A simple and effective time delay compensation method for grid-connected inverter with an LCL filter: Application to active damping method
A simple and effective time delay compensation method for grid-connected inverter with an LCL filter: Application to active damping method
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DOI：
10.1109/compel.2017.8013385
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发表时间：
2017-07
期刊：
影响因子：
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通讯作者：
Masaki Semasa;T. Kato;Kaoru Inoue
中科院分区：
文献类型：
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作者：
Masaki Semasa;T. Kato;Kaoru Inoue
并网逆变器在其输出端后装有LCL滤波器。该滤波器具有谐振特性，人们研究了多种有源阻尼方法来抑制谐振效应。逆变器通常采用数字控制，由于A/D转换、计算时间等原因，不可避免地存在控制延时，这会降低逆变器的稳定性和阻尼效果，因为逆变器的频率特性与其设计的频率特性不同，特别是在谐振频率附近。本文提出了一种简单有效的控制时滞补偿方法，以提高阻尼效果。它是基于延迟时间的未来状态值的估计方法。将该方法应用于并网逆变器的控制，通过实验验证了该方法的有效性。
A grid-connected inverter is equipped with an LCL filter after its output. This filter has a resonant characteristic and many active damping methods have been researched to suppress the resonant effects. The inverter is often controlled digitally and there is a control time delay which is inevitable due to A/D conversion, computation times, and so on. This delay degrades stabilities and damping effects of the inverter because frequency characteristics are different from its designed one especially around the resonant frequency. This paper proposes a simple and effective compensation of the control time delay to improve the damping effects. It is based on an estimation method of future state values advanced by the delay time. The proposed method is applied to the grid-connected inverter control and its effectiveness is investigated and validated through transfer functions of the regulated current errors by experiment.