| 摘 要: 针对传统双环 PI 控制无桥 Boost PFC 存在输入电流过零畸变、输出电压超调量大、动态响应慢、鲁棒性不足等问题，本文在梳理近年无桥 PFC 主流控制方案基础上，提出一种电压环模糊自适应 PI + 电流环 PI + 输入电压前馈的复合控制策略。通过前馈补偿快速抵消输入电压扰动，抑制谐波与过零畸变；通过模糊逻辑实时调节 PI 参数，提升变工况动态性能。为验证策略通用性与鲁棒性，在 MATLAB 中完成额定工况、宽输入电压（180-260V）、负载突变、电网频率波动（47-53Hz）多工况仿真。结果表明所提策略在额定条件下输入电流 THD=2.87%，功率因数 PF=0.9985，电压超调<5%，调节时间28ms；在宽电压与负载突变工况下仍保持 THD<3.5%、PF>0.998，电压波动<3%，具备强鲁棒性与工程实用价值。 |
| 关键词: 无桥 Boost PFC 模糊自适应 PI 输入电压前馈 总谐波畸变 Simulink 仿真 |
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| Research on Bridgeless Boost PFC Control Based on Fuzzy PI and Feedforward Compensation |
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liuluanyang, chenqianlong, songqingmin, fenglijuan, lijiangjiang
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Zhengzhou Institute of Science and Technology
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| Abstract: Aiming at the problems of input current zero-crossing distortion, large output voltage overshoot, slow dynamic response and insufficient robustness in bridgeless Boost PFC with traditional double-loop PI control, this paper proposes a composite control strategy combining voltage-loop fuzzy adaptive PI, current-loop PI and input voltage feedforward. Feedforward compensation suppresses harmonics and zero-crossing distortion by counteracting input voltage disturbances, while fuzzy logic adjusts PI parameters in real time to enhance dynamic performance under variable conditions. Multi-condition simulations in MATLAB (rated condition, 180–260 V wide input voltage, load sudden change, 47–53 Hz grid frequency fluctuation) verify its universality and robustness. Results show that under rated conditions, input current THD=2.87%, PF=0.9985, voltage overshoot<5% and settling time=28 ms; under wide voltage and load sudden change conditions, THD<3.5%, PF>0.998 and voltage fluctuation<3%, indicating strong robustness and engineering application value. |
| Keywords: Bridgeless Boost PFC Fuzzy Adaptive PI Input Voltage Feedforward THD Simulink Simulation |
