Deadbeat Repetitive Control for a grid-connected inverter with LCL Filter

2019 IEEE 15th International Conference on Control and Automation (ICCA) Pub Date : 2019-07-01 DOI:10.1109/ICCA.2019.8899637

Ye Tao, Cuilan Tan, Qihong Chen, Liyan Zhang, Keliang Zhou, Li Liu

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引用次数: 2

Abstract

In order to improve the quality of the power injected into the grid, a deadbeat (DB) control strategy based on weighted average current with plug-in repetitive control (RC) scheme is proposed for a grid-connected inverter with LCL filter. Firstly, we calculate weighted average current of input and output current of the LCL filter, and use this variable to simplify the control strategy. Therefore, the equivalent model of the LCL filter is reduced from the third-order to the first-order. Secondly, DB controller is designed in discrete-time based on this simplified model. In order to suppress the harmonics of fed-in grid current, the RC is proposed to plug-in with the DB controller in parallel by providing the required harmonic elimination of the periodic signals. In the proposed combined control, the deadbeat control can track a given signal with fast dynamic response, and the RC can make the steady state error converge to zero gradually. The simulation and experimental results have demonstrated the effectiveness and advantages of the proposed method.

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带LCL滤波器并网逆变器的无差拍重复控制

为了提高并网逆变器的馈电质量，提出了一种基于加权平均电流和插入式重复控制(RC)的无差拍控制策略。首先，我们计算LCL滤波器输入和输出电流的加权平均电流，并利用该变量简化控制策略。因此，LCL滤波器的等效模型由三阶降为一阶。其次，在此简化模型的基础上设计了离散时间的DB控制器。为了抑制电网输入电流的谐波，提出了将RC与DB控制器并联插入，以提供周期信号所需的谐波消除。在本文提出的组合控制中，无差拍控制可以快速跟踪给定信号，RC可以使稳态误差逐渐收敛到零。仿真和实验结果验证了该方法的有效性和优越性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 IEEE 15th International Conference on Control and Automation (ICCA)

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