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PSC-PWM modulated MPC for cascaded H-bridge power supplies

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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of the traditional fixed switching frequency model predictive control (MPC) using synchronous carrier modulation is no longer applicable.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 significant 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.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

National Natural Science Foundation of China, 11275056

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Authors and Affiliations

  1. School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, China

    Bichen Yan, Haihong Huang & Haixin Wang

Authors
  1. Bichen Yan
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  2. Haihong Huang
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  3. Haixin Wang
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Correspondence to Bichen Yan.

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Yan, B., Huang, H. & Wang, H. PSC-PWM modulated MPC for cascaded H-bridge power supplies. J. Power Electron. 23, 746–757 (2023). https://doi.org/10.1007/s43236-022-00579-8

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  • DOI: https://doi.org/10.1007/s43236-022-00579-8

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