Re: Problem with OpenModelica simulation

[Adrian Pop]

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