Opened 10 years ago
Last modified 10 years ago
#3084 accepted defect
Under-determined linear system not solvable!
| Reported by: | Owned by: | Willi Braun | |
|---|---|---|---|
| Priority: | high | Milestone: | Future |
| Component: | *unknown* | Version: | trunk |
| Keywords: | Cc: |
Description
I noticed that the simulation of one the following examples in Modelica_Electrical_PowerConverters.Examples.ACDC.ThyristorBridge2mPulse
- ThyristorBridge2mPulse_R
- ThyristorBridge2mPulse_RL
- ThyristorBridge2mPulse_RLV
- ThyristorBridge2mPulse_RLV_Characteristic
- ThyristorBridge2mPulse_DC_Drive
causes multiple error messages of the kind:
under-determined linear system not solvable! Matrix singular!
The first three examples at least simulate, even though these error messages occur. Example 4 takes too long to wait for the simulation to end. Example 5 does not finish simulation at all.
I have to note, however, that these examples have been working in previous versions of OpenModelica. The actual bug report refers to
- Ubuntu 14.04 32 bit
- OpenModelica r24056
- Library Modelica_Electrical_PowerConverters located on https://svn.modelica.org/projects/Modelica_ElectricalSystems/Modelica_Electrical_PowerConverters/branches/Modelica_Electrical_PowerConverters%203.2.1; a modified version of this library is planned to be included in MSL 3.2.2
I am not sure whether this ticket is related with #2996 or not.
Change History (3)
comment:1 by , 10 years ago
| Owner: | changed from to |
|---|---|
| Status: | new → assigned |
comment:2 by , 10 years ago
comment:3 by , 10 years ago
| Status: | assigned → accepted |
|---|
All of the samples 1-5 are working currently, but example 4-5 are really slow.
It seems that there is a non-linear algebraic loop, which is currently linear.
Quick update: I just checked the issue under Debian Wheezy 64 bit with OMEdit r23888. Examples 1-4 now simulate without problems; example 5 fails with the same error as mentioned above.