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<p>Amir,</p>
<p> The fuel cell model is a little different than most components
in TRNSYS in that you tell it how much current it needs to provide
and it computes the voltage at which the stack has to operate in
order to provide that amount of current. I think the error is
badly worded. It should specify that the power being demanded from
(not generated by) the fuel cell is too great for the fuel cell
(as presently sized) to generate. When you remove the DEGS, the
fuel cell has to provide power if the wind turbine cannot. You may
need to add some controls into the system so that if the needed
current gets too high or if the hydrogen supply gets too low then
the fuel cell stops operating (i.e. isn't asked for power it can't
provide).<br>
</p>
<p>kind regards,</p>
<p> David</p>
<p> <br>
</p>
<div class="moz-cite-prefix">On 02/29/2020 03:36, Amir Hossein
Rahmanzadeh via TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:BN8PR20MB2243C569B2C1996E92490E2DA9E90@BN8PR20MB2243.namprd20.prod.outlook.com">
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<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
Hi everyone</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
I'm trying to simulate a stand alone power system, I went
through the example provided by trnsys itself, there is a Diesel
engine generator system which as far as I get will be used when
the input power is not sufficient to keep the electrolyzer
working ( am I right?) but I don't want it to do such a thing, I
just want to turn off the whole hydrogen system when the power
input is not enough, so I deleted it's component and set the
minimum and maximum number of DEGSs to 0 in type 105 controller,
but after doing that I faced this issue:</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
<br>
</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
"The fuel cell power is too high, add more DEGS or decrease the
FC size."</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
<br>
</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
What I get from this massage is that DEGSs were consuming power
and now when they are gone the power through fuel cell is too
high.</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
<br>
</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
So what's the role of them after all? How can I delete them and
just turn the whole thing off when power is not enough?</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
<br>
</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
Thank you very much for your time and support</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
<br>
</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
Kindest regards</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
<br>
</div>
<div style="color: rgb(33, 33, 33); background-color: rgb(255,
255, 255); text-align: left;" dir="auto">
Rahmanzadeh</div>
<div id="ms-outlook-mobile-signature">
<div><br>
</div>
Mechanical engineering at Iran university of science and
technology<br>
Interested in fields of energy consumption, renewable energies ,
IT & programming.</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
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</blockquote>
<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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