LCL型并网逆变器数字单环控制延时影响与稳定域分析设计

PAN Hongbin

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LCL型并网逆变器数字单环控制延时影响与稳定域分析设计

更新时间：2025-08-13

- LCL型并网逆变器数字单环控制延时影响与稳定域分析设计
- Automation of Electric Power Systems Vol. 40, Issue 6, Pages: 85-90(2016)
- 作者机构：
  
  湘潭大学控制研究所,湖南省,湘潭市,411105
- 作者简介：
- 基金信息：
- DOI：
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- Published：2016
- 稿件说明：
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PAN Hongbin. [J]. Automation of electric power systems, 2016, 40(6): 85-90.
DOI：

PAN Hongbin. [J]. Automation of electric power systems, 2016, 40(6): 85-90. DOI：

摘要

数字控制可靠性高、控制灵活，但存在数字延时，改变了系统稳定性。在考虑计算、采样等数字延时情况下，采用直接数字法，建立LCL型并网逆变器离散精确数学模型，在连续域和离散域下，对网侧电流单环控制稳定性进行对比分析，说明数字延时改变对系统稳定性的影响，基于此在网侧电流单环反馈控制中设置数字延时为滞后一拍，主要分析滞后一拍情况下采样频率和谐振频率之比对稳定性的影响，得出其稳定的范围，同时对控制器参数进行了设计。仿真和实验证明了所提方法的正确性和有效性。

Abstract

Digital control cannot avoid control delay in spite of its high reliability and flexible control

which can change the stability of the system. A discrete accurate mathematical model of the LCL-typed grid-connected inverter is developed and the direct digital method is adopted with the digital delay elements such as computation

sampling taken into account. The system stability with single-loop control based on grid-side current is comparatively analyzed in continuous domain and discrete domain

which accounts for the influence of the digital delay on the system stability. Thus the stability influence of the frequency ratio range of the sample and resonance based on grid-side current control is mainly analyzed when the digital delay is set one-step delay and the frequency ratio range is obtained

meanwhile the parameters of the controller are designed. Simulation and experiment proves the correctness and effectiveness of the proposed method.

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