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      Operational benefit of transforming cascade hydropower stations into pumped hydro energy storage systems

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      Author(s)
      Toufani, Parinaz
      Nadar, Emre
      Kocaman, Ayse Selin
      Date
      2022-07
      Source Title
      Journal of Energy Storage
      Print ISSN
      2352-152X
      Electronic ISSN
      2352-1538
      Publisher
      Elsevier
      Volume
      51
      Pages
      104444-1 - 104444-11
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      This study evaluates the potential benefit of retrofitting existing conventional cascade hydropower stations (CCHSs) with reversible turbines so as to operate them as pumped hydro energy storage (PHES) systems. We examine the energy generation and storage problem for a CCHS with two connected reservoirs that can be transformed into a PHES system in a market setting where the electricity price can be negative. We formulate this problem as a stochastic dynamic program (SDP) under uncertainty in the streamflow rate and electricity price. We analytically derive an upper bound on the profit improvement that can be obtained from the PHES transformation. We conduct numerical experiments with data-calibrated time series models and observe that the PHES system provides a greater benefit under more limited streamflow conditions or more frequently observed negative prices.
      Keywords
      Cascade hydropower stations
      Negative electricity prices
      Pumped hydro energy storage
      Stochastic dynamic program
      Streamflow rate
      Permalink
      http://hdl.handle.net/11693/111672
      Published Version (Please cite this version)
      https://doi.org/10.1016/j.est.2022.104444
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