CAPACITOR CURRENT FEEDBACK ACTIVE DAMPING STRATEGY FOR LCL GRID CONNECTED INVERTER BASED ON SECOND-ORDER PHASE COMPENSATOR

Sun Biaoguang; Yang Zekun

doi:10.19912/j.0254-0096.tynxb.2023-0640

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (8) : 229-239. DOI: 10.19912/j.0254-0096.tynxb.2023-0640

CAPACITOR CURRENT FEEDBACK ACTIVE DAMPING STRATEGY FOR LCL GRID CONNECTED INVERTER BASED ON SECOND-ORDER PHASE COMPENSATOR

Sun Biaoguang^1,2, Yang Zekun^1,2

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Abstract

Under the influence of the control delay link, the grid-connected inverter system has the problem of too narrow effective damping region. In view of this, it is proposed to add a novel second-order phase overrun compensation link in the capacitive current feedback branch, and the effective damping boundary frequency of the capacitive current feedback active damping（CCFAD） is improved from f_s/6 to 0.34 f_s after the compensation. The parameter design method of the capacitive current feedback coefficients is optimised, and the closed-loop pole trajectories of the proposed control strategy are analysed in the discrete domain. Comparison and analysis with simulation and experimental results of existing strategies show that the proposed strategy has higher robustness under the operating conditions of increased grid impedance and wide range of filter parameter fluctuations.

Key words

delay / grid-connected inverter / compensation / parameter design / robustness

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Sun Biaoguang, Yang Zekun. CAPACITOR CURRENT FEEDBACK ACTIVE DAMPING STRATEGY FOR LCL GRID CONNECTED INVERTER BASED ON SECOND-ORDER PHASE COMPENSATOR[J]. Acta Energiae Solaris Sinica. 2024, 45(8): 229-239 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0640

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