[nbf_1995]

The solar wasn't turned off intentionally. The solar turned off automatically due to the over-voltage on the grid.

[toomuchtodo]

There is something called "high voltage ride through," where solar inverters that support it will dynamically adjust to above nominal voltage. If support and coordination are lacking, failure mode is rapid shutdown vs remaining connected.

https://www.iso-ne.com/static-assets/documents/committees/co...

https://www.sciencedirect.com/science/article/abs/pii/S13640...