Research — Illustrative (draft, unvalidated)
DER voltage ride-through — auto
Category III, undervoltage zone UV1 (0.88 p.u.). The ride-through time the unit achieved sweeps up on a log scale from 0.1 s to 25 s, and the verdict flips from non-compliant to compliant exactly at the floor. Category III is shown because its times are the ones the harness corrected after sources disagreed.
Tested ride-through time (log sweep)
0.1 sfloor25 s
Reading —
Voltage (p.u.) vs log time · Category III floor points and the tested ride-through
Ride-through status
Tested
Required
Margin
How the check read it
Client-side port:the logic and table in this page are a TypeScript port of the harness function, checked against values exported from the Python tests. Not a live API call. Domain maturity, quoted from the research page: “Draft, unvalidated. No DER interconnection or protection engineer has reviewed it; every function has only an AI-assisted pre-review. IEEE 1547-2018 is paywalled, so subclause numbers are mostly single-source. The FERC screens are confirmed against authoritative copies.” Category III's minimum ride-through times were corrected after sources disagreed (the harness now uses the MISO / Unitil values; FirstEnergy's posted values are the outlier) and have not been read from a primary copy. IEEE 1547-2018 is paywalled, so the 6.4.2.1 subclause number is single-source and not confirmed against primary text.Real function this maps to:
check_der_voltage_ride_through_zone.Not modeled: only the voltage ride-through floor for this one category and zone, not the harness's other 14 interconnection checks and not the other zones (use the interactive page). Also not modeled: the full ride-through curve (points only), the DER's actual voltage-vs-time response, and which category an authority assigns to a given installation. The sweep order is staged.See also:Ride-through, interactive · Cease-to-energize, auto sweep