Electronics > Power/Renewable Energy/EV's

How does grid tied solar “know” when the grid is down?

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DougSpindler:
Trying to learn/understand how grid tied solar knows when the grid is down.  Looking for a simple technical explanation. 
I was told a contactor’s coil it attached to the grid.  When no power is senesced on the grid, the contactor contacts open isolating the solar panels from the grid.  But if the panels are feeding electricity to the grid how does the contactor’s coil know if the electrons are coming from the grid or solar panels. 

Thanks

trobbins:
One method is to stop the PV inverter for a short duration, and sense what the grid does during that short time.  That works well for a stiff grid but has caused some grief for SMA users on weak grids or where other grid connected inverters don't like such  'glitchs'.

NiHaoMike:
A negative impedance is inherently unstable, pair that with voltage/frequency limits and it simply won't stay in bounds for more than a split second without a voltage source keeping it in check.

Faringdon:
...though all the many 100's of solar inverters pumping power into the grid would keep the grid up anyway?

trobbins:

--- Quote from: Faringdon on September 03, 2023, 09:45:30 am ---...though all the many 100's of solar inverters pumping power into the grid would keep the grid up anyway?
--- End quote ---
Perhaps best not to hijack the thread.

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