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首页> 外文期刊>IEEE Transactions on Industrial Electronics >Resonance Damping and Harmonic Suppression for Grid-Connected Current-Source Converter
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Resonance Damping and Harmonic Suppression for Grid-Connected Current-Source Converter

机译：并网电流源变换器的谐振阻尼和谐波抑制

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摘要

Due to the inductor–capacitor $(LC)$ filter, a pulsewidth-modulation (PWM) current-source converter may experience $LC$ resonance. The resonance can be excited by system harmonics either from the PWM process or from the grid voltage distortions and hence results in the line current distorted. In this paper, feedback controls using different variables in the $LC$ filter are first investigated and comprehensively analyzed. It is shown that the inductor-voltage feedback or the capacitor-voltage feedback can damp the current oscillations by increasing the damping ratio, while the inductor-current feedback or the capacitor-current feedback is able to suppress low-order harmonics by raising the resonance frequency. On this basis, a group of combined variable feedback control methods is presented by combining the feedbacks of the inductor/capacitor current and the inductor/capacitor voltage. Thus, not only the current oscillations can be damped, but also the low-order harmonics can be suppressed. Therefore, the line current waveform is improved, and the system performance can be flexibly optimized. A practical design method for feedback gains is also presented in this paper. Finally, the simulation and experimental results verify the feasibility and validity of the proposition.
机译：由于使用了电感电容$（LC）$滤波器，因此脉宽调制（PWM）电流源转换器可能会出现$ LC $谐振。谐振可由PWM过程或电网电压畸变引起的系统谐波激发，从而导致线路电流失真。在本文中，首先研究并全面分析了在$ LC $滤波器中使用不同变量的反馈控制。结果表明，电感电压反馈或电容器电压反馈可以通过增加阻尼比来抑制电流振荡，而电感电流反馈或电容器电流反馈则可以通过提高谐振来抑制低次谐波。频率。在此基础上，通过组合电感/电容器电流和电感/电容器电压的反馈，提出了一组组合的可变反馈控制方法。因此，不仅可以抑制电流振荡，而且可以抑制低阶谐波。因此，改善了线电流波形，并且可以灵活地优化系统性能。本文还提出了一种实用的反馈增益设计方法。最后，仿真和实验结果验证了该命题的可行性和有效性。

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