An Enhanced Control System for Single-Phase Inverters Interfaced With Weak and Distorted Grids
An Enhanced Control System for Single-Phase Inverters Interfaced With Weak and Distorted Grids
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DOI：
10.1109/tpel.2019.2909532
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发表时间：
2019-04
影响因子：
6.7
通讯作者：
Sushil Silwal;S. Taghizadeh;M. Karimi-Ghartemani;M. J. Hossain;M. Davari
中科院分区：
文献类型：
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作者：
Sushil Silwal;S. Taghizadeh;M. Karimi-Ghartemani;M. J. Hossain;M. Davari
为了改善一类单相并网逆变器在弱电网和电网失真条件下运行的性能，提出了一种增强型电流控制器。设计为在正常(强或硬且干净)电网条件下运行的逆变器在弱且扭曲的电网条件下可能不能令人满意地运行。一个主要原因是同步或锁相环(PLL)的干扰动态。为了解决这一问题，本文提出了一种针对一类流行的单相逆变器的增强控制结构。提出的思想是将锁相环状态变量包含到主逆变器控制器中，从而最小化锁相环与其他元件的不良交互作用。提出了一种控制器增益的优化设计方法。与传统的控制器相比，所提出的控制器在更广泛的弱和扭曲的网格条件下具有更强的鲁棒性。给出了大量的仿真和实验结果，以验证所提出的控制方法。
This paper presents an enhanced current controller for improving the performance of a class of single-phase grid-connected inverters operating in weak and distorted grid conditions. An inverter designed to operate at normal (strong or stiff and clean) grid conditions may not perform satisfactorily during weak and distorted grid conditions. One major reason is the interfering dynamics of the synchronization or phase-locked loop (PLL). This paper proposes an enhanced control structure for a popular class of single-phase inverters to address this problem. The proposed idea is to include the PLL state variables into the main inverter controller thereby minimizing the undesirable interactions of the PLL with the other components. A method for optimally designing the controller gains is also proposed. Compared to the conventional one, the proposed controller is shown to have a more robust performance over a substantially wider range of weak and distorted grid conditions. Extensive simulation and experimental results are presented to validate the proposed controls.