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Hybrid phase-shifted modulation method for hybrid cascaded H-bridge inverters

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Abstract

Due to its unreasonable DC voltage distribution, the phase-shifted pulse width modulation (PS-PWM) method cannot be directly applied to equal-ratio and equal-difference hybrid CHB inverters. Thus, these types of inverters lose the double-frequency characteristic of the CHB topology. To preserve this double-frequency characteristic, reduce the switching frequency of the high-voltage cells, and simplify the modulation method. This article proposes an optimized topology for the hybrid CHB inverter by optimizing the distribution of the DC voltage. A hybrid PS-PWM method is also proposed by combing the step-wave modulation method and the PS-PWM method. Theoretical analysis, simulation analysis, and experimental results show that the optimized topology and the hybrid PS-PWM method are both valid and feasible.

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Acknowledgements

This work was supported by the National Nature Science Foundation of China under Grant 52067007.

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Correspondence to Wenhua Hu.

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Hu, W., Guo, J., Liu, J. et al. Hybrid phase-shifted modulation method for hybrid cascaded H-bridge inverters. J. Power Electron. 21, 1556–1566 (2021). https://doi.org/10.1007/s43236-021-00287-9

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  • DOI: https://doi.org/10.1007/s43236-021-00287-9

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