[TRNSYS-users] TRNSYS-users Digest, Vol 157, Issue 7

David BRADLEY d.bradley at tess-inc.com
Tue Jan 9 08:59:15 PST 2018


Amit,

   I am not clear as to whether you are asking for an explanation of the 
equation V = max(0,time-10) or whether you are asking about the format 
of the characteristic of a photovoltaic's I-V curve.

  If it is the first case then the max(:,:) function returns the maximum 
of two arguments. TIME is a built-in variable. The equation sets a 
variable (V) to the maximum of zero or the present simulation time minus 
10.

  If you want to know about the characteristic curve of a PV I would 
recommend reading the 04-MathematicalReference manual section about the 
PV Type that you are using.

kind regards,

  David



On 01/09/2018 07:23, Amit Verma via TRNSYS-users wrote:
> Hello Everyone !!!
>
> Can anyone describe how to write Eqn  for I-V Curve in Photovoltaic 
> i.e V=max (0,time-10)
>
> Regards
> Amit Verma
>
> On Tue, Jan 9, 2018 at 2:03 PM, 
> <trnsys-users-request at lists.onebuilding.org 
> <mailto:trnsys-users-request at lists.onebuilding.org>> wrote:
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>        1. Re: curve of WTG (MACIAS VICENTE, SERGIO)
>
>
>     ---------- Forwarded message ----------
>     From: "MACIAS VICENTE, SERGIO" <SMACIAS at external.gamesacorp.com
>     <mailto:SMACIAS at external.gamesacorp.com>>
>     To: "'David BRADLEY'" <d.bradley at tess-inc.com
>     <mailto:d.bradley at tess-inc.com>>, "TRNSYS users mailing list at
>     OneBuilding.org" <trnsys-users at lists.onebuilding.org
>     <mailto:trnsys-users at lists.onebuilding.org>>
>     Cc:
>     Bcc:
>     Date: Tue, 9 Jan 2018 08:33:50 +0000
>     Subject: Re: [TRNSYS-users] curve of WTG
>
>     Hello,
>
>     Thank you very much. The fault was that.
>
>     Best regards.
>
>     *Sergio Macías Vicente*
>
>     Offgrid Technical
>
>     Siemens Gamesa Offgrid
>
>     Descripción: Descripción: cid:image001.png at 01D2AD3E.E2146250
>
>     *Gamesa Corporación Tecnológica*
>
>     *De:*David BRADLEY [mailto:d.bradley at tess-inc.com
>     <mailto:d.bradley at tess-inc.com>]
>     *Enviado el:* viernes, 22 de diciembre de 2017 18:55
>     *Para:* MACIAS VICENTE, SERGIO; TRNSYS users mailing list at
>     OneBuilding.org
>     *Asunto:* Re: [TRNSYS-users] curve of WTG
>
>     Sergio,
>
>      I suggested the distributor route because this forum is
>     (supposedly) for users to help users whereas the distributors are
>     (hopefully) more likely to respond to tech support questions like
>     yours.
>
>     I did look at the project you sent. The wind turbine is internally
>     controlled so that if the wind speed exceeds the rated wind speed
>     (specified in the data file) the rotors change pitch to shed wind
>     so that the turbine is not damaged. When the incident wind speed
>     exceeds rated wind speed the turbine will produce its rated power.
>
>     kind regards,
>
>      David
>
>     On 12/20/2017 01:50, MACIAS VICENTE, SERGIO wrote:
>
>         Hello,
>
>         I attach all the files. Surely someone can help me. It is a
>         simple example to verify that the behavior of the wind turbine
>         is correct.
>
>         Thank you.
>
>         Best regards.
>
>         *Sergio Macías Vicente*
>
>         Offgrid Technical
>
>         Siemens Gamesa Offgrid
>
>         Descripción: Descripción: cid:image001.png at 01D2AD3E.E2146250
>
>         *Gamesa Corporación Tecnológica*
>
>         *De:*David BRADLEY [mailto:d.bradley at tess-inc.com]
>         *Enviado el:* martes, 19 de diciembre de 2017 21:19
>         *Para:* TRNSYS users mailing list at OneBuilding.org
>         *CC:* MACIAS VICENTE, SERGIO
>         *Asunto:* Re: [TRNSYS-users] curve of WTG
>
>         Sergio,
>
>          I would recommend that you send your project to your
>         distributor so that they can determine why the turbine is
>         giving less power than expected.
>
>          The distributor will need to have your project (*.tpf file)
>         and the wind turbine data file that you are using as well as
>         any other files needed in order to run the simulation.
>
>         kind regards,
>
>          David
>
>         On 12/19/2017 09:47, MACIAS VICENTE, SERGIO via TRNSYS-users
>         wrote:
>
>             Hello, my name is Sergio.
>
>             I have a question. I have the curve of a wind turbine as
>             in the image. The behavior is not correct, since at 25 m /
>             s they produce 95 kW. Can you insert a curve in the next way?
>
>             Thanks.
>
>             Best regards.
>
>             *Sergio Macías Vicente*
>
>             Offgrid Technical
>
>             Siemens Gamesa Offgrid
>
>             Descripción: Descripción: cid:image001.png at 01D2AD3E.E2146250
>
>             *Gamesa Corporación Tecnológica*
>
>             **
>
>             Crta. Pozaldez km.1
>
>             47400 Medina del Campo
>
>             Spain
>
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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
>
>
>
>     -- 
>
>     ***************************
>
>     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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