MAGNETIC INTEGRATED INTERLACING PARALLEL LCL HIGH GAIN CONVERTER

Li Hongzhu; Yuan Fengrui

doi:10.19912/j.0254-0096.tynxb.2021-0433

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (10) : 29-36. DOI: 10.19912/j.0254-0096.tynxb.2021-0433

MAGNETIC INTEGRATED INTERLACING PARALLEL LCL HIGH GAIN CONVERTER

Li Hongzhu, Yuan Fengrui

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Abstract

Aiming at the demand of high-gain DC-DC converter in photovoltaic grid-connected, a magnetically integrated interlaced parallel high-gain converter is proposed, based on coupled inductance doubling unit. All inductors are magnetically integrated and the voltage gain is improved by changing the turn ratio of doubling unit N. The expressions of voltage gain, voltage stress of switching tube and diode, transient and steady-state equivalent inductance are derived. Theoretical analysis shows that the converter has higher gain, the voltage gain is （N+1）/2 times that of the traditional interleaving switched inductance capacitance converter. After inductors being integrated with the optimal coupling degree, the steady-state current ripple decreases and the transient response speed increases about 2.5 times. An experimental prototype with a power of 100 W is built, and the theoretical analysis is verified by prototype test. It is proved that the magnetic integrated converter has better electrical performance than that of the traditional converter.

Key words

photovoltaic power / grid-connected / DC converter / voltage gain / magnetic integration

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Li Hongzhu, Yuan Fengrui. MAGNETIC INTEGRATED INTERLACING PARALLEL LCL HIGH GAIN CONVERTER[J]. Acta Energiae Solaris Sinica. 2022, 43(10): 29-36 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0433

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