 110 kV; NVF PDF p. 192 and p. 110). | NVF 2025 (gjeldende fra 13.06.2025), kap. 14.6.2.1 (Hurtig feilstrømbidrag), side 193 (PDF p. 205) + NVF 2025, kap. 14.6.2.1 (response-time paragraph with Figur 14-13), side 193 (PDF p. 205) |
The clauses this row citesNVF 2025 (gjeldende fra 13.06.2025), kap. 14.6.2.1 (Hurtig feilstrømbidrag), side 193 (PDF p. 205) — “ Kraftparker av type C og D skal kunne levere hurtig feilstrømbidrag, dersom dette kreves av systemansvarlig. Feilstrømbidraget er et supplementært bidrag til eventuell reaktiv produksjon/konsumpsjon før feil inntreffer, og skal gis kontinuerlig når spenningsavviket er større enn en terskel, ∆U1 > 0,1 pu. Forholdet mellom spenningsavviket fra terskelen og maksimalt feilstrømbidrag skal være innstillbart uttrykt ved en faktor, K=2-8. Dette er vist i Figur 14-12. Dersom ikke annet er bestemt av systemansvarlig skal K=2. … ΔIq = −K·ΔU2 … ΔU2 = ΔU − ΔU1 … Systemansvarlig kan også kreve at kraftpark kan levere asymmetrisk (1-fase eller 2-fase) feilstrøm. ” Translation: “ Power parks of type C and D shall be able to deliver a fast fault-current contribution, if this is required by the system operator. The fault-current contribution is a supplementary contribution to any reactive production/consumption before the fault occurs, and shall be provided continuously when the voltage deviation is greater than a threshold, ∆U1 > 0,1 pu. The relationship between the voltage deviation beyond the threshold and the maximum fault-current contribution shall be adjustable, expressed by a factor, K=2-8. This is shown in Figure 14-12. Unless otherwise determined by the system operator, K=2 shall apply. … ΔIq = −K·ΔU2 … ΔU2 = ΔU − ΔU1 … The system operator may also require that the power park can deliver asymmetric (1-phase or 2-phase) fault current. ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) NVF 2025, kap. 14.6.2.1 (response-time paragraph with Figur 14-13), side 193 (PDF p. 205) — “ Ved en stegvis endring i spenning skal 90 % av maksimal reaktiv strøm være utregulert ila. t1 < 60 ms og være stasjonært etter t2 < 150 ms, ref. Figur 14-13. Stasjonær tilstand defineres som tiden hvor feilstrøm har pendlet seg innenfor et toleransebånd på ±0,05 pu av settpunkt Iq,ref. ” Translation: “ For a stepwise change in voltage, 90 % of the maximum reactive current shall be delivered within t1 < 60 ms and be stationary after t2 < 150 ms, ref. Figure 14-13. The stationary state is defined as the time at which the fault current has settled within a tolerance band of ±0,05 pu of the setpoint Iq,ref. ” (NVF 2025 - Nasjonal veileder for funksjonskrav i kraftsystemet, accessed 2026-08-09) | ||
Who does Norway (Statnett NVF 2025) bind, and since when?
Type D power park modules, ≥110 kV. No date of effect is published here — grid codes are reissued, so check the current issue before relying on it.
These figures are a reading aid, not legal advice. Grid codes are reissued: verify against the current edition before you design to them.
Curve data last checked against the code on — 66 standards, 130 envelopes, published by bess.engineer under CC BY 4.0.
Questions this page answers about Norway (Statnett NVF 2025)
- Does Norway (Statnett NVF 2025) require ride-through, or only that the plant does not trip?
- Ride-through. Every envelope on this page is a performance duty the plant must meet, not a protection-setting no-trip boundary — they are different obligations. That is what these curves are; they are not everything Norway (Statnett NVF 2025) contains. The requirement sentence under each chart says which side of the curve is the compliant one.
- Are the numbers on this page taken from Norway (Statnett NVF 2025) itself?
- Yes. Every breakpoint is read from the code, and each envelope carries the clause it came from, quoted in full under its chart — so you can check the figure against the standard rather than cite it from this page.
- Which events are charted for Norway (Statnett NVF 2025)?
- Norway (Statnett NVF 2025) is charted here with 2 envelopes — low-voltage ride-through, frequency ride-through (LVRT, FRT). No high-voltage envelope is charted here — check Norway (Statnett NVF 2025) itself before concluding it sets none. Its steady-state voltage-band figure adds one more, drawn from the code's continuous-operating-range table rather than from a ride-through curve.
Ride-through, in context.
An envelope is a compliance boundary; understanding why it exists is a different question. The ride-through and grid-forming entries cover the engineering, and the Engineering Foundations course builds it from the physics up.
Elsewhere in Europe: Austria (E-Control TOR Typ D), Belgium (Federal Grid Code), Denmark (TR 3.3.1), Finland (Fingrid VJV2024), France (RTE), Germany (VDE-AR-N 4120, draft summary), and 13 more