>> Doesn’t solar have DC to AC converters that maintain a
>> constant desired frequency? And why would one solar
>> installation going down cause the rest of them to not keep
>> producing electricity at the set frequency?
Probably because there is no peak handling demand built into the system. I’m not familiar with solar plants, but something like a large battery bank that could soak up peak demands.
This of course could be impractical or uneconomic.
That’s a load problem not a frequency problem.