Abstract PI controllers are commonly used for the DC-link voltage control of single phase grid-tied inverters. This DC-link voltage is characterized by double-line frequency ripples, which are natural by-product of single phase AC systems. These ripples, if not controlled properly, can adverse the performances of the grid-tied PV system at the AC side, particularly the grid current THD. On the other hand, random and sudden changes of the active power produced by PV panels, during sudden shadow or lighting of PV panels, can lead to high DC-link voltage fluctuations. This paper presents a systematic design methodology to tune the gains of the PI-based DC-link voltage controller so that the DC-link voltage fluctuations as well as the grid current THD are reduced to tolerable limits. Several simulation results are presented and discussed to show the effectiveness of the proposed design methodology.

中文翻译：

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一种用于单相并网光伏系统直流母线电压控制的系统设计方法

摘要 PI 控制器常用于单相并网逆变器的直流母线电压控制。这种直流母线电压的特点是双线频率纹波，这是单相交流系统的自然副产品。这些纹波，如果控制不当，会对交流侧并网光伏系统的性能产生不利影响，尤其是电网电流 THD。另一方面，在光伏电池板突然阴影或照明期间，光伏电池板产生的有功功率的随机和突然变化会导致直流母线电压的高波动。本文提出了一种系统设计方法来调整基于 PI 的直流母线电压控制器的增益，以便将直流母线电压波动和电网电流 THD 降低到可容忍的限度。