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<p>The Swiss rectifier is a three-phase buck-type rectifier. It can achieve unity power factor (PF) on the AC-side. It is particularly suitable for applications like electric vehicle charging stations and aerospace power systems. To deal with the complexities in controlling the Swiss rectifiers in practical engineering scenarios, an easily implementable control method is proposed. This method integrates harmonic mitigation and PF optimization. It employs a single PI controller in the voltage loop, enabling the average input current over each control period to directly track the three-phase reference input current command. The modulation process based on the recursive Forgetting Filter Algorithm (FFA) further improves the robustness of the DC-side voltage control. As a result, the interference of the DC output inductor current fluctuations on the control loop is minimized. Moreover, the proposed method takes the negative impact of the filter capacitors on the AC-side PF into account. Experimental evaluations carried out on a prototype at various power levels show that this method attains a better AC-side PF and lower input current harmonics compared to the Classic Dual PI Control (CDPIC) method. These results verify the effectiveness and practicality of the proposed control method.</p>

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Harmonic mitigation and power factor optimization of single-stage Swiss rectifier via recursive forgetting filter algorithm

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Weidong Jiang,
  • Shengyu Liu,
  • Haoran Jiang,
  • Jinping Wang

摘要

The Swiss rectifier is a three-phase buck-type rectifier. It can achieve unity power factor (PF) on the AC-side. It is particularly suitable for applications like electric vehicle charging stations and aerospace power systems. To deal with the complexities in controlling the Swiss rectifiers in practical engineering scenarios, an easily implementable control method is proposed. This method integrates harmonic mitigation and PF optimization. It employs a single PI controller in the voltage loop, enabling the average input current over each control period to directly track the three-phase reference input current command. The modulation process based on the recursive Forgetting Filter Algorithm (FFA) further improves the robustness of the DC-side voltage control. As a result, the interference of the DC output inductor current fluctuations on the control loop is minimized. Moreover, the proposed method takes the negative impact of the filter capacitors on the AC-side PF into account. Experimental evaluations carried out on a prototype at various power levels show that this method attains a better AC-side PF and lower input current harmonics compared to the Classic Dual PI Control (CDPIC) method. These results verify the effectiveness and practicality of the proposed control method.