Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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PSC-PWM modulated MPC for cascaded H-bridge power supplies

  • Bichen Yan (School of Electrical Engineering and Automation, Hefei University of Technology) ;
  • Haihong Huang (School of Electrical Engineering and Automation, Hefei University of Technology) ;
  • Haixin Wang (School of Electrical Engineering and Automation, Hefei University of Technology)
  • Received : 2022.08.02
  • Accepted : 2022.12.07
  • Published : 2023.05.20
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Abstract

In the high-power applications of cascaded H-bridge (CHB) converters, when considering the limitations of the switching characteristics of the power device, the phase-shifted carrier's pulse width modulation (PSC-PWM) is used to increase the equivalent switching frequency to improve the output quality. However, interleaved carriers make the CHB output characteristics change. Thus, the optimal performance of the traditional fxed switching frequency model predictive control (MPC) using synchronous carrier modulation is no longer applicable. Moreover, it is difficult for the traditional state-space predictive model to quickly eliminate the prediction error caused by a model mismatch in the transient response process. Therefore, parameter mismatch under high uncertainties leads to a signifcant decrease in the transient optimization performance. In this study, a PSC-PWM modulated MPC is proposed to replace the fixed switching frequency with PSC-PWM and to suppress the parameter mismatching in the predictive model by an adaptive observer. The CHB output voltage is regarded as a whole based on the voltage-second balanced rule within an equivalent switching period to use the adaptive observer. The CHB optimal vector duration calculated by the optimization strategy at each sampling time is implemented by the PSC-PWM within an associated H-bridge carrier period. Excellent dynamic and transient performances of the reference tracking can be obtained by the proposed method at similar carrier frequencies. Finally, the tracking performances are verified by experiments conducted on a 5L-CHB.

Keywords

Acknowledgement

National Natural Science Foundation of China, 11275056

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