Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Hybrid phase-shifted modulation method for hybrid cascaded H-bridge inverters

  • Hu, Wenhua (School of Electrical and Automation Engineering, East China Jiaotong University) ;
  • Guo, Jiamin (School of Electrical and Automation Engineering, East China Jiaotong University) ;
  • Liu, Jianfeng (School of Electrical and Automation Engineering, East China Jiaotong University) ;
  • Yuan, Yisheng (School of Electrical and Automation Engineering, East China Jiaotong University)
  • Received : 2021.04.07
  • Accepted : 2021.07.15
  • Published : 2021.10.20
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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.

Keywords

Acknowledgement

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

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