ROBUST CONTROL STRATEGY OF LCL-TYPE GRID-CONNECTED INVERTER BASED ON DELAY COMPENSATION

被引：0
|
作者：
Liang J. [1 ]
Kong F. [1 ]
Wang Z. [2 ]
Li X. [1 ]
Ding X. [3 ]
Chen Y. [1 ]
机构：
[1] School of Electrical Engineering, Guangxi University, Nanning
[2] School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou
[3] Guangxi Vocational College of Water Resources and Electric Power, Nanning
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2023年 / 44卷 / 12期
关键词：
active dampening; delay compensation; grid-connected inverter; robustness; weak grid;
D O I：
10.19912/j.0254-0096.tynxb.2022-1371
中图分类号：
学科分类号：
摘要：
In order to reduce the influence of control delay on active damped equivalent virtual impedance in LCL grid- connected inverter control, an improved control strategy based on active damped inner loop cascaded lead is proposed in this paper. Firstly，a mathematical model including the delay is established，which shows that the time delay will damage the positive frequency range of virtual impedance，threatening the stability of the inverter. Meanwhile，the mechanism of traditional inverter- side current feedback active damping lowering the low-frequency gain is analyzed. Then，an improved delay compensation scheme with a cascaded leading compensator is proposed to widen the stability region. The low-frequency gain reduction can be improved by designing a suitable gain function in the damping loop. Through the proposed delay compensation scheme，the equivalent positive damping frequency range extends to （0，0.48fs）. An expected active damping performance and strong stability of the system is obtained. Simulation and experimental results verified the validity of the proposed strategy. © 2023 Science Press. All rights reserved.
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页码：444 / 452
页数：8
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