[Scilab-users] Modelling dynamic systems with real world data

[Dirk Reusch]

Hello,

This Modelica library might be inspiring:
 
https://github.com/modelica/ElectricalEnergyStorage

Regards,

Dirk

On Thu, 13 Apr 2017 16:15:01 +0000
Michael J McCann <mjmccann at ieee.org> wrote:

> Hmm... batteries: Charge storage devices which have a largely
> constant voltage in the working range but which show big changes in
> apparent voltage when they reach full charge and when the charge
> drops very low. You don't get all the electrons back. I suspect a
> really good model would relate these effects to the electrochemical
> processes at work. Also because they are "batteries" and not
> individual cells,  the aggregate behaviour will depend on the whole
> (in series) set. With a sort of diodes and resistors model for the
> charge and discharge routes (somewhat different characteristics), it
> is possible to make a fair model for a battery's functional
> operations but I'd be a bit concerned if it was to try to make
> predictions of behaviour under stress  (e.g.very high discharge
> rates) or temperature changes (which in lead acid batteries reduce
> apparent capacity and ability to deliver current). There's an
> industry emerging for batteries with all the associated support
> equipment for creating backups for solar power etc. So it becomes a
> question of how deep you want to go into the physics.
> 
> Mike.
> 
> =====================
> On 12/04/2017 16:02, tim at wescottdesign.com wrote:
> >
> > I strongly suspect that anything that would be useful would be 
> > specific to batteries, and would perhaps be best done in batch mode
> > to generate a model that is then hand-tweaked and selected for use
> > in xcos -- but I say that in part because over the years I've come
> > to dislike graphical solvers.
> >
> > I think it's possible to build a subsystem out of blocks that can
> > be "masked" so that you can enter parameters in the usual way -- if
> > you could boil your battery model down so that it had a few
> > parameters, you could translate your measured data into parameters
> > once, then use parameterized blocks for the battery behavior.
> >
> > On 2017-04-12 07:49, phillip mobley wrote:
> >
> >> Sure thing Tim,
> >> Thank you for pointing out those details. I will share as much as
> >> I can. I am simulating the behavior of a battery as it is
> >> discharging into a circuit. I recorded data from the battery (for
> >> example, the voltage and current and internal resistance) during
> >> testing. I currently have the data at different time steps inside
> >> of an excel file. I would like to test this battery under
> >> different circuit configurations. However, changing the circuit
> >> can be time consuming and expensive. I was thinking that I could
> >> use xcos ability to do circuit simulation to construct a basic
> >> model of the battery that I am using that utilizes the data that I
> >> gathered. This way I can simulation the battery under different
> >> circuit configurations very easily.
> >> So I was wondering if there was a way that I could import my data 
> >> into xcos to construct a model for simulation.
> >> I actually created the system to simulate the battery.
> >>
> >> On Tue, Apr 11, 2017 at 3:48 PM, Tim Wescott
> >> <tim at wescottdesign.com <mailto:tim at wescottdesign.com>> wrote:
> >>
> >>     "Simulate the data"?
> >>
> >>     Surely you mean you wish to simulate the system which was used
> >> in the measurement!
> >>
> >>     You don't give much detail, but I suspect that what you want
> >> to do is to develop a model of the system that fits the
> >> experiment, and then use
> >>     that model in your simulations.
> >>
> >>     The general term for generating the model is called "system
> >>     identification", but that covers a pretty broad swath.
> >>
> >>     Can you share the test you did, the sort of data you
> >> collected, the sort of system you're trying to model, and how well
> >> you know the system
> >>     itself?
> >>
> >>     On Tue, 2017-04-11 at 15:10 -0400, phillip mobley wrote:
> >>     > Hello all,
> >>     >
> >>     > I have some data from a test that I preformed. I was looking
> >>     > to simulate this data under different conditions and I was
> >>     wondering if
> >>     > there is a palette in xcos that would allow me to input data
> >>     > (maybe from an excel spreadsheet or copy paste) in order to
> >>     > use in the simulation?
> >>     >
> >>     > Is this possible with xcos?
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> >>     --
> >>
> >>     Tim Wescott
> >>     www.wescottdesign.com <http://www.wescottdesign.com>
> >>     Control & Communications systems, circuit & software design.
> >>     Phone: 503.631.7815 <tel:503.631.7815>
> >>     Cell: 503.349.8432 <tel:503.349.8432>
> >>
> >>
> >>
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> >
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