RESEARCH ON HYBRID DAMPING ADAPTIVE RESONANCE SUPPRESSION METHOD FOR GRID CONNECTED INVERTERS CONSIDERING SHORT CIRCUIT RATIO

Wang Xiaohuan; Chen Xiheng; Min Fan; Zhao Xiaojun

doi:10.19912/j.0254-0096.tynxb.2024-0495

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (8) : 585-595. DOI: 10.19912/j.0254-0096.tynxb.2024-0495

RESEARCH ON HYBRID DAMPING ADAPTIVE RESONANCE SUPPRESSION METHOD FOR GRID CONNECTED INVERTERS CONSIDERING SHORT CIRCUIT RATIO

Wang Xiaohuan, Chen Xiheng, Min Fan, Zhao Xiaojun

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Abstract

Due to the intermittent and stochastic characteristics of renewable energy power generation, large-scale grid connection can cause significant fluctuations in grid strength, which adversely affects the stability of grid-connected control systems. To address this issue, this paper establishes a system impedance model for an LCL-type three-phase grid-connected inverter, conducts an in-depth analysis of the impact of dynamic grid strength variations on the inverter’s output equivalent impedance, and reveals the result of resonance frequency migration. Based on the above theoretical analysis, this paper proposes an adaptive resonance suppression method with hybrid damping considering the short circuit ratio （SCR）. This method dynamically adjusts the weighted control coefficients according to the real-time SCR value of the power generation system, adaptively responds to system resonance frequency migration, effectively suppresses resonance, and ensures stable grid-connected currents under different grid strengths. This approach can not only operate effectively when the power grid intensity varies over a wide range, but also has strong adaptability and robustness. Simulation and hardware-in-the-loop （HIL） experiments verify that the proposed resonance suppression method exhibits superior performance in high-penetration renewable energy grid-connected systems.

Key words

resonance suppression / mixed damping / high permeability / adaptive control / resonance transfer

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Wang Xiaohuan, Chen Xiheng, Min Fan, Zhao Xiaojun. RESEARCH ON HYBRID DAMPING ADAPTIVE RESONANCE SUPPRESSION METHOD FOR GRID CONNECTED INVERTERS CONSIDERING SHORT CIRCUIT RATIO[J]. Acta Energiae Solaris Sinica. 2025, 46(8): 585-595 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0495

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