RESEARCH ON WIDE GAIN CONTROL STRATEGY OF ASYMMETRIC CLLC INTERLEAVED PARALLEL IN INTEGRATED PHOTOVOLTAIC STORAGE CHARGER

Pan Guobing; Zhang Haofei; Xia Songdi; Pang Qinghua; Zhou Yinghao

doi:10.19912/j.0254-0096.tynxb.2024-0359

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (7) : 177-185. DOI: 10.19912/j.0254-0096.tynxb.2024-0359

Special Topics of Academic Papers at the 44th Annual Meeting of the China Association for Science and Technology

RESEARCH ON WIDE GAIN CONTROL STRATEGY OF ASYMMETRIC CLLC INTERLEAVED PARALLEL IN INTEGRATED PHOTOVOLTAIC STORAGE CHARGER

Pan Guobing, Zhang Haofei, Xia Songdi, Pang Qinghua, Zhou Yinghao

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Abstract

The traditional photovoltaic storage charger widely used in the photovoltaic storage DC microgrid, the core part-bidirectional DC/DC is difficult to do at the same time to isolate and storage batteries need a wide range of voltage output. In this paper, a two-phase parallel asymmetric CLLC circuit topology and the associated control strategy are proposed, which adopts the control method of interleaved parallel and topology multiplexing to generate three modes of half-bridge, full-bridge, and full-bridge interleaved parallel to provide a wide voltage gain range, so that the converter operates near the above-resonant frequency point, and the three modes of operation achieve the zero-voltage turn-on of the primary-side switching tube. Aiming at the output power imbalance problem caused by the difference of actual resonance parameters in the full-bridge interleaved parallel mode, a method of compensating for the smaller gain phases, the phase-shift control method of increasing the secondary-side switching tubes is proposed. Through theoretical analysis and derivation of the corresponding gain formula, it is verified that the method can adjust the output gain and thus equalize the power. Finally, it is verified on the constructed 3.3 kW experimental platform that the converter can provide the voltage and power ranges required to satisfy the multi-stage charging of energy storage batteries, maintains the soft-switching in all the three modes, and achieves the power equalization in the full-bridge interleaved parallel mode.

Key words

bidirectional DC/DC / asymmetric CLLC / interleaved parallel / power equalization

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Pan Guobing, Zhang Haofei, Xia Songdi, Pang Qinghua, Zhou Yinghao. RESEARCH ON WIDE GAIN CONTROL STRATEGY OF ASYMMETRIC CLLC INTERLEAVED PARALLEL IN INTEGRATED PHOTOVOLTAIC STORAGE CHARGER[J]. Acta Energiae Solaris Sinica. 2025, 46(7): 177-185 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0359

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