PERFORMANCE RATIO

  • Danilo Diaz
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26 Jan 2023 06:15 #11872 by Danilo Diaz
PERFORMANCE RATIO was created by Danilo Diaz
DEAR ALL:
I am modelling a 15, 30 and 50 MW PV plant connected to the grid with and without VRFB Batteries.
The DC:AC ratio is 1.25 for lat. -13 and Long: -43 with a 5.62 POA.
When I simulate the performance, I found a very low PR like 0.70 - 0.6 without Batteries and even 0.55 - 0.50 with Batteries.The losses are the default for the PV system and 1-3% for the AC side.
Any tips to improve that?
Regards
Danilo 

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  • Paul Gilman
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27 Jan 2023 00:50 #11880 by Paul Gilman
Replied by Paul Gilman on topic PERFORMANCE RATIO
Hi Danilo,

The performance ratio for SAM's Detailed PV model is described here:

samrepo.nrelcloud.org/help/mtp_system_performance_factor.htm

A value of around 0.75 is reasonable for a well-designed system. A PV system with batteries should have a lower performance ratio because of losses associated with the battery.

You may be able to improve the performance ratio by changing the array orientation (tilt and/or azimuth angle), or by reducing losses if appropriate. For example, if the PV array uses DC optimizers, you can set the module mismatch loss to zero.

In your case, the battery roundtrip efficiency reported on the Summary tab for the CASE 3-15 MW-D-conBAT DC case is 45.81, which contributes to the lower performance ratio for the PV-battery system.

Best regards,
Paul.
 

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