Active damping strategy based on current feedback for LCL-type grid-connected inverters with PV-storage systems

冉成科; 谭璐; 曹志辉; 赵晓悦; 李贞容; 夏向阳

doi:10.11930/j.issn.1004-9649.202408046

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Active damping strategy based on current feedback for LCL-type grid-connected inverters with PV-storage systems

更新时间：2026-02-03

- Active damping strategy based on current feedback for LCL-type grid-connected inverters with PV-storage systems
- Vol. 59, Issue 1, Pages: 115-123(2026)
- 作者机构：
  
  1. 湖南机电职业技术学院,湖南,长沙,410151
  2. 长沙理工大学电气与信息工程学院,湖南,长沙,410114
- 作者简介：
- 基金信息：
- DOI：10.11930/j.issn.1004-9649.202408046
  CLC：
- Published Online：13 January 2026，
  
  Published：13 January 2026
- 稿件说明：
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冉成科, 谭璐, 曹志辉, 赵晓悦, 李贞容, 夏向阳. 基于LCL型光储并网逆变器侧电流反馈的有源阻尼策略[J]. 中国电力, 2026, 59(1): 115-123.

冉成科, 谭璐, 曹志辉, et al. Active damping strategy based on current feedback for LCL-type grid-connected inverters with PV-storage systems[J]. 2026, 59(1): 115-123.
冉成科, 谭璐, 曹志辉, 赵晓悦, 李贞容, 夏向阳. 基于LCL型光储并网逆变器侧电流反馈的有源阻尼策略[J]. 中国电力, 2026, 59(1): 115-123. DOI： 10.11930/j.issn.1004-9649.202408046.

冉成科, 谭璐, 曹志辉, et al. Active damping strategy based on current feedback for LCL-type grid-connected inverters with PV-storage systems[J]. 2026, 59(1): 115-123. DOI： 10.11930/j.issn.1004-9649.202408046.

摘要

随着光伏渗透率的持续攀升，光储并网系统造成LCL滤波器固有谐振频率偏移的问题越发凸显，已成为系统稳定运行的关键瓶颈。提出基于逆变器侧电流反馈的有源阻尼控制策略。首先，建立该策略下逆变器经LCL滤波器并网的小信号传递函数；其次，采用fmincon函数搜索该传递函数最佳阻尼因子；最后，基于搜索结果设计有源阻尼控制器的最优参数。有效抑制系统偏移的谐振尖峰，同时克服求解三阶系统特征根的局限性。仿真结果表明，所提控制策略在电网不同短路比下均具备谐振抑制效果，有效提升光储并网系统运行稳定性。

Abstract

With the continuous rise in photovoltaic(PV) penetration

the problem of inherent resonant frequency offset of LCL filters caused by PV-storage grid-connected systems has become increasingly prominent

which has evolved into a key bottleneck restricting the stable operation of the systems. An inverter-side current feedback active damping (ICFAD) strategy is proposed. Firstly

the small-signal transfer function of the inverter connected to the grid via the LCL filter under this strategy is established. Secondly

the fmincon function is adopted to search for the optimal damping factor of the transfer function. Finally

the optimal parameters of the active damping controller are designed based on the search results. This strategy can effectively suppress the shifted resonant peaks of the system while overcoming the limitations in solving the characteristic roots of the third-order systems. Simulation results demonstrate that the proposed control strategy exhibits resonant suppression performance under different short-circuit ratios of the power grid

thus effectively improving the operational stability of PV-storage grid-connected systems.

关键词

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references

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