Comparative analysis of power losses for 3-Level NPC and T-type inverter modules

Abstract

In this paper, power losses of 3-level NPC inverter (3LNPCI) and 3-level T-type inverter (3LTI) are classified and calculated according to the switching states. The conduction loss depends on modulation index (MI) and power factor (PF), whereas the switching loss depends on switching frequency, so the power loss analyses have been done at the different operating points of MI, PF, and switching frequency. And power losses of 3LNPCI and 3LTI with NPC and T-type inverter dedicated modules are calculated based on the theoretical formula and PSiM thermal module by using the real parameter values of switching devices. For the comparison of power losses of NPC and T-type inverters, all parameters have been referred from the data sheets of the different manufacturing companies.