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Abdessamed

Is it correct to use three current sources in star connection? and three voltage sources in delta connection?

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This question is frequently asked because three current sources in star connection can lead to convergence problems (and as well three voltage sources in delta connection). This configuration imposes more equations than there are unknowns to find during the solving process.

 

The easiest solution to avoid this issue is to model only two sources instead of three. The voltage or current on the third branch will be imposed by the two others, and the computation will be correct.

 

Flux online help explains it with more details:

file:///C:/Altair/Flux_12.2/Help/Flux/english/Website/index.html?SourceDeTensionTriphaseeEnTriangle

file:///C:/Altair/Flux_12.2/Help/Flux/english/Website/SourceDeCourantTriphaseEnEtoile.html?key=current sources

 

It is also correct to model the three current sources, but a high resistance must be added in parallel with the 3rd part of the star connection.

 

 

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