MULTI-FUNCTIONAL PHOTOVOLTAIC GRID-CONNECTED INVERTER WITH ACTIVE DAMPER FUNCTION

Qu Aiwen; Gui Ren&#x02019;ao; Zhao Wenbo; Jiang Dongbo; Zhou Yangzhong

doi:10.19912/j.0254-0096.tynxb.2024-1280

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (11) : 350-362. DOI: 10.19912/j.0254-0096.tynxb.2024-1280

MULTI-FUNCTIONAL PHOTOVOLTAIC GRID-CONNECTED INVERTER WITH ACTIVE DAMPER FUNCTION

Qu Aiwen^1~3, Gui Ren’ao¹, Zhao Wenbo¹, Jiang Dongbo¹, Zhou Yangzhong^1~3

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Abstract

In order to improve the stability of the photovoltaic （PV） grid-connected multi-inverter parallel system with widely varying grid impedance, a multi-functional PV grid-connected inverter with active damper function based on energy-stored quasi-Z-source inverter is proposed, which simultaneously achieves grid-connected power generation and resonance suppression. Firstly, the circuit parameter design criteria for the multi-functional grid-connected inverter are presented. Then, an overall control strategy based on inverter side current feedback, considering the influence of the phase-locked loop （PLL）, and the corresponding control parameter design method are provided. In the control strategy, the phase margin of the original port impedance is increased to improve the system stability by employing phase lag compensation in the capacitor current feedback loop. Additionally, the virtual impedance satisfying the damping target resonance frequency band is constructed at the output end of the multi-functional inverter to achieve resonance suppression in the multi-inverter parallel system. Finally, the feasibility and effectiveness of the proposed multi-functional PV grid-connected inverter are verified through experiments.

Key words

PV power / inverters / system stability / resonance / multi-functional grid-connected inverter / active damper

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Qu Aiwen, Gui Ren’ao, Zhao Wenbo, Jiang Dongbo, Zhou Yangzhong. MULTI-FUNCTIONAL PHOTOVOLTAIC GRID-CONNECTED INVERTER WITH ACTIVE DAMPER FUNCTION[J]. Acta Energiae Solaris Sinica. 2025, 46(11): 350-362 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1280

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