Robust tracking control of LCL-type inverter based on fixed-time extended observer method

Menglin Ma, A. Zhang, Fengzeng Zhu, Haonan Zhang
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Abstract

Single-phase LCL-type inverter has been widely used in the process of grid connection of photovoltaic system. This paper studies the output tracking control problem for this kind of inverter system with unknown external disturbance. First, the mathematical model of the inverter system is established using Kirchhoff's voltage/current law. And an extended system is constructed based on the inverter model and disturbance. And then, an observer is designed to estimate unknown state variables and external disturbance in a fixed time. After that, an input-output linearization method and the observer variables are used to design a robust tracking controller, which ensures the output of inverter system to accurately track a desired trajectory. Finally, numerical examples demonstrate the validity of the presented theoretical results.
基于定时扩展观测器的lcl型逆变器鲁棒跟踪控制
单相lc型逆变器在光伏系统并网过程中得到了广泛的应用。本文研究了一类具有未知外部干扰的逆变系统的输出跟踪控制问题。首先,利用基尔霍夫电压/电流定律建立了逆变器系统的数学模型。在此基础上,建立了基于逆变器模型和扰动的扩展系统。然后,设计观测器在固定时间内估计未知状态变量和外部干扰。然后,利用输入输出线性化方法和观测器变量设计鲁棒跟踪控制器,保证逆变器系统输出精确跟踪期望轨迹。最后,通过数值算例验证了理论结果的有效性。
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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