Re: Problem with OpenModelica simulation

Thu, 11 Dec 2008 20:00:13 -0800 


Hi,

There is a new nightly-build available here:
http://www.ida.liu.se/~pelab/modelica/OpenModelica/OMC/nightly-builds/
which should (hopefully :) deal with your problem.

Cheers,
Adrian Pop/

Pranesh Rao wrote:

I found the problem in my simulation. I had to add a small capacitor
between the anode of diode D6 and ground g. The model works in Dymola
but still not in OpenModelica because of the data structure problem
that Adrian pointed out.

Thanks.

Pranesh

-----Original Message----- From:
[email protected]
[mailto:[email protected]] On Behalf Of Pranesh
Rao Sent: Tuesday, December 09, 2008 8:09 AM To:
[email protected] Subject: RE: Problem with
OpenModelica simulation

Adrian,

Thank you for your help. I will look at the model and see what I am
missing - perhaps a decoupling capacitor or something.

Again, thanks.

Pranesh Rao

-----Original Message----- From:
[email protected]
[mailto:[email protected]] On Behalf Of Adrian
Pop Sent: Tuesday, December 09, 2008 5:12 AM To:
[email protected] Subject: Re: Problem with
OpenModelica simulation


Hi,

Some of the fixed data structures inside the simulation runtime need
to be increased. They should actually be dynamic, but that's another
story. I'll generate a new nightly-build in a couple of days and let
you know when is available.
The generated system of equations seems to be singular so you might also need to do some changes in your model. Maybe some other people on the list can help you with that. 

Cheers, Adrian Pop/

Pranesh Rao wrote:

Hi,



I am trying to simulate the following model using OpenModelica
1.4.4 and the Modelica 3.0 library:
model br3ph1 "three phase diode bridge feeding R-L load (source inductance present)" 

constant Real PI = Modelica.Constants.pi;
Modelica.Electrical.Analog.Sources.SineVoltage src_a(V=120.0,phase=0,freqHz=60.0);
Modelica.Electrical.Analog.Sources.SineVoltage src_b(V=120.0,phase=-2*PI/3,freqHz=60.0);
Modelica.Electrical.Analog.Sources.SineVoltage src_c(V=120.0,phase=2*PI/3,freqHz=60.0); 

Modelica.Electrical.Analog.Basic.Resistor rs[3](each R=0.1) "source
 resistance";

Modelica.Electrical.Analog.Basic.Inductor ls[3](each L=1e-3)
"source inductance";

Modelica.Electrical.Analog.Ideal.IdealDiode D1,D2,D3,D4,D5,D6;

Modelica.Electrical.Analog.Basic.Resistor r_l(R=1) "load
resistance";

Modelica.Electrical.Analog.Basic.Inductor l_l(L=0.1) "load
inductance";

Modelica.Electrical.Analog.Basic.Ground g;



Real v_out, i_out;



equation

connect(src_a.p,rs[1].p);

connect(src_b.p,rs[2].p);

connect(src_c.p,rs[3].p);

connect(src_a.n,src_b.n);

connect(src_b.n,src_c.n);

connect(src_c.n,g.p);



connect(rs[1].n,ls[1].p);

connect(rs[2].n,ls[2].p);

connect(rs[3].n,ls[3].p);



connect(ls[1].n,D1.p);

connect(D1.p,D4.n);



connect(ls[2].n,D3.p);

connect(D3.p,D6.n);



connect(ls[3].n,D5.p);

connect(D5.p,D2.n);



connect(D1.n,D3.n);

connect(D3.n,D5.n);

connect(D5.n,r_l.p);

connect(r_l.n,l_l.p);

connect(l_l.n,D2.p);

connect(D2.p,D6.p);

connect(D6.p,D4.p);



v_out = r_l.p.v - l_l.n.v;

i_out = r_l.p.i;

end br3ph1;



When I run it using



simulate(br3ph1,stopTime=1.0, numberOfIntervals=5000)



I get a Simulation failed message. The output.log file contains the
 following:



Assertion failed: current_state.real_buffer_ptr +n <
NR_REAL_ELEMENTS, file memory_pool.c, line 99

This application has requested the Runtime to terminate it in an
unusual way.

Please contact the application's support team for more information.


I am new to Modelica so this could well be operator error. Any help
 would be much appreciated.



Regards,



Pranesh Rao


_____________________________________________________________________
 Adrian Pop                      | Ph.D. Open Source Modelica
Consortium | Technical Coordinator Department of Computer Science  |
http://www.ida.liu.se/~adrpo Linköping University            |
phone:+46 76 2343499/+46 13 285781 S-581 83 Linköping, Sweden      |
fax: +46 13 142231 OSMC & LiU/IDA/PELAB | office: 3B:478

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