Abstract

The ANPC (Active Neutral Point Clamped) topology was initially proposed to overcome the unequal loss distribution among the NPC (Neutral Point Clamped) converter power devices. This goal depends deeply on the PWM strategy that is controlling the converter. In this paper, the thermal behavior of the ANPC converter is firstly analyzed. The actual issue is the unequal junction device temperature distribution. So a thermal model based on Foster network is used to estimate the converter switches junction temperatures. In this paper a comparative study of four PWM control strategies is carried out to focus on their influences on the junction temperature distribution among the power devices of the ANPC converter. The comparison is performed with a three level ANPC converter constructed of SKM50GB12T4 IGBT modules. Simulations are performed based on experimental data of the power device. Results are provided to point out the most adapted PMW strategy towards unequal junction temperature distribution and global converter performances.

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