Getting Simscape IGBTs to function in a DC-DC converter model

Hello,

Simscape is as close as I can get to verify my research for my masters degree. I am new to using simscape. For the DC-DC model, that is common and easily derived from theory.

I attached 2 models, the one with the label '..._simscape" is the model, physical representative, that is not functioning as intended. The model labelled with 'equiv' is the model I successfully got working using a provided DC-DC equivalent simulink model (XpB=-.3679;XiB=-281.9485;HB=2; Xpb=-.3679;Xib=-.0005;Hb=2;VR=10:VR1=48).

I have not been able to get the model with simscape components functioning properly. The IGBTs are not operating, which I am working through, even though I lowered the gate threshold voltages.

Any assistance or pointers to correct my issue would be greatly appreciated!

Answer 1

[Steve Miller]

Your Simscape model is not running due to the algebraic loops in the model. If you break the algebraic loops, the models run fine.

You can use the Simulink blocks with Simscape physical networks if you wish, but be very careful not to introduce an algebraic loop. The documentation explains why algebraic loops are undesirable and how to identify algebraic loops in your model. If the Simulink blocks in this model represent software, then you can use a Unit delay to represent the sample time of the digital controller.

View the documentation of a buck converter model here: Buck Converter

--Steve