[TRNSYS-users] Question related to the inverter of type 194

[David BRADLEY]

Sotiris,
   When you choose a PV from the list, all of the fields should still 
show "?????" until you click on the "calculate" button in the 
"calculations" section of the plugin. When you manually enter 
parameters, the same is true; the fields at the bottom for the 5 
reference parameters should all show "?????" until you choose 
"calculate". The plugin transfers the computed results back to the 
proforma if it was able to obtain a good solution once you select "Exit" 
from the File menu. If the plugin did not solve to within tolerances, it 
will show you its best guess of the answers but it will not transfer the 
values back to the plugin automatically. You can transfer them manually 
if you need to.

   If you are having trouble with a particular PV module, please send me 
the input data. I may be able to generate the parameters for you using a 
different tool.
Best,
  David


On 7/22/2013 03:48, Sotiris Papantoniou wrote:
>
> Dear David and all Trnsys users,
>
> The thank you for the information for the inverter, I have managed to 
> find the data for the data file. Coming back to the trnsys plug-in of 
> type 194, the plug-in seems to work in a mysterious way.
>
> If I select a specific photovoltaic type from the list no data are 
> available.
>
> If I add manually some data on the plug-in, the 5 parameters are 
> identical to example.var's parameters.
>
> Is there something missing from my plug-in? Am I doing something wrong?
>
> Thank you
>
> Sotiris
>
> *From:*David BRADLEY [mailto:d.bradley at tess-inc.com]
> *Sent:* Thursday, July 18, 2013 7:57 PM
> *To:* TRNSYS users mailing list at the Solar Energy Lab, UW-Madison
> *Cc:* Sotiris Papantoniou
> *Subject:* Re: [TRNSYS-users] Question related to the inverter of type 194
>
> Sotiris,
>   The file contains the inverter efficiency as a function of the input 
> power (in watts) and the input voltage (in volts). These values are 
> typically published by manufacturers on the inverter specification 
> sheets. If you do not have such a sheet then you can use the example 
> data file and scale the input voltage and power to the range of input 
> voltage and power that you need. Inverters tend to be quite efficient 
> (around 95%) except when the input power is below about 5 to 10% of 
> the rated input power at which point their efficiency drops quite a lot.
> Kind regards,
>  David
>
> On 7/18/2013 02:28, Sotiris Papantoniou wrote:
>
>     Hello Trnsys users,
>
>     I am trying to model a pv-system with inverter. I have managed to
>     model the photovoltaic modules using the plug-in, but now I have
>     to model the inverter of the system. The characteristics of the
>     inverter are partly set in the parameters of the type and the
>     external file inserted by the user. Where can I find the
>     information which are related to this file.
>
>     Thank you
>
>     Sotiris
>
>
>
>
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>
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>
>
>
> -- 
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI  53703 USA
>   
> P:+1.608.274.2577
> F:+1.608.278.1475
> d.bradley at tess-inc.com  <mailto:d.bradley at tess-inc.com>
>   
> http://www.tess-inc.com
> http://www.trnsys.com
>
>
> _______________________________________________
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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