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

doi:10.11930/j.issn.1004-9649.202408046

Abstract

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

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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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202408046

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

Figures/Tables 12

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

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

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

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

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

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

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

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

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

Fig.9 Semi-physical simulation experiment platform

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

Fig.10 Current waveforms with ICFAD strategy

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