Abstract
In China, there are numerous single-reservoir and multicascade hydropower plants (SMHPs), which provide high-quality peak-shaving power supply due to their characteristics of rapid load tracking and flexible regulation. However, the short-term peak-shaving operation (SPSO) of SMHPs serving multiple power grids faces difficulties from complicated hydraulic and electrical connections, dimensional disasters and complex solution difficulties. To effectively address the above problems, this paper presents a new method combining a typical peak-shaving output curve and a spillage adjustment strategy for the SPSO of SMHPs. First, the typical peak-shaving output curves of SMHPs are determined by the fuzzy membership function, flat-to-peak ratio and valley-to-peak ratio to reduce the dimension of SPSO. The fuzzy membership function is applied to identify the peak, flat and valley periods of multigrid loads. Then, taking the maximum total final energy storage of the scheduling period as the objective function, an SPSO model of SMHPs serving multiple power grids is established to balance the energy storage and peak-shaving requirements. Energy storage refers to the maximum hydropower generation that a hydropower plant can theoretically produce under a certain storage state. Finally, a spillage adjustment strategy is adopted to modify the power outputs of the SMHPs to minimize water spillage. The results from a real-world hydropower system in China demonstrate that the proposed method can allow SMHPs to play an important role in peak shaving while obtaining relatively high energy storage with negligible water spillage.
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The data used to support this study are available from the corresponding author upon reasonable request.
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Acknowledgements
This research was supported by National Natural Science Foundation of China (No. U1765103, No. 51979023) and the Fundamental Research Funds for the Central Universities (No. DUT20JC16).
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All authors contributed to the study conception and design. Data collection and analysis were performed by S.L. Liao, Y. Zhang, J. Liu, B.X. Liu, Z.W. Liu. This revision version of the manuscript was written by Y. Zhang, and reviewed by S.L. Liao. All authors read and approved the final manuscript.
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Liao, S., Zhang, Y., Liu, J. et al. Short-Term Peak-Shaving Operation of Single-Reservoir and Multicascade Hydropower Plants Serving Multiple Power Grids. Water Resour Manage 35, 689–705 (2021). https://doi.org/10.1007/s11269-020-02751-w
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DOI: https://doi.org/10.1007/s11269-020-02751-w