Document Type

Conference Proceeding



Format of Original

7 p.

Publication Date



Institute of Electrical and Electronics Engineers (IEEE)

Source Publication

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

Source ISSN



This paper investigates the power cycling lifetime of a three-phase three-level neutral-point-clamped (NPC) inverter used in a 50-kVA adjustable speed drive (ASD). Considering the short lifetime of NPC inverters under low output frequency conditions, an improved discontinuous pulse width modulation (DPWM) method is introduced to extend the inverter lifetime. This improved DPWM method is achieved by injecting a zero-sequence signal with relative high frequency into the voltage reference signals, which is in order to obtain lower swing value of the junction temperatures in the Insulated Gate Bipolar Transistors (IGBTs). Both simulation and experimental results are presented to verify the effectiveness of this solution.


Accepted version. Published as part of the proceedings of the 2016 IEEE Applied Power Electronics Conference and Exposition (APEC), 2016: 2826-2832. DOI. © 2016 IEEE. Used with permission.