Hi,<div><br></div><div>Carol, I have been simulated a similar system but with lead acid battery, even I did not success to get best results for the battery voltage simulation,</div><div>may be this paper can be an example for you,</div>
<div><br></div><div><a href="http://www.umc.edu.dz/vf/proceeding/efeea-2010/Topic_1/SCE28.pdf">http://www.umc.edu.dz/vf/proceeding/efeea-2010/Topic_1/SCE28.pdf</a></div><div><br></div><div>I've got some problem with the simulation,</div>
<div>1. I simulate the system for a year. I found that in the first week of simulation the battery SOC keeps decreasing until reach minimum SOC, even though I change the PV panel capacity a lot bigger so the Input energy will be more than load. I wonder why this thing happened.</div>
<div><br></div><div>2. In the controller, for my case I choose 47b, I set AC to DC efficiency to 0, to eliminate charging from the grid, Is it the right approach? or are there any other way to eliminate charging from the grid? because I want the system to be a stand alone system.</div>
<div><br></div><div>Thank you for share </div><div><br></div><div><a href="http://www.umc.edu.dz/vf/proceeding/efeea-2010/Topic_1/SCE28.pdf"></a>Regards,</div><div><br></div><div>Dimas<br><br><div class="gmail_quote">On Sat, Feb 26, 2011 at 2:20 AM, David BRADLEY <span dir="ltr"><<a href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div text="#000000" bgcolor="#ffffff">
Carol,<br>
Yes, that would be the correct approach. The inverter that is
built in to Type194 takes the DC power directly from the array and
converts it to AC. You would want a charge controller (regulator)
that charged the battery with DC power and only after that converted
to AC power with an inverter.<br>
Best,<br>
David<div><div></div><div class="h5"><br>
<br>
<br>
On 2/24/2011 09:28, Pascual, Carol wrote:
</div></div><blockquote type="cite"><div><div></div><div class="h5">
<div>
<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)">Hello,</span></p>
<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)"> </span></p>
<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)" lang="EN-US">I would like to simulate a PV system
with energy storage and I think
that I can´t use the type 194b PV-Inverter. I have to use
the type 194 then a
regulator-inverter (type 48d) and finally the battery (type
47c). Am I right?</span></p>
<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)" lang="EN-US">Thanks in advance,</span></p>
<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)" lang="EN-US">Carol</span></p>
<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size:11pt;color:rgb(31, 73, 125)" lang="EN-US"> </span></p>
<div>
<div style="border-right:medium none;border-width:1pt medium medium;border-style:solid none none;border-color:rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color;padding:3pt 0cm 0cm">
<p class="MsoNormal"><b><span style="font-size:10pt;color:windowtext" lang="EN-US">De:</span></b><span style="font-size:10pt;color:windowtext" lang="EN-US">
David Bradley [<a href="mailto:bradley@tess-inc.com" target="_blank">mailto:bradley@tess-inc.com</a>] <br>
<b>Enviado el:</b> 12 March 2010 18:51<br>
<b>Para:</b> Dimas Firmanda Al Riza<br>
<b>C</b></span><b><span style="font-size:10pt;color:windowtext">C:</span></b><span style="font-size:10pt;color:windowtext"> Maria Victoria Cambronero Vazquez;
<a href="mailto:trnsys-users@cae.wisc.edu" target="_blank">trnsys-users@cae.wisc.edu</a><br>
<b>Asunto:</b> Re: [TRNSYS-users] batteries models</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Dimas,<br>
I am not sure that changing the cell voltage is valid. I
think that the
Shepherd model assumes a certain shape to the battery's charge
/ discharge
curve that is inherent to lead acid batteries and not as valid
to other battery
types. Someone please correct me if I am wrong about that.<br>
Best,<br>
David<br>
<br>
<br>
Dimas Firmanda Al Riza wrote: </p>
<p class="MsoNormal" style="margin-bottom:12pt">Dear David and
Maria,<br>
<br>
I'm also doing simulation that required different type of
battery from the
existing battery type available in TRNSYS library,<br>
I need to simulate 12V battery bank, that consist of 4 @12V
100Ah battery. Type
47b in TRNSYS library have a default voltage value of 2,5V
each cell, Can I
simply change this value? or do I need to make some other
modification for this
component? <br>
David, I'd like to read the paper you've offered to maria,
would you send me
also?<br>
<br>
Thank you very much<br>
<br>
-dimas-<br>
ME Student<br>
UTP</p>
<div>
<p class="MsoNormal">On Sat, Mar 13, 2010 at 12:18 AM, David
Bradley <<a href="mailto:bradley@tess-inc.com" target="_blank">bradley@tess-inc.com</a>>
wrote:</p>
<div>
<p class="MsoNormal">Maria,<br>
You are correct that the battery models in TRNSYS are
for lead-acid
cells. I was directed to a paper some years ago that
suggested a method for
modeling lithium-ion batteries. The method comes down to
curve fitting the data
that you get from a manufacturer's catalog into a few
polynomials. I had a hard
time following the some parts of the paper and never got a
chance to implement
the model but it seemed to me as though the method could
be extended to other
battery types. I'll forward you the paper in a separate
email. If anyone else
has seen some modeling research in this area, I'd be quite
interested in
hearing about it to improve on the existing battery
models.<br>
Best,<br>
David </p>
<div>
<div>
<p class="MsoNormal"><br>
<br>
<br>
Maria Victoria Cambronero Vazquez wrote: </p>
</div>
</div>
<blockquote style="margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<p class="MsoNormal"><span style="font-size:10pt">Hi,</span></p>
<p class="MsoNormal"><span style="font-size:10pt"> </span></p>
<p class="MsoNormal"><span style="font-size:10pt" lang="EN-GB">I´d need
to know if there is a model of Li-Ion Battery or
if I´m able to characterize
any kind of battery using an existing type (in
spite of being lead-acid
battery).</span></p>
<p class="MsoNormal"><span style="font-size:10pt" lang="EN-GB">Thank you
very much!</span></p>
<p class="MsoNormal"><span style="font-size:10pt" lang="EN-GB">Maria</span></p>
</div>
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