[TRNSYS-users] batteries models
Dimas Firmanda Al Riza
dimasfirmanda at gmail.com
Sat Feb 26 09:41:03 PST 2011
Hi,
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,
may be this paper can be an example for you,
http://www.umc.edu.dz/vf/proceeding/efeea-2010/Topic_1/SCE28.pdf
I've got some problem with the simulation,
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.
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.
Thank you for share
<http://www.umc.edu.dz/vf/proceeding/efeea-2010/Topic_1/SCE28.pdf>Regards,
Dimas
On Sat, Feb 26, 2011 at 2:20 AM, David BRADLEY <d.bradley at tess-inc.com>wrote:
> Carol,
> 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.
> Best,
> David
>
>
>
> On 2/24/2011 09:28, Pascual, Carol wrote:
>
> Hello,
>
>
>
> 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?
>
>
>
> Thanks in advance,
>
> Carol
>
>
>
>
>
> *De:* David Bradley [mailto:bradley at tess-inc.com <bradley at tess-inc.com>]
> *Enviado el:* 12 March 2010 18:51
> *Para:* Dimas Firmanda Al Riza
> *C**C:* Maria Victoria Cambronero Vazquez; trnsys-users at cae.wisc.edu
> *Asunto:* Re: [TRNSYS-users] batteries models
>
>
>
> Dimas,
> 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.
> Best,
> David
>
>
> Dimas Firmanda Al Riza wrote:
>
> Dear David and Maria,
>
> I'm also doing simulation that required different type of battery from the
> existing battery type available in TRNSYS library,
> 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?
> David, I'd like to read the paper you've offered to maria, would you send
> me also?
>
> Thank you very much
>
> -dimas-
> ME Student
> UTP
>
> On Sat, Mar 13, 2010 at 12:18 AM, David Bradley <bradley at tess-inc.com>
> wrote:
>
> Maria,
> 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.
> Best,
> David
>
>
>
>
> Maria Victoria Cambronero Vazquez wrote:
>
> Hi,
>
>
>
> 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).
>
> Thank you very much!
>
> Maria
>
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