We noted this morning that ‘Curtailment of rooftop PV underway in South Australia’ using the ‘Distributed PV Contingency’ measures* previously prepared by AEMO.
* In another a later article we’ll endeavour to explain in more detail what this is all about … but for now you might find the article ‘Unlocking a Future with Distributed Solar’ by Mark Thompson and Jenny Riesz at AEMO on the ESIG website of useful background.
Despite these pre-prepared measures, there are questions being asked about whether there’s too much rooftop PV and not enough controllability to cater for situations like this:
(A) SA Power Networks via Facebook
For instance one WattClarity reader has pointed to this update from SA Power Networks this afternoon on Facebook (14:00 SA time, so 13:30 NEM time) in which they are asking residential users to manually switch off their rooftop PV to give them an extra helping hand:
I can’t ever remember hearing a network company putting the call out for people to manually switch off their rooftop PV! That’s a bit of a sign that the situation is pretty serious.
(B) Voltages being raised?
In response to an earlier tweet from me, Mark Jessop has noted that:
‘SAPN appears to be increasing line voltages to cause PV inverters to trip out. Interesting decision, but I’m not sure what other options they would have (probably not enough systems which are remotely controllable yet).’
… here’s the reference: