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Performance Ratio error
https://forum.pvsyst.com/viewtopic.php?f=25&t=3478		 Page 1 of 1
Author:  Paulo Oliveira [ Wed May 09, 2018 3:24 pm ]
Post subject:  Performance Ratio error
Hello,

I'm doing a grid-connected project on PVsyst 6.70 and this is the first time that I encounter this error. On the advanced simulation and generating the output file I normally use 5 defined variables: 1- Horizontal global irradiation; 2- ambient temperature; 3- effective Global, corr. for IAM and shadings; 4- Energy injected into grid; 5-Performance Ratio. As mentioned before never had any problems using these parameters on the .CSV file. The problem that I have now is some abnormal values on the PR results, 13 PR values with a -1317.8 which seem not to correct.

see bellow:

PVSYST v6.70
File File date Description
Project Desicor_1.PRJ 07/05/18 12h06 Desicor_1
Geographical Site Brunheiro_PVGIS_SAF_1998 to 2011.SIT 07/05/18 12h06 Brunheiro Portugal Europe
Meteo data Brunheiro_PVGIS_SAF_SYN.MET 08/05/18 09h59 Brunheiro Synthetic
Simulation variant Desicor_1.VC3 07/05/18 13h53 320 kWp
Simulation date 08/05/18 10h00

Simulation: Hourly values from 01/01/90 to 31/12/90

date GlobHor T Amb GlobEff E_Grid PR
27/01/1990 07:00 0.1001 9.1302 0 -0.008 -1317.8
16/02/1990 18:00 0.1001 11.6 0 -0.008 -1317.8
14/03/1990 06:00 0.1001 8.5198 0 -0.008 -1317.8
10/04/1990 19:00 0.1001 21.67 0 -0.008 -1317.8
20/04/1990 05:00 0.1001 7.5902 0 -0.008 -1317.8
21/08/1990 05:00 0.1001 17.95 0 -0.008 -1317.8
01/09/1990 19:00 0.1001 24.2 0 -0.008 -1317.8
20/10/1990 06:00 0.1001 15.67 0 -0.008 -1317.8
27/11/1990 17:00 0.1001 13.39 0 -0.008 -1317.8
28/11/1990 17:00 0.1001 11.37 0 -0.008 -1317.8
12/12/1990 07:00 0.1001 7.8202 0 -0.008 -1317.8
22/12/1990 17:00 0.1001 15.68 0 -0.008 -1317.8
23/12/1990 17:00 0.1001 12.74 0 -0.008 -1317.8


Can you please help me solving this?
Author:  AndrĂ© Mermoud [ Thu Jun 07, 2018 11:18 pm ]
Post subject:  Re: Performance Ratio error
These are marginal points.

All these data are at beginning or end of the day.
For each one you have a null GlobEff, and a negative yield (night loss).
The error of PVsyst is to issue a value for PR in these conditions. We have to check this.
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