RESEARCH ON ENERGY STORAGE SWITCHED BOOST PHOTOVOLTAIC GRID-CONNECTED INVERTER

Liu Shuo; Zhou Xu; Li Jianlin

doi:10.19912/j.0254-0096.tynxb.2021-0967

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (1) : 42-48. DOI: 10.19912/j.0254-0096.tynxb.2021-0967

RESEARCH ON ENERGY STORAGE SWITCHED BOOST PHOTOVOLTAIC GRID-CONNECTED INVERTER

Liu Shuo¹, Zhou Xu¹, Li Jianlin²

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Abstract

Taking photovoltaic power generation grid-connected system as the research object, this paper proposes a new type of energy storage switched boost grid-connected converter. By establishing a small signal model, the energy storage switched boost network in the system is analyzed. The energy storage switched boost network has the advantages of high gain and no dead zone. At the same time, the energy storage battery can be charged/discharged by controlling the through duty cycle. The system includes three power units： photovoltaic cells, energy storage switched boost network and grid-connected inverter. In order to maximize the use of photovoltaic cell energy, the disturbance observation method is used to track the maximum power point. At the same time, an energy management strategy is established to control the energy flow of the three power units, which improves the energy utilization rate and enhances the stability of the system. Simulations and experiments verify the superiority of the topology and the feasibility of the energy storage strategy.

Key words

maximum power point trackers / DC-DC converters / energy storage / grid-connected inverters / PV power generation

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Liu Shuo, Zhou Xu, Li Jianlin. RESEARCH ON ENERGY STORAGE SWITCHED BOOST PHOTOVOLTAIC GRID-CONNECTED INVERTER[J]. Acta Energiae Solaris Sinica. 2023, 44(1): 42-48 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0967

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