Benjamin,
Probably you have to be a little careful how you implement the
switch. If you implement a switch that is on a timer so that no
matter what, the inverter sees that there is no power available
from the renewable source at certain times of day then there
should be no reason for there to be convergence problems. However,
if your switch is watching the state of charge of the battery or
something else that might change then the switch needs to have
some hysteresis in it. I don't know what your exact situation is
but pretend that the switch is watching the battery SOC and stops
charging the battery if the battery SOC gets above 0.9. If you
implement this switch with a simple equation then charging will
stop when the SOC gets to 0.9000000000001 and allow charging as
soon as the SOC falls back to 0.9000000000000. You need to use one
of the thermostat controllers to provide a deadband on the SOC so
that charging stops when SOC reaches 0.90 and stops until the
battery falls back to 0.85 (or something)
The inverter/charge controller model isn't all that
complicated. It looks at a load, at the power available from
renewables and at the battery SOC and makes a decision as to how
the power should flow. If you're trying to effectively remove the
battery without deleting it you need to figure out how to make the
inverter/charge controller think that the battery should never be
charged and can never provide power to the load. You might look at
some of the inverter/charge controller parameters that set up when
the battery can and cannot be charged based on its SOC. If you set
those values close to each other and start the battery somewhere
outside that range you may be able to effectively prevent the
battery from having an influence on the system.
kind regards,
David
On 07/15/2016 02:58, Manrique Delgado
Benjamin via TRNSYS-users wrote:
Thanks
for the reply. I have used that strategy successfully with
other Types, but unfortunately the inverter just ignores the
switch. A message in the List file says ”The input to the
listed units have not converged at this timestep. The values
at the last iteration will be used and the simulation will
proceed”.
From: Ben
Heymer [mailto:bheymer@gmail.com]
Sent: Thursday, July 14, 2016 9:43 PM
To: Manrique Delgado Benjamin
<benjamin.manriquedelgado@aalto.fi>; TRNSYS users
mailing list at OneBuilding.org
<trnsys-users@lists.onebuilding.org>
Subject: Re: [TRNSYS-users] Deactivate battery
I'm not familiar with that component
(Type 47a) but its usually possible to use equations to
effectively disconnect the links to and from any Type.
You can zero out inputs to the type
with something like this:
input1 = datapoint1 * switch !
(where "switch" = 1 for "on" or 0 for "off")
You can choose to use outputs from
one type or another type with something like this:
output1 = output1a * switch +
output1b * (1 - switch) ! (where "switch" = 1 for "on"
or 0 for "off")
This will take a bit of time to set up
and it's not very elegant, but the freedom to hack is what
makes TRNSYS great!
On Thu, Jul 14, 2016 at 9:54 AM,
Manrique Delgado Benjamin via TRNSYS-users <trnsys-users@lists.onebuilding.org>
wrote:
Dear
all,
Is
there a way to deactivate a battery (Type 47a)
without having to delete it from a model? I want to
do an optimization that includes options with and
without battery, so I need to find a way to give the
battery zero capacity or stop the inverter from
charging/discharging it. I have tried different
values for High and Low limit on FSOC but the
inverter basically ignores them when the value
doesn’t converge. Any suggestions?
Cheers,
Benjamin
Manrique D.
Aalto
University
Finland
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@lists.onebuilding.org
http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@lists.onebuilding.org
http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
--
***************************
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@tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com