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首页> 外文期刊>IEEE Transactions on Industrial Electronics >A Bandpass Filter Incorporated Into the Inductor Current Feedback Path for Improving Dynamic Performance of the Front-End DC–DC Converter in Two-Stage Inverter
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A Bandpass Filter Incorporated Into the Inductor Current Feedback Path for Improving Dynamic Performance of the Front-End DC–DC Converter in Two-Stage Inverter

机译：带通滤波器集成到电感电流反馈路径中，以改善两阶段逆变器前端DC-DC转换器的动态性能

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摘要

The instantaneous output power of a two-stage single-phase inverter pulsates at twice the output voltage frequency, generating second harmonic current (SHC) in the front-end dc–dc converter. To reduce the SHC, this paper proposes a virtual impedance based control strategy. For the case of adopting a resistor as the virtual impedance, a closed-loop parameter design method is presented, revealing that the voltage loop crossover frequency is relatively low under such circumstance. To overcome this problem, a control strategy incorporating a bandpass filter (BPF) into the inductor current feedback path is put forward and a damping resistor is further added into the BPF for the purpose of improving the system stability margin. Hence, the proposed control scheme can not only reduce the SHC significantly, but also improve the dynamic performance of the front-end dc–dc converter effectively while guaranteeing the stability of the converter. Finally, a 1-kVA prototype is built and tested in the laboratory, and the experimental results are presented to verify the effectiveness of the proposed control strategy.
机译：两级单相逆变器的瞬时输出功率以两倍于输出电压频率的频率脉动，从而在前端dc-dc转换器中产生二次谐波电流（SHC）。为了降低SHC，本文提出了一种基于虚拟阻抗的控制策略。对于采用电阻作为虚拟阻抗的情况，提出了一种闭环参数设计方法，揭示了在这种情况下电压环的交叉频率相对较低。为了克服这个问题，提出了一种将带通滤波器（BPF）集成到电感器电流反馈路径中的控制策略，并在该BPF中进一步添加了一个阻尼电阻器，以提高系统稳定性。因此，所提出的控制方案不仅可以显着降低SHC，而且可以在保证转换器稳定性的同时有效地改善前端dc-dc转换器的动态性能。最后，建立了一个1-kVA原型并在实验室中进行了测试，并给出了实验结果以验证所提出的控制策略的有效性。

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