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Study on a Simplified Structure of a Two-Stage Grid-Connected Photovoltaic System for Parameter Design Optimization

Author

Listed:
  • Fan Xie

    (School of Electric Power, South China University of Technology, Guangzhou 510641, China)

  • Zhenxiong Luo

    (School of Electric Power, South China University of Technology, Guangzhou 510641, China)

  • Dongyuan Qiu

    (School of Electric Power, South China University of Technology, Guangzhou 510641, China)

  • Bo Zhang

    (School of Electric Power, South China University of Technology, Guangzhou 510641, China)

  • Yanfeng Chen

    (School of Electric Power, South China University of Technology, Guangzhou 510641, China)

  • Liying Huang

    (School of Electric Power, South China University of Technology, Guangzhou 510641, China)

Abstract

Conventional parameter designs of two-stage grid-connected photovoltaic (PV) system relied on its mathematical model of the cascade structure (CS), but the procedure is excessively cumbersome to implement. Besides, for a two-stage converter system, the coupling interaction between the power converters can directly lead to a poor parameter design. To overcome this drawback, this paper uses a simplified structure (SS) of single-phase two-stage grid-connected PV system to better design the parameters of the front-stage dc-dc converter. After establishing the small-signal model for SS and CS in the PV system, the relative eigenvalue sensitivity is used as the criterion for judging the influence of some parameters on the stability of the two structures. The stable boundary of MPPT control parameters is compared and discussed in SS and CS, respectively. In addition, the relationship between the front-stage dc-dc converter and the rear-stage dc-ac inverter is analyzed by the modal participation factor calculated in CS. An experiment is also performed at the end of this paper to further verify the feasibility of using SS to design the parameters of the dc-dc converter in the PV system.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:11:p:2193-:d:238352
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    References listed on IDEAS

    as
    1. Pandey, A.K. & Tyagi, V.V. & Selvaraj, Jeyraj A/L & Rahim, N.A. & Tyagi, S.K., 2016. "Recent advances in solar photovoltaic systems for emerging trends and advanced applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 859-884.
    2. Liying Huang & Dongyuan Qiu & Fan Xie & Yanfeng Chen & Bo Zhang, 2017. "Modeling and Stability Analysis of a Single-Phase Two-Stage Grid-Connected Photovoltaic System," Energies, MDPI, vol. 10(12), pages 1-14, December.
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    Cited by:

    1. 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.

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