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Influence of Parasitic Parameters on DC–DC Converters and Their Method of Suppression in High Frequency Link 35 kV PV Systems

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Listed:
  • Rui Li

    (School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Fangyuan Shi

    (School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Xu Cai

    (School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Haibo Xu

    (Dongguan South Semiconductor Technology Co., Ltd., Dongguan 523808, Guangdong, China)

Abstract

Photovoltaic (PV) power generation has shown a trend towards large-scale medium- or high-voltage integration in recent years. The development of high-frequency link PV systems is necessary for the further improvement of system efficiency and the reduction of system cost. In the system, high-frequency high-step-up ratio LLC converters are one of the most important parts. However, the parasitic parameters of devices lead to a loss of zero-voltage switching (ZVS) in the LLC converter, greatly reducing the efficiency of the system, especially in such a high-frequency application. In this paper, a high-frequency link 35 kV PV system is presented. To suppress the influences of parasitic parameters in the LLC converter in the 35 kV PV system, the influence of parasitic parameters on ZVS is analyzed and expounded. Then, a suppression method is proposed to promote the realization of ZVS. This method adds a saturable inductor on the secondary side to achieve ZVS. The saturable inductor can effectively prevent the parasitic elements of the secondary side from participating in the resonance of the primary side. The experimental results show that this method achieves a higher efficiency than the traditional method by reducing the magnetic inductance.

Suggested Citation

  • Rui Li & Fangyuan Shi & Xu Cai & Haibo Xu, 2019. "Influence of Parasitic Parameters on DC–DC Converters and Their Method of Suppression in High Frequency Link 35 kV PV Systems," Energies, MDPI, vol. 12(19), pages 1-24, September.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:19:p:3743-:d:272357
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    References listed on IDEAS

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    1. Efrén Fernández & Alejandro Paredes & Vicent Sala & Luis Romeral, 2018. "A Simple Method for Reducing THD and Improving the Efficiency in CSI Topology Based on SiC Power Devices," Energies, MDPI, vol. 11(10), pages 1-23, October.
    2. Fan Xie & Zhenxiong Luo & Dongyuan Qiu & Bo Zhang & Yanfeng Chen & Liying Huang, 2019. "Study on a Simplified Structure of a Two-Stage Grid-Connected Photovoltaic System for Parameter Design Optimization," Energies, MDPI, vol. 12(11), pages 1-16, June.
    3. Amirreza Naderipour & Zulkurnain Abdul-Malek & Mohammad Reza Miveh & Mohammad Jafar Hadidian Moghaddam & Akhtar Kalam & Foad. H. Gandoman, 2018. "A Harmonic Compensation Strategy in a Grid-Connected Photovoltaic System Using Zero-Sequence Control," Energies, MDPI, vol. 11(10), pages 1-18, October.
    4. Wilfried van Sark, 2019. "Photovoltaic System Design and Performance," Energies, MDPI, vol. 12(10), pages 1-6, May.
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