Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Evaluation of DPWM schemes for Si/SiC three-level hybrid active NPC inverters

  • Zhuge, Huizi (College of Energy and Electrical Engineering, Hohai University) ;
  • Zhang, Li (College of Energy and Electrical Engineering, Hohai University) ;
  • Lou, Xiutao (College of Energy and Electrical Engineering, Hohai University) ;
  • Lei, Zhengzi (College of Energy and Electrical Engineering, Hohai University) ;
  • Zou, Yuhang (Jiangsu Key Laboratory of New Energy Generation and Power Conversion, Nanjing University of Aeronautics and Astronautics)
  • Received : 2021.12.14
  • Accepted : 2022.06.16
  • Published : 2022.11.20
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Abstract

The hybrid utilization of SiC and Si devices can achieve a trade-of between the efficiency and cost of three-level active neutral-point-clamped (3L-ANPC) inverters. This paper studies a three-phase 2-SiC 3L-hybrid ANPC (3L-HANPC) inverter with different discontinuous pulse width modulation (DPWM) schemes. The principles of these DPWM schemes are analyzed in detail, and carrier-based algorithm for two of the DPWM schemes are given. Finally, a 6 kW three-phase 2-SiC 3L-HANPC inverter prototype was built to compare these two modulation schemes. Experimental results show that DPWM1 with its peak voltage-clamped can achieve a higher efficiency than DPWM2 with its zero-crossing clamped. However, the DPWM2 scheme has a lower THD than the DPWM1 scheme. Since the THD improvement contributed by the DPWM2 scheme is relatively small, the DPWM1 scheme is the preferred DPWM scheme.

Keywords

Acknowledgement

This paper was supported in part by the National Natural Science Foundation of China under Grant 52177176, and the Six Talent Peaks Project in Jiangsu Province under Grant 2019-TD-XNY-001.

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