Kehul

Grids fail when inverters negotiate.

Ours never have to.

Synchronous Fixed Frequency (SFF) control locks every inverter to one GPS timing pulse. Frequency and phase stop being control problems — leaving a system as simple to run as DC.

 

INVERTER OUTPUT · 3 UNITS · PCC 1PPS GPS
Three inverters inferring frequency from each other — phase drift and beat oscillation 20 ms/div
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0.02 Hz
Frequency shift · 60% load step

50× steadier than the VSG unit on the same test platform.

0.09 s
Voltage recovery

Generating-set standards allow 4–10 s. Sensitive IT loads never notice.

<10 ms
Load & generation transients

Charge-to-discharge swing inside half a cycle. Motors start; nothing moves.

70 ms
Unplanned islanding

Grid lost, supply uninterrupted. Customers stay on before they know it happened.

How it works

Outsource time. Control only current.

Every SFF inverter carries its own precision oscillator, locked to the GPS one-pulse-per-second signal — the same timing backbone that already synchronises protection relays and phasor measurement across national grids.

Placeholder page per the build brief — the mobile product presents differently from the cabinet families.

< 1 µs error

One pulse, everywhere

GPS delivers the identical timing pulse to every unit. Worst-case phase error between any two inverters: 0.018°.

Phase fixed by clock

Every unit already in phase

No unit measures another. No negotiation through the network. Currents from every inverter simply add.

V-I droop

Voltage looks after itself

Each unit meters current against its locally measured voltage — sagging voltage automatically calls up stronger support.

The field record

The problems SFF removes are already on the public record.

~1 Hz

Islanding excursions

A flagship 30 MW VSG microgrid swung 0.9 Hz on planned islanding — and past 51 Hz unplanned, tripping the neighbouring wind farm's protection.

ESCRI-SA DALRYMPLE · ARENA OPERATIONAL REPORTS

18–20 Hz

Inverters fighting inverters

An island grid's battery plants oscillated against each other for a full minute after a generation trip — twice, three years apart.

KAUAʻI 2021 & 2024 · NREL ANALYSES

10 days

Integration effort

A 50 MW grid-forming battery sat ready while engineers spent a week agreeing parameters with a legacy diesel station before it could serve an islanded town.

BROKEN HILL 2024 · TRANSGRID

These systems kept customers supplied — deployed grid-forming hardware is fast and capable. The excursions, oscillations and integration effort are properties of negotiated control architecture. SFF removes the negotiation.

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