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Flexibility assessment of a hybrid power system: Hydroelectric units in balancing the injection of wind power

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  • Zhang, Jingjing
  • Li, Huanhuan
  • Chen, Diyi
  • Xu, Beibei
  • Mahmud, Md Apel

Abstract

With the increasing scale of wind energy being connected to the power grid, the system flexibility shows an increasingly important role in maintaining the power balance. This trend indicates that it requires a clearer understanding of how the flexibility resource provided by hydroelectric units affects the flexibility performance. It is a challenge for the flexibility assessment as one of the major reasons for the accurate quantification involves the randomness, volatility, and intermittency of wind power injected into the grid. To address this challenge, a mathematical model of a wind-hydro hybrid power system (WHHPS) is developed and verified. The flexibility indices, namely, the probability and expectation of upward/downward flexibility not supplied, are defined. Finally, the flexibility properties of different reserve ratios and line distances are quantitatively analyzed. One of the main results shows that both the upward and downward flexibility are improved with the reserve ratio increasing regardless of changes in wind speed types. The proposed methods and results provide a visualized reference for the dispatching department to evaluate the required flexibility for improving the utilization rate of wind energy.

Suggested Citation

  • Zhang, Jingjing & Li, Huanhuan & Chen, Diyi & Xu, Beibei & Mahmud, Md Apel, 2021. "Flexibility assessment of a hybrid power system: Hydroelectric units in balancing the injection of wind power," Renewable Energy, Elsevier, vol. 171(C), pages 1313-1326.
    • Handle: RePEc:eee:renene:v:171:y:2021:i:c:p:1313-1326
    DOI: 10.1016/j.renene.2021.02.122
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    References listed on IDEAS

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    2. Chaoyang Chen & Hualing Liu & Yong Xiao & Fagen Zhu & Li Ding & Fuwen Yang, 2022. "Power Generation Scheduling for a Hydro-Wind-Solar Hybrid System: A Systematic Survey and Prospect," Energies, MDPI, vol. 15(22), pages 1-31, November.
    3. Han, Shuo & He, Mengjiao & Zhao, Ziwen & Chen, Diyi & Xu, Beibei & Jurasz, Jakub & Liu, Fusheng & Zheng, Hongxi, 2023. "Overcoming the uncertainty and volatility of wind power: Day-ahead scheduling of hydro-wind hybrid power generation system by coordinating power regulation and frequency response flexibility," Applied Energy, Elsevier, vol. 333(C).
    4. Yaser Bostani & Saeid Jalilzadeh & Saleh Mobayen & Thaned Rojsiraphisal & Andrzej Bartoszewicz, 2022. "Damping of Subsynchronous Resonance in Utility DFIG-Based Wind Farms Using Wide-Area Fuzzy Control Approach," Energies, MDPI, vol. 15(5), pages 1-15, February.

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