DESIGN OF DIGITAL H∞ ROBUST CONTROLLER FOR PHOTOVOLTAIC GRID-CONNECTED INVERTER IN WEAK GRID

被引：0
|
作者：
Xie B. [1 ]
Li P. [1 ]
Su J. [1 ]
Liu T. [2 ]
Huang C. [1 ]
Huang Z. [1 ]
机构：
[1] Hefei University of Technology, Research Center for Photovoltaic System Engineering of Ministry of Education, Hefei
[2] State Grid Anhui Ultra High Voltage Company, Hefei
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2023年 / 44卷 / 02期
关键词：
controlling time delay; digital H[!sub]∞[!/sub] controller; inverters; PV power; weak grid;
D O I：
10.19912/j.0254-0096.tynxb.2021-0338
中图分类号：
学科分类号：
摘要：
Due to the influence of grid impedance, the photovoltaic（PV）grid-connected inverter may be unstable under the weak grid. This paper proposes a digital H∞ robust controller design method for PV grid-connected inverter. Firstly, this work establishes the control model of PV grid-connected inverter under the traditional control strategy, and analyzes its stability under weak grid. In order to improve the robustness of LCL-filtered PV grid-connected inverter against the variation of grid impedance, the standard H∞ control model of PV grid-connected inverter is established in discrete domain with considering the influence of digital control delay. And the digital H∞ controller is designed by appropriately selecting the weighting functions. Compared with the traditional dual current loop control strategy, the simulation and experimental results in this paper prove that the designed digital H∞ controller significantly enhances the stability of PV grid-connected inverter in weak grid. © 2023 Science Press. All rights reserved.
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页码：353 / 360
页数：7
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