PVAPillar 03 · System Security

Probabilistic Voltage Assessment.

How much can the point absorb before voltage collapses?

PV/QV-based voltage-stability margin, effective short-circuit ratio and reactive-support siting — evaluated automatically across every candidate point of interconnection in the scenario library.

PV / QV curvesVoltage-stability marginEffective SCR / MIFReactive-support siting

PV/QVMargin scoring

SCR/MIFGrid strength

Per POIAutomated sweep

MVArSupport siting

The signature output

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.

PV nose curve · voltage stability margin · candidate POI

A weak grid collapses far earlier. PVA prices the reactive support — and sites it — needed to push the nose out to the required transfer.

The full picture

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

A configuration-driven engine that orchestrates DIgSILENT PowerFactory across the full 8 760-hour dispatch — flags every node breaching 0.90 / 1.10 p.u. at 400, 275 and 132 kV, then sizes the reactive support portfolio 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

	Node	kV	Zone	Type		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

Inside the engine

Voltage security, POI by POI.

PV / QV curves

Swept automatically at every candidate POI to find the voltage-collapse point.

Margin scoring

Distance to the nose scored as the voltage-stability margin under each scenario.

Effective SCR

Short-circuit ratio and mode-interaction factor quantify grid strength at the connection.

Reactive siting

Recommends where and how much dynamic or static reactive support is required.

The read

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