Simscape Electrical is well suited for electro-thermal simulations. The discretes in Simscape Electrical (IGBT, MOSFET, etc) have the optional thermal port. Some composite converters also have the option to enable thermal effects:
For an example that shows how to analyze the performance of a liquid cooling system for a three-phase inverter check this:
If you’re working at the converter level and do not want the individual switching devices, the good news is that the Average-Value Voltage Source Converter (Three-Phase) block also has the option to enable the thermal port of the block and model thermal parameters:
