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After shedding mains frequency out of range


Elbow

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After the load shedding I see that my inverter doesn't want to tie back to the grid.  I presume it's because the mains frequency is low and @Rautenk had me set it to the required, fussy, standard ;-)

Screenshot_20191205-202800_Photos.thumb.jpg.741fcad2fd76f465b8d580e161e85e29.jpg

 

Hoping it will come right eventually since my batteries are not that big. 

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Hi @Gerlach,

In normal conditions it does stay tied.  I do see low grid voltage - sometimes as low at 197v under high load.  Council insists there is no fault but i presume in fact the distribution wiring resistance (impendance) is too high.  I've accepted that they aren't going to fix it.  Frequency does dip too but I think the inverter rules to stay tied or to re-tie are not quite the same so its a bit more tolerant once tied then when it is isolated and is trying to re-tie.

 

 

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13 minutes ago, Elbow said:

Frequency does dip too but I think the inverter rules to stay tied or to re-tie are not quite the same so its a bit more tolerant once tied then when it is isolated and is trying to re-tie.

I actually read NRS097 this morning to see if I can see numbers. It says anything between 47Hz and 52Hz can be tied with (with power throttling as you go higher), and it says frequency and voltage must remain within limits for 60 seconds before you can tie with it... BUT... it does not seem to indicate whether the limits are narrower (or not) for reconnection than for running.

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On 2019/12/06 at 11:45 AM, plonkster said:

I actually read NRS097 this morning to see if I can see numbers. It says anything between 47Hz and 52Hz can be tied with (with power throttling as you go higher), and it says frequency and voltage must remain within limits for 60 seconds before you can tie with it... BUT... it does not seem to indicate whether the limits are narrower (or not) for reconnection than for running.

Ah, interesting. Maybe it was the voltage that was low - my Openenergymonitor box wasn't working so I don't have the data. 

 

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