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Accurate harmonic analysis of dual-frequency inverter considering dead-time effect

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Abstract

Wireless power transfer (WPT) systems or simultaneous wireless information and power transfer (SWIPT) systems support multiple charging frequency standards and usually transmit two or more frequencies simultaneously. Multi-frequency sinusoidal pulse width modulation (MF-SPWM) technology can output multiple sine wave frequencies at the same time with only one inverter, which effectively reduces the system size and improves compatibility. However, MF-SPWM and dead-time make the MF-inverter highly nonlinearized, with significant effects on the desired frequencies and the total harmonic distortion (THD) of the multi-frequency output. In this paper, a double Fourier series-based method of harmonic analysis for the dual-frequency inverter (DF-inverter) is proposed, which can accurately calculate the magnitude of each of the harmonics in the output of the DF-inverter taking into account the influence of dead-time. The calculation methods of the minimum pulse width and voltage THD of the DF-inverter are provided. An analysis shows that when the dead-time is less than the minimum pulse width, its influence is negligible. Meanwhile, when the dead-time is slightly larger than the minimum pulse width, there is a trade-off between the desired frequency component and the THD. Experimental results are given and they are consistent with the analytical results of the proposed method, and the error is within 2%.

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Acknowledgements

This work was supported in part by the Natural Science Foundation of Henan Province under Grant 232300420092, in part by the Scientific and Technological Program of Henan Province under Grant 232102240051, and in part by the International Scientific and Technological Cooperation Projects in Henan Province under Grant 232102520003 and 242102521038.

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Authors and Affiliations

  1. School of Electrical and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou, China

    Jie Wu, Zhiliang Yang, Yafei Chen, Zhenjun Wu & Jitao Zhang

  2. Luohe Cigarette Factory of Henan China Tobacco Industry Co., LTD., Luohe, China

    Wenlei Wang

  3. School of Computer Science and Engineering, Shandong University of Science and Technology, Shandong, China

    Jeng-Shyang Pan

  4. Vysoká Škola Báňská (VSB) Technical University of Ostrava, Ostrava, Czech Republic

    Vaclav Snasel

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  1. Jie Wu
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Correspondence to Jie Wu.

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Wu, J., Yang, Z., Wang, W. et al. Accurate harmonic analysis of dual-frequency inverter considering dead-time effect. J. Power Electron. (2024). https://doi.org/10.1007/s43236-024-00795-4

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