MPPT RIPPLE SUPPRESSION METHOD FOR PHOTOVOLTAIC-STORAGE DC/DC CONVERTER UNDER INVERTER LOAD

Liu Baoquan; Zhang Haoming; Li Haoxuan; Han Meng

doi:10.19912/j.0254-0096.tynxb.2023-1874

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (3) : 384-393. DOI: 10.19912/j.0254-0096.tynxb.2023-1874

MPPT RIPPLE SUPPRESSION METHOD FOR PHOTOVOLTAIC-STORAGE DC/DC CONVERTER UNDER INVERTER LOAD

Liu Baoquan, Zhang Haoming, Li Haoxuan, Han Meng

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Abstract

This paper introduces a novel control method to address maximum power point tracking （MPPT） ripple in photovoltaic-storage DC/DC converter under inverter load. The double-line frequency of the battery voltage pulsation and the resulting dynamic mode switching of system is the main cause of MPPT ripple. Firstly, the effect of battery’s equivalent parameters under inverter load on DC bus voltage pulsation is analysed based on the Thevenin equivalent model, and a back gain model incorporating the battery’s equivalent parameters of DC/DC converter is established. Additionally, a feedforward method is proposed for suppressing bus voltage pulsation. Furthermore, an analysis is conducted to identify the causes of dynamic mode switching induced by inverter loads based on the relationship between MPPT charging mode and constant voltage-constant current charging mode. A load identification algorithm is proposed to avoid dynamic mode switching, by using a time window to detect bus voltage pulsation as an additional loop switching criterion. Finally, simulation and experimental results show that the proposed combined method can effectively reduce MPPT ripple in the photovoltaic-storage DC/DC converter under inverter load.

Key words

photovoltaic-storage system / DC/DC converter / maximum power point tracking （MPPT） / photovoltaic voltage fluctuation / dynamic mode switching

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Liu Baoquan, Zhang Haoming, Li Haoxuan, Han Meng. MPPT RIPPLE SUPPRESSION METHOD FOR PHOTOVOLTAIC-STORAGE DC/DC CONVERTER UNDER INVERTER LOAD[J]. Acta Energiae Solaris Sinica. 2025, 46(3): 384-393 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1874

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