Comment Re:EU grid needs inertia or there will be blackout (Score 2) 146
What brought the Iberian electrical grid down wasn't I2R losses but unconstrained variations in frequency. Once the Iberian and French grids got too far out of sync that connection was dropped and failures kind of cascaded from there. Or something to that effect.
Those interconnects are HVDC. There is no "sync".
Frequency change is a symptom, not a cause. The cause was a lack of control over reactive power which then caused voltage instability.
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