PVAPillar 03 · System Security

Probabilistic Voltage Assessment.

How much can the point absorb before voltage collapses?

PV and QV curves, effective short-circuit ratio and reactive support sizing, run automatically for every candidate connection point in the scenario library.

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Why it matters nowLots of inverters on weak parts of the network push voltage towards its limits, which quietly delays or curtails connections. PVA checks the voltage holds and sizes the reactive support that keeps it there.

Example study

The nose curve tells you how much headroom is left.

Voltage against transfer at a candidate point, for a strong grid and a weak one. The nose is the collapse point; the distance to it is the stability margin.

Figures from an example run on a test network.

PV/QVMargin scoring

SCR/MIFGrid strength

Per POIAutomated sweep

MVArSupport siting

PV nose curve · voltage stability margin · candidate POI

What it tells you

A weak connection collapses far earlier. PVA measures the margin and sites the reactive support needed to reach the required transfer.

Across the network

Every node, every hour: violations found, reactive support sized.

A configuration-driven engine that runs DIgSILENT PowerFactory across the full 8,760-hour dispatch. It flags every node outside 0.90 to 1.10 p.u. at 400, 275 and 132 kV, then sizes the reactive support that clears them. Illustrative data.

Violation heat map · 8 760 h · GB transmission · per-node hours outside 0.90 – 1.10 p.u.N-0 baseline · MC-200 · illustrative

Rank	Node	kV	Zone	Type	Hours per year	MVAr
01	Location A	400	Z1	HIGH-V	1,240	250
02	Location B	275	Z1	HIGH-V	1,180	220
03	Location C	400	Z14	LOW-V	980	200
04	Location D	275	Z1	HIGH-V	980	180
05	Location E	400	Z14	LOW-V	860	180
06	Location F	275	Z2	HIGH-V	720	150
07	Location G	400	Z14	LOW-V	720	140
08	Location H	400	Z3	MIXED	680	130
09	Location I	400	Z1	HIGH-V	540	100
10	Location J	400	Z6	LOW-V	520	100
11	Location K	400	Z6	LOW-V	510	110
12	Location L	400	Z6	LOW-V	480	90
13	Location M	400	Z2	MIXED	440	80
14	Location N	275	Z14	LOW-V	420	70
15	Location O	400	Z2	MIXED	420	75

Next step

Try PVA on your own network.

Request a trial contracts@velonenergy.com