Black-Start of a Base Microgrid

Restoring a whole base microgrid from cold requires a deliberate sequence in which the fusion unit is brought up last, after a smaller starting source.

Restoring a dead base

If an installation goes fully dark — grid lost, all generation down — the base must black-start: bring its microgrid back up from nothing. For a fusion-anchored microgrid this is a sequenced operation, because the fusion unit itself needs power to start.

The sequence

• A black-start source (storage or a small generator) energises first.
• The microgrid bus, controls, and protection come alive.
• Fusion auxiliaries — cryogenics, magnet supplies, heating — are powered.
• The fusion unit reaches power and assumes the base load.

Design implications

Because the fusion unit cannot start itself and is not quick to bring to power, the microgrid must include an independent black-start capability sized to energise the fusion plant's auxiliaries. This is a specific, deliberate design requirement, not an assumption. The fusion unit is the anchor for steady-state power and the last element restored during a black-start.

Black-start planning ties together storage, backup generation, and controls into a tested restoration procedure. It is another expression of the layered architecture: fusion provides the enduring power, but simpler sources provide the spark that brings it back after a total loss.

A sequenced, tested procedure

Restoring a dark base is a deliberate sequence: an independent black-start source energises first, then the bus and controls, then the fusion plant's auxiliaries, and finally the machine reaches power and assumes the base load. Because the fusion unit cannot start itself and is slow to bring to power, the black-start source is a specific sized requirement, and the fusion unit is the last element restored.