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

Date
2022-07
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Source Title
Journal of Energy Storage
Print ISSN
2352-152X
Electronic ISSN
2352-1538
Publisher
Elsevier
Volume
51
Issue
Pages
104444-1 - 104444-11
Language
English
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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.

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