Short-term optimal scheduling of cascade hydropower plants with reverse-regulating effects

Chengguo Su, Peilin Wang, Wenlin Yuan, Yang Wu, Feng Jiang, Zening Wu and Denghua Yan

Renewable Energy, 2022, vol. 199, issue C, 395-406

Abstract: The joint operation mode of large hydropower plants and their reverse-regulating plants has been widely used in China's major river basins. Hence this paper establishes an optimization model for the short-term optimal scheduling of cascade hydropower plants with reverse-regulating effects. Two conflicting objectives that need to be considered for optimal operation are minimizing the peak-valley difference of the power grid and minimizing the outflow variation of the reverse-regulating plant. The complex hydraulic coupling between the main-regulating plant and reverse-regulating plant is of particular concern. A novel two-layer nested approach, coupling constraint method and a mixed-integer linear programming (MILP) approach, is therefore proposed to solve the model. The results for three case studies demonstrate that: 1) The proposed approach is computationally efficient, and the average time for a single calculation is about 12 min; 2) The peak-valley difference of power grid G in dry season and flood season is reduced by 26.0% and 15.7%, respectively, after optimization. The outflow variation of the reverse-regulating plant has been controlled at 300 and 350 m3/s, respectively. 3) The developed model produces a more realistic and executable scheduling scheme than the benchmark model which does not consider the complex hydraulic coupling between cascade plants.

Keywords: Cascade hydropower plants; Complex hydraulic coupling; Reverse-regulating effects; Two-layer nested approach; Mixed-integer linear programming (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:199:y:2022:i:c:p:395-406

DOI: 10.1016/j.renene.2022.08.159

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