[clug] Exercise and pay the bills! [SEC=UNCLASSIFIED]
Steven Ring
smr at southsky.com.au
Mon Feb 9 04:02:26 GMT 2009
On Mon, Feb 9, 2009 at 1:39 PM, steve jenkin <sjenkin at canb.auug.org.au> wrote:
> Is there a 'critical mass' of local generation where the inverters don't
> notice the grid has gone down??
I wondered the same thing last year when I did a "fun" unit on Solar
Electricity at ANU (Engineering Department: great course, top people).
Seems to me that if a section of the grid is a nett exporter of energy
at the time it is disconnected from the grid, there would be no
signal to the inverters to turn off. Apparently, the anti-islanding
circuits are suppose to work on a built-in systematic frequency drift
(downwards -- and present in all inverter) to eventually trigger a
shutdown. But I could not find any related manufacturing standards.
The hardware guys will know way more than me on this one.
Steven
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