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Short-term load distribution model for cascade giant hydropower stations with complex hydraulic and electrical connections

Author

Listed:
  • Wu, Yuqiang
  • Liao, Shengli
  • Liu, Benxi
  • Cheng, Chuntian
  • Zhao, Hongye
  • Fang, Zhou
  • Lu, Jia

Abstract

The cascade giant hydropower station system (CGHSS) has been widely applied in countries with abundant water resources. However, the dense hydropower stations and power grids bring complex hydraulic and power connections, including the backwater effect, multiple hydroplants sharing one reservoir and one-reservoir multiple dispatch power grid, which leads to modelling difficulties and inefficient model solving. To address these challenges, a short-term load distribution (SLD) model considering complicated hydraulic and electricity constraints is developed. First, the discharge of each hydroplant and the downstream forebay water level are used as inputs to construct a multivariate nonlinear function, and the average tailwater levels are obtained. Second, a head constraint considering the shared water level is added to the model to calculate the head of each hydroplant, making the output more accurate. Finally, the nonlinear constraints are linearly reconstructed using the Big-M method, triangulation technique and special ordered sets to reduce the model solution time. The SLD model is applied to the Xiluodu-Xiangjiaba cascade hydropower system in the Jinsha River. The results show that the developed model reduces water consumption by 4.02 %, 4.70 %, 5.79 % and 5.28 % compared to the constant proportional distribution model and the real operation, generating a more executable SLD scheme.

Suggested Citation

  • Wu, Yuqiang & Liao, Shengli & Liu, Benxi & Cheng, Chuntian & Zhao, Hongye & Fang, Zhou & Lu, Jia, 2024. "Short-term load distribution model for cascade giant hydropower stations with complex hydraulic and electrical connections," Renewable Energy, Elsevier, vol. 232(C).
    • Handle: RePEc:eee:renene:v:232:y:2024:i:c:s0960148124011352
    DOI: 10.1016/j.renene.2024.121067
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