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shaneyake asked

Microgrid with multiple Nodes

I have been running a Victron Microgrid with Multiple independent systems as a Test for a larger system. Has anyone else done anything similar?

system.png

More Info: https://shaneyake.blogspot.com/2021/09/micro-grid.html

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swebbweb avatar image
swebbweb answered ·

This is very interesting, I've been considering the Idea of running multiple ESS on an islanded microgrid but am unsure how stable it would be. Don't have the means to investing in two more multiplusses and batteries to find out!

I've made a control algorithm to instruct each ESS shown below to help balance the grid and storage.


chargingess1full.png


chargingess1full.png (138.5 KiB)
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shaneyake avatar image shaneyake commented ·
Yeah, it isn't that difficult till the Main system has SOC of 100% and you need to throttle down the export of the other units. That is the hardest part to get stable.
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Mike Dorsett answered ·

The only issue with this type of system is that the grid forming node - the master system MUST have a power equal to that of the permitted reverse power of all the other nodes combined. This is needed to follow Victrons 1:1 rule for ac coupled systems. Given that restraint, there is no reason why this should not be made to work.

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shaneyake avatar image shaneyake commented ·
You actually don't have to follow the 1:1 rule. You just have to be able to handle the peak output for a few seconds till you can ramp down the nodes.


The master node has to be bigger than any of the slave nodes but does not need to be equal to all slave nodes. I have tested this and it is stable.

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swebbweb avatar image swebbweb shaneyake commented ·
This was my understanding as well, In victron literature it justifies the 1:1 rule by looking at changes in load and how the inverter and DC system is required to handle the load during these dynamic changes
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