Solar Lattice

High-frequency ride-through

ID: func:high-frequency-ride-through
IRI: https://solarlattice.org/kb/func/high-frequency-ride-through
Status: active
Also known as: HFRT, DHFT
Category: Grid support
Function kind: grid-support

High-frequency ride-through keeps a DER connected and in sync with the grid during a temporary over-frequency disturbance, so it does not trip right away. On the Yaskawa SGI XTM, you set up HFRT over Modbus: control, trigger and status bits, an ordered-pair count, and up to 10 frequency and time points that define the must-ride-through curve. When HFRT is enabled on the SGI XTM, it overrides the UL1741/IEEE1547 over-frequency protection setpoints. It can be enabled separately from LFRT. The inverter keeps exporting power while it is inside the time window. It stops producing only if frequency stays past the setpoint for longer than the set time. Above 70 Hz it goes into momentary cessation and risks damage. PPL EU over-frequency settings use OF1 at 61.2 Hz with a 301 s clearing time and OF2 at 62 Hz with a 0.2 s clearing time.

<!-- review notes

sentence 1: support check: partial - Ride-through and maintaining synchronism during over-frequency are stated, but the 'does not trip right away' wording is only implied and the definition is general.
sentence 4: support check: partial - Export during window and cessation only after exceeding time are stated, and cessation and damage warning above 70 Hz are stated, but the damage is 'may result' and the 69.5 Hz D002 threshold differs. -->

Claims

`part_of`

c1 drafted · lead Frequency ride-through

The Yaskawa frequency ride-through function covers both low (LFRT) and high (HFRT) frequency conditions, and each can be enabled on its own.

Modbus Level 9 SGI XTM DOCR-071003-A sec=4.2.9 h=6725a5e5cc15

`trip_threshold`

c2 drafted · lead nominal 61.2 HZ

Conditions: PPL EU required over-frequency setting OF1 (shall trip)

DER Ride Through Settings [code/standard] tbl=5 h=356df394eec9

review note: possible conflict with c4 (same source; check the conditions)

c4 drafted · lead nominal 62 HZ

Conditions: PPL EU required over-frequency setting OF2 (shall trip)

DER Ride Through Settings [code/standard] tbl=5 h=356df394eec9

review note: possible conflict with c2 (same source; check the conditions)

`trip_time`

c3 drafted · lead nominal 301 SEC

Conditions: PPL EU over-frequency setting OF1 clearing time at 61.2 Hz

DER Ride Through Settings [code/standard] tbl=5 h=356df394eec9

review note: possible conflict with c5 (same source; check the conditions)

c5 drafted · lead nominal 0.2 SEC

Conditions: PPL EU over-frequency setting OF2 clearing time at 62 Hz

DER Ride Through Settings [code/standard] tbl=5 h=356df394eec9

review note: possible conflict with c3 (same source; check the conditions)

c7 drafted · lead ≥ 1 SEC

Scope: products Solectria SGI 500/750XTM

Conditions: Minimum time to trip on abnormal frequency, firmware D002

Modbus Level 9 SGI XTM DOCR-071003-A sec=4.2.9 h=6725a5e5cc15

c8 drafted · lead ≥ 0.5 SEC

Scope: products Solectria SGI 500/750XTM

Conditions: Minimum time to trip on abnormal frequency, firmware D003

Modbus Level 9 SGI XTM DOCR-071003-A sec=4.2.9 h=6725a5e5cc15

`setting_range`

c6 drafted · lead ≤ 10 NUM

Scope: products Solectria SGI 500/750XTM

Conditions: Number of [%Frequency, Time] ordered pairs that define the HFRT must-ride-through curve

Modbus Level 9 SGI XTM DOCR-071003-A sec=4.2.9 h=6725a5e5cc15

`response_time`

c9 drafted · lead ≤ 500 MilliSEC

Scope: products Solectria SGI 500/750XTM

Conditions: Recovery after a frequency event when the inverter was not required to trip

Modbus Level 9 SGI XTM DOCR-071003-A sec=4.2.9 h=6725a5e5cc15

c10 drafted · lead ≤ 2 SEC

Scope: products Solectria SGI 500/750XTM

Conditions: Time to reach full output power after momentary cessation, firmware D003

Modbus Level 9 SGI XTM DOCR-071003-A sec=4.2.9 h=6725a5e5cc15

Data