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It still looks mostly like the SA grid was simply sailing a bit too close to the wind between supply and demand.
I am wondering if the frequency mismatch is the reason behind the "Load" change on Heywood. Obviously with a frequency and therefore phase difference between Vic and SA the currents could be immense as a result.
If you replaced 40% supply from wind farms with distributed thermal generation, would SA still have stayed in sync with Vic when 16% of supply suddenly went offline? If the answer is no, what then? It would still likely have tripped the Heywood prot which would still have disconnected 40% to 50% of supply abruptly, hard to see any system holding on in that situation.
Just imagine tripping Loy Yang A and B at the same time, would Vic really stay lit up?
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