基于LCL型光储并网逆变器侧电流反馈的有源阻尼策略

doi:10.11930/j.issn.1004-9649.202408046

摘要/Abstract

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。

关键词: 光储逆变器, 有源阻尼, 谐振抑制, 逆变器侧电流反馈, 电网强度

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.

Key words: PV-storage inverter, active damping, resonance suppression, inverter-side current feedback, grid strength

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.

RAN Chengke, TAN Lu, CAO Zhihui, ZHAO Xiaoyue, LI Zhenrong, XIA Xiangyang. Active damping strategy based on current feedback for LCL-type grid-connected inverters with PV-storage systems[J]. Electric Power, 2026, 59(1): 115-123.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202408046

https://www.electricpower.com.cn/CN/Y2026/V59/I1/115

图/表 12

图 1 基于ICFAD的光储逆变器并网控制模型

Fig.1 Grid-connected control model of the PV-storage inverter based on ICFAD

图 2 基于光储逆变侧电流反馈主动有源阻尼的改进控制

Fig.2 Improved control based on active damping with current feedback at PV-storge inverter side

图 3 所提ICFAD方法的单相等效电路模型

Fig.3 Single-phase equivalent circuit model of the proposed ICFAD method

表 1 仿真参数

Table 1 Simulation parameters

设备参数	数值	设备参数	数值
L₁/mH	3.5	V_dc/V	400
L₂/mH	1.75	K_pwm	200
L_g/mH	7.5	开关频率f_sw/kHZ	10
C/μF	15	采样频率 f_s/kHZ	10
v_g/V	110	电网频率 f_g/HZ	50

图 4 不同线路阻抗下阻尼因子与总阻尼增益关系

Fig.4 Relationship between damping factor and total damping gain under different line impedances

图 5 Lg=0 mH时ICFAD方法的开环幅相特性曲线

Fig.5 Open-loop magnitude-phase characteristic curves of the ICFAD method when Lg=0mH

图 6 Lg=3 mH时不同方法开环幅相特性曲线对比

Fig.6 Comparision of open-loop amplitude-phase characteristic curves of different methods when Lg=3 mH

图 7 当Lg=0 mH时采用ICFAD策略的网侧电流波形

Fig.7 Waveforms of grid-side current with the ICFAD strategy when Lg=0 mH

图 8 当Lg=7.5 mH时采用ICFAD策略的网侧电流波形

Fig.8 Waveforms of grid-side current with the ICFAD strategy with Lg=7.5 mH

图 9 半实物仿真实验平台

Fig.9 Semi-physical simulation experiment platform

表 2 实验平台参数

Table 2 Experimental platform parameters

硬件/软件	型号/版本
操作系统	Windows10（64位）
Star Sim RCP	MT1070
StarSim HIL	MT8020
Matlab	2018 b

图 10 采用ICFAD策略电流波形示意图

Fig.10 Current waveforms with ICFAD strategy

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