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Study on Operating Strategy of Electric–Gas Combined System Considering the Improvement of Dispatchability

Author

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  • Wei Zhang

    (Department of Electrical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)

  • Ruoyao Liu

    (Department of Electrical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)

  • Xinyu Yang

    (Department of Electrical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)

Abstract

The uncertainty of distributed energy (DG) and load in the electric–gas combined system (EGCS) requires EGCS to have higher dispatching capacity. A novel strategy is introduced in this paper to operate EGCS considering dispatchability evaluation indexes in order to improve the dispatchability of EGCS. Firstly, the paper describes the physical architecture of EGCS and its main devices. Based on the typical structure of EGCS, the main coupling modes between the two networks are analyzed and summarized, and a power flow model of deep coupling EGCS is established. Then, it proposes a unified quantitative modeling method of dispatchability, and qualitatively analyzes the dispatchability capability of different types of resources in the system through the definition, connotation, and multi-dimensional attributes of EGCS dispatchability. In order to characterize the strength of the overall dispatchability of EGCS, two evaluation indexes, upward/downward dispatchability margin, are proposed. The case study validates the applicability of the proposed dispatchability indexes through simulation. The uncertainties existing in various sources, namely networks and loads of EGCS, the output power of wind farms, and photovoltaic plants, are analyzed emphatically through actual data of a certain area. The EGCS economic dispatching model is established by considering the DG output prediction errors, introducing the expected penalty term of insufficient dispatchability into the objective function, and calculating the dispatchability margin through the simulation model to quantitatively analyze the dispatchability capability of the system.

Suggested Citation

  • Wei Zhang & Ruoyao Liu & Xinyu Yang, 2019. "Study on Operating Strategy of Electric–Gas Combined System Considering the Improvement of Dispatchability," Energies, MDPI, vol. 12(23), pages 1-24, December.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:23:p:4584-:d:293173
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    References listed on IDEAS

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    Cited by:

    1. Jiandong Duan & Fan Liu & Yao Yang & Zhuanting Jin, 2021. "Flexible Dispatch for Integrated Power and Gas Systems Considering Power-to-Gas and Demand Response," Energies, MDPI, vol. 14(17), pages 1-26, September.

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