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Evaluation of DPWM schemes for Si/SiC three-level hybrid active NPC inverters

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Abstract

The hybrid utilization of SiC and Si devices can achieve a trade-off 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.

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Acknowledgements

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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Authors and Affiliations

  1. College of Energy and Electrical Engineering, Hohai University, Nanjing, China

    Huizi Zhuge, Li Zhang, Xiutao Lou & Zhengzi Lei

  2. Jiangsu Key Laboratory of New Energy Generation and Power Conversion, Nanjing University of Aeronautics and Astronautics, Nanjing, China

    Yuhang Zou

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  1. Huizi Zhuge
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  2. Li Zhang
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  3. Xiutao Lou
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  4. Zhengzi Lei
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  5. Yuhang Zou
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Correspondence to Li Zhang.

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Zhuge, H., Zhang, L., Lou, X. et al. Evaluation of DPWM schemes for Si/SiC three-level hybrid active NPC inverters. J. Power Electron. 22, 1825–1835 (2022). https://doi.org/10.1007/s43236-022-00487-x

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  • DOI: https://doi.org/10.1007/s43236-022-00487-x

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