RESEARCH ON FREQUENCY ADAPTIVE PR CONTROL STRATEGY OF F-TYPE THREE-LEVEL GRID-CONNECTED INVERTER

Wu Tingting; Liu Jingwen; Hu Chunxuan; Jiang Qi; Wang Huan; Wang Jianyuan

doi:10.19912/j.0254-0096.tynxb.2024-2135

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (4) : 31-37. DOI: 10.19912/j.0254-0096.tynxb.2024-2135

RESEARCH ON FREQUENCY ADAPTIVE PR CONTROL STRATEGY OF F-TYPE THREE-LEVEL GRID-CONNECTED INVERTER

Wu Tingting¹, Liu Jingwen², Hu Chunxuan², Jiang Qi², Wang Huan³, Wang Jianyuan³

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Abstract

This study addresses the limitations of traditional three-level inverters, including high costs and significant power losses, particularly their elevated grid-connected current harmonic content under unbalanced grid voltages and frequency fluctuations. A frequency-adaptive proportional resonant（PR） control strategy is proposed for Type-F three-level grid-connected inverters. Experimental verification on the Type-F three-level inverter platform demonstrates that, compared with conventional quasi-PR control, the frequency-adaptive PR strategy significantly reduces the total harmonic distortion （THD） of grid-connected currents. Specifically, THD decreases by 0.35% and 0.45% under grid voltage imbalance and frequency fluctuation conditions, respectively. These results validate the effectiveness and superiority of the proposed control strategy in enhancing grid-connected power quality.

Key words

grid-connected inverters / total harmonic distortion rate / proportional resonance control / non-ideal grid / frequency-adaptive / grid-connected power quality

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Wu Tingting, Liu Jingwen, Hu Chunxuan, Jiang Qi, Wang Huan, Wang Jianyuan. RESEARCH ON FREQUENCY ADAPTIVE PR CONTROL STRATEGY OF F-TYPE THREE-LEVEL GRID-CONNECTED INVERTER[J]. Acta Energiae Solaris Sinica. 2026, 47(4): 31-37 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2135

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