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by martinald284 days ago |
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upvoteby caf284 days ago|
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This is potentially the first real black start of a grid with high renewable (solar/wind) penetration that I am aware of.

The South Australia System Black in 2016 would count - SA already had high wind and rooftop solar penetration back then. There's a detailed report here if you're interested:

https://www.aemo.com.au/-/media/Files/Electricity/NEM/Market...

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upvoteby genewitch284 days ago|
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Grid tied solar won't put power into the grid when the grid is down. It's the one reason I didn't grid tie.

Non tied solar won't affect the grid at all. So this is a non-issue.

Grid tie requires the grid to tie to, otherwise it can't synchronize. So it stays disconnected.

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upvoteby sponaugle284 days ago|
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"Grid tied solar won't put power into the grid when the grid is down. It's the one reason I didn't grid tie."

Why would that prevent you from being grid-tie? I have 53 panels (~21kw) grid tied and pushing to the grid, but in the event of grid failure my panels will still operate and push into my 42kwh battery array which will power the entire house. ( The batteries take over as the 'virtual grid source). I can then augment the batteries with generator and run fully off grid for an extended amount of time ( weeks in my case ).

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upvoteby genewitch282 days ago|
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> grid tied

> 42kwh battery array

these are mutually exclusive. What you have is a hybrid system, which is something i explicitly did not mention. A grid-tie system is not generating an AC waveform when the grid is down, at all. it cannot, by definition, and by design, as the AC waveform requires the grid to synchronize to.

Hope this clears this up.

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upvoteby martinald284 days ago|
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Youre missing my point. I know that; I mean if you are restarting the grid and say you have a segment you think has 5MW of load that will come online, but you connect it and a minute or two later suddenly 2MW of grid tied solar detects the grid and starts exporting and you now have 3MW of load it is going to make it much more tricky to balance the restart. I'm not sure how much of a problem this is in reality but it seems to me restarting a grid is made much more tricky when you have millions of generation assets with no control over.
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upvoteby christkv284 days ago|
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This is why most of the restart of the grid is being done as the solar input tappers out I suspect. The grid was pretty much down during peak sun and started coming back online around 5:30 pm or later.
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upvoteby Dylan16807284 days ago|
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> I mean if you are restarting the grid and say you have a segment you think has 5MW of load that will come online, but you connect it and a minute or two later suddenly 2MW of grid tied solar detects the grid and starts exporting and you now have 3MW of load it is going to make it much more tricky to balance the restart.

I really thought that sentence was going to end with "it makes it a lot easier to handle that segment".

Yeah you have some big problems if it's a complete surprise, but your status quo monitoring would have to be very strangely broken for it to be a complete surprise. Instead it should be a mild complicating factor while also being something that reduces your load a lot and lets you get things running quicker.

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upvoteby Tireings284 days ago|
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Those small solar panels probably go directly to the next consumer.

You need to calculate for it but I don't think this would be a problem

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