Solar Lattice

Function

Low-voltage ride-through

ID
func:low-voltage-ride-through
IRI
https://solarlattice.org/kb/func/low-voltage-ride-through
Status
active
Also known as
LVRT, DLVT
Category
Grid support
Function kind
grid-support

Low-voltage ride-through keeps the inverter online and supplying output current when grid voltage briefly drops below a preset low threshold, so it does not disconnect. After the voltage dip, the inverter changes its reactive current reference according to the country-specific grid code. Utilities publish their own settings. For example, PPL EU sets its low-voltage shall ride-through and shall trip curves to be identical, with points UV1 and UV2.

Claims

part_of

c1 drafted · lead Voltage ride-through

LVRT is the low-voltage side of voltage ride-through; HVRT is the high-voltage side.

trip_threshold

c2 verified · fact nominal 0.88 UNITLESS

Scope: regions Pennsylvania proposed; valid from 2023-11-30

Conditions: PPL EU UV1 shall-trip setting, per unit of nominal voltage; shall ride-through and shall trip curves overlap

verified by: review-workflowverified on: 2026-10-24review note: support check: partial - UV1 0.88 p.u. with overlapping curves is stated, but the region (PA) and effective date 11/30/2023 are only partly evidenced (PPL EU, rev 04 effective 11/30/2023; PA not stated).; possible conflict with c4 (same source; check the conditions)

c4 drafted · lead nominal 0.5 UNITLESS

Scope: regions Pennsylvania proposed; valid from 2023-11-30

Conditions: PPL EU UV2 shall-trip setting, per unit of nominal voltage

review note: support check: partial - UV2 0.5 p.u. is in the table; the Pennsylvania region is not stated.; possible conflict with c2 (same source; check the conditions)

trip_time

c3 drafted · lead nominal 2.1 SEC

Scope: regions Pennsylvania proposed; valid from 2023-11-30

Conditions: PPL EU UV1 shall-trip time at 0.88 p.u.

review note: support check: partial - UV1 time 2.1 s at 0.88 p.u. is in the table; the Pennsylvania scope is not stated, though the effective date matches.; possible conflict with c5 (same source; check the conditions)

c5 drafted · lead nominal 0.6 SEC

Scope: regions Pennsylvania proposed; valid from 2023-11-30

Conditions: PPL EU UV2 shall-trip time at 0.5 p.u.

review note: support check: partial - UV2 time 0.6 s at 0.5 p.u. is in the table; the Pennsylvania region is not stated.; possible conflict with c3 (same source; check the conditions)

setting_range

c6 drafted · lead 0–100 PERCENT

Scope: products CPS SCA36KTL-DO/US-480, CPS SCA50-60KTL-DO/US-480

Conditions: LVRTVolt threshold points 1 to 8, IEEE 1547-2018, Rule 21 and ISO-NE settings

review note: support check: partial - The table gives 0-100 % for LVRTVolt in all three settings, but the passages do not name the Chint products.

c7 drafted · lead 0–655 SEC

Scope: products CPS SCA36KTL-DO/US-480, CPS SCA50-60KTL-DO/US-480

Conditions: LVRTTime points 1 to 8, IEEE 1547-2018, Rule 21 and ISO-NE settings

review note: support check: partial - The table gives 0-655 s for LVRTTime, but the passages do not name the Chint products.

default_value

c8 drafted · lead nominal 50 PERCENT

Scope: products CPS SCA36KTL-DO/US-480, CPS SCA50-60KTL-DO/US-480

Conditions: LVRTVolt points 3 and 4, IEEE 1547-2018 and Rule 21 settings

review note: support check: partial - Default 50 % for LVRTVolt (3,4) under IEEE1547-2018 and Rule21 is in the table; the products are not named.; possible conflict with c9 (same source; check the conditions); possible conflict with c10 (same source; check the conditions)

c9 drafted · lead nominal 70 PERCENT

Scope: products CPS SCA36KTL-DO/US-480, CPS SCA50-60KTL-DO/US-480

Conditions: LVRTVolt points 5 and 6, IEEE 1547-2018 and Rule 21 settings

review note: support check: partial - Default 70 % for LVRTVolt (5,6) under IEEE1547-2018 and Rule21 is in the table; the products are not named.; possible conflict with c8 (same source; check the conditions); possible conflict with c10 (same source; check the conditions)

c10 verified · fact nominal 88 PERCENT

Scope: products CPS SCA36KTL-DO/US-480, CPS SCA50-60KTL-DO/US-480

Conditions: LVRTVolt points 7 and 8, IEEE 1547-2018 and Rule 21 settings; also point 8 under ISO-NE

verified by: review-workflowverified on: 2026-10-24review note: support check: partial - Default 88 % for LVRTVolt (7,8) under IEEE1547-2018 and Rule21, and 88 for ISO-NE point 8, are in the table; the products are not named.; possible conflict with c8 (same source; check the conditions); possible conflict with c9 (same source; check the conditions)

c11 verified · fact nominal 20 SEC

Scope: products CPS SCA36KTL-DO/US-480, CPS SCA50-60KTL-DO/US-480; standard IEEE 1547-2018 proposed

Conditions: LVRTTime points 7 and 8, IEEE 1547-2018 setting

verified by: review-workflowverified on: 2026-10-24review note: support check: partial - IEEE1547-2018 default of 20 s for LVRTTime (7,8) is in the table; the products are not named.

c12 drafted · lead nominal 20.5 SEC

Scope: products CPS SCA36KTL-DO/US-480, CPS SCA50-60KTL-DO/US-480; standard CA Rule 21 proposed

Conditions: LVRTTime points 7 and 8, Rule 21 setting

review note: support check: partial - Rule21 default of 20.5 s for LVRTTime (7,8) is in the table; the products are not named.

c13 drafted · lead nominal 3.05 SEC

Scope: products CPS SCA36KTL-DO/US-480, CPS SCA50-60KTL-DO/US-480; regions ISO New England market area proposed

Conditions: LVRTTime point 7, ISO-NE setting

review note: support check: partial - ISO-NE default of 3.05 s for point 7 is in the table; the products are not named.; possible conflict with c14 (same source; check the conditions)

c14 verified · fact nominal 3.25 SEC

Scope: products CPS SCA36KTL-DO/US-480, CPS SCA50-60KTL-DO/US-480; regions ISO New England market area proposed

Conditions: LVRTTime point 8, ISO-NE setting

verified by: review-workflowverified on: 2026-10-24review note: support check: partial - ISO-NE default of 3.25 s for point 8 is in the table; the products are not named.; possible conflict with c13 (same source; check the conditions)

Referenced by

Data