Abstract

Under the weak grid, photovoltaic grid-connected inverter generates a lot of harmonics in the process of inverter, and the stable operation of system is affected by the inherent resonance phenomenon when LCL filter is used for filtering. In this paper, the traditional grid-connected current feedback(TGCCF) control method is firstly studied. At this time, the inherent resonance phenomenon is not effectively suppressed. Furthermore, a control method of inverter-current-feedback active damping (ICFAD) is proposed to effectively suppress the resonance. As there is only one current control, the inhibition effect needs to be improved. Based on this, a control method of inverter-and-capacitor-current-feedback active damping (IACCFAD) is proposed. It is beneficial to enhance the resonance suppression effect, improve robustness and stability of the inverter system, and improve current quality. The correctness of the above conclusions is verified by simulation.

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