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Analysis of the Day-ahead Deviation Plan and Research on the Real-time Scheduling of Photovoltaic Greenhouses Based on Exergy Theory

Author

Listed:
  • Xiayun Duan

    (College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China)

  • Yifeng Ding

    (Electric Power Research Institute, State Grid Beijing Electric Power Company, Beijing 100075, China)

  • Huanna Niu

    (College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China)

  • Yuzhu Wang

    (College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China)

Abstract

For the correction problem of day-ahead plan deviation caused by energy prediction deviation in day-ahead scheduling stage of photovoltaic greenhouses, an exergy analysis method is used to propose the deviation model of heat required for photovoltaic greenhouses. Based on the deviation model, a real-time optimization scheduling model is established. The deviation model not only considers the non-negligible exergy loss during heating process of pipes, but also considers the difference between heat and thermal exergy affected by the actual indoor temperature. The goal of the real-time scheduling model is to minimize the absolute value of the difference between the energy supply and demand prediction deviation to be corrected and the adjustment of multi-form energy storage and electric loads, so that develop the real-time adjustment plan of energy storage and electric loads. The analysis results of the actual photovoltaic greenhouse show that of the heat required by a greenhouse based on the exergy theory calculation, the exergy loss of the heating process accounts for about 10%–20% of the total thermal exergy required and it cannot be ignored, so the calculation results can reflect the actual heat required more accurately and the greenhouse temperature is more suitable for plant growth. Moreover, the proposed real-time scheduling model can correct the deviation of the day-ahead plan and improve local consumption. The promotion ratio can reach 7%. Finally, the farmers’ electricity purchases cost is reduced. Thereby the effectiveness of the proposed heat deviation model and real-time scheduling model is verified.

Suggested Citation

  • Xiayun Duan & Yifeng Ding & Huanna Niu & Yuzhu Wang, 2019. "Analysis of the Day-ahead Deviation Plan and Research on the Real-time Scheduling of Photovoltaic Greenhouses Based on Exergy Theory," Energies, MDPI, vol. 12(20), pages 1-21, October.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:20:p:3849-:d:275437
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    References listed on IDEAS

    as
    1. Yuzhu Wang & Huanna Niu & Lu Yang & Weizhou Wang & Fuchao Liu, 2018. "An Optimization Method for Local Consumption of Photovoltaic Power in a Facility Agriculture Micro Energy Network," Energies, MDPI, vol. 11(6), pages 1-20, June.
    2. Ishaq, H. & Dincer, I., 2019. "Exergy analysis and performance evaluation of a newly developed integrated energy system for quenchable generation," Energy, Elsevier, vol. 179(C), pages 1191-1204.
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