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Power limitation in both, grid and at inverter level


jonipa
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Hello!

I am currently trying to understand how to manage the case in which there are two power limitations in my PV Plant: Grid and inverter limitation.

PVSyst seems to only allow the limitation either at inverter or at injection point level. At least in the "energy management" section.

Is ther a way to apply both? Maybe applying inverter active power limitation directly on inverter .ond file? What is the right way of doing it?

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Thank you for your feedback!

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Actually PVsyst will apply both by default. The nominal active power limitation by the inverter is automatic.
The question "limitation applied at" "inverter" or "injection point" refers only to the supplementary grid limitation. The difference is whether or not the losses between inverters and injection point should be taken into account to raise the limitation a little bit at the level of inverters.

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Set to both nominal and max. Generally a limitation at the injection point supersedes, or is more common, than a limitation at the inverter. Setting an inverter limit means the inverters are being curtailed, and are being modified by the inverter manufacturer with an adjusted nameplate (they will be providing a letter to certify the new nameplate, etc.). It all depends on your project requirements, what type of installation, grid requirements, etc. 

 

Edited by dtarin
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To do both simultaneously, 1) modify the OND file to the inverter limit, 2) set grid limit to limit at a second value at the injection point, account as a separate loss. You can also do all of this post-PVsyst without modifying the OND file, but you will need to account for the AC losses separately as well. 

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