Simscape Electrical includes multiple Simscape-based IGBT models with different levels of detail. The IGBT (Ideal, Switching) block is the lowest level of detail and represents the IGBT as an immediate on/off transition. The N-Channel IGBT block provides the capability of either Simplified I-V characteristics and event-based timing or Full I-V and capacitance characteristics. Either block also permits optional representation of thermal effects - for low detail the thermal model doesn't impact the electrical behavor, for high detail the temperature affects the electical parameters.
The best way to get started would be to review these examples: