Photovoltaic Energy Storage System Based on Bidirectional LLC Resonant Converter Control Technology

Di Xie, Liangliang Wang (), Zhi Zhang, Shoumo Wang, Longyun Kang and Jigang Yao
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Di Xie: New Energy Research Center, School of Electric Power, South China University of Technology, Guangzhou 510640, China
Liangliang Wang: Guangdong HYNN Technologies Co., Ltd., Dongguan 523808, China
Zhi Zhang: Department of Electrical Engineering and Automation, Dongguan University of Technology, Dongguan 523808, China
Shoumo Wang: Guangdong HYNN Technologies Co., Ltd., Dongguan 523808, China
Longyun Kang: New Energy Research Center, School of Electric Power, South China University of Technology, Guangzhou 510640, China
Jigang Yao: Guangdong HYNN Technologies Co., Ltd., Dongguan 523808, China

Energies, 2022, vol. 15, issue 17, 1-18

Abstract: Bidirectional DC/DC converters are widely adopted in new energy power generation systems. Because of the low conversion efficiency and non-isolation for conventional, bidirectional DC/DC converters in the photovoltaic energy storage complementary system, this paper proposes a bidirectional isolation LLC converter topology, with compensating inductance for the energy storage system; it has excellent characteristics, such as wide input voltage range and soft switching in full-load range. First, an AC equivalent model based on the fundamental wave equivalent method is established to derive the voltage gain. Meanwhile, a small signal model is also built to design a reasonably closed-looped controller. Finally, the improved bidirectional LLC resonant converter is applied to the photovoltaic energy storage complementary system. The correctness and feasibility for the bidirectional LLC converter topology under the proposed charging and discharging control strategy of the DC bus are verified by simulation and experimental results.

Keywords: photovoltaic; energy storage; LLC; bidirectional DC/DC converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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