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grp78 avatar image
grp78 asked

Distortion of the input voltage?

Hi all!

There is a three phase system based on quattro 10kva. there are three voltage stabilisers at the inverter input, which force the inverter to switch to battery operation mode very often.

Yellow signal - voltage at the inverter input. The voltage is distorted but not disconnected. This form of voltage causes the inverter to switch to battery operation mode. Is it possible to configure the inverter so that it does not switch to battery operation mode in the event of such a distortion of the input voltage?

When stabilisers are in transit mode everything is ok!

Is there any solution to this problem.

Thanks a lot!

image-2023-11-22-123046.jpg

voltage drop
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4 Answers
grp78 avatar image
grp78 answered ·

Does the inverter have a setting similar to VFRT = Voltage Fault Ride Through Function for dynamic grid backup during grid faults (voltage drops or rises) in the grid in order to prevent an undesirable shutdown of the feed-in power and the collapse of the system?


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Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

What are you current setting for the grid in VE.config?

There are a few options to try. Maybe take a look at this:
https://www.victronenergy.com/live/multiplus_faq

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grp78 avatar image
grp78 answered ·

Dear Matthias, thank you for your reply. The inverter is connected to the mains and we have tried all these settings. Unfortunately the situation is not corrected.

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Alexandra avatar image
Alexandra answered ·

@grp78

We have found voltage stabilizers mess with the Inverters ability to synchronise. Too much shuffling and shifting the inverter will see the 'grid' as unstable and disconnect.

Better to put them on the output to the loads.

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grp78 avatar image grp78 commented ·

Dear Alexandra, thank you for your reply.

This solution can be considered, but there is a nuance. There is a war going on in the country and one of the enemy's tactics is missile attacks on the power grid. By installing stabilisers before the inverter, we are on the one hand trying to protect the more expensive equipment (inverter), on the other hand we are trying to prolong the work of the inverter from the mains during the period when the mains sags.

unfortunately, it's not a standard situation.

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Alexandra avatar image Alexandra ♦ grp78 commented ·

The Inverters would maybe need surge protection, but generally 180v only de rates them. Doesn't cause damage if the rest of the set up is to spec.

You end up with an weird oscillating effect with AVS on the input. It happens with all brands of inverters with transformers in them. (Made worse with the ESS assistant and the grid loss detection)

The other best option is to have them all invert and have robust chargers on the grid for the batteries. If you need the power without the risk and the grid is too unstable. Don't apply conventional means to an unconventional situation.

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grp78 avatar image grp78 Alexandra ♦ commented ·


Dear Alexandra,

Perhaps the best solution is to replace the existing relay type stabilisers with inverter type stabilisers and get away from this problem, but for now we are trying to find a less expensive solution for the client.

I know that this problem occurs when the relay stabiliser switches keys for stabilisation. Perhaps there are some more subtle settings in the Grid (in Quattro) that will help solve this problem?


Anyway, thank you so much for your time on my question. Best regards!

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Alexandra avatar image Alexandra ♦ grp78 commented ·

Not really you would need an inverter that does not synchronise to the grid. Unfortunately that is not a Victron. It builds the sine wave to match, to save itself it is disconnecting.

Tighten the voltage tolerance on the inverters, but remove the AVS. Side effect is though you will invert more.

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