Virtual Inductance Control for Enhancing Stability of LCL Inverter in Weak Grid

WEI Shilei; TIAN Yanjun; WANG Yi; CHEN Bo

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Virtual Inductance Control for Enhancing Stability of LCL Inverter in Weak Grid

更新时间：2025-12-08

- Virtual Inductance Control for Enhancing Stability of LCL Inverter in Weak Grid
- Vol. 45, Issue 6, Pages: 1827-1834(2019)
- 作者机构：
  
  华北电力大学新能源电力系统国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 June 2019，
  
  Published：2019
- 稿件说明：
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WEI Shilei, TIAN Yanjun, WANG Yi, et al. Virtual Inductance Control for Enhancing Stability of LCL Inverter in Weak Grid[J]. 2019, 45(6): 1827-1834.
DOI：

WEI Shilei, TIAN Yanjun, WANG Yi, et al. Virtual Inductance Control for Enhancing Stability of LCL Inverter in Weak Grid[J]. 2019, 45(6): 1827-1834. DOI：

摘要

LCL型逆变器广泛应用于新能源发电并网系统中。在弱电网条件下

并网阻抗与控制参数不匹配是导致系统稳定性下降甚至失稳的主要原因。从削弱不匹配程度的角度出发

基于电流双闭环控制模型

分析了并网阻抗影响系统稳定性的作用机理

提出了网侧串联虚拟电感的改进方法。先增大网侧等效滤波电感的值

再进行控制参数设计

降低了并网阻抗对系统稳定性的影响程度

从而改善了系统稳定性。采用Bode图及根轨迹法对比分析了常规及改进控制策略

结果表明:同等弱电网条件下

采用改进方法系统稳定性更好。此外改进方法可以允许并网阻抗在更大范围内波动

提高了系统对弱电网的适应能力。最后采用Matlab/Simulink仿真进行了验证。

Abstract

LCL inverter has been widely used in grid connected application for renewable power generation. In weak grid

mismatch between grid impedance and control parameters may decrease the system stability

or even lead to instability.Taking the degree of mismatch into account and based on the current double closed-closed loop control model

we analyzed the mechanism of grid impedance affecting the system stability and proposed an improved method of network-side series virtual inductance. The effect of grid impedance on system stability was reduced by increasing the equivalent filter inductance at the grid side before designing the control parameters

which enhances the system stability. The conventional and improved control strategies were compared and analyzed by the Bode diagram and root locus method. The results show that

under the same condition of weak grid

the improved method has better system stability. In addition

the improved method can allow the grid impedance to fluctuate in a larger range and improve the system’s adaptability to weak grids. The above conclusions are verified by Matlab/Simulink simulation.

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Related Institution

College of Automation, Wuhan University of Technology

State Key Laboratory of Advanced Power Transmission Technology, State Grid Global Energy Interconnection Research Institute

Shenzhen Institute of Research and Innovation, The University of Hong Kong

Department of Electrical and Electronics Engineering, The University of Hong Kong

State Grid Economic and Technological Research Institute Co.,Ltd.

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