Hello everyone,
I have a Microgrid 50Hz AC coupling system consisting of three 3-phase Victron Quattro inverters 10KVA with four MPPTs 250V, a lead-acid battery bank, a servo controller, and a Fronius Eco 27KVA on AC output.
I have some problems with this coupling system:
1- When Fronius exceeds 24KW, it suddenly turns off even though the battery capacity is around 80%. This forces us to turn off some of the solar panel groups so that the inverter can continue to supply the grid with power.
2—The state of the Fronius inverter that appears on the Venus turbo controller is always “Running (Throttled)” or “Error,” whether it is cloudy or sunny or the batteries are full or not, while the correct status is “Running (MPPT)”.
3- The frequency is shifted to 52.8 in sunny weather but the inverter power is not gradually reduced “according to the ramp curve”, and it drops to 50 Hz in cloudy weather but the status in both cases is “Running (Throttled)”.
4- The status at night is always “Error”, while the correct is “Standby”.
If there is an error when it should be off, then there are some settings on the fronius that need attention.
Have you limited battery charging anywhere?
The voltages on your mppts are rather low as well. How are they set up?
I found in DVCC these maximum. Battery charge current is 350A
I noticed that the Fronius Eco27,Kw do not gradually reduce the power even though the frequency gradually increases to 52.8 Hz, and only suddenly cut off the power when its power rises above 23 kW.
So its not responding to frequency shifting correctly. Seems like some settings on the fronius need attention.
Could you please help me to change this settings
What settings have been made on the fronius? Has the firmware been updated?
Its connected to static IP address LAN
and I change some values in Fronius PROFI menu as:
Inner frequency max Limit 52.8Hz
Outer Frequency Max Limit 53Hz
I doubt in AC in setting, I can’t choose AC input1as No LOM detection, because I am asked for a password.
Reset the Fronius to factory defaults and only change the settings for MGxx and the modbus settings.
What assistant are you using for control pv inverter or ess assistant?
These settings are for the victron to accept grid. Not related to the Fronius.
Thank you for your support, I solved the problem and published a post about my system explaining all the steps followed in configuring this system and attached a pdf file for all of that.
Here is the link to the post